摘要
针对半正弦冲击波形峰值幅度的计算,提出了一种基于残周期正弦曲线拟合的最小二乘计算方法,通过在脉冲测量波形中截取峰值附近近似于半正弦部分的峰值波形,使用残周期正弦曲线拟合方法计算获得冲击峰值幅度。它具有操作简捷易行、收敛性好的特点,并可以通过拟合残差有效值来判定拟合效果的优劣。该方法直接使用截取的峰值波形原始数据进行计算,不需要用滤波器对波形数据进行预处理,从而避免了冲击计量中常用的数字滤波给峰值计算结果带来的影响,可以获得更加客观准确的校准结果。通过在实际校准实验波形上的计算,并与以往计算方法进行了比较,验证了所述方法的有效性和切实可行性。
Aiming at the peak calculation of half-sine style impulse,a novel calculation method based on partial sinusoidal curve-fitting was presented.A half-sine wave part near the impulse peak was taken out from acquisition data, and then the partial sinusoidal curve-fitting was applied to get the impulse peak value.The method has the specialties of being easy to use,good convergence,and so on.Through the curve-fitting error analysis,one can compare the different curve-fitting results,and know which is better.The method presented uses the sampling data to calculate the impulse peak directly,without any filtering for pre-pressing,so,it can attain the more precise and more impersonal peak results.In a group of impulse calibration experiments,comparing with traditional methods,both the correctness and the feasibility of the pulse peak calculation method were proved.
出处
《振动与冲击》
EI
CSCD
北大核心
2015年第1期49-52,共4页
Journal of Vibration and Shock
关键词
脉冲
峰值幅度
正弦曲线拟合
参数估计
校准
评价
impulse
peak amplitude
sinusoidal curve-fitting
parameter estimation
calibration
evaluation
