Disc Type CSP Azimuth Drive Mechanism Analysis Of Bearing Machanical Properties And Fatigue Life Of Key Bearing Components

As one of the most important driving components of disc type solar tracker device, the driving mechanism of azimuth angle has some features including complicated structure, high wind load requirement, long designed service life( ? 25 years)and so on, which will have significantly bad effects on focusing accuracy and safe operation of solar energy power system when it has large deformation and fatigue failure under strong wind. Rotary supporting seat and the worm and gear are the key bearing components of the driving mechanism of azimuth angle, whose mechanical properties and service life have a direct influence on driving mechanism of azimuth angle. Therefore, performing analyses of static and dynamic mechanical properties and fatigue life analysis of key bearing components of the driving mechanism of azimuth angle under designed wind load(grade 8) has a great significance ensuring efficient, reliable and safe working of aforementioned system.First, based on the principle of statics mechanism, bearing properties of aforementioned system under grade 8 wind load were analyzed according to basic structure and working principle of the driving mechanism of azimuth angle, and bearing loads at key position were acquired. 8 groups of larger load-bearing working condition were selected as load condition of static mechanical analyses among 45 groups of working condition compared with each other. The static characteristics of the key components of load-bearing were analyzed numerically using software ABAQUS, and the stress- strain nephogram of each components under working condition of aforementioned 8 groups were obtained. The extent of stress – strain was higher when each components was at 45°-90° working condition, and the strength and rigidity of each components could meet demand under each working condition.Second, fluctuating wind load time history curves are simulated adopting harmonic superposition method using the simulation software MATLAB, and the spectrum curves of all parts under fluctuating wind load were acquired. Transient dynamic characteristics of each components were analyzed using ABAQUS. The dangerous positions and static simulation analyses of each components were identical. The response curves were drafted by extracting stress – strain numerical value, thesafety factors of rotary supporting seat and the worm and gear were calculated as 1.6 and 1.7 respectively, which were under designed safety factor.At last, based on rainflow counting method, fatigue life of each components were calculated simulatively adopting stress life fatigue analysis method(SN) using software Glyphworks. Fatigue life cycles of risk nodes under wind load were obtained, which were 3.816e6, 5.089e6 and 3.274e6 times of rotary supporting seat, worm and gear respectively. Using meteorological data of some areas which had some topographical features where the system was located, limited cycles of each components were calculated as 8.127e5 times when they could meet the design service life, which were higher than their fatigue life cycles and could meet the use requirements.