著者

後藤 陽一 細貝 英実 原 文雄 阿部 靖則 田中 祥夫

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.64, no.625, pp.3342-3347, 1998-09-25

被引用文献数

7

---

In-pipe flaw causes a failure in air conditioning pipe system, and to prevent the failure, in-pipe flaw must be diagnosed regularly. For the diagnosis of it, the type and size of the flaw are important information, and a pulsereflection method is usually used, because of its simplicity, where the type and size of in-pipe flaw have an effect on an amplitude of its echo. In this paper, to judge the type and size of in-pipe flaws, we used the two kinds of the amplitude information about the echoes. One is the amplitude of the echo that is reflected from the inner surface of the pipe with the flaws. The other is the amplitude of the echo reflected from the normal surface of the pipe. We used wavelet analysis to obtain the amplitude information about the echoes in the ultrasonic pulse reflected. We showed the results of the in pipe flaw diagnosis by using a test pipe with the artificial flaws on its inner surface and classified the results of flaw diagnosis in three types. Finally, we proposed an estimation method of the size of the in pipe corrosion with some experimental results.

著者

浅見 敏彦 桃瀬 一成 細川 〓延

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.566, pp.p2962-2967, 1993-10

被引用文献数

3

---

This paper proposes an expression for design of optimal dynamic absorbers attached to damped linear systems. The classical expressions were derived from the assumption that the primary system has no damping. There are two optimization criteria in the design of the dynamic absorber : the fixed-points theory and the minimum variance criterion. In the fixed points theory, the dynamic absorber is optimally tuned and damped with respect to the primary system so that the two resonant amplitudes of the main mass are equal. In the latter criterion, however, the area under the power spectrum density curve of the main mass is adjusted to take the minimum value. The new expression proposed in this paper is based on the minimum variance criterion. A perturbation method is used to obtain the expression, and the accuracy of the perturbation solution is discussed.

著者

西原 修 松久 寛

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.63, no.614, pp.3438-3445, 1997-10

参考文献数

6

被引用文献数

9

---

Fixed points design methods for dynamic vibration absorbers are very well-known in the field of vibration control and commonly applied for practical absorber design. However, they must be understood to be approximation methods from the point of view of their design criterion that the resonance amplitude magnification factor is minimized. In this study, the exact algebraic expressions of optimum tuning and damping parameters for the minimization of the largest resonance amplitude magnification factor of linear dynamic vibration absorbers have been derived for undamped primary systems. The existence of two equal height resonance points is reduced to a multiple root condition of an algebraic equation. The determinant is handled as an equation with respect to the resonance amplitude. It has became very clear that the fixed points theory design by Brock is highly accurate. In particular, it exhibits very small error in the practical mass ratio range, e.g., below unity. Algebraic solutions also exist for the resonance frequencies and the anti-resonance frequency. A numerical extension of the method is introduced in order to investigate the optimization problem for damped primary systems.

著者

浅見 敏彦 細川 〓延

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.61, no.583, pp.915-921, 1995-03-25

参考文献数

15

被引用文献数

5

---

This paper proposes an expression for design of optimal dynamic absorbers attached to damped linear systems. The classical expressions were derived from the assumption that the primary system has no damping. There are two optimization criteria in the design of the dynamic absorber : the fixed-points theory and the minimum variance criterion. In the fixed-points theory, the dynamic absorber is optimally tuned and damped with respect to the primary system so that the two resonant amplitudes of the main mass are equal. On the other hand, in the latter criterion the area under the power spectrum density curve of the main mass is adjusted to take the minimum value. The new expression proposed in this paper is based on the fixed-points theory. However, there are no fixed points in the resonance curves of the damped linear systems, so the analytic procedure becomes impossible. Therefore a perturbation method is used to obtain the expression, and the accuracy of the solution is discussed.

著者

新宮 正弘 江口 清 山海 嘉之

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.76, no.772, pp.3630-3639, 2010

参考文献数

24

被引用文献数

1 4

---

Polio survivors with severe limb paralysis cannot move their limbs voluntarily because they have a significantly reduced number of motor neurons due to the poliovirus infection. There is a danger that their ability to control their neuromuscular system, in particular fundamental abilities such as balancing flexors and extensors in the neuromuscular system may decrease dramatically in the long-term. If such polio survivors could improve their ability to balance, it would be possible for them to use the "Robot Suit HAL" wearable movement support device. HAL anticipates its wearer's intended movements through the measurement of bioelectrical signals, and generates assistive torques to support their movements. This study proposes a biofeedback training method using visual information, with the objective of restoring motor functions using HAL. A biofeedback system that feeds-back bioelectrical signals visually was developed, and tested with a polio survivor. The polio survivor was able to adjust the balance of their muscular control through the proposed training method, and voluntary motion was recorded to a paralyzed knee using a single-joint type HAL. These results suggest that polio survivors who have been paralyzed for a long time may improve their ability to control their neuromuscular system by using the proposed training method.

著者

橋場 邦夫 寺尾 憲 久納 孝彦

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.64, no.620, pp.1339-1346, 1998-04

被引用文献数

9

---

The theory of squeeze film pressure and the theory of acoustic radiation pressure have been generalized to a new theory in this study. When the two fiat faces are separated by a compressible fluid film, a dynamic pressure is generated in their normal direction by the oscillation of the faces. One of the authors derived a fundamental equation for the phenomenon considering both the inertia and the viscosity of the fluid. In case of neglecting the inertia effects and assuming the isothermal change, the equation is reduced to the Reynolds equation used in the conventional lubrication theory. In this paper, an analytical solution of the Reynolds equation on the adiabatic squeeze film is presented. The results show that compressibility effects of the fluid are dominant at high squeeze numbers. The relationship between the squeeze film pressure and Rayleigh radiation pressure is also investigated theoretically.

著者

佐藤 凖一

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

参考文献数

32

著者

田原 誠 野波 健蔵

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.78, no.787, pp.872-882, 2012

被引用文献数

3

---

Recently, Quad-rotor type helicopters which are representative of Multi-rotor type helicopters have been extensively developed over the world. The Multi-rotors are expected to replace Single-rotor type helicopters as an industrial helicopter because of their simplicity of the structure and good maintainability. In this paper, we focused on the operation problems of previous industrial helicopters and applied the Multi-rotors by a generalized design method. The generalization of the design method is performed considering variation of requirements of airframe specifications. In addition, we considered using commercial components rather than customized components in each process, so we achieved cost reduction compared with previous study. At first, we introduce the required specifications of a small pesticide application in this study and present the airframe design method. And then, we tuned parameters with presented simulation model and implement a multi-rotor type helicopter following the design method. Finally, we show the flight result and present the effectiveness of the design method.

著者

杉山 博之 小林 信之

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.66, no.642, pp.398-405, 2000-02-25

被引用文献数

3

---

This paper establishes a new formulation strategy of the flexible beam with large rotation motion. The finite element based formulation, that is previously presented for the analysis of the 'Spaghetti Problem' by authors, is extended to realize the low order and high accuracy beam model using a kind of Component Mode Synthesis Method. The deformation of the flexible beam is modeled by the combination of static mode represented by the shape function and the analytically evaluated both end clamed dynamic mode with respect to the local coordinate system. Body attached local coordinate system satisfies that x-axis of it connects both-ends of the beam. To demonstrate the efficiency and the validity of the flexible beam model in Multibody Dynamics, a 2-link flexible robot arm is modeled as the flexible multibody system consists of some rigid bodies and two flexible beams. The validity can be indicated by good agreements between the numerical simulation and the experimental results.

著者

小菅 一弘 奥田 実 福田 敏男

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.59, no.563, pp.2162-2168, 1993-07-25

被引用文献数

2

---

This paper discusses design issues of a manipulator/vehicle system floating on water, which consists of a vehicle controlled by thrusters and a manipulator mounted on it. The design of the system is very important for the control of such a system, because the controllability of the system is largely affected by the design of the system. In this paper, we propose a method to design the location of thrusters based on the concept of Translatability and Rotatability of the vehicle by actuators. The translatability (rotatability) of the vehicle represents the relationship between the output forces of thrusters and the equivalent force (moment) evaluated at the centroid of the vehicle. We first derive the relationship and then reveal that the equivalent force (moment) forms an ellipsoid. The method is natural in the sense that the force and the moment, which have dfferent dimensions, are dealt with independently. Examples illustrate the effectiveness of the proposed method.

著者

長屋 幸助 湯澤 秀人 村上 岩範

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.65, no.640, pp.4653-4659, 1999-12-25

被引用文献数

2

---

Since a commutator of the DC-motor is divided into a number of segments to have the torque in the circumference direction, the currents in the coils of the rotor vary and have alternative waves during the rotor rotation even in a constant input voltage. The currents become sharp waves, so that they have high frequency component. This implies that the rotor shaft and the case of motor are excited electromagnetic forces with high frequency components. Since high frequency noises are loud when they are input to human ears, so that when high frequency vibrations are suppressed, noises become small. From the situation, this paper discusses a method of noise reduction of Dc Motor. In the method, the current waves are controlled to be sinusoidal waves. The method and the control algorithm are given. In order to validate the method, experimental tests are carried out. It is proven that our method is applicable to the motor noise control.

著者

鈴木 智 野波 健蔵 酒井 悟

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.72, no.721, pp.2795-2802, 2006-09-25

被引用文献数

2

---

In this paper, we design a trajectory following controller by using model following based sliding mode control for small-scale unmanned helicopter. Firstly, we derive reference model that shows an ideal response. This reference model follows continuous trajectory like a circular trajectory without delay. Secondly, we design the model following based sliding mode controller that makes the response of real system follow the response of reference model. Lastly, we show the validity of the controller by the simulation and experiment.

著者

尾上 英雄 佐野 典秀 高橋 亮一

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.60, no.580, pp.4168-4174, 1994-12-25

---

It is important to. analyze the human task in sports such as tennis games. In this paper, a fuzzy tool for evaluating of tasks in a tennis game has been proposed based on a mathematical model and questionnaires issued to players themselves. The present method is capable of calculating human performance by summing up the fuzzy-measured PSF (performance shaping factor). This elicits the two dominant PSFs with a modified fuzzy measure learning identification algorithm (FLIA) to describe the ill-defined process of human activity in tennis games. FLIA reduces a set of PSFs until human tasks are represented clearly, and groupings of tasks are illustrated on a two-dimensional map of the dominant PSF. Characteristics of groups among players of different levels are then studied via the cluster analysis.

著者

小柳 志郎 吉岡 毅泰

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.53, no.492, pp.p1728-1734, 1987-08

---

The wavelength of hunting motion is one of basic quantities expressing the hunting motion characteristics of a railway vehicle. Though formulae for a single wheel-set and a rigid truck are well known, they are not applicable to a soft truck, in which horizontal suspension stiffness between the axle box and truck frame is small. In this paper, an approximate expression for the wavelength of a soft truck is presented and verified with measured data.

著者

河上 清源 田辺 秀敏 神蔵 貴久 永廣 健太郎 清水 浩 吉田 博一

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.72, no.719, pp.2123-2129, 2006-07-25 (Released:2011-03-04)

参考文献数

4

---

All wheel drive vehicles with in-wheel motors can control the yaw-moment of the vehicle by utilizing force distribution. When the power output of the in-wheel motor stops or the rotation clings, the vehicle becomes unstable by the unbalance of the right and left driving forces. The yaw rate and the lateral acceleration were measured when the motor broke down using an electric vehicle with in-wheel motors on all of its wheels. Not small influence was occurred on the test when the motor breaks down while accelerating. It was effective to stop the motor power output on the same axle when one of the motor broke down, Even if one motor were to break down, the control algorithm with high redundancy and safety features makes possible for the vehicle to keep running using the other motors.

著者

中尾 政之 石井 和久 佐藤 知正 畑村 洋太郎

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.61, no.583, pp.1021-1026, 1995-03-25

参考文献数

10

被引用文献数

7

---

In order to manufacture micromachines, development of micromanipulation is indispensable. This paper treats micro handling tools as end-effectors of a micromanipulation system, and introduces three prototypes of nontweezing tools : air-sucking, electrostatically charged, and surface-tensional ones. These three can handle microparts (l0 to 500 μm in length). In particular, they can perfectly release the microparts with several methods, such as ultrasonic vibration. Through theiractual usage, we confirm the validity of the tools for micromanipulation.

著者

谷水 義隆 杉村 延広 岩田 一明

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.65, no.632, pp.1725-1730, 1999-04-25

参考文献数

9

被引用文献数

3

---

In design and planning of manufacturing systems, a wide variety of models representing the manufacturing systems are required for simulation and verification from various viewpoints. These models are concurrently developed and applied to various application fields, therefore, a computerized support system is needed for concurrent development and consistency management of the various manufacturing system models. The objective of the research is to develop an object-oriented model repository aiming at supporting concurrent development and consistency management of the various manufacturing system models for production planning. Contents and structures of manufacturing system models are discussed from the viewpoint of the concurrent and hierarchical production planning problems. Model components and their relations to be stored in the model repository are proposed. A prototype of a model repository is developed and applied to the production planning problems.

著者

佐藤 栄作 宮本 昌幸 深沢 香敏 早勢 剛

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.59, no.566, pp.3123-3130, 1993-10-25

被引用文献数

1

---

Railway Technical Research Institute (RTRI) developed a bogie which has independently rotating wheels and is half as light as the conventional one, intended for the improvement of the stability of high-speed running on tangent sections and curving performance, and to render it available as a next-generation bogie on JR narrow lines. The performance of the bogie was tested on roller rigs and in field tests. From measurements, it has been verified that independently rotating wheels using a newly developed wheel profile have a gravitational restoring force and their performance met our expectations. From eigenvalues and results of simulation, the influence of the modeling level and that of the steering mechanism, on the running stability of the independently rotating wheels are clarified.

著者

小林 宏 橋本 卓弥 山崎 和広 平井 義和

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.76, no.764, pp.922-929, 2010-04-25

参考文献数

11

被引用文献数

1

---

There are many cosmetic companies and visual appreciation is undertaken by human expert though, skin texture has not been investigated quantitatively and automatically so far. In this study, image processing method for analyzing skin texture is proposed. Since sulci is very important for expressing skin texture, we apply cross binarization method for extracting sulci and by matching short lines onto sulci extracted, sulci is expressed by short lines. By analyzing short lines in terms of number, direction, and so on, quantitative indices are suggested for displaying feature of sulci. We then investigate whether it is available or not to predict visual appreciation score by quantitative indices. By using multiple linear regression analysis, we find that visual appreciation score is predictable in high rate by using quantitative indices we have proposed. This method comes into practical use since January 2009.

著者

井坂 秀治 西田 公至 齋當 建一

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.66, no.645, pp.1502-1508, 2000-05 (Released:2016-02-15)

被引用文献数

1

---

The purpose of the present investigation is to design an adaptive noise control muffler which has the most suitable location of secondary source. In the experiment, the distribution of sound pressure level in the muffler model has been measured by a sound visualization technique in order to obtain the maximum sound reduction by the minimum secondary sound under active control. The experimental results show that the target frequency could well be attenuated when the distance between the primary source and the secondary source is equal to the length eguivalent to one-half of the wave length of a target sound or its integral multiples.