No abstract

As the core component of wind turbine energy conversion, the gearbox has been operating under variable frequency and variable load condition for a long time. The repair time is long after its fault, which leads to a large loss of power generation. This paper proposes a gearbox life prediction method. By collecting the design and manufacturing process parameters of gearbox, the gearbox virtual simulation model is established, the gearbox observable damage can be predicted accurately by inputting the actual operation load. According to the results, the maintenance and repair time of the gearbox can be arranged scientifically, which can effectively avoid the occurrence of serious faults, greatly reduce the gearbox replacement rate and unscheduled downtime, the economic benefits are obvious. After field application, the accuracy of this method can be 93.5%, which has a good prospect of application.

No abstract

Abstract. Based on the facts that there are many kinds of metallic tensile specimens with different dimensions, a set of rectangular cross-section and round cross-section tensile specimens are designed according to China national standard GB228-2002 which is called metallic materials' tensile testing at ambient temperature to meet the needs of routine materials researching and testing in factory. According to the designing specimen, a complete set of permanent die was designed and manufactured. Then, Al-Mg alloy was chosen to do the casting processing experiment, and the tensile specimen was obtained and tensile test was finished. It showed that the designing specimen and permanent die met the requirements of tensile test. The round specimen is stronger than the rectangular one and the particles diameter of the studied Al-Mg alloy is from 20ȝm to 50ȝm.