Search results for query: *

What numerical engine do commercial FEA codes use for modal transient analysis? The Newmark-beta method? I have posted a paper on a ramp invariant digital recursive filtering relationship for modal analysis at: http://www.vibrationdata.com/ramp_invariant/force_ramp_invariant.pdf Please let...

I have written a paper called: Shaker Table Seismic Testing of Equipemnt using Historical Strong Motion Data Scaled to Satisfy a Shock Response Spectrum It is posted at: http://www.vibrationdata.com/quake_syn.pdf I hope to present it at a conference although I have not selected one yet. I...

Can someone recommend a reference that gives formulas for analyzing the centrifugal twisting moment of a propeller blade with variable pitch? Thank you, Tom Irvine

Certain electronic components must be subjected to shock response spectrum testing, particular if the component must survive a pyrotechnic shock event while in service. (Refer to MIL-STD-1540, 810, etc.) I have an idea for a new type of shock test machine...

NEWS ALERT! Avionics components in missiles may be subjected to high-amplitude, high-frequency pyrotechnic shock pulses. The components must thus be qualified to these shock levels per MIL-STD-1540D, 810F, etc. The qualification levels often have so much margin that the tests must be...

I am trying to locate US Navy Design Data Sheet DDS-079-1. (I am assuming that it is unclassified). I have already tried NTIS and a number of Navy libraries. Please let me know if you can help find this document. Thank you, Tom Irvine

Here is an SRS code in Matlab. I have more of these types of programs for shock and vibration, so please let me know if there is an interest. Tom Irvine ****************************************** disp(' ') disp(' srs.m ver 1.4 January 31, 2005') disp(' by Tom Irvine Email...

Do you know of a paper about the variability in natural frequencies of finished automobiles? I can't find any references to it, but I'd like to order it somewhere. I think it was in the 1990's, and somebody actually tested about 170 similar cars to measure the first few fn's. Tom Irvine...

Number of references to FEA and FEA-related software as found on Monster.com jobs board on 5/17/01... Ansys 172 Nastran 92 Patran 68 SDRC Ideas 41 Pro/Mechanica 34 STAAD 30 Abaqus 27 Cosmos 24 Algor 6 LS-Dyna 5 FEMAP 4 Hypermesh 3 Packages must score at least 1 to be listed above. Tom Irvine...