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The aircraft braking is a complex dynamic and kinematic process, involving the brake wheel and runway status, loaded state and anti-skid control strategy and other aspects, including sophisticated uncertainties and nonlinear factors. This paper aiming at the nonlinear tire model with unknown parameters, combined with the empirical fitting slip rate coefficient curve based on the linear identification...
The virtual synchronous generator (VSG) is the interface between distribute generator and power grid, which has the inertia and damping characteristics of the synchronous generator. This strategy can effectively control influence of inverters on power grid. In order to reduce the circulating current and power oscillation, this paper proposed a pre-synchronization control strategy which adds the pre-synchronization...
According to the concept of electromagnetic aeroelastic energy harvesting system, two kinds of magnetic levitation-based electromagnetic energy conversion devices with different winding schemes are designed, and the flutter is simulated by the simple harmonic motion with given amplitude and frequency. The energy conversion capacity of this device was calculated and analyzed. The output voltage and...
According to the nonlinearity and uncertainty of the electro-hydraulic actuator (EHA) system, a feed-forward compensation variable structure control (VSC) algorithm based on disturbance observer (DO) is proposed, by setting the DO parameters, feed-forward compensation for the observed disturbance D(k) is performed. The controller switching function and control function are selected to design the variable...
A new aircraft Electro-Hydrostatic Actuator (EHA) of a certain model fighter was designed to meet the braking system under the Aircraft Anti-skid Braking System development background. The paper describes the principle and features of the EHA, and gives the specific requirements of the EHA. In this paper the selection and performance of the motor, pump and hydraulic cylinder were optimized. It focuses...
Based on the electromagnetic characteristics of switched reluctance machine (SRM) obtained by finite element method (FEM), two nonlinear mapping relations, namely i(ψ,θ) and T(i,θ), are modeled by BP neural network (BPNN) with Levenberg-Marquardt(LM) algorithm. On this basis, the dynamic simulation model of SRM based aircraft electric brake system (SRM-EBS) is built in Matlab. The performance of SRM-EBS...
With the background of the development of Aircraft Anti-skid Braking System, a new aircraft Electro-Hydrostatic Actuator (EHA) of a certain model fighter was designed to meet the need of the braking system. The paper described the principle of work and features of the EHA, gave the specific requirements of the system. The selection and performance of the motor, pump and hydraulic cylinder were optimized...
Aim. The full paper begins with the bad influence of the thermo-elastic instability (TEI) due to frictional heat energy at the rough sliding interfaces. The main shortcoming of existing literatures is, in our opinion, that it do not deduce theoretical mathematics model taken into account the rough surface profile with the heat convection and radiation boundary conditions in temperature field. We now...
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