Vibrationdata Blog

This is the spectral analysis of the refrigerator in my allergist’s office that stores the allergen doses, as measured with my Smartphone. Spectral peaks occur at 60, 129, 133.5, 267, 401 & 641 Hz. The 133.5 Hz peak has integer harmonics at 267 & 401… Read more

Cavitation is the formation of vapor bubbles within a liquid at low-pressure regions that occur in places where the liquid has been accelerated to high velocities, as in the operation of centrifugal pumps, water turbines, and marine propellers. The water jet slows down after traveling… Read more

Argosy Cruises’ Salish Explorer Passenger Ship (Image courtesy of Vessel Finder) This ship is used for tours around the Puget Sound waterways in the Seattle area. My family and I had the opportunity to take a ride on this ship recently. The Salish Explorer is… Read more

I had the opportunity to donate blood recently inside this diesel bloodmobile. The vehicle had an onboard generator to provide electrical power for the lights, refrigerator, and other equipment. The generator produced vibration spectra mainly at ~ 60 and 120 Hz which could be both… Read more

The MV Tacoma is a ferry that runs between Seattle and Bainbridge Island. MV stands for “motor vehicle” and is used to designate a ferry. The ferry’s size class is “Jumbo Mark II.” The total engine power is 16,000 hp from 4 x EMD 16-710G… Read more

The West Seattle Bridge was built between 1981 and 1984 after the previous bridge was deemed inoperable as a result of being struck by the freighter Antonio Chavez in 1978. The bridge spans the east and west channels that form the mouth of the Duwamish… Read more

This is a work-in-progress. More to come later… SDOF Response to White Noise Base Input Rainflow Statistical Study: white_noise_sdof_rainflow_study.pptx See also: Rainflow Cycle Counting Tom Irvine

A crack in a steel beam forced the closure of the Interstate 40 Hernando DeSoto bridge that connects Arkansas and Tennessee over the Mississippi River at Memphis.   A critical beam was fractured to the point of being nearly severed. Photos of the crack appear to… Read more

This photo was taken outside of my former office in Huntsville, Alabama. As newly poured concrete hardens and dries, it shrinks. This is due to the evaporation of excess mixing water.  The cracks in the photo may have formed during this phase. In addition, the concrete experiences… Read more

United Airlines Flight 328 was a scheduled domestic passenger flight from Denver to Honolulu, Hawaii on February 20, 2021. The Boeing 777-200 aircraft operating the route suffered engine failure shortly after takeoff The failure was “contained” but resulted in a debris field at least one… Read more