Structural Acoustics and Active Structural Acoustic Control（结构声学与结构声主动控制）
讲座名称：
Structural Acoustics and Active Structural Acoustic Control（结构声学与结构声主动控制）
讲座时间：
2012-05-15
讲座人：
Jeffrey S. Vipperman
形式：
校区：
兴庆校区
实践学分：
讲座内容：
应航天航空学院、机械结构强度与振动国家重点实验室邀请，美国匹兹堡大学副教授Jeffrey S. Vipperman博士来我院进行学术访问，并作学术讲座：
题目：Structural Acoustics and Active Structural Acoustic Control（结构声学与结构声主动控制）
时间： 5月15日（星期二）上午9：00
地点：教一楼南208，机械结构强度与振动国家重点实验室 会议室
报告摘要：
Sound radiation from vibrating structures can often be found in launch vehicles, aircraft, automobiles, and ships.Severe radiation sound can worsen the environment for living things and instruments on board. Researchers have made extensive effort to reduce sound radiation from structures. This talk will outline fundamental structural acoustic theory and then present some applications. The Kirchoff-Helmholtz integral equation and Rayleigh integral will be presented along with the theory governing sound radiation from infinite and finite structures. Of particular importance for finite structures, is the self-and mutual radiation efficiencies. The wavenumber transform will be presented as a popular tool for determining radiation conditions. The first application will be transmission loss through panels and cylinders.Next, an experimental implementation of a multivariable feedback active structural acoustic control system is demonstrated on a piezostructure plate with pinned boundary conditions.Here, four adaptive piezoelectric sensoriactuators provide an array of truly collocated actuator/sensor pairs to be used as control transducers. Radiation filters are developed based on the self- and mutual-radiation efficiencies of the structure and are included into the performance cost of an H2 control law which minimizes total radiated sound power. In the cost function, control effort is balanced with reductions in radiated sound power. A similarity transform which produces generalized velocity states that are required as inputs to the radiation filters is presented. Up to 15 dB of attenuation in radiated sound power was observed at the resonant frequencies of the piezostructure.
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