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Fast switching fluid power valves set strict requirements on performance, size and energy efficiency and simulation models are therefore needed to obtain good designs of such components. The valve moving member is subject to fluid forces depending on the valve flow rate and movement of the valve member itself. These fluid forces may be accurately simulated using Computational Fluid Dynamics (CFD)...
This paper is concerned with the control of a hovercraft vessel using a fuzzy variable structure control theory. Firstly, we introduce the R/C hovercraft type vessel dynamics. Secondly, the fuzzy variable structure control (FVSC) is proposed in this paper. A significant feature is that the transient response during the reaching phase has been remarkably improved by the proposed control. To illustrate...
Hydraulic servo pump is extremely important to achieve high dynamic performance and large power density of distributed actuation systems in modern aircrafts. In this study, a piezo-hydraulic servo pump (PHSP) with multiple piezoelectric stacks (PZT stacks) is proposed. The key feature of this design is the development of a mutual active valve rectification method. Based on the novel rectification...
This paper presents a simple space vector modulation based direct thrust control (SVM-DTC) method for position control of a permanent magnet linear synchronous motor (PMLSM). The proposed SVM-DTC method has constant switching frequency and low flux and force ripple while maintaining advantages of conventional switching-table-based DTC (ST-DTC) such as elimination of current loops, excellent dynamic...
This paper is concerned with the control of a hovercraft vessel using a sliding mode fuzzy logic control and image-guided techniques. Firstly, we introduce the R/C hovercraft type vessel dynamics. Secondly, the sliding mode fuzzy logic control (SMFLC) is proposed in this paper. A significant feature is that the transient response during the reaching phase has been remarkably improved by the proposed...
Switched reluctance motor drive system becomes an attractive alternative in adjustable speed drive due to its simplicity in both motor construction and power converter, and vibration that resulting acoustic noise in switched reluctance motor have generated intense interest from the time it became commercially competitive with dc and ac drives. Focus on the magnetic noise vibration, dig the relationship...
In this paper, in order to suppress the force ripple of a permanent magnet linear synchronous motor (PMLSM) and ideally to access a constant velocity, a model reference adaptive sliding mode control (SMC) is proposed. The main goal is to reduce velocity variations in the presence of an oscillatory load, uncertainties and parameter variations. Therefore, the emphasis is put on robustness and vibration...
A new hybrid swing-up and stabilization controller (HSSC) for the inverted pendulum-cart system (IPCS) is proposed. The HSSC includes a fuzzy switching controller, a simple swing-up controller, and a fuzzy stabilization controller. The proposed HSSC can autonomously adapt its parameters according to the changes in the specification parameters of the IPCS without any need for an external adaptation...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
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