Abstract
To quantitatively identify the transfer paths and evaluate path contributions of shell structures, an singular value decomposition- (SVD-) and principal component analysis- (PCA-) based operational transfer path analysis method is constructed and studied in this paper. Firstly, SVD is used to determine the contribution of each path and reduce crosstalk. Secondly, PCA is applied to reduce the influence of unwanted frequency components and thus reduce noises. This allows the presented OTPA to be more accurate than its traditional counterpart. Once the transmissibility function is obtained, the response synthesis is determined, and the transfer path analysis and path contribution evaluation can be effectively carried out. Numerical and experimental case studies are carried out to validate and test the performance of the presented method. Furthermore, a comprehensive observing the influences of correlation between sources and distance of sources and receiver is also provided. Generally, this paper provides accurate transfer path analysis and path contributions for mechanical systems, which can benefit vibration and noise monitoring and reduction through vibration reduction structure design for new equipment or vibration damping on the major vibration transfer paths for current equipment.
Highlights
Over the past decades, the demand for comfortable, silent, and stealthy technologies has extensively grown. e knowledge of transmission and distribution of vibration and noise signals, being the major concern while dealing with noise and vibration and harshness (NVH) testing and the vibroacoustic source prediction, is acquired using transfer paths concept [1,2,3,4,5]
Because of noise and crosstalk, the traditional operational transfer path analysis (OTPA) presents consequent errors in response synthesis evaluation and misjudgments in the transfer function determination. erefore, crosstalk cancellation and improving the accuracy of OTPA prove to be of great research significance, which can benefit vibration and noise monitoring, reduction and control through vibration reduction structure design, or vibration damping on the major vibration transfer paths
Comparing the results of these two methods, it is observable that the proposed OTPA is in average 4.15% more accurate than the traditional OTPA method, which is due to the noise elimination from the study as well as the crosstalk cancellation
Summary
The demand for comfortable, silent, and stealthy technologies has extensively grown. e knowledge of transmission and distribution of vibration and noise signals, being the major concern while dealing with noise and vibration and harshness (NVH) testing and the vibroacoustic source prediction, is acquired using transfer paths concept [1,2,3,4,5]. E knowledge of transmission and distribution of vibration and noise signals, being the major concern while dealing with noise and vibration and harshness (NVH) testing and the vibroacoustic source prediction, is acquired using transfer paths concept [1,2,3,4,5]. In this prospect, vibration and noise reduction techniques for cars, heavy duty vehicles, and high-speed trains are shinning research hotspot [6, 7]. Because of noise and crosstalk, the traditional OTPA presents consequent errors in response synthesis evaluation and misjudgments in the transfer function determination.
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