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This paper describes one method for producing random 6-axis vibration within an accelerated test process to expedite design verification. The concept behind accelerated testing to identify failure modes and achieve product improvement is reviewed. The machine is presented as an alternative to existing technologies within the accelerated testing process. Together, the concept and machine are presented to engineers as a possible tool to verify new designs and discover non-intuitive failure modes prior to releasing a design for production. The theory of operation and the performance parameters of the machine are also discussed.

A method is presented to process random vibration data from a complete road durability test environment as stationary segments and then develop test profiles based on fatigue content of their power spectral densities. Background is provided on existing techniques for estimating fatigue damage in the frequency domain. A general model for stress response to acceleration is offered to address the vibration test's requirement for acceleration data and the fatigue prediction method's requirement for stress data. With these tools, the engineer can extend test correlation beyond failure modes to include retention of estimated fatigue damage. Recommendations allow for test time compression from editing and improve existing exaggeration methods.