海洋石油平台脚靴的结构优化设计

汇总分析近几年某建造场地所建造的近海海洋平台相关参数,优化脚靴结构形式,使之具有通用性。根据优化后的脚靴结构形式,给出平台称重时的最佳称重系统布置方案,并通过ANSYS软件进行计算校核,优化后的脚靴强度满足施工要求。给出通用脚靴在实际生产应用中的注意事项。     

Optimization of speed response of super-high-speed electric air compressor for hydrogen fuel cell vehicle considering the transient current

A super-high-speed electric air compressor for a hydrogen fuel cell vehicle must have a wide speed range and high-speed regulation response capacity. However, due to the distortion of the air gaps magnetic field of the super-high-speed permanent magnet synchronous motor (SHSPMSM) in the super-high-speed domain, the motor's output torque capacity is reduced. Then its speed regulation response capacity is weakened. To solve this problem, firstly, we analyze the effect of transient current on the speed regulation response of the super-high-speed PMSM. Secondly, we proposed a new speed regulation control method, the transient current injection (TCI) control method. Finally, simulation analysis and experimental results demonstrate the effectiveness of the proposed control method. Under target speed of 151,703 rpm, the average electromagnetic torque of SHSPMSM using the TCI control method is increased by 3%. Furthermore, the speed regulation response time decreased by about 0.49s.     

Energy Stable Nodal Discontinuous Galerkin Methods for Nonlinear Maxwell’s Equations in Multi-dimensions

Journal of Scientific Computing - The scalar, one-dimensional advection equation and heat equation are considered. These equations are discretized in space, using a finite difference method...     

扭摆推力架传感单元理论设计及仿真分析

针对微纳卫星上电推进器产生的推力小量值、测试难,测不准问题,开展小推力测量研究。采用杠杆原理和扭矩平衡原理,建立了5~100 mN扭摆型推力架传感单元机理模型,研究了不同推力作用下的偏转性能,得出了偏转位移与推力的线性关系。采用ANSYS仿真软件对传感单元进行仿真分析,得到不同参数条件下的位移云图,将理论数据与仿真结果进行比较分析,最终表明传感单元结构设计合理。