Trend Of Power Station Carrier, Structural Optimization,

With the consumption of conventional energy source, such as petroleum and coal, it is critical to exploit various kinds of new energy. As one of the new energy, tidal current energy generates electricity by the periodic horizontal movement of tide in sea. Tidal current energy is rich in resources, and its distribution is widespread. It is called low-carbon or the non-carbon energy. As an important part of sustainable development strategy, tidal current energy won't pose the serious threat to the environment. In order to promoting the tidal current energy extraction into use, this paper optimize the "40kW sea-bed tidal current energy independent trial generator item".First, theories about optimization are referred. Considering the large number of design variables, the optimization module in ANSYS is chosen to accomplish this work.Then, according to the reference of the "40kW sea-bed tidal current energy independent trial generator item", the finite element model of the trial generator item is constructed.Third, ABAQUS is used to construct the same model, which compared with the result of ANSYS. The similarity of their results prove the feasible of FEM.Fourth, the load applied on the generator structure is calculated according to the local tidal speed of 3.01 m/s; gravity force of generator was applied on the duct construction by means of even load; the bottom of the foundation is restricted. The result of the FEM indicated that the duct construction is in safe condition, but there existed optimization space.Finally, section data of shell and angle iron are set as design variable, the maximum stress and displacement as state variable, the weight of the structure as objective. The optimization analysis by using the method of sub-problem provided by ANSYS is completed.The results indicate that the shell thickness of the duct construction and the section data of angle iron in directing cover are notability declined, while the section data of angle iron in floating box and sinking box increased. The weight of the structure is declined 32.4%. This result has a guidance meaning to the carrier structure design of tidal current generator.