Wire rope damping depends on: 1. Material 2. Diameter 3. Length 4. Number of strands 5. Number of turns per length 6. Initial tension or preload 7. Displacement amplitude The damping can be very nonlinear, particularly depending on displacement amplitude. The flexing of wire rope… 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
Rainflow fatigue cycles can be easily calculated for a single-degree-of-freedom subjected to a sine or sine sweep base input. The reason is that each pair of consecutive positive and negative response peaks forms a half-cycle. The relative fatigue damage can then be calculated from the… 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
Here is a paper showing how fatigue damage can be calculated from a stress response PSD for a plate excited by an acoustic pressure field: acoustic_fatigue_plate.pdf The calculation method is given at: Fatigue Damage for a Stress Response PSD * * * The Matlab scripts… Read more
This Webinar unit shows how to perform spectral analyses on sound files using the Matlab & Python Vibrationdata packages. PowerPoint File: Webinar_sound_files.ppt – Matlab & Python Audio/Visual File: NESC Academy Sound File Processing – Recommend viewing in Firefox with Sliverlight Plugin * * * The sample… 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
I recently flew as a passenger in a CRJ-200 (aka CL-65) jet similar to the one shown in Figure 1. This aircraft has two General Electric CF34-3B1 turbofan engines, as shown in Figure 2. Here are the rotational speeds for each rotor. N1 Fan Speed… Read more