Search

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 on the motor structures and performances, with dual windings, which played a role as the power driver of EHA. The operation characteristics of the dual windings motor have investigated under different conditions. Finally, the paper provide modelling and analysis performance of EHA system and beyond a whole aircraft system.

In the process of power generation by hydrogen energy, the application of fuel cell has been used widely. As we all known, it often appears that the randomness of hydrogen, oxygen input and power output load, which puts forward higher requirements for the robust design of power converters. The power converter based on traditional sliding mode due to its discrete control law exist inevitable chattering phenomenon. In order to conquer the serious problem, this paper presents a novel avoidance chattering Flyback converter based on the super-twisting sliding modes. To remove the intermittent disturbance in the new energy power generation, especially in fuel cell system, this paper compare the effect of the converter controlled by super-twisting sliding mode controller with the classic PI controller in a Flyback converter as an example. The simulation results show that: Under the condition of large disturbances in input and output, the converter controlled by super-twisting sliding mode has stronger robustness.

Nonlinear system control has been widely concern of the research. At present, the nonlinear system decoupling control and static feedback linearization that based on the theory of differential geometry brought the research getting rid of limitation for local linearization and small scale motion. However, differential geometry control must depend on precise mathematical model. As a matter of fact, the control system usually is with parameters uncertainties and output disturbance. Considering sliding mode variable structure control with good robust, which was not sensitive for parameters perturbation and external disturbance, the combination idea of nonlinear system and sliding mode controls was obtained by reference to the large number of documents. Thus, it not only can improve system robustness but solve the difficulties problem of nonlinear sliding mode surface structure. As known to all, traditional sliding mode had a defect that is chattering phenomenon. A plenty of research papers focus on elimination/avoidance chattering by using different methods. By comparing, the chapter is concerned with novel design method for high order sliding mode control, which can eliminate chattering fundamentally. Especially, the approach and realization of nonlinear system high order sliding mode control is presented. High order sliding mode technique is the latest study. This chapter from the theory analysis to the simulation and experiment deeply study high order sliding mode control principle and its applications. The arbitrary order sliding mode controller is employed, whose relative degree can equal any values instead of one. In addition, the control systems design is very often to differentiate the variables. Through the derivation of sliding mode, the expression of sliding mode differential value is obtained. At the same time, the differentiator for arbitrary sliding mode is given to avoiding complex numerical calculation. It not only remains the precision of variables differential value, but also obtains the robustness. Due to its inherent advantages, the permanent magnet synchronous motor (PMSM) deserves attention and is the most used drive in machine tool servos and modern speed control applications. For improving performance, this chapter will apply nonlinear high order sliding mode research achievement to MIMO permanent magnet synchronous motor. It changes the coupling nonlinear PMSM to single input single output (SISO) linear