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WANG Qian-xuan, HU Zhe-long, LIANG Xi-feng, HUANG Zun-di. Relationship among internal pressure, body air tightness and external pressure of rail vehicle[J]. Journal of Traffic and Transportation Engineering, 2018, 18(4): 103-111. doi: 10.19818/j.cnki.1671-1637.2018.04.011
Citation: WANG Qian-xuan, HU Zhe-long, LIANG Xi-feng, HUANG Zun-di. Relationship among internal pressure, body air tightness and external pressure of rail vehicle[J]. Journal of Traffic and Transportation Engineering, 2018, 18(4): 103-111. doi: 10.19818/j.cnki.1671-1637.2018.04.011
shu

Relationship among internal pressure, body air tightness and external pressure of rail vehicle

doi: 10.19818/j.cnki.1671-1637.2018.04.011
  • 1.

    School of Traffic and Transportation Engineering, Central South University, Changsha 410075, Hunan, China

  • 2.

    School of Railway Tracks and Transportation, Wuyi University, Jiangmen 529020, Guangdong, China

  • 3.

    KTK Group Co., Ltd.., Changzhou 213102, Jiangsu, China

More Information
  • Author Bio:

    WANG Qian-xuan(1982-), male, lecturer, PhD, wqxzndx@163.com

    HU Zhe-long(1983-), male, engineer, master, 93624839f@qq.com

  • Received Date: 2018-01-28
  • Publish Date: 2018-08-25
    Abstract
  • The evaluation index system of the air tightness of a rail vehicle body was researched by using the theoretical analysis, numerical calculation, and model test. The air tightness of a vehicle body was expressed by the pressure relief time or equivalent pressure relief hole area. The law of external transient pressure transferring to the inside of the vehicle body was given, and the theoretical relation between the internal pressure and the air flow in and out of the vehicle body was obtained. Based on the large-stiffness vehicle body model, the relationships among the internal pressure, air tightness, and external pressure of vehicle body were researched. A largestiffness vehicle body model with a pressure relief hole was designed, and the relationalexpression between the pressure relief hole radius and pressure relief time was obtained. The five kinds of large-stiffness vehicle body models with five different pressure relief times were used for a test in the closed chamber of the alternating-pressure simulation test bench, and the test data were analyzed. Analysis result shows that the internal pressure of the vehicle body changes linearly with time when the volumetric flow rates of the air inlet and outlet are constant. When the flow rates of the air inlet and outlet are the function of time, the change of internal pressure is the integral of the flows of air inlet and outlet about time. The absolute errors of tested and calculated pressure relief times of the vehicle body models with different pressure relief hole radii are less than 6.5%, which shows that the relationship between the pressure relief time and the pressure relief hole radius obtained by the numerical calculation is basically correct. The relationship between the vehicle body air tightness and internal pressure change rate is a power function, and the internal pressure change rate and external pressure amplitude are linear. The relationship among the internal pressure, vehicle body air tightness, and external pressure of the large-stiffness body model is obtained, and it can provide theoretical support for the formulation of a scientific and reasonable air tightness index of the vehicle body.

     

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