著者

桜井 康雄 門井 寛人 中田 毅 枝村 一弥

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.72, no.715, pp.991-996, 2006

被引用文献数

6

---

By developing various electronic equipments with high performance, the dissipated power of electric chips used in those equipments has been increased. Therefore, it has been important to cool those electronic chips, and a liquid-cooling system has been employed for some electronic equipments. An Electro-Conjugate Fluid (ECF), which is one of functional fluids, has a remarkable property that a jet flow is generated between two electrodes when a high voltage is applied to the electrodes. By the use of this strong jet flow, a pump with simple structure, no noise and no vibration can be developed and a new liquid cooling system by ECF seems to be realized. In this study, to realize the liquid cooling system by ECF, an ECF-pump is proposed, in which four printed circuit boards are layered to make the pump size compact. The proposed pump is fabricated, and experiments are performed to investigate the basic characteristics of the pump. Furthermore, in the liquid cooling system with the proposed pump, experiments to cools a heat source are performed to investigate the possibility of achievement of the liquid cooling system by ECF.

著者

菅野 隆 田所 諭 服部 元史 高森 年 小黒 啓介

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.62, no.598, pp.2299-2305, 1996-06-25 (Released:2008-02-26)

参考文献数

4

被引用文献数

5 7

---

An ionic conducting polymer gel film (ICPF) atuator is a composite of a perfluoro-sulfonic acid membrane sandwiched between platinum layers. Bending motion is induced by applying voltage between the surfaces in water or in wet conditions. This phenomenon was discovered in 1992. After reaching the maximum displacement toward the anode immediately, the actuator bent back to the cathode side, and approached the initial position gradually when a step voltage was applied. Current through the actuator decreased exponentially. The maximum displacement was proportional to the magnitude of the step voltage. Motion induced by a step current was almost the same as that induced by a step voltage but was slower. Voltage induced by the current increased gradually and reached a certain value, then increased once more to a steady voltage. The motion did not depend on the direction on the surface. The bending occured in all directions. Larger displacement was observed near the electrode. Dynamics of the actuator was expressed in terms of a 4th-degree transfer function by black-box linear modeling. Simulation results were in good agrrement with the experimental results.

著者

田中 直行

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.65, no.638, pp.4213-4215, 1999-10-25 (Released:2008-02-26)

参考文献数

4

被引用文献数

1 1

---

In the new method of calculating elliptical Hertz contact pressure described here, an elliptic integral is not necessary. Even the simplest numerical integration yields a Hertz contact pressure within 0.005% of the theoretical spherical contact pressure. Dimensionless parameters calculated using this method agreed well with the values given in the references. Elliptical Hertz contact pressure can thus now be calculated using a spreadsheet program for personal computers.

著者

山口 博明 新井 民夫

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.70, no.691, pp.774-781, 2004-03-25 (Released:2011-03-04)

参考文献数

6

---

This paper presents a novel path planning methodology using Bezier curves for a cooperative transportation system with two car-like mobile robots. We first transform the kinematical equation of this transportation system into two-chain, single-generator chained form in a coordinate system where a path is a curved line axis and a straight line perpendicular to the tangent of the path is another axis. The carrier of the transportation system can follow any path as long as its curvature is two times differentiable. The orientation of the carrier is uniquely determined according to the orientation of the tangent of the path. We secondly set the path to be a Bezier curve and we arrange the controlling points of the Bezier curve based on the working environment of the transportation system, e. g., in order for it to avoid collisions wit obstacles. The validity of this path planning methodology is supported by computer simulations.

著者

長南 征二 江 鐘偉 増井 慶次郎

出版者

日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.60, no.570, pp.p498-505, 1994-02

被引用文献数

1

---

Deformation control of a silicon-wafer slicer cutting a crystal ingot is studied analytically. The thin rotating blade is clamped at the outer boundary and prestressed in the radial direction, while the inner periphery is subjected to stationary, distributed in-plane and lateral slicing loads from the workpiece. The deflection of the blade is obtained analytically by introducing the multi-model expansion method, further applying the Galerkin method to the governing equations of the system. Numerical results are presented for an actual SUS 301 blade cutting a 6"-diameter silicon ingot at a speed of 1550 rpm. Two control schemes that maintain the flatness of the rotating blade are examined in detail. In the first scheme, a pair of concentrated lateral forces are applied to the blade to reduce the blade deflection. In the second scheme, a pair of moments are also applied to the blade to improve the flatness of blade. Simulation results obtained show that the application of control moment is more effective than the simple lateral forces to the improvement of flatness of the slicing blade.

著者

堀 光平 林 巌

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.60, no.579, pp.3940-3947, 1994-11-25 (Released:2008-02-26)

参考文献数

10

被引用文献数

1 1

---

Mechanical paradox planetary gears are suitable for power transmissions of current robots, such as space manipulators, which drive large-inertia loads, because the gears offer high reduction ratio, small size, light weight and high reliability. However, mechanical paradox planetary gears are subject to a drawback in that their efficiencies are lower than those of conventional planetary gears. The efficiencies of mechanical paradox planetary gears are hence theoretically analyzed and evaluated by defining the tooth number modification of a planet gear to deal with all the possible combinations of tooth numbers. The following results are obtained : the efficiencies are greatly influenced by the efficiencies of the planet and internal gear pairs ; the maximum efficiencies are minimally influenced by the reduction ratio, and they are obtained when the factors of the contact ratio of the gear pairs are approximately equal ; the maximum efficiency is approximately 78% if the tooth surface friction coefficients are 0.1.

著者

大舘 淳 岩原 光男 鈴木 芳 長松 昭男

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.72, no.718, pp.1751-1758, 2006-06-25 (Released:2011-03-04)

参考文献数

12

---

Recently, solving vibration problems in the prediction step is strongly required to shorten the development time. The purpose of this research is to clarify and improve vibration characteristics of products such as sporting goods by experiment and calculation. A familiar tennis racket was chosen and its vibration characteristics were investigated by actual impact test and experimental modal analysis. It was clarified that the largest vibration was generated at the first mode. Structural optimization of the simplified plate could diminish the peak by shifting the node of the mode to the excitation response point. Design variables were the masses given to the circumference or the thickness of elements.

著者

佐藤 建吉 白井 靖幸 赤坂 拓郎

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.74, no.746, pp.2429-2434, 2008-10-25 (Released:2011-03-04)

参考文献数

8

---

The working model of Brunel's atmospheric railway (BAR) was made and demonstrated at a museum event and a university festival event. The original system of BAR was run commercially in England for a year during 1847-1848. The driving system of BAR is very simple but there were many difficult problems in working service. In this paper, the authors made the working model of BAR to realize and show the Brunel's challenge : the driving mechanism, the design know-how, the dream and passion, etc. The all person played with and watched at the model enjoyed very much due to the running by a vacuum cleaner. The present paper describes the summary the detail of the model, such as materials, sizes and shapes, performance, problems, and further applications.

著者

皆川 佳祐 藤田 聡 遠藤 六郎 雨宮 満彦

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.75, no.752, pp.837-844, 2009

参考文献数

8

被引用文献数

1 2

---

In this study, vibration characteristics of mechanical structure having high natural frequency are investigated from the viewpoint of energy balance. Mechanical structures having high natural frequency in a nuclear power plant are generally designed statically and elastically. However it has been reported that fracture of ordinry piping is produced not by momentary large load but by cumulative fatigue damage. Therefore it is very imortant to grasp seismic performance dynamically by considering cyclic load. This paper deals with an investigation regarding seismic performance evaluation of high natural frequency mechanical structure. The energy balance equation that is one of valid methods for structural calculation is applied through the investigation. The main feature of the energy balance equation is that it explains accumulated information of motion. Therefore the energy balance equation is adequate for the investigation of the influence of cumulative load such as seismic response. In this paper, vibration experiment and simulation using sinusoidal waves and artificial seismic waves were examined in order to investigate relationship between natural frequency of structure and energy. As a result, we found that input energy decreases with an increase in the natural frequency.

著者

丘 華 久保 明雄 林 長軍 黎 子椰

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.70, no.690, pp.531-538, 2004-02-25 (Released:2011-03-04)

参考文献数

6

被引用文献数

1 1

---

In NC machining of noncircular contours, where cutter is fed along a straight line intersecting perpendicularly the roration axis of work piece, the cutter path usually consists of Archimedes's spiral segments. From machining precision and efficiency point of view, a desired cutter path should be composed of the fewer segments as possible under the condition of satisfying the specified interpolation error limitation. In this paper, an optimal interpolation principle of Archimedes's spiral for planar curves is presented and then a practical algorithm is constructed. The segment number of the cutter path resulted from the algorithm not only is the fewest but also the interpolation accuracy agrees with the specified value. It is also evidenced that the profile error of machined contour corresponding to the cutter path is perfectly controlled within the desired value, i. e. the specified interpolation error value, through detailed analyses. The interpolation results of using the presented algorithm for machining disc cam profile are compared with those obtained by Nishioka's methods (3) . The comparison results sufficiently confirm the validity of the algorithm developed by the authors.

著者

山藤 和男 越山 篤 三沢 智一 奥田 紳太郎

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.59, no.564, pp.2368-2375, 1993-08-25 (Released:2008-02-26)

参考文献数

8

被引用文献数

1 2

---

The authors have investigated a parallel bicycle-type mobile robot which has a controlling arm and a working arm. In the previous papers, control methods for postural stabilization and several kinds of motion and experimental results for this vehicle were reported, in which basic movements including driving, standing up and falling down as well as use of working using the working arm were shown. However, the working capability was insufficient because the former working arm was constructed of only one link. In this study, a new type of vertical two-link working arm constituting of an overarm (first link), forearm (second link) and hand (gripper)was developed. A newly devised double-clutch mechanism is installed on the joint between the overarm and the forearm. It can be switched using wire actuators made of shape memory alloy (SMA). With the use of the clutch, rotation of the forearm and the hand is realized by switching the electric current provided for the wire actuators. Gripping motion of the hand is also attained by use of another SMA wire actuator. With the three kinds of wire actuator, we developed a lightweight working arm. This paper describes mechanisms of the working arm and motion control methods. Experimental results for motion using the working arm and postural stabilization of the robot by the controlling arm are also given. It is confirmed experimentally that the inverted pendulum-type mobile robot with the working arm developed in this study shows potential for use in the new automonous land vehicle.

著者

山中 将 前田 英喜 井上 克己 張 新月

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.73, no.734, pp.2805-2810, 2007-10-25 (Released:2011-08-16)

参考文献数

11

---

This paper deals with the radiated noise of strain wave gearing, which is a kind of K-H-V type planetary gears having features of lightweight and high reduction ratio. The vibration of Flex Spline (F/S), which is the element of strain wave gearing and has a thin circular cup, is considered as a main factor of the noise. The magnitude of sound power is expected to become large in proportion to the square of the amplitude of displacement of F/S in the radial direction theoretically. The displacements of 3 kinds of models are calculated using FEM. The vibration of F/S and the sound power are measured using the F/S fixed type experiment apparatus. It is confirmed that the relation between the vibration of F/S and the sound power are agreed well to the theory and the vibration of the F/S causes the radiated noise mainly. Moreover, the radiated noise with changing a rotary speed, a loaded torque and an assembly error are measured and examined. The influence of rotary speed and torque is characterized by dependence of the deformation of F/S. The noise become large with the increase of the assembly error, but the amplitude of displacement is not increased. This is analyzed by a resonance between F/S and experiment apparatus.

著者

佐藤 準一

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.64, no.627, pp.4109-4114, 1998-11-25 (Released:2008-02-26)

参考文献数

32

著者

佐藤 祐 橋 弘矩 若林 雄介 永瀬 和彦

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.73, no.725, pp.59-65, 2007-01-25 (Released:2011-03-04)

参考文献数

8

被引用文献数

1 1

---

The authors proposed a new method which could easily and precisely detect the contact point position between the rail and the wheel under the critical condition of wheel climb derailment. As the result of the experiment using the above mentioned method, they found that the position was variously changed according to rail attack-angles and wheel lift-up values from the rail tread. The next, employing the contact point position, a new conception was proposed to theoretically calculate the wheel lift-up value from the rail tread when a wheel climb derailment occurred. Using a model track and a model truck, experimentation was done to examine the difference between the theoretically calculated value and the practically measured one on the wheel lift-up value. The result obtained was very much in agreement with the theoretically calculated value and the practical lift-up one.

著者

武藤 大輔 高野 靖

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.74, no.746, pp.2495-2503, 2008-10-25 (Released:2011-03-04)

参考文献数

5

被引用文献数

3 3

---

The dependence of transmission loss (TL) of a double-wall structure on the characteristics of the gases between the walls was investigated. The relationship between acoustic impedance, acoustic velocity, and TL was calculated by using the transfer matrix method. The results indicated that characteristics of the internal gases have two effects on TL. One is a change in the double-wall effect, and the other is a change in the reflection coefficient. Gases that have slower acoustic velocities or lower acoustic impedance than air increase the double-wall effect. Gases that have faster acoustic velocities increase the reflection coefficient. The calculated results for TL with air, helium, and carbon dioxide agreed well with experimental measurements. Finally, The rating of sound insulation (Rw) defined by JIS A1419-1 (ISO-717) was introduced, and the relationship between Rw and the characteristics of the gases between walls was investigated. The results indicate that gas with a low molecular weight and large ratio of specific heat is more effective to increase the TL.

著者

広瀬 通孝 石井 威望

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.51, no.471, pp.3153-3158, 1985-11-25 (Released:2008-02-21)

参考文献数

6

被引用文献数

3

---

A quantitative method to analyze mental work, such as programming or CAD operation, is discussed. The authors are proposing to define an index, named 'RRV', which is a variance of interval between successive R-spikes in E.C.G.(Electro Cardio Graph). In order to increase the measurement efficiency of RRV and to extend the time range of the measurement, a simple and handy-sized measuring unit is developed. From the result of experiments, it is proved that RRV is strongly connected with the condition of mental work. Under such intensive mental work as repetitive calculation for a long time, the value of RRV of the worker becomes lower than that under usual mental work. In addition, other basic characters of RRV, for example, the time-scale of its dynamic behaviour, are studied. Lastly, as a practical application, RRV is measured during computer programming, and several interesting phenomena are observed.

著者

佐藤 運海 竹ノ内 敏一 原 宏 山崎 隆夫 若林 信一

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.71, no.710, pp.3074-3080, 2005-10-25 (Released:2011-03-04)

参考文献数

7

被引用文献数

8 8

---

This paper describes development of end milling of carbon steel by electrolyzed reduced water of dilute sodium chloride solution, instead of conventional cutting with cutting fluid which is not environmentally consciousness. First, experimental equipments were built with a machining center, cutting fluid supply system made from the bath pump, temperature sensor and temperature recorder etc., and end milling processing of carbon steel was performed using electrolyzed reduced water of dilute sodium chloride solution and conventional cutting fluid respectively. Next, measured surface roughness, evaluated surface deterioration layer, temperature change of work piece and wear state of end milling. As the results of all evaluations above-mentioned, there is no difference between the end milling process using electrolyzed reduced water and that of conventional using cutting fluid. It is supposed electrolyzed reduced water instead of cutting fluid is environmentally consciousness process.

著者

横山 誠 Hedrick J.K. 外山 茂浩

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.67, no.657, pp.1449-1454, 2001-05-25 (Released:2008-02-26)

参考文献数

11

被引用文献数

8 8

---

This paper presents a new sliding mode controller based on the theory of model following control for semi-active suspension systems with Magnetorheological (MR) dampers which have undesirable nonlinear properties. In the proposed controller, a desired semi-active suspension system is chosen as the reference model to be followed, and the control low is determined so that an asymptotically stable sliding mode will occur in the error dynamics between the plant and the reference model states. The advantages of the proposed controller are : (1) measurement of the damping force is not required, (2) the reference model specifies the desired performance considering the passivity constraint of the damper, (3) it is highly possible to maintain the sliding mode and achieve high robustness against the nonlinear properties of the damper. Numerical simulations illustrate the effectiveness of the controller.

著者

安田 仁彦 神谷 恵輔

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.55, no.515, pp.1609-1615, 1989-07-25 (Released:2008-02-21)

参考文献数

21

被引用文献数

1 1

---

As a basis for developing an identification technique of nonlinear distributed systems based on their dynamical responses, an identification technique is proposed based on a simple example of nonlinear distributed systems. The example taken up is a simply supported beam vibrating with large amplitudes. The basic procedures of the proposed technique are: (1) measuring periodic responses of the beam to periodic excitations; (2) determining modal coordinates using the responses based on the modal functions of the corresponding linear beam; and (3) determining the modal equations including nonlinear terms using the principle of harmonic balance. Some numerical examples are given, and the technique proposed is shown to be applicable.

著者

山田 崇恭 西脇 眞二 伊賀 淳郎 泉井 一浩 吉村 允孝

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.75, no.759, pp.2868-2876, 2009-11-25 (Released:2017-06-09)

参考文献数

21

被引用文献数

1 2

---

In structural designs considering thermal loading, to control thermal stress and minimize decreases in material strength at high temperatures, it is important to maximize the thermal diffusivity of structures, in addition to the usual maximization of stiffness that optimal designs achieve. This paper presents a new level set-based topology optimization method for thermal problems with generic heat transfer boundaries in a fixed design domain that includes design-dependent effects, using level set boundary expressions and the Finite Element Method. First, a topology optimization method using a level set model incorporating fictitious interface energy is briefly discussed. Next, an optimization problem is formulated using the concept of total potential energy to address the design of mechanical structures that aim to minimize the mean temperature of the structure under thermal loading. An optimization algorithm that uses the Finite Element Method when solving the equilibrium equation and updating the level set function is then constructed. Finally, several numerical examples are provided to confirm the utility of the proposed optimization method.