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There is a new type of hydraulic accumulator has been presented in this paper, and for the magnetorheological fluid(MRF) chamber of the new hydraulic accumulator, the modeling and the solving method for the fluid-solid interactions and magnetic- fluid interactions in the MRF chamber are provided and also studied by the finite element method. And also, using the ADINA software, the finite element network...
This paper presents and implements a method to detect actuator faults (loss of effectiveness) for a quadrotor unmanned helicopter (known as the Qball-X4) altitude control. Fault model is presented with the first principle physical modeling method. Mathematical model is further adjusted based on the grey-light-box scheme to adjust the model parameters and reduce model uncertainty of the Qball-X4. The...
This paper proposes and implements a proportional-integral-derivative (PID) structured fault tolerant controller. The fault tolerant controller is designed using linear quadratic (LQ) technique against the partial loss of control effectiveness due to the actuator fault. Compared with the conventional PID controller, the PID structure optimal controller has the ability to manipulate the multiple-input...
Analysis of breakdown mechanism in gas-insulated trigatron switches is important for the engineering design and function prediction. Based on the gas discharge theory, a physical model was proposed to estimate the breakdown time for gas-insulated trigatron switches. And the model can explain the breakdown in the trigatron switches with two modes of the breakdown mechanism, i.e., fast breakdown mode...
For quick realization of controller design and optimization of parameters in a project, avoiding the long-time and danger during debugging the project, a new co-simulation control method based on dSPACE and Siemens PID module FM355C was introduced. In this method the close-loop control system was set-up with the rapid control prototype method based on the dSPACE and its hardware environment, using...
The cryptosystem of elliptic curve has gained more and more researchers' attention from home and abroad in recent years as it owns a short key and a fine security. This paper elaborates the definition of elliptic curve which is used to establish cryptosystem and also makes some explanation to the realization of the Add Point Operation on the elliptic curve together with the fast Add Point Operation...
The cryptosystem of elliptic curve had been put forward by Miller and Koblitz solely in 1985. The cryptosystem of elliptic curve owns three special advantages in terms of recent research: 1. It has larger flexibility when it chooses groups; 2. There wouldn't be any effective sub-index arithmetic to attack it if the cryptosystem of elliptic curve is suitably chosen; 3. It has a short key. In this paper,...
This paper is concerned with H∞ output tracking control of networked control systems with packet disordering. Considering random and bounded delay and packet disordering, a mathematical model of networked control systems is proposed by introducing the receive index notion. Output tracking-based H∞ controller design method is presented in terms of linear matrix inequality (LMI) technology, which is...
Hydraulic transformer is a new hydraulic component. In order to decrease the hydraulic transformer's volume, uncover its working principle, and provide theoretical guidance for its practical application, here theoretical analysis and simulation research are carried out. On the basis of the analysis of the displacement of plate-inclined piston type hydraulic motor, the concept, distributor ports' displacements,...
Recently many countries have kept studying on the methods of constructing ultra speed networks. Task Force team for IEEE 802.3ah has accomplished the standardization of EPON which is the next generation subscriber access network. EPON doesn't still have the bandwidth wide enough to support the new service which demands high bandwidth. Therefore 10 G EPON is the next generation subscriber access network...
Measurement of cross-sectional area of spinal canal is always the research focus in medicine, so it has become more and more important to find an efficient and rational method. This paper proposes a new method, which uses coordinate axis rotation and projection transformation to measure the area. The advantages of this method are: transform the 3D measurement into 2D, reduces the computation complexity,...
This paper shows a strategy for the fuzzy logic control system using an offline simulated ball mill grinding approach. In this study, a step change in the force reference signal is considered a disturbance. The current study focuses on the design and implementation of a fuzzy logic control system for product flow rate of ball mill grinding process. The performance of the system is analyzed by simulating...
A new structure actuator for reducing coupling of bank-to-turn (BTT) missiles to is studied. The new structure actuator can roll independently along the longitudinal axis of the missile. Hence, the actuator instead of airframe needs to steer when controlling BTT missile rolling. So the rolling speed of main airframe is reduced, it can reduce coupling of missile introduced by airframe rolling. And...
This passage mainly in the study of grey vectors, how to solve the vector and vector function, as well as how to construct a vector between two gray fitting function relationship.
Based on the definition of absolute degree of grey incidence, which put forward by Professor Liu in 1992, a kind of new models for grey incidence analysis is given in this paper. The interrelations and influence can be measured by the new models with different visual angle of comparability and closeness respectively. And a simplified method to calculate the similitude degree of grey incidence and...
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