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
Ring Laser Gyros Acronyms: IMU – inertial measurement unit INS – inertial navigation system RLG – ring laser gyro * * * An INS uses the output from an IMU, and combines the information on acceleration and rotation with initial information about position, velocity and… Read more
There are several tools for analyzing jet aircraft sound as measured on the ground. The measurements would typically be made for takeoff and final approach at or near an airport. Fly-over sound levels can also be recorded. The tools begin with the unweighted, one-third… Read more
This bridge, near the University of Alabama in Huntsville, was built so that pedestrians and cyclists could safety cross over the road. The support structures on either end have both stairs and gentle ramps. The bridge’s fundamental frequency is 2.2 Hz with 0.16% damping. The… Read more