Active control of structural acoustic radiation into an enclosure based on radiation modes

With the example of a baffled plate, the formulation for calculating the radiation modes is developed in time domain, whose radiation operator is built by Rayleigh integral formula.

With the example of plane,the acoustic radiation modes whose radiating operator is constructed by Rayleigh integral is investigated by far field method.

With a short duration and a simple implement,the obtained UWB pulse can meet Federal Communications Commission(FCC) spectral mask.

The method using combining Gaussian pulse and its higher-order derivatives waveform is presented on the analysis of the relations of the central frequency of power spectral density and the higher-order derivatives of Gaussian pulse,which satisfies UWB emission mask by FCC proposed.

The method using Gaussian pulse wave combination subsection approach is presented, which aims at emission mask property of UWB system proposed by FCC.

In the Ultra-wideband communication systems, based on the restriction of Federal Communications Commission (FCC) emission mask, the methods of designing impulse pulse waveforms and the modulation scheme which has good performance are the key technique of the Ultra-wideband communications.

Application of piezoelectric actuators in ASAC based on radiation modes;

Measurement of adjoint coefficient of radiation modes for vibrating plate;

A new piezoelectric sensor design for a clamped-clamped plate is presented to measure its amplitudes of the first three radiation modes.