CAJ | 학술논문

通过对多点激励功率谱再现振动试验控制算法研究。设计基于偏相干分析理论的振动试验系统频响矩阵辨识策略，针对系统频响矩阵存在奇异点及系统频响矩阵为长方矩阵情形，设计基于求解频响矩阵广义逆和矩阵最小范数最小二乘解的 Moore-Penrose 逆系统解耦算法。针对传统差分修正驱动谱控制算法中存在系统功率谱自谱为负数或零值问题，通过引进比例均方根反馈修正算法，设计改进的功率谱均衡控制策略，有效避免功率谱均衡过程中自谱产生负值或零值问题。多点激励功率谱再现振动试验表明，改进的功率谱均衡控制策略对多点激励系统具有可靠、高精度的控制效果。
통과대다점격려공솔보재현진동시험공제산법연구。설계기우편상간분석이론적진동시험계통빈향구진변식책략，침대계통빈향구진존재기이점급계통빈향구진위장방구진정형，설계기우구해빈향구진엄의역화구진최소범수최소이승해적 Moore-Penrose 역계통해우산법。침대전통차분수정구동보공제산법중존재계통공솔보자보위부수혹령치문제，통과인진비례균방근반궤수정산법，설계개진적공솔보균형공제책략，유효피면공솔보균형과정중자보산생부치혹령치문제。다점격려공솔보재현진동시험표명，개진적공솔보균형공제책략대다점격려계통구유가고、고정도적공제효과。
Through studying the control algorithm for multi-exciter PSD (power spectral density)replication vibration tests,an identification strategy for the frequency response matrix of a vibration test system based on partial coherence analysis was designed.For situations of singular points existing in a system frequency response matrix and the matrix being rectangular,different system decoupling algorithms were desgined based on the solutions to the matrix generalized inverse and its Moore-Penrose inverse with the minimum norm and least square methods.Aiming at the situation that the system APSD (auto-power spectral density)might be negative or zero in the traditional difference correction of the drive spectral control algorithm,an improved PSD equalization control strategy was designed by introducing a proportional RMS feedback correction algorithm.The algorithm could effectively avoid the APSD being negative and zero in the process of PSD equalization.The multi-exciter PSD replication vibration tests showed that the improved PSD equalization control strategy can achieve a reliable,high-precision control effect on a multi-exciter vibration system.