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Numerical simulation of a complete gas turbine engine working with inlet cooling of water injection has been evaluated using computational fluid dynamic (CFD), the influence of water droplet and injection rate on the compressor operation, engine combustion and the turbine were studied. The results obtained in contrast with dry compression unveil that, with minimum amount of water droplet and high...
In order to meet modeling accurately and fault simulation required, according to the working principle of Solid Oxide Fuel Cell(SOFC) Generated Elections System, dividing function module, analyzing which fault modes, building fault mathematical model and verifying model. The result shows the SOFC system fault model reflect the relation among the different module clearly and simulate fault mode effective...
This paper proposes the application of multiobjective model predictive control to achieve a dynamic optimization of boiler combustion system. The utopia point of the multi-objective model predictive control system is firstly calculated, and the optimal control sequence is then determined by finding the trade-off solution closed to the utopia point. By using this approach, the arbitrary weighting functions,...
In order to extend the life of the Solid Oxide Fuel Cell system and maximize the performance of the stack, it is very important to study the fault diagnosis method of SOFC system. At First, this paper analyzes the phenomenon and mechanism of the blower fault and leakage fault for the SOFC system. At last, this paper introduce a method which uses the fault tree method to diagnose the external system...
In this research, we try to model soot dynamics in a gasoline engine by using measurement data. In prior to the modeling, a problem of input selection is addressed, and Li regularization-based solution is proposed. The constructed soot model will be utilized for further developing and improving transient injection control.
The combustion characteristics of non-premixed natural gas-air in industrial furnace were investigated using Computational Fluid Dynamics (CFD) approach. The study aimed to predict the effect of the air-fuel ratio on the temperature distribution and pollutant emission at the exhaust gas. The boiler under investigation is a 85 MWe, wall firing boiler with nine radially stratified flame core burners...
The paper proposes a batch-fired straw boiler model, which is used to control the temperature of the combustion chamber. This model describes a boiler which consists of a combustion chamber and a water jacket. The combustion chamber is blown by the adjustable air mass flow, which is used for straw combustion in the combustion chamber. The combustion chamber heats a water jacket, which in turn transfers...
This paper presents an H∞ control scheme for gasoline engines based on a mean-value model. First, a linearized model based on a mean-valve nonlinear model of the engines is proposed that represents dynamical behavior under the multi-input excitation of the fuel injection and the throttle opening around an operating condition. Then, for the feedback control system to regulate of the speed and the air-fuel...
The combustion system of Circulating Fluidized Bed (CFB) boiler is a strong-coupled non-linear system with large delay. Bed temperature is one of the most important parameters, which influences the safety of unit and couples with the main steam pressure strongly. A reliable control method is beneficial to suppress the temperature fluctuation. In this paper, a fuzzy PI controller based on Genetic Algorithm...
The article deal with the modelling of processes in the area of the raw material processing using service oriented architecture (SOA) in the web services (WS) form, as well. There are analysed processes and their models with aim to describe elementary processes in the area of processing the raw materials. At the base on analysis there are suggested support tools and elementary models of the mixing,...
Precise air-path control of heavy-duty diesel engines contributes to emission regulation and high engine efficiency. The air path with VGT and EGR system is highly nonlinear with non-minimum-phase-system properties. The authors present a nonlinear control design - Receding Horizon Sliding Control (RHSC) to solve the tracking problem of the air-path. This control method handles the nonlinear dynamic...
Control-oriented models are often required for developing and validating the corresponding engine control strategies. In this paper, a crank-angle-resolved (CAR) engine model is first developed for a dual-mode turbulent jet ignition (DM-TJI) engine based on the previous developed combustion model for a rapid compression machine (RCM) with a conventional turbulent jet ignition (TJI) system. Different...
This paper describes the study for the design of a predictive controller based on the parametric model obtained for a dryer cocoa plant. The drying system is a nonlinear process, the parametric model obtained is nonlinear, these conditions allowed test the performance of algorithm NEPSAC (extended, predictive and self-adaptive nonlinear controller). It shows characteristics of the plant and a brief...
In this study, the modeling of the effect of exhaust gas recirculation on Homogenous Charge Compression Ignition (HCCI) in Diesel Engine has been investigated. The efficiency and emission reduction of the engine were an important point of view from study charge compression ignition. Furthermore, the greater adoption of the diesel engine has been inhibited by the increasing public awareness on pollution...
Active disturbance rejection control (ADRC) is applied in fluidized bed combustor (FBC) facing some control difficulty. By analyzing the difficulties, ADRC controllers are designed for the power loop and the bed temperature loop of FBC system. The simulation demonstrates both loops with ADRC have a better tracking speed and a stronger robustness, the power loop can inhibit the input and output disturbance...
Legislation concerning the pollutant emissions of diesel passenger cars is becoming increasingly restrictive, especially for nitrogen oxide (NOx) and particulate matter (PM). A methodology that combined physical approach and a dynamic output feedback based observer for the modelling and estimation of the pollutant emissions in diesel engines is thus proposed. A grey box control-oriented model of NOx...
In this paper, a realistic excess oxygen model parameter identification by Standard Genetic Algorithms (SGAs) is proposed and demonstrated. The realistic excess oxygen model is developed by three sub-model; air-fuel ratio conversion model, dynamic continuous transfer function and excess oxygen look-up table to characterise the real excess oxygen plant's numerical data. The predetermined time constant...
This paper is concerned with the air/fuel ratio control of direct injected, spark ignition (SI) combustion engines. The air/fuel ratio is essential for torque generation together with emissions and requires therefore a precise regulation. The system dynamics are modeled for controller design as a first order linear parameter-varying (LPV) system plus parameter varying time delay where the time delay...
This paper proposes a model predictive torque control strategy for Spark Ignition (SI) engines with external Exhaust Gas Recirculation (EGR). The proposed Nonlinear (economic) Model Predictive Controller (NMPC) tries to minimize fuel consumption with given Indicate Mean Effective Pressure (IMEP) tracking reference and abnormal combustion constraints like knock and combustion stability. A Nonlinear...
The paper presents an approach that is new for aviation-related ecology. The approch allows defining spatial distribution of pollutant concentrations released at engine ground running procedure (GRP) using full gas-dynamic models. For the first time such a task is modeled in three-dimensional approximation in the framework of the numerical solution of the Navier-Stokes equations with taking into account...
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