In order to solve problems associated with high heat production,high-energy consumption and low efficiency for the hydraulic system of the working device in a wrecker truck,a hydraulic energysaving system based on com...In order to solve problems associated with high heat production,high-energy consumption and low efficiency for the hydraulic system of the working device in a wrecker truck,a hydraulic energysaving system based on common pressure rail( CPR) is proposed. A hydraulic transformer is utilized to control the actuators by analyzing energy-consumption characteristics of valve controlled hydraulic system in a wrecker truck. By analyzing the energy-saving principle of a hydraulic energy-saving system,a relevant mathematical model is established. A comparison is performed between the energysaving hydraulic system and valve controlled hydraulic system in a wrecker truck within the same work period for operating efficiency and energy consumption. Results show that hydraulic energysaving system of the wrecker truck has better controlling performance and efficiency of about 18%higher than the valve controlled hydraulic system. Energy-saving ratio for total energy consumption in this system reaches 51. 46%,demonstrating energy-saving effect of the system.展开更多
In this paper,two lifting mechanism models with opposing placements,which use the same hydraulic hoist model and have the same angle of 50°,have been developed.The mechanical and hydraulic simulation models are e...In this paper,two lifting mechanism models with opposing placements,which use the same hydraulic hoist model and have the same angle of 50°,have been developed.The mechanical and hydraulic simulation models are established using MATLAB Simscape to analyze their kinetics and dynamics in the lifting and holding stages.The simulation findings are compared to the analytical calculation results in the steady state,and both methods show good agreement.In the early lifting stage,Model 1 produces greater force and discharges goods in the container faster than Model 2.Meanwhile,Model 2 reaches a higher force and ejects goods from the container cleaner than its counterpart at the end lifting stage.The established simulation models can consider the effects of dynamic loads due to inertial moments and forces generated during the system operation.It is crucial in studying,designing,and optimizing the structure of hydraulic-mechanical systems.展开更多
The BFC804 model caterpillar forest fire truck is suitable for preventition and fire fighting in forests with rough terrains. Its main features include amphibian ability, high speed, wide tracks to enable it to negoti...The BFC804 model caterpillar forest fire truck is suitable for preventition and fire fighting in forests with rough terrains. Its main features include amphibian ability, high speed, wide tracks to enable it to negotiate marshes, and a solid body which can withstand impacts. It has a flexible wheel-type hydraulic-pressure control mechanism and a powerful and durable four-phase, eight-cylinder diesel engine making it ideal for use in extremely hot and cold places. The truck boasts a strong fire—extinguishing system with a water tank and two pumps and spray guns which can also be used to spread chemicals.展开更多
臂架液压系统是混凝土泵车的重要组成部分,用于输送混凝土和布料,目前存在压损过大的问题。借助AMESim与Simcenter 3D Montion软件建立62 m泵车臂架虚拟样机模型,经实验验证该虚拟样机与实际系统具有90%以上的契合度。利用臂架虚拟样机...臂架液压系统是混凝土泵车的重要组成部分,用于输送混凝土和布料,目前存在压损过大的问题。借助AMESim与Simcenter 3D Montion软件建立62 m泵车臂架虚拟样机模型,经实验验证该虚拟样机与实际系统具有90%以上的契合度。利用臂架虚拟样机研究系统的动态特性,揭示系统的压力分布,分析系统压损过高的原因,可知主要压力损失集中在平衡阀与长液压管路,提出3种降低压损的方案。以臂架管路通径优化为例,进行仿真分析与优化,并通过实验验证了管路通径优化效果。由仿真和实验结果可知:五臂倒钩收回工况下,将臂架长管路通径由8 mm增大至10 mm,可使小腔侧管路压力损失降低50%,大腔侧管路压力损失降低60%,可有效降低系统压力。展开更多
基金Supported by the National Natural Science Foundation of China(No.51505289)Scientific Research Projects of Army(No.2014ZJ16,QT0703)
文摘In order to solve problems associated with high heat production,high-energy consumption and low efficiency for the hydraulic system of the working device in a wrecker truck,a hydraulic energysaving system based on common pressure rail( CPR) is proposed. A hydraulic transformer is utilized to control the actuators by analyzing energy-consumption characteristics of valve controlled hydraulic system in a wrecker truck. By analyzing the energy-saving principle of a hydraulic energy-saving system,a relevant mathematical model is established. A comparison is performed between the energysaving hydraulic system and valve controlled hydraulic system in a wrecker truck within the same work period for operating efficiency and energy consumption. Results show that hydraulic energysaving system of the wrecker truck has better controlling performance and efficiency of about 18%higher than the valve controlled hydraulic system. Energy-saving ratio for total energy consumption in this system reaches 51. 46%,demonstrating energy-saving effect of the system.
基金Ho Chi Minh City University of Technology(HCMUT)Vietnam National University Ho Chi Minh City(VNU-HCM)for supporting this study。
文摘In this paper,two lifting mechanism models with opposing placements,which use the same hydraulic hoist model and have the same angle of 50°,have been developed.The mechanical and hydraulic simulation models are established using MATLAB Simscape to analyze their kinetics and dynamics in the lifting and holding stages.The simulation findings are compared to the analytical calculation results in the steady state,and both methods show good agreement.In the early lifting stage,Model 1 produces greater force and discharges goods in the container faster than Model 2.Meanwhile,Model 2 reaches a higher force and ejects goods from the container cleaner than its counterpart at the end lifting stage.The established simulation models can consider the effects of dynamic loads due to inertial moments and forces generated during the system operation.It is crucial in studying,designing,and optimizing the structure of hydraulic-mechanical systems.
文摘The BFC804 model caterpillar forest fire truck is suitable for preventition and fire fighting in forests with rough terrains. Its main features include amphibian ability, high speed, wide tracks to enable it to negotiate marshes, and a solid body which can withstand impacts. It has a flexible wheel-type hydraulic-pressure control mechanism and a powerful and durable four-phase, eight-cylinder diesel engine making it ideal for use in extremely hot and cold places. The truck boasts a strong fire—extinguishing system with a water tank and two pumps and spray guns which can also be used to spread chemicals.
文摘考虑门架变形、轮胎刚度阻尼以及车体惯性质量等参数的影响,搭建了基于VL motion的纵向动力学模型,结合门架液压系统模型建立基于AMESim与VL motion的联合仿真分析平台,辨识负载高位抖动/晃动工况中惯性力矩的时变特征,根据零力矩点理论(Zero Moment Point,ZMP)分析了叉车纵向堆垛的稳定条件。针对叉车纵向堆垛过程中由于液压系统冲击引起的失稳问题,设计了一种组合式液压缓冲装置。仿真结果表明,由于组合式液压缓冲装置的节流与吸能作用,减轻了负载运动状态变化所引起的液压系统冲击问题,提高了叉车纵向堆垛稳定性。
