超声速气流中壁板颤振分析及负电容分流控制

Analysis and control of panel flutter in supersonic flow by attaching negative capacitance shunts

为了控制超声速气流中壁板的颤振,在壁板上颤振变形较大的位置粘贴压电片,并连接负电容分流电路。利用负电容分流电路改变壁板弯曲刚度,从而提高壁板的颤振临界速度;有限元计算结果表明,负电容分流电路可以提高壁板的模态频率和颤振临界速度。随着负电容绝对值的增大并接近压电片固有电容,壁板颤振临界速度快速升高;非线性颤振计算结果也验证了负电容对壁板颤振控制的有效性。

In order to control the flutter of panels in supersonic flow,piezoelectric patches were bonded to the panel surfaces where flutter deformations were large.Each piezoelectric patch was connected with a negative capacitance shunt,which was utilized to modify the bending rigidity of the panel so as to boost the flutter critical speed.The results of finite element calculations demonstrate that the modal frequencies and flutter critical speed of the panel were effectively enhanced by attaching negative capacitance shunts.With increasing the magnitude of negative capacitance,especially when it approaches to the inherent capacitance of the piezoelectric patch,the flutter critical speed of the panel increases rapidly.The results of nonlinear flutter calculations also validate the effectiveness of the negative capacitance shunts control.