CAJ | 학술논문

采用合理有效的分解方法获得各路面噪声源对驾驶员耳旁噪声的贡献，对进行车内声学设计具有重要意义。基于多重相干理论，给出了汽车路面噪声多重相干分解方法的基本流程，并采用设定特征阈值去除小特征值的方法降低病态误差。某轿车的路面噪声分解试验显示：左前轮、左后轮、右前轮、右后轮是该轿车路面噪声的四个独立源，分解结果使驾驶员右耳处合成噪声与实测噪声在20～6400 Hz 频段内仅平均相差约0．4dB（A）。分解结果正确，为新车型的声学设计开发提供了数据源；多重相干方法简便、易用、有效、可靠，为汽车路面噪声的分解提供了有力工具。
채용합리유효적분해방법획득각로면조성원대가사원이방조성적공헌，대진행차내성학설계구유중요의의。기우다중상간이론，급출료기차로면조성다중상간분해방법적기본류정，병채용설정특정역치거제소특정치적방법강저병태오차。모교차적로면조성분해시험현시：좌전륜、좌후륜、우전륜、우후륜시해교차로면조성적사개독립원，분해결과사가사원우이처합성조성여실측조성재20～6400 Hz 빈단내부평균상차약0．4dB（A）。분해결과정학，위신차형적성학설계개발제공료수거원；다중상간방법간편、역용、유효、가고，위기차로면조성적분해제공료유력공구。
It is of great significance for interior acoustical design of a car for us to obtain each road noise source contribution to a driver's ear noise with a reasonable and effective decomposition method.Here,the multiple coherence decomposition method was utilized for road noise of a car,its basic procedure was given.Meanwhile,in order to reduce ill-condition error,some small eigenvalues of the cross-spectral matrix of input signals were restricted with a set threshold. Furthermore,a road noise decomposition test was conducted for a car.Results showed that the left front wheel,the left rear wheel,the right front wheel and the right rear wheel are four independent road noise sources;the mean difference between the noise near the right ear of the driver synthetized with the decomposed contributions and the measured one is only 0.4dB (A)within a range of 20 ~6 400 Hz;the correct decomposition provides data for the acoustical design of new cars;the multiple coherence decomposition method is simple,easy-to-use,effective and reliable,it provides a powerful tool for the decomposition of a car's road noise.