Relationship between Mean Value and Fourier Coefficients of a Time-Varying Function with Half-Period Rests: Theory and Application

[+] Author and Article Information
Jun-Yao Yu

Department of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P.R. China

J. Vib. Acoust 116(1), 26-30 (Jan 01, 1994) (5 pages) doi:10.1115/1.2930392 History: Received August 30, 1991; Online June 17, 2008


The Fourier coefficients are investigated for such a periodic time function whose magnitude keeps constant during the time of every half-period. In this case the relationship between the mean value and the Fourier coefficients is achieved using appropriate mathematical theory. It was applied successfully to the study of torsional harmonic excitations due to gas pressure in a four-cycle IC engine. A formula relating the truncated Fourier coefficient series to MIP has been established with very little error. The series simulation of Fourier coefficients is utilized in the determination and analysis of excitations.

Copyright © 1994 by The American Society of Mechanical Engineers
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