航空弹性并车机匣模态分析与结构参数优化OA北大核心CSTPCD
Modal analysis and structural parameter optimization of aviation elastic parallel casing
针对某型航空并车机匣的模态共振问题,考虑航空机架弹性支承刚度,采用有限元法进行典型工况下约束模态分析,研究了并车薄壁机匣结构参数对约束模态固有频率的影响规律.结果表明优化支承位置是大幅度改变固有频率最有效的方式;当固有频率处在共振区间边缘时,可通过优化壁厚、筋板的方法小幅度调整.当2个支承位置位于机匣平面对称轴线时,固有频率最小且随支承距离减小而减小.随着薄壁厚度增大,1、3、5、6阶模态频率减小,2、4阶增大.1、3阶模态频率基本不受筋板参数的影响;2、4阶模态频率随筋板宽度、高度增大和宽高比减小而增大且4阶频率随筋板角度增大而增大;5、6阶模态频率随筋板角度增大、筋板宽度减小而增大.在此基础上,对弹性并车机匣的结构参数进行优化使固有频率避开共振区间,提高了机匣的抗振能力.
To solve the resonance problem of an aviation parallel casing,the finite element method is used to analyze the constrained modal frequencies,considering typical working conditions and the elastic support stiffness of the aircraft frame. This study investigates the influence of casing structural parameters on the constrained modal frequencies. The results show that optimizing the constraint position is the most effective way to significantly change the natural frequencies. When the natural frequency is at the edge of the resonance intervals,it can be adjusted slightly by optimizing the wall thickness and stiffener parameters. When the two constraint positions are located on the symmetry axis of the casing plane,the natural frequencies reach their minimum and decrease obviously with a reduction in the constraint distance. With an increase of the thin-wall thickness,the 1st,3rd,5th and 6th modal frequencies decrease,while the 2nd and 4th modal frequencies increase. The 1st and 3rd modal frequencies are almost unaffected by the stiffener parameters. The 2nd and 4th modal frequencies increase with the increasing width and height of the stiffener and decreasing stiffener aspect ratio. In addition,the 4th modal frequency increases with the increasing angle of the stiffener. The 5th and 6th modal frequencies increase with an increasing stiffener angle and decreasing stiffener width. Based on these findings,the aviation elastic parallel casing was optimized to ensure the natural frequencies avoid the resonance intervals,thus improving the vibration resistance of the casing.
吴安阳;宋朝省;赵帅涛;邓自立
重庆大学机械传动国家重点实验室,重庆 400044
机械工程
弹性薄壁机匣约束模态固有频率结构优化减振设计
elastic thin-walled casingconstrained modalnatural frequenciesstructural optimizationvibration reduction design
《重庆大学学报》 2024 (009)
39-50 / 12
重庆市杰出青年科学基金资助项目(CSTB2022NSCQ-JQX0026).Supported by the Chongqing Science Foundation for Distinguished Young Scholars(CSTB2022NSCQ-JQX0026).
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