1.Accidental Drop Shock 2.Half-Sine Shock on Drop Tower 3.Half-Sine Shock on Shaker Table 4.Waveform Reconstructions via Wavelets Slides: webinar_42_shock_topics.pptx Audio/Visual: NESC Academy Shock Special Topics – Recommend viewing in Firefox with Sliverlight Plugin * * * Matlab script: Vibrationdata Signal Analysis Package Data Sample: shaker_halfsine.txt -… Read more
The following is based on a description from Dennis Kern, NASA/JPL, which Isam Yunis, NASA Langley, referenced in a shock presentation. Shocks travel through structure as a combination of propagating waves and vibration response, with the vibration response concentrated more in lower frequencies and the… Read more
This Webinar covers two synthesis techniques 1. Wavelets 2. Damped Sinusoids PowerPoint File: webinar_27_SRS_synthesis.pptx Audio/Visual Files: Recommend viewing in Firefox with Sliverlight Plugin NESC Academy Wavelet Synthesis NESC Academy Damped Sine Synthesis * * * Matlab script: Vibrationdata Signal Analysis Package * * * See… Read more
This Webinar has two topics: 1. Aliasing in shock data 3. Saturation and spurious trend removal PowerPoint File: webinar_26_pyrotechnic_shock_part2.pptx Audio/Visual File: NESC Academy Pyrotechnic Shock II – Recommend viewing in Firefox with Sliverlight Plugin * * * Data: rv_separation_raw.txt – time (sec) & accel (G)… Read more
PowerPoint File: webinar_25_pyrotechnic_shock.pptx Audio Visual File: NESC Academy Pyrotechnic Shock – Recommend viewing in Firefox with Sliverlight Plugin * * * Data: rv_separation.dat – time (sec) & accel (G) * * * Matlab script: Vibrationdata Signal Analysis Package * * * Python version: webinar_25_pyrotechnic_shock_python.pptx Python… Read more
PowerPoint File: Webinar_24_Seismic_Shock.pptx Audio/Visual File: NESC Academy Seismic Shock – Recommend viewing in Firefox with Sliverlight Plugin * * * Data: elcentro_NS.dat – time (sec) & accel (G) * * * Matlab script: Vibrationdata Signal Analysis Package * * * Python Webinar_24_Seismic_Shock_python.pptx Python script: Python… Read more
PowerPoint File: Webinar_23_Classical_Shock_Pulses.pptx Audio/Visual File: NESC Academy Classical Shock Pulse – Recommend viewing in Firefox with Sliverlight Plugin * * * Matlab script: Vibrationdata Signal Analysis Package * * * Python Webinar_23_Classical_Shock_Pulses_python.pptx Python Signal Analysis Package GUI * * * See also: SRS Educational Animation See… Read more
Aerospace and military components must be designed and tested to withstand shock and vibration environments. Some of this testing occurs as qualification, whereby a sample component is tested to levels much higher than those which it would otherwise encounter in the field. This is done… Read more
Here is a sample SRS specification. The ramp is a constant velocity line with slope = 6 dB/octave. SRS Q=10 fn(Hz) Peak Accel (G) 10 10 2000 2000 10000 2000 Here is a set of files which satisfy the SRS. ASCII text: srs2000G.zip The files… Read more
Shock and vibration environments produce dynamic stresses which can cause material failure in structures. The potential failure modes include fatigue, yielding, and ultimate stress limit. F.V. Hunt wrote a seminal paper on this subject, titled “Stress and Stress Limits on the Attainable Velocity in Mechanical… Read more