The structure and working principle of a two-cylinder four-stroke single-piston hydraulic free piston engine(HFPE) were introduced. The basic vibration equation of free piston assembly(FPA) was established based upon ...The structure and working principle of a two-cylinder four-stroke single-piston hydraulic free piston engine(HFPE) were introduced. The basic vibration equation of free piston assembly(FPA) was established based upon the energy conversion between the injected fuel and the friction together with the load. Both the theoretical and numerical results show that the vibration system of FPA is a nonlinear conservative autonomous system in one cycle. The FPA vibration is symmetric with constant amplitude when FPA is only driven by the compression pressure in the compression accumulator and that in the combustion chamber. When considering the friction and load, FPA could still achieve a stable vibration after a few cycles' adjustment whether the input energy is equal to the consumed energy or not. The vibration characteristics are different when FPA vibrates in the compression stroke and the expansion stroke, which is the unique feature of the single-piston HFPE.展开更多
以某“2018年北京市智能制造标杆企业(数字化车间)”为研究对象,通过对机器人技术、视觉技术、自动导引车(Automated Guided Vehicle,AGV)技术、射频识别(Radio Frequency Identification,RFID)技术等的应用探索,介绍各项自动化技术在...以某“2018年北京市智能制造标杆企业(数字化车间)”为研究对象,通过对机器人技术、视觉技术、自动导引车(Automated Guided Vehicle,AGV)技术、射频识别(Radio Frequency Identification,RFID)技术等的应用探索,介绍各项自动化技术在液压支架电液控制系统液压阀装配车间的应用。实践证明,各项自动化技术的应用在生产过程中起到了提质、增效、降本的效果,可为煤机制造和液压产品制造中的技术升级提供借鉴。展开更多
基金Project(51275451)supported by the National Natural Science Foundation of ChinaProject(51221004)supported by the Science Fund for Creative Research Groups of National Natural Science Foundation of China+1 种基金Project(2013CB035400)supported by the National Basic Research Program of ChinaProject(2011BAK03B09)supported by the National Key Technology R&D Program of China
文摘The structure and working principle of a two-cylinder four-stroke single-piston hydraulic free piston engine(HFPE) were introduced. The basic vibration equation of free piston assembly(FPA) was established based upon the energy conversion between the injected fuel and the friction together with the load. Both the theoretical and numerical results show that the vibration system of FPA is a nonlinear conservative autonomous system in one cycle. The FPA vibration is symmetric with constant amplitude when FPA is only driven by the compression pressure in the compression accumulator and that in the combustion chamber. When considering the friction and load, FPA could still achieve a stable vibration after a few cycles' adjustment whether the input energy is equal to the consumed energy or not. The vibration characteristics are different when FPA vibrates in the compression stroke and the expansion stroke, which is the unique feature of the single-piston HFPE.
文摘以某“2018年北京市智能制造标杆企业(数字化车间)”为研究对象,通过对机器人技术、视觉技术、自动导引车(Automated Guided Vehicle,AGV)技术、射频识别(Radio Frequency Identification,RFID)技术等的应用探索,介绍各项自动化技术在液压支架电液控制系统液压阀装配车间的应用。实践证明,各项自动化技术的应用在生产过程中起到了提质、增效、降本的效果,可为煤机制造和液压产品制造中的技术升级提供借鉴。
