Applied Mechanics and Materials Vol. 575

Abstract: Considering the limitation of the existing method of engine controller’s development, a method to establish a virtual test system of engine controller was proposed. Firstly, a virtual engine controller was developed in ETAS INTECRIO environment and a vehicle system was developed in Matlab/Simulink environment, they composed a closed loop system. Then the system was validated by compared the simulation results of the virtual test system with the vehicle test results and the hardware-in-the-loop simulation results. The comparison results show that the system established by this method could satisfy the test requirement in the early controller development stage. This system has the advantage of higher convenience and lower cost and can significantly improve the efficiency of the engine controller development.

Abstract: For magnetic bearing system with characteristics of zero damping, negative stiffness and nonlinearity, this paper put forward a method of inverse control based on the fuzzy inverse model. The fuzzy system with fuzzifier and defuzzifier was used as an interpolator to approximate the inverse model of magnetic bearing. Then we connected the fuzzy inverse model in series with the magnetic bearing system to form a generalized pseudo linear plant, and selected a PID controller to control the pseudo linear plant. The fuzzy inverse model and the PID controller together formed an inverse controller to implement the closed-loop inverse control of the system. The simulation results demonstrate that the inverse control can reduce the overshoot, shorten the settling time, and make the rotor levitate in a larger range.

Abstract: This paper presents and analyses a performance comparison between a Linear Quadratic Regulator (LQR) and Composite Nonlinear Feedback (CNF) controllers for an active anti-roll bar (ARB) system. The anti-roll bar system has to balance the trade-off involving ride comfort and handling performance. The basic vehicle dynamic modelling with four degree of freedom (DOF) on half car model is proposed. The design model is validity and the performances of roll angle and roll rate under control of LQR and CNF controller are achieved by using simulation analysis. Both two controllers are modeled in MATLAB/SIMULINK environment. It has to be determined which control strategy delivers better performance with respect to roll angle and the roll rate of half vehicle body to achieve this goal. The result shows, the CNF LQR fusion control strategy improve the performance compared to LQR and CNF control strategy.

Abstract: Automated storage and retrieval warehouse systems (ASRS) have been implemented in industrial for few decades. This kind of combination of project has become common in current industry field. Refer to Pa. Pittsburgh, the enhancement of ASRS has helped to improve optimal stock capacity in limited space and minimize process flow time. The purpose of this project is to design a hardware prototype that can fulfill the concept of ASRS and can be implemented at electronic components store that requires store management. This is to improve the process in stock checking and also store or retrieve item. Furthermore, there have several major parts that can be considered to use this hardware such as method of store and retrieve, storage structure, movement of the machine and machine travelling system. The timing belt system is implemented on this hardware for performing linear X-Y-Z motions. Besides, the concept of pallets supported rack had been implemented in storage structure design. Last but not least, the concept of an automated guided machine travels to the desired location on rack is selected as a store and retrieve method for this hardware.

Abstract: The ejector performances were studied through simulation of solar thermosiphon injection refrigeration system. The influences of operating and structure parameters were analyzed on the eje-ctor performance. Some conclusions had been drawn: the optimum outlet and working pressure were 4241~5622Pa and 57803~70110Pa, the optimum ejector throat area ratio was 6.25, the ejector of 10 mm nozzle separation had maximum entrainment ratio and injecting flow. The influences of shock were analyzed on the ejector. The more shock number of nozzle exit, shock stagnation of the mixed chamber exit and the reflux of conical mixed chamber made the ejector performance decreased.

Abstract: This paper proposes a new control strategy to ensure the steering wheel and front wheel synchronization in Steer-by-Wire (SBW) using a Composite Nonlinear Feedback (CNF) controller. CNF is a combination of linear and non-linear feedback control laws. This controller is designed in order to minimize the delay in settling time, achieve fast rising time and lower the overshoot for the front wheel response. A simulation based on this control strategy was made and compared to analyze the system performance.

Abstract: Laser polishing is a finishing process based on melting material, with the objective of improving surface topography. Some operating parameters must be taken into consideration, such as laser power, feed rate, offset, and overlapping. Moreover, because of its dependence on the primary process, the initial topography has also an impact on the final result. This study describes a quadratic model, conceived to optimize final topography according to the primary process and laser polishing. Based on an experimental matrix, the model takes into account both laser operating parameters and the initial topography, in order to predict polished surfaces and to determine optimal set of parameters. After the phase of experimentation and the creation of the quadratic model, an optimal final topography is introduced, taking into account the initial surface and the laser parameters.

Abstract: This paper introduce a control system of automobile driving simulator, Using the CPLD (Complex Programmable Logic Device) technology can easily achieve detect the states of ignition equipment, steering equipment, clutch equipment, foot-brake equipment, hand-brake equipment, accelerator equipment, shift equipment etc and drive the instrumentation.

Abstract: With increasing air traffic flow, air traffic control system of Chinese to ensure aviation safety is facing new challenges. Without air space enlargement, air traffic is more and more crowded, to prevent aircraft collided with the aircraft, to prevent the aircraft and ground obstructions, ensuring air traffic is an important issue China civil aviation, and it is also the main task of ATC system. In this paper, based on the research and design of the airport PBN flight procedures, according to the operation of the program, the problem of poor runway CDA, approach procedure was optimized using the fusion point program approach, the ATSAB direction, improve the operation effect of CDA.

Abstract: In conventional steering system, during the parking maneuver, driver required large turned on the steering wheel to move the fornt tyre. Thus, it will increase the driver burden when turned the steering wheel. The feature of variable steering ratio (VSR), help to reduce driver burden. Moreover, it improves the vehicle maneuver at lower and high speed. This paper, proposed a control algorithm of variable steering ratio (VSR) in vehicle SBW system. The concept of hyperbolic tangent is used where it not only improved the maneuverability at lower speed, but also reduces the driver burden on the steering wheel. To investigate the effectiveness of the proposed VSR algorithm, the result is compared with conventional steering system