共查询到20条相似文献,搜索用时 62 毫秒
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为开发高效节能型挖掘机,提高能量的利用率,分析了现有挖掘机液压系统在节能控制方面存在的不足,提出1种基于恒压网络二次调节技术的挖掘机液压系统的设计方案,分析了该方案的特点.以具体挖掘机工况为例,对3种不同的挖掘机液压控制系统进行能耗分析与对比,结果表明基于恒压网络二次调节技术的挖掘机液压控制系统是可行的,且具有较好的节能效果. 相似文献
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液压变压器是液压恒压网络系统中一种压力转换元件,可以实现无节流损失地将液压恒压网路系统压力转换为负载所需的压力。剖析了液压变压器的工作原理,设计了电控斜轴柱塞式液压变压器的结构,建立了液压变压器的转矩、变压比、流量和平衡角共四个特性参数的数学模型,在液压恒压网络试验台上对所研制的电控斜轴柱塞式液压变压器进行了特性试验研究,结果表明其理论分析结果与试验结果是一致的。 相似文献
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0 INTRODUCTIONA sketch of a hydraulic drawing process isillustrated in Fig. l .The working liquid pressure inthe liquid chamber is the important parameter relateddirectly with the process.The key of a successfuldrawing is that hydraulic pressure-stroke characterist-ics can be designed properly and controlled availablyaccording to the different shapes of the products.l ESTABLISHING A PRESSURE-STROKE CHARACTERISTICIn hydraulic drawing process, the free defOrmat-ion zone is … 相似文献
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针对定压网络静液传动及其控制系统的特点,提出了对其使用静态神经网络及具有自适应学习率的反传学习算法进行控制,给出了有关的相应结果。 相似文献
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广义脉码调制液压伺服控制的研究 总被引:1,自引:1,他引:1
提出了广义脉码调制液压伺服控制,研究了用开关阀代替比例阀或伺服阀实现液压伺服控制的理论和方法。分析了开关阀控非对称液压缸伺服系统的动静态特性。为减少力负载对液压位置伺服控制精度的影响,设计了负载观测器;利用观测出来的等效负载进行反馈控制,抑制力负载干扰的影响,提高液压位置伺服控制的精度。 相似文献
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Wang Shaoping Jiao Zongxia Hua Qing Institute of Automation Science Electronic Enginearing Beijing University of Aeronautics Astronautics 《机械工程学报(英文版)》2001,(1):36-39
0 INTRODUCTIONHydraulicservoloadingsystemisacomplexsystem ,whichrunsimportantrolesinhardware in loopsimulationofflightvehicleonthe ground .Becausetheloadedobjectmoveswiththeloadingsystem ,theextraneoustorquewhichisresultfromtheloadedobjectmotionandparamet… 相似文献
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ZHANG Yanting WANG Qingfeng XIAO Qing FU Qiang State Key Laboratory of Fluid Power Transmission Control Zhejiang University Hangzhou China 《机械工程学报(英文版)》2006,19(4):505-508
Limitations of various accumulators in hybrid hydraulic excavator are analyzed. A program using capacitor as the accumulator based on constant work-point control is put forward. A simulating experimental system of hybrid construction machinery is established, and experimental study on constant work-point control for parallel hybrid system with capacitor accumulator is carried out using the pressure and flow rate derived from boom cylinder of hydraulic excavator in actual work as the simulating loads. A program of double work-point control is proposed and proved by further experiments. 相似文献
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FANG Yu YANG Jian CHAI Xiaodong 《机械工程学报(英文版)》2008,21(2):72-76
A robust control algorithm is proposed to focus on the non-linearity and variables of the hydraulic press machine with the proportional vatve. The proposed robust controller does not need to design stable compensator in advance, which is simple in design and has large scope of uncertainty applications. The feedback gains of the proposed robust controller are small, so it is easily implemented in engineering applications. The theoretical and experimental research on the position and speed control of the hydraulic press machine is carried out. The control requirements of the hydraulic press machine during the working process are met in the position and speed at the same time. Experimental results show that the proposed controller has better robustness subject to load variables and adaptability of parameter variations of the hydraulic press machine with the proportional valve. 相似文献
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负流量控制模型与试验研究 总被引:2,自引:0,他引:2
揭示了液压挖掘机负流量控制的节能机理是控制六通多路阀的旁路回油流量为小的恒定值,在此基础上建立了负流量控制系统的数学模型,并在自行研制的试验样机上用电液比例技术再现了挖掘机上的负流量控制,证明了模型的正确性,进一步阐明了这一模型的应用方向。 相似文献