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Inspired by Beijing Subway wheel-rail truck interior noise calculation and contribution analysis

Author: WuYing
Tutor: LiangXiFeng；LuoBin
School: Central South University
Course: Vehicle Operation Engineering
Keywords: Beijing subway train Wheel-rail excitation Modal Analysis Interior noise Acoustic contribution
CLC: U270.16
Type: Master's thesis
Year: 2007
Downloads: 178
Quote: 2
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Abstract


Excessive noise will seriously affect the passenger's psychological, physiological, and normal life, controlling noise pollution is to achieve sustainable and coordinated development subway train an inevitable requirement. Papers to control wheel-rail excitation interior noise as the target, wheel-rail noise excitation conducted in-depth research. Through the body, frame, wheel modeled as multi-body systems, rail processed into discrete intervals by the finite infinitely long sleepers supported Timoshenko beam, the establishment of the first subway car - orbit coupling dynamics model to wheel and rail irregularities as Excitation spectrum of the vibration response of the vehicle is calculated to obtain the two series air spring contact with body in three-dimensional space of the vibration loads, the results showed that: track irregularity in the vertical and lateral loads caused by large amplitude excitation , and in the longitudinal direction caused by the load amplitude less incentive. Finite element method for Beijing Subway trucks for modal analysis to calculate the natural frequency of the first car and mode shapes. The results show that: the first car modes are mostly located in the tail end of the wall, near the floor at the rear, bottom middle, so that these parts become the main source of interior noise. To ensure that the first vehicle with the expected fatigue life and a good ride comfort, should be in the design, manufacture strengthen the tail end wall, close to the rear plate and the bottom plate at the middle of the rigidity to improve the fatigue life, reduce interior noise. Integrated application of finite element and boundary element methods to track irregularities caused by the load conditions as an incentive to calculate the vibration response of the car, as well as body panels on the vibration exciting force its radiated noise, obtained the passenger compartment, the driver room sound field distribution, analyzes the passenger compartment, the driver interior noise distribution characteristics, the results show: the rear of the passenger compartment in front of the big-noise ratio, close to noise ratio at the sidewall near the centerline large; located near the side wall of the passenger compartment A prediction point rear of the maximum sound level, which is 65.2 dBA; in the rear of the cab, the predicted point near the centerline A maximum sound level, it is 75.5dBA. Discusses the contribution of the acoustic characteristics and according to the contribution of noise control strategy, calculation of the Beijing subway truck cab and passenger compartment contribution of each unit, the structure showed that: the acoustic unit at a point inside the acoustic contribution not only to the cell vibration amplitude, but also on the vibration phase, and the unit. Entry plate 3 in the car, the driver compartment floor chamber end wall 4 and the structural modification or coating slurry damping to suppress those parts of the vibration of the cab can be reduced, the noise in the passenger room.

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CLC: > Transportation > Rail transport > Vehicle Engineering > General issues > Vehicle theory and experiment > Vehicle noise and to prevent
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