Study on Fatigue Load Dispersion and Relevant Fatigue Dispersion Coefficients of Aircraft Engines
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摘要: 为了科学评价航空发动机疲劳载荷分散性,假设任务混频固定,考虑飞行员技术差异的影响,构建了基于飞行剖面的矩阵式载荷库,建立了航空发动机载荷分散性对应的疲劳分散系数的计算模型,并通过算例分析和Monte Carlo仿真验证了模型的有效性。研究表明:航空发动机全寿命期累积疲劳载荷强度服从正态分布,累积疲劳载荷分散性随载荷库载荷强度分散性的增大而增大,随发动机寿命周期的增大而减小;航空发动机载荷分散性对应的疲劳分散系数随载荷库载荷强度变异系数的增大而增大,随发动机寿命周期的增大而减小,随载荷强度可靠度要求的提高而增大。Abstract: In order to evaluate the fatigue load dispersion of aircraft engines, assuming the mixing and fixed frequency task, and considering the influence of technique differences among aviators, we construct a matrix aggregate of loads based on the flight profiles, and build a model for fatigue dispersion coefficients to correlate fatigue load dispersion of aircraft engines. The validity of the present model was validated with the example analysis and computer simulation via Monte Carlo method. It was shown that accumulative fatigue loads of aircraft engines in life period submit to normal distribution. Fatigue load dispersion increases with the increasing of load dispersion of load aggregate, whereas if decreases with the increasing of lifetime. Fatigue dispersion coefficients correlating fatigue load dispersion of aircraft engines increases with the increasing of load dispersion of load aggregate and the requirement of reliability, whereas if decreases with increasing of lifetime.
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Key words:
- aircraft engines /
- dispersion coefficient /
- dispersion /
- fatigue load /
- lifetime
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[1] Orsagh R, Roemer M, Sheldon J, et al. A comprehensive prognostics approach for predicting gas turbine engine bearing life[R]. ADA497770, 2004 [2] 张宝成,刘孝安.航空发动机可靠性和经济性[M].北京:国防工业出版社,1998 Zhang B C, Liu X A. Aero engine reliability and economy[M]. Beijing:National Defend Industry Press, 1998(in Chinese) [3] Wong J S, Scanlan J P, Eres M H. A systems engineering approach to aero-engine life cycle costing[C]//Proceedings of the 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. Orlando, Florida:AIAA, 2010:1-9 [4] 国防科学技术工业委员会.GJB 67.6-1985军用飞机强度和刚度规范:可靠性要求和疲劳载荷[S].北京:国防科学技术工业出版社,1986:3-4 Notional Defence Commision of Science Technology and Industry. GJB 67.6-1985 Military airplance strength and rigidity specification Reliability requirements and fatigue loads[S]. Beijing:Commission of Science Technology and Industry for National Defense, 1986:3-4(in Chinese) [5] Shiao M C, Chamis C C. Probability of failure and risk assessment of propulsion structural components[R]. Cleveland, OH:NASA, 1989 [6] 苏清友.航空涡喷、涡扇发动机主要零部件定寿指南[M].北京:航空工业出版社,2004 Su Q Y. Aviation turbojet, turbofan engine main parts life guide[M]. Beijing:Aviation Industry Press, 2004(in Chinese) [7] 陆山,吕文林.轮盘低周疲劳寿命可靠性分析新方法[J].航空学报,1997,18(2):135-138 Lu S, Lü W L. New method for reliability analysis of discs' LCF life[J]. Acta Aeronautica et Astronautica Sinica, 1997,18(2):135-138(in Chinese) [8] 高阳,白广忱,张瑛莉.涡轮盘多轴低循环疲劳寿命可靠性分析[J].航空学报,2009,30(9):1678-1682 Gao Y, Bai G C, Zhang Y L. Reliability analysis of multiaxial low cycle fatigue life for turbine disk[J]. Acta Aeronautica et Astronautica Sinica, 2009,30(9):1678-1682(in Chinese) [9] 王智,刘文珽,王磊.单机结构疲劳分散系数研究[J].机械强度,2009,31(1):150-154 Wang Z, Liu W T, Wang L. Study on fatigue scatter factor of individual aircraft structure[J]. Journal of Mechanical Strength, 2009,31(1):150-154(in Chinese) [10] 贺小帆,董彦民,刘文珽.结构和载荷谱分散性分离的疲劳寿命可靠性[J].航空学报,2010,31(4):732-737 He X F, Dong Y M, Liu W T. Reliability analysis on fatigue life with separated structural and load spectrum scatters[J]. Acta Aeronautica et Astronautica Sinica, 2010,31(4):732-737(in Chinese) [11] 阎楚良,张书明,叶舸,等.中值随机载荷谱数据处理专家系统[J].北京航空航天大学学报,2000,26(4):428-431 Yan C L, Zhang S M, Ye G, et al. Data treatment expert system for median stochastic load-spectrum[J]. Journal of Beijing University of Aeronautics and Astronautics, 2000,26(4):428-431(in Chinese) [12] 刘祁,何琳,束立红.随机载荷下疲劳寿命预估计算方法研究[J].海军工程大学学报,2002,14(2):31-33,50 Liu Q, He L, Shu L H. Research on an efficient calculating method for fatigue life predicting under random loading[J]. Journal of Naval University of Engineering, 2002,14(2):31-33,50(in Chinese) [13] 冯振宇,诸德培,林富甲.随机载荷下疲劳寿命的估算[J].机械科学与技术,1996,15(6):879-882 Feng Z Y, Zhu D P, Lin F J. Fatigue life prediction under random loads[J]. Mechanical Science and Technology, 1996,15(6):879-882(in Chinese) [14] 赵福星,吕玉泽,郑小梅,等.基于固定任务混频的寿命相关载荷分布特性[J].航空动力学报,2013,28(1):32-37 Zhao F X, Lü Y Z, Zheng X M, et al. Distribution characteristic of durability load based on fixed task frequency mixing[J]. Journal of Aerospace Power, 2013,28(1):32-37(in Chinese) [15] 王通北,陈美英.发动机零件的低循环疲劳寿命消耗和循环换算率[J].航空发动机,1995,(1):10-18 Wang T B, Chen M Y. The consumption and conversion rate of low cycle fatigue life of engine parts[J]. Aeroengine, 1995,(1):10-18(in Chinese) [16] NATO Research and Technology Organization Neuilly-Sur-Seine. Recommended practices for monitoring gas turbine engine life consumption[R]. ADA380949, 2000
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