To improve the harvesting performance of bi-stable energy harvesters, this paper proposes a novel bi-stable piezoelectric energy harvester which consists of a piezoelectric cantilever beam with a tip magnet and a mova...
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To improve the harvesting performance of bi-stable energy harvesters, this paper proposes a novel bi-stable piezoelectric energy harvester which consists of a piezoelectric cantilever beam with a tip magnet and a movable magnet. The movable magnet connects to the base through a spring and is allowed to move along the spring compression direction. The nonlinear distributedparameters dimensionless mathematic model of the harvester is derived based on Hamilton's principle. The effects of excitation amplitude, excitation frequency, spring stiffness and Gaussian white noise on harvesting performance are analyzed by applying bifurcation diagram, phase trajectory, Poincare map and power output. The numerical simulations show that the proposed energy harvesting system reduces the potential barrier and makes the snap-through motion easier. It is demonstrated that the proposed energy harvester provides wider bandwidth and higher efficiency than the typical bi-stable energy harvester when subjected to low excitation amplitudes or low excitation frequencies.
In this paper,modeling and control of manipulator handling a flexible payload is considered under the parameter uncertainty and the unknown disturbance.A new sliding mode controller is proposed for manipulator handlin...
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In this paper,modeling and control of manipulator handling a flexible payload is considered under the parameter uncertainty and the unknown disturbance.A new sliding mode controller is proposed for manipulator handling a flexible payload based on a distributed-parameter dynamic model and hence is free from the so-called spillover instability,then extended to an adaptive scheme to cope with the upper bounds of the uncertainties were *** controllers are designed to realize system trajectory tracking performance and suppress the elastic *** sliding surface is designed as coupling the joint angle and angular velocity of link,as well as root strain and shear force of flexible *** of the system is proved by using Lyapunov *** simulations result provided to verify the effectiveness of the approach presented.
With the rapid development of high-speed railway technology, more and more countries enjoy the convenience which travels with high speed *** of the high speed train running on the railway use distributed power technol...
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With the rapid development of high-speed railway technology, more and more countries enjoy the convenience which travels with high speed *** of the high speed train running on the railway use distributed power technology, the converter on the train get power from traction network to supply the traction motorsIn the actual line,4-quadrant converter's(4QC) switching actions will inject harmonic into the traction network,while it may lead to the problem of the coupling resonance of the network when the harmonics match with the network's ***,in analysis of practical problems,it plays an important role if the model of the netwoek is accurateThis paper will analyze and have a comparation with the difference and accuracy of three different traction network modeling methods.
In this paper, a novel fault location algorithm is presented, which uses synchronized samples of two ends of the transmission line to obtain the voltages along the line based on precise integration method. The locatio...
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In this paper, a novel fault location algorithm is presented, which uses synchronized samples of two ends of the transmission line to obtain the voltages along the line based on precise integration method. The location of the fault point is yielded by voltage comparison. An example shows that This algorithm is simple, accurate and stable.
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