I am currently researching IEEE Std 693… One of its recommended shaker test methods for power equipment is to use a “sine beat” acceleration time history. The main frequency is selected as the equipment’s natural frequency. The minimum number of beats is 5 with a… Read more
Slides & Video: webinar_47_SRS_synthesis_special_topics.pptx A high-range Cummins Generator in a Seismic Shaker Test.mp4 Topics: 1. Shaker Table Seismic Testing of Equipment using Historical Strong Motion Data Scaled to Satisfy a Shock Response Spectrum 2. Temporal Moments * * * Matlab script: Vibrationdata Signal Analysis Package… Read more
Clintonville, Wisconsin is an inland community, adjacent to Lake Pigeon. USA Today reported on March 21, 2012 that a series of mysterious booms have been fraying residents’ nerves. City administrator Lisa Kuss said the booms have roused people from their beds and into the streets… Read more
The Iwate-Miyagi Nairiku earthquake struck northeast Honshu, Japan, on 14 June 2008. This earthquake had a moment magnitude Mw 6.9 according to the USGS. The peak ground acceleration (PGA) had a maximum vector sum (3 component) value of 4278 cm/sec^2 (4.36 G). This is the highest ever recorded… Read more
Response Spectrum Response spectrum is a plot of the maximum responses (acceleration, velocity, or displacement) of idealized single-degree-of-freedom oscillators as a function of the natural frequencies of the oscillators for a given damping value. The response spectrum is calculated for a specified vibratory motion input… Read more