Advanced Materials Research Vols. 989-994

Abstract: The air-conditioning load is directly related to energy consumption of the car. Based on the characteristics and sources of the air-conditioning load of the car driven in four typical cities, this paper gives an analysis on the air-conditioning load using the steady-state heat transfer calculation method. The result indicates the regionalism design on the air-conditioning system for car is feasible and beneficial to save energy.

Abstract: According to the requirements for wheel hub assembly line, the structure and hydraulic system of carrying manipulator with six degrees of freedom (DOF) is designed. The working principle of the hydraulic system is analyzed. To minimize the output force of the hydraulic cylinder, a mathematical model of hydraulic cylinder output force and structural parameters is established. And then the manipulator structure is optimized based on Matlab software. The key components of the hydraulic system are selected. This research provides reference for design of similar hydraulic system of industrial robot.

Abstract: The asynchronous motor is converted to a model similar to DC motor to control through coordinate transformation, and adopt SPWM inverter circuit, the motor runs with load implements ideal speed and steady operation, providing appropriate speed for aerostatic guide way. Realize simulation of asynchronous motor variable frequency speed regulation system by simulink.

Abstract: CTC Express is the leading domestic company in delivery service and wants to improve their business efficiency by establishing lean management in the shop floor activities. Lean management is generally adopted by the manufacturing industries as a significant technique to reduce waste and operation costs. This paper investigates the continuous improvement through value stream mapping, begins with describing the current situation and proposes the future condition. Several improvements were implemented in the company such as the transformation of automation process, better result in visual control and standardization processes. The new proposed system has shown being able to reduce the works of loading/unloading and in the same time to increase the performance of material handling in each cycle time.

Abstract: Has the advantages of quick response of PMSM using the method of DTC, but will make the high torque and big magnetic flux linkage ripples. In order to solve this problem, using the fuzzy neural network hybrid system to replace the traditional hysteresis controller, Strong learning ability and fuzzy logic in handling uncertain information has the adaptive ability of neural network, the fuzzy neural network hybrid system to produce the expected voltage vector, the speed of a smooth transition of permanent magnet synchronous motor. The proposed method is validated by simulation under external disturbances in motor is very effective to reduce the ripple of torque and flux, the speed of the fast response and smooth transition.

Abstract: The series and parallel energy storage system based on super capacitors can quickly adjust a wide range of active and reactive power in two directions, which is a new way to improve the stability and power quality of new energy power generation system. In this paper, double converters structure is used to achieve the series and parallel compensation effect and their control strategies according to Instantaneous Power Theory. It is simulated in PSCAD that series and parallel energy storage system of super capacitor contribute to the impact on wind turbines power as environment conditions change. Simulation results show that the energy storage system can greatly improve the stability and power quality of grid-connected wind turbines.

Abstract: A cracked rotor-active magnetic bearings (AMB) system with the time-varying stiffness is modeled by a piecewise smooth system due to the breath of crack in a rotating shaft. The governing nonlinear equations of motion for the nonsmooth system are established and solved with the numerical method. The simulation results show that a grazing bifurcation, period-double bifurcation and chaotic motions exist in the response. These nonsmooth bifurcations can give rise to jumps between periodic motions, quasi-periodic motions and chaos.

Abstract: The EMAS of aircraft-pavement is a dedicated device that used to block aircraft overrunning the runway. To protect the safety of aircraft and passengers, the EMAS can safely arrest the overrun aircraft in an allowed distance and inertial load without injuring aircraft passengers and damaging aircraft. Combining with actual situation, this paper made statics and dynamics analysis under the action of the wheel of EMAS,and provides effective theoretical support for further research of EMAS of aircraft-pavement.

Abstract: The aerodynamic drags of different reference car models were investigated to calibrate the performance of the Automotive Wind Tunnel in Jilin University. The two kinds of reference models--MIRA and SAE reference car models were involved in this paper, considering the actual situation of the Automotive Wind Tunnel in Jilin University. The results of the research show that the Automotive Wind Tunnel in Jilin University can meet the demand for automotive wind tunnel tests and it can get the same performances as other wind tunnels have and reliable test data can be obtained in it.

Abstract: The boiler-turbine coordinated system is a very important process of a power generation unit. This paper takes 300MW power plant as the controlled object and conducts simulation study on its different kinds of load control modes under the environment of the MATLAB. The parameters of PID controller are optimized using signal constraint (S-C) module in Simulink toolbox. By analyzing the results of the simulation and comparing both the advantages and disadvantages of them, we can provide references for the choices of load control mode of power unit.