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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

Matlab script: %% k_factor.m ver 1.0 by Tom Irvine%% k factor for one-sided normal tolerance limit%% p = probability percent% c = confidence percent% nsamples = number of samples%% k = tolerance factor% Zp = Z limit corresponding to probability area in the normal% distribution… Read more