Response Spectrum Response spectrum is a plot of the maximum responses (acceleration, velocity, or displacement) of idealized single-degree-of-freedom oscillators as a function of the natural frequencies of the oscillators for a given damping value. The response spectrum is calculated for a specified vibratory motion input… Read more
Launch vehicle avionics components must be designed and tested to withstand random vibration environments. These environments are often derived from flight accelerometer data of previous vehicles. This data tends to be nonstationary as shown in the figure above. The typical method for post-processing is to… Read more
The Bible teaches: Cast thy bread upon the waters: for thou shalt find it after many days. (Ecclesiastes 11:1) This means that we should serve others without expecting any immediate reward. Eventually, we will receive blessings. As Melvin J. Ballard said “A person cannot give… Read more
The children of Israel traveled through the Sinai wilderness. The following story is given in Numbers 21. [4] And they journeyed from mount Hor by the way of the Red sea, to compass the land of Edom: and the soul of the people was much… Read more
Naaman was a captain of the king of Syria’s army. Naaman had leprosy, a terrible disease, according to 2 Kings 5. The maid of Naaman’s wife said unto her mistress, “Would God my lord were with the prophet (Elisha) that is in Samaria! for he… Read more
* * * The Greek philosopher Socrates said: “The unexamined life is not worth living.” There are far too many people in the world who are careless and who do not accept responsibility for their actions. And there are many who say “Eat, drink and… Read more
Please help me send Bibles to poor people throughout the world: Support Link * * * The New Testament contains a short book called Philemon. Here is a summary: The Apostle Paul introduces himself as a prisoner of Jesus Christ. Paul was under house arrest… Read more
The most widely used algorithm for the Shock Response Spectrum (SRS) calculation for base excitation is the ramp invariant digital recursive filtering relationship given in: David O. Smallwood, An Improved Recursive Formula for Calculating Shock Response Spectra, Shock and Vibration Bulletin, No. 51, May 1981.… Read more
It appears GotoBLAS2 has been deprecated (i.e. orphaned). The new standard is OpenBLAS. OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version. OpenBLAS is an open source project supported by Lab of Parallel Software and Computational Science, Institute of Software Chinese Academy… Read more
I have several weaknesses of my own. I often have fatigue. And I have a borderline case of Asperger syndrome. But the purpose of this message is not to dwell on my own condition. Rather it is to present scriptural insights. * * * The… Read more