基于静强和寿命可靠性的双辐板涡轮盘/榫结构优化设计方法
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摘要
为保证双辐板涡轮盘/榫结构疲劳寿命及可靠性,提出基于静强和寿命可靠性的涡轮盘/榫结构优化设计方法.采用盘身轴对称模型和涡轮盘/榫三维模型交替优化策略,进行轮盘静强结构优化.结合材料应力-寿命数据,对满足静强准则的涡轮盘/榫结构进行考虑尺寸效应的寿命可靠性分析,并建立各危险区域给定可靠度的峰值应力-寿命曲线.基于涡轮盘/榫静强优化设计平台,利用给定可靠度的应力-寿命曲线数据修改结构优化单点应力标准.在保证不出现轮盘破裂的前提下,将轮盘寿命可靠性优化的复杂过程简化为基于应力标准的寻优过程.典型例优化结果表明:静强优化后涡轮盘/榫的寿命不能满足设计要求;经寿命可靠性优化后,轮盘疲劳寿命较优化前增加了47.28%,满足寿命可靠性设计要求;且在轮盘静强优化质量减轻16.66%的基础上,再减轻3.43%;该方法在保证优化精度的条件下,可大幅提高优化效率,且易于工程设计中应用.
In order to guarantee the fatigue life reliability of twin-web turbine disk/tenon,a method of optimization design based on static strength and life reliability was put forward.With introduction of the optimization strategy of the disk's axisymmetric model and the turbine disk/tenon three-dimensional model in turn,the static strength optimization was in progress.According to the material stress-life data,the life reliability of turbine disk/tenon structure already meeting the static strength criteria was analyzed in consideration of the size effect.Stress-life curves of different zones for a given reliability were established.The point stress criterion of the static strength optimization was modified according to the stresslife curves.On the premise that the disk wasn't broken,the complex optimization process based on life reliability was simplified based on stress standard.A typical example showed that the static strength optimization result could not meet the design requirements of life reliability.Through the life reliability optimization design,the structural life was prolonged by 47.28 % and met the design requirement of reliability life.And on the basis of the turbine disk/tenon mass reduction by 16.66% during the static strength optimization,the total mass reduced 3.43% in life reliability optimization again.Under the conditions of ensuring the ac-curacy of the optimization.The method can significantly improve the optimization efficiency,enabling convenient engineering applications
In order to guarantee the fatigue life reliability of twin-web turbine disk/tenon,a method of optimization design based on static strength and life reliability was put forward.With introduction of the optimization strategy of the disk's axisymmetric model and the turbine disk/tenon three-dimensional model in turn,the static strength optimization was in progress.According to the material stress-life data,the life reliability of turbine disk/tenon structure already meeting the static strength criteria was analyzed in consideration of the size effect.Stress-life curves of different zones for a given reliability were established.The point stress criterion of the static strength optimization was modified according to the stresslife curves.On the premise that the disk wasn't broken,the complex optimization process based on life reliability was simplified based on stress standard.A typical example showed that the static strength optimization result could not meet the design requirements of life reliability.Through the life reliability optimization design,the structural life was prolonged by 47.28 % and met the design requirement of reliability life.And on the basis of the turbine disk/tenon mass reduction by 16.66% during the static strength optimization,the total mass reduced 3.43% in life reliability optimization again.Under the conditions of ensuring the ac-curacy of the optimization.The method can significantly improve the optimization efficiency,enabling convenient engineering applications
引文
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[12]陆山,张鸿,唐俊星,等.考虑尺寸效应的轮盘应力疲劳概率寿命分析方法[J].航空动力学报,2011,26(9):2040-2043.LU Shan,ZHANG Hong,TANG Junxing,et al.Analysis method for the stress fatigue probability life of a disk considering size effect[J].Journal of Aerospace Power,2011,26(9):2040-2043.(in Chinese)
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[14]张鸿.FGH96盘LCF概率寿命体方法分析及模拟件试验研究[D].西安:西北工业大学,2011.ZHANG Hong.Volume method analysis for low cycle fatigue reliability of FGH96disk and research on experiment of simulate specimen[D].Xi'an:Northwestern Polytechnical University,2011.(in Chinese)
[15]鲁华平,陆山,唐俊星.非对称循环疲劳寿命研究及涡轮盘概率寿命分析[J].机械强度,2007,29(1):92-96.LU Huaping,LU Shan,TANG Junxing.Research on the unsymmetrical cyclic fatigue life and reliable life analysis of a turbine disk[J].Journal of Mechanical Strength,2007,29(1):92-96.(in Chinese)
[2]杨喜关,罗贵火.某涡轮盘应力计算及优化设计分析[J].现代机械,2008(4):12-14.YANG Xiguan,LUO Guihuo.The stress calculation and the optimizing designing of a turbine disc[J].Modern Machinery,2008(4):12-14.(in Chinese)
[3]陶冶,陆山.涡轮盘/榫整体结构优化设计方法[J].航空动力学报,2012,27(6):1249-1254.TAO Ye,LU Shan.Method of structural optimization design for turbine disk/tenon[J].Journal of Aerospace Power,2012,27(6):1249-1254.(in Chinese)
[4]李荐名.预定寿命设计与等寿命设计的理论及方法研究[J].机械设计与制造,2002(5):2-3.LI Jianming.The theoretic and method of pre-design life and equivalent life design[J].Mechinery Design and Manufacture,2002(5):2-3.(in Chinese)
[5]CAIRO R R.Twin-web rotor disk:US005961287A[P].2005-11-23.
[6]CAIRO R R,SARGENT K A.Twin web disk:a step beyond convention[J].Journal of Engineering for Gas Turbines and Power,2002,124(2):298-302.
[7]王营,余朝蓬.航空发动机涡轮盘结构优化设计[J].机械设计与制造,2010(5):4-6.WANG Ying,YU Zhaopeng.Optimization design for the turbine disk of a gas engine[J].Machinery Design and Manufacture,2010(5):4-6.(in Chinese)
[8]栾永先.双辐板涡轮盘结构强度分析[J].航空发动机,2012,38(5):38-41.LUAN Yongxian.Structure strength analysis dual-web turbine disk[J].Aeroengine,2012,38(5):38-41.(in Chinese)
[9]陆山,李伦未.航空发动机高负荷涡轮盘双辐板结构优化设计[J].推进技术,2011,32(5):631-636.LU Shan,LI Lunwei.Twin-web structure optimization design for heavy duty turbine disk based for aero-engine[J].Journal of Propulsion Technology,2011,32(5):631-636.(in Chinese)
[10]高阳,杨昌军,白广忱,等.涡轮盘低循环疲劳可靠性设计方法[J].航空发动机,2011,37(1):3-7.GAO Yang,YANG Changjun,BAI Guangchen,et al.Reliability design of turbine disk low cycle fatigue[J].Aeroengine,2011,37(1):3-7.(in Chinese)
[11]吕文林.航空涡喷、涡扇发动机结构设计准则(研究报告):第2册轮盘[R].北京:中国航空工业总公司发动机系统工程局,1997.
[12]陆山,张鸿,唐俊星,等.考虑尺寸效应的轮盘应力疲劳概率寿命分析方法[J].航空动力学报,2011,26(9):2040-2043.LU Shan,ZHANG Hong,TANG Junxing,et al.Analysis method for the stress fatigue probability life of a disk considering size effect[J].Journal of Aerospace Power,2011,26(9):2040-2043.(in Chinese)
[13]《航空发动机设计用材料数据手册》编委会.航空发动机设计用材料数据手册:第4册[M].北京:航空工业出版社,2010.
[14]张鸿.FGH96盘LCF概率寿命体方法分析及模拟件试验研究[D].西安:西北工业大学,2011.ZHANG Hong.Volume method analysis for low cycle fatigue reliability of FGH96disk and research on experiment of simulate specimen[D].Xi'an:Northwestern Polytechnical University,2011.(in Chinese)
[15]鲁华平,陆山,唐俊星.非对称循环疲劳寿命研究及涡轮盘概率寿命分析[J].机械强度,2007,29(1):92-96.LU Huaping,LU Shan,TANG Junxing.Research on the unsymmetrical cyclic fatigue life and reliable life analysis of a turbine disk[J].Journal of Mechanical Strength,2007,29(1):92-96.(in Chinese)