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Hirofumi NESORI, Chihiro SHIBATA, Mami TANAKA, Yoshikatsu TANAHASHI, S ...
Article type: Article
Session ID: 2535
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper is a study on the development of an active palpation sensor wearable on a doctor's finger for detecting the prostatic cancer and hypertrophy. The receptor of the sensor is a polyvinylidene fluoride (PVDF) film placed on a rubber base. For convenience, the structure is made up of two parts, sensor and vibro-machine. The sensor is worn on a doctor's tip of a finger and the vibro-machine is attached to the base of the finger. First, it is confirmed that the output strength of the sensor is dependent on the stiffness of a flat object. Next, the stiffness of the apophysis of the hand and the root of the thumb were measured. The results showed that the sensor is effective to measure the stiffness of sphere-shaped objects.
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Feng WANG, Yanhui ZOU, Mami TANAKA, Tadashi MATSUDA, Seiji CHONAN
Article type: Article
Session ID: 2536
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper reports an unconstrained non-invasive sensing technique for monitoring the respiration and heartbeats using four pieces of polyvinylidene fluoride (PVDF) pizeopolymer films sensor developed for premature infants. The PVDF films are placed under the sheet at the location of the body of a premature infant to pick up the fluctuation of the pressure on the bed caused by the respiratory movements and heartbeats. A silicon rubber layer is placed under the PVDF films to enhance the sensitivity of the sensor. Preliminary experiments and clinical experiments verified the simultaneous detection of the respiration and heartbeats using the sensor.
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Mami TANAKA, Sayaka HATTORI, Ryuta KAWASHIMA
Article type: Article
Session ID: 2537
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper is an investigation of the specific active cerebral regions of human in connection with the tactile sensation, especially tactile sensation of fabrics. First, psychophysical test of subjective rating of tactile sensation using 7 types of fabrics was conducted. Principal components of tactile sensation are analyzed to the subject rating results. It was confirmed that the most principal components are "roughness" and "temperature". Therefore, these two terms, together with the most commonly used "comfortable" in ones daily life, are chosen as the items in the following test. Based on the above results, active cerebral regions in connection with these decisive items are investigated using event-related functional magnetic resonance images (f-MRI). Forty healthy volunteers participated in the fMRI test. The test is composed of a randomly arranged sequence of tasks of judgment of "roughness", "temperature", and "comfortable" separated by resting. Activation maps, conjunctions across subjects, were compared between tasks. These results show that the correlation between "temperature" and "roughness" is low and the correlation between "roughness" and "comfortable" is high.
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Takashi KABE, Ryota HIURA, Hiroyasu IKEDA, Noboru SUGIMOTO
Article type: Article
Session ID: 2927
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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FA robots are driven automatically in the enclosure of the safety guard at the steady time, and the door of the safety guard is locked, because they have usual many hazards. Recently, the various service robots, which fill the new roll and coexist with people, are researched, developed, and partially thrown into the market. Then, it is the situation, that people coexists with the hazards physically, and that the hazard situation will be promoted. However, the definition of the service robot is not fixed, and the standards about its safety are not decided worldwide. And the risk, the benefit, social agreement formation, the society system, which accepts it, will be prepared from now. Under that situation, before the international standard is established as the each product standard, the safety certification of the service robot wakamaru, which is thrown into the market as the practice of the technical innovation, is carried out. Based on the ISO/IEC Guide51, the standard of the certification is based on the risk decrease due to the safety design at the service robots, validation of the designer's responsibility about official notice of the residual risk, state of the art, and ALARR considering about the safety related standards.
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Tamotsu MURAKAMI, Hiroshi MORIMOTO, Kazuhiro OIKAWA
Article type: Article
Session ID: 2928
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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In this paper, we propose a representation of design concept drawing consisting of regions, paths, physical quantities and their transmission and insulation. By using the design concept drawing representation, we propose a computational design review method in the initial (conceptual design) stage of a machine design to systematically and automatically detect the possibility of the potential problems in the design which the designer probably is unconscious of. The proposed method is implemented as software described in Java so that the method is executed in internet environment. The method and software are applied to two simple design review problems to examine and confirm the validity and feasibility of the proposed method.
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kiyoshi FUKAYA
Article type: Article
Session ID: 2929
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The movable area of machinery is a danger area to prohibit human penetration. When this area is vast, it will happen that machinery is restarted without noticing human existence and an accident might occur. An accident prevention system, which uses RFID and detects worker's position, was developed and evaluated. In static condition there are position errors because of unhomogenous range of access of radio wave. In dynamic condition time factors such as transmission interval also causes position errors. Because of these defects this system can't be regard as a safety device that prevents accidents deterministically. But it can help an operator to know whether men are in dangerous area or not.
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Tomoumi ATSUMI, Noriaki OKAMOTO, Kazuhito WATANABE
Article type: Article
Session ID: 2930
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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A tray-carrying car with controller of temperature is widely used to carry sanitary and delicious meals in a hospital and a welfare institution. Accidents between the car and a human are said to happen sometimes, because this car is so heavy and large that it is difficult to drive it. This paper proposes the safety system in which as soon as the car collide with a human. a brake device works and then a shock absorber causes a large deformation in order to reduce the risk of harm.
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Takeshi ISEDA, Noriaki OKAMOTO, Kengo OOHASHI
Article type: Article
Session ID: 2931
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The final goal of this study is to apply the mechanism of inversion plastic deformation of an aluminum tube to the buffer for a high-speed elevator instead of oil-buffer. In this paper, first, the annealed aluminum tubes compressed on conical dies are shown to cause stable inversion plastic deformation, which has an ideal load-displacement curve as a shock absorber for various kinds of elevators. Secondly, it is described that the boundary between inversion and progressive buckling depends on the ratio of the thickness to the diameter of the tube. Finally, anti-Euler buckling is discussed for the long-stroke absorber of a high-speed elevator.
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Hiroshi KUSHIDA, Noriaki OKAMOTO, Masataka TABATA, Ryusuke AKANUMA, Ta ...
Article type: Article
Session ID: 2932
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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In this paper, axial crush behaviors and buffer characteristics of two types of box structures constructed with aluminium hollow extrusions due to axial compression are studied with experiment and Finited Element Analysis. These results show that box structures have the advantage of efficiency and capacity of energy absorption and therefore are suitable to members of impact energy absorbers for railway vehicles.
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Hidehiro Hata, Tetsuyuki Hiroe, Kazuhito Fujiwara
Article type: Article
Session ID: 2933
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The experiments of destruction in high-speed strain rate area have been used explosive and the Hopkinson bar Method, etc. There is the gap in the range of a strain rate between cases with explosive (strain rate: more 10^4 s^<-1>) and Hopkinson bar Method (strain rate: below 10^3 s-1). Therefore, experiments in this range ofa strain rate (10^3〜10^4 s^<-1>) are needed dearly. The purpose of this study is the experiment on high-strain rate at about 10^3 s^<-1>. Then, The mixture of Ammonium Nitrate and Aluminum powder was used instead of explosive in the present experiment. From these results, it became possible to experiment at the high-strain rate of about 10^3 s^<-1>
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Kensaku YOKOGAWA, Kazuhito FUJIWARA, Tetsuyuki HIROE, Hidehiro HATA
Article type: Article
Session ID: 2934
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The sterilization for fungi and bacteria in some kinds of dry powder foods is limited to keep their grade. Especially in spices the heat sterilization is restricted to minimum use, because the heat reduces the hot-taste that is a principal component in spices. The operation for the sterilization has to act only on fungi and bacteria, not to degrade the volatile components contained in flavor elements. In this paper, the instance of shock sterilization is shown, and the development of the idea to the sterilization equipment and its performance are presented. Experimental results showed the potential of the shock for the sterilization and the feasibility for the industrial use.
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Shu IZAWA, Takafumi FUKUDA, Naoya KASAI, Kazuyoshi SEKINE
Article type: Article
Session ID: 2935
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This Paper discusses practicable technique to determine the sensor location where the sensor detect bearing defect effectively. For this purpose, the characteristic of the vibration transfer is used. A simple model is assumed that the transmissibility of signal by defect is almost same as the impulse signal. By experiment, it is shown that the characteristic of the vibration transmission is used. The response of the vibration by bearing fault and the impulse response between bearing and housing are correlation. When the sensor is installed on the housing with a good transmission characteristic, detectability is high.
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
Session ID: 2936
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Tomonori AKIYAMA, Gaku SHOJI, Yoichiro MORI
Article type: Article
Session ID: 3009
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Shigenori MISAKI
Article type: Article
Session ID: 3010
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Nowadays, the cases, such as hiding product recalls and hazard information, are found here and there. Consumers are involved in fatal accidents, because of some product manufacturers neglect or fail to promptly respond to the potential product risks, even where they already recognize the existence of risks after their product shipment. When the problem actually happens, a company will be required to responsively conduct a precise and immediate recall to prevent the further expansion of damage. To pursue this smoothly, it is desirable that companies would get prepared for the recall response system in advance.
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Gaku SHOJI, Toshikuni TAKAMATSU
Article type: Article
Session ID: 3011
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Ikumi MATSUSHIMA, Gaku SHOJI, Tetsuo KAWAGUCHI
Article type: Article
Session ID: 3012
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Gaku SHOJI, Kazumasa HASHIMOTO
Article type: Article
Session ID: 3013
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Norimichi Kitagawa
Article type: Article
Session ID: 3014
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Engineering ethics requires three steps to be implemented successfully at companies while business ethics courses are required for students at universities and colleges. Find who is an engineer of a company and define his job description more precisely. Design engineer is a key player everywhere. Realize who moved engineering ethics during safety problems occurred recently in Japan to know glowing pressure over engineers' decision process. Establish supporting systems for engineers to keep engineering ethics in mind and follow a right way without fail. "Mono-tsukuri" culture could bring practical solutions towards this subject.
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Toshimitsu YOKOBORI, Shinji HOSONO, Ryuji SUGIURA, Koji SATO, Kazuhiro ...
Article type: Article
Session ID: 3301
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The estimation of the effects of cycle and time dependent mechanisms on crack growth behavior are important from the view points of the estimation of mechanical performance of the material. In this study, high temperature creep-fatigue interactive tests were conducted for nickel-based directionally solidified superalloy. The characteristics of the effects of cycle and time dependent mechanisms on crack growth life under high temperature creep-fatigue interactive conditions were shown to have different properties between them. Furthermore, a theoretical analysis was conducted to represent these characteristics.
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Akihiro KANAYA, Junichi KUSUMOTO, Masataka NAGAE, Toshimi KOBAYASHI
Article type: Article
Session ID: 3302
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Small punch creep (SPC) technique, a non-destructive test method, which is excepted to evaluate residual creep life of field exposed material more precisely compared with microstructure technique was studied. It was found that the load P in small punch creep test can be converted easily to the uniaxial creep stress σ which give the same rupture time as that obtained from the small punch creep test. The correlation is almost independent of welding, aging and deterioration
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Akihiro KANAYA, Junichi KUSUMOTO, Masataka NAGAE, Toshimi KOBAYASHI, T ...
Article type: Article
Session ID: 3303
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We developed a on-site electrical discharge sampling device, which can effectively take the sample of material such as a micro-specimen from the surface of parts of equipment. Comparing with conventional sampling device, our device could take a sample of material that is thinner in depth and larger in area (about 22mm×30mm×2mm). And the damage to the equipment could be held down to the minimum. In addition, the thermal affected zone of the material due to electrical discharge is much small and it could be ignored. Our sampling device provided a way to sample and machine various micro-specimen.
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Akihiro KANAYA, Masataka NAGAE, Junichi KUSUMOTO, Tomoki Miyamoto, Tos ...
Article type: Article
Session ID: 3304
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Small punch creep (SPC) method and an electric discharge type of sampling machine newly developed were applied to evaluate the residual creep life of thermal power plant. Sampling operation of test material from boiler pipe of power plant were performed on-site. The material sampled is about 1mm thickness×20mm wide×30mm length, and machined to SPC specimens of 0.5mm thickness. SPC tests with specimens of 0.5mm thickness were performed and a residual creep life was evaluated.
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Naoki KAWAKUBO, Takao UTUNOMIYA, Yutaka SATO
Article type: Article
Session ID: 3305
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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In recent years, the technical development and basic research on the reentry vehicles have been carried out actively. In order to develop the thermal protection system for the reentry vehicles, it is important to establish a method of material and structure component tests under high heat flux conditions. So, application of a new thermal structure testing system using high power laser-diode as a heat source is expectable. The new system consists of a laser-diode heating equipment and a couple of galvanometer scanner mirrors, and, by controlling the movement of scanner mirrors, the laser beam is expanded to the desired heating area. In this research, the heating test of the new system and the numerical analyses by finite element method corresponding to the experiments are carried out. Through the comparison of those results, the control method of the scanner for giving the uniform and non-uniform variational heating rates on the heating area is studied.
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Seiji SHIOZAKI, Yukinori SAKIYAMA, Shu TAKAGI, Yoichiro MATSUMOTO
Article type: Article
Session ID: 3306
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Many studies have been reported about the catalytic recombination of oxygen and nitrogen on silicon dioxide surface, which is quite important for the reentry of a space vehicle. But, the reaction mechanism is not fully understood. Hence, in this study, we are constructing a catalytic reaction model using the ab initio calculations and the Monte Carlo calculations in order to reveal the reaction mechanism. As the first step of this study, the Kinetic Monte Carlo (KMC) calculation was performed, in which the adsorption of incident atoms and the desorption events were considered. The recombination coefficient of oxygen molecules on a silicon dioxide surface was calculated and compared with the results in literatures.
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Yoshinari KIMURA, Naoyuki WATANABE, Toshio OGASAWARA, Yutaka SATO, Tak ...
Article type: Article
Session ID: 3307
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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High-temperature heating tests of CMC thermal protection system (TPS) panel were carried out by using the vacuum heating test equipment with the infrared lamp, and the temperature and displacement of the panel were measured at several points. The transient values of temperature, displacement and stress were calculated by using FEM with taking into account cavity radiation and the nonlinear stress-strain relation of the material. Calculated values by FEM indicate relatively good agreement with the experimental results.
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Toshio OGASAWARA, Takashi ISHIKAWA
Article type: Article
Session ID: 3308
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Hot-structures of high temperature composites are a well known key technology of light weight thermal protection system of a future space vehicle. Preliminary study on a hot structure elevon made of a SiC/SiC composite has been made for two years. A baseline model is HOPE-X elevon. Thermal and mechanical analyses were carried out using a commercial finite element analysis code. It has been understood that the disadvantage of SiC/SiC composite is its high coefficient of thermal expansion as compared with C/C and C/SiC composites, because thermal stress is dominant during re-entry.
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Takashi KAI, Takeshi ITO, Masakazu TAKAGAKI, Sotonari ARASHI
Article type: Article
Session ID: 3309
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Arc-heated wind tunnel tests for ZrB_2 specimens are under planning. These specimens have semi cylindrical shapes simulating sharp leading edges needed for future reentry vehicles. Pre-test thermal stress analysis is conducted for them. Maximum stresses increase as the heat rate rising gets steeper. Maximum stress occurring at the side surface edge can exceed the material strength.
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Tetsuya YAMADA, Seiji MATSUDA, Kei'ichi OKUYAMA, Nobuaki ISHII
Article type: Article
Session ID: 3310
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The USERS REV capsule achieved reentry flight from the low earth orbit and was successfully recovered on the sea in May, 2003. This paper presents the post flight analysis of the recovered heatshield of REV capsule and summarizes the lessons learned. REV capsule, totally about 670kg, has combined shape of the nose hemisphere and the rear conical part, and its size is 1.5m in diameter and 2m in length. REV is thermally protected against the aerodynamic heating by the carbon phenolic ablator heatshield. The heatshield was designed to satisfy the conflicted requirement of the heat release in the orbit and the thermal protection during the reentry. The design philosophy has been validated by the present successful flight and recovery. The reentry orbit and the flight environment have been reproduced based on the flight data and skin-radar tracking data. The thermal behavior of the heatshield is discussed in relation to the flight environment and the attitude motion of the capsule.
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Toshiya NAKAMURA, Kenji FUJII
Article type: Article
Session ID: 3311
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Thermal analysis plays an important role in the structural design of an atmospheric reentry vehicle subjected to severe aerodynamic heating. It is sometimes difficult to assess the compliance with design requirements because of the serious uncertainties in the predicted heat flux and the material properties. The present study demonstrates the probabilistic thermal analysis of an experimental reentry vehicle: PARTT. The aerodynamic heat flux, the emissivity of the heat shield, and the thermal conductivity of the insulator are selected as random variables. The coefficients of variations and the correlation coefficients (probabilistic sensitivities) of the temperature response will be investigated.
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Masaya TAGUTI, YUICHI Ikeda, Takashi KIDA, Tomoyuki NAGASHIO
Article type: Article
Session ID: 3312
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper describes the formulation of the dynamics equation of flexible multi body spacecraft based on the Kane method using a symbolic manipulaion software. It automatically derives the equations of the spacecraft having the arbitrary number of links in the tree configulation. We show a numerical simulation result that uses the finite element method for the model analysis and a passivity-based controller.
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Kazuya Konoue, Masashi Asami, Saburo Matunaga
Article type: Article
Session ID: 3313
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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It is necessary for flexible space robotic arm to handle the flexible payload suppressing the vibration. We will apply Input Shaping method to suppressing the residual vibration due to flexibilities of both the robotic arm and the payload, and examine appropriate command profiles to operate the arm. Input Shaping method decreases residual vibration in flexible systems by filtering the reference command with sequence of impulses known as the input shaper. In this paper, we report the results of the ground experiment, and discuss the validity of the vibration suppression control.
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Hirotaka SAWADA, Saburo MATUNAGA, Hiroshi UENO, Mitsushige ODA
Article type: Article
Session ID: 3314
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We generally move the end-effector (EE) of the robotic arm in very low velocity around the target position when we transport payloads in orbit. The joints of the arm also must be rotated very slowly in such circumstance. However, the joint rotates discontinuously in very low velocity because an influence of friction at reduction gears is dominant. The discontinuous rotation of joints possibly causes vibration when the arm is operated on a flexible base or it handles a flexible payload. We investigate operation methods to avoid the discontinuous rotation by utilization of a redundant arm. The redundant arm can maintain over a certain minimum velocity although the EE moves in very low velocity. In addition, we apply Input Shaping to suppress a residual vibration of the arm induced by the operation method of maintaining the minimum velocity. In this paper, we report the experiment results of the minimum velocity maintaining operation and Input Shaping application.
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Shin-ichiro Nishida, Satomi Kawamoto, Shoichi Yoshimura
Article type: Article
Session ID: 3315
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Since the number of satellites in Earth orbit is steadily increasing, space debris could eventually pose a serious problem to near-Earth space activities, and therefore effective measures to mitigate it are important. The Japan Aerospace Exploration Agency (JAXA), is investigating an active space debris removal system and the applicability of electro-dynamic tether (EDT) technology as its high efficient orbital transfer system.. A small expendable EDT package is under development The status of prototypes of bare tether, a reel mechanism, a deploying mechanism and the extension rate control system are described in this paper.
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Mitsunori SAITO, Kazuhiko FUKUSHIMA, Norio SATO, Katsuhiko IZAWA, Tats ...
Article type: Article
Session ID: 3316
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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A Magnetic Bearing Wheel (MBW) with inclined magnetic poles is under development, which enables the 5-DOF magnetic bearing to be composed of six electromagnets. This paper deals with the low disturbance control method of the MBW. This method feeds back force/moment disturbance of the MBW, and generates rotor position command to reduce the disturbance, which can decrease the disturbance induced by all disturbance factors such as rotor static/dynamic imbalance, sensor detection surface distortion, magnetic pole surface distortion, and resonance of the MBW and the MBW foundation.
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Hirohisa KOJIMA, Shuhei AOYAMA
Article type: Article
Session ID: 3317
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Formation-flight, which involves multiple spacecraft, is a key technology to conduct future space applications. In this paper, we study the formation flight of multiple spacecraft using virtual structure approach and backstepping method. In addition, in this study, two simple anti-windup methods are studied to avoid the controller saturation; tuning of backstepping controller gains, and tuning of virtual structure controller gains. Numerical simulations show that the proposed controller, which combines the virtual structure approach with backstepping method, can achieve formation flight easily.
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Hiroaki YOSHIMURA, Akihito TAGUCHI, Satoshi WATANABE, Yasunobu NUMAOI
Article type: Article
Session ID: 3318
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We investigate optimal trajectory design for a two-dimensional space robot floating in space. The movement of arms of a space robot induces attitude changes of the base body called the so-called geometric phase and we illustrate that the optimal solution of minimizing the hand trajectory and of removing the final attitude change of the base body is to be a circular path. Then, we propose some ideas for trajectory generation from the view point of variational problems. We examine numerical experiments for the optimal trajectory design.
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Takehiro HIGUCHI, Seiya UENO
Article type: Article
Session ID: 3319
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The capturing strategy to capture the debris in the earth orbit is one of major concerns of recent space development. The space debris is hard to capture because of their severe environment and the complex motion due to the malfunction in their stabilization system. This paper discusses about control law to follow the periodic rotating motion of debris. The control law used in this study had problems following the debris with large motion and also there was a problem with the speed of convergence to the stable state. The radius of the periodic motion is changed during the control to improve these problems to make the control law useful. The result shows that the maximum radius of the end-effector has risen higher than 3 times as big and speed of convergence has risen up to 6 times as fast.
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Seiya UENO
Article type: Article
Session ID: 3320
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper discusses on the control law for variable geometry truss (VGT) as space manipulator required to capture space debris. The end of truss is constrained to move periodically. The motion is simulated to synchronize trajectory of malfunctioned satellite, which is usually spinning or tumbling. Control law is also required to reduce energy consumption because of limited resources in space. The control law is derived from the locally optimal condition of minimum energy problem with periodic constraints. The simulation results show that circular motion of the end-effecter has faster convergence property than linear motion.
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Yoshihide Aoyanagi, Tatuhiro Sato, Takatoshi Iwamoto, [in Japanese], A ...
Article type: Article
Session ID: 3321
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The CanSat project was conducted by undergraduate students who had designed and fabricated a small experimented module called "CanSat". The CanSat was launched by a CAMUI-type hybrid rocket up to the height of 330meters. The CanSat was ejected from the rocket by the releasing mechanism that was installed inside the fairing of rocket, and fell down safely by using a parachute.
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Masahiro YANAGISAWA, Yousuke ONDA, Nobuaki KINOSHITA, Hisayuki NAKASTU ...
Article type: Article
Session ID: 3322
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We had developed a CubeSat named SEEDS (Space Engineering EDucational Satellite) since 2001, and finished the development last September. We exported SEEDS to the California Polytechnic State University (Cal Poly) which manages the CubeSat project. We conducted the acceptance test at Cal Poly this April, and SEEDS is now keeping in the clean room at Cal Poly. SEEDS is going to be launched with other fourteen CubeSats and eight small satellites from the Baikonur Cosmodrome in Kazakhstan at the end of this year. This paper dscribes the ground station, the mission analysis, and the current status of the launch mission.
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Atushi Oishi, Hitoshi Ikeda, Yousuke Tanaka, Tasuku Wakatsuki, Hiroshi ...
Article type: Article
Session ID: 3323
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Two satellite projects named QTEX and QTEX-PR are being advanced by Kyushu University now. QTEX was a small tethered satellite, and this project started by the students in Space System Dynamics Laboratory in 2002. QTEX has three missions, a proof of tether reel mechanism, an investigation of the tether survivability against space debris collision, and an experiment of orbit transfer technology by the tether cutting. QTEX consists of two similar satellites which named a mother and a daughter satellite, apart from an separation system and a tether reel mechanism in the mother satellite. We advanced the development of the daughter satellite in order to take hold a bus system of QTEX, and we named this daughter satellite "QTEX-PR". This paper will explain about QTEX-PR project.
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Shin Satori
Article type: Article
Session ID: 3324
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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An space engineering study group were built by staffs in Hokkaido Institute of Technology in 2000. The staffs were engaged in an electric engineering division and a mechanical engineering division. The programs of the study group consist of designing small satellites and developing small hybrid rocket together with Prof. Nagata 's group of Hokkaido University. Students of the small satellite groups were engaged in making CanSat and studying subsystem components of Hokkaido Satellite "TAIKI" together with companies' engineers. Their skills were trained in such a practical manner.
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Daigaku IGARASHI, Kosei ISHIMURA, Mitsuo WADA
Article type: Article
Session ID: 3325
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Hokkaido satellite is the small satellite which is being developed in Hokkaido. In this paper, the attitude determination system based on the Kalman Filter is designed for the Hokkaido satellite. The satellite has an earth sensor and IRU. The earth sensor outputs roll and pitch angles. Focusing on coupling between roll and yaw axes in kinematic equation of earth observation satellites, the attitude determination system is designed to estimate roll, pitch and yaw angles using roll and yaw angular measurements and IRU. We estimate accuracy of sensors to satisfy Hokkaido satellite's requirement. As a result, it is confirmed that designed attitude determination system satisfies Hokkaido satellite's requirement, ±1[deg], by using angular velocity sensors of private manufacture.
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Etsuji YOROZU, Hiroshi OKUBO
Article type: Article
Session ID: 3326
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper investigates the feasibility of using control moment gyros (CMGs) as the actuator for agile attitude maneuvers of a small satellite. A prototype of miniature sized single-gimbal control moment gyro (SGCMG) has been developed in the laboratory. A cluster of four prototype SGCMGs has been investigated by numerical simulations for full-three-axes attitude control of a CUBESAT class micro-satellite.
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Yasutada ABE, Yutaka WADA, Masahisa HANZAWA, Fumio TOHYAMA, Student Ro ...
Article type: Article
Session ID: 3327
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Burning characteristics of a few kinds of hybrid rocket propellant grains were investigated using two different sized rocket engines, both of which employed nitrous oxide N_2O as oxidizer. Regression rates of PMMA, HTPB and wax were measured and compared one another by a series of tests of a 20N class micro-hybrid engine. From these experiments, regression rate of wax fuel is larger than 2 times compared with other conventional fuel grains. A 300N class engine was mainly used to measure the combustion characteristics of liquid N_2O/wax combination.
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Hitoshi NOBATA, Yutaka WADA, Masahisa HANZAWA, Fumio TOHYAMA, Student ...
Article type: Article
Session ID: 3328
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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A hybrid rocket with new engine that had developed by students themselves was launched at 13:55 (JST) on 13th March 2005 at the Taiki-cho launch site, Hokkaido and the experiment was mostly successful. The rocket is 2.1m long, 10.2cm in diameter and 7.1kg in weight. Including payload instruments were non-gunpowder separation mechanism, telemeter, 3-axial accelerometer, altimeter, timer, flight computer and movie camera. Recovery parachute opened at 400m high and rocket system was safely recovered after 56 seconds after the launch. The new fuel of the engine was composed by microcrystalline wax and nitrous oxide which is safely and has high combustion efficiency. The wind direction and velocity were able to measure above 365m high from the ground, and student-tracking team tracked the rocket during the flight. In this paper, we report a result for rocket launches and our experimental experiences of rocket making and the management.
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Chihiro TAKANO, Yusuke MURAKI, Tsuyoshi TOTANI, Harunori NAGATA, Isao ...
Article type: Article
Session ID: 3329
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The experiments in which water as propellant is heated and ejected from the nozzle of the solar thermal thruster has been conducted. Thermal analysis of the solar thermal thruster and the propellant has been conducted These results indicate that the highest performance is achieved at a largest mass flow rate for a heat input, where propellant finish boiling at the entrance of the nozzle. Analytical result has indicated that the temperature distribution of the thruster was not ideal for heating propellant because of the heat lost at a nozzle. This is the problem to try to improve propulsive performance. It is possible that this problem is solved by using plug nozzle as a nozzle.
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Koji MARUYAMA, Yosuke UNO, Osamu KAWANAMI, Toshihiko HIEJIMA, Hisao AZ ...
Article type: Article
Session ID: 3330
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We have been developing a small non-combustion rocket considering safety. In general, students face danger in rocket projects because the rocket engine has the combustion process. Focusing on safety, economy and ecology, we study a non-combustion rocket engine using LN_2 and H_2O. LN_2 is for the propellant and H_2O is for the heating source. We call the engine CEES engine (Cryogenic, Economy, Ecology, Safety). We designed and developed a small rocket equipped with the CEES engine. On March 20^<th>, we launched the CEES rocket. As the result, the CEES rocket successfully reached about 60m high. The successful launch of the small rocket using non-combustion engine is the first in the world
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Akira NABAE, Kuniaki TOYODA, Tutomu UEMATU, Harunori NAGATA
Article type: Article
Session ID: 3331
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The launching project of a hybrid rocket has been conducted by the research stuffs in the universities in Hokkaido. The CAMUI (CAscaded Multistage Impinging-jet) hybrid rocket has been developed in Hokkaido university, and three launching tests of the rocket showed good results. As the next stage, we are developing a more powerful motor and arocket body to reach to 60km altitude. In the present study, we report the results of the wind test which was carried out to obtain the basicmaterials of the aerodynamic performance of rocket body models.
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