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In this paper, a current-feed resonant two-switch forward DC-DC Transformer (DCX) is proposed for high-efficiency and high-density unregulated bus converter applications. With a resonant capacitor in series with the leakage inductance of the transformer, ZCS turn-on and nearly ZCS turn-off can be achieved for the primary switches and there is no body diode and reverse recovery losses in the SR. Meanwhile,...
Drain drainage design and calculation program is to conduct a series of work on the basis of completion of network routing design and calculation. There are some differences in design method between water pipes and storm sewer drainage system. The program is a bit different, but a large number of constraint condition and control methods are basically the same.
In order to improve the guidance precision of the ballistic missile interception, the target's trajectory prediction and the impact point prediction solution algorithm for interceptor's mid-course guidance are studied. Firstly, in allusion to the drawbacks of current ballistic missile's trajectory predication, the high precision ballistic missile prediction algorithms based on predictor-corrector...
To improve the performance of the missile interceptors against modern air-defense threats such as ballistic missiles, a new integrated missile guidance and control with sliding mode differentiator and neural network algorithm is proposed in this paper. The three dimensional target and missile relative kinematics are firstly established based on which the zeroing line-of-sight (LOS) angular velocity...
In this paper, a new adaptive controller for a quadrotor unmanned aerial vehicle (UAV) is presented via Immersion and Invariance (I&I) approach. The quadrotor's dynamic model is subjected to some uncertain parameters such as the inertial moments, aerodynamic damping coefficients and so on. In particular, the mass-eccentric effects by the payloads are also considered. Despite all these uncertainties...
In this paper a nonlinear attitude tracking control scheme is developed for a small-scaled unmanned helicopter under input constraints. Via the analysis of the properties associated with the helicopter's rotor dynamics, the elevator servo input, the aileron servo input, and the rudder servo input are chosen to be the control inputs to be designed. Their constraints in amplitude under hovering flight...
Performance-based contracting (PBL), as a novel approach, is replacing traditional service procurement practices. In this paper, we set up a closed-loop support system for repairable parts with an M/M/m/N queuing service facility and a spare parts warehouse. We derived the steady-state probability of inventory levels in warehouse and the performance measures of the support system. Under the performance-based...
Based on the chaos anti-control theory, a new Lorenz hyper chaotic system family is proposed by adding a linear controller to the three dimensional autonomous Lorenz system family in this paper. It has been verified that the systems in the newly proposed family have the possibility of hyper chaos by analyzing their symmetry, dissipation, the stability of their equilibrium points, as well as the Lyapunov...
The subthreshold circuit is a promising ultra-low-power solution for such applications that don't require high speed but are extremely power-stringent. The characteristic of the current under subthreshold voltage is different from the normal domain. A delay model is essential to predict the performance, analyze the variation impacts and optimize the design. This paper proposes a fast computable delay...
A research method of the throttle aperture when annular slice deformation is presented. The flow equation of aperture under the turbulence state is deduced using the boundary layer theory. The equivalent relation of the flow is deduced according to the system structure which is designed by independence. The flow coefficient of controllable valve is solved by least squares method under the different...
The function of reactive power optimization (RPO)is to realize the reactive power of the electric fence and optimal control of voltage in order that the whole network's operation level can be improved and the loss of operation of power network can be reduced. Recently, the research of ORP is mainly focus on the handling of non-liner function and discrete variables and the convergence of the algorithm,...
It makes a brief description of the forms and main parameters of the β Stirling engine with the rhombic drive mechanism. The paper makes a deep analysis and found mathematical models on the cycle performance of β Stirling engine, illustrates the mathematical relationship among the power, pressure, working fluid volume, temperature and efficiency. It makes an experimental prototype design which through...
After many years of silence, virtualization recently became a hot topic once again, especially in the field of system dependability. Current researches mostly focus on more technical methods without taking into account the problem of how to verify the dependability of these technics. This paper proposes a Markov model to describe virtualization systems and gives the solving methods to quantitatively...
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