Deuteronomy 25 [4] Thou shalt not muzzle the ox when he treadeth out the corn. 1 Corinthians 9 [9] For it is written in the law of Moses, thou shalt not muzzle the mouth of the ox that treadeth out the corn. Doth God take… Read more
Isaiah 7 [14] Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel. Matthew 1 [23] Behold, a virgin shall be with child, and shall bring forth a son, and they… Read more
Consider the case where flight or test pyrotechnic source shock data has been measured on a launch vehicle with a 1-meter diameter aluminum cylindrical shell. Assume that the source device is frangible joint with a certain number of grains per length. Now the same device… Read more
Genesis 15 1 After these things the word of the Lord came unto Abram in a vision, saying, Fear not, Abram: I am thy shield, and thy exceeding great reward. 2 And Abram said, Lord God, what wilt thou give me, seeing I go childless, and the steward of… Read more
As a necessary disclaimer, there are times that we need to leave a relationship or situation for our physical or mental safety. Our obligation to forgive a perpetrator does not require us to remain in an abusive relationship. There are other, less extreme, cases where… Read more
This is a work-in-progress. Here are some slide presentation with an emphasis on launch vehicles. Equivalent Static Loads for Random Vibration & Alternate Link Damping & Isolation & Alternate Link Liftoff Vibroacoustics & Alternate Link Ascent Vibroacoustics & Alternate Link Launch Vehicle Pogo, Combustion Instability… Read more
Structural dynamics systems can be represented in terms of mass, damping and stiffness matrices. Each of these matrices may be coupled depending on the model complexity, degrees-of-freedom, etc. The mass and stiffness matrices in the assembled equation of motion may be uncoupled using the normal… Read more
Eli was the High Priest of Shiloh and also a Judge of Israel. He was also the “Prophet.” Eli faithfully served as a father figure to Samuel. He also had the wisdom and inspiration to realize that Samuel should be the next high priest, rather… Read more
Structural system & component damping can measured via modal testing with applied force excitation. One excitation method is an impulse hammer test. Another method is a small shaker attached to structure via a stinger rod. Damping can also be measured by mounting the test unit… Read more
Structural damping depends on materials, joints, boundary conditions, friction, acoustic radiation, etc. Damping may be nonlinear, increasing as the excitation and response levels rise. The damping for a given structure or component must be measured! But here is some empirical background data… Papers Damping Properties of… Read more