Advanced Materials Research Vol. 645

Abstract: This paper analyzed parameter variation on pressure and flow of the test pump under condition of the load changed on hydraulic pump test-bed. Based on AMESim simulation software, a mathematical model of test bench loading system can be established. Then, the system loading characteristics has been analyzed, which provide theoretical basis for the further design on hydraulic pump type test bench system.

Abstract: The system is under the control of electro-hydraulic servo loop, and makes it possible to automatically adjust the valve in real time. It uses the accumulator as a power source of emergency cut-off to achieve cut-off of the valve. Based on AMESim, we established a mathematical model of the Emergency Cut-off Valve that can make a simulation analysis about the data of displacement, velocity, acceleration when it shut down. This study provides a theoretical basis to the analysis and design of Emergency Cut-off Valve.

Abstract: In order to research the mechanical response of asphalt pavement under horizontal load which produced by the large aircraft braking process, large-scale finite element software is used in this paper. The model of main landing gear load is established to analyze the change of principal mechanics indexes of airfield pavement when the aircraft has different landing distance. The results show that: the horizontal load has a significant influence on the normal stress of landing direction, but the influence area is concentrated in the rear of the wheel. The horizontal load has more effect on horizontal shear stress and longitudinal shear stress, while has less effect on tensile stress of surface layer bottom, tensile tress of base course bottom and transverse shear stress. The tensile stress of surface layer will increase significantly when the braking distance is less than 2000m. Meanwhile, thickening surface layer could decrease the tensile stress and increase the fatigue lifetime apparently.

Abstract: Establishing the system model of free beam vibration gyro under the influence of the Support structure, deriving and analyzing its vibration performance, comparison between model simulation through ANSYS software and relative theoretical calculation indicates that the relative error is less than 0.25%. Researches on the relations among system sensitivity, bandwidth, shock resistance and anti-interference ability of its model and sizes of Support structure contribute to principles of system optimization design and a set of design parameters: free beam (50mm×4.1mm×4.12mm), cylindrical Support structure(radius0.25mm×2.46mm), the performance of model is as: system driving frequency (8589.8HZ), bandwidth (39.4HZ), shock resistance (411.02g) and anti-interference frequency (above2381.3HZ).

Abstract: A new Roller Forks is put forward. And a novel rollers mechanism is used in the forks. As the key component of the forks, the main girder’s strength is studied in detail, including its stiffness, maximum stress and the corresponding minimal safety factor. The analysis results show that the girder meets the design requirement.

Abstract: Hankel integral transform and H.M.Westergaard are two common methods for solving the differential equation of elastic surface of airport rigid pavement slab. The influence of the pavement slab elastic modulus, the pavement slab thickness and the foundation reaction modulus to the two solving methods is studied in this paper. The results can be seen in the conclusion.

Abstract: A simplified dynamic model of the quadrotor is established. A multi-channel control scheme based on PID and dynamic inversion is proposed. Four channels are designed to achieve the position tracking and attitude stabilization of the quadrotor. A simulation shows the validity and good features of the control strategy.

Abstract: Crank-slider type cluster wells pumping unit is a new generation of energy efficient pumping unit whose structure is simple and it is safe to use. Crank torque is one of the key factors affecting the efficiency and efficiency of the pumping unit, which is closely related to its structural parameters. Using ADAMS mechanical system dynamics simulation software to build a virtual prototype of the slider-crank cluster wells pumping unit, taking which as a basis, carried out virtual test aiming to the length of the crank and connecting rod, which was two factors affecting the crank torque. The result of the study has a guiding significance to the structural design and optimization of slider-crank cluster wells pumping unit.

Abstract: According to the major design deficiency of the existing tank, the computational fluid dynamics (CFD) technique is adopted to simulate the flow field in the large quench tank, and two optimum schemes are brought forward. Further more, the influence of different mixer systems on the flow field in the large quench tank is analyzed. Simulation Results show that the non-uniform flow field is generated throughout the quenching zone in the existing large quench tank, and the flow rate of the quenchant is rather low, which may lead to the workpiece insufficient and non-uniform cooling rate. Setting an inner core in the center zone of the tank increases the flow rate in the region near the inner surface of workpiece. Using the submersible impellers, the flow of the quenchant in the region near the outer surface of workpiece significantly strengthened. There is parallel relation between the flux of the inner core and that of the submersible impeller.

Abstract: Using combustion theory to research on the technical theoretical features of oxygen-enriched combustion technology application to the cement industry kiln. On the basis of this, engineering projects of that, a certain enterprise 3000 t/d cement clinker production line applied oxygen-enriched combustion technology, and its economic evaluation were calculated. The results showed that: applying Oxygen-enriched combustion technology to the existing cement clinker calcined equipments, the coal powder consumption, the volume of flue gas and CO2 concentration in the flue gas of unit cement clinker occurred regular changes, When the O2 concentration increased from 21% to 30%, the coal powder consumption decreased by 17.78%, the flue gas volume was reduced by 12.73% and the CO2 concentration in the flue gas increased to 76.57%. If the enterprise used the oxygen-enriched atmosphere of O2 concentration for 30% to form the coal combustion, it can save coal about 71.87 t/d, equipment production capacity increase by 41.75% and capture CO2 products about 2662 t. Every year, this resulted in the profit increasing 103 million yuan.