General Electric Company

Shanghai Jiaotong University

Na Ni

Qiang Li

Yong Yang

Xu Fu

Hai Qiu

Yao Yao

Zhilin Wu

Lihan He

Xiaofeng Zhao

Gerald Addison Curtin, Jr

Myungkeun Yoon

Fangwei Guo

Huangyue Cai

Wei Hao

Meiyu Yi

A method for the preparation of a dense HfC(Si)&#x2014;HfBcomposite ceramic. hafnium oxide powders, nano-sized carbon black and silicon hexaboride powders are mixed in a molar ratio of (1-10):(1-20):(1-5) to obtain a powder mixture. The powder mixture is subjected to ball milling, dried and transferred to a graphite mold for spark plasma sintering. In this way, an in-situ carbon-boron reduction reaction and the sintering densification are completed in one step, and the obtained HfC(Si)&#x2014;HfBcomposite ceramic has a density of 94.0%-100% and uniformly dispersed grains.

Method for preparation of dense HfC(Si)&#x2014;HfBcomposite ceramic

A wind turbine includes multiple blades, multiple Micro Inertial Measurement Units (MIMUs) for sensing parameter signals of the blades, and a control system. The control system includes a blade bending moment calculation unit, a blade bending moment error signal calculation unit, and a pitch angle compensation command calculation unit. The blade bending moment calculation unit is used for calculating blade bending moment values of the blades based at least on the sensed parameters. The blade bending moment error signal calculation unit is used for calculating blade bending moment error signals of the blades based on the calculated blade bending moment values of the blades and multiple blade bending moment commands. The pitch angle compensation command calculation unit is used for calculating pitch angle compensation commands of the blades based on the calculated blade bending moment error signals to adjust pitch angles of the blades respectively.

Control system and method for mitigating rotor imbalance on a wind turbine

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Shanghai, China

Na Ni