For the past eight years, I have written a required monthly status report to another organization for my NASA contractor work. I have written my accomplishments and planned work in short, concise sentences, usually in numbered list format. I was then notified by this organization… Read more
Honeycomb sandwich structures are designed to have a high stiffness-to-mass ratio. The stiff, strong face sheets carry the bending loads, while the core resists shear loads. The face sheets are typically made from aluminum or carbon fiber with epoxy resin. The honeycomb core material is… Read more
John 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. * * * * Psalm 136:26 O give thanks unto the God of heaven: for his mercy endureth… Read more
There is a widely-taught principle in my church that “Obedience is the first law of heaven.” This may have been an extrapolation from Alexander Pope’s quote that “Order is heaven’s first law.” But discernment must precede obedience. The Lord placed Adam and Eve in the… Read more
Aerospace pyrotechnic shock response spectrum (SRS) specifications are almost always given with an amplification factor Q=10 Corresponding time history waveforms for the base input acceleration are almost never given with the specifications Users are allowed to synthesize their own waveforms to satisfy the SRS for… Read more
Shock and vibration analysis can be performed either in the frequency or time domain The time domain method requires more computation time but is much better suited for transient and nonstationary excitation Time domain methods are also better for rainflow fatigue cycle counting Students should… Read more
We are not human beings having a spiritual experience; we are spiritual beings having a human experience. – Pierre Teilhard de Chardin (1881-1955) Quoted by: President Thomas S. Monson, BYU Devotional Be a Light to the World, November 1, 2011 * * * * *… Read more
“In our friendly neighbor city of St. Augustine, great flocks of sea gulls are starving amid plenty. Fishing is still good, but the gulls don’t know how to fish. For generations they have depended on the shrimp fleet to toss them scraps from the nets.… Read more
These are the generations of the heavens and of the earth when they were created, in the day that the Lord God made the earth and the heavens. Genesis 2:4 * * * In rabbinic conception, Adonai “Lord” represents the attribute of mercy, while Elohim… Read more
The punch file method may be used to extract the mass & stiffness matrices from Nastran models. The format is awkward since zero terms are not stored. Also the matrices are assumed to be symmetric, and the upper triangular portion above the diagonal is not… Read more