Modeling and Analysis of Multi-level Coupling Dynamics of Tracked Vehicle Based on Load Transfer Path

doi:10.3901/JME.2023.13.157

Abstract

Abstract: Tracked vehicle is composed of vehicle body, action system, power unit, etc., with task loads such as weapon system or operation equipment installed on the top. It is an important form of land-based mobile platform in the field of national defense and special industry. Under the combined action of power plant excitation and road roughness excitation, the coupling dynamic characteristics of multi-layer products of tracked vehicles are very complex, and the load transfer path has a significant impact on the dynamic stability of task load. Carrying out relevant research has great theoretical significance and engineering value. Taking a heavy tracked vehicle as the object, a modular multi-level coupling dynamic model is established according to the load transfer relationship between vehicle body, power device, load wheel and track; Based on the vibration transmission mechanism of "excitation source transmission path target point response", the load transmission characteristics of real vehicle under two excitation sources of power plant and road are tested to verify the effectiveness of multi-level coupling dynamic model; Using the verified dynamic model, the response spectrum of each degree of freedom of the vehicle body and the distribution law of modal kinetic energy of the whole vehicle under typical load excitation are calculated and obtained; The effects of structural lightweight, driving speed and track pretension on the dynamic stability of mission load are further discussed. The results show that the multi-level coupling dynamic model based on load transfer path can effectively characterize the vibration transmission mechanism of vehicle body under multi-source excitation. When the test conditions are limited, it can provide basic theoretical basis and efficient analysis method for structural design, dynamic optimization and vibration control of tracked vehicle, and can be extended to fault diagnosis and excitation source location of tracked vehicle.

Key words: load transfer path, dynamic model, modal characteristics, lightweight

CLC Number:

TH113

LI Chunming, BAO Ke. Modeling and Analysis of Multi-level Coupling Dynamics of Tracked Vehicle Based on Load Transfer Path[J]. Journal of Mechanical Engineering, 2023, 59(13): 157-174.

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