【作者】 岳慧裕； 陆洋； 朱天宇； 党崇； 李程磊； 马锦超；

【Author】 YUE Hui-yu;LU Yang;ZHU Tian-Yu;DANG Chong;LI Cheng-lei;MA Jin-chao;National Key Laboratory of Rotorcraft Aeromechanics, Nanjing University of Aeronautics and Astronautics;Shanghai Aerospace Control Technology Institute;

【机构】 南京航空航天大学直升机旋翼动力学国家级重点实验室； 上海航天控制技术研究所；

【摘要】 直升机主减速器中的齿轮在啮合过程中产生的谐波振动是直升机舱内噪声的主要来源之一,通过设计具有隔振性能的齿轮箱撑杆来抑制该振动向机体的传递可以达到舱内降噪的目的。在直升机主减速器撑杆中周期性地嵌入压电叠堆构成混合振动控制周期撑杆。当压电叠堆与其他材料周期排列组成周期结构时,其在特定频带范围内具有"机械滤波"特性,这种振动控制方式属于被动振动控制;通过调节压电叠堆的驱动电压,可以使压电叠堆呈现出变刚度特性,这种振动控制方式属于主动振动控制。混合振动控制周期撑杆的振动控制方式是由周期结构的禁带效应与压电叠堆变刚度特性组合而成。为研究混合振动控制周期撑杆的主动振动控制与被动振动控制之间的机电耦合关系,本文针对压电叠堆中弹性波的传播与周期结构的机械滤波特性,建立了具有传递矩阵形式的混合振动控制周期撑杆机电耦合动力学模型。从频域的角度将混合振动控制周期撑杆两端的力与速度、驱动电压与电流、杆件几何参数与材料参数耦合起来。得到在压电叠堆最大驱动电压、电流的限制下,进行主被动混合振动控制的混合振动控制周期撑杆的最大力衰减率。更多还原

【Abstract】 The harmonic vibration produced by the gears in the helicopter’s main reducer is one of the main sources of noise in the helicopter cabin. The purpose of noise reduction in the helicopter cabin can be achieved by restraining the transmission of the vibration to the helicopter cabin through the design of gearbox struts with vibration isolation performance. A hybrid vibration control periodic strut is formed by periodically embedding piezoelectric stack in the main reducer of helicopter. When the piezoelectric stack and other materials are arranged periodically to form a periodic structure, it has the characteristic of "mechanical filtering" in a specific frequency band,and this kind of vibration control method belongs to passive vibration control. By adjusting the driving voltage of piezoelectric stack, the piezoelectric stack can show the characteristic of variable stiffness, and this kind of vibration control method belongs to active vibration control. Hybrid vibration control in the periodic struts is composed of the band gap effect of periodic structure and the variable stiffness of piezoelectric stack. In order to study the electromechanical coupling relationship between active vibration control and passive vibration control of hybrid vibration control periodic struts, the electromechanical coupling dynamic model of hybrid vibration control periodic struts with the form of transfer matrix is established for the mechanical filtering characteristics of elastic wave propagation and periodic structure in piezoelectric stack. In frequency domain, the force and velocity at both ends of the hybrid vibration control periodic struts, the driving voltage and current, the geometrical parameters of the rod and the material parameters are coupled in this model. In this paper, the maximum attenuation rate of the hybrid vibration control periodic strut can be obtained under the limitation of the maximum driving voltage and current of the piezoelectric stack by using this model.更多还原