阻尼测量的数据处理和精度分析

本文提出了一种用曲线拟合的方法来处理由自由衰减振动阻尼测量得到的数据,并与对数减缩法作了比较,为了确定二种方法的精度和影响估计值误差的因素,在不同阻尼和噪声条件下进行了计算机模拟计算和给出了估计结果。结果表明,大多数条件下曲线拟合法比对数减缩法精确得多,以及对实际中最常遇见的阻尼值和信噪比,最佳估计的数据最优点数为20。

Data Process and Accuracy Analysis of Damping Measurement

A method of curve-fitting to process the data obtained from damping measurement of free decaying vibration is presented and compared with the logarithmic decrement method.In order to determine the accuracy of the two methods and the factors that influence the estimate error,a computer simul ation has been given and the results have been estimated under different conditions of damping and noise.It is shown that the curve-fitting method is more accurate than the logarithmic decrement method for most conditions and that for values of damping and signal to noise ratio most frequently encounteredi in practice,the optimum number of data points for which the best estimate is obtained is about 20.