【作者】 王军；

【导师】 董毓新；

【作者基本信息】 大连理工大学 ， 水利水电工程， 2002， 硕士

【摘要】 红石水电站机组振动引起厂房及大坝等建筑物剧烈振动，据已掌握的国内外文献，象这样严重的振动也很少见。厂房在此长期严重的振动下，立柱出现水平周边裂缝，门窗墙壁也均产生裂缝，威胁到电站的安全运行。现场测试表明上游厂坝间在一定范围内连接加固，虽然解决了厂房上游一阶频率与转频的共振问题，但对下游结构作用不明显，因此需要对厂房下游结构的加固作进一步的研究。 加固工程本身要考虑施工可行性、经济性，同时兼顾建筑美观、设备放置和电站运行等条件，在不同程度上限制了加固设计空间。在设计空间受到多种限制下，要使厂房的多阶频率同时与振源频率错开，给经验试算的分析方法带来了很大的困难。本文把ANSYS的模态分析、优化设计、子结构等主要功能进行了合理整合，在满足精度的前提下，提高了工作效率，节省了机器内存。首先，针对以往计算中，部分模型参数模拟不准确的问题，根据现场实测数据，运用ANSYS优化功能对混凝土动弹模和屋顶桁架杆的轴向刚度进行了反演，用反演的参数结果建立模型进行模态分析与实测数据符合较好。在合理建模的基础上，提出了多种优化模型，采用多目标优化方法，证明了每种优化模型一阶频率错开禁区情况下，二阶频率错开禁区的最大可能性，得到了在此情况下的最优解，很多分析表明，优化往往得到经验试算意想不到的结果。最后得到了不同控制因素，不同目标函数及其组合下的最优解和多种结构参数对频率的灵敏度曲线，为具体加固工程提供了有益的参考。在大量的优化分析基础上，综合考虑其它方面的因素，找到了一种经济、有效、可行的方案，很好地解决了红石厂房下游抗振加固问题。 本文的计算及理论分析均与实际在建及运行工程相结合，有着很大的实际应用价值，对其它水电站的建设、运行、管理也有较高的参考价值。更多还原

【Abstract】 The vibration of unit of Hongshi hydropower station causes violent vibration of the plant and the dam, which has not been occurred interiorly before. And such serious vibration has not been found according to foreign literature. With such serious vibrating for long time, the pillar , the door and the window of the plant appears horizontal and sorrounding crack, the safety of the hydropower station has been threatened. By the data observed on-site, it indicate that the reinforcing plan which the plant to disembark and the dam to be connected has solved the problem that the plant to disembark occurs resonance vibration with the frequency of the turbogenerator units, but the problem of resonance vibration of the downriver structure of the plant has not been solved, hence the study of the reinforce structure of the downriver plant must be made.In the reinforce engineering, it must be took into account such as the construction feasibility, economy, equipment placement and so on, the design space is limit. It is very difficult to solve the problem to make several frequency stagger the frequency of the main vibration sources with the experience analysis method. In this paper, many main functions such as mode analysis, optimum design, substructure analysis are combined in reason to meet precision, save EMS memory, improve efficiency. Begin for the problem that some parameters can not be simulated exactly before, according to the data observed on-site, the dynamic elastic modulus and the elastic modulus of the spar of the rooftop has been reckoned in reverse with the function of ANSYS optimum . design. Based on that the model is built in reason, many optimum model are built, the possibility that the second frequency staggers the vibration sources when the first frequency has staggered the vibration sources with many object optimum design method, the results under the most possibility are made. The acuity curves of every structure parameter to frequency. Finally, a feasible, economic, available plan is, found, the problem that resonance vibration of the downriver structure of the plant has commendably been solved.The computation and the theoretical analysis in this paper are both integrated with actual project which is running or being built, which has good practical applying value and good value to constructing and running other hydropower stations.更多还原