admin Scilab is an open source, cross-platform numerical computational package and a high-level, numerically oriented programming language. It can be used for signal processing, statistical analysis, image enhancement, fluid dynamics simulations, numerical optimization, and modeling and simulation of explicit and implicit dynamical systems. Scilab is an… Read more
Maxima is a system for the manipulation of symbolic and numerical expressions, including differentiation, integration, Taylor series, Laplace transforms, ordinary differential equations, systems of linear equations, polynomials, and sets, lists, vectors, matrices, and tensors. Maxima is a descendant of Macsyma, the legendary computer algebra system… Read more
Sage Notebook is a free web-based, open-source, mathematical worksheet development environment. It is an alternative to Magma, Maple, Mathematica, and MATLAB. It can perform symbolic algebraic and calculus operations. * * * Here is an example of an algebraic computation in Sage…. Partial fraction decomposition… Read more
Code::Blocks is a free C/C++ Integrated Development Environment (IDE). It may be downloaded from: http://www.codeblocks.org/ A number of compilers may be used with Code::Blocks. MinGW is a good choice for the compiler. The Code::Blocks website has a bundled installion file that includes MinGW. Note that… Read more
On the fateful morning of 9/11, I watched the TV news coverage of the World Trade Center attack. My mind could scarcely comprehend the unfolding tragedy as I watched each tower collapse. I later wrote an article The World Trade Center Disaster: A Shock Vibration… Read more
The B-52 had about three-fourths of its vertical stabilizer bitten off by 95-mph gusts at 14,300 feet over southern Colorado in 1964. The crew later made a safe landing. * * * I have posted the September 2011 Newsletter at: http://www.vibrationdata.com/Newsletters/September2011_NL.pdf The topics include: Wake… Read more
Here is an excerpt from a National Transportation Safety Board Aircraft Accident Report… Research has shown that fundamental frequency (pitch) can convey information about a speaker’s psychological stress. With regard to fundamental frequency, the Safety Board used the following guidelines from two previous accident investigations… Read more
I have written some tutorials on avionics component isolation which may be downloaded at: avionics_iso.pdf six_dof_isolated.pdf * * * The Matlab GUI scripts are given in the GUI package at: Vibrationdata Matlab GUI Package The function is accessed via: Miscellaneous > Structural Dynamics > Spring-Mass… Read more
The plate is aluminum, 0.063 inch thick. The fixed edge length is 6 inch. The free edge length is 4 inch. The vibration mode was calculated via the Rayleigh method using an assumed displacement function, as carried out via Matlab script: fixed_free_fixed_free_plate.m The method is… Read more
I have posted a Vibrationdata Newsletter with an aviation theme at: http://www.vibrationdata.com/Newsletters/August2011_NL.pdf The articles include discussions of . . . 1. The XF-84H turboprop aircraft which had supersonic blade tip velocity 2. Aircraft landing shock 3. Turbofan engine buzz-saw noise Military Aircraft Carrier & Normal… Read more