CAJ | 학술논문

自由衰减信号在工程应用中十分常见，从冲击响应信号中识别真实准确的谐波参数就成为实验研究的关键，相关的参数识别研究不断深入，介绍一种识别阻尼的方法，包括3方面内容：①考虑自由衰减信号的谐噪比和阻尼因素，讨论了两个因素对参数识别的影响。②针对不同频率谐波的参数识别，先进行必要的信号前处理：截取有效信号长度后再截取周期整数倍部分，对称增加一倍信号。③用细化频谱识别谐波频率和初相位，反卷积方法识别谐波振幅的真实衰减过程。仿真模拟和实验信号分析证明理论方法的可行性和优越性，即无需假设阻尼模型，识别得到的谐波振幅随时间变化的时域序列。为实验揭示系统阻尼特性提供一种实用有效的技术方法。
자유쇠감신호재공정응용중십분상견，종충격향응신호중식별진실준학적해파삼수취성위실험연구적관건，상관적삼수식별연구불단심입，개소일충식별조니적방법，포괄3방면내용：①고필자유쇠감신호적해조비화조니인소，토론료량개인소대삼수식별적영향。②침대불동빈솔해파적삼수식별，선진행필요적신호전처리：절취유효신호장도후재절취주기정수배부분，대칭증가일배신호。③용세화빈보식별해파빈솔화초상위，반권적방법식별해파진폭적진실쇠감과정。방진모의화실험신호분석증명이론방법적가행성화우월성，즉무수가설조니모형，식별득도적해파진폭수시간변화적시역서렬。위실험게시계통조니특성제공일충실용유효적기술방법。
The free-decay response (FDR)of dynamical system has been widely used for the identification of structural parameters in many fields of engineerings,and comprehensive studies results have been available in related literatures.A new approach was proposed for identifying the damping ratio by using FDR.The approach includes three main contents:①analyzing the accuracy of the identified parameters in consideration of the influences of damping ratio and harmonic-to-noise ratio (HNR);②for different frequency harmonics,performing the necessary preprocessing of the digital signal,i.e.intercepting a whole number of multiples of harmonic period from an effective signal,and symmetrically doubling the signal;③using discrete deconvolution technique in the identification of damping ratio.The results show that the proposed approach is capable of identifying the structural parameters with acceptable accuracy,and provides an efficient way for revealing the structural damping characteristics and estimating the structural parameters.The approach does not need to depend on a prior knowledge of damping model,and the time sequence reflecting the change of harmonic amplitude can be achieved.