分段拟合中消除段外模态影响的方法

A method for eliminating modal effects outside of fitting band during piecewise fitting

在整体正交多项式识别法的基础上,介绍了在分段拟合中消除段外模态影响的方法.通过对拟合频段外的低阶和高阶模态的分析和处理,提出用邻近拟合段前后两个频段中的模态来修正频响数据,并建立了曲线拟合模型.将该方法识别的结果与不考虑段外模态影响方法识别的结果相比较,结果表明该方法具有较好的计算精度.

Based on the global fraction orthogonal polynomial algorithm, a method for eliminating modal effects outside of fitting band is reviewed. Both lower and higher modes outside of the fitting band are analyzed and processed. The frequency response data are revised by means of modes in two frequency bands close to the fitting band, and a curve model is derived. The results from this method are compared with those of the traditional estimation without regard to the modal effects outside of the fitting band, and it is shown that the former is more accurate.