枪托连续冲击作用下的人体参数辨识
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摘要
针对枪托连续冲击作用下人体系统参数随时间变化的特点,提出了一种人体物理参数辨识方法。该方法通过正交化经验模态分解和Hilbert变换构建输入和输出信号的解析信号。通过推导含参数变量的解析信号方程并计算求解获得人体参数随时间的变化曲线。表面肌电实验结果证明了该方法的有效性。辨识结果表明,该方法获得的连续冲击作用下人体等效刚度和等效阻尼参数曲线与生物学知识相符,具有重要意义。
A parameter identification method of human body under successive impact is proposed,considering the variation of the parameters over time. Orthogonal empirical mode decomposition( OEMD) and Hilbert transform are used in the method to build the analytic signals of input and output signals. The equation of analytic signals with variable parameters is derived,and the human body parameters changing with time are calculated. Surface electromyography experimental results show that the proposed method is effective. Identification result shows that the equivalent stiffness and equivalent damping parameters of human body under successive impact obtained in this paper are consistent with biology.
A parameter identification method of human body under successive impact is proposed,considering the variation of the parameters over time. Orthogonal empirical mode decomposition( OEMD) and Hilbert transform are used in the method to build the analytic signals of input and output signals. The equation of analytic signals with variable parameters is derived,and the human body parameters changing with time are calculated. Surface electromyography experimental results show that the proposed method is effective. Identification result shows that the equivalent stiffness and equivalent damping parameters of human body under successive impact obtained in this paper are consistent with biology.
引文
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[2]包建东,王昌明,何云峰.人-枪模型的建立及仿真分析[J].兵工学报,2009,30(5):513-517.BAO Jian-dong,WANG Chang-ming,HE Yun-feng.Foundation of man-gun model and simulation analysis[J].Acta Armamentarii,2009,30(5):513-517.(in Chinese)
[3]孔德仁,孙海波,李永新,等.枪肩系统机构导纳分析[J].南京理工大学学报,1997,21(5):441-444.KONG De-ren,SUN Hai-bo,LI Yong-xin,et al.Mechanical admittance analysis of rifle-shoulder system[J].Journal of Nanjing University of Science and Technology,1997,21(5):441-444.(in Chinese)
[4]王亚平,徐诚,郭凯.人枪系统建模及数值仿真研究[J].兵工学报,2002,23(4):551-554.WANG Ya-ping,XU Cheng,GUO Kai.Modeling and digital-simulation of a human-gun system[J].Acta Armamentarii,2002,23(4):551-554.(in Chinese)
[5]Huang N E,Shen Z,Long S R,et al.The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis[J].Proceedings of the Royal Society A-Mathematical Physical and Engineering Sciences,1998,454(1971):903-995.
[6]李鸿光,孟光.基于EMD方法的混沌信号中周期分量的提取[J].应用数学和力学,2006,27(2):199-203.LI Hong-guang,MENG Guang.Harmonic component extraction from a chaotic signal based on EMD method[J].Applied Mathematics and Mechanics,2006,27(2):199-203.(in Chinese)
[7]Huang N E,Shen Z,Long S R.A new view of nonlinear water waves:the Hilbert spectrum[J].Annual Review of Fluid Mechanics,1999,31(1):417-457.
[8]楼梦麟,黄天立.正交化经验模式分解方法[J].同济大学学报:自然科学版,2007,35(3):293-298.LOU Meng-lin,HUANG Tian-li.Orthogonal empirical mode decomposition[J].Journal of Tongji University:Natural Science,2007,35(3):293-298.(in Chinese)
[9]胡敬坤.轻武器射击平台的初步研究[D].南京:南京理工大学,2007.HU Jing-kun.Preliminary research of small arms firing platform[D].Nanjing:Nanjing University of Science and Technology,2007.(in Chinese)
[10]徐晴晴.基于改进经验模态分解的线性系统参数识别问题研究[D].南京:南京航空航天大学,2013.XU Qing-qing.Parameters identification for linear structures based on an improved EMD method[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2013.(in Chinese)
[11]Liu K.Identification of linear time-varying systems[J].Journal of Sound and Vibration,1997,206(4):487-505.
[12]Yang J N,Lei Y,Pan S,et al.System identification of linear structures based on Hilbert Huang spectral analysis.Part 1:normal modes[J].Earthquake Engineering and Structural Dynamics,2003,32(10):1443-1465.
[13]Shi Z Y,Law S S.Identification of linear time-varying dynamical systems using Hilbert transform and empirical mode decomposition method[J].Journal of Applied Mechanics,2007,74(2):223-230.
[14]Cohen L.Time-frequency analysis:theory and applications[M].New York:Prentice Hall,1995.
[15]Tzeren A.Human body dynamics:classical mechanics and human movement[M].New York:Springer-Verlag,1999.
[16]Panjabi M M.The stabilizing system of the spine.Part I:function,dysfunction,adaptation and enhancement[J].Journal of Spinal Disorders,2015,5(4):383-397.
[17]Vera-Garcia F J,Brown S H,Gray J R,et al.Effects of different levels of torso co-activation on trunk muscular and kinematic responses to posteriorly applied sudden loads[J].Clinical Biomechanics,2006,21(5):443-455.