Consider a lightly damped, single-degree-of-freedom system subjected to broadband random base excitation. The system will tend to behave as a bandpass filter. The bandpass filter center frequency will occur at or near the system’s natural frequency. The system response will thus tend to be narrowband… Read more
I recently came across a vendor that offers an isolator design using the concept in the figure above. The system is also referred to as the standard-linear solid model (SLS) by Zener, and is used as a simplified model for structural damping. It is a… Read more
I had the opportunity to give the keynote speech at the workshop. Here is my presentation, which is rather non-technical. Enjoy… Dynamics Engineering: A Call to Serve – Tom
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
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 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
This is the beginning of my scriptural teaching blog. Scriptures will be taken from the Holy Bible, the Book of Mormon, Doctrine & Covenants, and other sacred texts. The posts will include commentary. The purpose is to give glory to Jesus Christ, who is Yeshua… Read more
Again, I will present a paper on my NESC shock & vibration educational materials at the Aerospace Spacecraft & Launch Vehicle Dynamic Environments Conference, in El Segundo, California, June 7-9, 2011. I hope to meet some of you there. You may download the presentation at:… Read more
Some NASA colleagues and I visited SpaceX in Hawthorne, California, on Thursday. Thanks to SpaceX engineers Sam DiMaggio and Jessica Jensen for the guided tour. We saw a Dragon spacecraft being built, as well as several rocket engines. Sam DiMaggio, who leads the loads and… Read more
Greetings, I will be posting news about my shock & vibration research and latest software and tutorials on this blog. I am currently serving as a industry representative on the NASA Engineering & Safety Center (NESC), Technical Disciplines Team for Loads & Dynamics, under the leadership… Read more