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With the theory of radiation modes,piezoceramics are used as control actuators in the active control of sound radiation.According to the characteristics of the first four radiation mode shapes,the arrangement of four group of actuators is presented.Theoretical analysis and numerical calculation demonstrate that the four group of actuators can not only reduce the sound power effectively,but also decouple the control equations.While controlling of the sound powers of the first four radiation modes,these actuators can convert the complicated control system with multiple input/output into several simple and independent systems with single input/output.
With the theory of radiation modes, piezoceramics are used as control actuators in the active control of sound radiation. According to the characteristics of the first four radiation mode shapes, the arrangement of four group of actuators is presented.Theoretical analysis and numerical calculation demonstrates that that the four group of actuators can not only reduce the sound power effectively, but also decouple the control equations. Whilst controlling the sound powers of the first four radiation modes, these actuators can convert the complicated control system with multiple inputs / output into several simple and independent systems with single input / output.