Acoustic vibration equivalent modeling method for rail vehicle body aluminum profile structure

Abstract

The invention discloses an acoustic vibration equivalent modeling method for an aluminum profile structure of a railway vehicle body. The method comprises the following steps: S1, establishing a finite element model of the aluminum profile structure; S2, calculating an elastic modulus Ex and a Poisson's ratio vx; S3, calculating an elastic modulus Ey; S4, calculating a shear modulus Gxy; S5, calculating a shear modulus Gxz; S6, calculating a shear modulus Gyz; S7, calculating the equivalent density rho eq; and S8, establishing an acoustic vibration equivalent model; according to the modeling method, the acoustic vibration characteristics of the aluminum profile of the railway vehicle body can be rapidly and accurately simulated, the sound reduction index rules of the finite element model and the acoustic vibration equivalent model at 100-3150 Hz are consistent, the average error is only 1.6 dB, and compared with the finite element model, the acoustic vibration equivalent model can shorten the calculation time by 90%; therefore, the acoustic vibration performance research efficiency of the aluminum profile of the railway vehicle body is improved.

Description

technical field [0001] The invention relates to the field of profile technology, in particular to an acoustic-vibration equivalent modeling method for an aluminum profile structure of a rail vehicle body. Background technique [0002] Rail transit is the lifeblood of my country's national economy, and its core technologies are safety, comfort, greenness and intelligence, among which noise and vibration (acoustic vibration) are crucial to safety, comfort and greenness. Aluminum alloy extruded profiles (aluminum profiles) are the main body structure of rail vehicles, and the study of the acoustic-vibration properties of aluminum profiles is critical to controlling the internal noise of rail vehicles. For complex structures such as aluminum profiles, finite element model calculations can reflect the acoustic-vibration characteristics of the actual structure, but when the calculation frequency increases, it is difficult to balance the relationship between the number of grids, ca...

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Problems solved by technology

For complex structures such as aluminum profiles, the calculation of the finite element model can reflect the acoustic and vibration characteristics of the actual structure, but when the calculation frequency increases, it is difficult to balance the relationship between the number of grids, calculation frequency, and calculation time. Generally, it is only suitable for low-frequency calculations of small-sized structures. However, the aluminum profiles of rail transit cars have large structures, complex cross-sectional shapes, and wide acoustic-vibration frequencies. Direct calculations using the finite element method are not only very complicated to model, but also consume a lot of time. , it is not even possible to calculate

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