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This paper researches the electro hydraulic control system of two-column shield hydraulic supports, takes the hydraulic support base advancing loop as the position servo control system, and studies its dynamic characteristics. It establishes the power amplifier, position sensor, hydraulic cylinder and loading mathematical model of the position servo control system, determines the model parameters...
Compared with electromagnetic current transducer and electronic current transducer, fiber optic current transducer (FOCT) represents the developing direction of current transducer, which has a series of advantages, such as wide bandwidth, good insulation performance, high measuring accuracy, and so on. FOCT is one kind of new-type precise sensor based on the principle of Faraday magneto-optical phase...
By using the MOS energy band diagram and Negative Bias Temperature Instability (NBTI) degradation model, an equation of NBTI degradation with channel doping concentration has been derived. Meanwhile, a new NBTI inhibition method by using different doping concentration has been proposed. The quantitatively calculation and simulation results show that, with the proposed method, the NBTI inhibition rate...
This paper proposes a method based on a projected dynamic system solving optimal currents, which ensure the minimal operation loss of the motor, of control system for interior permanent magnet synchronous motor (IPMSM) for electric vehicle. First, the efficiency optimization of IPMSM is modeled as a nonlinear programmming problem with constraints. Then using variational theory and projected dynamic...
For realizing real-time efficiency optimization control of interior permanent-magnet synchronous motor (IPMSM), the optimal currents (OCs) need to be computed real-timely. This paper proposes a method based on the projected dynamic system to find the OCs. Firstly, the efficiency optimization of IPMSM was regarded as a constrained optimization problem. And then, the optimization problem is classified...
In recent years, the cellular formation is attended with the increasingly fierce market competition, diversification and personalization of product demand and delivery conditions. Many researchers have put forward cell reconfiguration to meet the different demand in each period, but they don't consider the product can be processed in different routes in the same period to decrease the reconfiguration...
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