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Paper Abstract and Keywords
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
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.
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
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

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  
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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Date Time 2014-01-31 13:35:00 
Presentation Time 25 
Registration for EMD 
Paper # IEICE-EMD2013-136 
Volume (vol) IEICE-113 
Number (no) no.425 
Page pp.1-6 
#Pages IEICE-6 
Date of Issue IEICE-EMD-2014-01-24 

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