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)
作者单位
王建 1.成都航空职业技术学院 航空工程学院,成都 610100 
沙云东 2.沈阳航空航天大学 辽宁省航空推进系统先进测试技术重点实验室,沈阳 110136 
杜英杰 1.成都航空职业技术学院 航空工程学院,成都 610100 
顾菘 1.成都航空职业技术学院 航空工程学院,成都 610100 
孙智超 1.成都航空职业技术学院 航空工程学院,成都 610100 
AuthorInstitution
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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