著者

玉置 元 吉村 卓也 品川 貴志

出版者

一般社団法人日本機械学会

雑誌

Dynamics and Design Conference : 機械力学・計測制御講演論文集 : D & D (ISSN:13480235)

巻号頁・発行日

vol.2001, 2001-08-03

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It is important to get the objective evaluation of human sensation for vibration. The one of the methods is to use the vibration contour for human sensation standardized by ISO. It explains the relation between the frequency and the vibration level at a certain frequency range where the subject feels those vibrations in the equal strength. This study investigates the vibration responses of the human body at the equivalent strength to understand why they feel those vibrations equal. As a result, an average contour of plural subjects for human sensation becomes similar to the contour standardized by ISO. The conditions of human vibration change at about 10Hz.

著者

小林 賢一 山崎 徹 今福 健一 塩川 克久 伊東 圭昌 名倉 英紀 石上 さやか 中山 舞美

出版者

一般社団法人日本機械学会

雑誌

機械力学・計測制御講演論文集 (ISSN:13480235)

巻号頁・発行日

vol.2013, pp."509-1"-"509-11", 2013-08-25

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Most robot craft construction courses held by regional administrative organs are temporary events, so that it is very difficult to communicate between participants only in the event day. The purpose of our project is to construct the partnership among our small collaborations, such as small collaboration between NPO NPO-RIC and Kanagawa Univ, between Kanagawa Univ. and the after school daycare facility "Okaeri", and between Kanagawa Univ. and Trans Cosmos Ltd., and so on. In this paper, not only the robot craft construction course but also the process of collaboration among our organization with each different output are reported.

著者

廖 于靖 サブチェンコ マリア 萩原 一郎

出版者

一般社団法人日本機械学会

雑誌

機械力学・計測制御講演論文集 (ISSN:13480235)

巻号頁・発行日

vol.2014, pp."530-1"-"530-8", 2014-08-25

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In this paper we present a new approach in progress for generating the 3D surface mesh from a single image based on the cross-sectional approach. Moreover, the extraction of the contour of the input image and skeleton calculation have been proceed as the "Skeleton-Diagram" feature for generating the 3D surface mesh. The process employs the methods based on the image and geometrical processing. Finally, the application results show ability and prospect of the proposed method.

著者

長松 昌男 岩原 光男 御法川 学 曽我 明央

出版者

一般社団法人日本機械学会

雑誌

機械力学・計測制御講演論文集 (ISSN:13480235)

巻号頁・発行日

vol.2013, pp."253-1"-"253-7", 2013-08-25

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We have developed a converted noise localization method, Converted Nearfield Acoustic Holography (NAH) method. This method can measure high frequency noise source with short measurement time. However, this method has some deterioration in the reconstructed images. In this paper, the experiments results of measurements for an engine are explained. As a result, it is verified that the proposing method can measure high frequency noise of engines quickly.

著者

伊藤 直輝 中村 弘毅 山崎 徹

出版者

一般社団法人日本機械学会

雑誌

機械力学・計測制御講演論文集 (ISSN:13480235)

巻号頁・発行日

vol.2015, pp."528-1"-"528-10", 2015-08-25

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An electric guitar is composed of a wooden body, a wooden neck, 6 steal strings and other electric parts including an electromagnetic pickup. An electric guitar convert string vibration into electric signal through a pickup, and the sound is emitted with an amplifier, or a speaker. Usually, high density and high stiffness wood is used for body material to sustain string vibration longer and the sound remains. Also, it is reported that the material of a body influences the quality of the sound. Nonetheless, there are few studies focused on detail of vibration propagation between string vibration and sound. Authors have studied on the structure of traditional instruments to clarify the vibration characteristics especially from the aspect of vibration energy propagation model in recent years. Specifically, the vibration propagation characteristics of several instruments have been evaluated using SEA: the bridge structure and the sound post of violin, and soundboard of a piano. It is expected that SEA may also help understanding sound emitting process of a guitar. In this study, vibration energy propagation of two test guitars composed of different body material are observed with experimental SEA, to evaluate the influence of body material on the guitar sound. As a result, it has represented the difference between the guitar in the vibration propagation characteristics between the neck and body. The guitar which the Young's modulus of body materials has a big has a big sound pressure level. There is a strong correlation in the frequency characteristic of input power and sound pressure level.

著者

藤井 孝子 小山 由朗 加藤 久 平田 崇

出版者

一般社団法人日本機械学会

雑誌

Dynamics and Design Conference : 機械力学・計測制御講演論文集 : D & D (ISSN:13480235)

巻号頁・発行日

vol.2003, 2003-09-15

被引用文献数

1

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A design of foundation garments like a brassiere and a girdle is made to realize elegant bodyline and comfortable feeling of wearing. The know-how acquired by research and development of foundation was used and applied for design of walking assistance robot. The contact place of human body and robot was determined by measurement of expansion and contraction of the skin and the body form change by movement. In addition, to evaluate of a feeling of wearing, contact pressures were measured. In this result, it has checked that contact pressure was in agreement with sensory evaluation.

著者

柿森 亮昌 錦戸 亮太 勝 隆志 井上 喜雄 芝田 京子 王 碩玉

出版者

一般社団法人日本機械学会

雑誌

機械力学・計測制御講演論文集 (ISSN:13480235)

巻号頁・発行日

vol.2014, pp."130-1"-"130-7", 2014-08-25

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The aim of this study is to improve of stick picture using wearable motion sensor, in order to estimate human joint center and stride. Human joint center was estimated by least square method of sphere and marker points on the human arm were observed by motion analysis system (MAC3D System). First, as a basic experiment, instead of measuring human joint, we made use of a stick which has 490 mm length and two markers were affixed at the end of the stick. Next, it is hard to measure the movement of lower body, we performed an experiment on the movement of arm. As a result, estimated value by sphere method has a higher accuracy than estimated by circle. Finally, gait acceleration value was observed by acceleration sensor. Then, gait acceleration value had coordinate transform toward direction of movement and filtered by low pass filter. After, Gait velocity and acceleration were calibrated to 0 and integrated. In a result, stride was calculated with high accuracy. In this paper, it is shown that estimated stride and value of human joint center were calculated with high accuracy. To summary, these experiments, it is feasible that the accuracy of stick picture using wearable motion sensor is to be improved.

著者

森 裕介 田中 基八郎 渡邉 鉄也 戸田 富士夫

出版者

一般社団法人日本機械学会

雑誌

Dynamics and Design Conference : 機械力学・計測制御講演論文集 : D & D (ISSN:13480235)

巻号頁・発行日

vol.2000, 2000-09-01

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Triangle is a popular instrument of high frequency sound. But its generation mechanism of sound is not clear. In this paper, we investigated frequency characteristics and mode shape of vibration of the triangle, and measured distribution of sound pressure level around the triangle. As a result, we were able to make certain that those were closely related. Considering that hanging position is an important parameter of damping property, we experimented using a C type curved beam. We compared its damping result with that of the triangle.

著者

大下 裕樹 藤田 悦則 榎 芳美 我田 茂樹 中川 紀壽

出版者

一般社団法人日本機械学会

雑誌

Dynamics and Design Conference : 機械力学・計測制御講演論文集 : D & D (ISSN:13480235)

巻号頁・発行日

vol.2002, 2002-09-13

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Several vibration-isolating equipments with metal spring, air spring, rubber spring and an oil damper are developed. The purpose of this paper is to study the vibration and noise of the engine that is reduced by new mount-system (duffing's mount) using magnet-spring. At this study, an experimental device with the engine was created in order to measure the vibration and sound pressure level of the engine. The vibration was measured with acceleration pick-up and the noise was measured with sound level meter. In this study the new mount-system using magnet-spring was compared with rubber mount. The new mount-system using magnet-spring can reduce the vibration and solid borne sound of the engine rotation.

著者

稲垣 洋輔 香川 美仁 森川 広一 岩附 信行 林 巖 細川 俊之

出版者

一般社団法人日本機械学会

雑誌

Dynamics and Design Conference : 機械力学・計測制御講演論文集 : D & D (ISSN:13480235)

巻号頁・発行日

vol.2000, 2000-09-01

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This paper describes the optimization of the case cover of small hard disk drive (HDD) used for personal computers. Small Hard disk drives are one of the main causes of noise radiated from personal computers or workstations. Nowadays the rotational speed of spindle motor used to rotate disks is increased year by year in order to increase the transfer speed. It is afraid that the noise radiated from small HDD is increasing more and more accordingly. Optimization of the shape of ribs which are attached on the case cover are hence tried in order to reduce the noise radiated from small HDD used for personal computers. Firstly, the natural modes of flexural vibration of the case covers of small HDD, which were made of aluminum, steel, and brass, were experimentally determined, and the natural frequencies, mode shapes, and damping coefficients were determined. Secondly, the sound power radiated from the case covers was theoretically estimated dy using the results of FEM modal analysis, was made sure to coincide with the measured values. Finally, the sound powers radiated when the thickness of the case cover was uniformly thickened, and when radial ribs, lattics ribs, or circular ribs were attached on the case cover, were compared. As the results, it has been revealed that the sound power is more reduced as the thickness is increased, the increase of thickness is effective especially to the low modes. For attaching ribs, radial ribs were most effective, and the sound power was more reduced as the number of ribs and/or the height was increased.

著者

稲垣 照美 松井 隆文 安久 正紘 赤羽 秀郎 安部 宣男

出版者

一般社団法人日本機械学会

雑誌

Dynamics and Design Conference : 機械力学・計測制御講演論文集 : D & D (ISSN:13480235)

巻号頁・発行日

vol.2001, 2001-08-03

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Luminous patterns of firefly were experimentally investigated to evaluate the healing effect by using an appropriate statistical analysis and an image processing. A robot modeled for the firefly was further developed with the aid of the luminous patterns. This study is for fabricating a hospice space by which people can be healed from many kinds of stress due to various modern human activities. It is revealed from a series of measurements that 1/f^n fluctuation modes are also included in the lumminous pattern of firefly robot and that there is a possibility that the luminescence plays a significant role in healing people. Because, we have always been feeling that the luminescence is so attractive from ancient times.