Design Modification for Reducing Silent Chain Annoying Noise

[+] Author and Article Information
M. Pan

National Central University, Chung-Li 320, Taiwan, ROC e-mail: pan_minc@cc.ncu.edu.tw

T. Shieh

Sanyang Industry Co. Ltd., No. 124, Shin-Ming Rd., Nei-Hu District, Taipei 114, Taiwan, ROC

J. Mech. Des 124(4), 822-827 (Nov 26, 2002) (6 pages) doi:10.1115/1.1485093 History: Received August 01, 2000; Online November 26, 2002
Copyright © 2002 by ASME
Topics: Noise (Sound) , Chain , Design
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The cab motorcycle to be developed, and the indication of measurement
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2-D dynamic signature analysis of annoying noise. (a) spectrogram of measured noise with microphone on the LHS of engine; (b) spectrogram of measured noise with the microphone 10 cm beyond the met-in; (c) rpm-spectrum of measured noise with the microphone 10 cm beyond the met-in; (d) spectrogram of vibration on met-in.
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SPL of order-14 silent chain noise along engine speed under different modifications
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The spectrogram of noise measured 10 cm beyond met-in, with gasoline tank removed. (a) adjuster spun back 1.3 mm by clockwise turning 1/3 round; (b) Morse silent chain applied (pressure angle 30 deg); (c) sandwich met-in structure.
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The mode shape of crown met-in at a resonance of 1650 Hz




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