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The article deals with the problems of controllability, observability and stabilizability of an elastic-structural system treated by the finite element method. The results obtained here agree with that obtained in distributed parameter-system model, nevertheless, they are more convenient than those in carrying out the computation with a computer, at the same time the method appears much easier that the conventional one. In section one, the system's controllability and observability are studied and some conditions which are easier to be justified by computer are given. In section two, the problem of stabilizing an elastic object by the use of linear feedback is fully discussed. As the attained results there show that, so far as an elastic-structural system is concerned, it is possible to assign arbitrary frequencies of vibration only by the use of displacement feedback, however, it is impossible to stabilize the system while the system is completely controllable. While the velocity feedback can stabilize the system, but its ability is limited. The case of rigid body motion involved in the system equation has also been discussed. In section three, the control of a straight beam is treated by the finite element method. The whole system of a beam can be decomposed into four irrelevant subsystems of tension-compression, torsion, bending in two directions, their controllability and observability are also analyzed respectively. The controllability and observability of segment-shaped beam are discussed in the end. 相似文献
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阻尼系数时域识别的灵敏度分析 总被引:3,自引:0,他引:3
本文分析了为何在应用时域方法识别结构参数时,阻尼系数往往是难以识别精确的,提出了一些提高阻尼系数识别精度的措施。 相似文献
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关于一类非线性阻尼模型控制问题的一个注记 总被引:2,自引:0,他引:2
利用模态方法进行柔性体控制,就必须作模态截断。在线性粘性阻尼模型情形,阻尼正比于频率,高阶模态会很快衰减。但对于非线性阻尼模型,情况就复杂了。结果表明,高阶模态响应不总能很快衰减,并依赖于初始条件、因为对于非线性阻尼模型的控制,如何进行模态截断,是一个需要谨慎处理的问题。 相似文献
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