挖掘机臂液压系统的模型化参量估计-------外文翻译.doc
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挖掘机臂液压系统的模型化参量估计-------外文翻译,摘 要首先介绍了液压挖掘机的一个改装的电动液压的比例系统。根据负载独立流量分配（ ludv ）系统的原则和特点，以动臂液压系统为例并忽略液压缸中的油大量泄漏，建立一个力平衡方程和一个液压缸的连续性方程。基于电动液压的比例阀门的流体运动方程，测试的分析穿过阀门的压力的不同。结果显示压力的差异并不会改变负载，此时负载接近2...
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摘 要
首先介绍了液压挖掘机的一个改装的电动液压的比例系统。根据负载独立流量分配（ LUDV ）系统的原则和特点，以动臂液压系统为例并忽略液压缸中的油大量泄漏，建立一个力平衡方程和一个液压缸的连续性方程。基于电动液压的比例阀门的流体运动方程，测试的分析穿过阀门的压力的不同。结果显示压力的差异并不会改变负载，此时负载接近2.0MPa。然后假设穿过阀门的液压油与阀芯的位移成正比并且不受负载影响，提出了一个电液控制系统的简化模型。同时通过分析结构和承重的动臂装置，并将机械臂的力矩等效方程与旋转法、参数估计估计法结合起来建立了液压缸以等质量等为参数的受力平衡参数方程。最后用阶跃电流控制电液比例阀来测试动臂液压缸中液压油的阶跃响应。根据实验曲线，阀门的流量增益系数被确定为2.825×10-4m3/(s•A)，并验证了该模型。
关键词：挖掘机，电液比例系统，负载独立流量分配（ LUDV ）系统，建模，参
Abstract
A retrofitted electro-hydraulic proportional system for hydraulic excavator was introduced firstly. According to the principle and characteristic of load independent flow distribution (LUDV) system, taking boom hydraulic system as an example and ignoring the leakage of hydraulic cylinder and the mass of oil in it ,a force equilibrium equation and a continuous equation of hydraulic cylinder were set up. Based on the flow equation of electro-hydraulic proportional valve, the pressure passing through the valve and the difference pressure were tested and analyzed. The results show that the difference of pressure does not change with load and it approximates to 2.0MPa. And then, assume the flow across the valve id directly proportional to spool displacement and is not influenced by load, a simplified model of electro-hydraulic system was put forward. At the same time, by analyzing the structure and load-bearing of boom instrument, and combining moment equivalent equation of manipulator with rotating law, the estimation methods and equations for such parameters as equivalent mass and bearing force of hydraulic- cylinder were set up. Finally, the step response of flow of boom cylinder was tested when the electro-hydraulic proportional valve was controlled by the step current. Based on the experiment curve, the flow gain coefficient of valve unidentified as 2.825×10-4m3/(s•A) and the mode is verified.
首先介绍了液压挖掘机的一个改装的电动液压的比例系统。根据负载独立流量分配（ LUDV ）系统的原则和特点，以动臂液压系统为例并忽略液压缸中的油大量泄漏，建立一个力平衡方程和一个液压缸的连续性方程。基于电动液压的比例阀门的流体运动方程，测试的分析穿过阀门的压力的不同。结果显示压力的差异并不会改变负载，此时负载接近2.0MPa。然后假设穿过阀门的液压油与阀芯的位移成正比并且不受负载影响，提出了一个电液控制系统的简化模型。同时通过分析结构和承重的动臂装置，并将机械臂的力矩等效方程与旋转法、参数估计估计法结合起来建立了液压缸以等质量等为参数的受力平衡参数方程。最后用阶跃电流控制电液比例阀来测试动臂液压缸中液压油的阶跃响应。根据实验曲线，阀门的流量增益系数被确定为2.825×10-4m3/(s•A)，并验证了该模型。
关键词：挖掘机，电液比例系统，负载独立流量分配（ LUDV ）系统，建模，参
Abstract
A retrofitted electro-hydraulic proportional system for hydraulic excavator was introduced firstly. According to the principle and characteristic of load independent flow distribution (LUDV) system, taking boom hydraulic system as an example and ignoring the leakage of hydraulic cylinder and the mass of oil in it ,a force equilibrium equation and a continuous equation of hydraulic cylinder were set up. Based on the flow equation of electro-hydraulic proportional valve, the pressure passing through the valve and the difference pressure were tested and analyzed. The results show that the difference of pressure does not change with load and it approximates to 2.0MPa. And then, assume the flow across the valve id directly proportional to spool displacement and is not influenced by load, a simplified model of electro-hydraulic system was put forward. At the same time, by analyzing the structure and load-bearing of boom instrument, and combining moment equivalent equation of manipulator with rotating law, the estimation methods and equations for such parameters as equivalent mass and bearing force of hydraulic- cylinder were set up. Finally, the step response of flow of boom cylinder was tested when the electro-hydraulic proportional valve was controlled by the step current. Based on the experiment curve, the flow gain coefficient of valve unidentified as 2.825×10-4m3/(s•A) and the mode is verified.
