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Although several techniques of avoiding the moan noise are recently developed, analysis and design modifications are dependent on the case study and not systematic. In this study, the induced moan noise is analyzed in the coupled torsional beam axle (CTBA) suspension module with a proposed processing technique that lead to a reliable solution to prevent the moan noise. The signal of the moan noise is measured throughout the vehicle test considering the external conditions. The measured signal is analyzed its spectral characteristics with using a wavelet technique and two major spectra of the moan noise which is invisible only with FFT is successfully detected. Also a novel contribution analysis that is based on the frequency response function (FRF) is proposed to determine which component is more contributive for passing through the moan noise in the CTBA suspension module.

In chassis system vibrations, steering wheel vibrations such as shimmy, brake judder, high speed shake, and idle shake are partially affected by the vibrational characteristics of exciting sources, the suspension/steering system, and body structure. For the analysis of shimmy and brake judder vibration of the steering wheel, vector functions of exciting forces and transfer forces are classified for the vibrational mode shape analysis of the suspension system. The typical motions of a suspension system due to the kinematics and compliance stiffness are also investigated. In this paper, the sensitivity analysis of chassis system is suggested to reduce shimmy and judder vibration using vibration analysis of suspension elements. The DADS program is used with user defined routines for the descriptions of specific test conditions in sensitivity analysis and predictions of the vibration characteristics of a suspension system.