适应动态加速度场的压电-液压串联复合激振装置研制  

Development of a piezoelectric-hydraulic series hybrid vibration exciter undergoing dynamic overloads

作　　者：毛勇建[1] 李明海[1] 何颖波[2] 严侠[1] 刘谦[1] 凌明祥[1] 康甜[1] MAO Yongjian;LI Minghai;HE Yingbo;YAN Xia;LIU Qian;LING Mingxiang;KANG Tian(Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,China;China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621999 [2]中国工程物理研究院,四川绵阳621999

出　　处：《光学精密工程》2023年第22期3318-3330,共13页Optics and Precision Engineering

基　　金：国防技术基础重点项目资助(No.JSHS2018212C001)。

摘　　要：为了实现动态加速度与时变振动环境的综合模拟,研制了一套适应动态加速度场的轻量宽频激振装置。首先提出了压电-液压串联复合激振方法和装置构型,解决了传统激振方法“宽频不轻量、轻量不宽频”的难题。设计了六单元并联压电激振模块,建立了精密装调工艺,并联激振效率达到74.2%。为满足动态加速度环境下的宽频激振需求,提出液压内嵌式定中方案,研制了具有“缸中缸”构型的液压激振模块。基于分频器,提出了串联复合激振系统的分频控制方法,实现了压电、液压激振模块的协调工作、均衡出力。以力平衡控制结合零位移反馈补偿控制,提出了液压激振模块定中控制方法,实现了动态加速度环境下的精确定中。提出了变增益、长时波形再现两种时变振动控制方法,研制了一体化的控制系统。测试结果表明,串联复合激振装置在离心加速度不低于60 g、加速度变化率不低于15 g/s工况下,分别实现了50 kg负载下的6 grms振动加速度、10~2 000 Hz频率范围的宽频激振。该装置已应用于多项惯性器件、组件和系统的环境试验考核,载荷控制效果良好。相比飞行试验,本文成果为飞行器制导、控制系统功能性能考核提供了高效经济的实验室手段,特别在大样本数据获取方面具有优势。A light-weight and wide-bandwidth vibration exciter operating in dynamic overload environments was developed to conduct combined simulations of dynamic overload and time-varying vibration.A piezoelectric-hydraulic series hybrid vibration excitation method and corresponding configuration are proposed to solve the problem of narrow bandwidth with light weight or heavy weight with wide bandwidth.A six-element piezoelectric parallel excitation module was designed and the corresponding precise assembly technology was built,achieving a parallel excitation efficiency of 74.2%.A hydraulic embedded centering method is also proposed for the hydraulic actuator to operate in dynamic overload environments.In addition,a hydraulic excitation module with a novel cylinder-in-cylinder configuration was developed.The frequency-division control method for series hybrid excitation systems was designed based on a frequency divider,with the hydraulic and piezoelectric vibration excitation modules working coordinately and loading with equilibrium.Combining force balance control with zero-displacement feedback compensation,a centering control method was designed for the hydraulic excitation module.Thus,precise centering in dynamic overloads was accomplished.Two time-varying vibration control methods,namely variable gain and long-duration waveform replication methods,are proposed,and the integrative control system was developed as well.Performance tests show that the developed hydraulic-piezoelectric series hybrid vibration exciter features excitation abilities of acceleration over 6 grms and frequency band covering 10-2000 Hz for a payload over 50 kg in centrifugal overload exceeding 60 g and overload rate exceeding 15 g/s,respectively.The exciter was installed on a dynamic centrifuge and applied in a number of tests for inertial sensors,assemblies,and systems with good load control effects.In comparison to real flight tests,the dynamic overload-vibration simulation technique presented in this paper provides a more efficient and more eco

关 键 词：压电激振 液压激振 柔性机构 微位移放大 离心机 

分 类 号：TH113.2[机械工程—机械设计及理论] TN384[电子电信—物理电子学]