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Working with John Taylor & Co., a company of local bell
founders, the ASDEC team scanned the structural dynamics of two
large bells using a robotized 3D laser vibrometry system at
approximately 4,000 measurement locations.
Their unique structural dynamic measurement can be used on its
own or to correlate against finite element analysis (FEA)
computer modeling - a computerized method for predicting how a
product reacts to real-world forces, vibration, heat, fluid
flow, and other physical effects.
According to Martin Cockrill, Technical Specialist at ASDEC,
"traditional techniques at best can only provide a coarse
glimpse into the murky world of structural dynamics. By
utilizing ASDEC's advanced robotized laser system we were able
to reveal the beauty of the bells vibration in amazing detail. A
thorough, accurate measurement of any structure empowers
designers to correlate their virtual models and rapidly move
forward with concepts and designs that are grounded in fact."
When a bell is struck the impact causes various different
vibrations or modes, whose frequency and intensity is
predominantly affected by the individual profile of the bell.
Bells are one of the earliest known musical instruments, using
mechanical resonance to produce a powerful harmonious sound.
Bell founding - the casting of bells in a foundry - has been
present in Europe since at least the fifth century. In Asia
bellfounding dates back to 2000BC.
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