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近年来,随着试验任务量的逐年递增,FL-24风洞整流锥承受越来越频繁的冲击载荷,导致多处焊缝开裂。为了确保整流锥的安全运行,对整流锥进行了多次改造。为了深化对整流锥结构特性的了解,对改造前后四种状态的整流锥进行有限元分析。研究表明:计算结果与实际损伤情况吻合;通过增加外筋板,显著提高了结构的轴向刚度,有效降低幅板前端与洞体连接处应力水平;通过增加锥体端部圆环,有效提高了结构的轴向刚度和锥体扭曲刚度,有效降低幅板后端与锥体连接处应力水平;通过增加内筋板,显著提高了结构轴向刚度和锥体扭曲刚度,明显降低二号均压孔前端和三号均压孔后端应力水平。最后,针对现有整流锥存在的薄弱环节,提出一种改进方案。
In recent years, with the increasing amount of test tasks, FL-24 wind tunnel coning cone to bear more and more frequent impact load, resulting in multiple weld cracking. In order to ensure the safe operation of the cone, the cone has been modified several times. In order to deepen the understanding of the structural characteristics of conical rectifiers, the finite element analysis of coning cones in the four states before and after the transformation was carried out. The results show that the calculated results are consistent with the actual damage situation. By adding the outer rib plate, the axial rigidity of the structure is significantly increased, and the stress level at the connection between the front end of the web plate and the hole body is reduced effectively. By increasing the annular ring at the cone end, The axial stiffness of the structure and the torsional stiffness of the cone are reduced effectively to reduce the stress level at the connection between the rear end of the web and the cone. By increasing the inner rib, the axial stiffness of the structure and the torsional stiffness of the cone are obviously increased, Pressure hole front and No. three pressure hole back stress level. Finally, aiming at the weak points of the existing coning cone, an improved scheme is proposed.