Papers by Keyword: Stress Characteristics

Abstract: Wind Turbine Blade plays a significant role in the efficiency and durability of the wind turbine. As such it is important to identify different ways how the blade performance can be improved. One of the key variables that affects the blade performance is the stress the blade undergoes over time. This paper describes the stress characteristics of a Horizontal Axis Wind Turbine Blade subject to Aerodynamic Forces under normal operating conditions. The stress and deflection that the blade undergoes when subject to rated wind loads are analysed. The simulation results show that most of the stress was experienced at the interface between the spar and the skin of the blade and hence was ignored. The results also show that the skin stress does not exceed 120 GPa and the maximum deflection does not exceed 7m. The power production results agree for wind speeds up to 15 m/s, after which they deviate.

Abstract: Cao river aqueduct was the largest aqueduct in Asia for its span,the actual stress state of aqueduct structures, and whether the effect of prestressed meet the design requirements all will directly influence the safety operation of aqueduct.Load test is an important means of testing structure design and construction quality of reinforced concrete, and stress test is one of the important methods of monitoring, which can more objectively reflect the real stress condition of structure. Therefore, impounding test of the aqueduct was carried out before formal operation, stress characteristics of the aqueduct under impounding conditions were analyzed in detail. The results analysis shows that the aqueduct were in well flexible working conditions under testing load.These show that the structure design is basically rational; design value of material strength and the actual stiffness of the aqueduct meet design requirements and have a certain degree security reserve. At same time, the test offered a foundation for its later period working.