Method and apparatus for acquiring noise excitation load in railway carriage

Abstract

The invention relates to a method for acquiring a noise excitation load in a railroad passenger car and a device thereof; the method of the invention is to collect transverse, vertical and longitudinal vibration signals at a contact point of a steering frame of the railroad passenger car and a secondary suspension by utilizing a characteristic that the vibration at the contact point of the steering frame of the railroad passenger car and the secondary suspension is basically consistent with the vibration near a contact point on the side beam, and to calculate the vibration at the a contact point of the secondary suspension and a carriage by the frequency response function of the secondary suspension. The method and the device are simple and precise, have easy operation, reduce the design cost, are capable of carrying out a harmonic vibration analysis on the carriage and obtain the vibrating situation of wall panels of the carriage, thereby providing source data for the precise calculation of the in-car noise and evidence for the effective measures taken to reduce noise. In order to ensure that the passenger car can stall measure the vibration signal when moving at a high speed, a magnetic base structure is adopted, and the collection of the vibration signal can be finished by simply adsorbing a magnetic base on the side beam of the steering frame, thus having simple structure, convenient installation and easy adjustment.

Description

technical field [0001] The invention relates to a noise control method and device for railway vehicles, in particular to a method for acquiring noise excitation load inside a railway passenger vehicle and the device used, belonging to the field of noise control for railway vehicles. Background technique [0002] In order to ensure the comfort of railway passenger cars, strict control indicators have been put forward for the noise inside the railway passenger cars. However, the lack of effective noise information feedback in the design process of railway passenger cars makes the noise control of railway passenger cars very blind. The noise control plan adopted is only based on experience and lacks scientific basis. In order to keep the noise of railway passenger cars from exceeding the standard, railway passenger car manufacturers often take various conservative and passive measures to reduce noise, which will inevitably increase the cost of railway passenger car noise contro...

AI Technical Summary

Problems solved by technology

Establish a multi-body dynamic model of car body, bogie, wheel-rail, sleeper, and ballast bed, and use multi-body dynamics software for simulation to calculate the vibration of the contact point. However, when performing multi-body dynamics simulation, the track roughness The degree spectrum is used as the excitation condition, but there is no track roughness spectrum in China at present. Therefore, it is imperative to obtain the lateral, vertical and longitudinal vibrations of the contact point through vibration testing.

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