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一、实验意义在水电站中,机座(机墩)是竖轴发电机的支承结构,其底部与蜗壳顶板联成一体。在大、中型水电站中,机座的结构型式多采用园筒式,特点是刚度大,抗扭抗震性能好。竖轴式水轮发电机基础的结构设计,目前由于试验研究工作做得极少,因此现有计算一直采用几十年前的一套旧的方法,计算误差大,比较落后。众所周知,机座是一个空间结构,由于它本身质量很大,因此它的自振频率的计算就远远不象现有计算方法那么简单。但单从理论上来解决这一问题,在目前尚有一定的困难。由于基座的结构形式及受力情况都比较复杂,也就是说用数解法寻求精确解答时,其边介条件相当复杂,所以从实验角度来探讨这一
First, the experimental significance In the hydropower station, the base (machine pier) is a vertical axis generator support structure, the bottom of the volute roof together into one. In large and medium-sized hydropower stations, the structure of the machine type and more use of the cylinder, characterized by large stiffness, good torsional and seismic performance. The structural design of the foundation of vertical shaft hydroelectric generator has been done very little in the field of experimental research. Therefore, the existing calculation has been using a set of old methods which was several decades ago, and the calculation error is relatively large and relatively backward. As we all know, the base is a spatial structure, because of its very own mass, so its natural frequency calculation is far less than the existing calculation method so simple. However, there is still some difficulty in resolving this issue from the theoretical point of view. Due to the structure of the pedestal and the force situation are more complex, that is to say the number of solutions to seek accurate solutions, the side conditions are quite complex, so from an experimental point of view to explore this