Dynamic Characteristic Analysis Of Solar Panel Based On Absolute Nodal Coordinate Formulation

The dynamic characteristics of solar panels under fluctuating wind and solar radiation has been a hot research topic in the field of photovoltaic power generation.In this paper,based on absolute node coordinate formulation(ANCF),the dynamic characteristics of solar panels are analyzed.The characteristics of solar panel under thermal load were studied by combining heat conduction equation with absolute node coordinate method.Through the above analysis,it provides theoretical basis for the design of installation structure of solar panels,and provides certain reference value for solving the stress and heat analysis of similar structures.The main work includes:(1)Based on Kirchhoff plate theory and continuum dynamics,the shape function of rectangular element and its displacement field array under absolute node coordinate method are derived in detail.On this basis,the solar panel is discretized and the generalized mass matrix,the generalized elastic force matrix and the generalized external force matrix of the solar panel are further established.Finally,the non-linear dynamic differential equation of the system is derived on the basis of Hamilton principle.(2)The effects of near-ground fluctuating wind frequency,wind direction,wind force and fixing mode on the dynamic characteristics of solar panel were studied.The natural frequency and vibration mode of solar panel are analyzed based on ANCF dynamic equation,and the results are compared with NX simulation results.The results show that the dynamic equation can effectively analyze the inherent characteristics of solar panel.By comparing the general motion law of the near-ground ripple component,it can be shown that the frequency of the ripple wind can not cause the resonance of the solar panel.According to the actual situation,the load equation of pulsating wind is established to study the effect of constant and variable pulsating wind on the instantaneous response of solar panel within 0.03s.Based on the principle of orthogonal test,numerical calculation is carried out to explore the degree of influence of wind changes,wind direction changes and fixed mode changes on the instantaneous response of solar panel.(3)In order to study the effect of thermal load on solar panels,the heat conduction equation of rectangular unit is deduced based on the first law of thermodynamics,and the thermal boundary conditions are applied to it.The expressions of heat conduction,heat dissipation and heat radiation of solar panels are deduced and carried out.Furthermore,the general elastic force of the flexible plate under thermal load is derived by combining the heat conduction equation,and the dynamic model of the system is obtained.Finally,the temperature changes and internal stress distribution of solar panel in several states are obtained by calculating examples of heat conduction,heat dissipation,heat radiation and thermal strain.Finally,by calculating the natural frequencies of solar panel under different temperature conditions,the influence of thermal load on the natural frequencies of solar panels is obtained.