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 economical laboratory approach for testing functional properties of guidance and control systems of aircrafts and spacecrafts,especially for large sample test data accumulation.
作者
毛勇建
李明海
何颖波
严侠
刘谦
凌明祥
康甜
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)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
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)。
关键词
压电激振
液压激振
柔性机构
微位移放大
离心机
hydraulic excitation
piezoelectric excitation
compliant mechanism
micro-displacement amplification
centrifuge
