一种新型智能打结设备的运动控制方法研究

在分析一种新型智能打结设备机电系统的运动原理基础上,针对缝制图样数据的2种设计方案,研究并提出了满足该类设备控制需要的2种运动控制方法,并通过理论分析和实际测试对这2种方法的性能进行了评价.     

金刚石串珠绳耐用度经验公式的实验研究

为了实现海底石油管道切割作业,采用均匀设计方法对水下金刚石绳锯串珠绳的耐用度进行了试验研究.使用MINITAB软件,建立了主要工艺参数对耐磨损率的多元线性回归方程,进行了回归分析,求得了绳锯耐磨损率较为精确的经验公式.进一步探讨了水下金刚石绳锯耐磨损率的工艺规律,为满足绳锯机设计要求,优化工艺参数提供了理论依据.     

精密机床折返过程齿隙及摩擦补偿方法研究

针对齿隙、摩擦等非线性因素对运动控制精度的影响,考虑精密机床加工过程不允许出现超调量的特殊要求,研究了机床折返时驱动轴与负载轴分离的不可控过程。建立了系统动力学变结构模型,采用自适应变结构控制方法,能够根据系统运行状态自适应改变滑动方程参数,该控制方法既能补偿齿隙、摩擦的不利影响,保证加工精度,又可满足折返时的快速性和没有超调量的特殊要求。仿真结果验证了该方法的可行性。     

环件辗扩过程的导向辊控制工艺及设备的研究

导向辊的控制在环件辗扩中有着重要意义.对现有的导向辊控制方式及其存在的问题进行了分析,通过对导向辊运动轨迹的分析,提出了一种新的导向辊控制工艺,并给出了该控制工艺的设备实现方法.最后通过有限元分析软件ABAQUS对具体的环件辗扩实验进行了模拟分析,结果表明,采用该导向辊控制工艺进行环件辗扩可以得到较高质量的环件产品.     

基于机器视觉与改进遗传算法的机械手分拣方法研究

针对机械零部件快速分拣需求,提出一种基于机器视觉与天牛须改进遗传算法(BAS-GA)的机械手分拣方法。该分拣方法首先对零件图像进行预处理,然后利用Sift特征匹配的图像识别算法提取零件图像,并使用仿射变换对目标零件定位。接着,对得到的零件位置建立数学模型,使用BAS-GA算法求解该数学模型,得到机械手的抓取路径,实现机械手的快速分拣。实验表明BAS-GA算法相对于模拟退火算法,遗传算法和一种改进蚁群算法都取得了较好的寻优效果。经过优化后的路径缩短了11%,说明该方法可有效提升机械手分拣速度。     

简述重量分选机的安装与调试

本文主要介绍了重量分选机（以下简称＂检重秤＂）的组成、特点、技术性能以及它的工作原理。     

基于ARM的自动捋管机控制系统设计

本文设计并实现了基于ARM Cortex-M3内核的LPC1768芯片为控制器的自动捋管机控制系统,详细叙述了纱管的监测原理。本系统主要由硬件系统和软件系统两部分,可实现对有纱管准确地检测和剔除,以及对纱管颜色的判断和分类。     

Investigation and prediction of chip geometry in diamond turning

Management of the chips generated in diamond turning is often critical, because contact between chips and the workpiece can result in superficial damage to the finished surface. Controlling chip motion is not a trivial process as the proper positioning of an oil or air stream requires an understanding of the dynamics of a diamond turned chip and the machining parameters that affect it. Work has been performed to investigate the effects of cutting speed, depth of cut, tool geometry, tool wear, and workpiece material properties on chip motion and geometry. Utilizing radius of curvature data from cutting experiments, a parameter has been proposed that can be used to predict chip radius of curvature for a wide range of machining conditions. This chip curvature parameter, χ, exhibits a power law relationship with chip radius of curvature as a function of tool geometry, depth of cut, cutting speed, and both elastic and plastic properties of the workpiece material.     

基于高速并联机械手的电池质量分拣机设计

结合我国电池企业生产需要,设计了一种基于高速并联机械手的电池质量分拣机。首先进行了可充电电池质量自动分拣机总体方案设计。根据电池分拣布局确定了机构的工作空间尺寸和机构的基本尺寸,进行了机构的详细设计并对机构的动、静态性能进行分析和结构优化设计。在此基础上开发了分拣系统产品化样机。其性能与进口设备相当,而成本仅为进口设备的1／3。     

Investigation of the direction of chip motion in diamond turning

Management of the chips generated in diamond turning is often critical since contact between chips and the workpiece can result in superficial damage to the finished surface. Controlling chip motion is not a trivial process as the proper positioning of an oil or an air stream requires an understanding of the dynamics of a diamond turned chip and the machining parameters that affect it. Previous work [1] introduced the chip curvature parameter, χ, which is useful in predicting chip radius of curvature over a wide range of cutting speeds, depths of cut, tool geometries and workpiece material properties. To control chip motion, however, an understanding of the direction chips leave the tool/workpiece interface must also be obtained. Cutting experiments were performed investigating the influence of cutting speed, depth of cut, feed rate, tool path angle, tool geometry and tool orientation on the directional characteristics of the motion of diamond turned chips. Flow angle measurements obtained during cutting were found to remain within ± 10° of predictions from a simple geometrical model originally proposed for conventional machining.     

清洁制造工艺系统设计原则及策略的探讨

清洁化生产是一种新的制造模式 ,它是企业实现可持续发展战略的必然选择 ,企业实施清洁化生产技术只是时间早晚的问题。在深入分析清洁化生产内涵的基础上 ,提出了面向清洁制造工艺系统及过程设计原则 ,并详细探讨了工艺过程设计中面向清洁制造的设计策略     

Analysing and sorting human chromosomes

Analysing and sorting human chromosomes by flow cytometry is a powerful tool in the hands of the molecular biologist. Because of the large number of chromosomes analysed by flow, typically 105 for each sample, estimates of the distribution of DNA throughout the chromosome complement of an individual can be made to within three megabase pairs. Rearrangements of DNA in this size range can often be clearly seen and measured by flow cytometry in situations where it was not obvious by traditional cytogenetics. The production of enriched samples of a particular chromosome by flow sorting and the subsequent construction of DNA libraries has played an important part in mapping genes to particular hereditary diseases. Techniques now exist which allow the hybridization of a few thousand sorted chromosomes with characterized or uncharacterized DNA probes to give relatively quick answers about specific chromosome genes. The process of obtaining a sorted chromosome sample from a growing population of peripheral blood lymphocytes or lymphoblastoid cells is compared with other methods of achieving similar results in molecular biological terms. Advances in flow cytometric techniques, which include slit-scanning and hybridization of DNA probes in suspension, are likely to improve the enrichment quality of specific sorted human chromosomes.     

滚丝机床的一种定心装置设计

介绍滚丝机床的一种定心装置设计,并给出该装置的结构及设计参数。     

机械产品多元质量特性重要度排序方法

针对机械产品多元质量特性重要度排序的复杂性,提出了一种基于模糊层次分析法和信息熵的模糊综合方法,以有效处理传统单一方法计算过程存在的主观性和模糊性问题。综合运用模糊理论和模糊层次分析法建立了多元质量特性重要度排序模型,用三角模糊数表示模糊比较判断的方法计算主观权重,并使用信息熵确定质量特性指标层的客观权重。应用模糊Borda方法组合模糊层次分析法和信息熵法进行排序,根据模糊Borda数值大小最终决定多元质量特性的重要度。通过具体实例验证了该方法的合理性和可行性。