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RISS 인기검색어
- 검색키워드
- 저자 : Enzhe Song (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Enzhe Song,Noor Sattar Ibrahim Albakirat,Naeim Farouk Mohammed 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12
An efficient controller based on joint between original proportional-integral-derivative (PID) controller and fast genetic algorithm (FGA) is proposed to enhance the transient response of high order synchronous machine. PID controller has several advantages in practical design of synchronous machine compared with another controller。The transient response parameters with PID controller of synchronous machine are reasonable, but they susceptible to the local minima problem and not adequate. Therefore, FGA is used to overcome this problem and to enhance the transient response. Performance of the proposed controller is tested through a high order synchronous machine model and then compared with the original PID controller. In this paper the weak coupling relationship between the automatic voltage controller (AVR) and automatic generation control (AGC) in the synchronous machine has been proved to simplify the overall model. The results demonstrate that, the proposed controller is an efficiency and better than a conventional PID controller.
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Analysis upon fuel injection quantity variation of common rail system for diesel engines
Liyun Fan,Yun Bai,Xiuzhen Ma,Enzhe Song 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7
Fuel injection quantity variation of common rail system has effect on the stability and reliability of diesel engines. For purpose of investigating the influence rule and mechanism of fuel injection quantity variation caused by parameters, taking account of the influence of fuel physical properties on dynamic injection characteristics of the system, a bond graph model of common rail injector has been proposed based on bond graph methodology and the state equations of the system are obtained. Comparisons between calculated fuel injection quantities by the numerical model and experimental measurements at different rail pressures and injection pulse widths indicate that the developed model can reasonably predict the fuel injection quantity characteristic of the system. Fuel injection quantity variation characteristics caused by the parameters of common rail injector have been analyzed in entire operating conditions. The selected parameters are delivery chamber diameter, needle seat semi-angle, needle cone semi-angle, ball valve seat semi-angle, nozzle hole diameter, inlet orifice diameter and outlet orifice diameter. The variation rules of quantitative percentages are obtained by quantitative analysis upon fuel injection quantity variation influential factors. It is concluded that ball valve seat semi-angle, nozzle hole diameter, inlet orifice diameter and outlet orifice diameter have the most significant effect on fuel injection quantity variation, and the followed are delivery chamber diameter and needle seat semi-angle. In addition, needle cone semi-angle also results in the variation of fuel injection quantity, but the effect is insignificant.
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Peng Liu,Liyun Fan,Wei Zhou,Xiuzhen Ma,Enzhe Song 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.8
High-speed electromagnetic actuator (HEA) is the key component of Electronic fuel injection system (EFIS) of diesel engine, its dynamic performances have a significant impact on the control accuracy and flexible control law of fuel injection. In order to obtain the higher dynamic response speed, lower power consumption, higher safety and reliability, a novel HEA with permanent magnet (NPMHEA) was proposed based on the principle of parallel magnetic circuit in this paper. Then the simulation models of HEA coupling of magnetic field, electric circuit and mechanical motion were developed by the method of time-stepping finite element, and their precisions were verified by experiment. By the comparative analysis, influence rules of key parameters on the dynamic performances of HEA have been established. In addition, the multi-objective optimization of NPMHEA based on response surface methodology and Genetic algorithm (GA) was carried out and the Pareto optimal solution set was obtained. It is concluded that there are contradictions between objectives for the Pareto optimal solutions; considering the whole performances, the optimal solution is determined for which the peak current, the peak pulse and the hold current reduce by 20.5 %, 7.8 % and 43.9 %, respectively, and the actuation response speed quickens by 11.9 %, significantly reducing the power consumption and coil loss and improving the dynamic response speed of HEA. It decisively provides certain theoretical guidance for the design and optimization of HEA.
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