著者

Yasuyuki YAMADA Junichi NAKATSUKA Toshio MORITA

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Mechanical Systems for Transportation and Logistics (ISSN:18821782)

巻号頁・発行日

vol.5, no.1, pp.110-119, 2012 (Released:2012-11-07)

参考文献数

13

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Passive dynamic walking requiring little exertion is one way of realizing efficient bipedal locomotion. In this case, forces should be converted only to shape ideas for the bottom leg, which naturally alternates the vibration of the roll and yaw axes. To achieve our objectives, in this study we focus on a spinning top, and the change in the direction of movement about the rotation axis was defined as irregular motion. It was shown that this method of realizing motion axis conversion occurred during rotation. An initial angular velocity is generated on the center axis of the solid body's curved surface, and changed the motion into a backspin. First, it was confirmed that we can accurately describe a half ellipsoid as a twisted solid curved surface on its center axis. Next we changed the contact point. By adjusting the angular momentum, we also showed the method of momentum vector conversion through friction. We extracted the constraint condition, and a translational direction element of the angular momentum vector was synthesized. Finally, we showed a method for converting the irregular motion into translational motion, so that the irregular motion can realize a twist angle and an ellipsoid shape.

著者

小泉 孝之 辻内 伸好 松原 真己 松山 幸司 相川 将隆 大島 裕子

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.77, no.777, pp.2018-2029, 2011

被引用文献数

1 5

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Structure borne noise is dominant in vehicle interior noise as frequencies below approximately 300Hz. Spindle force is a critical factor in structure borne noise for vehicle interior noise. To research the vibration characteristic of a rolling tire is essential for prediction of spindle force. This paper describes vibration analysis of a tire on the static and operational condition. Firstly, the surface vibration velocities are measured in the operational condition to comprehend the vibration behavior of a rolling tire using the scanning Laser Doppler Vibrometers. Secondly, the tire vibration model based on the cylindrical shell theory is build up. The basic equation, including the effects of the initial tension and the Coriolis force due to rotation, is derived by thin rotating cylindrical shell model and Hamilton principal. The results of the experiment and the theoretical analysis for a rolling tire are presented. Consequently, it is found that same shape of traveling-wave modes occur for a rolling tire, and the excited frequency of forward wave is different from that of backward wave. Finally, it is revealed that whether the rotation effect have affect on the vibration characteristics of a rolling tire.

著者

Sorapong PAVASUPREE Supachai NGAMSINLAPASATHIAN Yoshikazu SUZUKI Susumu YOSHIKAWA

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Solid Mechanics and Materials Engineering (ISSN:18809871)

巻号頁・発行日

vol.1, no.4, pp.459-468, 2007 (Released:2007-04-27)

参考文献数

29

被引用文献数

2 2

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This article has been found to be a duplicate publication of their article on another journal, and thus retracted by the Editor.

著者

畠沢 政保 杉田 洋 小川 孝廣 瀬尾 宜時

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.70, no.689, pp.292-299, 2004

被引用文献数

31

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A new type of thermoacoustic sound wave generator driven with the waste heat of a 4 cycle automobile gasoline engine is described. The exhaust-pipe connected sound wave generator, in which the hot heat exchanger is set in the exhaust pipe in order to recover the waste heat of exhaust gas, is proposed. A temperature of 780°C of exhaust gas in the exhaust is observed. In a conventional thermoacoustic sound wave generator, sound waves originate at a temperature of the hot heat exchanger, <I>T<SUB>H</SUB></I>, of 200-300°C and become sufficient at 700°C. It is confirmed that the new generator generates sufficient sound waves and its performance is almost equal to that of the electric heater driven generator at a thermal input of 300 W, which corresponds to slightly more than 1% of the heat quantity of exhaust gas provided under the condition that the number of engine revolutions is 2 600 r.p.m. and that the throttle opening is 35%.

著者

Xun CHEN Xue-nong DUAN Li-min WANG Yi-ping CHEN Dun-dun WANG

出版者

The Japan Society of Mechanical Engineers

雑誌

Proceedings of the International Conference on Power Engineering : ICOPE (ISSN:24242942)

巻号頁・発行日

pp._ICOPE-15--_ICOPE-15-, 2015-11-30 (Released:2017-06-19)

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Under the circumstances of different inlet air heating modes for thermal units with rotary air preheaters using flue gas denitrification, in order to perform the comparison and analysis on the outlet gas and air temperatures, the wall temperature of the heat storage element, and the influencing trend and variation patterns of acid corrosion area and ammonium bisulfate deposition area, the thermodynamic properties of the air pre-heater are calculated. Based on the thermodynamic model, the calculation are done on the air pre-heater of a 600MW power plant, with hot air recirculation mode and inlet air heating mode respectively. The results show that in the hot air recirculation mode, with the hot air recirculation ratio increasing, the average outlet wall temperature of the cold-section goes up, while that of the hot-section goes down. Meanwhile, with the acid corrosion area in the cold-section shrinking, the ammonium bisulfate deposition area ascends, which intensifies ash clogging in the air pre-heater. In the steam air heating mode, the average outlet wall temperature of the heat storage elements at both the hot and cold section increase, and the acid corrosion and ammonium bisulfate buildup areas descend simultaneously. Thus, for the air heater of thermal power units using flue gas denitrification technology and high-sulphur coal, the calculations for thermal check should be conducted for winter peak load scenarios, and the inlet air heating by steam air heater is more preferable to be applied in practice.

著者

Xun CHEN Xue-nong DUAN Li-min WANG

出版者

The Japan Society of Mechanical Engineers

雑誌

Proceedings of the International Conference on Power Engineering : ICOPE (ISSN:24242942)

巻号頁・発行日

pp._ICOPE-15--_ICOPE-15-, 2015-11-30 (Released:2017-06-19)

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The heat transfer performance of a tri-sector rotary air pre-heater was comprehensively investigated considering the influences of coal quality, flue gas flow rate, ambient temperature and load variation. By applying the standard of ASME PTC 4.3 with actual characteristics of the tri-sector rotary air preheater, an applicable index evaluation system for the tri-sector rotary air preheater was established. Combining the energy conservation principle and the parameters matching relationship of thermal systems, test methods of the corresponding key parameters were introduced. Finally, a typical application of the index evaluation system in the analysis and evaluation of the thermal performance and heat transfer effect of a retrofitted tri-sector rotary air preheater for a 300 MW unit was introduced.

著者

Sandi SUFIANDI Hiromichi OBARA Huai-Che HSU Shin ENOSAWA Hiroshi MIZUNUMA

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Biomechanical Science and Engineering (ISSN:18809863)

巻号頁・発行日

pp.17-00421, (Released:2017-12-04)

参考文献数

34

被引用文献数

1

---

Improving the process of cell injection during hepatocyte transplantation requires an understanding of the causal relationships that shear, direct contact cells with a solid surface, and cell deformation have on cell viability loss. A linear shear model was used to model this loss of cell viability during their movement on a solid surface as part of the injection step of hepatocyte transplantation. Rat hepatocytes were studied under linear shear using two parallel plates, with a ”tight” condition that had a 25 μm gap, and a ”loose” gap condition with a > 25 μm gap, to determine the effects of cell deformation, and simulate cell viability loss during injection. Cell morphology and deformation were also observed using time-lapse images. Direct contact with a solid surface is deleterious for cells, and live cells became deformed under shear stress until they lost viability. The cell size could decrease or increase during deformation, and a loss of viability could occur due to a loss of membrane integrity or cell rupture. The space limitations in the tight gap could prevent cell expansion, which delayed the process of cell viability loss. In summary, preventing the direct contact of hepatocytes with a solid surface is recommended to improve the cell injection process during transplantation.

著者

吉田 英生 石部 英臣 吉冨 聡 齋藤 元浩 松井 裕樹 江川 猛 岩井 裕 坪田 宏之 桑原 健雄 金丸 一宏

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.72, no.722, pp.2562-2569, 2006

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A hybrid bearing effectively stabilized by water evaporation from ultra-fine porous medium is proposed and its basic characteristics are clarified by numerical simulation and experiment. The proposed bearing aims to be applied to MGT (Micro Gas Turbine) and has mainly three advantages suitable for application to MGT. The first is the stability improved by water evaporation from ultra-fine porous medium. The second is the effective lubrication by liquid water at the start and stop of the journal rotation. The third is the cooling effect on the high-temperature journal due to water evaporation. A fundamental experiment from water lubrication to vapor lubrication via transition state has been carried out. The experiment indicated the potential of vapor lubrication and confirmed the stable start-up at water lubrication.

著者

Hisaji SHIMIZU Atsuhisa TAKEKOSHI Osamu TANIGUCHI Hiroshi KIMURA Ushio KAWABE

出版者

The Japan Society of Mechanical Engineers

雑誌

Bulletin of JSME (ISSN:00213764)

巻号頁・発行日

vol.15, no.88, pp.1299-1305, 1972 (Released:2008-02-15)

参考文献数

2

被引用文献数

1 2

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A superconductive magnet is generally thought unsuitable for a magnetic bearing because this magnet must be placed in liquid helium. The authors propose a new rotor-supporting system suing the strong magnetic field of a superconductive magnet. The experimental prototype was manufactured and its performances were evaluated experimentally and theoretically. The prototype consists of a cryostat, superconductive magnets, a rotor, mechanical auxiliary bearing, and so on. This newly devised cryostat can transmit an attractive force to a rotor which is placed in a normal temperature atmosphere. The bearing can suspend a rotor with hundreds of kilograms in the thrust direction using a mechanical auxiliary bearing in the radial direction. Besides, complete levitation is made possible when the currents of magnets are controlled automatically.

著者

藤原 宏樹 山内 和人

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.74, no.745, pp.2308-2314, 2008

被引用文献数

1

---

A logarithmic profile is an essentially optimal geometry for rolling machine elements such as bearing rollers and raceways. Under most conditions of loading, it yields less stresses to give longer endurance. Lundberg first suggested the basic profile, and some researchers followed him by modifying it to suit engineering requirements. The authors also proposed a mathematical optimization method for various profiles including a logarithmic one in roller bearing applications. In this paper, rolling contact fatigue life tests are carried out to make a comparison of logarithmic, standard partially crowned and modified partially crowned rollers when they are applied to cylindrical roller bearings. Results show that the logarithmic and modified partially crowned rollers are comparable in fatigue life, and outlast the standard partially crowed rollers if they are fully lubricated. On the other hand, under poor lubrication, the logarithmic rollers are found to yield outstanding fatigue life over the modified partially crowned ones.

著者

田中 正暁 佐郷 ひろみ 岩本 幸治 江原 真司 小野 綾子 村上 貴裕 早川 教

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.78, no.792, pp.1392-1396, 2012

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A study on flow induced vibration in the primary cooling system of Japan Sodium cooled Fast Reactor (JSFR) consisting of large diameter pipe and pipe elbow with short curvature radius ("short-elbow") has been conducted. Flow-induced vibration in the short-elbow is an important issue in design study of JSFR, because it may affect to structural integrity of the pipe. In this paper, unsteady flow characteristics in the JSFR short-elbow pipe related to the large-scale eddy motion were estimated based on knowledge from existing studies for curved pipes and scaled water experiments and numerical simulations for the JSFR hot-leg piping.

著者

Hiroyuki HIROYASU Toshikazu KADOTA Masataka ARAI

出版者

The Japan Society of Mechanical Engineers

雑誌

Bulletin of JSME (ISSN:00213764)

巻号頁・発行日

vol.26, no.214, pp.576-583, 1983 (Released:2008-02-15)

被引用文献数

13 67

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An algorithm for predicting heat release rate and pollutant emission in direct injection diesel engine has been developed according to the mathematical model mentioned in the first report. Predictions made with the simulation have been compared with the data on a single-cylinder engine over a range of engine speeds, injection timings and swirl ratios. Predicted pressure diagram, and NO and soot emissions showed acceptable quantitative agreement with the data. A parametric study of the effect of variations in load, speed, injection rate, injection timing, swirl ratio and droplet size is then carried out.

著者

舟木 治郎 渕 拓也 大西 祐介 長坂 繁弥 多久島 朗 佐藤 誠司 平田 勝哉

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.77, no.779, pp.2795-2804, 2011

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The present study is a fundamental approach to reveal the minute fluctuating pressures on three-dimensional blade surfaces of a basic propeller fan. Because, among the concerning physical quantities, the unsteady pressures on the rotating blades give us useful information for the fan flow and its sound-noise level. The authors correct the centrifugal-force effect, the gravitational-force effect and the other leading-error effects for accurate measurements of the minute pressures using a measuring technology developed by the authors (Hirata et al., 2009). As a result, we show the Reynolds-number effects and the spatial distributions on the blade of both time-mean pressure and pressure-fluctuation intensity.

著者

岩壺 卓三 越野 賢一郎 森田 篤

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.72, no.720, pp.2413-2418, 2006

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In this paper, the engineering evaluation method of the crucian fishing rods is performed. Principal component analysis and multiple regression analysis are performed to the results of the questionnaire about the performance of crucian fishing rods. As a result, the performance evaluation index "stiffness · strength", "weight", "top stop" are obtained and the performance evaluation equations of the crucian fishing rods are established. It is cleared that these equations are enough practical in the sight of degree of accuracy. Then, the design of crucian fishing rod is performed by using FE model. The design of the rod with targeted performance is become possible by solving the optimization problem setting the diameter of the rod as the design parameters and the Principal component score as the evaluation function. It is thought that these analysis methods are applied to the tailored design of fishing rod based on the sensory requirement of angler.

著者

Shinji TANIMURA Hiroyuki HAYASHI Terumi YAMAMOTO Koji MIMURA

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Solid Mechanics and Materials Engineering (ISSN:18809871)

巻号頁・発行日

vol.3, no.12, pp.1263-1273, 2009 (Released:2009-12-25)

参考文献数

19

被引用文献数

11 18

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Through intensive analysis of the tensile stress-strain curves of a variety of steel sheets over a wide range of strain rates on the order of 10-2 ∼103 s-1 obtained by using the Sensing Block Type High Speed Material Testing System, it was confirmed that the newly-partially extended constitutive model (Tanimura-Mimura Model) is useful to simulate the dynamic stress-strain curves for the entire range of deformation reaching as far as fracture over the wide strain rate range, as long as the quasi-static stress-strain curve of the material concerned is only known in advance. Dynamic tensile properties, over the wide strain rate range and the entire strain region reaching the true fracture strain, of ten kinds of aluminum alloys, which compose of a wide strength level from a commercial pure aluminum to the extra super duralumin are systematically studied. It was cleared that the aluminum alloys belonging to the one group exhibit the positive strain rate sensitivity and the aluminum alloys belonging to another group exhibit the negative sensitivity or almost non sensitivity. It was found that the values of the true fracture strain εf are substantially not affected by the strain rates, for all the tested aluminum alloys, and are closely related to the values of the tensile strength σB whose values are obtained by the quasi-static nominal tensile stress-strain curves.

著者

山本 利一 星野 孝仁

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.77, no.780, pp.3175-3183, 2011

被引用文献数

1

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The energy supply and demand balance being very unstable in Japan today, utilization of renewable energies as alternative for fossil fuels is an important issue. In this study through experiments in wave power energy conversion teaching materials for learning were developed, interest and concern were heightened and efforts were made to bring awareness of the issues closer to home. We were able to verify the students' gaining of a deeper understanding of energy problems and grasping of energy conservation concepts through the experiments in the classroom activities. The force of the wave is converted into the motion of the steel balls and the electricity is generated. This contrivance which the steel balls move quickly even in the case of the small wave has been made the equipment. The lessons practice was carried out using this teaching tool for junior high school students. In the experiment lesson, its results verified educational effect, showing that students gained higher awareness of energy issues and also were able to effect concrete instances of energy conservation that they were able to do themselves.

著者

木村 俊哉 川崎 聡 島垣 満 内海 政春 後藤 公成

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.78, no.787, pp.576-587, 2012

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CFD simulations were performed for the leakage flow in the gap between the casing and the shroud of a centrifugal impeller. The effects of swirl brakes equipped in the casing on the leakage flow were numerically investigated. The leakage flow swirling due to impeller rotation was trapped inside swirl brakes and interacted with the walls of the swirl brake, generating a very complex flow and a vortex structure inside. By the interaction with swirl brakes, the leakage flow rapidly lost its angular momentum mainly in the outer region of the swirl brake. The loss of swirl resulted in a decrease of the pressure difference in the radial direction due to the centrifugal force effect. The radial distribution of pressure in the gap between the casing and the shroud was largely modified, and thus the axial thrust force on the impeller was changed as well. The thrust balance of the impeller can be adjusted by an appropriate design of swirl brakes and the instability of rotating shaft can be reduced by decreasing the swirl of the leakage flow.

著者

NAKASHIMA Motomu ONO Ayako

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Biomechanical Science and Engineering (ISSN:18809863)

巻号頁・発行日

vol.9, no.1, pp.JBSE0001-JBSE0001, 2014

被引用文献数

17

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The objectives of this study were to solve computationally the arm stroke in the crawl swimming which maximized the swimming speed for different maximum joint torque conditions, and to investigate the maximum joint torque dependency of the crawl swimming with the optimized arm stroke. In the optimizing calculation, the swimming human simulation model, SWUM, was used for the simulation of the crawl swimming. The maximum joint torque characteristics, which were constructed in the previous study, were imposed as the constraint condition. In order to investigate the maximum joint torque dependency of the optimized arm stroke, four levels of maximum joint torque were prepared. The following findings were obtained from the results of optimization: The maximum swimming speed was realized by shortening the stroke cycle as much as possible although this shortening brought a lower propulsive efficiency as well as a lower stroke length. In a constant maximum joint torque condition, the swimmer does not push the water by turning the palm to the side in the latter half of the underwater stroke at the stroke cycle which brings the maximum swimming speed. The locus of the hand was relatively straight. At the slightly longer stroke cycle, the swimmer pushed the water until the end of the underwater stroke. The locus of the hand was still relatively straight. At the sufficiently longer stroke cycle, the swimmer also pushed the water until the end of the underwater stroke. The locus of the hand, however, became more curved and therefore became a so-called 'S-shaped' stroke.

著者

藤川 正毅 石川 清貴 真壁 朝敏 田中 真人 笹川 崇 表 竜二

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

2016

被引用文献数

5

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This paper proposes a novel implementation scheme of geometrically nonlinear finite element programs, which automatically compute exact internal force vectors and element stiffness matrices by numerically differentiating a strain energy function at each element. This method can significantly simplify the complex implementation procedure which is often observed in conventional finite element implementations, since it never requires B matrices, stress tensors, and elastic tensors by hand. The proposed method is based on a highly accurate numerical derivatives which use hyper-dual numbers and never suffer from any round-off and truncation errors. Several numerical examples are performed to demonstrate the effectiveness and robustness of the proposed method.

著者

大場 啓介 長嶺 拓夫 森 博輝 佐藤 勇一

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.81, no.824, pp.14-00593-14-00593, 2015

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This paper describes the investigations of the characteristic about the sound generation of a nose flute experimentally. The nose flute is attached to the upper part of a container. If air is passed to a nose flute, sound will occur. The volume of a container is changed and the generated sound is measured. The natural frequencies of an experimental device are calculated and we confirm that it is in agreement with frequency of sound generated in experiment. We show that nose flute is a unique musical instrument with the point that a nose flute has only an edge part and uses peoples mouth for a resonance body part. The frequencies of resonance sound can be calculated from the capacity in a mouth, the thickness and the area of an opening of a nose flute. When people play a nose flute, it is thought that only the first mode of vibration is used.