Using Experimental Modal Modeling Techniques to Investigate Steering Column Vibration and Idle Shake of a Passenger Car

850996

05/15/1985

Event
SAE Surface Vehicle Noise and Vibration Conference
Authors Abstract
Content
An experimental modal model of an early prototype car was constructed and validated against test results. The model was then used to suggest practical hardware modification alternatives which would: (1) shift the steering column resonant frequency away from the idle range, and (2) maintain a low steering column tip vibration within the 600-750 RPM idle range. This model was also used to evaluate the effectiveness of tuning radiator mounts to the overall vehicle idle quality.
It was found that a pair of braces from either the steering column bracket to brake pedal bracket or to the cowl top area could improve idle shake of the test vehicle. The driver side brake pedal brace alone is not effective. However, the passenger side brake pedal brace alone is as effective as the two brake pedal braces together. It was found that the radiator mounts on the test vehicle are extremely non-linear. Therefore, tuning the mount to improve idle quality is impractical. This study also illustrates that one model validation alone may not be sufficient to establish the adequacy of the model. Models which provide only “trends” during the validation stage may not be accurate enough for massive hardware modification predictions.
Meta TagsDetails
DOI
https://doi.org/10.4271/850996
Pages
20
Citation
Chiang, S., "Using Experimental Modal Modeling Techniques to Investigate Steering Column Vibration and Idle Shake of a Passenger Car," SAE Technical Paper 850996, 1985, https://doi.org/10.4271/850996.
Additional Details
Publisher
Published
May 15, 1985
Product Code
850996
Content Type
Technical Paper
Language
English