Aircraft and launch vehicles behave as unconstrained systems in flight, with six rigid-body modes. These vehicles may be “trimmed” using aerodynamic control surfaces and thrust vector control to prevent rotation about the vehicle center-of-gravity (CG). There is a need to calculate the vehicle’s displacement response… Read more
This is a work-in-progress… The fatigue units are available to students who enroll in the Shock & Vibration course series. __________________________________________________________________ M.H.A. Bonte, A. de Boer, R. Liebregts, Prediction of mechanical fatigue caused by multiple random excitations: stress_psd_1.pdf Dr.-Ing. Marinus Luegmair, Dr.-Ing. Alexander Ziehl, Von Mises… Read more
The top figure is the time history from the El Centro earthquake, North-South horizontal component. The middle is the corresponding Waterfall SRS with 4 second segments and with 50% overlap. The bottom is the spectrogram. The Waterfall SRS is calculated by first taking the complete… Read more
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
I am trying to collect all my presentations. This is a work-in-progress… Thank you, Tom Irvine * * * * * * NAFEMS World Congress 2017 Introduction to Vibration Spectral Functions Random Vibration Vibration Fatigue Shock 1 & 2 Videos * * * * *… Read more
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
LA Times Article, Supersonic passenger jets might make a comeback, more than a decade after the last Concorde flight link Boom Technology Inc. – Tom Irvine
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
Hurt people, hurt people. That’s how pain patterns get passed on, generation after generation after generation. Break the chain today. Meet anger with sympathy, contempt with compassion and cruelty with kindness. Greet grimaces with smiles. Forgive and forget about finding fault. Love is the weapon… Read more