Simulated Moving Bed (SMB) chromatographic separation processes show typical hybrid phenomena: discrete state jumps and switching dynamics. The SMB principle and two modelling approaches based on hybrid automaton are ...
详细信息
Simulated Moving Bed (SMB) chromatographic separation processes show typical hybrid phenomena: discrete state jumps and switching dynamics. The SMB principle and two modelling approaches based on hybrid automaton are presented and discussed within the context of hybrid systems theory. It is shown how these models are affected by open-loop and closed-loop control.
This paper presents the design of a reconfigurable LPV controller for the Boeing 747-100/200 longitudinal axis The control objectives are to obtain decoupled flight path angle and velocity command tracking during norm...
详细信息
This paper presents the design of a reconfigurable LPV controller for the Boeing 747-100/200 longitudinal axis The control objectives are to obtain decoupled flight path angle and velocity command tracking during normal operation and in the presence of an elevator failure. During normal operations, the controller uses the elevators and thrust for flight maneuvers. In case of elevator fault the control strategy uses th,e stabilizer as the alternative longitudinal control surface. Simulation results with elevator fault present show that the reconfigured controller stabilizes the faulty system.
The paper addresses a model based fault diagnosis for industrial actuators using a timed discrete-event representation. The consistency based diagnosis with timed automata as the timed discrete-event model is discusse...
详细信息
The paper addresses a model based fault diagnosis for industrial actuators using a timed discrete-event representation. The consistency based diagnosis with timed automata as the timed discrete-event model is discussed. An important aspect of this method is the use of the model to build a diagnostic system systematically. The only available information used for diagnosis is given by input and event sequences. The result shows that the temporal information included in the timed automata is beneficial for fault diagnosis of discrete-event systems.
The alteration in wheel and rail profiles due to wear involves considerable vehicle and track-maintenance costs, and influences the loading capacity of the rails, as well as the operation safety and riding comfort of ...
详细信息
The alteration in wheel and rail profiles due to wear involves considerable vehicle and track-maintenance costs, and influences the loading capacity of the rails, as well as the operation safety and riding comfort of the vehicles. (Letter type: Times New Roman, size: 10, line spacing: normal).
Different types of nonlinear controllers are designed and compared for a simple continuous bioreactor operating near optimal productivity. This operating point is located close to a fold bifurcation point. Nonlinear a...
详细信息
This paper attempts to look at the fundamental problem of fault detection and isolation (FDI) in nonlinear systems. Using the idea of input reconstruction by means of dynamic inversion the authors first discuss the pr...
详细信息
The nonlinear dynamic model of gas turbines is derived from first engineering principles, which consists of differential conservation balances completed by algebraic constitutive relations. This nonlinear dynamic mode...
详细信息
The nonlinear dynamic model of gas turbines is derived from first engineering principles, which consists of differential conservation balances completed by algebraic constitutive relations. This nonlinear dynamic model can then be transformed into input-affine form. The coordinate-functions of the state equation f(x) have very complicated algebraic structures, while the functions gi,(x) are constants. Because of this fact, the nonlinear dynamic analysis of the model, such as investigation of controllability and stability, can only be performed with difficulty or in some cases it can not be done. To solve this problem and to investigate the controllability and stability of the model in a more effective way the nonlinear dynamic model has to be transformed into LPV (Linear Parameter-Varying) model. This LPV-model can then be effectively used to develop some types of controllers to improve the dynamic response of the engine. In this paper we show the possible ways and steps of the transformation being neither obvious nor unique and the final form of the LPV-model of a pilot-plant gas turbine, which is installed in the Budapest University of Technology and Economics. Department of Aircraft and Ships on a test stand.
This paper presents a real-time Java hardware and software system for use in embedded applications. The system includes a multithreaded Java microcontroller, an adapted Java Virtual Machine (JVH) and an extended appli...
详细信息
This paper presents a real-time Java hardware and software system for use in embedded applications. The system includes a multithreaded Java microcontroller, an adapted Java Virtual Machine (JVH) and an extended application programming interface (API). The microcontroller core is designed with a multithreaded pipeline and hardware support for real-time scheduling algorithms. The Java Virtual Machine consists of trap routines for complex Java byte-codes, real-time garbage collection and a class loader for creating real-time data structures. On a higher level, the application programming interface provides easy real-time thread management and access to hardware components like serial interfaces and timer/counter units.
A simple nonlinear controller for a low-power gas turbine based on direct passivation is proposed in this paper. It uses a nonlinear state space model of the gas turbine in input-affine form based on first engineering...
详细信息
This paper overviews the anthropogenic greenhouse gas emissions in Hungary in the period 1985-95. The emissions have been determined and reported according to the IPCC methodologies. The emissions of greenhouse gases ...
详细信息
暂无评论