This paper is concerned with the stationary plane contact of an insulated rigid punch and a half-space which is elastically anisotropic but thermally conducting. The frictional heat generation inside the contact regio...This paper is concerned with the stationary plane contact of an insulated rigid punch and a half-space which is elastically anisotropic but thermally conducting. The frictional heat generation inside the contact region due to the sliding of the punch over the half-space surface and the heat radiation outside the contact region are taken into account. With the help of Fourier integral transform, the problem is reduced to a system of two singular integral equations. The equations are solved numerically by using Gauss-Jacobi and trapezoidal-rule quadratures. The effects of anisotropy and thermal effects are shown graphically.展开更多
为解决工业控制中大惯性、纯滞后、参数时变的非线性受控对象难于控制的问题,提出一种改进的控制算法。该算法采用1个单输入3输出的模糊控制器结构代替3个单输入单输出模糊控制器结构,通过Mam-dani模糊推理运算自调整PID(Proportional I...为解决工业控制中大惯性、纯滞后、参数时变的非线性受控对象难于控制的问题,提出一种改进的控制算法。该算法采用1个单输入3输出的模糊控制器结构代替3个单输入单输出模糊控制器结构,通过Mam-dani模糊推理运算自调整PID(Proportional Integral Derivative)参数,并结合Smith预估补偿控制作用,优化系统动态响应指标,改善了控制器性能。将其应用于注塑机加热过程的温度控制中,并与常规PID控制器和Smith预估PID控制器比较。仿真结果表明,该控制器各项性能均好于其他两种控制器,调节时间为420 s,超调量和稳态误差均为0,具有抗干扰性强和鲁棒性好等优点,为进一步改善注塑机加热过程的实际控制性能提供了理论依据。展开更多
Theoretical calculation and experimental results for a polarizer with sinusoidal grooves used in the electron cyclotron resonance heating （ECRH） system of the HL-2A tokamak are presented. The calculation is based on...Theoretical calculation and experimental results for a polarizer with sinusoidal grooves used in the electron cyclotron resonance heating （ECRH） system of the HL-2A tokamak are presented. The calculation is based on an integral method developed in the vector theory of diffraction gratings, and the polarization characteristics obtained with a low-power test are in good agreement with the numerical calculated results. With the polarizer assembled in a miter bend in the ECRH transmission line, pure ordinary mode （O-mode） and extraordinary mode （X-mode） polarized waves are also expected in the high-power experiment, depending on the polarizer rotation angle and the toroidal injection angle of the electron cyclotron （EC） wave beam. Second-harmonic X-mode experiments were successfully explored in HL-2A. Experimental result revealed that the electron temperature increased from 0.8 keV （Ohmic heating phase） to 1.5 keV （second X-mode heating phase）.展开更多
文摘This paper is concerned with the stationary plane contact of an insulated rigid punch and a half-space which is elastically anisotropic but thermally conducting. The frictional heat generation inside the contact region due to the sliding of the punch over the half-space surface and the heat radiation outside the contact region are taken into account. With the help of Fourier integral transform, the problem is reduced to a system of two singular integral equations. The equations are solved numerically by using Gauss-Jacobi and trapezoidal-rule quadratures. The effects of anisotropy and thermal effects are shown graphically.
文摘为解决工业控制中大惯性、纯滞后、参数时变的非线性受控对象难于控制的问题,提出一种改进的控制算法。该算法采用1个单输入3输出的模糊控制器结构代替3个单输入单输出模糊控制器结构,通过Mam-dani模糊推理运算自调整PID(Proportional Integral Derivative)参数,并结合Smith预估补偿控制作用,优化系统动态响应指标,改善了控制器性能。将其应用于注塑机加热过程的温度控制中,并与常规PID控制器和Smith预估PID控制器比较。仿真结果表明,该控制器各项性能均好于其他两种控制器,调节时间为420 s,超调量和稳态误差均为0,具有抗干扰性强和鲁棒性好等优点,为进一步改善注塑机加热过程的实际控制性能提供了理论依据。
文摘Theoretical calculation and experimental results for a polarizer with sinusoidal grooves used in the electron cyclotron resonance heating （ECRH） system of the HL-2A tokamak are presented. The calculation is based on an integral method developed in the vector theory of diffraction gratings, and the polarization characteristics obtained with a low-power test are in good agreement with the numerical calculated results. With the polarizer assembled in a miter bend in the ECRH transmission line, pure ordinary mode （O-mode） and extraordinary mode （X-mode） polarized waves are also expected in the high-power experiment, depending on the polarizer rotation angle and the toroidal injection angle of the electron cyclotron （EC） wave beam. Second-harmonic X-mode experiments were successfully explored in HL-2A. Experimental result revealed that the electron temperature increased from 0.8 keV （Ohmic heating phase） to 1.5 keV （second X-mode heating phase）.
