NASTRAN notes

Here are some edited notes given to me by a colleague who is writing software programs to import Nastran data into Matlab. DMAP DMAP (Direct Matrix Abstraction Programming) is the language running under the hood in the various nastran solution sequences.  All the math that happens… Read more

83rd Shock and Vibration Symposium, Tutorial Session

I will be presenting a 3-hour tutorial session at the 83rd Shock and Vibration Symposium in New Orleans, on November 4, 2012.  My session is called “Shock Response Spectra & Time History Synthesis.” Students will receive basic instruction in calculating shock response spectra for time… Read more

Pyrotechnic Shock Characterization Testing

Pyrotechnic devices such as linear shaped charge and frangible joints are used for stage and fairing separation in launch vehicles. These devices generate high-frequency mechanical shock energy. Avionics components mounted in the vehicle must be designed and tested to withstand this shock energy. Thus, ground… Read more

To be a Nahshon

The following is from the Midrash, a collection of Jewish stories and teachings which expand upon the Torah. When the Jews arrived at the Red Sea, with the Egyptian Army in hot pursuit from behind and the sea in front, there was an argument in… Read more