Specifying Fixtures for Dynamics Testing

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August 19, 2021

Fixturing can make or (literally) break a test, so we take it very seriously at Elite. During Dynamics, Vibration and Shock Testing, the device under test (DUT) must be securely mounted in its design orientation. Properly designed fixtures ensure rigid connection, accurate simulation, and minimal interference with the applied forces. On the other hand, poorly designed fixtures can distort, resonate, and artificially amplify forces that overstress the DUT – leading to avoidable test failures.

Our experts apply decades of testing experience to deliver fixtures with guaranteed performance and proven compatibility. We have done the research to determine the best materials and design practices specifically for dynamics testing. Our in-house design and fabrication shop is not your average tool room – we specialize in test fixtures to simplify this critical part of test planning for our customers. That is also why we start fixture specification early with the right questions:

  1. What is the size, weight, and quantity of DUTs?

Investing in a larger fixture for multiple DUTs often saves time and testing cost, especially when below 100 lb. We are equipped to fabricate fixtures up to 60” by 120″ to take full advantage our largest vibration tables. All 8 of our vibration tables also utilize the same bolt patterns to maximize interchangeability and scheduling flexibility.

  1. What is the DUT test orientation for each axis?

Using SolidWorks, we import solid models of the DUTs and design fixtures to accurately simulate mounting and orientation requirements. Parasolid, *.x_t, and *.stp files work best, and we can provide secure file transfer for all your models and drawings. We also employ 3D printing to quickly and cost-effectively accommodate complex DUT shapes and contours.

  1. Will the DUTs be powered or externally controlled during test?

When cable connections, cooling lines, and nearby support equipment are necessary, we ensure adequate space and fasteners on the fixture to simulate installation and minimize strain.

If you already have a fixture, our experts can help determine if it is adequate for the intended profile and modify it for compatibility with our test equipment.

When you choose Elite to design and build your fixture, you can be confident in its compatibility, and we guarantee its performance. Contact us today to take the 3 steps to successful dynamics testing with Elite.