Tom Irvine ModalMass_revK.pdf Effective modal mass and modal participation factors provide a quantitative basis for identifying dynamically significant vibration modes and for guiding modal truncation in structural dynamic analyses. This paper presents a unified formulation for both base-excited systems and grounded systems subjected to externally applied forces.… Read more
Image reference: https://onlinelibrary.wiley.com/doi/full/10.1002/adem.202300394 What Is Anodizing? Anodizing is widely used to improve corrosion resistance and surface durability in aluminum and other light metals. However, under cyclic loading, anodized coatings can play a surprising, and sometimes detrimental, role in fatigue performance. Thanks for reading Tom’s Substack!… Read more
Figure 1. Space Shuttle Orbiter Ku-band Antenna Introduction Mechanical vibration is usually undesirable in a structure because it can lead to fatigue and other types of failures. Vibration does have its beneficial uses, however. For example, dither vibration was used to ensure that the Space… Read more
🐘 The Secret Language of Giants: How Elephants Communicate Through Infrasound When we think of animal communication, we might picture birdsong or whale calls. But elephants, some of the most intelligent and socially complex mammals on Earth, have evolved a secret communication channel that humans… Read more
From the Orthodox Union. The Jewish people are no strangers to uncertainty. Avraham Avinu looked out to the dark desert sky wondering how G-d could possibly fulfill His promise to provide Avraham with progeny and a nation, but G-d pleaded with Avraham to stop looking around at the darkness and hopelessness… Read more
20 And when he (Jesus) was demanded of the Pharisees, when the kingdom of God should come, he answered them and said, The kingdom of God cometh not with observation: 21 Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of… Read more
Matthew 25 31 When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory: 32 And before him shall be gathered all nations: and he shall separate them one from another,… Read more
My heart is very heavy with both joy and sadness. I have sought the Lord through prayer and meditation over the last several months. I continue to do. I received the following messages. First, some very wonderful news. Jesus loves all of us and has… Read more
Doctrine and Covenants 93:30 All truth is independent in that sphere in which God has placed it, to act for itself, as all intelligence also; otherwise there is no existence. ______ Elder Dale G. Renlund As we develop faith in Jesus Christ, we should also… Read more
The story is told that when Robert Louis Stevenson was a child, his nanny came into his nursery to put him to bed. She found the little boy looking intently out of his bedroom window. When she called to him, he continued staring into the… Read more