Design And Analysis Of Lightweight Tracking Mechanism

In this paper,based on a lightweight cable net reflector,a 3RPS parallel mechanism is applied on its tracking mechanism,and a lightweight solar tracking system is designed,which is expected to be applied in sunlight convergence in practice.This tracking system mainly includes a cable net reflector,a tracking mechanism and a truss support structure.This paper focuses on the structural design and analysis of the whole tracking system,and the entire flow of the tracking system is designed,finally,physical verification of the tracking system is performed.Firstly,the theoretical calculation of the sun position is carried out and the calculation accuracy is tested.The sun's motion law and two coordinate systems used to determine the position of the sun are introduced briefly,based on this,the position of the sun is calculated.Referring to the 2015 Chinese astronomical calendars,the most accurate one is selected among several astronomical algorithms.Finally,the date calculated by the astronomical algorithm of this paper is compared with the date of the Era Shuttle Calendar,the accuracy of the sun's height angel and azimuth angel calculated in this paper is within 0.05°.Secondly,the tracking mechanism is selected and analyzed.According to the characteristics of the lightweight cable net reflector,the 3RPS is applied to the tracking mechanism,and the posture of the 3RPS is analyzed.The formula of the rod length is obtained and the calculation method of the rod length is improved.The dimensions of the tracking platform and the structure of the composite spherical hinge are compared and selected.Finally,the motion simulation of the tracking mechanism is performed by using ADAMS software.Then,the structure of the tracking system is designed and analyzed.The wind load calculation formula is deduced,and static analysis models of the reflector in typical working conditions are built up.The optimization of multi-objective and multi-working conditions of the reflector is optimized by using ANSYS and ISIGHT software.The structural dimensions of the extended poles and trusses are analyzed and designed.The overall model is built up by the coupling of the degrees of freedom of the joints.The overall model is subjected to static analysis under multi-working conditions and optimization of multi-objective and multi-working conditions.The static analysis of the whole model under the condition of facing the sky is carried out.Finally,it is concluded that the overall model can work normally under the three-level wind and is not destroyed under the six-level wind conditions.Finally,the control system is designed and analyzed.Various hardwares required for the tracking system are selected and analyzed,and the connection of each hardware is described.The whole flow of the solar tracking system is designed,and the process is explained in detail,the whole tracking system program is written.Finally,an overall physical model of the tracking system is produced,experimental verification is conducted,and the tracking accuracy of the system is within 0.4°.The analysis of this paper will have certain significance for the future application of cable net reflectors in solar energy projects.