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山口 誉夫, 黒沢 良夫, 松村 修二, 野村 章
2003 年 69 巻 678 号 p.
297-303
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
This paper describes vibration phenomena for stiffened elastic panels having viscoelastic damping layer. The panels are stiffened by beads. The laminated panels are modeled using three-dimensional finite elements in consideration with complex modulus of elasticity. Further, applying asymototic method to the discreted equations of motion, explicit expressions of modal loss factors for the laminates are derived. Consequently, the expressions have similar form to Modal Strain Energy Method, which is proposed by Jonson. Numerical code is developed related to the expressions. Vibration damping properties of the bead panels, which are calculated by the code, is consistent with experimental results. Temperature dependence of the damping properties by FEM also agreed well with the experiments. These investigations reveal that modal damping decreases due to beads of the panels.
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山口 誉夫, 黒沢 良夫, 松村 修二, 村上 聡, 澤田 耕吉
2003 年 69 巻 678 号 p.
304-311
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Viscoelastic damping materials are laminated on car body panels to reduce structure borne noise. In usual, these panels are stiffened by beads. Damping properties of the panels are sensitively affected by their complicated configurations. In the first report, we studied about prediction methods of damping properties for both bead panels and actual vehicle models having non-constraint viscoelastic layer. Applying asymototic method to the discreted equations of FEM, explicit expressions of modal loss factors for the laminates were derived, and then were verified by experiment. In this report, sensitive effects of geometry of beads (e.g. length of beads, height of beads and so on) on modal damping were revealed in detail. Applying Inoue's method, we also analized damping phenomena on the bead panels using distribution of dissipated energy between inplane deformation and out of plane deformation.
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岡部 匡, 近藤 孝広, 浜尾 晋次
2003 年 69 巻 678 号 p.
312-319
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
The improved averaging method suggested in our previous report is developed in order to obtain a highly accurate periodic solution for a strongly nonlinear system. In this reports, the Jacobian elliptic sine and delta functions are applied as generating solutions for harmonically excited Duffing-type equations with softening spring and snap through spring, respectively. Two types of stability criterion for approximate solutions obtained by the present method are also discussed. The present method is applied to the systems with some kind of nonlinear spring. By comparing with the very accurate numerical solutions obtained by applying the shooting method, it is confirmed that the present method gives more accurate solution and more accurate results for stability of the solution than those obtained by the traditional averaging method using the trigonometric function as a generating solution.
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加藤 光広, 安田 仁彦, 西内 秀夫
2003 年 69 巻 678 号 p.
320-327
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
The occurrence of combination tones in a beam subjected to a nonsymmetric excitation having three components, one independent of, and the other two carmonically varying with, time is considered. To analyze the problem, the method of multiple scales is used. The analysis shows that some combination tones can occur originally for nonsymmetric excitation system and the combination tones occurring for a case in which several resonance conditions are satisfied simultaneously have the complicated vibration characteristics. The validity of the theoretical analysis is confirmed experimentally.
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川本 広行, 梅津 信二郎, 小泉 竜太, 白石 潤平
2003 年 69 巻 678 号 p.
328-334
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Electrohydrostatics was investigated in a pin-to-plate discharge system that consisted of the rigid pin electrode made of metal and the ion-conductive water electrode. At the dark discharge region, because extremely small electrostatic pull force, Coulomb force in the order of 10 μN, was induced, water shifted upward in the order of several 10 μm at the opposite center to the pin electrode. 0ver a threshold voltage corona discharge took place and a relatively large repulsive force, in the order of 100 μN, was induced due to the ionic wind. It depressed water and a large depression of water, in the order of several 100 μm at the center, was observed even to the naked eye. This phenomenon was named "Electrostatic Moses Effect." Deformation of the water level coincided with the pressure distribution on the metal plate electrode, if the surface tension of water and Coulomb force was included in the estimation to derive pressure distribution from the measured deformation of the water level. At the dark discharge region total force to the water electrode coincided with that to the pin electrode. However, it was larger than that to the pin electrode at corona discharge, because the reaction force due to the ionic wind was applied not only to the pin electrode but also to other part of the opposite electrode at the corona discharge.
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岡野 恭久, 松岡 太一, 大亦 絢一郎
2003 年 69 巻 678 号 p.
335-342
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
In this paper, a new type of arm-type friction damper with two links and three joints (two universal joints and a hinge) has been developed. The friction damper is able to suppress six modes of vibration of a machine, three in translational modes and three in rotational modes. The trial friction damper was made and the resisting force characteristics in the three translational directions were discussed theoretically and experimentally. The seismic responses of a two-degree-of-freedom system and a three-degree-of-freedom system consisting of a mass and four coil springs and supported by the friction damper were measured using a two-dimensional electrohydraulic type shaking table. The experimental results are compared with the calculated ones, and the effects of vibration suppression of the friction damper in two or three translational directions are discussed.
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掛川 智義, 鈴木 拓, 佐藤 栄児, 梶原 浩一, 田川 泰敬
2003 年 69 巻 678 号 p.
343-348
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
For aiming the completion of 2005, 3-D Full-Scale Earthquake Testing Facility is now under construction in Miki city, on the north of Kobe city. The basic performances of this facility are the maximum velocity of 200 cm/s and the maximum displacement of 200 cm p-p in the horizontal excitation with the test weight of 1200 ton. Although, the developments of the servo valves, actuators, etc. are progressing in order to realize above performances, there is no appropriate analytical model for simulation and control system design. The object of this study is to find the effective linear analytical model and control algorithm for the 3-D Large-Scale Shaking Table.
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竹原 昭一郎, 曄道 佳明, 能見 公博, 曽我部 潔
2003 年 69 巻 678 号 p.
349-355
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
In this paper we discuss about motion of a system consisting of a string and rigid bodies at its end. A tethered subsatellite in space is known as an example of this system. The string in planar motion is described by using Absolute NodaI Coordinate method. In this method, it is easy to describe the motion of the string with a large deformation, rotation and translation displacement. The string motion influences the motion of the rigid bodies. In other words, the connection point is constrained by the end of the string. Therefore the motion of the system is calculated using differential algebraic equations. First, the motion of the string with a large deformation, rotation and translation displacement is simulated for a simple case. The numerical results agreed with the experimental results qualitatively. Second, the simulations for the some cases of a string with rigid bodies, a string that doesn't have deflection with rigid bodies, and a string with a simple mass are performed. In these cases, an end of the string moves horizontally. As a result, the mechanism of the interaction between the string deflection and the rigid bodies rotation is made clear numerically.
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長松 昭男, 角田 鎭男, 平松 繁喜
2003 年 69 巻 678 号 p.
356-363
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Concept and use of virtual product are presented for next age fully computer integrated development of automobile. Functional model based on a new modeling approach proposed by the authors is presented for constructing virtual product. 0bstruction factors against computer integration of automobile development are mentioned. A concept of virtual product is introduced as means for eliminating them. Structural content and construction method of virtual product is explained. As an application example, 10·15 modes virtual running test is illustrated using virtual product proposed by the authors.
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石原 国彦, 岡田 茂美
2003 年 69 巻 678 号 p.
364-370
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
This paper describes the vibration and noise reduction of a stepping floor of a movable seat used in a dome. This seat is made of steel because of being movable. Consequently the vibration and noise occur due to the walking and the jumping of spectators and the problems appear to be that the noise makes it difficult to hear the announcer and the seat is uncomfortable to sit on. Then, the prediction of the reduction effect of the damping material is performed by the transient response calculation and the modal analysis, and the predicted values are compared with the experimental results. As a result, the calculation result is in good agreement with the experimental one and the reduction effect is simply expressed by the ratio of loss factors before and after countermeasures in case of being able to neglect the mass of the damping material.
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福田 良司, 田中 信雄
2003 年 69 巻 678 号 p.
371-378
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
This paper presents a novel control method utilizing acoustic cluster filtering and cluster actuation, thereby enabling one to suppress the structure-borne sound without causing observation/control soillover problems in the sense of cluster. The acoustic cluster filtering, which is realized by just only 4 microphones when the rectangular plate is targeted. Acoustic cluster is used as the error signal in this proposed method. 0n the other hand, cluster actuation is a control strategy to activate the specific targeted cluster without inducing the control spillover in a cluster sense, its conceptual background being based upon cluster filtering ; all the structural vibration modes existing in a distributed-parameter planar structure may be filtered into four clusters. First, this paper begins by introducing the transformed sound pressure vector that becomes the foundation of a cluster filtering. Then, an acoustic field function is presented, and hence sound pressure is obtained by integrating the acoustic field function multiplied by modal functions of a planar structure. Next, from a viewpoint of cluster actuation, the optimal control law for minimizing the acoustic cluster outputs is derived, its implementation being realized by using a Filtered-X LMS algorithm. Finally, the experiment using a simply supported rectangular panel is conducted, demonstrating the validity of the proposed method.
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原 進, 高橋 昇, 成清 辰生
2003 年 69 巻 678 号 p.
379-386
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Nonstationary optimal regulator (NOR) is one of the effective methods for positioning control of vibration systems. NOR corresponds to an LQ regulator utilizing time-varying weighting functions and produces positioning trajectories taking the vibration characteristic of a controlled object into account. Generally, many positioning or tracking mechanisms such as information equipments, machine tools and robots adopt dual-stage actuator systems (DSASs). DSASs consist of coarse and fine actuators and realize efficient and high performance responses. However, the control method for DSASs with mechanical flexibility has not been fully addressed. This study utilizes the NOR technique for positioning control of DSASs taking spring and damping elements of controlled objects into account. We use a proper combination of time-varying weights for this problem. The effectiveness of this method is verified by numerical calculations and experiments.
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矢野 賢一, 戸田 貴弘, 東川 晋平, 寺嶋 一彦
2003 年 69 巻 678 号 p.
387-395
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
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小島 広久, 田中 成和, 藤井 裕矩
2003 年 69 巻 678 号 p.
396-401
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
The robust time-optimal control for the rest-to-rest maneuver is excellent for the case where modeling errors are small. However residual vibrations cannot be eliminated when large modeling errors exist. To solve this problem, this paper proposes a control method named Minimum Sensitivity Control for the rest-to-rest maneuver of a flexible space structure. The sensitivity of residual vibration with respect to modeling errors is chosen as the performance index and minimized to obtain the optimal control profile by which the residual vibrations due to the modeling errors are less induced in this study. Results of numerical simulations and experimental analyses of the proposed control method are compared with that of the robust time-optimal control method to demonstrate the effectiveness of the proposed control method.
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秋下 貞夫, 井上 泰徳
2003 年 69 巻 678 号 p.
402-407
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
This paper describes an active control of sound transmission in intelligent compound structure. The structure, dimension of which is 160 mm×38 mm, consists of PZT bi-morph piezoelectric plate of 0.6 mm thickness and two sheets of stainless steel plate of 0.1 mm thickness. In the piezoelectric plate, each of three portions of electric pole is formed for functioning as actuator and sensor, respectively. The active control aims reducing bending vibration in the structure for the two natural modes at 210 Hz and 830 Hz, then the Internal ModeI Control and the robust H-infinity control are constructed. The latter control proved satisfactory control performance to reduce the level of vibration amplitude of the sensor signals by about 15 dB.
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杉田 秀彦, 濱田 吉郎, 山口 功, 葛西 時雄, 井川 寛隆, 木田 隆, 長塩 知之, 児子 健一郎
2003 年 69 巻 678 号 p.
408-415
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
In this paper, we study a design method of precise attitude controller of a LSS having problems of elastic vibration and parameter variation. For the problems, H
∞ robust control, μsynthesis or gainscheduling control are known to be efficient. In this study, we apply gainscheduling control to the problem. Although many types of gainscheduling controller have been studied, we adopt an approach based on spline-type parameter-dependent quadratic forms. At first we describe the algorithm of control system design with some extensions. Then we evaluate its performance by a numerical simulation for a typical LSS model.
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金子 真, 佐嶋 俊彦, 辻 敏夫
2003 年 69 巻 678 号 p.
416-422
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
This paper discusses the whisker sensor that can detect the surface features through a tracing motion. The sensor is composed of plural number of flexible beams with different natural frequencies, an adapter with strain gauge for each whisker, and an actuator for moving all of them. The mechanical vibration coming from the surface irregularities are picked up by each whisker and then converted into electrical signals through strain gauges. From the viewpoint of reducing the signal lines and cost, we feed all signals into one amplifier by connecting each strain gauge serially in the gauge box. Through the analysis of power spectrum, we estimate where the vibration comes from and how much irregularity is. We show the basic working principle of the sensor and experimental results to verify the idea.
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山内 紀宏, 朝倉 俊行
2003 年 69 巻 678 号 p.
423-430
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
The purpose of this study is to develop a multi-functional automated process controller for use in a synthesis system of chemical reactions. As chemical reactions are very complex, it is difficult to control the reaction temperature. Though a lot of synthesis systems using a PID controller have been often used to control the temperature of the reaction, the PID controller was not useful for change of chemical dynamics. Therefore, in this research, a neural network is applied for controlling the temperature of the reaction. First, neural networks controller is constructed to control the temperature of the chemical reaction using an original evaluation function. Then, neural networks estimate suitable parameters for the original error function. The effectiveness of neuro controller is examined through experiment. Finally, using the designed neuro process controller, it is verified that it can efficiently control chemical reactions.
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尾田 十八, 酒井 忍, 羽場 吉博
2003 年 69 巻 678 号 p.
431-436
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
It is very difficult to change simultaneously the pitching speeds and the courses in the usual used pitching machines of the arm type and the two rollers type. In this study, the pitching machine which is able to pitch exactly a base ball into various courses and speeds using the three rollers controlled independently the number of rotations, is developed. In the pitching machine, the layered neural network system in which the learning data use each course and speeds as input data and the number of rotation of each roller as output data is used. This machine is one of the intelligent sport machine. In this paper, the system and its mechanism are described.
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関森 大介, 臼井 智也, 升谷 保博, 宮崎 文夫
2003 年 69 巻 678 号 p.
437-444
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
A self-localization scheme for mobile robots based on model-fitting of a floor region captured by omni-directional vision is proposed to deal with quantization errors in these vision images, which has previously limited the utility of omni-directional vision. The self-localization method allows for better estimates of values by integrating the omni-directional imaging and the dead reckoning using the Kalman filter. The algorithm and experimental results using an actual robot are presented, and the robustness of the system is discussed based on error recovery when the robot position changes due to collision with other objects and human intervention in the real world.
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清水 毅, 小尾 誠
2003 年 69 巻 678 号 p.
445-450
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
This paper presents the study of the model recovery of a 3-D object from the stereo image pair. This 3-D object is represented by superquadrics which are parametric and volumetric models. Superquadric parameters are estimated using genetic algorithm to minimize the texture feature of objects on the right and the left image. The estimation function depends on the shared area on both images and the distance of the density of the shared area. The actual models used in the experiment are the cube, the cylinder (small and big) and the eliptic column. In the experiment, the objects are placed randomly on the table in front of camera, and the resulting recovery success is 44 times out of 100 trials. After tuning of genetic algorithm function, the recovery success increased to 82 times out of 100 trials.
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大上 祐司, 吉田 彰
2003 年 69 巻 678 号 p.
451-458
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
The wavelet transform (WT) is a method for the time-frequency analysis of signals. It is possible to detect the change in each frequency through a sampling period by the WT. In this study, in order to discuss an evaluation method for the gear dynamic performance using the time-frequency analysis, the dynamic performance of both sintered and steel gears were measured using a power circulating gear testing machine in the range of the rotational speeds of 1600 to 10000 rpm. The measured signals of dynamic performance, which are tooth root strain, vibration and sound of gear box, were analyzed in the time-frequency domain by the continuous WT based on the Gabor function, and the signals of the dynamic performance were decomposed and reconstructed by the discrete WT based on the cardinal B-spline function. The validity on the new evaluation method using both continuous and discrete WTs was discussed. The dynamic performance can be divided between two frequency regions over and under the tooth mesh frequency fz. Consequently, it was clarified that the dynamic performance over the fz indicated the condition of the torsional vibration of gear system, and the dynamic performance under fz depended on the rotational speed of gear.
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廣川 純夫, 本間 晃, 山本 章
2003 年 69 巻 678 号 p.
459-463
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
The purpose of this study is to develop a gear-cutting method of hypoid gears to achieve a good tooth bearing and good performance for practical use. In the first report, the authors proposed a new cutting method of parallel depth hypoid gears which mesh with each other at one point at a constant angular velocity ratio, and precisely stated the theory for the gear-cutting method. In the second report, the theory of the trace of the point contact mark is shown precisely. 0ne of the features of this method is that the designer can control the trace of the point contact mark on the tooth surface as desired. In this report, the theory of the ellipse of tooth bearing is shown precisely. In order to confirm the validity of the method, some hypoid gears were designed and manufactured, and ellipse of tooth bearing on red lead corresponded to those of the theory.
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籠谷 正則, 蒔田 健一, 上田 博之, 小山 富夫
2003 年 69 巻 678 号 p.
464-471
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Synchronous belt drives are often used in bidirectional applications such as priniting machines, high-performance machine tools and industrial robotics, and are required to provide high transmission and positioning accuracy. Helical synchronous belt drives, in comparison to conventional synchronous belt drives, are effective for reducing noise and transmission error over single pitches of the pulley. In the present study, the transmission error of a helical synchronous belt drive under installation tension was investigated both theoretically and experimentally for the case when the drive reverses direction. The computed transmission error agrees with the experimental results, confirming the applicability of the proposed theoretical analysis for transmission error. It is found that transmission error in this case is generated by a change in the contact state between the belt tooth flank and the pulley tooth flank, and axial displacement of the belt between the driving pulley and the driven pulley. By setting the installation tension as high as possible, the transmission error can be reduced and stabilized more quickly. In addition, when the outside diameters of both the driving and driven pulleys are equal, transmission error does not occur.
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大岩 孝彰, 玉木 雅人
2003 年 69 巻 678 号 p.
472-477
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Conventional machine tools or coordinate measuring machines consisting of XYZ mechanism have difficulty to satisfy the Abbe's principle which is the basis of the precision mechanism. In other words, there are some offsets between the scale unit axes and the machining point or the measuring point. However, the machining point of machines based on the parallel kinematics can be located in the extension lines of the axes. In this paper, the effects of the joint errors on the motion error of Hexapod mechanism has been analyzed by using a singular value decomposition. The obtained main results are as follows : (1) The joint runout in the direction of the actuated prismatic joint strongly affects the translational motion error of the mechanism ; (2) the joint runouts perpendicular to the direction are negligible ; (3) the optimum link configuration which minimizes the working space and the effects of the runouts is found ; (4) the machining point need not be in the prismatic joint directions ; (5) the tool extension is optimized when the distance between the extensional line of the prismatic joints and machining point is minimized in each link configuration.
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木全 圭, 長谷 陽夫, 井本 正之
2003 年 69 巻 678 号 p.
478-486
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Universal joints, which transmit torque through the balls guided in such a manner that they always lie in the plane bisecting the angle between the driving and driven axes, are called ball-type constant-velocity joints. The authors presented the papers on the analysis of this type of universal joints based on statics taking account of no friction force between their components. To obtain more precise estimations of the internal forces and the moments, it seems to be important to evaluate the effect of the friction between the parts. Furthermore, in grasping the relative motions of the parts, such as rolling of the balls on the tracks, the static analysis is beyond its power. In this paper the authors analyze the motions of each parts based on dynamics, taking account of the frictions between the parts. The analysis results in simultaneous differential equations, which can be solved numerically using an electronic computer.
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木全 圭, 長谷 陽夫, 井本 正之, 小原 健
2003 年 69 巻 678 号 p.
487-495
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Ball-type constant-velocity joints are extremely important components of the front wheel drive systems of cars. However the method to analyze the characteristics of this type of joints has not been established. The authors previously presented papers on the analysis based on statics, in that no frictional forces inside the joints were taken into account. Recently the authors presented advanced analysis based on dynamics, in which the frictional forces were considered. In this paper the numerical analyses of a ball fixed joint (BJ) and a double offset joint (DOJ) used for the front wheel drive of a car are carried out using the simultaneous equations induced in the former analysis and the simultaneous differential equations induced in the latter analysis. Contact forces acting inside DOJ are measured using piezo-electric sensors. The results of the numerical analyses based on dynamics show better coincidence with the measured value than those based on statics.
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笹田 昌弘, 青木 勇
2003 年 69 巻 678 号 p.
496-501
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Experiments and FEM analysis on the piercing of small holes were carried out. Small hole, in this paper, means that the diameter is smaller than the thickness of the material. Material deformation in the piercing differs from that of conventional shearing. So, the piercing processes were calculated by rigid-plastic FEM analysis and elastic-plastic FEM analysis, experimental and FEM analytical results were compared, and material deformations and piercing forces were investigated. The results of elastic-plastic FEM analysis showed good agreement with the experiment results even more than the results of rigid-plastic FEM analysis.
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三木 恒久, 高倉 章雄, 金山 公三, 山口 克彦, 飯塚 高志
2003 年 69 巻 678 号 p.
502-508
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Compaction tests of mixed wood powders of cryptomeria with Japanese cypress are carried out at various forming conditions pressure, temperature, moisture content and particle size, in order to confirm the possibility of solidifiction without using adhesive made by petrochemisty. Effects of the forming temperature and pressure, the moisture content and particle size of the mixed wood powders on the compaction characteristics, bending strength, Vickers hardness and bulk density of the compacted products are discussed. The experimental results show that the bending strength, Vickers hardness and bulk density of compacted products increase with increasing temperature. And the maxmum bending strength is about 140 MPa when the forming temperature 180°C and moisture content 11%. However, the temperature is too high, the bending strength, Vickers hardness and density of compacted products tend to decrease due to bubbles generated in the compacted product.
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廣垣 俊樹, 青山 栄一, 片山 傳生, 近藤 久弥, 皆木 龍, 井上 久弘
2003 年 69 巻 678 号 p.
509-515
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
This study deals with the characteristics of blind via holes drilled using a laser beam on the multi-layer printed wiring boards. In the present report, we proposed a heat input model in laser drilling using the finite element method (FEM) in order to estimate the temperature in the bottom copper foil of blind via holes for the circuit connection between layers. On the other hand, the temperatures of copper foil in laser drilling were measured by thermo-couple. As a result, the calculated temperatures by this model considering the variation of the absorption of foil surface in laser drilling are good agreement with the experimental ones. It is confirmed that this model is effective to estimate the temperatures and thermal stresses in the bottom copper foil in laser drilling.
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梅崎 洋二, 有浦 泰常, 松本 純樹, 木村 大二郎
2003 年 69 巻 678 号 p.
516-523
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
The chip behavior that means the sticking to the cutting edge, the movements after cut, the flying directions and so on influences tool wear and surface finish quality in dry hobbing. The transient phenomenon of chip generation and behavior in milling with flytool are investigated by using high-speed video camera. Three typical chip generations, which are grouped in chip's curvature and flight ways, are observed in milling tests by the cutting edge of helix angle 0°. The chip's flight course changes by the tool tip materials into higher or lower flights. The phenomenon that the chip sticks to the rake face and it connects to the chip produced newly by pressure during next cutting is also observed. Chips stick easily to the rake face of cemented carbide tools. Under the conditions of lower cutting speeds less than 200 m/min and low hardness materials such as annealed or normalized low carbon steels, chips also stick easily to the rake face. The chip changes flight course by the location of ending point of cut on the fly tool.
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梅崎 洋二, 有浦 泰常, 松本 純樹, 吉村 圭介
2003 年 69 巻 678 号 p.
524-530
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
The transient phenomenon of chip generations and behavior in hobbing are investigated by using high-speed video camera. The chip behavior in gear finish hobbing process and in hobbing of a special workpiece with one tooth space is investigated. New visual findings such as the chip interference on rake surface and the condition of contact with the work surface can be obtained. In the case of dry cutting with high-speed steel flytool having non-coated rake face, the flytool cuts the workpiece frequently as attaching on the rake face with the chip before one revolution. The newly produced chip push out the old attached chip and flies away. The now of chip is interfered strongly at the corner of cutting edge when both top and side cutting edges produces it at the same time, and flow out as changing the shape. Three chips attached on the rake face before next cutting are also observed.
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李 彦良, 上野 俊夫, 三林 洋介
2003 年 69 巻 678 号 p.
531-538
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
This study took examined multi-stage flow-shop scheduling method of machine processes based on the independent setup between each manufacturing process. The conventional Branch and Bound scheduling method was applied and improved upon to suit this method, with the following results. 1) When applying this model to the conventional Branch and Bound method, an unreliable Low-Bound (LB) value results since idle time for unscheduled products is not included. Improvements to LB value, then, raises precision rates and leads to greater calculation efficiency. 2) Practical implementation of the proposed model also revealed an economically efficient number of required setup workers.
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福本 功, 銘苅 春榮, 松田 二郎
2003 年 69 巻 678 号 p.
539-544
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
Composite material mixed with Okinawa Kucha clay and the heat treated sludge which is an industry waste from sash factory was fabricated by compression molding and injection molding. These obtained results were as follows ; (1) In the compression molding with no use of binders, α alumina sludge particles inhibited the enlargement of numbers and size of pores caused by melting clay and the growing of pores when increasing the firing temperature. (2) The dimensional accuracy of fired body in injection molding was improved by increasing the content of sludge. (3) From the analysis of variance of bending strength, sludge content and injection pressure were specified as the significant factors on improvement of bending strength. The sludge particles perform the role of a reinforcement in the clay-sludge composite material. (4) By firing the body using micro wave sintering furnace, the sintering effect attributed to decrease the pores in the body comparing with the electric furnace. Especially, the bending strength improved drastically at the sludge content of 65%.
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長屋 幸助, 超 宇, 和田 誠, 金田 祐次, 安藤 嘉則, 村上 岩範
2003 年 69 巻 678 号 p.
545-553
発行日: 2003/02/25
公開日: 2008/02/26
ジャーナル
フリー
A new type leakage isolation sheet with self-repairing mechanism is presented, in which there is no water leakage when the sheet is broken. The sheet consists of two rubber sheets with lattices inside. Polymer particles are in the lattices, and sandwiched between the rubber sheets. The polymer particles expand in contact with water, and they become gel. The large pressure is generated in the lattice of the sheet. Hence, the sheets isolate water leakage. When the rubber is broken, polymer particles fall down with water. In order to keep the particles in the lattice of the sheet, textile sheets lie on the back surfaces of the rubber sheets. Experimental tests have carried out for a model of the sheet, and it is clarified that the proposed sheet isolates leakage perfectly under 1 MPa pressure when the sheet is broken by, 10 mm diameter punch.
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