Structural Mechanics Of Composite Flywheel For Energy Storage And Energy Storage

The using of flywheel energy storage is an effective way which can solve energy shortages problem. Many non-renewable energy is using currently, and in order to increasing the utilization rate, many researchers around the world are doing so persistent effort that a variety of ways to taking advantage of energy storage had been used. However, the utilization rate of traditional energy storage method is not high, and the energy conversion process is complex, and flywheel energy storage which can be an effective solution to this problem is a kind of green environmental energy storage way.In this article, substantial domestic and foreign literature are consulted, in allusion to circumferential coiled carbon fiber composite flywheel rotor, the inductive analysis are made which include the overall stress level, energy storage density and speed of the impact of factors, and the guiding significance conclusions optimizing the flywheel energy storage system are found. Using the mechanics related to basic knowledge and the finite element method derivate flywheel rotor stress-strain analytical expression, and combining the comparison of ANSYS software simulation results to verify the accuracy of analytical expression proving that the error floats in a minimal range. Selecting three commonly used Wheel hub materials, and comparing the stress of wheel hub and the flange, with the analysis results of radial and circumferential stress which are three different materials in the same speed, determining which the aluminum alloy material is more suitable to reduce the flywheel overall stress level and optimize the energy density. Aiming the different modulus ratio of flywheel materials impacting on the flywheel, which results the selection principle of the radius ratio of flywheel both inside and outside. With a practical example for the analysis basis, optimizing the factors of the structure and materials affecting flywheel energy storage density, and a kind of optimum design method which consistent with it is proposed, which meets the request of composite material strength criterion.When optimizing the energy storage of a flywheel energy storage system, we need to predict the failure of the rotor to determine the greatest possible flywheel speed. Select two types of domestic and foreign carbon fiber/epoxy composite materials respectively , use the optimized rotor dimensions of the flywheel and ANSYS finite element analysis software to set up the flywheel rotor model, extract the radial stress along the radius direction, circumferential stress and shear stress and compute the convergence of the failure criterion combined with the corresponding material strength, and accordingly, to determine the maximum flywheel rotor rotation speed and make sure the flywheel failure because of overload does not occur at job states .The results show that the ANSYS finite element rotor model can be well used for the analysis of the rotor failure mechanism.