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Acta Armamentarii ›› 2022, Vol. 43 ›› Issue (8): 1753-1762.doi: 10.12382/bgxb.2021.0449

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Vibration Characteristics and Improved Design of Intake-Cooling Pipes for Heavy Duty Vehicles

LIU Yuhang1, LIU Xin2, ZHANG Sheng1, LI Hongbiao1   

  1. (1.Beijing Institute of Space Launch Technology, Beijing 100076, China; 2.School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300401, China)
  • Online:2022-07-29

Abstract: The intake system of a heavy duty vehicle consists of intake-cooling iron pipes on both sides and an intercooler. After delivery to user, cracks are often found on the left cooling pipe, whereas the right pipe is in good condition. Vibration tests of the intake system are conducted to find out the reasons for the failure. In-situ and running vibration acceleration data are collected. Through data analysis, it is found that resonance occurs to the left intake pipe under in-situ condition or when the engine is operating at 1 700 r/min. The right intake pipe bears greater excitation acceleration than the left one. Both sides of the intake pipes share similar dominant frequencies between 0-200 Hz. According to the frequency response simulation of the left intake pipe, the resonance frequency occurs at 138 Hz and the maximum stress at the bottom of the pipe is 74.2 MPa. The structure of the left intake pipe is developed by comparing the left and right intake pipes’ parameters. Both simulation and vibration tests are conducted on the improved intake pipe. The results show that the improved pipe successfully avoids the main excitation frequency and the vibration conditions are also improved under different road conditions.

Key words: intake-coolingpipes, vibration, experiment, frequencyresponsesimulation

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