| Amphibious vehicles are widely used in the military and civilian sectors because of their special properties as both vehicles and boats.The study of wheel retraction technology for amphibious vehicles is a key factor in improving the speed of the vehicles.In this paper,the front suspension of a new energy amphibious vehicle is designed and a hydraulically powered retractable front suspension is proposed.The strength and vibration performance of the control arm in this front suspension structure is analysed to ensure the strength of the control arm components on the basis of the lightweight design of the control arm to meet the requirements of amphibious use.This paper firstly introduces the research status in the field of amphibious vehicles at home and abroad.Based on the space layout of this amphibious vehicle and the requirements for wheel lift,a structure of retractable front suspension is designed.Through the analysis of the movement relationship between the parts of the mechanism,the geometric dimensional design of the parts is completed;based on 3D modelling software to create the model of the retractable front suspension assembly,and complete the static and dynamic interference check and processing of the assembly;according to the relevant hydraulic system principles,calculate the maximum pressure calculation of the system and the main dimensions of the hydraulic cylinder,draw the schematic diagram of the hydraulic retractable device,and complete the hydraulic retractable device The design is carried out.Then,each extreme operating condition is selected and the loads at the 3 connection locations of the control arm(outer ball joint point,inner bushing front point and inner bushing rear point)are extracted based on ADAMS software.;and this load was used as the boundary condition for the finite element simulation analysis,and the finite element model was established by ANSA,and the static strength was solved in ABAQUS based on the inertia release method.The stress and displacement clouds under each limit condition were obtained.At the same time,numerical modal analysis of the control arm model and experimental verification revealed that the inherent frequency of the control arm is far from the range of external excitation frequencies to which the amphibious vehicle may be subjected,and basically does not produce resonance phenomena.Finally,based on the lightweight design requirements,the topology of the control arm model of the retractable front suspension is optimised through structural optimisation methods,and the control arm model is modified according to the optimisation results. |
