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针对薄壁真空室的使用特点,首先利用ANSYS有限元软件进行结构优化设计。其次通过理论计算和数值模拟相结合的方法计算出真空室烘烤功率,并给出在达到热平衡后真空室的温度分布规律。此外采用间接耦合法得到薄壁真空室在热-结构耦合状态下的变形及应力分布规律,结果表明升温阶段损失功率随时间而逐渐增加,真空室达到热平衡后损失功率保持恒定;仅大气压作用下真空室被压缩,高度方向的变形占主导地位,在烘烤过程中热载荷带来的影响较大,真空室长度方向的变形占主导地位;由于气体载荷和热载荷在某一点处所引起的应力方向不一致,所以真空室在热-结构耦合作用下的最大应力不是各个载荷应力值的线性叠加。
According to the characteristics of thin-walled vacuum chamber, the structural optimization design is firstly carried out by ANSYS finite element software. Secondly, the baking power of the vacuum chamber was calculated by the combination of theoretical calculation and numerical simulation, and the temperature distribution of the vacuum chamber was given after reaching the thermal equilibrium. In addition, the deformation and stress distribution of thin-walled vacuum chamber under thermo-structural coupling are obtained by indirect coupling method. The results show that the power loss increases gradually with time and the power loss remains constant after the vacuum chamber reaches thermal equilibrium. Under atmospheric pressure The vacuum chamber is compressed and the deformation in the height direction dominates. The influence of the thermal load in the baking process is larger and the deformation in the length direction of the vacuum chamber dominates. Due to the stress caused by the gas load and the heat load at a certain point Direction is not consistent, so the maximum stress of the vacuum chamber under the thermo-structure coupling is not a linear superposition of each load stress value.