液压系统的改造设计研究

对冷床上卸钢系统和四辊轧机开卷机液压系统存在的问题进行了分析,找出了产生问题的原因,并对原液压系统进行了改造,经改造后的系统,减少了油液的泄漏,提高了系统的稳定性,减小了维修强度,降低了维修成本,提高了系统的工作效率.     

优化算法在汽车动态称重信号处理中的改进和简化

本文讨论了几种动态称重信号去噪的算法,分析了各种算法的优缺点,对其中的优化算法进行了改进,摒弃了繁杂的模型参数估计并结合平均算法,从而简化了处理过程.在实际测试中,取得了很好的效果.     

基于直线电机驱动的复合传动增压装置

介绍了一种新型的基于直线电机驱动的复合传动增压装置,对系统的工作原理进行了分析,并给出了工作原理图,对系统的输出流量与输出力进行了分析计算,给出了相应的计算式.该装置实现了液压油的封闭式循环,减轻了油液对环境的污染,技术功能较为完善,工作效率显著提高.     

抽油机的发展及抽油模式的改进

简述了抽油机的发展历程,分析了各阶段抽油机的特点及存在的问题.同时结合现阶段油田生产的特点,分析了节能抽油机的发展趋势.从一个新的角度分析了抽油机节能改进的方向.提出了"一机双井"的工作模式,做了简单的定性分析.     

一维精密转动定位平台的分析与设计

基于柔顺机构设计了一种新型的一维精密转动定位平台.首先建立了平台的数学分析模型,在此基础上,通过优化设计得到了平台的最优尺寸.利用有限元软件验证了理论建模和优化结果的正确性.制造了原型样机,进行了实验研究,对平台进行了标定,并分析了平台的定位误差.     

网络化制造环境下企业信息管理系统设计与实现

网络化制造是企业为快速响应市场需求和提高竞争力的一种先进制造模式.以某大型半导体封装企业的信息管理系统需求为基础,分析了在网络化制造环境下企业急需解决的问题,提出了设计目标,建立了功能模型,设计了系统结构,给出了实现技术.该系统较好地解决了企业信息管理方面存在的问题,提高了企业的竞争力.     

关节型模块化机器人构型及运动学研究

分析了模块化机器人模块划分与重构的关系,总结了模块的划分原则。对关节型机器人进行了模块化分,建立了含有五种单元模块的模块库,并对其可实现构型进行了拓扑分析。提出了一种新的坐标系建立方法,基于旋量理论和指数积公式推导出了每个单元模块的变换矩阵,得出了适用于关节型机器人构型变化的正运动学方程。最后通过实例验证了拓扑构型分析及运动学算法的正确性。     

虚拟设计在柴油机VE型分配泵中的应用

介绍了VE型分配泵的结构特点和性能优势,探讨了虚拟设计在VE型分配泵中的应用.对VE泵传动系统中各关键零部件(传动主轴、十字块、端面凸轮等)进行了应力响应分析和模态分析,并对研究结果进行了验证.介绍了虚拟装配技术的必要性,给出了VE型分配泵虚拟装配的爆炸效果图.找出了VE型分配泵各传动件断裂的原因.为结构设计的改进提供了依据,在企业的实际应用中取得了理想的效果.     

基于组件的车间级质量信息管理的技术研究与系统实现

针对某企业车间质量管理的功能需求,分析了集成环境下车间级的产品质量管理功能模型,建立了基于组件技术的质量管理系统结构框架,开发了网络环境下车间级的生产质量管理系统,实现了车间内质量数据信息的共享和对产品质量的有效控制,提高了车间生产效率,降低了生产成本,还与车间管理系统中其他系统实现了集成,同时组件模块化的设计方式为系统各模块的后续开发维护提供了方便.     

中频加热弯管机及其PLC控制

介绍了一种由液压驱动、可编程控制器控制的中频加热液压弯管机.该文对其工作原理、液压系统以及PLC控制系统等方面进行了介绍,并阐述了该机的性能特点.控制系统采用了可编程控制器和人机界面,提高了系统的可靠性及其柔性,增强了机床的抗干扰能力.     

CURING PROCESS OF PHOTOPOLYMER RESIN BOND DIAMOND TOOLS

Analytical simulation and corresponding proof-test are adopted to study the principle of the curing process of photopolymer resin diamond tools. The influence of the diamond as abrasives in photopolymer resin owing to the absorptivity of the diamond for the UV light on the photopolymer resin curing process is discussed. Based on the above, a kind of diamond tool—dicing blade is selected to analyze the curing process of photopolymer bond diamond tools. An analytical model of curing process is developed and a correlation curve between the depth of polymerization of the photopolymer resin diamond tools and the exposure time to represent the curing process of photopolymer bond dicing blade. A test is done to proof-test the validity of the analytical model and the correlation curve. The simulated data fit the experimental results, which demonstrates the analytical models and numerical algorithm are of high reliability. The analytical simulation method could possibly be used to optimize the curing cycle and improve the quality of the photopolymers resin bond diamond tools.     

Effects of prebuckling deformations on the elastic flexural-torsional buckling of laterally fixed arches

The effect of the prebuckling in-plane deformations on the elastic flexural-torsional buckling of laterally fixed circular arches is studied in this paper. The finite strains and the energy equation for the flexural-torsional buckling of arches have been derived based on an accurate orthogonal rotation matrix. A closed form solution for the elastic flexural-torsional buckling resistance of laterally fixed arches in uniform bending, including the effects of the prebuckling deformations, is obtained. It is found that the notion that the prebuckling deformations increase the flexural-torsional buckling moment of an arch or of a beam is not necessarily correct for a laterally fixed arch or beam in uniform bending, in deference to a laterally pinned arch. When a laterally fixed arch is subjected to positive uniform bending, the effects of the prebuckling deformations decrease the buckling moment, and the reduction of the buckling moment increases with an increase of the included angle and of the out-of-plane slenderness ratio of the arch. When a laterally fixed arch is subjected to negative uniform bending, the effects of the prebuckling deformations decrease the absolute value of its buckling moment when the included angle is very small, but increase the absolute value of the buckling moment when the included angle exceeds a certain value. The increase in the absolute value of the buckling moment increases with an increase of the included angle and of the out-of-plane slenderness ratio of the arch. When the ratio of the out-of-plane to the in-plane second moments of area of the cross-section is not small, both the reduction of the buckling moment of a laterally fixed arch in positive uniform bending and the increase of the buckling moment of a laterally fixed arch in negative uniform bending, are substantial.     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

滚筒采煤机负载的波动性分析

为了寻求滚筒采煤机正常工作时自身产生振动与冲击的原因,经过对滚筒上截齿受到的截割阻力与牵引阻力以及该两力在采煤机的牵引方向和竖直方向分力进行分析,得知两分力大小与截齿的切削厚度和旋转角度位置有关;研究了滚筒上受到的瞬时力与平均力的计算方法,推导了综合旋转角度和切削厚度的载荷波动系数的计算公式,并对所建立的公式进行了仿真模拟。结果表明:截齿数目从偶数增加1变为奇数时,载荷的波动系数的值明显减小;截齿从奇数增加1变为偶数时,载荷的波动系数不一定减小;适量的增加滚筒上同一螺旋线上截齿的数目可以有效的减小载荷的波动系数;为了提高截齿的使用寿命和可靠性以及滚筒的稳定性,减小滚筒和整个采煤机的冲击性,同一螺旋线上一周内截齿的数目应该尽量选用奇数。     

DIAGNOSTICS OF FATIGUE CRACK IN ULTERIOR PLACES OF LARGER-SCALE OVERLOADED SUPPORTING SHAFT BASED ON TIME SERIES AND NEURAL NETWORKS

To improve the diagnosis accuracy and self-adaptability of fatigue crack in ulterior place of the supporting shaft, time series and neural network are attempted to be applied in research on diag-nosing the fatigue crack’s degree based on analyzing the vibration characteristics of the supporting shaft. By analyzing the characteristic parameter which is easy to be detected from the supporting shaft’s exterior, the time series model parameter which is hypersensitive to the situation of fatigue crack in ulterior place of the supporting shaft is the target input of neural network, and the fatigue crack’s degree value of supporting shaft is the output. The BP network model can be built and net-work can be trained after the structural parameters of network are selected. Furthermore, choosing the other two different group data can test the network. The test result will verify the validity of the BP network model. The result of experiment shows that the method of time series and neural network are effective to diagnose the occurrence and the development of the fatigue crack’s degree in ulterior place of the supporting shaft.     

浅议机械论世界观主导地位之确立

占现代人类主导思想地位的机械论世界观,它的统治地位的确立是一个循序渐进的过程,先后经历了机械论大门的开启者培根,机械论世界观的架构者笛卡尔,机械论世界观主导地位确立和宣扬者牛顿,以及机械论世界观的社会意识形态补充者洛克,机械论世界观的经济意识形态的确立者斯密,再加上机械论世界观进步思想的巩固者达尔文等在各自不同领域的不懈探索和大力倡导,再加上其它意识形态领域潜移默化地影响而逐步得以确立。     

EFFECTS OF LEAD WIDTHS AND PITCHES ON RELIABILITY OF QUAD FLAT PACKAGE （QFP）SOLDERED JOINTS

The finite element method(FEM)is used to analyze the effects of lead widths and pitches on reliability of soldered joints.The optimum simulation for QFP devices is also researched.The results indicate that when the lead pitches are the same,the maximum equivalent stress of the soldered joints increases with the increasing of lead widths,while the reliability of the soldered joints reduces. When the lead widths are the same,the maximum equivalent stress of the soldered joints doesn't decrease completely with the increasing of lead pitches,a minimum value of the maximum equivalent stress values exists in all the curves.Under this condition the maximum equivalent stress of the sol- dered joints is relatively the least,the reliability of soldered joints is high and the assembly is excel- lent.The simulating results indicate the best parameter:The lead width is 0.2 mm and lead pitch is 0.3 mm(the distance between two leads is 0.1 mm),which are benefited for the micromation of QFP devices now.The minimum value of the maximum equivalent stress of soldered joints exists while lead width is 0.25 mm and lead pitch is 0.35 mm(the distance between two leads is 0.1mm),the devices can serve for a long time and the reliability is the highest,the assembly is excellent.The simulating results also indicate the fact that the lead width is 0.15 mm and lead pitch is 0.2 mm maybe the limit of QFP,which is significant for the high lead count and micromation of assembly.     

XML处理装备易损性仿真中毁伤树问题的应用

利用了XML数据结构的特点,很好地解决了装备易损性仿真中关于毁伤树的描述、读取和处理的问题.     

基于毛细力的芯片微操作方法研究

提出一种基于毛细力的芯片微操作方法,可实现微芯片的精准拾取、释放以及与尺寸匹配的基底的高精度自对齐。开发可精确模拟液桥形态的双迭代算法,求解微芯片操作过程中的拾取力与释放力,深入研究基于毛细力的微芯片的拾取以及释放的机理以及必要条件。研究液滴体积、基底接触角对微芯片拾取力和释放力的影响。结果表明,拾取力和释放力均随液滴体积的增大而增大,释放力随基底接触角的减小而增大。进一步通过试验验证基于毛细力的芯片微操作方法的可行性,研究液滴体积对微芯片操作的影响,并统计微芯片操作的成功率。基于毛细力的微操作方法在软体机器人、微机电系统、可穿戴设备的集成等领域具有潜在应用。