排序方式: 共有41条查询结果,搜索用时 15 毫秒
1.
PMIG焊焊接电弧电压的模糊控制 总被引:5,自引:2,他引:5
模糊控制是一种新型智能控制方法。本文介绍作者拟对脉冲熔化极气体保护焊(PMIG焊)焊接过程中的电弧电压参数进行模糊控制,取得了良好的焊接电弧稳定性和焊缝成形的效果。 相似文献
2.
3.
This paper presents an integrated simulation model for full digital controlled PMIG/MAG welding system with Matlab/Simulink, and it consists of power inverter, digital control system and dynamic arc-load model. An integrated simulation study was done for fuU digital PMIG/MAG welding, and a method of connecting dynamic arc-load model to the system with controlled current source was presented, in addition, the simulation results were utilized to study the issues of digital control PMIG/MAG welding in this paper. The experimental results validated the developed simulation model, and this simulation study can be applied in implementation of the full digital PMIG/MAG welding and analysis of system dynamic process. 相似文献
4.
5.
6.
This paper presents a comparative study of reactive power control for isolated wind-diesel hybrid power system in three different cases with wind power generation by induction generator (IG), permanent-magnet induction generator (PMIG) and permanent-magnet synchronous generator. The synchronous generator (SG) is used with diesel engine set. A mathematical model of the system based on small signal analysis, is developed considering reactive power flow balance equations. The variable reactive power needed by the system is provided by a static synchronous compensator (STATCOM) when wind power generation is done by IG and PMIG. When permanent-magnet synchronous generator (PMSG) is used for wind power generation, the variable reactive power demand is fulfilled by a voltage source converter (VSC) which is on the load side. A new mathematical approximation model for VSC connected with PMSG is proposed such that the voltage source converter fulfills the increased reactive power requirement of load and also increases its active power equal to the increased input wind power. Proportional and integral (PI) gains of the STATCOM and VSC controllers are optimized using integral square error criterion (ISE). The dynamic responses of the system for small (1%) step increase in load reactive power with and without 1% step increase in input wind power are shown. The paper also shows the dynamic responses of the system for random step change in load reactive power plus random step change in input wind power. The MATLAB/SIMULINK environment is used for simulation. 相似文献
7.
弧焊逆变电源是一种直流焊接电源,与传统的交流焊接电源和整流式焊接电源相比,具有众多优点.本文首先设计分析PMIG弧焊逆变电源整体结构,接着就设计的弧焊逆变电源电压电流双闭环系统控制器给出了模糊控制原则和相应的设计结构,最后通过实验验证测试,表明本系统能够取得良好的控制效果以及能够保证弧长和焊接过程的稳定.这一研究对于PMIG弧焊的进一步发展具有一定的意义. 相似文献
8.
搭建了单电源并联并列式双丝脉冲MIG焊接工艺试验系统,在试验过程中采集了双路焊接电流及电压信号,并对焊接过程中的电弧行为与熔滴过渡过程进行了同步拍摄.应用上述试验系统,在实现稳定焊接过程的基础上,分别研究了焊丝间距,电弧电压两个因素对单电源并联并列式双丝脉冲MIG焊交替燃弧过程的影响.结果表明,随着焊丝间距增加,电弧电压增大,交替燃弧频率减小,交替现象显著.焊接过程中产生的带电粒子的行为方式是交替燃弧现象的重要影响因素. 相似文献
9.
10.
焊接电流影响GMAW双丝焊电弧等离子体的数值模拟研究 总被引:1,自引:0,他引:1
基于电磁学理论和流体力学理论,建立熔化极气体保护焊(Gas metal arc welding,GMAW)双丝焊焊接电弧等离子体三维数学模型,利用流体力学软件Fluent对其进行求解。重点研究焊接电流对GMAW双丝焊电弧等离子体行为的影响规律,获得了电弧温度、电流密度、热通量、磁场分布等结果。研究发现,随着焊接电流的变化,电弧等离子体形状变化显著。随着焊接电流的增大,电弧最高温度和电弧偏转角随之增大,电流密度和工件表面热通量由双峰分布转变为单峰分布,并且热通量峰值随焊接电流的增大而增大。此外,随着焊接电流的增大,磁感应强度和磁场力随之最大,磁场分布由独立两个磁场向耦合磁场转变。为有效、定量地证明模拟结果准确性,开展焊接试验,利用高速摄像监测电弧行为,利用光谱测温测量电弧温度。结果表明模拟结果同试验结果吻合良好,研究结果为合理选择GMAW双丝焊焊接电流参数提供理论依据。 相似文献