Buzz, Squeak, and Rattle (BSR)
Typically, there are three different methods used to evaluate for squeak and rattle issues on a MAST: Sine sweeps, road load, or random vibration. Each multi-axis table is equipped with accelerometer sensors which are used to sweep across a range of frequencies (generally within 2 – 50 Hz) at constant peak acceleration. Often times, road load data is collected for non-rough surfaces which can be used to simulate a (6) degree-of-freedom condition that would produce a BSR. Random vibration can also be used based on customer-provided frequency content or acceleration levels.
Noise, Vibration, and Harshness (NVH)
Evaluations conducted in the vehicle environment are limited by the background of that environment. Component level testing can be conducted in a “Quiet” test cell environment where the true noise of the test article can be measured. This “Quiet” test cell can be used to objectively measure the noises emitted from samples during their range of motion or with a vibration input. Random vibration profiles (PSD) based on vehicle data can reproduce the vibration environment without the noisy background. An Aachen head can also be used to record binaural recordings and simulate the local acoustic environment.
Natural Frequency/Modal Analysis
Natural frequency testing can be performed on any type of component or system-level part. Our equipment is capable of generating an acceleration input (vibration) or a force input (modal hammer) to the test piece, and analyzing the acceleration response to calculate natural frequency.
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Gas Tank Testing
Hot Exhaust Test on Shaker with Water Spray