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Transmission on-off valve is an important component in the aircraft fuel system. It is directly related to the fuel supply security during the flight. Erosive wear is the main form of transmission on-off valve failure. it is said that Mathematical modeling of the dynamic characteristics of hydro-mechanical shut-off valves in typical aircraft fuel system, and the failure to model caused by Erosive...
Security is one of the key concerns for control systems. Tools and simulators for the control system security have attracted a lot of attentions recently, because testing new solutions is a very important work for the control system security studies. In this paper, we firstly analyze the challenges of the security simulations for control system. Then, classification study is done for the existing...
This paper presents a three-DOF permanent spherical actuator, with precise measurement system. As magnetic model is very useful to torque model and control model, magnetic model is the basis of spherical actuator study. A new analytical magnetic field model is presented for the proposed 3-DOF spherical actuator in this paper. This analytical magnetic field method combines the Laplace equation with...
Integration of simulators, data sources, optimizers and other tools is discussed in this paper. More exacting requirements on the quality of the plant operation together with environmental limits and lowering energy intensity bring more complex control systems into the everyday life. When controlling the complex multi-variable systems usually variety of control techniques can be applied in all layers...
A novel method for image segmentation is proposed. Considering the segmentation results obtained by using the multiphase Chan-Vese model are dependent on initial conditions, an edge link method is used to obtain initial curve firstly. Based on the Four Color Theorem, we can assume that in general, at most two level set functions are sufficient to detect and represent distinct intensities. Then we...
High performance and economic gains are treated as the main target for future aerospace product design. An inward turning inlet equipped hypersonic vehicle parameterization procedure was devised for collaboration of wingbody and scramjet propulsion system modeling. Top design parameters (free-stream Mach number, flight altitude, mission requests, etc.) drive the overall collaborative system construction...
Artificial Bee Colony (ABC) algorithm is a kind of newly developed bio-inspired intelligence. In this paper, we conduct a investigation on bees' behaviors when seeking for food, and a method for optimizing parameters has been developed. By using this algorithm, we can obtain the best solution to many problems. Pulse Coupled Neural Networks (PCNN) is a kind of algorithm widely used in image processing...
This paper established a simulation platform of intelligent fault diagnosis of traveling hydraulic system for multi-axle driving construction machinery using AMESim software. The corresponding parameter variations under the fault condition can be simulated by changing the parameters of related components in the simulation model, then the system response while the fault can be calculated so that fault...
Pneumatic system operation status and problems were analyzed in the industrial production site; Considering the 24 hours as a time unit, the feature of compressed air consumption was studied every 20 seconds in 24 hours in the industrial production site. Then, presenting a forecasting method, which is workable and the overall mean in line with air consumption changes in the law. This forecasting method...
Focusing on the transitional mode of tiltrotor UAV, which is nonlinear, strongly coupled and uncertain due to its complexity in layout, structure and aerodynamic peculiarity, a control strategy is designed and proposed. First, considering of the aerodynamics of rotor and its tilt machinery, the mathematic model of this kind of UAV is presented. Then, the reasonable anticipant global trajectory is...
Hardware in the Loop Simulation(HILS) plays an increasingly important role in the development and test system of missile. This paper describes the structure and function of a typical HILS Platform for missile testing. The platform has a double computers structure, which consists of the control computer and the simulation computer. The paper analyses the hardware and software requirements and gives...
This paper presents a two layer optimal control scheme with a control layer and an optimize layer. The control layer realize the close-loop control while the optimize layer is used to optimize the control parameters. The optimize layer identify the model of plant on-line and optimize the control parameters based on the identified model. Because the optimize layer is running parallel with controller...
I put forward a new interpolation called Adams-Bashforth interpolation of NURBS (Non-Uniform Rational B-Splines) curve in order to realize higher precision under the condition of satisfying the speed demand. IN this method, I calculated next parameter point by Adams-Bashforth equation and I used difference equation instead of derivation. I simplified and approximated the interpolation algorithm so...
This paper presents a novel model-based approach for the prediction of energy consumption in production plants in order to detect anomalies. A special Ethernet-based data acquisition approach is implemented that features real-time sampling of process and energy data. Hybrid timed automaton models of the supervised production plant are generated and executed in parallel to the system by using data...
As the software intensiveness and complexity of safety critical factory automation systems increases, established safety analysis methods are unable to cope with risks arising from faults that propagate over subsystems and cross the domain boundaries between software, electronics and mechanics. To address this problem, an early simulation based safety analysis method is proposed. After the required...
This article is mainly talking about a molding hydraulic machine realized by telescopic cylinder under the control of constant pressure variable pump. In order to achieve a precise control of prospective pressure conditions, there is a need to determine the PID parameters by analyzing its pressure closed-loop simulation and performance, which based on the SISO Design Tool of MATLAB.
In this paper a linear parameter varying (LPV) statespace canal control model is obtained by identification in a local way. This LPV identification procedure is based on subspace methods for some operating points of an irrigation canal covering all the operation range. Different subspace algorithms have been used and compared. The model that best represents the canal behavior in a precise way is chosen...
SDSim is a novel solar dryer simulator based in a multi-crop, inclined multi-pass solar air heather with in-built thermal storage mathematical model. This model has been developed as a designing and developing tool used to study and forecast the behavior of the system model in order to improve its drying efficiency and achieving a return on the dryer investment. The main feature of this simulator...
Load simulator (LS) is a key equipment for rudder system in hardware-in-loop simulation experiment. In this paper, the present main research results of LS are reviewed. These methods are divided into four kinds based on their mechanism in suppressing “surplus torque/force” and their characteristics are analyzed. The mathematical model of electro-hydraulic load simulator is carried out and the source...
The research area of bio-inspired control methods for multi-legged robots and reptile robots has made significant development with the use of central pattern generators (CPGs) in recent years. However, there are still many problems to be solved to learn clearly the structure of CPG to adapt it to different applications. In this article, we use a method to configure CPG which makes the CPG have adaptive...
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