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针对某核级直立式主给水控制阀自振频率较低的问题,基于ASME规范和Femap+NX Nastran有限元平台,研究直立式核级阀门抗震性能评估与优化技术。通过对某型号控制阀试验数据和仿真数据的对比,验证了直立式阀门有限元分析技术的有效性。针对直立式控制阀门的结构特点,提出了直立式控制阀执行机构力学模型,研究了阀门支架关键结构参数对结构频率的影响规律,进而采用拓扑优化技术优化了阀门支架结构。最后,仿真结果表明所设计阀门整体自振频率大于33 Hz,具有良好抗震性能。
In view of the low natural frequency of a nuclear-level vertical main feedwater control valve, based on the ASME code and Femap + NX Nastran finite element platform, the seismic performance evaluation and optimization technology of a vertical nuclear-level valve is studied. By comparing the test data and simulation data of a certain type of control valve, the validity of finite element analysis technology of vertical valve is verified. According to the structural characteristics of the vertical control valve, the mechanical model of the vertical control valve actuator was proposed. The influence of the key structural parameters of the valve support on the structure frequency was studied. Then the topological optimization technology was used to optimize the valve support structure. Finally, the simulation results show that the overall design of the valve natural frequency greater than 33 Hz, with good seismic performance.