为了提高传统迭代混合试验的收敛效率，提出考虑物理加载时滞的力修正迭代混合试验方法。该方法将数值子结构与试验子结构两部分进行全时程数据交互，其中包括时程内计算与加载的内环控制和时程间外环的迭代收敛控制。在时程内环通过力修正策略对运动方程数值积分中的试验子结构反力进行修正，同时结合三阶多项式外插方法对物理加载位移命令进行时滞补偿。在时程外环结合不动点迭代算法，建立外环迭代收敛控制器，以减小相邻两轮次之间的位移响应误差。以三层框架黏滞阻尼器减震结构为例，通过数值模拟对力修正策略进行了验证，进一步分析了加载时滞大小对迭代收敛性的影响。结果表明：力修正策略能有效提高迭代收敛效率，同时试验子结构反力修正精度越高收敛效率越高；物理加载时滞对迭代收敛性影响显著，时滞补偿能有效提高迭代收敛性。
Abstract
In order to improve the convergence efficiency of the traditional iterative hybrid test (IHT) , a force corrected iterative hybrid tests method considering physical loading time delay (PLTD-FCIHT) is proposed. In this method, the two parts of the numerical substructure (NS) and the experimental substructure (ES) are exchanged for the whole time history data, including the inner loop control of calculation and loading in the time history and the iterative convergence control of the outer loop in the time history. In the inner loop of the time history, the force correction strategy is used to correct the ES reaction force in the numerical integration of the equation of motion. At the same time, the third-order polynomial extrapolation method is used to compensate the time delay of the physical loading displacement command. Combined with the fixed-point iteration in the time history outer loop, an outer loop iterative convergence controller is established to reduce the displacement response error between two adjacent rounds. Taking the three-layer frames viscous damper shock absorption structure as an example, the force correction strategy is verified by numerical simulation, and the influence of the loading time delay on the iterative convergence is further analyzed. The results show that the force correction strategy can effectively improve the iterative convergence efficiency, and the higher the ES reaction force correction accuracy is, the higher the convergence efficiency is; the physical loading delay has a significant impact on the iterative convergence, and the delay compensation can effectively improve the iterative convergence.
关键词
实时混合试验 /
时滞补偿 /
迭代混合试验 /
力修正 /
不动点迭代 /
收敛性
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Key words
real-time hybrid test (RHT) /
time delay compensation /
iterative hybrid test (IHT) /
force correction /
fixed-point iteration /
convergence
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