Please send me an Email if you are going to use this package. Also, you are welcome to participate in the Shock & Vibration courses. Thank you,Tom IrvineEmail: tom@irvinemail.org * * * License information: The software packages on the following links are freely placed in… Read more
View larger image Figure 1. A circular laminated elastomeric bearing on a pier cap, instrumented with displacement transducers straddling the bearing and additional sensors on the pier face. The rubber cover bulges between the internal steel shim planes. Whether a lead core is buried inside… Read more
The Constraint Factor You Inherited — Vibrationdata Vibrationdata Fracture & Fatigue Crack closure modeling The Constraint Factor You Inherited Newman’s crack opening equation contains a single user input, α, that most analysts take from a material file default without ever deciding on it. At the… Read more
A slender store hanging under a fighter wing sits in an acoustic field near 164 dB overall. A wind chime tube hanging from a porch beam sits in an acoustic field near 40 dB. The store is asked to survive; the chime is asked to… Read more
A reader sent in a question that every test engineer runs into sooner or later: For mission synthesis we get three-axis data from the real machine. What is the best way to simulate the same thing on a single-axis shaker table to create the same… Read more
This post is a reply to a recent LinkedIn questionon whether a low-energy impact really costs a bonded joint any fatigue life. It is a good question, and the answer has a number attached to it. The question was posed about aluminum-to-composite adhesively bonded joints:… Read more
The pair below sits on South Bayshore Drive in Coconut Grove, Miami, on the site of the old Grand Bay Hotel. Bjarke Ingels Group designed them, DeSimone Consulting Engineers made them stand up, and they were completed in 2016. Each tower rotates a total of… Read more
SOL 111 or SOL 112? Why a Synthesized Time History Earns Its Keep A base input power spectral density arrives on a specification sheet, and the reflex is automatic. Build the model, run SOL 111, read the RMS stress, apply a three-sigma factor, and compare… Read more
Every introductory vibration course begins by drawing a mass on a spring and declaring that the spring has stiffness but no mass. That assumption is the reason the single-degree-of-freedom system has exactly one natural frequency instead of infinitely many. It is an excellent assumption almost… Read more
The Wall Street Journal ran a piece this week on a circular house in Novato, California, listed for sale for the first time since it was built. Sam Harkleroad put it up in 1963: 1,560 square feet of floor area, roughly 50 feet in diameter,… Read more