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
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
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
Here is a loose collection of aviation articles that I have written over the years. Enjoy. aircraft_shock_vibration_acoustics.pdf Tom Irvine
Natural Frequencies of Composite Beams: compbeam.pdf A function for composite beams is included in: Vibrationdata Matlab Signal Analysis Package The function can be accessed via: >> vibrationdata > Miscellaneous Functions I > Structural Dynamics > Beam Bending > General Beam Bending, Composite Laminates Plates &… Read more
I made a recording of a bird in my backyard in Madison, Alabama. The bird was up in a tall pine tree, and I could not see it. But I was able to identify it from its song with the help of someone on the… Read more
Rocket vehicles mounted on launch stands at Vandenberg AFB, California must be designed and analyzed to withstand potential earthquakes originating on the nearby San Andreas Fault. The vehicles behave as long, slender cantilever beams prior to liftoff. * * * I am going to present… Read more