Source identification of interior noise of passenger car using MISO model

학위논문(석사) - 한국과학기술원 : 기계공학과, 1993.2, [ viii, 71 p. ]한국과학기술원 : 기계공학과

Source identification methods by multiple-input/single output modeling

학위논문(박사) - 한국과학기술원 : 기계공학과, 1998.2, [ xv, 137 p. ]한국과학기술원 : 기계공학과

Transfer Path Identification of Road Noise;Using Multiple Coherence Function and Relative Acceleration

Among the various sources of vehicle interior noise, this paper concerns the road induced noise ; the identification of its transfer path by using experimental method. Multiple input and single output model is taken as a noise generation model. Because it is impossible to measure the road imput forces directly, the acceleration signals are measured on four axle;three directions for each point. By considering the cross correlations of input signals, four uncorrelated source groups are taken. Multiple coherence function is employed to investigate the contribution of each group. In addtion, to identify the detailed path through the suspension systems, the contributions of all possible paths are ranked by using the coherence functions between interior noise and the relative accelerations of connections such as bushings and mountings. Measurements are performed with passenger vehicle traveling on concrete and asphalt roads at 60㎞/h