admin Matlab scripts are available in : Vibrationdata Signal Analysis Package for the following functions:1. Balancing a rotor with single speed, balancing plane and measurement location2. Balancing a rotor with options for multiple speeds, balancing planes, and measurement locations3. Calculating the rotating unbalance force from an eccentric… Read more
Here are the materials for sine vibration: PowerPoint File: webinar_sine.ppt Channel beam accelerometer data: channel.txt time(sec) & accel(G) Papers: POGO Oscillation Smallwood Algorithm Matlab script Vibrationdata Signal Analysis Package * * * Here is the audio/visual file link: NESC Academy Sine Vibration – Recommend viewing in Firefox… Read more
Here is a script for reading ASCII text files into Matlab: read_data.m This script uses uigetfile to open a dialog box for selecting the input file. – Tom Irvine
Here is a Matlab script that converts a time history to a format which can be input to Femap or some other preprocesser for Nastran analysis. time_history_nastran.m with supporting function: datafix.m It can be used for force, pressure, acceleration or other amplitude types. The script… Read more
We held our first Shock & Vibration Webinar on January 17, 2014. This presentation was sponsored by the NASA Engineering and Safety Center, to which I express gratitude. A link to the audio/visual recording will be posted here in the near future. In addition, here… Read more
The Rice characteristic frequency f of a time history is where y is the amplitude It is useful for estimating the dominant frequency for signal which is fairly sinusoidal. Here is a Matlab script: rice_frequency.m See also: Vibrationdata Signal Analysis Package – Tom Irvine
Here is a chart showing the natural frequencies of piano keys: piano.pdf Here is a paper on some basic music theory: music.pdf * * * See also: Fun with Sound Files Wind Chime Acoustics Tuning Fork Sound and Vibration: tuning.pdf * * * – Tom… Read more
Here is a paper which gives a derivation of the mass and stiffness matrices for beam bending: beam_FEM.pdf * * * Here is a Matlab script for the modal analysis of a straight beam. beam.zip * * * Here is Matlab script for the modal… Read more
This post is a work-in-progress… Frequency Response Function based substructuring (FBS) predicts the dynamic behavior of a coupled system on the basis of free interface FRFs of the uncoupled components. Here is a tutorial paper: Frequency Response Function Substructuring Modal damping requires special consideration: Notes on… Read more
This set of scripts calculates the response of an SDOF system to an applied force PSD. A transfer function is derived. Then its square is applied to the force PSD to calculate the response, using point-by-point multiplication and integration. sdof_ran_force.zip Important note: The following scripts… Read more