【摘要】 本文从理论上论证了观测响应中的噪声对ITD法模态识别精度的影响。对用扩阶数学模型降低噪声影响的理论依据作了数学证明,并提出采用扩阶数学模型时计算自由度数和响应矩阵列数选取的建议。提出了另一提高识别精度的方法——载波法,通过实例计算进一步说明了两种方法的有效性。更多还原

【Abstract】 The effect of survey noises on the identification precision of ITD method is analyzed. The theory base of decreasing the noise effects by meanse of the oversized mathematical model is mathematically proved. The proposals for deciding the numbers of the degrees of freedom and the columns of the response matrices is put forward. Another effective method, the earring wave method, is gived. The effectiveness of the two methods is illustrated by the identification examples.更多还原