In the design of driving systems, silent chains have extensively replaced roller chains thanks to annoying noise problems. For some types of cab-motorcycles, especially sheet-frame cabs, however, the annoying noise generated by silent chains is still not acceptable. In this study, silent chain noise of cab motorcycles is investigated first by order analysis and time-frequency (TF) analysis of measured noise, and second by the analysis of noise-origination, transmission and amplification via frame. The noise mechanism can therefore be precisely uncovered. Some experiments have been conducted to discover three primary issues of a noise problem, i.e., noise source, transmission path, and response. Additionally, a mode shape (1,3) at 1650 Hz can be constructed based on the running mode principle to interpret a dominant structure-borne noise.

Issue Section:
Technical Brief
Keywords:
flexible structures, design engineering, noise, engines, vibration control, resonance
Topics:
Chain, Noise (Sound), Engines, Design
1.
Mott
,
Ph.
, and
Martin
,
B.
,
1995
, “
Phased Chain System Quietly Transmits Power
,”
Automot. Eng.
,
103
(
12
), pp.
35
–
41
.
2.
Wang
,
K. W.
, and
Liu
,
S. P.
,
1991
, “
On the Noise and Vibration of Chain Drive Systems
,”
Shock Vib. Dig.
,
23
(
4
), pp.
8
–
13
.
3.
Hayashi, K., et al., 1987, “Analysis of Noise in Silent Chain Drives,” SAE paper No. 871199.
4.
McCarty
,
A. M.
, and
Stevenson
,
R.
,
1978
, “
Higher Load and Speed Limits for Silent Chain
,”
Mach. Des.
,
pp.
121
–
125
.
5.
Hogan
,
B. J.
,
1995
, “
Phased Chain System Squelches Transmission Noise
,”
Des. News
,
50
(
19
), pp.
143
–
144
.
6.
Pan, M.-C., 1996, “Nonstationary Time-Frequency Analysis in Condition Monitoring of Mechanical Systems,” Ph.D. Thesis of Katholieke Universiteit Leuven.
7.
Bandhopadhyay, D. K., and Griffiths, D., 1995, “Methods for Analysis Order Spectra,” SAE paper No. 951273.
8.
Pan, M.-C., 1999, “Investigation on Silent Chain Noise of X17 Cab Motorcycles,” Internal Report of Sanyang Industry Co. Ltd.
9.
Wallance
,
C. E.
,
1972
, “
Radiation Resistance of a Rectangular Panel
,”
J. Acoust. Soc. Am.
,
51
(
3
), pp.
936
–
945
.
10.
Dowell
,
E. H.
,
Gorman
,
G. F.
, and
Smith
,
D. A.
,
1977
, “
Acoustoelasticity: General Theory, Acoustic Natural Modes and Forced Response to Sinusoidal Excitation, Including Comparisons with Experiment
,”
J. Sound Vib.
,
54
(
1
), pp.
519
–
542
.
11.
Dimitriadis
,
E. K.
,
Fuller
,
C. R.
, and
Rogers
,
C. A.
,
1991
, “
Piezoelectric Actuators for Distributed Vibration Excitation of Thin Plates
,”
ASME J. Vibr. Acoust.
,
113
, pp.
100
–
107
.
12.
Cunefare
,
K. A.
,
1992
, “
Effect of Modal Interaction on Sound Radiation from Vibrating Structures
,”
AIAA J.
,
30
(
12
), pp.
2819
–
2828
.
Copyright © 2002
 by ASME
You do not currently have access to this content.