A method for constructing an equivalent reduced model of a train and an equivalent reduced model of a train

Abstract

Disclosed are a method for constructing an equivalent scaled-down train model and a device for acquiring an equivalent scaled-down train. The method comprises: acquiring a scale factor of each dynamic parameter of an equivalent scaled-down train model with respect to a full-sized train; dividing the train into a front carriage and a middle carriage according to deformation and energy absorption features during a train collision, and dividing the front carriage into a deformed energy-absorbing region and a non-deformed region; respectively constructing a front carriage and a middle carriage of the equivalent scaled-down train model on the basis of the scale factor of the dynamic parameters; constructing an energy absorption guide member between adjacent carriages of the equivalent scaled-down train model according to deformation and energy absorption characteristics of a carriage-connecting mechanism disposed between adjacent carriages of the full-sized train, and calculating the length of an aluminum honeycomb-like cylinder on the basis of a dimensions scale factor; and calculating a cross-sectional area of the energy absorption guide member according to structural dimensions and a deformation and energy absorption characteristic curve of the carriage-connecting mechanism. The scaled-down front carriage model constructed by means of present the invention is highly reliable and ensures that the impact force of a train is similar to the rigidity of a train carriage, while also accurately reconstructing a train collision process.

Description

technical field [0001] The invention belongs to the technical field of vehicles, and in particular relates to a method for constructing an equivalent reduced model of a train and an equivalent reduced model of a train. Background technique [0002] The heavy casualties caused by the train collision accident are shocking. Different from single-body collisions of vehicles, ships, etc., trains are composed of multi-section vehicles, with high mass and high speed, and the impact kinetic energy is much higher than that of automobile collisions. During the train collision process, there are not only the impact damage of a single car, but also the coupling and mutual collision between vehicles. Due to the coupling effect between vehicles during collision, the evolution process of collision behavior is complex and changeable. It is difficult to accurately simulate the complex dynamic response of the nonlinear system composed of train-line-operating environment by using numerical ca...

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Problems solved by technology

However, the scaled car body is made of a mass block whose strength is higher than that of the energy-absorbing structure, resulting in a change in the center of gravity of the train and an excessive mass of the scaled car body, making it difficult to meet the scaling criteria; and the mass block car body is thinner than the original car body The wall structure increases the rigidity of the train, and the internal structure of the scaled car body is quite different from the actual train, which cannot guarantee the similarity of the car body stiffness, which will easily lead to inconsistent dynamic response laws of the car body, and it is difficult to accurately simulate the dynamic response of the train collision and cannot be truly restored The collision process of the train; in addition, the similarity of the appearance of the car body is not considered, the appearance of the scaled car body is quite different from the original car body, and the obtained reduced model needs to be further improved

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