The perturbation method is used to solve the control equations of a three-dimensional annular flow inside a small gap. The nonlinear equations are separated into zeroth-order and first-order perturbation equations. Th...The perturbation method is used to solve the control equations of a three-dimensional annular flow inside a small gap. The nonlinear equations are separated into zeroth-order and first-order perturbation equations. The velocity and pressure distributions are solved successively by different numerical methods with the zeroth-order and first-order equation. Agreement in results is found with the present method and software ANSYS-CFX, which illustrates the applicability of perturbation method in solving complicated flow field inside small gaps.展开更多
A compact annular-radial-orifice flow magnetorheological(MR)valve was developed to investigate the effects of radial resistance gap on pressure drop.The fluid flow paths of this proposed MR valve consist of a single a...A compact annular-radial-orifice flow magnetorheological(MR)valve was developed to investigate the effects of radial resistance gap on pressure drop.The fluid flow paths of this proposed MR valve consist of a single annular flow channel,a single radial flow channel and an orifice flow channel through structure design.The finite element modelling and simulation analysis of the MR valve was carried out using ANSYS/Emag software to investigate the changes of the magnetic flux density and yield stress along the fluid flow paths under the four different radial resistance gaps.Moreover,the experimental tests were also conducted to evaluate the pressure drop,showing that the proposed MR valve has significantly improved its pressure drop at 0.5 mm width of the radial resistance gap when the annular resistance gap is fixed at 1 mm.展开更多
针对传统旋转电-机械转换器静态特性线性度不高、工作范围小的问题,设计了一种新型旋转比例电-机械转换器,采用磁路解析、Maxwell 3D静磁场有限元分析和实验测试等方法研究了旋转比例电-机械转换器的静态特性,并加工了样机,进行了相关...针对传统旋转电-机械转换器静态特性线性度不高、工作范围小的问题,设计了一种新型旋转比例电-机械转换器,采用磁路解析、Maxwell 3D静磁场有限元分析和实验测试等方法研究了旋转比例电-机械转换器的静态特性,并加工了样机,进行了相关实验研究。实验结果表明,电-机械转换器工作范围为-5~5°,最大输出力矩约为±252 m N·m,具有正的磁弹簧刚度,实验与仿真的差值集中在9.6 m N·m以内,相对误差基本小于6%;电-机械转换器具有良好的重复精度,转角-力矩特性曲线非线性误差小于1.5%,滞环小于3.5%,电流-力矩特性曲线具有很好的线性度及较小的滞环,测试结果与仿真结果基本一致。展开更多
文摘The perturbation method is used to solve the control equations of a three-dimensional annular flow inside a small gap. The nonlinear equations are separated into zeroth-order and first-order perturbation equations. The velocity and pressure distributions are solved successively by different numerical methods with the zeroth-order and first-order equation. Agreement in results is found with the present method and software ANSYS-CFX, which illustrates the applicability of perturbation method in solving complicated flow field inside small gaps.
基金Supported by the National Natural Science Foundation of China(51765016,51475165,11462004)the Jiangxi Provincial Foundation for Leaders of Academic and Disciplines in Science(20162BCB22019)5511 Science and Technology Innovation Talent Project of Jiangxi Province(20165BCB18011)
文摘A compact annular-radial-orifice flow magnetorheological(MR)valve was developed to investigate the effects of radial resistance gap on pressure drop.The fluid flow paths of this proposed MR valve consist of a single annular flow channel,a single radial flow channel and an orifice flow channel through structure design.The finite element modelling and simulation analysis of the MR valve was carried out using ANSYS/Emag software to investigate the changes of the magnetic flux density and yield stress along the fluid flow paths under the four different radial resistance gaps.Moreover,the experimental tests were also conducted to evaluate the pressure drop,showing that the proposed MR valve has significantly improved its pressure drop at 0.5 mm width of the radial resistance gap when the annular resistance gap is fixed at 1 mm.
文摘针对传统旋转电-机械转换器静态特性线性度不高、工作范围小的问题,设计了一种新型旋转比例电-机械转换器,采用磁路解析、Maxwell 3D静磁场有限元分析和实验测试等方法研究了旋转比例电-机械转换器的静态特性,并加工了样机,进行了相关实验研究。实验结果表明,电-机械转换器工作范围为-5~5°,最大输出力矩约为±252 m N·m,具有正的磁弹簧刚度,实验与仿真的差值集中在9.6 m N·m以内,相对误差基本小于6%;电-机械转换器具有良好的重复精度,转角-力矩特性曲线非线性误差小于1.5%,滞环小于3.5%,电流-力矩特性曲线具有很好的线性度及较小的滞环,测试结果与仿真结果基本一致。
