Tom’s Video & Animation Files

Another work-in-progress… Step 1: Download a video file. Step 2: Play using VLC media player. * * * * * Launch Vehicles Delta 4 Heavy Launch Vehicle Shock Events Pegasus Launch Vehicle Linear Shaped Charge Test * * * * * Helicopters Chinook Ground Resonance… Read more

Sine Sweep vs. Random for Pre and Post Testing

Certain equipment must be designed and tested to withstand vibration.  This is common in the automotive, aerospace, military and other industries.    The equipment is typically mounted to a shaker table and then subjected to a base input random or sine sweep vibration test.   The random… Read more

Webinar Index

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

Nonlinear Modeling of Bolted Interfaces & Joints

Mechanical joints may have nonlinear damping and stiffness, due to.frictional slipping between the connected members, etc.  I am enclosing modeling advice from a colleague and related links. – Tom Irvine * * * If the nonlinearity stays fairly weak then there are a few options… Read more

Seismic Test & Analysis Webinars

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

Structural Dynamics Webinars

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