Here is a Newsletter with an article about the Hoover Dam turbine generators: Vibrationdata Newsletter July 2007. Here is a measured sound file from the generator room: Hoover.mp3 Here is a Matlab GUI script for calculating the vibration frequencies of a turbine generator: turbine_generator_frequencies.zip Here… Read more
Here are the materials for sine sweep vibration: PowerPoint File: webinar_sine_sweep.ppt Audio/Visual File: NESC Academy Sine Sweep – Recommend viewing in Firefox with Sliverlight plugin * * * Here is the solid rocket motor accelerometer data, (time (sec) & Accel(G) ): solid_motor.dat Paper: Sine Sweep Frequency Parameters… Read more
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
The Babylonian Talmud (dated to 300 CE) lists seven laws which God gave to the Children of Noah (B’nei Noach): 1 Acknowledge that there is only one G-d who is Infinite and Supreme above all things. Do not replace that Supreme Being with finite idols,… 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
The Book of Ruth begins with the story of Elimelech who married Naomi. They and their two sons, Mahlon and Chilion, moved from Bethlehem to Moab, because their was a famine in their homeland. The sons married Moabite women. One son married Orpah, and the… 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