Do neighbors await our love, our kindness, our help? A few years ago I read a Reuters news service account of an Alaska Airlines nonstop flight from Anchorage to Seattle, carrying 150 passengers, which was diverted to a remote town on a mercy mission to… Read more
Here is a signal analysis package GUI written using Tkinter: vibrationdata_gui_python.zip It is compatible with Python versions 2.7 to 3.3, and hopefully future 3.x versions. vibrationdata.py is the main script. The remaining scripts are supporting functions. These scripts demonstrate the use of multiple windows. *… Read more
PowerPoint File: Webinar_11_PSD.ppt The sample PSD specification is taken from: NAVMAT-P9492 Audio/Visual File: NESC Academy PSD – Recommend viewing in Firefox with Sliverlight plugin * * * Python Version: Webinar_11_PSD_python.ppt * * * Reference Papers: Integration of the Power Spectral Density Function Statistical Degrees-of-Freedom Power Spectral Density… Read more
PowerPoint Files: Webinar_9_white_noise_FFT.pptx Webinar_10_Sample_Rate.pptx Audio/Visual Files – Recommend viewing in Firefox with Sliverlight plugin NESC Academy Sample Rate, Nyquist Frequency & Aliasing NESC Academy White Noise FFT YouTube Videos: Sample Rate, Nyquist * * * Matlab script: Vibrationdata Signal Analysis Package * * * Python version: Webinar_9_white_noise_FFT_python.pptx Python… Read more
A rocket vehicle behaves as a free-free beam during flight. The vehicle’s body bending modes can be excited by wind gusts, aerodynamic buffeting, thrust offset, maneuvers, etc. The bending motion can interfere with the vehicle’s control system. The guidance, navigation and control algorithms must be… Read more
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