Vibration and sound radiation controls of beams using layered modal sensors and actuators

A new smart structural configuration for beams with symmetrically embedded modal sensors and actuators is proposed. Pairs of symmetrically installed modal sensors and actuators having the same shape of electrode profile are individually connected by a control unit. They are used to control each corresponding vibration mode of the beam independently. Dynamic response of the structure is investigated by the modal analysis method. Numerical simulations for vibration and sound radiation controls presented for illustrations are limited to simply supported beams. Results indicate that modal sensors and actuators, properly selected on the basis of the location and frequency of external forces, can effectively suppress the beam vibration and reduce radiated sound pressure in the far-field.

[1]  Scott D. Snyder,et al.  Active Control of Acoustic Power Radiated from a Vibrating Planar Structure Using Smart Sensors : Acoustic Power Suppression Using Adaptive Feedforward Control , 1996 .

[2]  Robert L. Clark,et al.  A model reference approach for implementing active structural acoustic control. , 1991 .

[3]  Chris R. Fuller.  Experiments on reduction of aircraft interior noise using active control of fuselage vibration , 1985 .

[4]  C. Fuller,et al.  Experiments on active control of structurally radiated sound using multiple piezoceramic actuators , 1990 .

[5]  Ephrahim Garcia,et al.  A Self-Sensing Piezoelectric Actuator for Collocated Control , 1992 .

[6]  C. Fuller,et al.  Active Structural Acoustic Control with Adaptive Structures Including Wavenumber Considerations , 1992 .

[7]  Francis C. Moon,et al.  Modal Sensors/Actuators , 1990 .

[8]  J. E. Ffowcs Williams,et al.  Review Lecture - Anti-sound , 1984 .

[9]  Alain Berry,et al.  Active control of finite beam volume velocity using shaped PVDF sensors , 1993 .

[10]  Thomas E. Alberts,et al.  Observations on the Nature of Transfer Functions for Control of Piezoelectric Laminates , 1991 .

[11]  Ricardo A. Burdisso,et al.  Design Approaches for Shaping Polyvinylidene Fluoride Sensors in Active Structural Acoustic Control (ASAC) , 1993 .

[12]  C. Wallace.  Radiation Resistance of a Baffled Beam , 1972 .

[13]  Robert L. Clark,et al.  Control of Sound Radiation with Adaptive Structures , 1991 .

[14]  L. Meirovitch,et al.  Active Control of Sound Radiation Pressure , 1990 .

[15]  Leonard Meirovitch,et al.  Dynamics And Control Of Structures , 1990 .