PowerPoint Slides: Webinar_29_stress_velocity.pptx Audio Visual Files: Recommend viewing in Firefox with Sliverlight Plugin NESC Academy Stress-Velocity Relationship Part I NESC Academy Stress-Velocity Relationship Part II * * * Acceleration Time History: Time (sec) & Accel (G) srs1000G_accel.txt * * * References: Stress-Velocity Relationship: sv_velocity.pdf Bending Frequencies of… Read more
PowerPoint Slides: Webinar_28_mdof_SRS.pptx Audio/Visual Files: Recommend viewing in Firefox with Sliverlight Plugin NESC Academy Multi-degree-of-freedom SRS Part I NESC Academy Multi-degree-of-freedom SRS Part II Three-dof System Example: three_dof_srs_revC.pptx * * * Acceleration Time History: Time (sec) & Accel (G) srs2000G_accel.txt * * * References:… Read more
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