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为了解决水下生产配套装置线性覆盖工具输出的液压推力过小不能完全打开水下采油树阀门的问题,根据水下生产配套装置线性覆盖工具的运动特点,设计一套液压系统。通过Simulink/SimHydraulics模块构建线性覆盖工具中主活塞缸液压系统仿真模型,并对该系统进行仿真研究。仿真结果表明:线性覆盖工具主活塞缸在打开水下采油树阀门的工作状态下活塞杆运动平稳、无杆腔压力稳定,能够完全打开采油树阀门。通过与现场试验结果对比分析,该液压系统的各项仿真数据与实验结果基本吻合,证明了该液压系统具有合理性与可行性,同时也说明了该液压系统符合设计要求。 相似文献
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研制了一套用于水下高压局部干式自动焊接试验控制系统。此试验系统采用液压作为动力源,可在由排水罩形成的局部干式空间内进行MIG焊接。此系统采用西门子PLC、压力传感器、行程开关、水下摆心传感器等作为其主要的控制部件。由焊接环境控制、液压驱动自动焊机控制和水下摄像三套子系统构成。此系统可以实现在高压有水环境下远程遥控的局部干式自动焊接。结果表明,此焊接试验装置工作稳定,水下焊接焊缝质量良好。这些研究工作为核电厂水下焊接维修奠定基础。 相似文献
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165 MN自由锻造油压机的液压控制系统 总被引:1,自引:1,他引:1
自主研制了超大型自由锻造设备--165MN油泵直接传动自由锻造油压机.给出了该压机的主机结构型式及主要技术参数,比较了液压机的液压控制类型,并就其液压控制型式、油泵直接传动系统的技术难点、控制系统中动力系统、主控系统、低压充液系统、外控系统和循环系统等作了深入的分析和研究. 相似文献
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The stability fields of various sulfide phases that form on Fe-Cr, Fe-Ni, Ni-Cr, and Fe-Cr-Ni alloys have been developed as a function of temperature and the partial pressure of sulfur. The calculated stability fields in the ternary A-B-S system are displayed on plots of log
vs. the conjugate extensive variable (nA/nA–nB), which provides a better framework for following the sulfidation of Fe-Cr-Ni alloys at high temperatures. Experimental and estimated thermodynamic data were used in developing the sulfur potential diagrams. Current models and correlations were employed to estimate the unknown thermodynamic behavior of solid solutions of sulfides and to supplement the incomplete phase-diagram data of geophysical literature. These constructed stability field diagrams are in excellent agreement with the sulfide phases and compositions determined experimentally during the sulfidation of SAE 310 stainless steel. The sulfur potential plots appear to be very useful in predicting and correlating the sulfidation of commercial alloys.Nomenclature
a
i
Activity of componenti
- G
0
Standard Gibb's free energy change
- G
M
Integral molar free energy of mixing
- G
i
0
Partial molar free energy of mixing of componenti
- H
Standard enthalpy change
- H
i
Partial molar enthalpy (heat) of mixing of componenti
- H
M
Integral molar enthalpy (heat) of mixing
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K
Equilibrium constant
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n
i
Moles of componenti
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p
s
2
Partial pressure of diatomic sulfur
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R
Gas constant
- S
i
Partial molar entropy of mixing of componenti
- S
M
Integral molar entropy of mixing
- S
0
Standard entropy change
-
T orK
Absolute temperature
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X
i
Mole fraction of componenti
- i
Activity coefficient of componenti
- i
Relative chemical potential of componenti 相似文献
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JIANG Guochang ZHANG Xiaobing XU Kuangdi Shanghai University of Technology Shanghai China 《金属学报(英文版)》1992,5(12):476-482
Expressing the excess partial molar free energies and integral excess free energy as poly-nome of the composition,then the parameters in the expression of excess partial molarfree energy of C were evaluated based on:the excess partial free energy of C in C-Fe bi-nary alloy:the integral excess free energy of Fe-X binary alloy:the C saturation curveand the iso-activity curve of C (α_c=0.025) in the ternary system.Then the activitycoefficient of X was evaluated with the so-called “I-D” method,by which the componentactivities of every element in the whole molten ternary alloy can be evaluated,and theresults are in good agreement with literature data based on experiment. 相似文献
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介绍了锌沸腾焙烧专家系统的结构与功能,锌沸腾焙烧的专家知识与推理,重点分析了该专家系统的主要特点,包括改造的黑板系统、动态数据交换、数学模型以及多任务机制等。该系统应用于现场的实际生产,取得了良好的效果 相似文献
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张君艳 《锻压装备与制造技术》2017,52(5)
针对液压机的液压回路控制部分进行了PLC控制系统改造,给出了PLC的输入输出地址表、PLC接线图以及软件程序,调试运行后,不仅提高了其保压控制性能,而且大大提高了系统的可靠性、稳定性和生产效率。 相似文献