| Vehicle-mounted automatic retrievable antenna equipment is characterized by fast erection and retrieval,strong transport and transfer capability,which can effectively improve the mobile operation capability and survival rate of the antenna equipment in the war,meet the needs of modern war,and is increasingly valued and favored by the military.This thesis takes the research and development of auto-retrievable logarithmic periodic antenna as the background,carries out simulation analysis and test research around antenna structure design,working wind load,road surface vibration when maneuvering,etc.The research results can provide technical support for the design and development of prototype structure of retrievable antenna.Specific contents are as follows: Firstly,based on the principle of scissor-type lifting platform in engineering structure,the design of antenna deployment and closing mechanism of scissor-type hinge is proposed.The antenna structure is attached to the lifting rod of the front support,and unfolds and closes with the lifting rod of the support rod.Three antenna structure schemes are formed.Secondly,the extreme static wind loads acting on the antenna structure are calculated according to the shape of the antenna structure and the wind speed in the possible working area,and the static deformation simulation analysis under static wind load is carried out for the three deployment schemes of the antenna by using ABAQUS finite element software,and the simulation static wind load experiment verification is carried out.Then,the frequency domain method is used to study the fluctuating wind vibration response of the deployed antenna structure.Firstly,the research of antenna structure’s natural frequency and mode shape vibration characteristics in equal frequency domain is carried out and verified by mode experiment.According to the power spectrum of Davenport pulsating wind speed and different wind speeds in different regions,the power spectrum of pulsating wind speed in typical regions is obtained to study the vibration response law of antenna structure under random wind load.Finally,the random vibration response of the antenna structure during road transportation under the closed state is studied.Based on the current standard random excitation spectra of road transportation and the measured vibration data of sports car test,the mathematical model of vertical excitation spectra considering road surface roughness and driving speed is established,and the random vibration response analysis of road transportation with antenna structure at different pavement levels and speeds is carried out. |
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