LSG70-150A1滑动水口机构的受力分析

基于弹性力学理论,运用三维建模软件Pro/E和有限元分析软件MSC.Marc对滑动水口进行建模、分析,并且找到了较好的压力中心位置,达到了延长滑动水口使用寿命和改良使用效果的目的。     

连铸机大包滑动水口一例故障分析与处理

根据连铸机大包滑动水口液压系统的工作原理,对大包滑动水口液压系统出现的一例典型故障进行了分析与诊断。     

故障树诊断法在滑动水口液压站的应用

该文结合钢厂中的滑动水口液压站,通过实例介绍了一种对液压设备进行故障诊断的一种分析诊断方法,分析了滑动水口液压站故障发生的原因、发生概率,为预测和诊断故障提供了依据。     

大包滑动水口液压回路设计及优化改进

大包滑动水口液压回路控制大包滑动水口的开闭,而大包滑动水口是连铸的关键设备之一.该文简要阐述了大包滑动水口的组成及工作原理,并详细介绍了根据工艺要求来设计的液压回路,现场实践证明,该回路能满足连铸生产的工艺要求,但考虑维护的方便性,又对回路进行了优化改进.     

介绍一种不应使用蓄能器的系统

1　前言笔者公司有一套用于调试钢包滑动水口滑板压紧力的液压系统。液压系统原理图及钢包滑动水口示意图如图1所示。1.液压缸　2.水口　3.钢包4.上滑板　5.下滑板　6.蓄能器　7.压力表图1　液压系统原理图及钢包滑动水口示意图液压缸1伸出,推动下滑板5向右移,滑动水口2打开,反之水口2关闭。由于液压缸负载与滑板的压紧力成正比,因此可通过压力表读数测出液压缸负载,最终得出滑板压紧力的大小。压紧力太大时,在钢包3盛有钢水的热状态下,水口2不能打开或关闭;压紧力太小时,滑板之间的密封性不好,钢水容易渗出,造成漏钢事故。根据生产工艺要求…     

液压油的污染控制

分析了液压油的污染对连铸机大包滑动水口液压系统的危害,并提出了相应的改进措施。     

连铸机大包滑动水口液压系统优化设计

该文从连铸机大包滑动水口液压系统的工作要求着手,对原液压系统存在的问题进行了分析,并提出了优化设计方案.     

日本钢包精炼炉滑动水口装置的研仿

本文着重介绍了对日本滑动水口装置的研仿与国产化。     

精炼钢包滑动水口的使用

介绍国内外两种滑动水口在生产实际中的使用情况和性能对比。     

多级柔性伸缩臂动力学建模分析与实验

针对多级柔性伸缩臂滑动耦合动力学问题,根据ADAMS柔性体建模理论,建立了一种基于虚拟样机的多级柔性伸缩臂动力学模型。利用三维建模软件,依托改装的轻型伸缩臂式起重机建立实体模型,利用有限元分析软件对各级伸缩臂建立有限元模型,生成模态中性文件导入ADAMS中建立动力学仿真模型。为了实现仿真过程与实际工作状态一致,保证仿真结果反映实际工况,在伸缩臂间分别添加滑移副约束和接触力约束建立动力学仿真模型,通过比较两种不同约束方式所产生的动力学响应,并通过实验验证,分析得出多级伸缩臂臂间滑块与臂节之间接触碰撞会影响伸缩臂作业平稳性和安全性。研究结果为多级柔性伸缩臂动力学建模分析和设计制造提供了参考依据。     

Moldflow在某塑件浇口设计中的应用

以某塑件为研究对象,首先,通过分析其结构特征,确定了2处浇口位置;然后,应用Moldflow软件对其注射成型过程进行模拟,通过对填充时间、注射压力、锁模力、熔接痕和气穴的比较,最终确定了浇口位置。Moldflow软件的分析结果可以用来指导实际生产,也可以用来减少试模次数,从而缩短生产周期,降低生产成本,提高生产率。     

Tribological behaviours of PA/UHMWPE blend under dry and lubricating condition

Dry-sliding and lubricated friction and wear behaviours of polyamide (PA) and ultra-high molecular weight polyethylene (UHMWPE) blend were studied using a pin-on-disc method (polymer pin sliding against a stainless steel disc) at room environment. The tribological performance of PA and UHMWPE were also investigated for the purpose of comparison. The worn surfaces were examined using a scanning electron microscope (SEM) and optical microscope. It was observed that PA specimen demonstrated highest friction coefficient, UHMWPE the lowest in both dry-sliding and lubricated sliding test. The friction of PA could be sufficiently decreased by blending with UHMWPE. Statistical analysis suggested the relationship between the wear volume loss and the sliding distance could be expressed by a linear model for dry-sliding, while a logarithmic model was determined for lubricated sliding. The difference in wear modes between both sliding series suggested that there was change in the mode of material removal process. The lower wear rate in lubricated sliding was attributed to the elastohydrodynamic or partial elastohydrodynamic lubrication through the development of a continuous lubricant film between the polymer and the counterface, while the high wear rate of the specimens, in dry-sliding test, was mainly caused by fatigue process due to the repeated action of tearing and crack-propagation.     

GATE TYPE SELECTION BASED ON FUZZY MAPPING

0 INTRODUCTION(Mould conceptual design is the most important phase of mould design. The main characteristic of this phase is a linear flow of design, with minimal number of iteration [1]. The decisions made during this phase are of high level and have a direct influence on performance of the mould and development costs. Within this phase there are many operations that have to be carried out, one of which is gate type selection. Although numerical simulation approach could be used to optim…     

排水泵站快速闸门与压缩空气的联合运用

针对排水泵站快速闸门在实际运用中出现的问题，提出减小门体下落阻力和闸门止水问题的改造方案，采用压缩空气技术配合快速闸门启闭的新方法，使带虹吸式出水流道的排水泵站在防洪排涝期间出现超驼冷水位时能够完成机组启动、事故停机，以及防止江水倒灌等技术任务。     

Flow-induced vibration and flow characteristics prediction for a sliding roller gate by two-dimensional unsteady CFD simulation

Numerical analysis on the flow induced vibration and flow characteristics in the water gate has been carried out by 2-dimensional unsteady CFD simulation when sea water flows into the port in the river. Effect of gate opening on the frequency and the mean velocity and the vortex shedding under the water gate were studied. The streamlines were compared for various gate openings. To get the frequency spectrum, Fourier transform should be performed. Spectral analysis of the excitation force signals permitted identification of the main characteristics of the interaction process. The results show that the sources of disturbed frequency are the vortex shedding from under the water gate. As the gate opening ratio increases, the predicted vibration frequency decreases. The bottom scouring occurs for large gate opening rather than smaller one. The unstable operation conditions can be estimated by using the CFD results and the Strouhal number results for various gate opening gaps.     

变滑动摩擦系数振子简谐激励Krylov-Bogoliubov 计算方法

研究了单自由度滑动摩擦系数随相对速度变化的干摩擦振动系统简谐激励响应计算问题，运用Krylov-Bogoliubov近似方法推导了相应的频响方程。通过一个数值例分析，考察了简化为理想干摩擦模型时带来的计算误差。     

Local inhomogeneity in gate hysteresis of carbon nanotube field-effect transistors investigated by scanning gate microscopy

Local nature of gate hysteresis in a carbon nanotube field-effect transistor (CNFET) was studied using scanning gate microscopy (SGM). A sequential set of SGM images of the CNFET fabricated on a SiO(2)/Si substrate was obtained at a low temperature under an ultra-high vacuum. Comparisons of the SGM images obtained at decreasing and increasing gate voltage steps revealed that the order of appearance of SGM defects could not be accounted for by a uniform distribution of hysteretic gate screening along the carbon nanotube (CNT) channel. It was concluded that the gate hysteresis in the CNFET had substantial local variations along the CNT. The local inhomogeneity in gate hysteresis was attributed to inhomogeneous distribution of screening charge traps or sources on the SiO(2) surface.     

滑动轴承动力学温度及压力分布规律研究

从系统动力学的角度出发分析了滑动轴承在运动状态下的内部温度变化规律和压力分布规律,建立了滑动轴承内部在系统动力学下的温度场模型和动态油膜压力分布模型,并对模型进行了数值仿真.仿真结果表明:滑动轴承在系统动力学状态下,其内部的温度分布规律是沿轴承套中心轴线方向,往外温度升高较快;动态油膜压力的大小与转子的位移有关,并且油膜压力在动力学状态下呈不对称分布,与轴承的摩擦磨损有着紧密的关系.这些工作对于进一步掌握滑动轴承内部在系统动力学下的温度和压力分布规律有一定的借鉴意义,为滑动轴承内部的动态摩擦磨损的研究提供了理论研究支撑.     

新型可洗井封隔器密封元件有限元分析

采用Mooney-Rivlin超弹性材料模型,进行封隔器坐封过程的有限元分析。研究橡胶材料参数的获得方法,采用有限滑动接触模型定义了胶筒与隔环、套管、中心管的接触。计算结果证明封隔器的结构改进设计是合理的。