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In order to improve the reliability of the single area load frequency system, the problem of fault diagnosis of the single area load frequency control systems based on observer is studied. In this paper, the issues of fault detection and reconstruction for single area load frequency control systems with uncertainty and disturbance by designing adaptive sliding mode observer are considered. By constructing...
Like level-ground walking, biological experiments have shown that humans largely maintain compliant leg behavior during slope walking, which greatly reduces the mechanical cost of transportation. Nowadays biped robots are becoming more and more functional on irregular terrains, yet no theoretical model can describe explicitly the cause of the characteristic ground reaction force (GRF) patterns observed...
NHK has proposed a famous 3D audio system: 22.2 multi-channel system, but its loudspeakers are too many and are troublesome to put in home. Ando and Wang has proposed two simplification methods to reduce its channel number, but only 3D sound field at the central listening point can be recovered well by NHK 22.2 system and its simplified systems, the listening experience at a non central listening...
This paper proposes a general multichannel system reproduction method. Firstly, relative to original multichannel system, a general global model is build up by guaranteeing sound pressure and the direction of particle velocity at the receiving point constant, and making the square error of particle velocity magnitude at the receiving point as little as possible. Then the model is equivalent to a least...
The class of Pneumatically-driven Lower-pressure Soft Actuators (PLSA) is a popular research topic as it can be potentially used in the surgical robotic applications. One fundamental problem lying in the PLSA research is the lack of a generally validated model for the complex nonlinear dynamic behaviours. In this paper, a new coefficient-adaptive orthonormal basis function model structure is specifically...
Regarding the complementarity of particle swarm optimization (PSO) and differential evolution (DE) and the complementarity of different differential evolutionary modes of DE, hybrid PSODE with three populations based on multiple differential evolutionary models is proposed. The algorithm effectively combines PSO and DE of two different evolutionary modes, improving local and global optimization ability...
The sustained oscillation often appears in the induction motor (IM) systems with indirect field-oriented control (IFOC) and essentially caused by the unstable equilibrium points undergoing Hopf bifurcation. In order to stabilize these undesirable oscillations, a convenient time-delayed state feedback method is presented and its accomplishing process is indicated for a tested IM system in detail. It...
In this paper, the time-delayed feedback control method is introduced to stabilize unstable equilibrium points undergoing Hopf bifurcation for an induction motor (IM) drive system. Stability criterion of a nonlinear time-delayed system is first established, and then an effective procedure is shown how to stabilize the unstable equilibrium points by suitably select the feedback gain k and the time-delay...
In this paper, a method is presented and achieved to accurately determine Hopf bifurcation point for an induction motor (IM) drive system, and Hopf bifurcation diagram is showed to indicate evolvement of the equilibrium points from steady state to undergoing Hopf bifurcation and then achieving stabilization again. At last, the classical Floquet theory is applied to confirm the limit cyclepsilas stability.
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