著者

畠中 龍太 平田 荘周 大竹 理香 大西 崇文

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌 (ISSN:24242675)

巻号頁・発行日

vol.109, no.1048, pp.202-205, 2006-03-05 (Released:2017-06-21)

著者

森山 淳

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:18848354)

巻号頁・発行日

vol.77, no.778, pp.2389-2399, 2011 (Released:2011-06-25)

参考文献数

13

被引用文献数

3 2

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To clarify the overturning possibility of trains exposed to strong cross wind, several experiments were done to study the affect of the wind velocity and wind direction on the axle load changing. In this paper, the results of the experiment in the Japan Sea Coast Main Line, where the seasonal wind swept bitterly in winter, are described. Various kinds of trains, such as limited express, fright, commuter and local, were operated on the sites. To eliminate the turbulence of the wind on the sites, the 3 wind sensors were installed parallel with the track at regular intervals. As the results of the experiments, the author found that the ratio of wheel unloading caused by the wind could be more accurately expressed by the “Detailed equation” than the Kunieda's equation which was conventionally used to decide the regulation standard to prevent the train overturning by the strong cross wind in Japanese railways. Mesurement data also show that consideration of relative wind velocity and relative wind direction is important for running vehicle.

著者

堀畑 聡 新家 光雄 野崎 隆宏 赤堀 俊和 鈴木 亨 曽根 圭司 庭田 俊一 福田 徳久

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:18848354)

巻号頁・発行日

vol.79, no.803, pp.2240-2249, 2013 (Released:2013-07-25)

参考文献数

6

被引用文献数

1

---

Traditionally, the metal mouthpieces of trumpets have been generally made of brass. However, for musicians who suffer from metal allergies, the use of the mouthpiece sometimes lead to inflammation of the lip if they are taking part in a long performance. This problem can be solved by using allergy-free pure titanium (titanium) and its alloys as the material for the mouthpiece. Therefore, a titanium alloy composed of non-toxic and allergy free elements has been designed. However, because their heat conductivity is generally poor, and they contain α phase with its HCP (hexagonal closed packed structure having structure, which restrict slip systems, forming them into suitable shapes can be very difficult. Therefore, precision casting method, where only final finishing was conducted by machining, applied for fabricating the mouthpieces of trumpets. Important considerations for use in musical instruments are the material characteristics and the sound characteristics of mouthpieces made of titanium alloy. Research on the material characteristics of titanium alloy mouthpieces is currently being undertaken. On the other hand, the sound characteristics of mouthpieces made of titanium alloy have not been examined sufficiently. In this study, the sound and the vibration characteristics of two kinds of mouthpieces made of titanium and Ti-Nb was examined. The adaptability of these materials for use in mouthpieces of trumpets was discussed by comparing the sound characteristics of mouthpieces of trumpets made of titanium, Ti-Nb, and brass.

著者

松平 精

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌 (ISSN:00214728)

巻号頁・発行日

vol.77, no.667, pp.624-627, 1974

被引用文献数

2

著者

吉田 順 杉町 敏之 深尾 隆則

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:18848354)

巻号頁・発行日

vol.77, no.783, pp.4125-4135, 2011 (Released:2011-11-25)

参考文献数

15

被引用文献数

9 10

---

Energy consumption and CO2 emission are world-wide problems. In Japan, a new project for reducing CO2, called “Energy ITS project” has started since 2008 by NEDO (New Energy and Industrial Technology Development Organization). In this paper, a path following control method based on nonholonomic tracking control for autonomous drivinng of automotives is proposed to follow the determined path as accurately as possible. Path following control can treat the nonlinearities of the system, and it can follow the reference path more accurately. Different from tracking control, path following control separates velocity control and steering control. The performance of the designed control system which consists of a path following controller and a velocity controller is evaluated by simulation and experimental results.

著者

佐藤 勇一 三浦 秀一 辻岡 一明

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.694, pp.1566-1572, 2004-06-25 (Released:2011-03-04)

参考文献数

9

---

This paper describes the experimental and analytical study on the parallel orientation of pins by sinusoidal vibration. A pin with a point at one end and a small spherical head at the other on a horizontally vibrating table is oriented in the direction parallel to the vibration. As long as the vibration amplitude and its frequency are appropriate, reorientation phenomenon occurs. Analytical study shows that the orientation depends on the magnitude of the maximum vibration speed of the table, that is, amplitude times frequency. The sense of the orientation of a pin depends on the initial condition.

著者

品川 晃徳 野澤 久幸 内山 裕太郎

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 (ISSN:21879761)

巻号頁・発行日

vol.83, no.854, pp.17-00086-17-00086, 2017 (Released:2017-10-25)

参考文献数

4

被引用文献数

1

---

It is thought that the first step to understanding vehicle movement is to measure and analyze that movement in order to confirm that it falls within the range of the laws of physics. In the case of a four-wheeled vehicle, in general, the friction limit is defined within the circle of longitudinal acceleration and lateral acceleration through the use of a G-G diagram. Then measurements are taken to confirm that the driving state is within that range. Two-wheeled off-road vehicles are mainly ridden on slippery dirt roads that include steep slopes and rough, uneven surfaces. An analysis method for the driving state and the vehicle movement limits that would be suitable for analyzing the movement of such two-wheeled off-road vehicles under these conditions was examined. These movement limits were then formulated by taking into consideration the coefficient of friction and the road surface gradient in accordance with the basic laws of physics and also by focusing on the vehicle movement in the longitudinal direction. Measurements were also taken during actual off-road riding by top-class Japanese off-road motorcycle riders. It was confirmed that this measurement data was distributed within the range of the assumed vehicle movement limits. Consequently, it was confirmed that it is possible to use such measurements to accurately grasp the vehicle movement limits and the associated driving state for two-wheeled off-road vehicles.

著者

宇田川 洋一 鈴木 実

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B編 (ISSN:18848346)

巻号頁・発行日

vol.79, no.808, pp.2818-2825, 2013 (Released:2013-12-25)

参考文献数

22

被引用文献数

1 3

---

Ballast water is used to stabilize an empty ship on the open sea. It often contains various microorganisms such as plankton and bacteria, and causes serious damage to aquatic ecosystems when it is discharged. Ultra-high pressure underwater shock waves were applied to treat those microorganisms. The imploding detonation of propane-oxygen mixture was used to generate the underwater shock waves in a sample holder having an inner diameter of 10.9 mm. We investigated the imploding detonation wave in approximately hemisphere-shaped combustion chamber having maximum inner diameter of 60 mm and generated underwater shock waves of 100 MPa. As microorganisms of the high pressure treatment experiments Artemia salina, Heterosigma akashiwo and Coliform group were used. We could completely treat Artemia salina and Coliform group by 5 shots and Heterosigma akashiwo by 1 shot of the underwater shock wave that maximum pressure was about 100 MPa.

著者

小西 祐一郎 堀内 敬介 西原 淳夫

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 (ISSN:21879761)

巻号頁・発行日

vol.83, no.845, pp.16-00243, 2017 (Released:2017-01-25)

参考文献数

10

被引用文献数

2 1

---

In order to reduce thermal resistance of power module system, Thermal Interface Materials (TIMs) have been used at the interface between baseplate of power module and heat sink. TIMs have an important role to reduce thermal resistances due to solid surfaces with roughness or waviness. Thermal grease is a primary candidate to fill the gap between them. The grease can be pumped out of the gap during thermal cycling while the grease has the advantages of reduced cost compared to the other TIMs and TIM’s thickness. New reliability test of the grease is required for thermal management as the pump-out phenomena cause an increase of the thermal contact resistances. This study shows a visualization test method to evaluate pump-out phenomena of the grease during thermal cycling. A bimetal plate consisting of copper and invar is used to simulate thermal deformation of baseplate in power module. The grease is filled between the bimetal plate and Al thick plate, and then thermal cycling test is conducted. A 25 MHz ultrasonic imaging is used to visualize the grease layer. The ultrasonic images show a sequence of the grease behavior after the thermal cycling. The ultrasonic imaging results indicate that voids occur in non-curing grease under repeated pressure while cracks are detected in curing grease. It is also found that the curing grease layer applied in power devices can be designed by the evaluation of initial thermal contact resistances at the interface. Sensitivity analysis of correlated factors shows pump-out phenomena are strongly affected by curing of grease.

著者

上西 甚藏

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌 (ISSN:24242675)

巻号頁・発行日

vol.42, no.263, pp.99-103, 1939-02-01 (Released:2017-06-21)

著者

辻内 伸好 本家 浩一

出版者

一般社団法人 日本機械学会

雑誌

関西支部講演会講演論文集 2002.77 (ISSN:24242756)

巻号頁・発行日

pp._v-9_-_v-10_, 2002 (Released:2017-06-19)

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.1728-1734, 1987-08-25 (Released:2008-02-21)

参考文献数

4

---

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

原 祥尭 坪内 孝司 大島 章

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 (ISSN:21879761)

巻号頁・発行日

vol.82, no.834, pp.15-00421, 2016 (Released:2016-02-25)

参考文献数

14

被引用文献数

1 1

---

We propose a new Grid-based SLAM method with partial map matching for considering previous sensor data in Rao-Blackwellized Particle Filter. The partial maps are built probabilistically as accumulated scan shapes for each particle. In conventional Grid-based SLAM methods, Rao-Blackwellized Particle Filter is often used. However, the conventional methods sometimes fall into misalignment and fail to build proper maps in large or limited visibility environments. In those environments, the sensor data becomes insufficient shape to match with maps for localization since the sensor field of view is limited. It causes misalignment and failure in localization and map building. Rao-Blackwellized Particle Filter of the conventional methods is based on a Hidden Markov Model that uses only current sensor data to estimate robot poses. Hence, if the current sensor data is insufficient, it is difficult to estimate robot poses and build maps correctly. In our new method, the Hidden Markov Model has been extended to utilize a series of sensor data from the past in several seconds to the present. The series of sensor data is accumulated to make scan shape sufficient for the matching in localization. Thus, the proposed method is expected to cover the lack of sensor field of view by means of the accumulation of sensor data, and is capable of mapping in large or limited visibility environments. In our experiments at Tsukuba Challenge 2014 and Tsudanuma Campus, consistent maps were built only by the proposed method. Shape errors of the maps built by the proposed method were smaller than the conventional method.

著者

熊田 大輔 原 祥尭 坪内 孝司 皿田 滋

出版者

一般社団法人 日本機械学会

雑誌

ロボティクス・メカトロニクス講演会講演概要集

巻号頁・発行日

vol.2015, pp._2A1-V08_1-_2A1-V08_4, 2015

被引用文献数

1

---

This paper proposes road recognition using a laser scanner. In this study, road attributes are recognized by using a laser scanner is mounted on the robot. Road attributes are recognized using road surface shape and received light intensity that can be obtained by measuring a laser scanner towards the road surface. To recognize several road attributes using the two types of measurement data, feature values are calculated. And each road attribute is modeled by Gaussian distribution using the feature values within a certain range. Recognition the road attributes are based on the Mahalanobis distance between each model and the feature vector calculated from the measurement data. Using this method, We experimented at outdoor.

著者

新免 義彰

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌 (ISSN:24242675)

巻号頁・発行日

vol.44, no.293, pp.589-594, 1941 (Released:2017-06-21)

著者

下山 勲 三浦 宏文 光石 衛

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.49, no.444, pp.1372-1381, 1983-08-25 (Released:2008-02-21)

参考文献数

8

被引用文献数

5 6

---

竹馬形歩行ロボットBIPER-3の制御理論を発展させて,ロール軸及びピッチ軸まわりに人間並みの自由度を有する二足歩行ロボットBIPER-4の歩行実験を行った。BIPER-4の倒立振り子運動モードを利用したソフトウェアによる制御器が構成され,これを使って,足首部のトルクを小さくおさえるとともに一歩に要する時間が0.3秒程度の速い歩行が実現された。

著者

鯰江 一也 栗田 裕 松村 雄一

出版者

一般社団法人 日本機械学会

雑誌

Dynamics & Design Conference 2006 (ISSN:24242993)

巻号頁・発行日

pp._164-1_-_164-6_, 2006-08-06 (Released:2017-06-19)

---

This paper describes a transitional wave phenomenon in synchronous flashing of fireflies. We used self-excited oscillator, consists of amplification element, saturation element and phase delay element. To simulate a transitional wave phenomenon, the self-excited oscillator simulated the firefly shouldn't be late from the detection of the flashing of other self-excited oscillator. The period of self-excited oscillator in the transient state depends on strength of own flashing and changes. Strengthening strength of own flashing, perceived the flashing of other self-excited oscillators, the timing of flashing shifts and withdraws by correcting it at a constant period. This is a transitional wave phenomenon.

著者

田村 佑太 河口 篤志 濱崎 透 岡澤 重信 田中 智行

出版者

一般社団法人 日本機械学会

雑誌

設計工学・システム部門講演会講演論文集 2012.22 (ISSN:24243078)

巻号頁・発行日

pp._2106-1_-_2106-10_, 2012-09-26 (Released:2017-06-19)

---

Suspension analysis had been done for improvement of riding comfort. The analysis had the problem in the nonlinear characteristic modeling technologies of parts. We think that a rubber bush in the suspension which the analysis had not been so done in the present study. The mechanical character of rubber Bush is the rigidity different according to how to add power. It is character of velocity dependence that the rigidity is different according to the difference of the strain velocity. The rubber bush shape is circle and the fulid (oil) is contained in inside. In this study, we think that solid-fulid interaction analysis by FEM in order to reproduce the action of a rubber bush. We consider a vibration charactor of rubber bush and it is the purpose that we develop the computational model technology.

著者

下澤 楯夫

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌 (ISSN:24242675)

巻号頁・発行日

vol.109, no.1049, pp.257-260, 2006-04-05 (Released:2017-06-21)

参考文献数

7

著者

坂根 政男

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A編 (ISSN:18848338)

巻号頁・発行日

vol.77, no.779, pp.1078-1080, 2011 (Released:2011-07-25)

参考文献数

2