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Pan Z.,Central South University | He Q.,Sunward Intelligent Equipment Co.
Engineering Failure Analysis | Year: 2015

Some cracks were found out on the oil pan and its strength reserve was reduced when one type of piston aviation kerosene engine was tested, so the high cycle fatigue analysis for oil pan was conducted. 3D model of the oil pan was established to analyze its force situation during the engine operation. The force situation of main bearings and bolts which was also put as boundary conditions when the ANSYS software was used in transient analysis for oil pan that was affected by alternation stress was obtained by GT-POWER and experiments, furthermore the fatigue safety factor of oil pan was calculated. The results showed that high cycle fatigue would occur around main bearings and the fatigue safety factor was under 1.2 when insert bearing caps were used by oil pan, while when the insert bearing caps were substituted with new ones the problem would disappear and the fatigue safety factor exceeded 2.0, which effectively improved the fatigue durability of oil pan. The bottom of the bolt head was mainly affected by compressive stress instead of alternating stress, so the high cycle fatigue around this area were not accounted for. © 2014 Elsevier Ltd. Source

Pan Z.,Central South University | He Q.,Central South University | He Q.,Sunward Intelligent Equipment Co. | Zhang X.,Central South University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2014

In order to investigate the high altitude performance of aircraft piston engines under composite supercharging conditions, the GT-POWER model of a composite supercharged system used on a certain aircraft piston engine was established to analyze its altitude characteristics under different supercharging conditions and its accuracy was validated. Based on the simulation results, it was concluded that when the engine was merely under level-one turbocharging condition, compared with the working condition on the ground, its maximum pressure in cylinder declined by 26 percent and the after-burning phenomenon became severe when it was operated at 5 000 meters above ground. In addition, the temperature in cylinder rose, resulting in apparent increase of thermal load, which ultimately leaded to power decrease of the engine. However, if the engine worked under composite supercharging condition, the pressure and power of the engine would recover in the high altitude, and the temperature in the cylinder approached to the level of ground working condition. When the engine was applied to a certain light aircraft, it could still maintain 80 percent of power even at the height of 7 600 meters, which verified that the composite supercharged system can satisfy the demand of high-altitude flight perfectly. ©, 2014, Editorial Board of Journal of HEU. All right reserved. Source

Pan Z.,Central South University | He Q.,Central South University | He Q.,Sunward Intelligent Equipment Co. | Deng Y.,Central South University
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015

By establishing mechanics-mathematical model of wrist pin bore installed in aero-piston kerosene engines, the force created by thread connection position between piston crown and piston skirt was analyzed. Under the condition of temperature, thermal stress and mechanical stress coupling, the deformation of the wrist pin hole was analyzed by using ANSYS software. The important point temperatures of combustion chamber and piston skirt after changing thread position were simulated and measured. The results show that deformation decreases 50 μm after changing thread position, and that the wear and tear condition of the wrist pin is improved. The combustion efficiency is not changed, but the center of combustion chamber rises a little under the condition of multi-field coupling. © 2015, Central South University of Technology. All right reserved. Source

Sunward Intelligent Equipment Co. | Date: 2011-11-30

An energy-recovery generation system for a handling and carrying electric vehicle, comprising a hoisting cylinder (

Gong J.,Central South University | He Q.,Central South University | Zhang D.,Sunward Intelligent Equipment Co. | Zhang Y.,Sunward Intelligent Equipment Co. | And 3 more authors.
2012 IEEE International Conference on Mechatronics and Automation, ICMA 2012 | Year: 2012

In order to enhance fuel economy of hybrid excavator system, a control strategy based on equivalent fuel consumption is introduced. Efficiency of motor and ultra-capacitor is converted to fuel consumption of engine, which is used to establish the equivalent fuel consumption function of the whole system and further to optimize the power distribution. A compensation function is introduced to ensure the ultra-capacitor working in the safe state of charge (SOC) by the way of modifying the result of optimization. A simulation is performed and the results show that the control strategy based on equivalent fuel consumption can effectively optimize the power distribution and improve fuel economy while the SOC of ultra-capacitor is maintained at reasonable range. © 2012 IEEE. Source

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