admin V1 is the critical takeoff speed for an aircraft at which the pilot must make a decision. The aircraft can still safely stop if the takeoff is aborted prior to V1. The abort could be due to an engine failure, bird strike, blown tire, etc.… Read more
I have begun work on a Matlab GUI finite element package for structural dynamics. This is a long-term work-in-progress! Here is the current package: vibrationdata_fea_preprocessor.zip vibrationdata_fea_preprocessor.m is the main script. The remaining scripts are supporting functions. * * * Here are sample input files in… Read more
PowerPoint File: Webinar_8_Waterfall_FFT.ppt Audio/Visual File: NESC Academy Waterfall FFT – Recommend viewing in Firefox with Sliverlight plugin * * * Data Each of the following has two columns: time(sec) & accel(G) terrier_black_brant_2KHz_lpf_x.zip solid_motor_flight.txt Fwd_Dome_ignition.txt Orion_PA1_LS51v.txt * * * Terrier Black Brant Video * * * Matlab script:… Read more
Malaysia Airlines Flight 370 The leading news story the last few days has been Malaysia Airlines Flight 370 which mysteriously disappeared on March 8, 2014, somewhere over the South China Sea or perhaps the Strait of Malacca. The aircraft was a Boeing 777-200ER. The cause… Read more
Here are the materials. PowerPoint Files: webinar_6_Leakage_Hanning.ppt webinar_7_FFT.ppt * * * Audio/Visual Files – Recommend viewing in Firefox with Sliverlight plugin NESC Academy FFT NESC Academy Leakage Hanning Window * * * Reference: Hanning Window Compenstation Factor * * * Matlab script: Vibrationdata Signal Analysis Package * *… Read more
Here are the materials for Fourier transforms: PowerPoint File: webinar_Fourier_transform.ppt Audio/Visual File: NESC Academy Fourier transforms – Recommend viewing in Firefox with Sliverlight plugin Matlab script: Vibrationdata Signal Analysis Package * * * Python PowerPoint File: webinar_Fourier_transform_python.ppt * * * Data Tuning Fork – time(sec) & unscaled… Read more
Formulas for calculating the speed of sound in gases, liquids, and solids is given in: speed.pdf A Matlab function for these calculations is included in the package given at: Vibrationdata Matlab Signal Analysis Package The speed of sound calculator can be accessed within this package… Read more
Here are the materials for random vibration: PowerPoint File: webinar_random_vibration.ppt Audio/Visual File: NESC Academy Random Vibration – Recommend viewing in Firefox with Sliverlight plugin Matlab script: Vibrationdata Signal Analysis Package * * * Python version PowerPoint File: webinar_4_Random_python.ppt * * * See also: NAVMAT-P9492 Random Vibration… Read more
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