Structural Design And Strength Analysis Of Functional Components Of An Anti-hijacking Vehicle

Audio beam and flash synergistic disperse vehicle,as a soft destructional special vehicles,is used for an terrorists and dispersing the crowds by emitting strong sound which could make people feel harsh and bright light that makes human eye uncomfortable.This vehicle includes the acousto-optic synergy dispersing and monitoring system,the breaking and impacting push shovel,armor protection body and the elevating platform,hydraulic and electric control system,etc.According to the design requirements of the anti-hijacking vehicle,structural design and strength analysis of these functional components,(the push shovel,armor protection body and the elevating platform),have been performed in the current study.With the design duiding and principle of the anti-hijacking vehicle,the overall technical parameters and the overall packaging were determined.On the basis of the centroid estimation,the rollover failure analysis of the anti-hijacking vehicle was performed and the results show that the structure packaging of the anti-hijacking vehicle is reasonable and the highly stable.Based on the design requirements,the design parameters of the breaking and impacting push shovel,armor protection body and the elevating platform respectively were determined.The 3D models of the breaking and impacting push shovel,armor protection body and the elevating platform were built and the assembly work was completed with Creo software.The dynamic simulation analysis of the push shovel were conducted by using ADAMS/View module,the maximum hinge point force of the push shovel cylinder was decided at the dangerous moment.Then statics analysis of the lower arm was carried out under the condition of maximum force.The results show that the strength of the breaking and impacting push shovel could meet the requirements.The FE model of the anti-hijacking vehicle body frame was established,the free modal analysis was carried out with Lanczo method and the top six order natural frequency and vibration model was extracted in HyperWorks/Opti Struct.The results indicate that the natural frequency can prevent the external excitation vibration source and resonance.Besides,the simplified model of bullet penetration into armor plate was established by using software Hyper Works/Ls-Dyna,the Johnson-cook material model was adopted to simulate the bulletproof steel,the kinematics simulation was performed and the accuracy of the model was verified against experimental data.Accordingto the protection grade requirements,the simulations of bullet penetration into armor plates of different thicknesses were performed,the final design thickness of steel plate was decided to be 4mm,and certain theoretical basis was provided for the design of armor protection body.Based on the principle of virtual work and knowledge of structural mechanics,mechanics analysis of the elevating platform was carried out,the co-simulation simulation was performed by using ADAMS and AMESim software,and the oil cylinder lifting force curve of the scissor elevating platform was obtained.In order to improve the stability of the elevating platform,sensitivity analysis was done to determine the design variables and the cylinder hinge point location optimization was performed by the OPT-DES-SQP algorithm,which takes the maximum force and pressure as the target in ADAMS.After those optimization work,the statics analysis of the fork arms was performed.The results show that the stress could meet the strength requirements and the design of the elevating platform is reasonable and reliable.The 2D drawings of the push shovel,armor protection body and the elevating platform were completed with Creo and CAD.Prototyping test and the general assembly were conducted to complete the prototype test of the anti-hijacking vehicle,which lays the foundation for further study.