| 摘要 |
PROBLEM TO BE SOLVED: To easily and accurately estimate the noise of a gear device where real condition of the noise can hardly be grasped by focusing attention on the under floor noise as a traveling noise of a railway rolling stock. SOLUTION: An actual measurement valueαof the noise in the vicinity of under floor of a truck of M vehicle, and the actual measurement valueβof the noise in the vicinity of under floor of the truck of T vehicle are obtained from the travel test of the M vehicle and T vehicle, and the noiseδof the drive system is obtained based on the actual measurement valueαandβ. In a high speed area where aerodynamic sound is dominant as the noise of a main motor 1, the actual measurement valueγof the main motor noise obtained from a stationary test of the main motor 1 is corrected based on the difference between the measurement condition of the travel test and the measurement condition of the stationary test. The estimation valueεof the gear device body is obtained from the difference between the correction value of the actual measurement valueγand the noiseδof the stationary test. COPYRIGHT: (C)2007,JPO&INPIT
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