The following Matlab scripts calculate the Fourier transform of a time history: fourier.zip The main script is: fourier.m The remaining scripts are supporting functions. * * * A Matlab GUI version is included in: Vibrationdata Matlab Signal Analysis Package * * * See also: Shock… Read more
The Matlab scripts vc_velox.zip calculate the one-third octave band velocity spectrum of a time history for comparison with ISO Generic Vibration Criteria for Vibration-Sensitive Equipment. The main script is: vc_velox.m The remaining scripts are supporting functions. The input file may either be an acceleration or… Read more
ISO 2631 Mechanical vibration and shock — Evaluation of human exposure to whole-body vibration * * * * Update: The ISO 2631 scripts have been added to the Matlab GUI package posted at: Vibrationdata Matlab Stand-alone Executable GUI Package * * * * The Matlab… Read more
The Matlab scripts in SPL.zip calculate the one-third sound pressure level for an acoustic pressure time history. SPL.m is the main script. The remaining scripts are supporting functions. The scripts have options for A, B & C-weighting. See also: Matlab Acoustic Page * * *… Read more
The Matlab scripts in waterfall_FFT.zip calculate the Waterfall FFT of a time history. The main script is: waterfall_FFT.m The remaining scripts are supporting functions. The scripts also have options for spectrogram and contour plots. Here is another script useful for tracking sine sweeps: sine_sweep_spectral.m *… Read more
The Matlab scripts in PSD.zip calculate the power spectral density function for a time history. The main script is: PSD.m The remaining scripts are supporting functions. * * * A Fortran power spectral density program is given at: PSD.F * * * See also: Matlab Random Vibration… Read more
The overall RMS level of a power spectral density function is equal to the square root of the area under the curve. Power spectral density specifications are typically given in log-log format. Thus special integration rules apply. The Matlab scripts in psd_integ.zip calculate the overall… Read more
The software in the zip file was updated on December 21, 2012. A time history consisting of a series of damped sinusoids can be synthesized to satsify a shock response spectrum (SRS). A Matlab script for this is given in: damped_sine_syn.zip. The main script is: … Read more
The following Matlab files are given at: psd_syn_revD.zip psd_syn.m is the main Matlab script. The remaining scripts in the zip file are supporting functions. It synthesizes an acceleration time history to satisfy a power spectral density function. It also calculates the corresponding velocity and displacement… Read more
Here are some edited notes given to me by a colleague who is writing software programs to import Nastran data into Matlab. DMAP DMAP (Direct Matrix Abstraction Programming) is the language running under the hood in the various nastran solution sequences. All the math that happens… Read more