共查询到20条相似文献，搜索用时 406 毫秒
1.
制作动画进行演示是提高课堂教学质量普遍采用的方法,液压系统或元件由于存在油液的流动,在通用的三维设计软件中制作动画有一定的困难。利用三维设计软件Pro/E建模并制作出液压系统工作原理动画,以机床工作台液压系统和电液换向阀为例,详细介绍了分别使用该软件的动画环境和机构环境制作液压油液动画的方法。 相似文献
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史召峰 《辽宁科技学院学报》2016,18(2):6-8
液压换向阀是液压系统中的重要基础元件之一,由于其工作压力高,换向时往往造成巨大的冲击.元件之间的互相碰撞,由于其作用时间短,对产品的工作性能造成巨大的影响.主要通过ANSYS对阀芯与阀盖之间的碰撞进行建模仿真与计算,分析了阀盖的静态和瞬态应力特性,为液压阀的设计提供参考. 相似文献
3.
针对传统液压控制的缺点,选用电液比例阀对液压缸的位置进行控制,通过对电液伺服位置控制系统的组成的分析,对整个电液伺服位置控制系统进行建模,同时通过计算写出比例电磁阀的传递函数、PID控制的传递函数、比例放大环节的传递函数、反馈环节的产地函数以及阀控缸一负载环节的传递函数,进而得到了系统的开环传递函数.通过simulink强大的仿真功能,采用试凑法和仿真效果相结合的方法确定了PID的参数,取得了良好地系统仿真效果,系统能够稳定在一个固定值. 相似文献
4.
针对传统液压油缸控制伺服系统模型的复杂可变性、系统参数不确定性和时变性等，设计一种基于Simcenter Amesim-Matlab联合仿真的电液位置伺服系统仿真模拟实验。以常规液压缸为实验设计对象，利用Matlab与Simcenter AMESim软件对电液伺服系统的模型辨识方法进行设计；基于相关传递函数，进行滑膜变结构控制器设计；将其应用到特定的变载荷条件下的恒速电液位置伺服系统实验仿真。仿真结果表明，该方法具有良好的实用性与有效性。该模拟实验仿真的开展可加深学生对电液位置伺服系统理论知识的理解，提升学生的综合运用能力。 相似文献
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液压冲击机械在各行各业中迅速推广应用,合理匹配液压冲击机械的输出参数--冲击能和冲击频率的重要性日益突出.由于传统冲击器受配流方式限制,工作参数的调节有着相当的局限性.在此提出一种基于强制配流方式的新型冲击器系统.新型变频式冲击器结合变频电动机调速或变频液压控制技术,通过换向转阀达到配油换向,通过改变电动机或油马达转速达到调节活塞冲击频率;同时对该冲击系统进行了仿真,仿真结果表明该系统符合实际情况,为该冲击器的设计理论提供了基本依据. 相似文献
8.
目前我国注塑机液压系统多以电液开关PQ阀控制定量泵控制系统作为动力源,相对传统系统有一定的优点,但不够节能;现用电液比例径向柱塞泵控制系统做动力源,经过功率键合图建模和SIMULINK仿真,结果表明,可节能30%~40%. 相似文献
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本文针对某企业折弯机液压驱动系统运用电液比例技术进行改造,分析当前折弯机技术现状及折弯机数控技术的快速发展局面,分析常见液压同步传动方案,结合工程实际需要,对数控折弯机液压驱动系统进行设计。 相似文献
10.
《实验室研究与探索》2017,(6):151-155
基于原有QCS014A实验台开发了电液比例阀实验系统,在充分利用现有设备硬件基础上进行硬件补充和软件编制。该系统运用LabVIEW软件编写系统人机界面,通过串口实现人机界面和PLC通信,设定的控制参数通过PLC实现电磁阀通断和比例阀的阀芯位置控制,PLC同时采集压力流量等信号反馈给人机界面,经过相应处理,界面实时显示实验结果波形和比例阀性能指标。该比例阀实验系统可以进行电液比例换向阀、电液比例流量阀、电液比例溢流阀性能测试,实现比例阀的稳态控制特性、稳态负载特性、动态特性曲线测量。同时,为了加深学生对比例阀运用的了解,系统还可进行双缸同步实验,通过PID控制实现双缸精确同步。借此系统,开设了比例阀的性能测试和双缸同步实验,取得了良好实验效果。 相似文献
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This paper reports results of research on the stability of a hydraulic servo position system using generalization pulse code
modulation (GPCM) and common on/off valves for hydraulic servo control. The describing function was first used to analyze
the system's stability, and based on the nonlinear theory, an equation calculating the minimum orifice area of GPCM valves
was derived by applying results of analysis on the stability of the GPCM control system. In the end, aimed at developing a
hydraulic servo position system to be used in a paint robot, simulation and experiment were carried out. The results show
that the theoretical conclusions accorded with practical results.
Project (59805016) supported by NSFC. 相似文献
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This paper has introduced the developments of water hydraulic axial piston equipments.According to the effects of physicochemical properties of water on water hydraulic components,a novel valve plate for water hydraulic axial motor has been put forward,whose moment exerted by the fluid field between valve plate and bearing plate is balanced entirely.The material screening experiment of valve plate is done on the test rig.Through numerical simulation the effects of some geometry parameters on the performance of water hydraulic motor have been studied.The silencing grooves on the valve plate in water hydraulic motor can reduce the pressure shock and the occurrence of cavitation effectively.It is evident that the appropriate structure should change the wear status between matching paris and reduces the wear and specific pressure of the matching pairs.The specimen with the new type valve plate is used in a tool system. 相似文献
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单向阀结构简单，性能稳定，被广泛地用于液压系统中，起着其他控制阀不可替代的作用。单向阀还可与其他控制阀组成复合阀，也被广泛地用于液压系统中。 相似文献
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分析了液压阀汽蚀产生的原因以及给液压阀带来的影响;给出了防止汽蚀破坏液压阀的方法,以延长液压阀的使用寿命,保证液压阀的可靠性. 相似文献
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The weighing system designed for large structure object is mainly composed of three parts. The part of hydraulic system is made up of hydraulic cylinders, high pressure hydraulic hoses and electric pumps; the part of computer controlling system comprises pressure sensors, displacement sensors, data acquisitions, RS 485 network and the computer controlling model; the part of loading system is composed of the fulcrum structure and the concrete girder. The measurement principle and composition of the weighing system are discussed in this paper. Credibility and security of the weighing system are fully considered during the design phase. The hydraulic system is controlled by pilot operated check valves in case of the sudden loss of system pressure. The states of all gauges and RS485 network are monitored by computer controlling system functioning in different modules. When the system is running incorrectly, it will be switched to manual mode and give alarm. The finite element method is employed to analyze fulcrum structure so that the system has enough intensity to be lifted. Hence the reliability of the whole system is enhanced. 相似文献
16.
陈垚 《商洛师范专科学校学报》2014,(2):13-16
对液压系统参数变化影响电网进行了分析,采用单设备实验测检与系统配电仿真相结合的方式,设计了航空液压系统用电仿真模型,并在SIMULINK下搭建模型进行仿真。该模型通过单设备实验测试获得参数曲线,避免了理论建模时由于条件假设产生的误差,使仿真结果更接近实际情况。该仿真方法不仅提高了仿真速度,还简化了系统模型,仿真结果与实验结果近似,具有工程应用前景。 相似文献
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张庭祥 《山西广播电视大学学报》2013,(2):57-60
压力控制阀是液压系统中重要的 控制元件,作为压力控制阀的三种主要元件：溢流阀、减压阀、顺序阀,从其正作原理、性能结构、外形差异、不同的功能以及在工程实际中的选择和调节等方面分析归纳。对三种压力阀的异同之处进行研究辨析。为学生学习本课程和以后在实际工作中提供重要的参考依据。 相似文献
18.
巴川 《河北能源职业技术学院学报》2007,7(3):77-77,80
本文结合开滦集团吕家坨矿业分公司洗煤厂末煤分选系统机电安装工程施工现场实践，对液压阀件的日常维护工作进行进一步研究，对实施过程中的一些具体问题进行了分析，总结了液压系统日常维护的经验。 相似文献
19.
This paper presents a method to calibrate pipe roughness coefficient (i.e., Manning n-factor) with genetic algorithm (GA) under multiple loading conditions. Due to the old pipe age as well as deleting valves and blends in the skeleton of distribution network, most of the pipes in hydraulic model of practical water distribution system (WDS) are rough. The commonly used Hazen-Williams C-factor is therefore replaced by Manning n-factor in calibrating WDS hydraulic model. Adjustment to GA is designed, and the program efficiency is improved. A case study shows that the adjustment can save 60% of the total runtime. About 90% of the relative differences between simulated and observed pressures at monitoring locations are lower than 3%, which suggests that the proposed adjustment to the calibration is efficient and effective. 相似文献
20.
With the analysis on regulating system in 200 MW steam turbine, the necessity of appending the fast-opening function to the original system is set forth and a new type of fast-opening mechanism is devised. The mathematical model of system is built up. With the use of AMESIM software, the displacement curve of the piston, the force curve of the cartridge valve spool, the pressure curve and the flux curve in the regulation process are obtained based on simulation. The performances of three fast-opening systems composed of cartridge valves with different diameters are compared. Based on the analysis on factors that affect the execution time of fast-opening, the dead zone of the fast-opening system is put forward. To overcome the defect, different operation modes are adopted for different zones. The result shows that with the increase of the valve diameter, the regulating time in the dead zone significantly exceeds the fast-opening time in the whole journey. Accordingly, the optimization operation tactic in the dead zone and the qualification conditions are brought forward. The fast-opening system composed of 32 mm cartridge valves is taken as an example with use of the tactic. The simulation result shows that the maximum regulating time is shortened by 509 ms. 相似文献