Special Applications

Unholtz-Dickie is home to a variety of special applications including:

Vibration Time History Testing
High "G" Shock Testing
Accelerated Reliability Test Results

Click a topic below to read more.

Vibration Time History Testing

Vibration time history data, (as featured in "Sound and Vibration" October 99 issue) measured in various field environments, has been available for many years. The challenge facing test engineers has always been how to replicate these measured environments in the lab on a vibration test shaker system. This report covers one possible solution to this requirement.

High 'G' Shock Testing

UD announces a new family of "high g" shock test systems featuring the Model S092-UX Shaker rated up to 1,500 g pulse output.

Accelerated Reliability Test Results:
Importance of Input Vibration Spectrum and Mechanical Response of Test Article

Repetitive Shock ((RS) also known as pneumatic hammer) and Electrodynamic (ED) vibration systems produce substantially different vibration conditions at the input point to the test article. These differences are most evident in terms of peak G level and spectrum content.

The "RS" System produces vibration in short bursts which contain extremely high G amplitudes at the leading edge of each air hammer impact. The frequency content of the "RS" spectrum is non-uniform and exhibits many "holes" in the test spectrum.

The "ED" System produces a continuous vibration time history that contains peak G amplitudes that vary within a moderate, programmable range. The distribution of vibration energy over the test spectrum is uniform and easily programmed using accelerometer feedback (closed-loop) control.

Special Applications

Vibration Time History Testing

High 'G' Shock Testing

Accelerated Reliability Test Results:Importance of Input Vibration Spectrum and Mechanical Response of Test Article

Accelerated Reliability Test Results:
Importance of Input Vibration Spectrum and Mechanical Response of Test Article