伴随随机链路动态的复杂网络的双跟踪控制

本文针对随机复杂动态网络,给出了网络在均方意义下实现双跟踪的定义,提出了新的控制策略。本文考虑的复杂网络是由节点与链路共同组成,并且采用两个随机微分方程来对节点与链路的动态分别进行了建模。假设节点的状态信息是可以被利用的,链路的状态信息是不可以被利用的,基于此,在节点中设计了控制器,同时在链路中设计了耦合关系。通过这两个部分的共同作用可以使得节点跟踪上任意给定的跟踪目标,同时链路也可以跟踪上任意给定的跟踪目标。最后给出数值仿真验证了本文所提控制方案的有效性。In this paper, the definition of double tracking in the meaning of mean square for stochastic complex dynamic networks is given, and a new control strategy is proposed. Complex network considered in this paper is composed of nodes and links, and two stochastic differential equations are used to model the dynamics of nodes and links respectively. It is assumed that the state information of the nodes can be used, and the state information of the links can not be used. Based on this, the controller is designed in the node and the coupling relationship is designed in the link. Through the joint action of these two parts, the nodes can track any given tracking targets, and the links can also track any given tracking targets. Finally, numerical simulation is given to verify the effectiveness of the proposed control scheme.

小型材飞剪计算机双位置跟踪控制技术

通过对“万能式”飞剪机械传动系统的分析,提出了飞剪机组的剪刀与轧件位置、偏心轴与剪刀位置的计算机双位置跟踪控制技术和为保证剪切精度的在线轧辊测径技术,它完全达到了型材剪切的要求。通过一年的运行证明,设备达到了无维护、无故障运行的目标,仅提高成材率和降低备件、能源消耗等项费用,就为企业创效50O多万元。这一技术和设备已达到国际同类产品的水平,在中小型材生产线上具有广泛的应用前景。

Synchronization control for electro-hydraulic dual-cylinder system based on force/position switching

If the rigidity of a mechanism is stiff enough, the position synchronous error of the two cylinders driving one degree-of-freedom （DOF） of the mechanism may be less than the resolution of position sensors. To handle this synchronization problem this paper proposes a force/position switching scheme, which partitions the two cylinders into a master cylinder and a slave cylinder. The master cylinder is always position tracking controlled by a second-order sliding mode controller and the slave cylinder is integrated with a force tracking controller which is a first order sliding mode controller. When the position tracking error is less than a given value, the slave cylinder switches to be force controlled. Two synchronization control methods are presented based on the switching scheme： the master - master ＋ force/position switching control and the master - slave ＋ force/position switching control. Simulations show that the formance compared with two given proposed synchronization control position-based control methods. methods can get a better per-

Simulation of grid tracking control of power system connection and maximum power brushless doubly-fed generator in point wind

In this paper, based on the analysis of the mathematical model in a common synchronous reference frame of the brushless doubly-fed generator （BDFG）, the grid connection strategy and maximum energy extraction control were both analyzed. Besides, the transient simula- tion of no-load model and generation model of the BDFG have been developed on the MATLAB/Simulink platform. The test results during cutting-in grid confirmed the good dynamic performance of grid synchronization and effective power control approach for the BDFG-based variable speed wind turbines.

Double-loop robust tracking control for micro machine tools

This paper addresses double-loop robust tracking controller design of the miniaturized linear motor drive precision stage with mass and damping ratio uncertainties. As an inner-loop, a disturbance observer （DOB） is employed to suppress exogenous low frequency disturbances such as friction and cutting force. To further eliminate the residual disturbance and to guarantee the robust tracking to the reference input, μ-synthesis outer-loop controller is designed. For eliminating the steady state error, a technique is proposed to design the μ-synthesis outer-loop controller with an integrator. A guideline to select the bandwidth of the Q-filter in the DOB is provided. Simulations using a model of a prototype micro-milling machine indicate that the proposed outer-loop synthesis scheme is superior to the H∞ suboptimal control in disturbance rejection performance and steady state tracking performance. Furthermore, it is shown experimentally that the proposed double-loop robust tracking controller improves the tracking performance of the stage by 29.6% over PID control with a DOB inner-loop.

OPTIMAL TRACKING FOR BILINEAR STOCHASTIC SYSTEM DRIVEN BY FRACTIONAL BROWNIAN MOTIONS

This paper discusses a problem of optimal tracking for a linear control system driven by fractional Brownian motion.An equation is obtained for the linear Markov feedback control.The existence and uniqueness of the solution to the equation are also studied.