期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
推移偏差补偿下的煤层倾斜综采面液压支架控制方法设计
1
作者 王宝录 《液压气动与密封》 2024年第6期85-90,共6页
倾斜综采面液压支架控制参数由二自由度的液压支架运动学模型求解得到,容易受到液压支架支护效率和摩擦系数、掩护梁外载荷、作用位置、立柱千斤顶倾角、水平千斤顶倾角等因素影响,同时,不可直接测量的内部状态变量影响力扩大,产生推移... 倾斜综采面液压支架控制参数由二自由度的液压支架运动学模型求解得到,容易受到液压支架支护效率和摩擦系数、掩护梁外载荷、作用位置、立柱千斤顶倾角、水平千斤顶倾角等因素影响,同时,不可直接测量的内部状态变量影响力扩大,产生推移偏差,控制效果和效率不佳。提出推移偏差补偿下的煤层倾斜综采面液压支架控制方法。通过建立液压支架底座笛卡尔坐标系并分析液压支架的初始状态变量和位姿偏移情况,可以确定控制参考线的位置。通过状态方程和观测方程来描述液压支架在控制参考线上的位姿状态,分析液压支架的最优推移距离,计算轨迹预测的推移距离补偿量。利用最大熵卡尔曼滤波方法,根据增益矩阵和推移距离误差协方差矩阵,通过推移距离补偿量补偿控制误差,从而实现高精度控制。实验结果表明,支架位姿控制信号与实际位姿控制信号的波动程度相似度较高,稳定性较好,液压支架控制时间在89.5~95.1 ms之间,保证经过补偿后的液压支架控制精度更高,控制响应快,效率高,适合于实际应用。 展开更多
关键词 煤层倾斜综采面 液压支架控制 最大熵卡尔曼滤波 控制参考线
下载PDF
L_1 adaptive controller of nonlinear reference system in presence of unmatched uncertainties
2
作者 宋海涛 张涛 张国良 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第4期834-840,共7页
An extension of L_1 adaptive control is proposed for the unmatched uncertain nonlinear system with the nonlinear reference system that defines the performance specifications. The control law adapts fast and tracks the... An extension of L_1 adaptive control is proposed for the unmatched uncertain nonlinear system with the nonlinear reference system that defines the performance specifications. The control law adapts fast and tracks the reference system with the guaranteed robustness and transient performance in the presence of unmatched uncertainties. The interval analysis is used to build the quasi-linear parameter-varying model of unmatched nonlinear system, and the robust stability of the proposed controller is addressed by sum of squares programming. The transient performance analysis shows that within the limit of hardware a large adaption gain can improve the asymptotic tracking performance. Simulation results are provided to demonstrate the theoretical findings of the proposed controller. 展开更多
关键词 L1 adaptive controller unmatched uncertainties ROBUSTNESS transient performance
下载PDF
Simultaneous optimization and control for polypropylene grade transition with two-layer hierarchical structure
3
作者 娄海川 苏宏业 +3 位作者 古勇 谢磊 荣冈 侯卫锋 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第12期2053-2064,共12页
In this paper,a two-layer hierarchical structure of optimization and control for polypropylene grade transition was raised to overcome process uncertain disturbances that led to the large deviation between the open-lo... In this paper,a two-layer hierarchical structure of optimization and control for polypropylene grade transition was raised to overcome process uncertain disturbances that led to the large deviation between the open-loop reference trajectory and the actual process.In the upper layer,the variant time scale based control vector parametric methods(VTS-CVP) was used for dynamic optimization of transition reference trajectory,while nonlinear model predictive controller(NMPC) based on closed-loop subspace and piece-wise linear(SSARX-PWL) model in the lower layer was tracking to the reference trajectory from the upper layer for overcoming high-frequency disturbances.Besides,mechanism about trajectory deviation detection and optimal trajectory updating online were introduced to ensure a smooth transition for the entire process.The proposed method was validated with the real data from an industrial double-loop propylene polymerization reaction process with developed dynamic mechanism mathematical model. 展开更多
关键词 Polypropylene Grade transition Two-layer hierarchical structure Deviation detection
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部