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Published: September 04, 2010
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Article type: Appendix
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Article type: Appendix
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Published: September 04, 2010
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Article type: Appendix
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Published: September 04, 2010
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Article type: Index
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A1-A6
Published: September 04, 2010
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Teruaki ITO, Masato NISHIMOTO
Article type: Article
Session ID: S1201-1-1
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Tariq Mohammad Arif, Teruaki Ito
Article type: Article
Session ID: S1201-1-2
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Yasufumi SHISHIKURA, Mituru JINDAI, Tomio WATANABE
Article type: Article
Session ID: S1201-1-3
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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In this study, we analyzed handshake motions and gaze presentations in handshake between humans, and proposed a handshake request motion model based on the analysis. Furthermore, a handshake robot system which adopts the proposed model was developed for the generation of a handshake request motion from a robot to a human. Using the handshake robot system, a sensory evaluation was performed in order to analyze timing of voice greetings and gaze presentations in handshake motions. From the experimental results, the voice greeting which starts earlier than the hand movement and the gaze presentation shifting from the hand to the head are preferred by humans in handshake between a human and a robot.
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Hiroyuki Nagai, Ryusei Danbara, Michiya Yamamoto, Tomio Watanabe
Article type: Article
Session ID: S1201-1-4
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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A lecturer and audiences share embodied rhythms in presentation. By focusing on entrainment in face-to-face communication, the authors have already developed the speech-driven embodied CG character InterActor with both functions of speaker and listener. In this paper, an embodied presentation system with speech-driven InterActor characters and nodding objects pointed by a lecture is developed. A lecturer can specify texts, logotypes, symbols, graphs in any slides made by PowerPoint as nodding objects and can arrange characters to an arbitrary place of the slide. The effectiveness of this system for presentation support is demonstrated by a sensory evaluation experiment conducted in an actual presentation scenario.
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Go NAITO, Takabumi WATANABE, Yoshiyuki MIWA
Article type: Article
Session ID: S1201-2-1
Published: September 04, 2010
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In the activity of the bodily expression called "Hand Contact Improvisation", it is known to be generated a sense of Sympathetic Body Awareness as a relation with each other deepens gradually through exchanging entire body information of self and others through palms. Then, we aim to develop the remotely-Hand Contact Improvisation system, and focused on the force at the palm which touches each other directly. And so, the system of feree display was developed. This system can display arbitrary force and position independently onto user's palm. Sufficient performance of the system was confirmed by result of the operation test, and we receive vision of displaying forces for the Hand Contact Improvisation.
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Yoshiyuki MIWA, Shiroh ITAI, Kosuke NISHIJIMA, Takahiro KATO, Yosifumi ...
Article type: Article
Session ID: S1201-2-2
Published: September 04, 2010
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This paper proposes a new avatar for generating non-separable relationship between your own body in the real space and your avatar in the virtual space, and changing your body sensation. This avatar ("Shadow Avatar") has two exclusive properties. One is that Shadow Avatar has some redundant degree of freedoms. And these freedoms generate the gap between your body motion and your Shadow Avatar motion. The other is that Shadow Avatar is projected with your body shadow and your Shadow Avatar superimposed. From the results, it was indicated that the body shadow is effective to support the generation of non-separable relationship between body and shadow avatar. Furthermore, experimental results indicate the possibility that this method using Shadow Avatar is effective to support for changing the body sensation and generating the body expression.
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Tomoyuki FUKAI, Koji IIDA, Akihiro KAWAI, Yoshiyuki MIWA
Article type: Article
Session ID: S1201-2-3
Published: September 04, 2010
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Until now, we have revealed that shadow media system that transforms shadow that is inseparable from human body can support generation of body expression. In this research, for using this system for expression activity in a group of about 20 in education, we developed new system that can set and transport easily and support space of field flexibly. This system can enlarge projection range three times for acquisition device that obtain three formed images continuously and three projection devices that set up two projectors projecting shadow image to screen and floor. Furthermore, auto calibration can set this system speedy. As a result, we confirmed that this system can use in education.
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Yoshihiro Sejima, Yutaka Ishii, Tomio Watanabe
Article type: Article
Session ID: S1201-2-4
Published: September 04, 2010
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We have developed an embodied virtual communication system called EVCOS for human interaction analysis by synthesis. In this paper, focusing on the speech-overlap in enhanced interaction, the characteristics are analyzed in the virtual face-to-face communication using EVCOS, and a model estimating conversational activity on the basis of the analysis is proposed. In addition, an enhanced interaction support system is developed by applying the proposed model to an interactive wall as a virtual audience.
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Tadashi NAGAKUBO
Article type: Article
Session ID: S1108-1-1
Published: September 04, 2010
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This study is on removal of the work affected zone formed by laser texturing. For removal of the work affected zone some methods were tried, which of anodic-treatment, derusting agents and acid wash agents with buffing used commonly. Anodic-treatment could remove almost work affected zone and increase in the dimple volume. But pitting corrosion occurred with removal process at 2000 mV vs. SCE. In addition, friction test (vs. alumina ball) was carried out using specimens with buffing or anodic-treatment. There is a difference in frictional behavior due to the change in the dimple shape.
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Makoto KUSAKABEA, Kouitsu MIYACHIKA
Article type: Article
Session ID: S1108-1-2
Published: September 04, 2010
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This paper presents a study on hardened layer and bending fatigue strength of induction-hardened gears. The measurement of hardened layer and the bending fatigue test were carried out for induction hardened gears made of thermally refined and normalized S35C and S45C steels, and then the surface hardness, the hardened depth, the macro- and micro-structure of hardened layer and S-N curves were obtained. Effects of the material and the tempering on the bending fatigue strength of induction hardened gears were examined.
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Jun MISAWA, shoji NOGUCHI
Article type: Article
Session ID: S1108-1-3
Published: September 04, 2010
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Now, the most of lubrication methods of the bearing is grease one. However, the grease cannot participate in lubrication when scattered in a bearing so that fluidity is small in comparison with the lubricating oil. In addition, there is the performance investigation example of grease in itself to date, but there are few date about the behavior. Then, in the present study, I produce the experimental device and can observe behavior of the grease in the bearing. I put below a result. I grasped a tendency of the scattering of the grease and correlation with the temperature of the inner ring of bearing.
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Atsushi KAKIHARA
Article type: Article
Session ID: S1108-1-4
Published: September 04, 2010
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In the cutting of Ni-base superalloys with a sintered carbide tool, a built-up edge (BUE) is readily formed at a cutting edge ofa tool. Generally, formation of a BUE has been known as one of the problems for cutting. In particular, chipping accompanied with detachment of the BUE is a serious problem. However, the BUE brings certain advantage to the tool life if the steady BUE settles into the tool edge and acts as a tool edge instead. In this study, cutting experiments by using the tool with chamfered edge were carried out for Inconel 718. From the experimental results, it is found that the stable BUE can restrain tool wear on the rake face and this effect depends on tool geometry. It is suggested that this reduction in wear amount is brought about by effect of restricting tool-chip contact length.
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Ken OTA
Article type: Article
Session ID: S1108-1-5
Published: September 04, 2010
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The inorganic system glass coating film was developed as a painting protection film for the car. The glass film adds hydrophile and the resistance to ultraviolet rays to various materials. However, the functional evaluation of the glass film is difficult because the film thickness is about 20 nm. I tried the reflectivity measurement of existence and a characteristic of the glass film by the spectrophotometer. The glass film's reflectance has changed by the uv in about 10%. The glass film is expected that there is a characteristic of reflecting and scattering for the uv. In addition, I investigated the mechanism of coating the glass film. I made the electroplating system. I found the reflectivity change that the electroplating film is similar to the glass film. So, I found that boric acid silica has the electric-charge of the plus and the glass film is coated by the principle of electroplating.
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Naoki SAEKI
Article type: Article
Session ID: S1108-1-6
Published: September 04, 2010
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The present study describes a relationship between introduced pre-crack and crack growth due to breaking process of brittle materials. The pre-crack was introduced with the indentation fracture technique and had grown by the application of bending stress with flexural test. The material used in the study was glass and the various indenters, such as Vickers and Knoop were used for introducing pre-cracks. The breaking process was examined with an electro mechanical testing apparatus at a constant cross head speed under 3-point bending set up. Results showed that the pre-crack resulted from multiple impressions with smaller applied load was effective to obtain a flat fracture surface.
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Masahiro MUTO, Keiichi WATANUKI
Article type: Article
Session ID: S1108-2-1
Published: September 04, 2010
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This paper describes education system using augmented reality technology. The system aims to offer useful information for the learner, to support intuitive study, and to improve the efficiency of the in-depth understanding and study. For the purpose the system that synthesizes information that seems to improve study to the image of the reality on real time was developed using augmented reality technology to mechatronics training, and study. Effects of the system were verified by the testee's using the system and being evaluated. It was confirmed that an educational system using the augmented reality technology was effective in intuitive study by the verification outcome.
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Kazuya FUNAYAMA, Eiichirou TANAKA
Article type: Article
Session ID: S1108-2-2
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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An apparatus to assist elderly patients to stand up, as well as leaning forward the upper body, has been developed. The mechanism of the apparatus enables to shift the person's center of gravity along an adequate trajectory during the standing up process, so as not to cause strain on the joints of the user's leg. The apparatus also assists a person to alter from a standing or sitting posture to lying posture. Although the mechanism has multiple links and joints, only one actuator is required to transform the apparatus between aforementioned three postures. The length of each link of the mechanism has been determined from their effect on the backrest angle when each link in the mechanism length is changed. The torque of the hip and knee joints while using the apparatus can be calculated and compared with the data of a user not using the apparatus. We hypothesize that the output torque of the user while standing is decreased by using the apparatus.Mechanical Design
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Satoshi KANEKO, Hiromu HASHIMOTO
Article type: Article
Session ID: S1108-2-3
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Thin and flexible continuous medium is called Web. The Web is used in many products such as paper or high-tech films. In addition, Web-based solar cells in environmental and energy field have been actively developing. Therefore, the Web is required to improve productivity because demand is anticipated to expand further. The Web is taken up in final roll supported by many rollers, is transferred. The wound roll defects such as slippage or wrinkling occur in the process such as keeping and shipping and cause major economic losses, because the wound roll is affected by temperature environments. It is known that internal stress state depend on the roll defects, therefore, accurate measurement and calculation of internal stress under various temperature conditions in wound roll are required. In this study, we compared the measurements with the analysis in wound roll internal stress under various temperate changes. As a result, theoretical results show good agreement with the measured data.
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Yuuki TOKUTA, Shinya SASAKI, Masahiro KAWAGUCHI, Aya SHIMIZU
Article type: Article
Session ID: S1108-2-4
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Diamond-like carbon (DLC) films are expected to use in various applications such as cutting tool, steel mold, general machinery elements. On the other hands, there are some practical subjects for DLC films. Particularly, such as heat proof, deregulation of residual stress and improvement of adherence are focused on in general. In this study, we focused on the heat proof to utilize the DLC films which the surface becomes high temperature. Ball on disk tester and micro laser Raman spectroscopy are employed to research the effects of applied heat and sliding on structure changes on the DLC films. In this study, ball on disk test after heating at 300℃. 350℃, 400℃ are accomplished. Then, the structure changes of the DLC films are analyzed by micro laser Raman spectroscopy.
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Hidenori NAGAHAMA
Article type: Article
Session ID: S1108-2-5
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Change in micro slant edge profile and a lubrication characteristic of parallel sliders during running-in condition are investigated. Grooved ring on flat ring tests in various running-in conditions were conducted to evaluate the change in bearing profile, wear depth and frictional properties. It is found that the height of the micro slant edge increases with increasing in running-in time. In addition, a sliders with microgrooves(MG) parallel to a sliding direction is employed in order to investigate surface roughness effect. From the experimental results, it is found that the friction coefficient of the sliders with the MG decreases although higher slant edge can be generated rather than that of a slider with isotropic roughness.
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Nozomi Komada
Article type: Article
Session ID: S1108-2-6
Published: September 04, 2010
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The present study describes an applicability of micro shot blasting as surface modification for improvement of cooling performance of heat sink. Fine silicon carbide grid was used for the impact media since the higher thermal conductivity. Micro shot blasting was applied to the heat sink made from aluminum alloy used as cooling device for a central processing unit of a personal computer. The cooling performance of the heat sink was evaluated on two conditions depending on whether external air flow existed or not, naturally or forced air cooled conditions. As results, it was found that the surface modification with the micro shot blasting was effective for improving the heat transfer of the heat sink at the forced air cooled condition.
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Yusuke ASAKA, Keiichi WATANUKI
Article type: Article
Session ID: S1108-3-1
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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We investigate how people feel product's impressions using functional near-infrared spectroscopy (fNIRS). We show product's pictures processed in various ways and price to subjects, they decided to purchase or not. Then, we observe their brain activities using fNIRS. Subjects reported their impressions about product's appearance and prices. Product's pictures assign to categories by kinds of process. We classified results in the category. Viewing picture of the category with the trend of low level rating on impression of the product's appearance, the orbitofrontal cortex changed activity. Viewing ones with the trend of one-sided rating, the orbitofrontal cortex changed activity more widely. These findings suggest a possibility that the orbitofrontal cortex changed activity corresponding to impressed level by viewing product's pictures.
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Naoko SEGA, Eiichirou TANAKA
Article type: Article
Session ID: S1108-3-2
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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We have developed a walking assistance apparatus using a spatial parallel link mechanism. This apparatus was designed to assist in the rehabilitation of patients who have difficulty walking. The apparatus utilizes a compensating gravity mechanism that helps center gravity during the stance phase of walking. To confirm the effectiveness the mechanism, we compared the measured data of the height of the hip joint on the apparatus while walking between with the mechanism and without the mechanism, and measured the value of the force which lifted the upper body with the mechanism. From these results, it can be verified that the mechanism output the lifting force during the stance phase of walking, and the hip joint kept the adequate height while walking by using the mechanism.
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Naoya TAKE, Hiromu HASHIMOTO
Article type: Article
Session ID: S1108-3-3
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Thin, flexible and long materials such as paper, metallic thin film and optical film are called webs. These are the important materials supporting our life. In recent years, the market of the webs is increasing rapidly because of the public demand for Flat Panel Display (FPD), electronic paper and solar cell. Therefore, it is very important to improve the productivity of the web in the manufacturing site. The webs are produced by Roll to Roll producing system, which production method can be continuously produced. On the other hand, the production system may undertake a great loss. Therefore, it is necessary to correctly transport the webs. However, the webs have possibility of defect such as wrinkle and slip because the webs become very thin recently. These defects can be prevented using concave roller. We experimented wrinkle generation using concave roller. As a result, the effectiveness of concave roller is verified experimentally.
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Haruna ONO, Ryo TSUBOI, Shinya SASAKI
Article type: Article
Session ID: S1108-3-4
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Formation of adsorption layer on sliding surface causes important roles for the friction and wear of materials under lubrication with additives. In this study, we have applied the Quartz Crystal Microbalance (QCM) for the in-situ monitoring of adsorption phenomena. The QCM is a sensitive mass measuring method of applying an inverse piezoelectric effect. As a result of the experiments, we confirmed that the QCM method was effective for the in-situ adsorption behavior monitoring. In addition, we measured friction coefficient by using a pendulum friction tester and investigated the relation between the friction and adsorption behavior by changing the lubricating temperature conditions. Obvious changes were shown both in the adsorption and the friction behavior at a temperature of 60℃. which was a desorption temperature ofoleic acid.
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Hirokazu YAMAMOTO, Masaya HAGIWARA
Article type: Article
Session ID: S1108-3-5
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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In bolted joints, the load on the threaded fasteners are affected by the mechanical structure of clamped members and the clamping force, and various types of failure are expected through complicated mechanism. Therefore, it is important to acquire knowledge concerning the failures mechanisms and their effective measures to realize the reliable bolted joints. In order to get the specialized knowledge utilized for design and maintenance of mechanical systems, we have to manage a lot of information from various areas. The aim of this study is to develop the fault diagnosis database for bolted joints which can provide specialized and customized knowledges for individual design engineers. The structure of data module based on Hierarchical Fault Classification Method is proposed, and the user interfaces are discussed. The classified data offered by this database system is enable user to search for technical information without any difficulty, and to support the design procedure systematically.
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Masahiko ASANO, Morimasa NAKAMURA, Kenji SAITO, Ichiro MORIWAKI
Article type: Article
Session ID: S1108-4-1
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Viscoplastic parameters are required to simulate such a hot forging process and creep failure. These phenomem greatly depend on viscoplastic behavior of materials. The present paper describes a developed test rig which enables the viscoplastic parameters of metals to be identified. In the test, a hollow circular bar is twisted under the maximum bai temperature of 1473 K and the maximum strain rate of 10 s^<-1>, and the angle of torsion and applied torque are mesured The viscoplastic parameters can be evaluated from the relationship between them.
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Ryousuke SUZUKI
Article type: Article
Session ID: S1108-4-2
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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In a production process of rail vehicles, several panels such as a ceiling panel and side panels are assembled by fusion welding. The welding heat causes the assembled vehicles to be slightly distorted. In the next interior fitting process of the rail vehicle production stage, a huge number of parts must be fitted, such as air conditioning units and frame bars for straps, etc. It is very difficult for those parts to be fixed into the railway vehicles since the bolt holes are not in a right position because of the welding heat. So it is of very importanceto measure shapes of the panels and the bolt holes after the welding process. In this study, we have developed a new type of laser coordinate measuring machine with a laser distancemeter and two Galvani-mirrors. In experiments a rafter hanging on a stage was measured and its measuring accuracy was discussed.
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Tomomi MAKISHITA, Satoshi ENOMOTO, Hiroshi ISHIDA
Article type: Article
Session ID: S1108-4-3
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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This article reports on an underwater robot that searches for chemical sources in stagnant water. Biological studies suggest that crayfish in search of foods generate water currents by using their fan organs (maxillipeds). The proposed robot is equipped with two pairs of fanning arms mimicking crayfish maxillipeds. The chemical substance staying near the floor is stirred up by the water currents generated by the second pair of fanning arms, and then, is collected to the chemical sensors by the inflow generated by the first pair of arms. Experimental results are presented to show that adding the second pair of fanning arms significantly improves the chemical detection ability of the robot and therefore the success rate of the chemical source localization. These results suggest that active flow generation is essential for crayfish to search for foods by tracking their smells.
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Eriko FUKUDA, Shoji NOGUCHI
Article type: Article
Session ID: S1108-4-4
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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The surface of the rolling element and the orbital plane might cause corrosion with the tire of the bearing when the potential difference is privately caused and it become damage. Thus, the phenomenon of damaging the bearing by the influence of the current is called a stray current corrosion. The bearing for the railway vehicle and the damage case with the ball bearing for a small motor are chiefly reported. The motor of the running total velocity rotation is developed, and there is a lot of demand, too. Then, the experiment in the high-speed rotation region (1800 rpm or more) to the stray current corrosion is needed. The development of the device that can correspond to the high-velocity revolution is a purpose because it cannot correspond to the high-velocity revolution in a present pilot machine. In a past device, the housing part was L character type and situation like overhang mounted impeller. It was made a box type and it made it to the situation of tael. It was stopped to connect with the belt pulley and to drive three axes, and installed the motor in each one of the axis. To confirm the rigidity of the device, the vibration value by 1800 rpm, 3600 rpm, and 5400 rpm is measured by no energizing. As the result, the vibration value decreased by developing the testing set, and the amplitude was able to be stabilized.
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Shota OKUMURA, Masaya HAGIWARA
Article type: Article
Session ID: S1108-4-5
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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It is one of the important issues for structural safety to control the clamp force of bolted joints. However, there is no tightening testing apparatus commercially available to evaluate the tightening characteristics for wide variety of fasteners in accordance with ISO 16047. This study aims to develop a new testing machine for torque/clamp testing, which will meet the requirements specified in ISO16047. In this study, the root cause of measuring error is analyzed both experimentally and analytically. Finally, it is found that the torque acting on the preloading bolts may affect the sensitivity of piezoelectric force sensors as well as the inherent characteristics of sensors, and the method to boost the accuracy is proposed.
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Daiki SANNOMIYA, Takayuki TOKOROYAMA, Noritsugu UMEHARA
Article type: Article
Session ID: S1108-4-6
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Carbon fibers are expected to low friction materials. By knitting carbon fibers, it is assumed to be easier to manufacture low friction area rather than several carbonaceous coating such as DLC. However, friction coefficient of carbon fibers is not clarified and it is required to obtain low friction surface of carbon fibers with some surface modification technology. Ar-N_2 plasma irradiation was utilized to reduce the friction coefficient of carbon fibers. Static friction coefficient of carbon fibers was approximately 0.4 against SUJ2, Si_3N_4 ,DLC and carbon fibers. They depended on normal load. On the other hand, kinetic friction coefficient of carbon fibers was approximately 0.2 against all of mating materials. They did not depend on normal load so much. After the 1 0 minute irradiation of Ar-N_2 plasma , static and kinetic friction coefficients of carbon fibers decreased from 0.4 to 0.3. Kinetic friction coefficient of Ar-N_2 plasma irradiated carbon fiber decreased from 0.2 to 0.15.
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Hiroyuki FUJIWARA, Shigeo KOTAKE, Yasuyuki SUZUKI
Article type: Article
Session ID: S1106-1-1
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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It is reported that specific infrared ray is preferentially emitted from the surface of micro meter order periodic structure of a semiconductor, called infrared photonic lattice. In micro-fabrication of the silicon surface, photolithography is generally used as a manufacture method, however it is not suit for the small production of advanced meta-materials. In contrast, the machining method can produce the lattice of arbitrary shape. In this study, thermal oxidized surface of (110) single crystal of silicon was scraped with a diamond pen to remove the oxidation mask, and was etched in KOH solution to make comb-shaped Si stripes of 15 or 20um wide and 15 or 20um depth. The specimen was Au coated by DC sputtering. 9 and 13 urn infrared light were preferentially emitted from some of the specimen, which was heated at 673K.
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Arisa SAKAKIBARA, Fumihiro ITOIGAWA, Takashi NAKAMURA, Shinya HAYAKAWA
Article type: Article
Session ID: S1106-1-2
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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It has been well-known that finely-structured texture on surfaces can bring about stable friction and wear situation. In this study, investigation into the effects of surface nano-texture on tribological properties of fluorocarbon thin film was conducted by sliding friction tests. The nano-structures were generated on the surface of fluorocarbon thin film by means of nonequilibrium atmospheric-pressure remote plasma. Fabrication mechanism of this texture was attributed to anisotropic etching of film surface. Experiment results were shown that surface nano-texture was effective in improvement in friction and wear properties offluorocarbon thin film under lubrication conditions.
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Hiroki NAGATSU, Fumihiro ITOIGAWA, Kazutoshi NAKAMURA, Takashi NAKAMUR ...
Article type: Article
Session ID: S1106-1-3
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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This paper describes the effect of tool surface integrity and lubrication mechanism on micro cutting. In this study, two kinds of tools with different surface integrity were applied to investigate tribological phenomena in micro cutting process. Orthogonal cutting test was conducted and cutting force was measured by changing the cutting conditions. Cutting conditions were air, nitrogen and lubricated condition by paraffmic oil. As a result, it is found that the difference of surface integrity affects lubricants penetration into the interface between tool and chip. Cutting condition, particularly oxygen concentration, affects friction. Cutting force was stable and adhesion on tool rake face was prevented on dry condition.
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Yoshio HARUYAMA, Junji YOSHIDA, Noriyo HORIKAWA
Article type: Article
Session ID: S1106-1-4
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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The tribological performance of TiAlN film doped with minor constituents of Cr and Si elements was investigated. The tribological characteristics were evaluated by a ball-on-block sliding test against an alumna ball. The friction coefficient was around 0.7, which was not much different from that of TiAlN film, and the wear amount was found to be around a half compared with TiAlN film. The film life was evaluated by a ring-on-block sliding test against an aluminum alloy. The film life of TiAl(Cr,Si)N film was very short compared with TiAlN film.
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Yousuke NAOI, Fumihiro ITOIGAWA, Takashi NORIHISA, Takashi NAKAMURA
Article type: Article
Session ID: S1106-1-5
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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This paper describes the transition phenomenon of boundary friction in ultimately low speed condition under low contacting pressure condition. When lubricant containing the oleyl acid phosphate is used under the low contacting pressure condition, strong increase tendency in friction with sliding speed diminishes at less than 0.1μm/s of sliding speed. From the experimental results, it is found that boundary lubricant behaves as Bingham plastic material. Consequently this transition phenomenon of friction might be associated with structural force effect.
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Kentaro HAYASHI, Nobuki OZAWA, Tomomi SHIMAZAKI, Momoji KUBO
Article type: Article
Session ID: S1106-1-6
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Diamond-like carbon (DLC) coated surface has a super-low friction feature under the specific conditions. Fontaine et al. reported that the super-low friction coefficient is achieved at the interface between a DLC coated surface and the iron surface in high-vacuum environment [This Solid Films, 482, 99, 2005]. They reported that carbon-transfer film on the iron surface is observed when this interface shows the super-low friction. However, the mechanism of the super-low friction is not clear. This study investigates the mechanism by tight-binding quantum chemical molecular dynamics method. We present significant influences of hydrogen molecule to the super-low friction.
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Yuichi NAKAMURA, Hideki TACHI, Masahito MATSUI
Article type: Article
Session ID: S1107-1-1
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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High-pressure rheological properties of solidified lubricant oils and greases were evaluated by an originally proposed new method, that is, the large plastic deformation analysis of metal microspheres (about 0.07 mm) in these lubricants, occurring due to non-hydrostatic pressurization of a diamond-anvil pressure cell. The solidification pressures obtained by observing aluminum sphere deformation were 0.2-0.7 GPa for traction grease and oils, 1.3-1.8 GPa for synthetic base oils and their urea or lithium greases including ionic liquid and recent aerospace lubricants. The solidification pressures were almost the same values among base oils and their greases. By substituting the solidification pressures and pressure-viscosity coefficients in the Barus equation, viscosities at the solidification pressure were obtained. The values were different for each oil and were within the order of 10^4〜10^7 Pas. Based on several assumptions, rough equivalent traction coefficients of the solidified oils could be estimated up to 4 GPa.
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Hideki ENDO, Alan HASE, Hiroshi MISHINA
Article type: Article
Session ID: S1107-1-2
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Acoustic Emission (AE) is the emission of elastic stress waves resulting from deformation and fracture of materials. The AE signals depend on the intensity of deformation and fracture of materials. A tribological phenomenon is a kind of deformation and fracture occurred at material surfaces. Therefore, it could be possible to observe the tribological phenomena by measuring AE signals. In this paper, we measured AE signals and voltage of contact in dry rubbing. A state of the contact influences tribological phenomena. Accordingly measuring contact voltage makes evaluation of the contact state effective. The AE signals were analyzed by short time Fourier transform. We examined frequency spectrum of the AE signals accompanied by the different shifts of the contact state. In consideration of that, we discussed the relationship between AE signals and tribological phenomena.
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Shingo OZAKI, Chihiro Itoh
Article type: Article
Session ID: S1107-1-3
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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In the present study, a phenomenological rate-dependent friction model is implemented in the dynamic finite element method. Typical frictional contact problems, which are consisted by elastic and rigid bodies having simple shapes, are then analyzed by the present method. The validity of the present method for the analysis of stick-slip motion under dry condition is examined. It is shown that the present method can solve stick-slip motion within the framework of continuum mechanics, whereas it cannot predict by the conventional finite element method based on the rate-independent friction model.
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Yoshiro IWAI, Akira MIZUNO, Toshiro MIYAJIMA
Article type: Article
Session ID: S1107-1-4
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Diamond-like carbon (DLC) films are used in various fields because of their ability to generate low friction and high wear resistance. Although there are many evaluation techniques for the surface strength of DLC films, they are not yet sufficiently established. In the present study, we evaluated the wear property of DLC films deposited by unbalanced magnetron sputtering under different bias voltages (0 V, -50 V, -100 V, -150 V). The wear rate (um/min) decreased with increasing bias voltage. In order to discuss the wear mechanism, the worn surfaces were observed by Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM). As a result, the wear proceeds by crack propagation for soft DLC (0V), and by impact fracture for hard DLC film (under bias voltage).
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Yuta SUNAMI, Kei ITO, Masayuki OCHIAI, Hiromu HASHIMOTO
Article type: Article
Session ID: S1107-1-5
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Fluid film bearings are widely used for HDD spindle motor. Recently, HDD is required to improve shock resistance because of using many mobile devices such as mobile PCs, portable audios and car navigation systems etc. Therefore, in the manufacturing of the spindle motors, designing parameters for fluid bearings are important to decrease vibration displacement of the bearings. Moreover, it is necessary to comprehend dynamic characteristic of the fluid film bearings to improve its problem. The oil film coefficients, spring and damping coefficients, are analyzed theoretically. However, so far, experimental research has been limited because the spindle consists of a pair of upper and lower bearings. In this paper, we describe a method of identification for oil film coefficients experimentally. At first, we measured the displacement response of the fluid film bearing vibrated by disturbance, after that conducted curve fitting to identify the oil film coefficients.
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Shogo TAKE, Yuta SUNAMI, Masayuki OCHIAI, Hiromu HASHIMOTO
Article type: Article
Session ID: S1107-1-6
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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This paper describes the experimental study on shock response of fluid bearing for HDD spindle motor. Comprehending of vibration characteristics is important to designing the fluid bearings for HDD spindle motor because HDD is used for many mobile devices such as mobile PCs, mobile audios and car navigation systems recently. Moreover, when the fluid bearing is vibrated by disturbance, the rotating shaft has a possibility to come in contact with the bearing. Hence, wear and seizure occur between the shaft and the bearing. Therefore, it is necessary to know the vibration characteristics of bearings for HDD spindle motors. In this study, we made the experimental apparatus, and measured shock response of the bearing.
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Hidenori KOMATSUBARA, Hiromori KUMAKURA, Kazunori Goto, Tatsuya Ohmach ...
Article type: Article
Session ID: S1103-1-1
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Let the marine transmission using conical gears be called "Conical Drive Marine Transmissions". For these years, marine transmissions having high capacity have become an urgent need. To answer this need, it is necessary to increase both the tooth surface strength and the bending strength. The authors have already developed concave conical gears which made it possible to increase the tooth surface strength. And now, as the gears which makes it possible to increase the bending strength, we invented a new type of concave conical gear, called "Hyper Conical Gear". That is to say, the Hyper Conical Gear is the gear having both the increased tooth surface strength and the increased bending strength. This research aims at developing the design and production system of the Hyper Conical Gear. In this report, the first, the principle of generating method of the tooth surface is described, and the tooth surface is analyzed theoretically. Secondly, test gears are designed and made for trial. Finally, the tooth surface of the test gears are measured and compared with theoretical ones. And, it is proven that the generating method of"Hyper Conical Gear" has the availability. This research opens the way to conical drive marine transmissions having high capacity. In the 2nd report, the design and production method of a pair of these gears are reported.
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Kazunori GOTO, Hidenori KOMATSUBARA, Hiromori KUMAKURA, Tatsuya OHMACH ...
Article type: Article
Session ID: S1103-1-2
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
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Let the marine transmission using conical gears be called "Conical Drive Marine Transmissions". For these years, marine transmissions having high capacity have become an urgent need. To answer this need, it is necessary to increase both the tooth surface strength and the bending strength. And now, we invented a new type of concave conical gear, called "Hyper Conical Gear". That is to say, the Hyper Conical Gear is the having both the increased tooth surface strength and the increased bending strength. In this report, the design and production method of a pair of intersecting axis Hyper Conical Gears is presented. First, the relationship between the basic dimensions and the mounting dimensions of a pair of gears is obtained. Thus, the design procedure of a pair of intersecting axis Hyper Conical Gears is presented. Finally, test gear are designed and made for trial, the tooth bearing of the test gears measured and compared with analytical ones. And, it is proven that the design and production method of a pair of Hyper Conical Gears have the availability.
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