Measurement of Power Flow in Uniform Beams and Plates,
- D. U. Noiseux
- J. Acoust. Sot. Am.,
Flexural vibration energy fkom machinery can be transmittal through a structure, such as a panel, to a connected beam-like structure. The connected structure can dissipate this energy through coupling to an acoustic medium or to other structures. The objective of this work is to prevent the energy from flowing to the connection point. An elastic plate is connected to another structure with a resistive comection point impedance. The elastic plate is excited to vibration by a point load at a single fquency. The point force is located at a certain position and acts as the primary mechanical source of vibration for an internally damped, simply supported plate. A point damper, representing a resistively connected structure, located at another position, acts as an energy sink which models the power flow transmission to a connected beam-like structure. The damping coefficient of the point damper represents the degree of energy transmission at the connection point. A control force is applied to the plate in order to reduce the structural intensity (S1) at the point damper location. The analysis and measurement of S1has been studied by few authors. The measurement of S1 has been reported in Refil-6]. Analytical studies of active control of power flow in beams and plates, and shells were reported in Ref.[ 7-16], and experimental studies in Ref.[17-20].