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A neural based variable structure controller (NVSC) is presented for a three dimensional (3-D) overhead crane system. The proposed NVSC scheme combines the principles of neural networks and variable structure systems to tune the free parameters and simplifies the design procedures. By efficiently computing of the control signals, this work drives the cart quickly to the assigned position; meanwhile,...
Active noise control utilizes the artificial noise to cancel the undesired noise. This technique generates the anti-noise signal with the same magnitude and 180°phase shift to the undesired noise, to destructively interfere the undesired noise. Many researchers have employed the FXLMS algorithm to design the ANC system because of its simplicity. However, the fluctuation of secondary path in FXLMS...
While two-dimensional (2-D) orthogonal variable spreading factor (OVSF) codes were proposed for multicarrier direct-sequence code-division multiple-access (MC/DS-CDMA) systems in order to eliminate multiple-access interference, the number of orthogonal sequences (or code cardinality) was restricted by the number of carrier frequencies. Non-orthogonal 2-D frequency-time-spreading (FTS) codes were then...
An enhanced adaptive sliding mode fuzzy approach is applied to control the position and load swing of a 3D overhead crane system. The merits of this method include the robustness and model free properties of the sliding mode and fuzzy logic controllers, respectively. An adaptable slope of sliding surface is presented and the chattering phenomenon of sliding mode control is also discussed to enhance...
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