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Boost-flyback converter can be regarded as a combination of boost and flyback circuit. The leakage inductance of the transformer serves as the energy inductance of boost converter. In this paper, a new strategy which applies boost-flyback topology to a photovoltaic micro-inverter is proposed. The working principle of boost-flyback is analyzed and a switching average model of boost-flyback is obtained...
Based on BP algorithm, a thermal management model of SOFC system used for marine underwater equipments was established, and linear prediction was performed on the model. Through repeated training on the convergence chamber, heat exchanger and stack respectively, appropriate parameters were selected to conduct testing on the trained model. The deviation between the test result and actual date can meet...
The demagnetization characteristics of the permanent magnet synchronous machine (PMSM) are investigated using the finite elements method. This is done to resolve the partial demagnetisation of the PMSM rotor, resulting from the short-circuited magnetic field of the first turn of the phase belt (FTPB). This paper first introduces the electrical machine design parameters and winding construction, after...
This paper proposes a switched sliding mode control (SSMC) method grounded on the switching control and the sliding mode control, which enhances the control performance by switching among appropriate sliding mode controllers according to different regions of the state space. The SSM simultaneously has the characteristic of global high-speed convergence compared with the nonsingular fast terminal sliding...
A design method of dynamic positioning (DP) nonlinear filter is proposed for surface vessels which are suffering from random disturbance. Extended Kalman filtering moving horizon estimation is applied to design a nonlinear filter in accordance with the discrete marine motion model which is transformed by the difference method. Arrival cost for moving horizon estimation is calculated via extended Kalman...
In this paper, an orbit control method for the rendezvous with the non-cooperative maneuvering target is proposed. In the near range guided phase of rendezvous and docking, the relative motion model is established firstly. Based on this relative motion model, an optimal control method before maneuvering and a sliding mode control method after maneuvering are introduced. This association method is...
In recent years, with the development of China's economy and the urban vehicles increased greatly, the intelligent parking system is developing rapidly all over the country. As the important part of an intelligent parking system, vehicles and the traffic volume detection technology is also in continuous developing. The practical and feasible infrared detection technology has been widely used in traffic...
TSP (Travelling Salesman Problem) is a typical issue of combinatorial optimization problem in the domain of mathematics, which aims at finding the shortest pathway among the given cities, and visit each city only once. This essay introduces an efficient way to solve TSP based on virtual instrument technology, combining the genetic algorithm and annealing algorithm. Because it takes the advantage of...
In this paper, adaptive block backstepping control has been investigated for the integrated missile guidance and autopilot with input constraints. The integrated guidance and control model for full states coupling design satisfies the so-called block low-triangular structure. Adaptive block backstepping control methodology is proposed for the MIMO time-varying nonlinear system with input saturation...
According to the characteristics of aviation engine starting process, this paper mainly analyzes state parameters of the starting process, and establishes its mathematical model. On the basis of using the SIMULINK to simulate aviation engine starting system, some fault conditions are tested to obtain fault data, and the principal component analysis (PCA) is used for data dimension reduction and to...
Dynamic target tracking technology has been widely used in airborne fire control systems, airborne warning systems, onboard systems and battlefield surveillance target tracking. The dynamic target tracking technology is used in automatic target detection, identification and positioning to control the movement of the camera. High-sensitivity CCD camera system is widely used in Modern high-speed camera...
A small biaxial swing platform with variable-length struts is introduced in this paper for swing test of light loads. Focusing on such struts, control circuit of swing platform is designed, the motion stability analyzed, and the patterns of motion of variable-length strut researched.
In power system of ships, electrical loads change more complex and wider than lands'. Voltage dip is one of the most serious problems of power system quality. The article researches many methods of detecting voltage dip, according to the specificity of power system in ships, αβ converter algorithm based on dq decomposition method was proposed in article. Pointing at the problem of phase delay, the...
A dual-mode predictive flexible rotor control method is proposed here for active magnetic bearings (AMBs) with input constraints. The method is then proved to be capable of maximizing the allowable operation region of the constrained rotor-AMB system. Finally, experiments on a thirty-six ordered benchmark rotor-AMB system are conducted to show the effectiveness and superiority of the proposed predictive...
A kind of satellite navigation transmission system based on DSP and Ethernet hardwired TCP/IP stack chip W5100 is designed to satisfy the long distance and abundant data transmission required in satellite navigation signal processing. The system is made up of central processor and a number of data processing units. Each processing unit collects and processes satellite navigation information under...
In multi-axis machining, the processing of curves and surfaces in the two-dimensional space and the three-dimensional space requires the coordinated motion of each axis, and the machining accuracy is determined by both the tracking error and the contouring error. Tacking and contouring accuracy resulting from not only the high performance controller of each axis to improve the tracking accuracy but...
This paper analyses the computing method of navigation coordinate system between vehicles and presents the calibration ways of coordinate conversion parameters. The conclusion is used for converging fire by group vehicles, or automatic fire distribution and overriding control over guns in other vehicles by the command and control system. So it can be used for fire command automation of vehicles.
The torque sensor is one of the core components used by emerging intelligent bicycles. A novel Lab VIEW-based automatic testing system for torque sensors is introduced in this article. Motor, magnetic powder brake, temperature & humidity chamber and other equipment are controlled by Lab VIEW. All these make the dynamic testing of temperature and voltage possible. On the basis of curve fitting,...
With the constant development of the building integrated photovoltaic distributed grid-connected generation system, the utilization ratio of photovoltaic facades in city's photovoltaic generation system has gradually become the focus of people's attention. To reduce energy loss in the process of increasing and inverting low voltage DC into high voltage AC as well as dropping into low voltage for low...
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