Guo X.,Nanjing University of Aeronautics and Astronautics |
Tao J.,Nanjing University of Aeronautics and Astronautics |
Yuan Z.,Anhui Heli Co. |
Zhang L.,Nanjing University of Aeronautics and Astronautics |
Sun X.,Nanjing University of Aeronautics and Astronautics
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2012
Aluminum tube and TA1 tube were cladded by explosive welding. The morphology and phases of the bonding interface were studied by SEM and XRD, respectively. The bonding strength and the microhardness distribution of the transition region were measured. The axial compression test and the radial flattening test were also carried out. The results indicate that the linear and the wavy bonding interface coexist. Meanwhile, obvious element diffusion occurs in the interfacial zone. In addition, the bonding strength can get no less than the shear strength of Al. No separation happens after the compression test and flattening test, indicating that the clad tube has excellent bonding properties and can endure large plastic deformation.
Zhang K.,Hefei University of Technology |
Zhang K.,Anhui Heli Co. |
Chen J.,Hefei University of Technology
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015
A potential energy recovery system for electric forklift was proposed based on dual-source energy storage system and volumetric speed control, the mathematical model of energy recovery system and the mathematical model of potential energy recovery efficiency were given, fuzzy PI control system for motor speed control was designed, control strategy of potential energy recovery system was given. AMESim and MATLAB were used to analyse potential energy recovery system, then through experimental study the effectiveness of simulation model and the accuracy of simulation results were tested. The results show that control effect of fuzzy PI control system is superior to that of traditional PI controller and the control strategy can realize the potential energy efficient recycling, so the control purpose is achieved. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved.
Zhang F.,Anhui University |
Zhang G.-S.,Anhui University |
Guan Z.-P.,Anhui University |
Liu W.,Anhui Heli Co.
Zhuzao/Foundry | Year: 2013
There were serious sand penetration in the transmission housing of forklift produced by lost foam casting (LFC), and the defects concentrated in the positions such as flange, corner, recess, dead angle, etc. The defects were determined to be metal penetration after analyzing and the control measures were put forward. The defects of the sand penetration were greatly decreased by adjusting pouring temperature, coating thickness, sand degree of ramming, negative pressure, pouring rate, etc., which avoided the castings reject resulted from the sand penetration and improved the castings yield.
Zhang B.,Hefei University of Technology |
Dong Y.,Hefei University of Technology |
Hu F.,Hefei University of Technology |
Liu Z.,Hefei University of Technology |
Liu Z.,Anhui Heli Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2012
Based on the pump pressure, the forklift' working conditions can be divided into no-load, full load and half load. By calculating forklift's input features, output characteristics and traction features, shift schedule of three variable parameters (throttle position, speed and pressure of oil pump) were designed. The rapid control prototyping experiments based on dSPACE system were designed to verify the shift and actuator control strategy. On the basis of TCU and HILS system, the HILS experiments was carried on, which testified the effect of control strategy in real TCU. The test results show that TCU designed by using dSPACE can meet the performance requirements, improve development efficiency, providing a reference for the development of forklift automatic transmission control unit.
Cheng W.-L.,Anhui University of Science and Technology |
Xie K.,Anhui University of Science and Technology |
Shi W.-J.,Anhui Heli Co.
ASME 2012 3rd International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2012 | Year: 2012
Bio-oil, produced from biomass feedstock like rice hull, straw, wood flour and other biomass wastes by fast pyrolysis where the biomass feedstock is heated and pyrolized with a rapid rate and the pyrolysis gases produced are condensed rapidly, is an interesting potential alternative fuel oil. Cooling rate of the biomass pyrolysis gas is an important factor effecting the production of bio-oil. In order to speed up the cooling rate, the high temperature biomass pyrolysis gas is cooled and condensed by spray droplets of produced bio-oil with low temperature in this paper. It was assumed that the chemical reactions among the components of pyrolysis gas can be ignored, a theoretical model based on the classic film model and the Maxwell-Stefan equation was presented to simulate the heat and mass transfer characteristics of the spray condensation of biomass pyrolysis gas. The effects of the initial pyrolysis gas temperatures, the initial bio-oil droplets temperatures and diameters, and the flow ration of the gas and the liquid droplets on the heat and mass transfer between the gas and the liquid droplets were analyzed by the model. Copyright © 2012 by ASME.