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时滞补偿是保证实时混合模拟试验效果的重要环节之一,其中逆补偿方法尽管简单易行,但往往存在补偿不足的问题。该文从频域角度对逆补偿的离散传递函数进行分析,证明逆补偿方法所能补偿的时滞与预测时滞和信号的频率有关,信号频率越小,补偿的结果越接近预测时滞。基于频域评价指标,对位移追踪试验进行了数值模拟和实验室测试,进一步证明逆补偿参数α与补偿的时滞存在10%左右的误差。最后,基于已有的实时混合模拟试验数据,建议当作动器时滞在10 ms~30 ms、结构频率在0.5 Hz~3 Hz时逆补偿参数α取1.1倍预测时滞;对于其他情况,应根据离散函数确定参数α的取值。
Time lag compensation is one of the important links to ensure the effect of real-time mixed simulation test. However, the reverse compensation method often has the problem of insufficient compensation, though it is simple and easy to implement. In this paper, the discrete transfer function of inverse compensation is analyzed from the frequency domain. It is proved that the time delay compensated by the inverse compensation method is related to the predicted time delay and the signal frequency. The smaller the signal frequency, the closer the compensation result is to the predicted time delay. Based on the evaluation index of frequency domain, the numerical simulation and laboratory tests of the displacement tracking experiment are carried out. It is further proved that the inverse compensation parameter α and the compensated time delay have about 10% error. Finally, based on the existing real-time mixed simulation test data, it is suggested that the prediction delay should be 1.1 times the inverse compensation parameter α when the actuator delay is between 10 ms and 30 ms and the structure frequency is between 0.5 Hz and 3 Hz. For other cases, According to the discrete function to determine the value of the parameter α.