Applied Mechanics and Materials Vols. 325-326

Abstract: In order to convert the high pressure common rail system engine to CNG/Diesel dual fuel engine, an electronically controlled system is developed. The system includes a CNG fuel supply system, the CNG electronic control unit (ECU) and its matching harness etc. During starting and idle load conditions, the engine runs under pure diesel mode, when the speed and load reached a certain set point, the diesel ECU reduces the pilot diesel quantity, meanwhile, the CNG ECU increases the natural gas quantity, then the engine runs under dual fuel mode. The engine experiment data show that in different conditions, the highest substitution rate is 90% and the average substitution rate is 83%; the average savings ratio of operation cost per hour is 26%.

Abstract: Automatic open-parachute-device is an essential device in the field of aviation life-saving technology. In this paper, on the basic of the open-parachute-device mechanism, structure of its reliability function is given. According to its reliability indicators, considering the main failure mode and combining with similar products' reliability statistical data, analysis and design of reliability indicators are processed. Successively according to the principle of "redistribution method" and the principle of "proportional distribution method" about failure rate, the reliability indicators are calculated in detail. The results showed that the reliability indicators allocation with the "proportional distribution method" is little different from the reliability indicators allocation with the "redistribution method", but the former is more in line with the requirements. This design has a guiding significance to the product production.

Abstract: The electric boiler in use at present has a significant system inertia and a serious time-lag at the same time the difficulty of building the mathematical model. We often use PID algorithm of integral separation to improve the system. In this thesis, we put forward another PID algorithm of alteration in rate and take the example of the temperature control system of electric boiler. Then we use digital simulation of control system based on MATLAB to The method of fuzzy PID control is a ideal method.

Abstract: The electric boiler in use at present has a significant system inertia and a serious time-lag at the same time the difficulty of building the mathematical model. So it comes to a new method of combining them together. The parameters of K_p, K_i and K_d are adjust by fuzzy inference. Experimental results illustrate that the fuzzy PID parameters controller achieved the system performance index. The method of fuzzy PID control is a ideal method. The results show that the new controller is reliable, and shortens the time and volume of adjustment.

Abstract: In view of the fact that the performance of any conventional PID control can t meet the requirement an electric boiler temperature control system, this paper puts forward a kind of improved algorithm for tuning the PID parameters. an adaptive fuzzy controller with adjusting factor is proposed in this paper. Experimental results illustrate that the adaptive fuzzy PID controller achieved the system performance index. The method of adaptive fuzzy PID control is a ideal method.

Abstract: Research has been done aimed at the boiler's temperature control system, and available control scheme is put forward. Combining with the output response of control system, simulation research and the control regulation of fuzzy controller are done to analyse, after experiments for many times repeatedly, fuzzy control regulation is ensured. The simulation result indicates that control effect is ideal, which means this scheme is identified as ideal temperature control system scheme.

Abstract: The electric boiler in use at present has a significant system inertia and a serious time-lag at the same time the difficulty of building the mathematical model. In this paper, a study based on the electric boiler is presented to meet the demands of stable system, shorter regulating time and a small overshoot. When fuzzy control is used, regulating time and overshoot always can achieves the specification, but system cause steady-state error. So it comes to a new method of combining them together. The parameters of Kp, Ki and Kd are adjust by fuzzy inference. Experimental results illustrate that the fuzzy PID parameters controller achieved the system performance index. The method of fuzzy PID control is a ideal method.

Abstract: In allusion to the airdrome Electro Magnetic Interference (EMI),researched and designed the software and hardware technique methods on interference suppression for Measurement and control system based on PLC of airdrome power supply equipment.

Abstract: In this paper, an adaptive backstepping type design is proposed to control the complex nonlinear behavior of the wing rock phenomenon. This method, based on Lyapunov stability theory, can simultaneouslyachieve parameters identification and control.Finally numerical simulations are presented to justify the effectiveness of the proposed controller.

Abstract: Quadrotors are becoming very popular because of their potential to be applied in a large variety of missions. In order to increase their reliability when actuator faults are present a fault tolerant stabilizing controller is designed. The presented approach can handle multiple actuator faults without needing to identify them. The effectiveness of the controller is demonstrated by carrying out numerical simulations.