连铸机结晶器液位控制系统的设计

为适应系统的抗干扰能力,设计了模糊PID控制器。采用涡流传感器、PLC 、工控机,数字电动缸及智能控制软件组成结晶器液位控制系统在断面为135 mm的中厚度板坯连铸机上进行了工业试验,控制精度≤±3 mm,达到了设计的控制效果。     

结晶器控制系统的设计及应用

介绍了连铸生产中结晶器液面检测与自动控制的方法,指出局限性,进行了重新设计,并投入使用,效果良好.     

板坯结晶器铜板改进

针对我厂连铸机结晶器铜板使用寿命短、制约拉速提高的问题,从铜板材质、水槽尺寸、镀层以及铜板厚度方面对铜板进行了改造,提高了铜板使用寿命,节约了成本,为连铸机拉速提高创造了条件。     

结晶器铜板温度计算

本文采用有限元法计算了结晶器铜板温度分布情况，给出了基本参数和单元划分方法。实践表明，计算结果基本符合实际情况。     

B＆R PP41操作控制面板在液压伺服自振式结晶器控制系统中的应用

介绍了以PP41操作控制面板为主搭建的液压伺服自振式结晶器控制系统的构成，及软件设计流程。     

结晶器三维温度场可视化系统实现

连铸漏钢是连铸生产工序的主要故障之一.目前,漏钢预报系统仅根据有限的温度采集数据随时间变化的二维曲线,操作人员无法了解采集点外区域的温度情况.本文主要介绍了三维温度场可视化系统的组成和实现方法.通过分析结晶器铜板的传热原理,建立热传导温度模型,确定边界条件.与实测温度值相比较,数值结果表明温度场模型的有效性.根据温度场模型的计算结果,用Microsoft Visual C+ + 6.0工具和有限元分析软件ANSYS开发了结晶器三维温度场可视化系统,作为漏钢预报的辅助判断手段和分析决策平台.     

管坯连铸机结晶器关键技术研究

对管坯连铸机结晶器中结晶器管、水导向套管、水外套钢管和足辊段等部分结构以及对材料的选择、部分参数的确定进行了论述。     

新型半连续铸造机控制系统的设计

结合新型铸造机性能的要求,介绍了新型半连续铸造机的结构、功能,根据实际出现的问题提出了解决措施.     

Natural frequencies of vibration of a class of solids composed of layers of isotropic materials

In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape.     

叶切面最大厚度数值计算与应用

以叶切面最大厚度的数值计算方法为基础,探讨叶切面最大厚度计算的计算机实现,介绍叶切面厚度数值计算法的应用实例.     

两种仪表功能合理性评述

本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当，影响了仪表的正常使用，制造厂和用户应关注这类问题。     

双丝杠驱动机构同步分析

介绍了双丝杠驱动机构工作原理,论述了双丝杠运动产生不同步的原因以及如何判定与解决同步问题。     

膨胀套导向机构的设计

通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即：增加导向机构。     

Method of implementation of the positive gradient of mechanical properties of triboengineering materials

Modern methods of implementation of the rule of positive gradient of mechanical properties are considered; this rule was formulated by I.V. Kragelskii and its application serves to minimize the friction and wear of solids. The given methods include the application of coatings with the method of finishing antifricton abrasion-free treatment; application of new metal-cladding lubricating materials; and creation of a nanostructural state of the surface iron nitride layer by nitriding steel with a positive gradient of hardness normal to the surface.     

我校工业设计教育改革初探

针对目前市场对工业设计人才的需求,本文论述了我校在工业设计教育方面的改革措施,着重介绍了我校工业设计教育在软件和硬件方面所进行的一系列的改革。     

某型号飞机起落架支柱减振筒内壁腐蚀原因分析

飞机起落架减振支柱在飞机起落和滑跑时,吸收撞击能量,对飞机安全起降的意义重大.减振筒是减振支柱中的重要部件,本文从工艺流程、理化分析、外场使用和腐蚀机理分析等方面,对减振支柱减振筒内壁的腐蚀原因及危害进行了综合分析,并提出了相应措施.     

一种涡旋压缩机径向随变机构的设计

详细介绍了运用随变原理设计的一种新型径向密封机构的结构特点,工作原理及主要参数的确定方法,该机构可补偿由于涡旋体加工精度不高而造成的功率损失,适用于涡旋压缩机的批量生产。     

Specific features of operation of electrostatic microgenerators of energy

Specific features of operation of one- and two-capacitor microelectromechanical converters (MEMC) of energy of mechanical microscopic vibrations into electric energy with a modulated electrode-gap magnitude and with allowance for the mutual influence of electrical and elastic forces are analyzed, and the characteristics of these two devices are compared. The main factors restricting the increase in MEMC power are demonstrated to be the effects of “collapsing” and the condition of conservation of positive rigidity of the system. Expressions for estimating the limiting MEMC parameters are derived. The possibility of electrical energy generation in the presence of “real“ sources of wide-spectrum microscopic vibrations is considered.