Pengzhi Li

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The precise pressure control in common rail will directly influence the performance of common rail diesel engine, so it is very important to control it effectively. Because common rail pressure was nonlinear, time-variable and disturbed, it is difficult to realize accurate pressure control with traditional control methods. Conventional PID control can not(More)
In this paper, a novel Takagi-Sugeno (T-S) fuzzy-system-based model is proposed for hysteresis in piezoelectric actuators. The antecedent and consequent structures of the developed fuzzy hysteresis model (FHM) can be identified online through uniform partition approach and recursive least squares (RLS) algorithm, respectively. With respect to the controller(More)
In this paper, a new type of decoupled 2-DOF translational parallel micro-positioning stage is designed to realize the 2-DOF ultra-precision linear motion. The stage consists of two piezoelectric actuators (PZTs) and a monolithic compliant mechanism. The monolithic compliant mechanism adopts two types of compound double parallel four-leaf flexures and a(More)
In this paper, a novel Takagi-Sugeno (T-S) fuzzy system based model is proposed for hysteresis in piezoelectric actuators. The antecedent and consequent structures of the fuzzy hysteresis model (FHM) can be, respectively, identified on-line through uniform partition approach and recursive least squares (RLS) algorithm. With respect to controller design, the(More)
In this letter, the cause of vulnerability of the original pseudo-random sequence generator based on Chen chaotic system is analyzed, and the corresponding enhancement methods are proposed. Transient data produced by the calculation among fixed-point numbers is used to improve the performance of the original scheme. Statistical tests and security analysis(More)
To improve the phase-shifting accuracy, this paper presents a novel integrated framework for design, control and experimental validation of the piezoelectric actuated phase shifter with a trade-off between accuracy and cost. The piezoelectric actuators with built-in sensors are adopted to drive the double parallel four-bar linkage flexure hinge-based(More)
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