共查询到18条相似文献,搜索用时 187 毫秒
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介绍了基于Zig Bee和Lab VIEW技术的多地无线温湿度监测系统设计方法。系统由以STC89C52RC单片机、ZigBee无线数据收发模块DRF1605H为核心构成的温湿度测量和无线数据传输以及基于Lab VIEW的监测界面与程序组成。无线数据收发模块与单片机、监控PC间采用串行通信,实现温湿度测量、监测与报警。实验结果表明:系统能准确地、同步地实现现场的、远程的多地温湿度监测和报警,运行稳定可靠。 相似文献
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采用集成基于事例推理,模糊推理,模糊神经网络(FNN)等多种人工智能推理技术,建立了铝合金电阻点焊工艺参数设计系统。选取导电率、屈服强度等材质的物理参数为电阻点焊工艺参数求解模块入口参数,更加符合铝合金电阻点焊过程的物理本质;引入规范强度参数,使铝合金电阻点焊焊接参数的选择更加灵活;在此基础上建立FNN铝合金电阻点焊工艺焊接求解模型,提高系统求解的智能性及其学习能力。在铝合金电阻点焊过程数值模拟的基础上,以铝合金电阻点焊焊接参数数值模拟作为已有的铝合金电阻点焊工艺参数库的补充,丰富了神经网络的训练样本,增强了系统的泛化能力。系统应用实例表明可以满足铝合金电阻点焊工艺参数设计要求。 相似文献
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电阻点焊是汽车制造业常用的焊接工艺,焊点的质量直接决定汽车车身的质量,且因其特殊性而无法实时监测。RAFTTM自适应技术的出现,在一定程度上弥补了这个缺陷。通过监测次级电阻来补偿能量,最终达到焊接的可靠性和稳定性,同时也对过程进行评估。由于能对电阻点焊的焊接过程进行必要的控制和评估,在质量控制方面比原来的方法有大幅的提高,该技术在汽车车身焊接应用方面有很大的优势。 相似文献
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根据高强钢板的物理特性,介绍高强钢板电阻点焊的难点,通过优化焊接参数,如增大焊接压力、延长焊接时间、减小焊接电流、增加焊前预热、减小修磨间隔点等可以有效消除高强钢点焊过程中的焊点毛刺、焊点裂纹和熔核缩孔等缺陷。简述博世UIR系统的动态电阻检测原理、恒功率补偿原理和焊点质量监控原理。采用UIR系统采集并建立焊点的标准动态电阻曲线,根据标准动态曲线对点焊过程进行能量补偿,有效弥补高强钢点焊常见的飞溅导致的能量损失,提高焊点质量。通过UIR系统监控功能有效保障焊点质量和点焊过程的稳定性,满足高强钢实际生产需要,并延长电极使用寿命。 相似文献
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Poor quality of resistance spot welding (RSW) often causes quality issues like structural integrity and noise in the car body assembly. Research activities for reliable monitoring methods of RSW quality have therefore been extensive. So far, most of the monitoring methods found in literature are good for off-line utilization only and thus very expensive to apply. This paper introduces into a real-time and in-situ RSW quality monitoring method, which takes the input electrical impedance of the welding system as the monitoring signature. This signature is obtained by probing and processing the input voltage and current throughout the welding process. As input impedance characterizes a dynamic system, its variation with time reveals the conditions of the welding process which result in the final weld quality. By recognizing the pattern of the real part by an artificial neural network, we demonstrate that the weld quality could be classified non-destructively and automatically. Due to the fast signal collecting and processing, the quality monitoring is finished almost in real-time, i.e., classification can be completed before the next welding process is started. Another feature of the method is being in-situ because monitoring action does not jeopardize the welding operation or alter any of the welding parameters in general. 相似文献
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A method was developed to realize quality evaluation on every weld-spot in resistance spot welding based on information processing of artificial intelligent. Firstly, the signals of welding current and welding voltage, as information source, were synchronously collected. Input power and dynamic resistance were selected as monitoring waveforms. Eight characteristic parameters relating to weld quality were extracted from the monitoring waveforms. Secondly, tensile-shear strength of the spot-welded joint was employed as evaluating target of weld quality. Through correlation analysis between every two parameters of characteristic vector, five characteristic parameters were reasonably selected to found a mapping model of weld quality estimation. At last, the model was realized by means of the algorithms of Radial Basic Function neural network and sample matrixes. The results showed validations by a satisfaction in evaluating weld quality of mild steel joint on-line in spot welding process. 相似文献