Reliability Evaluation And Optimization Design Of The Gear Transmission System For The Wind-driven Generator Based On Dynamic

As the energy and environmental problem being become more severe, wind-power generation gets the fast development worldwide. The wind-driven generator, as the key equipment of wind-power generation system, because its special environment for varying load condition and high erection etc, demands to have long life (15-20 years), high reliability, light, apt to maintenance and economy. However, wind-driven generator that design and manufacture in domestic fails to meet the above requests. Therebefore, reliability assessment and parameter optimization design of gear transmission system of wind-driven generator become one of the great urgent tasks.The thesis subject is supported by National Natural Science Foundation and National Supporting Plan Project. Regarding gear transmission system of wind-driven generator 1.5MW as object, research the reliability assessment and optimization design of parameter of the system in the varying load condition due to wind speed change on Wind Farm. It has offered the method with rational science and theoretical foundation for the fact that the production of the wind-driven generator designed and made in domestic.Concrete research work is as follows:①elastic dynamics model of system considered translational degrees of freedom and rotational degree of freedom is set up. According to behavior of wind power system, the external excitation caused by wind speed changes is analyzed, at the same time, the influence of the time-varying stiffness excitation, deviation excitation and damping on the dynamics system is also considered.②Dynamics differential equation is solved by using the method of mode superposition to solve. Under the circumstances that the wind force changes, the expressions of the use coefficient, dynamic load coefficient and load Coefficient of rolling bearing are provided .It offers the rational method of science for the value of load coefficient.③After completed Failure Modes & Effects Assessment (FMEA) of the system, with the wind force considered, the reliability assessment model of the system based on dynamics is set up, as to the existing reliability assessment model, this method is more accurate. ④Optimization design model of system based on dynamics with minimal volume is described, in which the equal-strength principle are considered. UseMATLAB optimization toolbox to optimize the model,and the design parameter after optimizing can reduce volume (weight) of obviously.⑤It is provided that the detailed design process of system, and compare it with the regular design method, the result proves fully the reliability assessment method of this thesis more accurate than the assessment method of regular reliability, and the systematic reliability of improvement that the design parameter after optimizing can be effective, and reduce obviously systematic weight and volume. The research results of this thesis have offered an effective route for the fact that the design and manufacture of wind-driven generator made in domestic.