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Aiming at the low-frequency vibration in the Y direction of a heavy commercial vehicle cab during heavy climbing, this paper analyzes the causes, makes the optimization measures and verifies by test. Through the spectrum analysis and order tracking of the vibration inside the car, it is identified that the frequency range of the low-frequency vibration problem is fixed at 7.0–10.0 Hz, and the excitation source is from the second-order force of the drive shaft, which is caused by the space angle of the drive shaft. Through the test and analysis of vibration transmission path and mode, the yaw rigid body mode of the powertrain, and the Y-direction rigid body mode of the cab assembly are identified to form a secondary resonance with the problem frequency. The improvement direction of excitation source optimization and mode frequency avoidance is developed. The series optimization schemes such as engine mounting stiffness are verified under current production conditions, and the vibration attenuation is more than 50% and acceptable. In the subsequent product upgrade, the focus is on the angle of the drive shaft and mode distribution to improve the vibration comfort of commercial vehicles.

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Analysis of Low-Frequency Vibration Issues on a Heavy Commercial Vehicle Under Climbing Condition

  • 会议论文

  • 发表日期：

    2026年

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  • Hailong Cheng,
  • Qinglin Xu,
  • Liang Wang,
  • Libin Zhou,
  • Xiong Ye,
  • Chuanshuai Fan,
  • Kai Jia,
  • Lingzhi Li,
  • Xiangrui Kong,
  • Chuanfu Dong,
  • Zhuo Ding,
  • Pengwei Mu,
  • Ming Zhang,
  • Liang Hong,
  • Xudong Wang,
  • Qingyuan Chi

摘要

Aiming at the low-frequency vibration in the Y direction of a heavy commercial vehicle cab during heavy climbing, this paper analyzes the causes, makes the optimization measures and verifies by test. Through the spectrum analysis and order tracking of the vibration inside the car, it is identified that the frequency range of the low-frequency vibration problem is fixed at 7.0–10.0 Hz, and the excitation source is from the second-order force of the drive shaft, which is caused by the space angle of the drive shaft. Through the test and analysis of vibration transmission path and mode, the yaw rigid body mode of the powertrain, and the Y-direction rigid body mode of the cab assembly are identified to form a secondary resonance with the problem frequency. The improvement direction of excitation source optimization and mode frequency avoidance is developed. The series optimization schemes such as engine mounting stiffness are verified under current production conditions, and the vibration attenuation is more than 50% and acceptable. In the subsequent product upgrade, the focus is on the angle of the drive shaft and mode distribution to improve the vibration comfort of commercial vehicles.