关键词: 偏频；平衡悬架；八自由度模型；解析计算模型

Abstract: As the core design parameter of the suspension system, suspension partial frequency directly determines the vibration transmission characteristics during vehicle operation and has a crucial impact on vehicle performance such as vibration. Its design rationality is directly related to riding comfort, component reliability, etc. Aiming at the structural characteristics of commercial vehicles with balanced suspension, this paper identifies key components such as axles, suspension systems, frames, cabs and mounting systems, clarifies the connection relationship and mechanical characteristics of each component, and on this basis, establishes a vehicle 8-degree-of-freedom vibration system model, which provides a reliable simulation basis for the design of suspension partial frequency. In the design process, based on the actual design parameters of the vehicle, the system modal shape analysis is correlated with the spring stiffness parameters to automatically identify the suspension partial frequency. The vibration model established in this paper can ensure that reliable partial frequency results can be obtained quickly and effectively without prototypes in the early stage of design. It not only provides accurate simulation model support for the design of suspension partial frequency, but also can predict the impact of partial frequency design on vehicle vibration in advance, thus providing a basis for subsequent performance design.

Key words: partial frequency; balanced suspension; 8-degree-of-freedom model; analytic computational model