Measurement of wave propagation power flow in structures

Details Measurement of wave propagation power flow in structures Measurement of wave propagation power flow in structures

G - Physics

01

H

340/148, 349/29,

G01H 1/00 (2006.01)

Patent

CA 1257920

ABSTRACT A vibration sensor for measuring the flow of vibrational energy through a structure comprises four accelerometers 24-27 placed in cruciform arrangement on the surface of a structure. The signals from the accelerometers are processed in pairs using sum/difference amplifiers 36-40 to give two rotational (41, 42) and one translational (43) acceleration signal. The acceleration signals are frequency modulated (46-48) by a local oscillator 53 of preselected frequency, low-pass filtered (62-64) and the rotational acceleration signals (68, 70) then multiplied (72, 73) in phase quadrature (54) with the translational acceleration signal 69. The DC components of the resulting signals 76 are proportional to the time-averaged vibrational power flow. Knowledge of the flow paths facilitates the design of the structure to minimise effects of unwanted vibrations.

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