核电站半速汽轮发电机基座设计探讨

Research on Design of Turbine Generator Foundation in Nuclear Power Plants

当机器制造厂家提供不平衡荷载时,我国《动力机器基础设计规范》(GB 50040—1996)和德国DIN 4024-1规范都规定应在强迫振动计算时采用不平衡荷载,若厂家未提供则可依据厂家提供的转子重量计算各轴承点处的不平衡荷载,在实际设计过程中发现,采用这些荷载并根据厂家提供的参考外型建模计算得出的基座振动位移或均方根速度往往会大大超出规范允许的限值。介绍了一个核电厂汽机基础设计实例,论述了当振动计算超标时,在进行基座结构设计时应采取的调整措施。

Both the Code for design of dynamic machine foundation （GB 50040--1996） and Machine foundation DIN 4024 Part1 says, if unbalanced force has been provided by the machine manufacturer, they may be used to establish displacements and forces using the model formed to determine natural frequencies. In the absence of such information, the forces may be calculated in accordance with the relevant codes. However, during the process of a real dynamic foundation design, the unbalanced force determined by the method above may lead to a over vibrating foundation, with the foundation shape also provided by the manufacturer. This paper introduced a real design case, provide the right method the designer should make when he comes into such a problem.