Analysis On The Frame Structure Of Multi - Axle Heavy - Duty Off - Road Vehicle

This paper is based on multi-axis heavy-duty off-road vehicles as the investigated subject, and focus on the analysis of the static and dynamic characteristics of the frame and comfort of the vehicle.Mesh the frame structure by using HyperMesh software, and import the frame finite element to ANS YS software, after assembly connection, establish the finite element model of frame structure based on shell element. By using ANSYS spring damper element, rigid element, hinge element and multi-point coupling technology, establish a reasonable finite element model of the double torsion bar double wishbone suspension, which is used in finite element analysis of the vehicle.Static analysis with finite element method is performed to frame respectively in full bend, full reverse, full of turns and full braking four kinds of conditions, and through the results of stress distribution and displacement distribution of the frame under four conditions, know that the frame meet the design requirements. And the reverse condition should be the focus of the frame strength and stiffness checking object.Carrying out finite element modality analysis on the established model, and obtained the mode paraments of the frame, satisfy the dynamic characteristic of frame conditions. On the basis of modal analysis, the paper analyzes the sensitivity of the frame and does lightweight optimization design and modal optimization design of the frame, which has a guiding significance and reference value to further improve the dynamic characteristic of frame.By using the filter white noise method establish the random road four-wheel excitation time domain state space equation. Establish a half off 11 degrees of freedom vehicle plane system vibration model and deduce the frequency response function and the state space equation of the system. By using MATLAB to the simulation calculation, we can obtain the frequency domain character and time domain character of all vibration responses, which provides a theoretic basis to further improve the ride comfort of the multi-axis heavy-duty off-road vehicles.