细长偏心舱体振动试验夹具设计分析与验证
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摘要
振动试验是考核航空航天产品可靠性与环境适应性的重要手段。针对某大型细长偏心舱体的振动试验,介绍了振动试验的二自由度系统理论模型,然后采用配重法设计了其振动试验夹具,并通过有限元软件ABAQUS分析了夹具在自由状态和连接试验件状态的模态参数和随机振动响应。结果表明,该夹具自由状态的1阶固有频率为198.6 Hz,连接试验件状态的1阶固有频率为202.1 Hz,最大放大因子为1.6,连接点加速度的最大偏差为31.4%,上述指标均符合振动试验夹具设计要求。最后用该夹具对细长偏心舱体进行了随机振动试验,试验控制平稳,偏差在容差范围内,验证了夹具设计的合理性。
Vibration test is an important way to examine reliability of aerospace products. For a large slender offcentre pod vibration test,the theory modal of two freedom vibration system is firstly introduced. Then,the vibration test fixture is designed with balance weight method. The modal parameters and random dynamic response of the fixture are analyzed using finite element software ABAQUS in both free state and test specimen joint state. The results indicate that first natural frequency of the fixture in free state is 198. 6 Hz. First natural frequency of test specimen joint state is 202.1 Hz. The amplification factor of the fixture is 1.6. The largest acceleration error from different joint points is 31.4%. Above-mentioned technique data meets the standards of vibration test fixture design.Finally,the vibration test for slender off-centre pod is carried out using the fixture,from which controlling is steady and errors are within the tolerance range. The rationality of the fixture is verified.
Vibration test is an important way to examine reliability of aerospace products. For a large slender offcentre pod vibration test,the theory modal of two freedom vibration system is firstly introduced. Then,the vibration test fixture is designed with balance weight method. The modal parameters and random dynamic response of the fixture are analyzed using finite element software ABAQUS in both free state and test specimen joint state. The results indicate that first natural frequency of the fixture in free state is 198. 6 Hz. First natural frequency of test specimen joint state is 202.1 Hz. The amplification factor of the fixture is 1.6. The largest acceleration error from different joint points is 31.4%. Above-mentioned technique data meets the standards of vibration test fixture design.Finally,the vibration test for slender off-centre pod is carried out using the fixture,from which controlling is steady and errors are within the tolerance range. The rationality of the fixture is verified.
引文
[1]《航空制造工程手册》总编委会.航空制造工程手册机载设备环境试验[M].北京:航空工业出版社,1995Aviation Manufacturing Engineering Hand Book Editoral Committee. Airborne equipment environment test[M].Beijing:Aviation Industry Press,1995(in Chinese)
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[10] Deprez K,Moshou D,Ramon H. Comfort improvement of a nonlinear suspension using global optimization and in situ measurements[J]. Journal of Sound and Vibration,2005,284(3-5):1003-1014
[11]王轲,孙妍妍,茅志颖.振动试验夹具动力学设计的综合优化方法[J].振动、测试与诊断,2013,33(3):483-487Wang K, Sun Y Y, Mao Z Y. Comprehensive optimization method for dynamic design of fixture of vibration test[J]. Journal of Vibration,Measurement&Diagnosis,2013,33(3):483-487(in Chinese)
[12]李威.空间光学遥感器振动夹具的设计与研究[J].光机电信息,2010,27(9):16-22Li W. Design and research of vibration tong for space optical remote sensor[J]. OME Information,2010,27(9):16-22(in Chinese)
[13]程来,宋言明,杨洋.机载装置的振动试验夹具设计[J].机械科学与技术,2012,31(6):910-914Cheng L,Song Y M,Yang Y. Design of fixture for airborne equipment in vibration test[J]. Mechanical Science and Technology for Aerospace Engineering,2012,31(6):910-914(in Chinese)
[14] Wu J Z,Zheng W Y,Zhao P T. Design and mode analysis of random vibration test fixture of some airborne heat exchanger[C]//Proceedings of 2016 IEEE International Conference on Aircraft Utility Systems.Beijing,China:IEEE,2016:1075-1078
[15]石元华,邓俊,田俊丰,等.采用邓柯莱法和瑞利法的振动夹具设计[J].重庆理工大学学报:自然科学版,2013,27(9):97-101Shi Y H,Deng J,Tian J F,et al. Design of vibration testing fixture based on the Dunkerley and the Rayleigh method[J]. Journal of Chongqing University of Technology:Natural Science,2013,27(9):97-101(in Chinese)
[2]柯受全,金恂叔.卫星环境工程和模拟试验[M].北京:宇航出版社,2006Ke S Q,Jin X S. Satellite environment engineering and simulation test[M]. Beijing:Aerospace Press,2006(in Chinese)
[3] Avitabile P. Why you can't ignore those vibration fixture resonances[J]. Sound and Vibration,1999,33:20-27
[4]胡志强,法庆衍,洪宝林,等.随机振动试验应用技术[M].北京:中国计量出版社,1996:108-118Hu Z Q,Fa Q Y,Hong B L,et al. Random vinration test technique[M]. Beijing:China Metrology Publishing House,1996:108-118(in Chinese)
[5] Kara B,Lee C. Design principles for vibration test fixtures[D]. Alabama:Worcester Polytechnic Institute,2011
[6] Reddy T S,Reddy K V K. Design and analysis of vibration test bed fixtures for space launch vehicles[J]. Indian Journal of Science&Technology,2010,3(5):592-595
[7] Klee B J,Klimball D V,Tustin W.振动、与冲击试验夹具设计[M].振动与冲击试验夹具设计翻译组,译.强度与环境编辑部,1979Klee B J, Klimball D V, Tustin W. Vibration and impact test fixture design[M]. Jig Translation Unit for Vibration Impact Test,trans. Structure and Environment Engineering Editorial Department,1979(in Chinese)
[8]顾松年,姜节胜,周苏枫.柔性夹具与环境振动试验[J].机械强度,2003,25(2):119-122Gu S N,Jiang J S,Zhou S F. Flexible clamp and enviroment vibration experiment[J]. Journal of Mechanical Strength, 2003,25(2):119-122(in Chinese)
[9]朱元夫.系统级产品振动试验仿真[J].强度与环境,2003,30(4):59-62,39Zhu Y F. Vibration test simulation for the complex structural system[J]. Structure&Environment Engineering,2003,30(4):59-62,39(in Chinese)
[10] Deprez K,Moshou D,Ramon H. Comfort improvement of a nonlinear suspension using global optimization and in situ measurements[J]. Journal of Sound and Vibration,2005,284(3-5):1003-1014
[11]王轲,孙妍妍,茅志颖.振动试验夹具动力学设计的综合优化方法[J].振动、测试与诊断,2013,33(3):483-487Wang K, Sun Y Y, Mao Z Y. Comprehensive optimization method for dynamic design of fixture of vibration test[J]. Journal of Vibration,Measurement&Diagnosis,2013,33(3):483-487(in Chinese)
[12]李威.空间光学遥感器振动夹具的设计与研究[J].光机电信息,2010,27(9):16-22Li W. Design and research of vibration tong for space optical remote sensor[J]. OME Information,2010,27(9):16-22(in Chinese)
[13]程来,宋言明,杨洋.机载装置的振动试验夹具设计[J].机械科学与技术,2012,31(6):910-914Cheng L,Song Y M,Yang Y. Design of fixture for airborne equipment in vibration test[J]. Mechanical Science and Technology for Aerospace Engineering,2012,31(6):910-914(in Chinese)
[14] Wu J Z,Zheng W Y,Zhao P T. Design and mode analysis of random vibration test fixture of some airborne heat exchanger[C]//Proceedings of 2016 IEEE International Conference on Aircraft Utility Systems.Beijing,China:IEEE,2016:1075-1078
[15]石元华,邓俊,田俊丰,等.采用邓柯莱法和瑞利法的振动夹具设计[J].重庆理工大学学报:自然科学版,2013,27(9):97-101Shi Y H,Deng J,Tian J F,et al. Design of vibration testing fixture based on the Dunkerley and the Rayleigh method[J]. Journal of Chongqing University of Technology:Natural Science,2013,27(9):97-101(in Chinese)