利用有限元分析评估螺旋 TWT 相互电路的热结构可靠性

P. Rocci
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引用次数: 22

摘要

采用有限元分析技术对大功率、宽带、螺旋行波管相互作用(慢波)电路的热载荷力学性能进行了分析。稳态传热分析使用计算的散热和边界温度进行,这些数据是通过行波管制造商提供的数据获得的。该分析的结果温度被用作一个较小模型的线性静态分析的加载条件,该模型代表电路的12转部分。所研究的失效模式是螺旋带的开裂和支撑杆由于过高的热应力而断裂。螺旋带的断裂会导致开路,而支撑杆的断裂会在慢波结构中引起微小的机械扰动,这可能会反射射频信号。这两种情况都可能导致行波管的电气故障。衰减截面的静态应力分析表明,由于这种特殊的温度梯度,螺旋和支撑杆中的应力水平在可接受的范围内,如果这些部件没有初始裂纹或缺陷,则不会断裂。通过螺旋的应力足以形成裂纹,但是这些裂纹的长度很短,不会影响螺旋的使用寿命。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal-structural reliability assessment of helix TWT interaction circuit using finite element analysis
Finite element analysis (FEA) techniques were used to assess the mechanical performance due to thermal loading of a high power, wide band, helix traveling wave tube's interaction (slow wave) circuit. A steady state heat transfer analysis was performed using calculated heat dissipations and boundary temperatures that were obtained through data supplied by the TWT's manufacturer. The resulting temperatures from this analysis were used as loading conditions in a linear static analysis of a smaller model which represents a 12 turn section of the circuit. The failure modes investigated were cracking of the helix tape and fracture of the support rods due to excessive thermal stresses. Cracking of the helix tape would cause an open-circuit to occur while fracture of the support rods could cause small mechanical perturbations in the slow wave structure which may reflect the RF signal. Both cases could possibly lead to electrical failure of the TWT. Static stress analysis of the attenuation section indicated that the stress levels in the helix and support rods due to this particular temperature gradient were within acceptable limits and would not fracture if these components were free of initial cracks or flaws. Stresses through the helix were sufficient to nucleate cracks, however the length of these cracks would be minute and would not affect the useful life of the helix.<>
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