admin IEST-RD-DTE012: Handbook for Dynamic Data Acquisition and Analysis The purpose of this Handbook, IEST-RD-DTE012.2, is to provide guidelines for acquiring and analyzing structural (or mechanical) shock and vibration, and acoustic and aerodynamic noise data from flight and ground tests for all categories of aerospace vehicles.… Read more
Dr. Curtis Larsen asked me to distribute this newly-published “Lessons Learned” document. It is oriented to systems engineering. NASA/CR—2011–216468, Lessons Learned in Engineering J.C. Blair, R.S. Ryan, and L.A. Schutzenhofer Al Signal Research, Inc., Huntsville, Alabama Download Link Topics of interest include: turbopump vibration &… Read more
Some colleagues and I recently debated whether fatigue relationships could be applied to repetitive shock environments. Each of us had a persuasive hypothesis as to whether fatigue was applicable, but none had any data to support his claim. I thus perform my own test at… Read more
With the encouragement of my NASA colleagues, I have started a Python Blog at: Vibrationdata Python Blog Please visit this site and contribute your own experience. Thank you, Tom Irvine
FreeMat is an open-source software environment similar to Matlab. The latest version is 4.0, released 2009-10-09. I tried FreeMat with one of my Matlab scripts which prompts the user for keyboard input. Unfortunately, this resulted in an error: In /usr/local/share/FreeMat-4.0/toolbox/io/input.m(input) at line 37 In /home/jarle/freemat/inndata.m(inndata)… Read more
Here is my current method. Please let me know if you have a better one. The input data may be either space, tab, or comma delimited. ########################################################################## import os import re from numpy import array,zeros,concatenate,linspace,std from sys import stdin import matplotlib.pyplot as plt ######################################################################## def… Read more
I have installed Linux Ubuntu on my 64-bit Windows PC, turning it into a dual boot configuration. The link is: http://www.ubuntu.com/download/ubuntu/windows-installer * * * I have also installed the Linux versions of Python & Spyder. Here is a Python installation method from Nick Smith: Part… Read more
Every Python book and website tutorial recommends the following command for prompting the user for input: raw_input() But I have found that this command is buggy and unreliable. Specifically, I wrote a long, complex code that had several raw_input() commands. The code ran successfully in… Read more
The Python scripting program, ver 2.7.2, can be freely downloaded from: http://www.python.org/download/ Programmers will also need to install libraries such as NumPy, SciPy and matplotlib, particularly for science and engineering programming. These libraries are also freely available, but their proper installation and integration with Python is tricky. As… Read more
I had the opportunity today to speak with several engineers from the Aerospace Corporation. They said that their organization is beginning a gradual transition from Matlab to Python. Python is an interpreted, interactive, object-oriented, open-source programming language. In addition, numerical library functions are available for Python.… Read more