This paper shows that traditional methods for design of PID controllers can be related to robust H∞ control. In particular it is shown that the specifications in terms of maximum sensitivity and maximum complementary...
详细信息
This paper shows that traditional methods for design of PID controllers can be related to robust H∞ control. In particular it is shown that the specifications in terms of maximum sensitivity and maximum complementary sensitivity are related to the weighted H∞ norm introduced by Glover and McFarlane (1989). It is also shown that the Vinniecomb metric can be used to classify the classes of systems that can be stabilized with the design methods in Astrom et al. (1998) and Panagopoulos (1998).
Quantitative Feedback Theory (QFT) was applied successfully to enhance the robust stability and tracking performance of the pitch flight controlsystem for a remote pilotless vehicle (RPV), within its full flight enve...
详细信息
Quantitative Feedback Theory (QFT) was applied successfully to enhance the robust stability and tracking performance of the pitch flight controlsystem for a remote pilotless vehicle (RPV), within its full flight envelope. The influence of control surface loss or damage to the dynamic derivatives of the aircraft model can be treated as an extension of the model uncertainty robustness problem. QFT is applied to the analysis and design of the fault tolerant flight controlsystem allowing for possible control surface damages.
Experimental results demonstrate that μ synthesis provides an excellent tool for increasing the dynamic stiffness of thrust magnetic thrust bearings. Accurate system modeling and appropriate uncertainty descriptions ...
详细信息
Experimental results demonstrate that μ synthesis provides an excellent tool for increasing the dynamic stiffness of thrust magnetic thrust bearings. Accurate system modeling and appropriate uncertainty descriptions are critical to obtaining such results and are described in detail. Both complex μ and mixed μ synthesis were used to designcontrollers. The performance of the μ controllers is compared to that of an optimized PID controller. The dynamic stiffness of the spindle's thrust axis was increased by a factor of two over that obtained with optimized PID control.
In this paper, we present a systemdesign criterion which improves the performance of the general multivariable linear system with unmeasured external disturbances. We use the Lyapunov function to find the upper bound...
详细信息
In this paper, we present a systemdesign criterion which improves the performance of the general multivariable linear system with unmeasured external disturbances. We use the Lyapunov function to find the upper bound of the Integral Square Error (ISE) which serves as a measurement of system performance in process control. We point out the relationship between the upper bound of ISE and the related convergence rate. The design criterion shows how the system matrix plays an important role in reducing overall ISE. The results presented can be used as a general systemdesign criterion for a multivariable linear system with better disturbance rejection.
This paper presents the proposal of an cacsd (computer-aidedcontrolsystemdesign) environment integrated with an ERP (Enterprise Resource Planning) system, aimed to the study, design and optimization of controllers ...
详细信息
This paper presents the proposal of an cacsd (computer-aidedcontrolsystemdesign) environment integrated with an ERP (Enterprise Resource Planning) system, aimed to the study, design and optimization of controllers for the most varied shop floor plants, from mechatronics systems to industrial processes. More specific optimization, control and supervision methods to the company are very important and necessary at the shop floor level. In this level, the motivation on integrate the machines and production cells to the higher hierarchical levels of the company appears in most expressive way. The VIEnCoD (Virtual Instrumentation-based Integrated Environment for controllers design) assist such objectives giving integral support to the whole controlsystem Development Cycle, from the phase of Identification and Modelling of the plant to the controller's Synthesis.
A novel control scheme for nonlinear multi-input multi-output (MIMO) systems which have unstable zero dynamics is presented. The proposed approach consists of a state-feedback controller which simultaneously achieves ...
详细信息
A novel control scheme for nonlinear multi-input multi-output (MIMO) systems which have unstable zero dynamics is presented. The proposed approach consists of a state-feedback controller which simultaneously achieves the input-output linearization of the nonlinear system and stabilizes the internal dynamics using a Lyapunov-based scheme. The approach is used to design a nonlinear MIMO voltage and speed regulator for a single machine infinite bus power system.
A number of researchers have been investigating the use of Stewart platforms (or hexapods) for precision applications. This paper presents a new dynamic model suitable for control of flexure jointed hexapods. Novel co...
详细信息
A number of researchers have been investigating the use of Stewart platforms (or hexapods) for precision applications. This paper presents a new dynamic model suitable for control of flexure jointed hexapods. Novel contributions include: (1) Base acceleration inputs are included;(2) The dynamic model is experimentally verified;(3) The model is developed so that, it is suitable for control, and (4) a decoupled force control is derived.
This paper describes design of a flight controlsystem for propulsion controlled aircraft (PCA), which are controlled using thrust only. Particularly, approach and landing phase is considered because it is the most cr...
详细信息
This paper describes design of a flight controlsystem for propulsion controlled aircraft (PCA), which are controlled using thrust only. Particularly, approach and landing phase is considered because it is the most critical one in flight control. The ILS-coupled automatic approach and landing flight controlsystem is designed for a large transport aircraft, B-747 via H∞ state-feedback control. In the design, the guidance and control loops are designed at a time, which makes it easy to optimize the whole system performance unlike one-by-one loop closure in classical control. The effectiveness of the controlsystem is shown through computer simulation using a linear model of the B-747 aircraft in approach configuration.
Digital system upsets can occur as a result of electrical transients induced by electromagnetic fields. One possible upset is the irrecoverable loss of sensor data due to noisy readings or data changes in the input ci...
详细信息
Digital system upsets can occur as a result of electrical transients induced by electromagnetic fields. One possible upset is the irrecoverable loss of sensor data due to noisy readings or data changes in the input circuitry. The controlsystem may not perform adequately when faced with such modes of failure. The present paper focuses on a technique in which a virtual closed loop is used to overcome these modes of failure. The advantage of using this technique is confirmed by results from a DC motor controlsystem set-up in electromagnetic environments.
This paper presents a synthetic design procedure of robust LQ optimal controller for refining process, including modeling and robust optimal systemdesigning. The paper discusses three major topics: mathematical model...
详细信息
This paper presents a synthetic design procedure of robust LQ optimal controller for refining process, including modeling and robust optimal systemdesigning. The paper discusses three major topics: mathematical modeling of the process with large uncertainty, determination of a synthetic performance index for optimizing the process, and design of the robust optimal controlsystem with robust guaranteed stability. This research is a part of preliminary results of the real refining process optimal controlsystem implemented in Minfeng Paper Mill, Zhejiang Province. Simulation test results show that the proposed modeling and control algorithms are efficient and practicable.
暂无评论