Method for estimating aerodynamic force of motor train unit

Abstract

The present invention discloses a method for estimating an aerodynamic force of a motor train unit. The method comprises: setting a plurality of pressure measurement points on a carriage; measuring a pressure of each pressure measurement point; obtaining carriage surface pressure distribution by using a radial basis function interpolation method; and then obtaining an aerodynamic differential pressure force of the carriage by adopting a numerical integration method. The present invention can be used for a track test and a dynamic model test of the motor train unit. Due to adoption of the radial basis function interpolation technology, the carriage surface pressure distribution can be obtained quickly according to a small number of pressure measurement points and accuracy of estimating the aerodynamic force is improved. Moreover, surface friction and the aerodynamic force of a key component are introduced for correction, so that estimation accuracy is further enhanced.

Description

technical field [0001] The invention relates to an estimating method, in particular to an estimating method for the aerodynamic force of an EMU. Background technique [0002] The research methods of high-speed train aerodynamics mainly include line test, wind tunnel test, dynamic model test and numerical calculation method, and the research content mainly focuses on the pressure on the surface of the car body and the aerodynamic force on the train. Compared with the wind tunnel test method, the line test and the dynamic model test can better reflect the real flow field around the train. When these two test methods are used to study the aerodynamics of the train, the pressure on the surface of the car body can be directly measured by the sensor. The test data is obtained by measurement, but the aerodynamic force on the train is difficult to measure directly. The dynamic model test can solve this problem by designing a mobile balance, but the design of the mobile balance is te...

AI Technical Summary

Problems solved by technology

Compared with the wind tunnel test method, the line test and the dynamic model test can better reflect the real flow field around the train. When these two test methods are used to study the aerodynamics of the train, the pressure on the surface of the car body can be directly measured by the sensor. It is difficult to directly measure the aerodynamic force on the train. The dynamic model test can solve this problem by designing a mobile balance. However, the design of the mobile balance is technically difficult and expensive. Test technology; for line tests, it is difficult to directly measure the six-component aerodynamic force on the train with the current technology

[0003] So far, the widely used aerodynamic estimation methods mainly include Newtonian flow model, tangential cone method, Dahlem-Buck method, etc., but these methods are mainly used in the aerospace field. number, unsteady flow field, it is difficult to directly learn from the existing aerodynamic estimation methods

[0004] The existing aerodynamic test calculation method is to directly calculate the aerodynamic force on the train based on the pressure measuring points. When the number of pressure measuring points is small, it is difficult to obtain accurate test results

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