Equipment must be designed and tested to withstand shock and vibration. Ideally, all equipment would be tested on a shaker table with six-degree-of-freedom control (three translations and three rotations). Such tables and control systems exist but are very expensive. Furthermore, any multi-axis testing requires careful… Read more
Here is a listing of the webinars and related materials. Matlab script: Vibrationdata Signal Analysis Package 1. Natural Frequencies 2. Sine Vibration 3. Sine Sweep Vibration 4. Random Vibration 5. Fourier transforms 6. Leakage Error, Hanning Window 7. FFTs 8. Waterfall FFT 9. White Noise… Read more
This is a work-in-progress… I am creating a series of webinars with Matlab exercises for seismic testing. Here are the slides. Telcordia Technologies Generic Requirements GR-63-CORE: Bellcore_GR_63_Core.ppt This unit contains an alternative waveform for VERTEQII. CEI.IEC 980, Recommended practices for seismic qualification of electrical equipment… Read more
You are welcome to participate in any of the following courses. I will teach shock & vibration course in Trieste, Italy on January 25-27, 2017. Course Link * * * I will teach a shock & vibration finite element analysis course in Singapore, February 13-15,… Read more
This is a work-in-progress… I am creating a series of webinars with Matlab exercises for structural dynamics and finite element analysis. Here are the slides: Unit 1 Basic FEA Unit 2 Damping Unit 3 Modal Analysis Unit 4 Transfer Functions Unit 5 Transient Analysis Unit… Read more
Figure 1. A320 Takeoff I recently flew as a passenger in an A320 similar to the aircraft shown in Figure 1. Figure 2. Time History Plots The takeoff vibration is shown in Figure 2 for the lateral and vertical axes. The aircraft went airborne… Read more
Years ago, I had the opportunity to perform hands-on shaker table testing, mostly for avionics components. That was a great learning experience. Alas, that opportunity has gone, but I am still involved writing software and providing training for test engineers. LDS was one of the… Read more
The NASA/JPL Environmental Test Laboratory (ETL) developed and built a tunable beam shock test bench based on a design from Sandia National Laboratory many years ago. ETL has been using this test system successfully since October 2008. The excitation is provided by a projectile driven… Read more
I have added batch processing as an option for time histories as shown above. I will add more options in upcoming revisions. The Vibrationdata Matlab GUI package is given at: Vibrationdata Matlab Signal Analysis Package Here are some sample input files for practicing batch processing: batch_sample.mat… Read more
An engineer recently asked me to recommended a vibration test level for his device, which would typically be mounted on a hospital table, including surgical tables. Well… shock would almost certainly be worse than vibration, particularly if the device were somehow accidentally dropped on… Read more