Chaos Analysis on the Acceleration Control Signals of the Piezoelectric Actuators in the Stewart Platform

In order to effectively predict the sieving efficiency of a vibrating screen, experiments to investigate the sieving efficiency were carried out. Relation between sieving efficiency and other working parameters in a vibrating screen such as mesh aperture size, screen length, inclination angle, vibration amplitude, and vibration frequency was analyzed. Based on the experiments, least square support vector machine (LS-SVM) was established to predict the sieving efficiency, and adaptive genetic algorithm and cross-validation algorithm were used to optimize the parameters in LS-SVM. By the examination of testing points, the prediction performance of least square support vector machine is better than that of the existing formula and neural network, and its average relative error is only 4.2%.

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Intelligent Prediction of Sieving Efficiency in Vibrating Screens

Zhang

Gong

Yuan

et al. 2016

Shock and Vibration

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Synchronous Stability of Four Homodromy Vibrators in a Vibrating System with Double Resonant Types

Zhang

Wang

et al. 2018

Shock and Vibration

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This paper aims at studying the synchronous stability of four homodromy vibrators in subresonant and superresonant states. The motion differential equations are established firstly. The simplified form of analytical expressions is yielded, and the stability criterion of synchronous states satisfies Routh–Hurwitz criterion. The coupling dynamic characteristics of the system are analyzed in detail numerically, such as the maximum of coupling torque, coefficients of ability of synchronization and stability, and phase differences. Based on the ratio of operating frequencies to natural frequencies of the system, the resonant regions are divided into two areas: subresonant and superresonant. It is shown that the phase differences among four vibrators in the subresonant state are stabilized about zero, and exciting forces of four vibrators are positively superposed, while in the superresonant one, the phenomenon of the diversity of the nonlinear system occurs, i.e., two groups of synchronous and stable solutions of the phase differences (pi and pi/2) are found, and in this case, the exciting forces of four vibrators are counteracted, the rigid frame embodies no vibration, and the minimum of dynamic load transferring to foundation is realized. The correctness of theoretical results is verified by numerical characteristic analysis and simulations. This paper can provide a theoretical reference for designing a type of new high-frequency vibrating mill.

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Chaos Analysis on the Acceleration Control Signals of the Piezoelectric Actuators in the Stewart Platform

Cited by 2 publications

References 32 publications

Intelligent Prediction of Sieving Efficiency in Vibrating Screens

Intelligent Prediction of Sieving Efficiency in Vibrating Screens

Synchronous Stability of Four Homodromy Vibrators in a Vibrating System with Double Resonant Types

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