王建,沙云东,杜英杰,顾菘,孙智超.热声复合环境下薄壁锥壳结构响应计算与疲劳寿命预估[J].装备环境工程,2018,15(12):91-97. WANG Jian,SHA Yun-dong,DU Ying-jie,GU Song,SUN Zhi-chao.Response Calculation and Fatigue Life Prediction of Thin-walled Conical Shell Structures under Thermal-acoustic Complex Environment[J].Equipment Environmental Engineering,2018,15(12):91-97. |
热声复合环境下薄壁锥壳结构响应计算与疲劳寿命预估 |
Response Calculation and Fatigue Life Prediction of Thin-walled Conical Shell Structures under Thermal-acoustic Complex Environment |
投稿时间:2018-07-25 修订日期:2018-12-25 |
DOI:10.7643/ issn.1672-9242.2018.12.017 |
中文关键词: 热声环境 锥壳结构 疲劳寿命 耦合的有限元/边界元 改进的雨流计数法 |
英文关键词:thermal-acoustic environment conical shell structure fatigue life coupled FEM/BEM method improved rain flow counting method |
基金项目:四川省教育厅自然科学项目(No. 18ZB0057);成都航空职业技术学院自然科学项目(No. 061754);四川省科技计划项目(No. 2018SZ0357) |
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Author | Institution |
WANG Jian | 1. Department of Aircraft Maintenance Engineering, Chengdu Aeronautic Polytechnic, Chengdu 610100, China |
SHA Yun-dong | 2. Liaoning Key Laboratory of Advanced Test Technology for Aeronautical Propulsion System, Shenyang Aerospace University, Shenyang 110136, China |
DU Ying-jie | 1. Department of Aircraft Maintenance Engineering, Chengdu Aeronautic Polytechnic, Chengdu 610100, China |
GU Song | 1. Department of Aircraft Maintenance Engineering, Chengdu Aeronautic Polytechnic, Chengdu 610100, China |
SUN Zhi-chao | 1. Department of Aircraft Maintenance Engineering, Chengdu Aeronautic Polytechnic, Chengdu 610100, China |
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中文摘要: |
目的 研究热声复合环境下薄壁锥壳结构的动力学响应与疲劳寿命。方法 采用耦合的有限元/边界元法,完成不同热声载荷下的振动应力计算。基于改进的雨流计数法,对不同热声载荷下危险点位置及典型位置的疲劳寿命进行预估。结果 屈曲前随温度的增加,薄壁锥壳结构的基频降低,屈曲后在一定温度范围内时,基频增加。薄壁锥壳结构的应力集中主要出现在孔边位置,基频在热声激励响应中起主导作用。低阶固有频率处存在较大峰值,高阶频带范围内的峰值较小,模态密度较高。结论 在800~1000 ℃的温度载荷与强声载荷下,薄壁锥壳结构的疲劳寿命只能维持几个小时,所以在抗声疲劳结构设计中要考虑响应谱的频率结构,及注重结构孔边位置的结构设计。 |
英文摘要: |
Objective To study dynamic response and fatigue life of thin-walled conical shell structures in a thermal-acoustic complex environment. Methods The coupled finite element/boundary element (FEM/BEM) method was used to calculate the vibration stress under different thermal-acoustic loads. Based on the improved rain flow counting method, the fatigue life of the dangerous points and typical locations under different thermal-acoustic loads were estimated. Results The fundamental frequency of the thin-walled conical shell structure decreased firstly with the increase of the temperature before bending and then increased in certain temperature range after bending. The stress concentration of the thin-walled conical shell structure mainly occurred at the edge of the hole. The fundamental frequency played a dominant role in the thermal-acoustic excitation response. There were large peaks at the low-order natural frequencies and small peaks in the high-order frequency band with high modal density. Conclusion In thermal environment from 800 ℃ to 1000 ℃, the fatigue life can only be reached for a few hours, when the structures bear the strong acoustic loads. Hence, in the anti-acoustic fatigue structural design, the frequency distribution of the response spectrum should be considered, and it is important to pay more attention to design of structural hole edge. |
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