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
Launch vehicle and spacecraft equipment must withstand pyrotechnic shock from stage separation and other flight events. Civil engineering structures and equipment must survive seismic events. There are many other examples where military, automotive, telecommunication and other equipment must be designed and tested to meet shock… 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
Howdy! If you are interested in vibration fatigue please send me a reply. Email: tom@irvinemail.org I am creating a mailing list specifically for fatigue. Topics will include rainflow cycle counting, spectral methods, applications, etc. My current fatigue offerings are posted at: https://blog.vibrationdata.com/?s=fatigue&submit=Search Also, I am… Read more
Here is a paper: spectral_methods_MILHDBK5J.pdf Conference Version: 56663Irvine.pdf Conferences Slides: Irvine_Toulouse.pptx * * * The example problem in the paper was performed via the Matlab software posted at Matlab GUI package * * * See also Fatigue Damage for a Stress Response PSD Rainflow Fatigue Cycle… Read more