CAJ | 학술논문

研究了多输入多输出正弦扫频试验控制中信号发生、频响函数估计和控制算法等关键问题。针对步进式正弦扫频信号发生中因信号不连续而导致振动台或激振器发生冲击或损坏的问题，提出了两个不同频率的正弦信号平滑过渡的窗函数叠加延拓法，在满足扫频时间条件的同时也提高了试验控制精度；以单位正弦扫频信号作为激励，改变不同激励点的相位以产生满秩激励矩阵，运用相关积分法识别响应稳态正弦时域信号的幅值与相位，根据线性振动理论求解结构的频响函数；以多个控制点的幅值为控制对象，推导出扫频控制基本理论公式，通过参考值与反馈信号的比较来修正激励信号以满足试验条件。以一悬臂梁为研究对象，建立了两输入两输出正弦试验控制系统，结果表明该方法在扫频控制中取得良好的效果。
연구료다수입다수출정현소빈시험공제중신호발생、빈향함수고계화공제산법등관건문제。침대보진식정현소빈신호발생중인신호불련속이도치진동태혹격진기발생충격혹손배적문제，제출료량개불동빈솔적정현신호평활과도적창함수첩가연탁법，재만족소빈시간조건적동시야제고료시험공제정도；이단위정현소빈신호작위격려，개변불동격려점적상위이산생만질격려구진，운용상관적분법식별향응은태정현시역신호적폭치여상위，근거선성진동이론구해결구적빈향함수；이다개공제점적폭치위공제대상，추도출소빈공제기본이론공식，통과삼고치여반궤신호적비교래수정격려신호이만족시험조건。이일현비량위연구대상，건립료량수입량수출정현시험공제계통，결과표명해방법재소빈공제중취득량호적효과。
Swept-sine test is often used to simulate the real vibration situations of aircrafts,vehicles,watercrafts, and electronic devices.Here,a control method for the newly developed multi-input multi-output (MIMO)swept-sine test was proposed. A new method named overlapped windows and extension (OWAE ) was proposed to smooth the discontinuous signal segments of two sinusoid waves with different frequencies.The method improved the control precision and met the requirement of swept time.The correlated integration method was used to identify amplitude and phase of a steady state sine signal.The structures' frequency response functions (FRFs ) were calculated with the linear time invariant (LTI)system theory.The swept control's basic theoretical formulas with amplitudes and phases as control objects for a MIMO swept-sine test were derived.The excitation signal was updated by comparing the feedback response signal and the reference signal.An example was given to simulate a two-input two-output swept-sine control system.The results showed the validity of the proposed control method.