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洪峰 《地震工程与工程振动(英文版)》2002,1(2):303-309
In this paper, existing damping theories are briefly reviewed. On the basis of the existing damping theories, a new kind of
damping theory, i.e., the time-delay damping theory, is developed. In the time-delay damping theory, the damping force is
considered to be directly proportional to the increment of displacement. The response analysis of an SDOF time-delay damping
system is carried out, and the methods for obtaining the solution for a time-delay damping system in the time domain as well
as the frequency domain are given. The comparison between results from different damping theories shows that the time-delay
damping theory is both reasonable and convenient.
Supported by: Key Project in Ninth Five-Year Plan of China Seismoligcal Bureau 相似文献
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针对网络控制系统中存在的不确定时滞,将网络控制系统模型转化为不确定系数的离散时间模型。利用Lya-punov稳定性理论和线性矩阵不等式技术,提出动态输出鲁棒控制器的设计方法,同时给出闭环系统鲁棒渐近稳定的充分条件。仿真例子验证了所提方法的有效性。 相似文献
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为进一步提高用户定时校频精度,我们通过使用移相技术并利用高精度数字存储示波器和高精度计数器,对长波接收系统时间延迟的测试方法进行了改进,获得了比原先更精确的测量结果。 相似文献
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研究线性时滞系统的时滞相关稳定性问题。利用李雅普诺夫稳定性理论结合微分不等式 ,提出了若干个时滞相关稳定性的新判据 ,并给出了系统的时滞项上界的估计公式。得到的稳定性判据较简洁 ,且具有较低的保守性。 相似文献
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In this paper, three H∞-control design methods are developed and applied to a three-storey building with an active mass damper as a control mechanism. The system of equations of the structural system, including the actuator and sensors, has been developed directly from experimentally derived data which forms the basis of the benchmark study discussed in this paper. The building plus the damper are modelled as a nominally linear system with input as well as state delays. Feedback control synthesis are first performed by using either of the two forms; the first is a pure state feedback and the other is a static output feedback. The analytical results are cast into a Linear Matrix Inequality (LMI) framework which can be solved numerically by efficient interior-point methods. The developed system is subjected to two historical earthquake excitation inputs (ElCentro and Hachinohe) and to the Kanai–Tajimi filter. The response is given in the form of indices in order to compare with other solutions of the benchmark problem. In addition, simulation results pertinent to the developed techniques are presented. © 1998 John Wiley & Sons, Ltd. 相似文献
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顾及降雨及库水位因素的滑坡时滞分析与预测——以三峡库区新铺滑坡为例 总被引:1,自引:0,他引:1
降雨及库水位涨落是引起库岸滑坡形变失稳的主要诱发因素,但滑坡位移速率对此类诱发因素的响应具有一定的滞后性,影响人类对滑坡所处运动状态的判断与预测.针对常规预测模型中未考虑时滞效应的问题,利用三峡库区新铺滑坡的GNSS位移监测数据、奉节气象站降雨数据以及三峡库区库水位涨落数据,通过对监测区内9个GNSS监测点的位移速率序... 相似文献
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