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| Presentation | 2014-01-31 13:35 An Evaluating Method for Fundamental Dynamical Parameters of Objects on a Printed Circuit Board(4) -- Natural Frequency and Damping Ratio -- Shin-ichi Wada, Keiji Koshida, Hiroaki Kubota (TMC System), Koichiro Sawa (Nippon Inst. of Tech.)  EMD2013-136 Link to ES Tech. Rep. Archives: EMD2013-136 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Authors have obtained the steady-state responses using theoretical inputs developed by Fourier series and the analytical outputs when input waveforms are sinusoidal and rectangular. Following the characteristics of input waveform, the kinetic nature of the system has the effects on the output waveform, which are remarkable in case of rectangular input. It has been shown that the time-sequential force, which is obtained by hammering oscillation mechanism, is approximated to delta function, and that impulsive response occurs by the force if the r value r (=τ/T) of rectangular waveform is smaller than 0.005. In this paper, they continue to analyze the response waveform by rectangular wave input. By the method in the previous study, they estimate natural frequency and damping ratio as fundamental dynamical parameters using transient and steady-state response waveforms by the external force. It is shown that the parameters depend upon the existence of connectors on the PCB, external force, and additional masses. And it is illustrated that time-sequential acceleration variations calculated by the estimated parameters have a lot of parallels with experimental waveform. Therefore it is shown that there are the dynamical parameters to be evaluated and the process of the degradation phenomenon of electrical contacts to be analyzed. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | electrical contact / micro-oscillation / contact resistance / natural frequency / damping ratio / hammering oscillation mechanism / / | |
| Reference Info. | IEICE Tech. Rep., vol. 113, no. 425, EMD2013-136, pp. 1-6, Jan. 2014. | |
| Paper # | EMD2013-136 | |
| Date of Issue | 2014-01-24 (EMD) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | EMD2013-136 Link to ES Tech. Rep. Archives: EMD2013-136 |
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| Conference Information | |
| Committee | EMD |
| Conference Date | 2014-01-31 - 2014-01-31 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | EMD |
| Conference Code | 2014-01-EMD |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | An Evaluating Method for Fundamental Dynamical Parameters of Objects on a Printed Circuit Board(4) |
| Sub Title (in English) | Natural Frequency and Damping Ratio |
| Keyword(1) | electrical contact |
| Keyword(2) | micro-oscillation |
| Keyword(3) | contact resistance |
| Keyword(4) | natural frequency |
| Keyword(5) | damping ratio |
| Keyword(6) | hammering oscillation mechanism |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Shin-ichi Wada |
| 1st Author's Affiliation | TMC System Co. Ltd. (TMC System) |
| 2nd Author's Name | Keiji Koshida |
| 2nd Author's Affiliation | TMC System Co. Ltd. (TMC System) |
| 3rd Author's Name | Hiroaki Kubota |
| 3rd Author's Affiliation | TMC System Co. Ltd. (TMC System) |
| 4th Author's Name | Koichiro Sawa |
| 4th Author's Affiliation | Nippon Institute of Technology (Nippon Inst. of Tech.) |
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| Speaker | Author-1 |
| Date Time | 2014-01-31 13:35:00 |
| Presentation Time | 25 minutes |
| Registration for | EMD |
| Paper # | EMD2013-136 |
| Volume (vol) | vol.113 |
| Number (no) | no.425 |
| Page | pp.1-6 |
| #Pages | 6 |
| Date of Issue | 2014-01-24 (EMD) |
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