共查询到19条相似文献,搜索用时 187 毫秒
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自组织模糊控制CO2弧焊逆变电源 总被引:1,自引:0,他引:1
余蔚 《机电产品开发与创新》2003,(2):38-40
本文介绍了一种新型CO2弧焊逆变电源。本电源从电弧物理过程出发,运用表面张力过渡理论控制焊接电流波形以减少CO2焊接时的飞溅。根据自组织模糊控制的基本原理设计了一种模糊控制器,用于实现表面张力过渡焊的电压电流波形。在进行短路过渡CO2焊接时能明显减少飞溅,同时改善焊缝成型。 相似文献
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协同式CO2焊短路过渡模糊控制系统研究 总被引:1,自引:0,他引:1
《机械工程学报》2001,37(12):97-99
介绍了一种在波形控制基础上,采用电弧自身传感的协同式模糊控制方法对焊接过程参数进行实时控制的逆变式CO2焊机控制系统.它通过电弧自身传感对CO2焊接过程有重要影响的短路过渡频率的检测,通过模糊处理和模糊判决之后,实时的对电弧电压进行控制,以保持焊接过程中规范参数的协同匹配关系.试验结果表明,采用该控制系统的焊机,实现了焊接规范参数的自动匹配和自动调节,同时明显改善了焊缝成形和降低了焊接过程中的飞溅. 相似文献
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针对短路过渡CO2气体保护焊在焊丝伸出长度变化较大时,焊接电弧稳定性差,易导致焊接过程中断和焊缝成形不良的问题,采用一种以ADI公司的ADSP2181数字信号处理器为核心,设计具有全数字控制特点的CO2焊短路过渡模糊控制系统.模糊控制系统由模糊控制器和波形控制参数在线调整两部分组成,模糊控制器主要是调节送丝速度,而后以送丝速度为依据,通过波形控制参数在线调整包括焊接电源输出电压在内的短路过渡波形控制参数.试验证明,模糊控制系统通过在线焊接平均电流检测与计算,自动调整送丝速度和波形控制参数,增强了焊接过程中焊丝伸出长度变化时焊接电弧的稳定性,提高了短路过渡CO2焊丝伸出长度的适应范围,焊丝伸出长度的变化在8~45 mm的范围内均可获得良好的焊缝成形. 相似文献
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水下焊接技术是海洋油气设施建造及核电站维修的关键技术之一。水下湿法电弧稳定性是水下湿法焊接的关键问题,提高水下焊接电弧稳定性对促进水下焊接技术具有重要意义。搭建了用高压舱模拟水下环境进行FCAW水下湿法焊接的试验平台,以焊接电流、电压和水深三个焊接工艺参数为自变量,设计了三因素五水平的响应曲面( RSM)试验方案,建立了电弧稳定性与焊接参数之间的响应曲面模型。对单一焊接参数以及参数间的交互作用对电弧稳定性的影响、水下湿法焊接电压电流的匹配规律和焊接工艺范围进行了研究。 相似文献
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Evaluation of scatter-search approach for scheduling optimization of flexible manufacturing systems 总被引:1,自引:1,他引:0
M. Saravanan A. Noorul Haq 《The International Journal of Advanced Manufacturing Technology》2008,35(9-10):978-986
This paper presents an automatic welding control system for the alternating current shield metal arc welding process. A nominal nonlinear mathematical model containing uncertainties such as dead-zone, welding control system saturation, and the identified system parameters is derived. A novel variable structure model reference control scheme is designed to modulate the rate of the electrode feed mechanism, thereby regulating the arc current. The developed controller assures the global reaching condition of the sliding mode of the controlled welding system. In the sliding mode, the electric current error between the plant and the model asymptotically approaches zero. Moreover, the welding system remains insensitive to uncertainties and disturbance as the systems with friction. The simulation and experimental results confirm that the automatic welding control system, based on the proposed model-following variable structure controller, successfully maintains the magnitude of the arc current at the desired value and preserves the stability of the arc length, thereby ensuring excellent welding performance. 相似文献
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采用特征谐波法准确识别焊缝偏差,研究熔池对坡口的影响作用,采用补偿因子加权处理可有效地减小这种影响,因此提高了对偏羔的识别能力。采用规则自调整模糊控制器进行焊缝纠偏控制,以克服常规模糊控制器的不足,使其具有良好性能。 相似文献
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Chien-Yi Lee Pi-Cheng Tung Wen-Hou Chu 《The International Journal of Advanced Manufacturing Technology》2006,29(5):481-489
This paper describes an automatic welding control system developed for alternating current shielded metal arc welding (SMAW).
This method could replace manual operations which require a well-trained technician. We have derived a mathematical model
of the welding control system and identified the system’s parameters. The sliding surface is used as the input variable to
reduce the number of fuzzy reasoning rules, in comparison with the conventional two-dimensional fuzzy logic control (FLC)
algorithm. An adaptive fuzzy sliding mode controller (AFSMC) consists of an equivalent control part and a hitting control
part. An adaptive law derived from a Lyapunov function is used to obtain the FLC’s parameters, and is applied to approximate
the equivalent control part of the sliding mode control (SMC), so that the system states can be forced to zero. By using three-rules
FLC, the control part that satisfies the hitting conditions of the SMC can force the system’s states to reach and remain on
the sliding surface. Therefore, the stability of the AFSMC can be guaranteed and can be used to modulate the rate of the electrode
feeding mechanism that regulates the arc current of the SMAW. The simulation and the experimental results both show that this
automatic welding control system, based on the AFSMC, can perform effectively. 相似文献
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Chien-Yi Lee Pi-Cheng Tung Wen-Hou Chu 《The International Journal of Advanced Manufacturing Technology》2006,29(5-6):481-489
This paper describes an automatic welding control system developed for alternating current shielded metal arc welding (SMAW).
This method could replace manual operations which require a well-trained technician. We have derived a mathematical model
of the welding control system and identified the system’s parameters. The sliding surface is used as the input variable to
reduce the number of fuzzy reasoning rules, in comparison with the conventional two-dimensional fuzzy logic control (FLC)
algorithm. An adaptive fuzzy sliding mode controller (AFSMC) consists of an equivalent control part and a hitting control
part. An adaptive law derived from a Lyapunov function is used to obtain the FLC’s parameters, and is applied to approximate
the equivalent control part of the sliding mode control (SMC), so that the system states can be forced to zero. By using three-rules
FLC, the control part that satisfies the hitting conditions of the SMC can force the system’s states to reach and remain on
the sliding surface. Therefore, the stability of the AFSMC can be guaranteed and can be used to modulate the rate of the electrode
feeding mechanism that regulates the arc current of the SMAW. The simulation and the experimental results both show that this
automatic welding control system, based on the AFSMC, can perform effectively. 相似文献
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以旋转电弧为传感器的移动机器人角焊缝跟踪 总被引:1,自引:0,他引:1
研究以旋转电弧作为传感器,采用轮式移动机器人对具有直角转弯的角焊缝进行跟踪焊接的控制方法。采用分段控制的方法设计控制器对水平滑块进行控制,以实现直线段焊缝的跟踪。该控制器在大偏差时采用比例控制,在小偏差时采用参数自调整模糊控制,并利用免疫反馈规律对比例因子进行修正,实现了直线焊缝、小曲率焊缝和小折角焊缝的跟踪。分析直角转角处焊缝跟踪时机器人的运动学模型,并利用旋转电弧传感器检测到的焊枪倾角信息检测直角拐点,利用超声波传感器检测前方焊缝位置,设计控制器对车轮和水平滑块进行协调控制。最后,通过实际焊接试验证明了该方法的有效性。 相似文献
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设计了一套由三轴直角坐标机器人、线激光传感器和工业计算机组成的焊缝跟踪系统。研究了该系统所涉及的测量原理、特征点测量方法和基于模糊自适应的控制方法。通过高斯核相关算法(KCF)在焊接过程中实时检测焊缝特征点,并根据测量原理计算获得特征点相对于相机坐标系的三维坐标值。设计了一种自适应模糊控制器,通过自适应模糊控制器计算坐标的偏差值和偏差变化率得到焊枪末端运动轨迹的控制量,同时对模糊控制器的输入输出论域、模糊规则和隶属函数进行实时动态更新。实施了焊缝跟踪实验。结果显示:采用最大焊接电流为350 A的惰性气体保护焊(MIG),在强烈弧光和飞溅的干扰下,该系统能实时跟踪焊接工件,跟踪精度为0.325 3mm,传感器测量频率为20Hz。焊接过程中焊枪末端运行平稳,焊缝轨迹跟踪准确,且抗干扰能力,能满足焊接应用要求。 相似文献