移动式高比刚度桁架四通优化设计研究

Research on Optimal Design of Mobile High-Specific Stiffness Trussed Center Block

针对移动式大口径光管,完成了高比刚度桁架四通的详细优化设计。采用有限元法,分析了32组方钢管对应四通的最大形变、最大应力、一阶模态频率、整体质量、光轴偏移角与壁厚的关系,再结合设计指标成功筛选出了最优方钢管的规格型号。同时采用控制变量法,保证质量相同的情况下将桁架式四通与板式四通进行了对比分析,结果表明桁架式相比板式在光轴偏移角上减小了1.15%,一阶模态频率上提高了89.19%,证明了桁架式结构的优越性。通过振动敲击实验测得桁架式四通的一阶模态频率为60.264 Hz,与仿真获得的63.385 Hz基本一致,证明了理论设计与仿真的准确性。通过长距离实际道路稳定性实验证明了该四通可以完全胜任项目的工程需求。

This paper executes a detailed optimization design of high-specific stiffness trussed center block for the mobile large-caliber light pipe.Utilizing the finite element method,the study analyzes the maximum deformation,maximum stress,first-order modal frequency,overall mass,optical axis shift angle,and wall thickness of 32 square steel pipes corresponding to the center block.By integrating these analyses with design criteria,the most suitable square steel pipe specifications are identified.Concurrently,the control variable method is employed to ensure a comparative analysis between the trussed center block and plate-type center block under equal mass conditions.The results indicate that the truss type exhibits a 1.15%reduction in optical axis shift angle and an 89.19%increase in first-order modal frequency,demonstrating the superiority of the truss structure.The first-order modal frequency of the trussed center block,measured at 60.264 Hz through vibration tap tests and 63.385 Hz via simulation,shows a strong correlation,validating the accuracy of theoretical design and simulation.Additionally,the trussed center block successfully meets project requirements,as confirmed by long-distance stability tests.