Study The Dynamic Performance Of The50MW Solar Parabolic Tough Thermal’s Collector Bracket Under Wind Load

With the development of the economy and mass consumption of non-renewable energy，looking for new energy has become a matter of concern around the world. Solar energybecoming more and more valued, while solar thermal power generation has become one of themain directions of solar energy utilization. Currently, solar thermal power generation iscommercialization, standardization of production. Bracket structure of the solar collectortracking system is the main load bearing construction in track system components.Concentrated solar thermal power generation use the solar tracking system to track the sun andabsorb the solar energy and convert into heat energy for power generation.But previous studies have focused mainly on heat, the research of bracket structure mainlyin optimized design followed by static analysis, while little study dynamic properties ofstructure. This paper studies the dynamic character under wind load to provide design referencefor bracket.First, the establishment of finite element model of stent, for modal analysis of stent; theactual model for the appropriate simplified, select bracket in a different location, build supportin the ANSYS finite element models, analysis of modal parameters and their variation indifferent locations of the bracket. The results show that the natural frequency with little changeto the location of the stent, and natural vibration frequency is low.Second, select the largest Windward position, calculated the wind-induced vibrationresponse of structures along wind;Currently, in the wind-resistant design of structures, this paper obtained the wind loadtime-displacement data by numerical simulations. Based on random vibration theory and ARmodel, using MATLAB to write wind load time-history simulation program, access toparabolic level fluctuating wind data, get instantaneous speed by fluctuating wind and averagewind, according to Bernoulli’s equation conversion to obtain wind load time-history curve.Established finite elements model in the ANSYS, select the maximum windward location; apply wind loads to the structure parabolic surface, after a transient analysis, getting thestructure wind loads response. Results indicate that first-order mode shape contributes mostand the maximum displacement is up to0.40216m under wind load. Through the analysis ofstress observation, and concluded that stress will change over time, but does not exceed themaximum value of steel yield limit, is in the context of security. Displacement should bemainly controlled in the design.Finally, simply analysis flow around of parabolic; in this article, supporting structureabove the section of the collector plate is the parabola. This section is not given explicitlyparameters in the specification, Here, using numerical wind tunnel method. Carry outnumerical simulation analysis under different speed of the wind field of the lift coefficientthrough ANSYS-FLUENT, flow pattern and the vortex shedding frequency, concluded that theVortex shedding frequency varying with speed curves, it close to a straight line, basically inline with the Stowe Rojas formula and Stowe Rojas number is0.205. It is relatively close tocylinders. Natural frequency is the integer times of vortex shedding frequency. Harmonicresonance may occur; it is need to be taken attention.