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Model Based Approach to Effectively Test Random Vibration for Reliability

Reliability testing is conducted on a product to measure/demonstrate product reliability over the period of time. Products used in automotive and automobile sector are simultaneously exposed to multiple stresses like thermal, vibration, power cycles etc. Hence Combined Stress Accelerated Reliability testing is carried out on a product to replicate field scenario, rapidly increase the product ageing, and see failures faster. However, the success of every combined stress accelerated reliability test is based on the effectiveness of creating the equivalent amount of damage that the product faces in field. This paper explains how to use Thermal cycling and Random Vibration in Combined Stress Testing effectively to replicate field damage by using fatigue damage spectrum [1], kurtosis [2] and identify an appropriate model to perform test data analysis and measure reliability.