Test procedure for determining steering rack rattle

Details Test procedure for determining steering rack rattle Test procedure for determining steering rack rattle

2008-02-12

2010-06-22

Bhat, Aditya (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Performance or efficiency evaluation

C180S444000, C180S427000

Reexamination Certificate

active

07742899

ABSTRACT:
A method of determining steering rack rattle propensity of a rack and pinion steering assembly may comprise: simultaneously recording audio, and measuring acceleration of a rack, and right and left side tie-rod end loads; identifying rack rattle events from the audio recording; determining common characteristics of the measured rack acceleration and tie-rod end loads during the identified rack rattle events; creating a rack rattle index level; applying a predetermined force profile to a test rack and pinion steering assembly; measuring a test acceleration on the test rack and pinion steering assembly; calculating a test RMS level in a test frequency range using a test time constant; determining a rack rattle index value from the calculated test RMS level; and comparing the rack rattle index value to the rack rattle index level.

REFERENCES:
patent: 6550568 (2003-04-01), Ross

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