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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...
The main objective of this study was to develop a model for performance analysis of a spark ignition engine fueled with propane and octane. GT-Suite software was used to develop the model for a single cylinder 4-stroke gasoline engine having a bore of 85 mm and a stroke of 85 mm with a capacity of 0.48 litres. A one-dimensional gas dynamics was considered for heat transfer model development for different...
In this paper, on the basis of sliding mode control theory, a new integral tangent adaptive fuzzy sliding mode control for aircraft engine was proposed. Based on the uncertainty model of aircraft engine, a hyperbolic tangent integral sliding surface was constructed at first, and it effectively overcome the problem of integral saturation effect which was often occur in the traditional integral sliding...
In this paper, a new fault identification scheme is proposed for turboshaft engines, in which a fractional-order sliding mode observer is designed to reconstruct the fault signal. A fractional-order sliding surface is adopted. The reachability of sliding mode and the convergence of fault reconstruction error are proven. Simulation on a turboshaft engine model demonstrate the excellent effect of the...
In this paper, firstly, the energy conservation equation of the cold side and the hot side of the precooler is written according to the energy conservation. Then the model of the precooler is established based on Matlab S-Function, and the model is simulated. The cold side helium mass flow is reduced to obtain the curve of the heat side temperature change, and the transfer function of the cold side...
As one of automotive engine's important working states, idle-speed has much relation to the engine's fuel consumption and exhaust-gas pollution level. Effective idle speed control (ISC) can improve fuel economy and reduce exhaust emissions, the principal operation of ISC is to uphold the actual engine speed very close to the set point value when any disturbance is added. Automotive engines are typical...
This paper focused on the aerodynamic modeling for hypersonic flight vehicles, taking into account the scramjet effects on aerodynamics. A methodology was proposed for aerodynamic modeling in this case. First, aerodynamic models were identified at each Mach number with the scramjet engine off. Then, the differences between aerodynamics with engine on and those with engine off were modeled to describe...
In this paper we develop a non-intrusive model-based catalyst monitoring algorithm that operates by determining the magnitude of the catalyst's frequency-domain transfer function in a specific range of frequencies corresponding to a small-amplitude square-wave input command. This method requires the calibration of two parameters within a simple catalyst model consisting of a system gain, a time delay,...
Net recovery is an advanced accurate-point recovery way for small fixed-wing unmanned aerial vehicles (UAVs), especially in limited recovery fields or naval vessels. In order to perform recovery successfully, the aerial vehicle must satisfy certain conditions to shut down the engine so that it can glide into the net without a crash. In this paper, an aircraft longitudinal dynamic model is taken into...
In this paper, based on Unreal Engine 4 (UE4) Unmanned Aerial Vehicle (UAV) simulator (AirSim), through AirLib, DroneServe, DroneShell and other modules in AirSim, using window10, 64-bit operating system, Intel Xeon E5-2620 v4 eight cores Dual CPU and Nvidia GeForce GTX 1080 Ti (11263MB / Nvidia) dual graphics card, a virtual reality platform is constructed for UAV deep learning. The platform displays...
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.
Air-fuel ratio control is a crucial problem for engine control since it is one of the most important issues related to pollution reduction. The main difficulty in air-fuel ratio control is the time-varying delay. We propose a new model that includes the delay. This model is identified using real dataset from an engine test bench. The time-varying delay is made constant by using a change of domain...
In air transport, the growing demand in energy along with rising fuel costs is endangering civil aviations optimistic outlook, besides, concerns have focused more on addressing aviations impact on greenhouse gas emissions. Based on the analysis of the necessity of carrying out the work of energy saving, the paper analyzes the factors that have great influences on the energy economy from the multi-criteria...
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...
A novel hardware-in-the-loop (HIL) simulation system of aircraft is presented in this paper. The simulation aims to evaluate the performance of the aircraft flight control system and propulsion system with the influence of coupling characteristics between the two systems. The simulation system is designed and established based on the on-board devices and simulation equipment, such as flight control...
This paper presents a new type of vertical takeoff and landing(VTOL) aircraft, using a new type of vector propulsion scheme is different from the traditional vector propulsion scheme, which can change the three elements of thrust. This paper describes the overall layout and mechanical structure of the new aircraft. The force and moment of the flight are analyzed, and the dynamic model is established...
An asymmetrical engine failure in a multi-engine aircraft during flight can pose an immediate threat and lead to a fatal crash if no appropriate corrective action is taken in time. Although almost all pilots are trained to follow a protocol to manually mitigate the crisis, asymmetrical engine failure still remains as one of the main precursors leading to fatal aircraft crash. In this paper, an automatic...
This paper presents a multi-variable optimal controller design based on model predictive control (MPC) scheme for automotive gasoline engines. The optimal control aims to achieve fast torque tracking with the lower pumping loss, by tuning the throttle valve angle and the intake valve timing. To this end, the nonlinear engine model was built based on the mean-value modeling theory and polynomial technique,...
Single engine failure is a typical asymmetric problem for twin-engine carrier-based aircraft, which induces rolling and yawing divergence and aggravates takeoff performance during catapult launch. Multi-agents dynamics model integrated with aircraft, carrier and sea level atmosphere is established for the analysis of departure characteristics. Numerical simulation results reveal that lateral-directional...
The problem of building statistical models of cyber-physical systems using operational data is addressed in this paper, using thecase study of aircraft engines. These models serve as a complementto physics-based models, which may not accurately reflect the operational performance of systems. The accurate modeling of fuelflow rate is an essential aspect of analyzing aircraft engine performance. In...
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