Test fixture resonance. Prior to test, a test fixture survey should be conducted to ensure that the structural characteristics of the test fixture do not introduce uncontrollable resonances into the test setup. The survey may be experimental or analytical. If problematic resonances are identified, modifications should be made to the test fixture to shift the resonance beyond the frequency range of the test or to dampen the resonance in order to minimize the effect on the test.
Ideally, the vibration test fixture should be designed to be: first, as light as possible and second, as stiff as possible. But in the real vibration testing world, there are a lot of constraint that we need to consider and then we need to find and optimum point, that can balance all required aspects such as cost, timeline, etc.
Computer-aided engineering (CAE) has long proven its value as a troubleshooting and analysis tool, but is generally perceived as slow, delivering accurate results too late to drive development. The simulation process with traditional CAE tools is slow due to tedious geometry cleanup processes, and simulation disciplines are disconnected from each other, hampering efficient workflows.
When we have a relatively small size and simple shape of UUT, with a simple mounting pattern, simple product orientation and low frequency test range, it will not be so tough to design a good vibration test fixture. But when we start to see one or more of below characteristics, then likely we will find designing vibration test fixture to be very challenging.
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