Active Damping of Thermally Induced Vibrations

The prospect of using active damping in a smart structure to suppress thermally induced vibration is investigated. Here smart structure refers to an aluminum structure with an integrated active control system consisting of piezoceramic sensors and actuators. A simply supported aluminum beam is used to illustrate the nature of thermally induced vibrations caused by a suddenly applied heat flux. A distributed piezoelectric self-sensing sensor/actuator pair is implemented to actively suppress the motion caused by thermal disturbances. The effect of large temperature changes on the structure and actuator are taken into account in the control system design. A proportional-derivative controller, a linear quadratic regulator and a positive position feedback filter are considered. Simulation results show that thermally induced vibrations can be damped using currently available smart structure technology, provided temperature effects are properly accounted for in the control law.

[1]  Earl A. Thornton,et al.  Thermal Structures for Aerospace Applications , 1996 .

[2]  Gerald S. Nurre,et al.  A chronology of the on-orbit pointing control system changes on the Hubble Space Telescope and associated pointing improvements , 1992 .

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

[4]  William Prager,et al.  Theory of Thermal Stresses , 1960 .

[5]  Earl A. Thornton,et al.  An experimental investigation of thermally induced vibrations of spacecraft structures , 1994 .

[6]  E. Crawley,et al.  Detailed Models of Piezoceramic Actuation of Beams , 1989 .

[7]  George A. Lesieutre,et al.  Low Temperature Thermal Conductivity, Heat Capacity, and Heat Generation of PZT , 1995 .

[8]  J. L. Fanson,et al.  Positive position feedback control for large space structures , 1990 .

[9]  Ho-Jun Lee,et al.  Active compensation of thermally induced bending and twisting in piezoceramic composite plates , 1996 .

[10]  Singiresu S. Rao,et al.  Piezoelectricity and Its Use in Disturbance Sensing and Control of Flexible Structures: A Survey , 1994 .

[11]  Earl A. Thornton,et al.  Thermally induced bending vibrations of a flexible rolled-up solar array , 1993 .

[12]  H. Tzou,et al.  Active control of mechanical and thermal shock induced vibrations , 1996 .

[13]  L. Meirovitch,et al.  Robustness of the independent modal-space control method , 1983 .

[14]  J. C. Bruch,et al.  Structural control of thermoelastic beams for vibration suppression , 1993 .

[15]  E. Thornton.  Thermal structures - Four decades of progress , 1990 .

[16]  G. C. Andersen,et al.  An overview of the Hubble Space Telescope Pointing Control System design and operation , 1992 .

[17]  K. Chandrashekhara,et al.  Thermally induced vibration suppression of laminated plates with piezoelectric sensors and actuators , 1995 .