Search results for: Huacong Li
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Scramjet combustor states parameters dynamic characteristics study have great importance in scramjet accuracy thermodynamics regulations. In this investigation the dynamic response characteristics of kerosene-fueled scramjet combustor wall pressures are studied by time-frequency domain analysis method. Firstly, the dynamic response of scramjet combustor wall pressure is stimulated by step input of...
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This paper aims to improve the inlet flow performance of the centrifugal pump with multi-diversion compound impeller structural, the ejector was used to decrease the secondary vortex flow characteristics and improve boosting capability of the centrifugal pump. This paper presents the numerical simulation study on multi-diversion compound impeller structural centrifugal pump by using CFD method under...
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This paper aims to investigate problems of multivariable controller design for Aeroengine. A design method of model reference adaptive control system was established based on the theory of super stability. By ensuring the global stability and asymptotic stability of the system, the adaptive controller of aeroengine was carried out by using this method. The tracking performance, anti-interference ability...
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A new adaptive compensation control method was developed to improve the control performance of multivariable system which affected by uncertainty. In this paper, a basic optimal LQR control law was compensated by the augmented model reference adaptive method under the framework of feedback control structure, to improve the dynamic and anti-interference performance of the system which affected by uncertainty...
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The dramatic changes of dynamics characteristics of aeroengine, the aero dynamics effects together with the wide range of flight envelope, it is required that the controller can adapt to the large parameter variation range and has good robustness. To address the above problems, a new turbofan engine Multivariable robust gain scheduled LPV control algorithm based the closed-loop system regional pole...
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For coordinating and high-precision control of the lower limb wearable exoskeleton, surface electromyography (sEMG) which reflected the neuromuscular activity is chosen as the main signal source to obtain more accurate motion pattern in this paper. At first, 4-channel sEMG signals which can be described separately as biceps femoris, vastus medialis, rectus femoris, and gastrocnemius are collected...
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Proceedings of the 32nd Chinese Control Conference > 3059 - 3063
Aimed at the non-ASPR model of aeroengine, a new kind of direct adaptive controller of turbofan engine control system is put forward. The structure of a Command Generator Tracker (CGT)-based direct adaptive controller is simple, and no filter is needed. However, the controlled plants are required to be almost strictly positive real(ASPR), which limits its applications. For this, a Parallel Feedback...
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Proceedings of the 32nd Chinese Control Conference > 3064 - 3067
This article puts forward an aeroengine multivariable robust adapting control method to solve those characteristic of areoengine: high non-linear and uncertain model. The method based on the principle of CGT robust adapting control, combines the rectified rule of parameter adapting with the robust item based on σ correction, avoids the design of mutivariable decoupling controller, and improves the...
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To improve the tracking and global convergence performance, a iterative learning controller is designed for aeroengine nozzle actuating system. The global convergence and design method of this iterative learning controller are derived. The rapid and accurate tracking performances of the designed controller are illustrated by simulation on an aeroengine nozzle actuating system. Then the feasibility...
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This paper presents a new parameter-scheduled controller design and solving method for turbofan engine polynomial linear parameter varying (PLPV) model in nonconvex domain. In this method, the parameterized linear matrix inequalities (PLMI)-typed sufficient conditions based on parameterized Lyapunov function (PLF) are given, which can guarantee multi-objective robust performances of the control system...
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Desalination > 2008 > 222 > 1-3 > 646-655
This paper presents an open air–vapor compression refrigeration system for both air-conditioning and desalination on ship cooled by seawater, and proves its feasibility through performance simulation. Pinch technology is used in the analysis of heat exchange in the surface heat exchanger and the temperature difference at pinch point is selected as 6°C. The freshwater is obtained from the dehumidification...
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Energy Conversion and Management > 2007 > 48 > 8 > 2255-2260
This paper presents an open air–vapor compression refrigeration system for air conditioning and hot water cooled by cool water and proves its feasibility through performance simulation. Pinch technology is used in analysis of heat exchange in the surface heat exchanger, and the temperature difference at the pinch point is selected as 6°C. Its refrigeration depends mainly on both air and vapor, more...
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According to the optimization control modes of performance seeking control (PSC) in aeroengine, the aeroengine performance optimization problems which were described as a linear programming problem are studied. In respect that the linear programming is only guaranteed to converge to a local minimized and nonlinear method is much more computation, a hybrid algorithm based on linear programming (LP)...
