脉冲锤击的传递函数计算方法研究
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摘要
由于锤击激励跟响应的时间对应关系以及系统的非线性因素在传递函数计算中很难考虑,导致传递函数的估计误差很大。本文在选择合适的传递函数计算公式基础上,充分考虑激励信号与响应信号时间对应关系,建立了多次激励平均的脉冲锤击传递函数计算方法,并结合锤击激励信号、响应信号各自的自谱及它们的相干函数,确定出传递函数线性有效可用频段,使得脉冲锤击传递函数的估计更加系统和完善。另外仿真实验验证了此传递函数估计方法具有较高的估计精度。此方法的建立对于舰艇振动噪声传递的定量分析具有重要意义。
In the process of transfer function computation,it is difficult to consider the time corresponding relation between hammer impulses and responses,as well as the nonlinear factors of system,which leads to a large estimation error of the transfer function.Based on the appropriate selections of the transfer function formula,and sufficient considerations of the corresponding relation between the hammer impulses and the responses,a novel estimation method of the impulse hammer transfer function is proposed in this paper by averaging multiple excitations.Combined with the respective auto-spectrum and coherence function of the hammer impulses and the responses signals,the effective linear frequency bands are determined.The proposed method makes the estimation of the impulse hammer excitation transfer functions much more systematic,and perfect.The estimation method of transfer function possesses a higher estimation precision through simulation experiments.And it also possesses an important significance for the quantity analyses of naval ship vibration-noise-transfers.
In the process of transfer function computation,it is difficult to consider the time corresponding relation between hammer impulses and responses,as well as the nonlinear factors of system,which leads to a large estimation error of the transfer function.Based on the appropriate selections of the transfer function formula,and sufficient considerations of the corresponding relation between the hammer impulses and the responses,a novel estimation method of the impulse hammer transfer function is proposed in this paper by averaging multiple excitations.Combined with the respective auto-spectrum and coherence function of the hammer impulses and the responses signals,the effective linear frequency bands are determined.The proposed method makes the estimation of the impulse hammer excitation transfer functions much more systematic,and perfect.The estimation method of transfer function possesses a higher estimation precision through simulation experiments.And it also possesses an important significance for the quantity analyses of naval ship vibration-noise-transfers.
引文
[1]李海亮.地震计传递函数精确测定研究.中国地震局地球物理研究所博士学位论文[D].2000:54-60.
[2]孙京燕,陈道璋.用脉冲锤激励的实验模态分析[J].电子科技大学学报.1993,22(2):193-198.
[3]杜永峰,彭建平,李慧,等.利用Matlab和锤击法的线性结构阻尼试验[J].兰州理工大学学报,2005,31(6):115-118.
[4]钱济国.频响函数测量的脉冲激励方法[J],振动、测试与诊断.1994,14(2):32-39.
[5]段虎明,秦树人,李宁.频率响应函数估计方法综述[J].振动与冲击.2008,27(5):48-52.
[2]孙京燕,陈道璋.用脉冲锤激励的实验模态分析[J].电子科技大学学报.1993,22(2):193-198.
[3]杜永峰,彭建平,李慧,等.利用Matlab和锤击法的线性结构阻尼试验[J].兰州理工大学学报,2005,31(6):115-118.
[4]钱济国.频响函数测量的脉冲激励方法[J],振动、测试与诊断.1994,14(2):32-39.
[5]段虎明,秦树人,李宁.频率响应函数估计方法综述[J].振动与冲击.2008,27(5):48-52.
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