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. Note that the mass and stiffness properties vary along the vehicle’s length. Furthermore, the mass properties change with… Read more
The First Article of Faith of my church is: We believe in God, the Eternal Father, and in His Son, Jesus Christ, and in the Holy Ghost. The Father and Son have glorified bodies. The Holy Ghost is personage of spirit that can dwell in… Read more
This script demonstrates a Matlab anonymous function with variable coefficients. It also performs integration using the quad function, which uses adaptive Simpson quadrature. This example is from an actual engineering problem for beam vibration. L=27.5; beta=4.73004/L; % sigma1=( sinh(beta*L) +sin(beta*L))/(cosh(beta*L) -cos(beta*L)); % core=@(x) ((cosh(beta*x)-cos(beta*x))-sigma1*(sinh(beta*x) -sin(beta*x))).^2;… Read more
Preliminary notes for acoustic waves: c = speed of sound f = frequency k = wavenumber lambda = wavelength r = radius wavelength is equal to the speed of sound divided by frequency lambda = c / f wavenumber is equal to two pi divided… Read more
Here are some links for libraries of downloadable papers: http://www.science.gov http://ntrs.nasa.gov/?method=aboutntrs http://www3.alcatel-lucent.com/bstj/ – Tom Irvine
Piezoelectric shunt damping systems reduce structural vibration by shunting an attached piezoelectric transducer with an electrical impedance. Current impedance designs result in a coupled electrical resonance at the target modal frequencies. Piezoelectric transducers (PZTs), in conjunction with appropriate circuitry, can be used as a mechanical… Read more
Jesus Christ taught the “greatest commandment” in the following Biblical account. Mark 12 [28] And one of the scribes came, and having heard them reasoning together, and perceiving that he had answered them well, asked him, Which is the first commandment of all? [29] And… Read more
The European Cooperation for Space Standardization http://www.ecss.nl/ Download: ECSS-E-ST-10-03C, Space Engineering: Testing Spacecraft Mechanical Loads Analysis Handbook: ECSS-E-HB-32-26A_19February2013 Slide summary: ESA_mechanical_loads_handbook_part_1 * * * SMC-S-016, Air Force Space Command, Space and Missile Systems Center, Standard Test Requirements for Launch, Upper-Stage and Space Vehicles, 2014 Download… Read more
I have been thinking lately about the power of words. Too often, people use harsh criticism against others. There may be instances where criticism is justified, but these should be very rare. Critics may act out of pride, envy or fear. This is especially noticeable… Read more
Proverb 28:20 A faithful man shall abound with blessings: but he that makes haste to be rich shall not go unpunished. 1 Timothy 6:10 For the love of money is the root of all evil: which while some coveted after, they have erred from the… Read more