Design And Analysis Of Key Mechanism Of The Large Array Vehicle Borne Radar Driven By Telescopic Arm

The maneuverability of large array vehicle borne radar plays an important role in modern war.In order to greatly improve the comprehensive performance of vehicle borne radar and avoid the intermediate link of antenna array block transportation and docking assembly,in the case of ensuring a large array,this paper proposes a kind of radar device which only relies on single vehicle transportation and realizes the folding and unfolding of large antenna array by driving the telescopic arm.This paper presents the overall structure scheme of the vehicle borne radar with large deployable array based on the drive of the telescopic arm,and designs the principle and structure of the deployable device and the erecting device in detail.The force of the telescopic arm is analyzed,and the rigidity and strength are checked.The finite element model of the expansion device and the extension arm is established by using ANSYS Workbench,and the stress and deformation of the structure under the action of the ultimate wind load are obtained,which proves that the static characteristics of the structure can meet the requirements of the design index.The first six modes and frequencies are obtained by the finite element analysis of the mode of the deployment device,which provides the basis for the resonance between the monitoring radar system and the external equipment.The dynamic model of the flexible multi-body system of the flexible folding and unfolding mechanism of the reflection net is established,the dynamic equation of the flexible element of the reflection net is derived,and the group of the elements is completed through the constraint equation,and the dynamic equation group of the flexible folding and unfolding mechanism system is obtained.Based on the generalized method,the program for solving the dynamic equation of the system is derived,and the unfolding and retracting conditions of the unfolding and retracting mechanism of the reflection network are analyzed,and the dynamic parameters of the unfolding and retracting process of the reflection network are obtained.This paper analyzes the abnormal bending and self-locking conditions that may occur during the operation and withdrawal of the reflection net,and concludes that the bending and self-locking problems of the reflection net can be solved by controlling the angle between the reflection net or adding torsion spring at the hinge point,so as to ensure that the folding and unfolding mechanism of the reflection net can work normally under different working conditions.The kinematic model of the erecting mechanism is established,the explicit expressions of the displacement,velocity and acceleration of the erecting cylinder and the hinge point coordinates of the bearing rod when the mechanism is at the dead point are derived,the lifting speed of the antenna array is optimized,the reasonable lifting scheme is obtained,and the vibration and impact on the antenna array are reduced.The dynamic model of running limit collision between the vertical rods is established.The driving force of the vertical cylinder,the collision force between the bearing rods,the reaction force of the base at the bottom and the vibration characteristics of the antenna array are obtained through ADAMS simulation analysis,which verifies the stability and safety of the mechanism in the process of erecting.The movement function test and mechanical performance test of the prototype are carried out,which verify that all the movement functions of the mechanism and the mechanical performance of the telescopic arm meet the requirements of the design index,and prove the feasibility and superiority of the structural design scheme of the extendable large array radar driven by the telescopic arm.In this paper,the new scheme of large array radar structure and the design and calculation method of key mechanism derived can provide the basis for the design and manufacture of this kind of products.