共查询到20条相似文献,搜索用时 484 毫秒
1.
2.
本文介绍一种基于磁致伸缩原理的长行程全数字直线位移传感器,其具有线性度好、分辨率高、与PLC接口简单、结构紧凑、安装方便等优点。本文阐述了它的工作原理及其在模锻水压机平衡校正系统动梁四角位移测量中的应用。 相似文献
3.
在r射线工业CT的原始数据中包含了各种误差,须作校正。文献〔1〕给出了散射修正。本文研究了能谱硬化修正、采传系统的一致性校正、死时间校正以及扇形扫描中的镜象对称,并且给出了相应的数学模式。 相似文献
4.
常用的电涡流位移传感器线性范围小且不耐高压,因此不能应用于电液伺服阀的阀芯位置检测,而差动变压器式位移传感器的频响相对较低,本文提出一种高频响、耐高压电涡流位移传感器结构,理论仿真和实验结果表明:该位移传感器具有良好的线性度、重复性和较高的频响,适用于高性能电液伺服阀和比例阀的阀芯或短行程液压缸活塞的位置检测。 相似文献
5.
6.
7.
传统里程计校正方法常使用离线校正手段,在地面环境发生改变的情况下,校正效果较差。为解决上述问题,提高机器人定位精度,以三轮全向移动机器人为平台,提出一种结构简单、鲁棒性强的在线里程计校正方法。该方法通过扩展卡尔曼滤波算法处理传感器数据,以得到机器人的实时位姿信息和速度信息,结合三轮全向移动平台的动力学模型,及时修正里程误差。在V-REP中设计仿真实验,实验结果表明:采用所提方法,校正后的里程精度有了极大改善,并克服了离线校正方法受地面环境影响的问题。在已有实际平台上验证了该算法的有效性。 相似文献
8.
李俊国 《组合机床与自动化加工技术》2003,(11):57-57,59
增量式光电位移传感器需辨向,一般给出的为硬件辨向电路。本文给出了一种增量式光电传感器辨向方法——软件辨向。它适用于各种增量式位移传感器的辨向与细分,程序简单、动态响应快。 相似文献
9.
板材剪切与冲裁加工实验的位移测量系统 总被引:1,自引:0,他引:1
针对板材剪切与冲裁加工的特点,设计了一种应变片式位移传感器。传感器可根据需要对量程进行调节,且相对精度不变,特别适于中小位移的测量。结合数据采集系统,在材料试验机上实现了板材剪切加工和精密冲裁实验的位移测量。 相似文献
10.
电涡流位移传感器是利用电涡流原理来实现对位移的非接触式精密测量的一种微型器件。FY-3气象卫星有效栽荷中分辨率光谱成像仪(MERSI)采用大冷量G型辐射制冷器冷却碲镉汞(HgCdTe)红外探测器,即长波红外和短波红外线列探测器,分别安装在辐射制冷器二级和一级上。G型辐射制冷器的后光路由于温度的降低和残余应力的存在会发生一定的不规律变形,必须测量此形变,确定低温下后光路的位置,便于对后光路进行低温红外光学校正。电涡流位移传感器是在真空和低温条件下测量此形变的合理选择。 相似文献
11.
扫描电镜观察显示胫骨是一种由羟基磷灰石和胶原蛋白组成的自然生物陶瓷复合材料.羟基磷灰石具有层状的微结构并且平行于骨的表面排列.观察也显示这些羟基磷灰石层又是由许多羟基磷灰石片所组成,这些羟基磷灰石片具有长而薄的形状,也以平行的方式整齐排列.基于在胫骨中观察到的羟基磷灰石片的微结构特征,通过微结构模型分析及实验,研究了羟基磷灰石片平行排列微结构的最大拔出能.结果表明,羟基磷灰石片长而薄的形状以及平行排列方式增加了其最大拔出能,进而提高了骨的断裂韧性. 相似文献
12.
13.
14.
15.
采用激光辐照对FeCrAlW电弧喷涂层的组织进行致密化处理,借助扫描电镜和X衍射对涂层的组织进行了分析.测试了涂层的显微硬度.结果表明:涂层组织致密度提高,孔隙率明显降低.随着激光扫描速度的增加,涂层的显微硬度降低.在较低的扫描速度下,涂层与基体之间形成互熔区,涂层与基体之间产生良好的冶金结合. 相似文献
16.
The technology of ultrasonic welding of components made of Capron tapes producing welded joints with high strength parameters has been developed. The numerical values of the main parameters of the conditions of ultrasonic welding of the Capron tapes are determined. It is shown that the increase in the amplitude and welding pressure shortens the welding time. The experimental results show that the Capron tapes are characterized by geometrical homogeneity in both the transverse and longitudinal direction so that the welded joints can be produced both along and across the tape. 相似文献
17.
宝山钢铁股份有限公司钢管分公司的穿孔机下辊主减速机在大定修前,减速机轴和下辊大电机的振动情况严重,诊断部门对该减速机进行了测振分析,结合对电机振动、减速机振动的频谱分析和对轴承的故障频率成分分析,找出了主减速机振动的原因是轴承损伤。该分析结果与解体检查的结果相一致。 相似文献
18.
《International Heat Treatment & Surface Engineering》2013,7(4):176-180
AbstractThe paper is devoted to 100th anniversary of the outstanding Russian scientist professor Yuriy Mikhailovich Lakhtin – the founder of the world-famous scientific school of surface strengthening of metals and alloys. Lakhtin's scientific school is recognised for its contribution into research of processes of thermochemical treatment of metals and especially of nitriding. Today at the Department of Metal Science and Heat Treatment of MADI his followers continue the traditions of Lakhtin's scientific school. The development of technologies of surface engineering is based on complex modelling of physical processes realised by thermochemical treatment of metals. Thermodynamic models describe the interaction between metals and components of saturating atmosphere and predict phase composition of diffusion layer. Diffusion models of kinetics of saturation of metals allow us to calculate the rate of growth of diffusion layer and regulation of its depth and structure. Structural models determine quantitative dependence between parameters of structure (grain size, dispersed particles, etc.) and mechanical properties. These models allow us to estimate the level of strengthening by control of structural specifics of strengthened layer. On the basis of this complex of models, new efficient technologies of surface strengthening are developed. 相似文献
19.
论述了CAD技术中参数化设计的三种建模方法,重点介绍了基于特征的参数化建模原理。在此基础上,分析机械设计中的机构结构,归纳出其零件的几何特征构成。设计了机构CAD图形库,并提出了该图形库生成步骤和人机交互界面。 相似文献
20.
Michihiro Takiguchi Fusahito Yoshida 《Journal of Materials Processing Technology》2003,140(1-3):441-446
The present authors proposed a new technique of plastic bending of adhesive-bonded sheet metals. In this process, large transverse shear deformation occurs in the adhesive layer, which in some cases would induce the geometrical imperfection (so-called ‘gull-wing bend’) and the delamination. Since the strength of the adhesive is highly rate-sensitive, the amount of shear deformation of the adhesive layer and, as a result, ‘gull-wing bend’, are strongly influenced by the forming speed. In the present work, the effect of forming speed on the deformation characteristics of adhesively bonded aluminium sheets was investigated by performing V-bending experiments with various punch speeds at room temperature. In order to discuss the effect quantitatively, the numerical simulations for the bending were also conducted using a rate-dependent constitutive model of plasticity for the adhesive. Consequently, it was found that the large shear deformation and ‘gull-wing bend’ are suppressed by high-speed forming since the deformation resistance becomes higher at high strain rate. 相似文献