admin There is an occasional need to compare the effects of two different power spectral density (PSD) base input functions for a particular component. This would be the case if the component has already been tested to one PSD but now must be subjected to a… Read more
The static deflection method can be used for estimating the fundamental frequency of a grounded dynamic system. A 1 G body load is applied to the system for this analysis. The method can be used as a “ballpark” check for finite element models in conjunction… Read more
PowerPoint File: Webinar_14_PSD_synthesis.pptx Audio/Visual File: NESC Academy PSD_synthesis – Recommend viewing in Firefox with Sliverlight plugin * * * PSD Data File: navmat_spec.psd * * * Matlab script: Vibrationdata Signal Analysis Package * * * Python Version Webinar_14_PSD_synthesis_python.pptx Python script: Python Signal Analysis Package GUI * *… Read more
Testing to Shock Response Spectrum (SRS) specifications is usually performed using complex oscillating waveforms. This is also true for analytical simulation in the time domain. There are several reasons for this. Complex oscillating pulses can typically meet both the positive and negative SRS for a… Read more
PowerPoint File: Webinar_13_PSD_sdof_response.pptx Audio/Visual File: NESC Academy SDOF_Response_to_PSD_Input – Recommend viewing in Firefox with Sliverlight plugin * * * Reference Paper: Derivation of Miles Equation * * * Matlab script: Vibrationdata Signal Analysis Package * * * Python Version: Webinar_13_PSD_sdof_response_python.ppt Python script: Python Signal Analysis… Read more
PowerPoint File: Webinar_12_PSD_data.pptx Audio/Visual File: NESC Academy PSD data – Recommend viewing in Firefox with Sliverlight plugin Data: Taurus_auto.dat – Time(sec) & Accel(G) * * * Matlab script: Vibrationdata Signal Analysis Package * * * Python Version: Webinar_12_PSD_data_python.pptx Python script: Python Signal Analysis Package GUI * * *… Read more
Here is a signal analysis package GUI written using Tkinter: vibrationdata_gui_python.zip It is compatible with Python versions 2.7 to 3.3, and hopefully future 3.x versions. vibrationdata.py is the main script. The remaining scripts are supporting functions. These scripts demonstrate the use of multiple windows. *… Read more
PowerPoint File: Webinar_11_PSD.ppt The sample PSD specification is taken from: NAVMAT-P9492 Audio/Visual File: NESC Academy PSD – Recommend viewing in Firefox with Sliverlight plugin * * * Python Version: Webinar_11_PSD_python.ppt * * * Reference Papers: Integration of the Power Spectral Density Function Statistical Degrees-of-Freedom Power Spectral Density… Read more
PowerPoint Files: Webinar_9_white_noise_FFT.pptx Webinar_10_Sample_Rate.pptx Audio/Visual Files – Recommend viewing in Firefox with Sliverlight plugin NESC Academy Sample Rate, Nyquist Frequency & Aliasing NESC Academy White Noise FFT YouTube Videos: Sample Rate, Nyquist * * * Matlab script: Vibrationdata Signal Analysis Package * * * Python version: Webinar_9_white_noise_FFT_python.pptx Python… Read more
A rocket vehicle behaves as a free-free beam during flight. The vehicle’s body bending modes can be excited by wind gusts, aerodynamic buffeting, thrust offset, maneuvers, etc. The bending motion can interfere with the vehicle’s control system. The guidance, navigation and control algorithms must be… Read more