共查询到20条相似文献,搜索用时 93 毫秒
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文中针对搅拌摩擦焊,进行了搅拌头的形状选择,建立了搅拌头优化的数学模型和约束条件,提出了基于遗传算法的搅拌头尺寸多目标优化算法,并进行了忧化实例分析,得到了合理的搅拌头尺寸参数。 相似文献
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一种用于搅拌摩擦焊厚板焊接的新型搅拌头 总被引:1,自引:0,他引:1
针对厚板在搅拌摩擦焊接时下层金属焊接温度偏低、金属流动不畅、容易产生组织疏松或空洞,而上层金属因温度过高、流体压力过大而产生溢出和飞边等典型厚板焊接问题,从优化搅拌头结构的角度出发,设计出一种新型厚板焊接强力搅拌头。在焊接20mm高强度铝合金的实验中有效地消除飞边和空洞缺陷,获得了成功的应用。 相似文献
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搅拌摩擦焊焊接温度数值模型及其影响因素 总被引:1,自引:1,他引:1
通过对搅拌摩擦焊过程进入稳定状态后摩擦产热与散热机制的分析,建立了搅拌摩擦焊焊接温度的数值模型。由数值模型可知,影响焊接温度的各种因素包括被焊材料和搅拌工具材料的物理性质、两者之间的摩擦因数、搅拌工具的尺寸、焊接参数、被焊材料表面受到的轴向压力和侧面受到的进给压力等,有些因素之间还互相影响,关系复杂。其中,搅拌工具的旋转速度、搅拌工具与被焊材料之间的摩擦因数、被焊材料表面受到的轴向压力及侧面受到的进给压力是主要因素。以聚氯乙稀板材搅拌摩擦焊为例,验证了在适当的取值范围内焊接温度数学模型的理论计算值与实测值基本吻合。 相似文献
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搅拌摩擦焊接头摩擦磨损性能研究 总被引:1,自引:0,他引:1
在MM-200型摩擦磨损试验机上分别试验了LF2铝合金搅拌摩擦焊接接头焊缝区和母材的摩擦磨损性能。通过测定失重量和摩擦力矩的波动情况,得出了在不同的工艺参数条件下试样的抗磨损性和摩擦因数的变化规律。实验结果表明:搅拌摩擦焊接头的摩擦磨损性能明显优于母材,当正压力从50N增加到106N时,母材的失重量增加近6倍,母材的失重量在同等垂直载荷的情况下是焊缝的10-20倍。实验还表明搅拌摩擦焊接接头的摩擦力矩较小并且波动平缓。搅拌摩擦焊接头区域的磨损机制从磨粒磨损方式转变为疲劳磨损方式。 相似文献
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Preetish Sinha S. Muthukumaran R. Sivakumar S. K. Mukherjee 《The International Journal of Advanced Manufacturing Technology》2008,36(5-6):484-489
This paper discusses a method for online condition monitoring of the friction stir welding (FSW) process using image processing
techniques. Many FSW experiments are carried out at different process parameters and images of the first mode of the weld
zone are captured. They are subsequently digitally processed and analysed using MATLAB to study the variations in the quality
of weld, subjected to various conditions such as pin failure, and pin depth. This facilitates development of a methodology
for online condition monitoring. 相似文献
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Zhang Pengxian Zhang Hongjie Chen Jianhong Ma Yuezhou 《Frontiers of Mechanical Engineering in China》2007,2(3):330-335
A new method is developed to monitor joint quality based on the information collection and process in spot welding. First,
twelve parameters related to weld quality are mined from electrode displacement signal on the basis of different phases of
nugget formation marked by simultaneous dynamic resistance signal. Second, through correlation analysis of the parameters
and taking tensile-shear strength of the spot-welded joint as evaluation target, different characteristic parameters are reasonably
selected. At the same time, linear regression, nonlinear regression and radial basis function (RBF) neural network models
are set up to evaluate weld quality between the selected parameters and tensile-shear strength. Finally, the validity of the
proposed models is certified. Results show that all of the models can be used to monitor joint quality. For the RBF neural
network model, which is more effective for monitoring weld quality than the others, the average error validated is 2.88% and
the maximal error validated is under 10%.
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Translated from Chinese Journal of Mechanical Engineering, 2006, 42(10): 176–181 [译自: 机械工程学报] 相似文献
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针对现有设备状态监测系统中存在的集成度不高、适应性差和状态数据利用率低等缺点,研究并建立了基于无线传感器网络的机械设备智能状态监测系统原型.其核心是设计基于MSP430微控制器的智能传感器网络节点;利用微控制器单元的信号分析能力,进行状态数据的本地化处理和数据融合,实现数据采集与信号处理相结合的分布式状态监测,形成具有初步自我分析诊断能力的状态维护传感器网络.开发并应用于某石化企业大型机组的智能状态监测原型系统,提高了设备状态数据采集与处理的效率,有效地降低了采集点与故障诊断中心之间的通信流量. 相似文献
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实时准确地监测铣削状态对于提高加工质量与加工效率具有重要意义,切削力作为重要的加工状态监测对象,因其监测设备昂贵且安装不便而受到限制,为此提出一种考虑刀具磨损的基于主轴电流的铣削力监测方法.首先基于切削微元理论建立了考虑后刀面磨损的铣削力模型,并通过铣削实验进行铣削力模型系数标定;然后对主轴电流与铣削力的关系进行理论建... 相似文献
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《机电工程》2014,(5):655-670
In orther to solve the problem of the much production points and the large workload of control system needs to be connected in Handan Iron and steel plant, and the production process was complex, and the branch of workshop were not fully coordinated, the LabVIEW was taken as a platform to design a set of power plant on-line monitoring system, its functions included data acquisition, data storage and analysis, trend analysis, fault diagnosis and other functions. First the server of the system was designed, it was included three modules of data acquisition, data storage, data released, and then designed the client of the system, included the system setting module, signal display module, signal monitoring and analysis module. Under guarantee the efficiency of fault detection, the storage space was greatly reduced. The results show that the monitoring system was convenient early warning before malfunction immediately, and after failed, it was convenient for the engineering technical personnel to call history data, judged fault reason and analysis. [ABSTRACT FROM AUTHOR] 相似文献
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机车信号自动监测系统对提高列车的运行安全,及时准确掌握车载设备和地面设备的运行情况具有重要意义。本文针对机车信号监测系统的性能要求。提出了一种基于虚拟仪器技术和PXI总线的机车信号自动监测系统的设计方案,介绍了该系统的工作原理、硬件结构和软件的实现方法。 相似文献
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The local chemical properties of the contacting asperities in a real tribosystem are of crucial importance for the resulting macroscopic tribo-behavior. Thus, the lateral forces acting on the tip of a standalone scanning force and friction microscope have been investigated as a function of controlled surface chemistry, realized by potentiostatic control of the sample. The results obtained show a clear dependence of nanoscale friction behavior upon changes in the electrochemical state of the system. 相似文献
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基于图像处理的在线实时监测系统设计 总被引:1,自引:0,他引:1
王懋 《机械设计与制造工程》2016,(7):44-47
针对传统远程监测存在的图像质量差的问题,提出一种基于图像处理的远程实时监测系统.利用Web技术对系统整体架构、系统功能和开发环境等进行搭建,从而为图像的远程监控提供功能处理界面;利用图像处理算法对彩色模型选择、图像归一化、图像分割和图像去噪等进行处理,提高了图像采集的质量.最后通过系统运行,验证了该算法的可行性,为远程图像实时监控系统开发提供参考. 相似文献