PowerPoint File: webinar_17_SDOF_force.pptx Audio/Visual File: NESC Academy SDOF – Response to Applied Force – Recommend viewing in Firefox with Sliverlight plugin * * * Reference Papers: T. Irvine, Machine Mounting for Vibration Attenuation, Rev B, Vibrationdata, 2000 link Bruel & Kjaer Booklets: Mobility Measurement link Modal… Read more
PowerPoint File: Webinar_16_VRS.pptx Audio/Visual File: NESC Academy VRS – Recommend viewing in Firefox with Sliverlight plugin * * * Python Version Webinar_16_VRS_python.pptx Python script: Python Signal Analysis Package GUI * * * PSD Data Files: webinar_16_data_files.mat webinar_16_data_files.zip * * * Reference Paper: An Introduction to the… Read more
Here is a paper which gives a derivation of the equations of motion: semidefinite_force.pdf It also covers the transfer functions which can be calculated if the rigid-body mode is omitted. Here is a Matlab script: semidefinite_force.zip The main script is: semidefinite_force.m The remaining scripts are… Read more
TTL = Transistor–transistor logic Here is a Matlab script to convert a TTL tachometer signal from a motor shaft encoder into a cycles per second (CPS) vs. time plot. ttl_cps.m The script’s cycle detection criterion might need adjustment for a given encoder system. Please send… Read more
PowerPoint File: webinar_15_SDOF_frequency_domain.ppt Audio/Visual File: NESC Academy SDOF_response_base_input_frequency_domain – Recommend viewing in Firefox with Sliverlight plugin * * * PSD Data File: navmat_spec.psd * * * Python webinar_15_SDOF_frequency_domain_python.pptx Python script: Python Signal Analysis Package GUI * * * Reference Papers: Equivalent Static Loads for Random Vibration link… Read more
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