scholarly journals A Single Cycle Inverter Welding Power Control System

2012 ◽  
Vol 4 ◽  
pp. 101-105
Author(s):  
Peng Fei Huang ◽  
Yang Yang Lu ◽  
Shao Jun Bai ◽  
Zhen Yang Lu
Keyword(s):  
Control System ◽  
Power Control ◽  
Short Circuit ◽  
Welding Process ◽  
Control Technique ◽  
Magnetic Saturation ◽  
Single Cycle ◽  
Waveform Control ◽  
Short Time ◽  
Saturation Dose

Single cycle control technique is applied in the field of welding power which makes waveform control in the various stages of arc and circuit in the welding process respectively based on the characteristics of the welding process. A new welding power control has been put forward which is able to adjust the grid voltage disturbance in a very short time. We choose dual single-ended forward topology as the main circuit and make flux reset for the transformer in each cycle to ensure that the transformer magnetic saturation dose not occur, meanwhile, controlling the condition of arcing and short circuit respectively to achieve a better welding effect.

scholarly journals Power control system for lightweight electric aircraft

2021 ◽  
Vol 1024 (1) ◽  
pp. 012073
Author(s):  
F A Zagumennov ◽  
A N Varyukhin ◽  
A V Kazakov ◽  
D I Zhuravlev ◽  
V S Zakharchenko ◽  
...  
Keyword(s):  
Control System ◽  
Power Control ◽  
Electric Aircraft ◽  
Power Control System

scholarly journals Intelligent Control Wheelchair Using a New Visual Joystick

2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Yassine Rabhi ◽  
Makrem Mrabet ◽  
Farhat Fnaiech
Keyword(s):  
Control System ◽  
Intelligent Control ◽  
Visual Recognition ◽  
Low Cost ◽  
Control Device ◽  
Control Technique ◽  
Hand Gesture ◽  
Functional Rehabilitation ◽  
Number Of Patients ◽  
Real Patients

A new control system of a hand gesture-controlled wheelchair (EWC) is proposed. This smart control device is suitable for a large number of patients who cannot manipulate a standard joystick wheelchair. The movement control system uses a camera fixed on the wheelchair. The patient’s hand movements are recognized using a visual recognition algorithm and artificial intelligence software; the derived corresponding signals are thus used to control the EWC in real time. One of the main features of this control technique is that it allows the patient to drive the wheelchair with a variable speed similar to that of a standard joystick. The designed device “hand gesture-controlled wheelchair” is performed at low cost and has been tested on real patients and exhibits good results. Before testing the proposed control device, we have created a three-dimensional environment simulator to test its performances with extreme security. These tests were performed on real patients with diverse hand pathologies in Mohamed Kassab National Institute of Orthopedics, Physical and Functional Rehabilitation Hospital of Tunis, and the validity of this intelligent control system had been proved.

Development of Laminar Plasma Shielded HF-ERW Process: Advanced Welding Process of HF-ERW 3

2012 ◽  
Author(s):  
Hideki Hamatani ◽  
Funinori Watanabe ◽  
Nobuo Mizuhashi ◽  
Sunao Takeuchi ◽  
Yoshiaki Hirota ◽  
...  
Keyword(s):  
High Temperature ◽  
Welding Process ◽  
Air Entrainment ◽  
Plasma Jets ◽  
Control Technique ◽  
Monitoring Methods ◽  
Line Pipe ◽  
Temperature State ◽  
Weld Area ◽  
Cold Gas

High frequency - electric resistance welded (HF-ERW) pipe has been successfully used for many years for a number of applications. The benefits of HF-ERW pipe are considerable, including a higher dimensional tolerance and lower prices than seamless pipe and UO pipe. The conventional weld seam produced by HF-ERW, however, often has a relatively low toughness. We have developed an automatic heat input control technique based on ERW phenomena that relies on optical and electrical monitoring methods and has been shown to result in a significant improvement in the toughness. Shielding of the weld area must also be considered as a key factor in the formation of a sound weld. It has been shown that an inert cold gas (e.g., at room temperature) shielding technique is effective for maintaining a stable low oxygen state in the weld area that inhibits the formation of penetrator, a pancake oxide inclusions. Compared to the cold gas shielding technique, high temperature gas shielding, due to its higher kinetic viscosity coefficient, should make it easier to sustain a higher laminar flow, thus leading to a rather low air entrainment in the shielding gas. In addition, plasma is a much higher temperature state (∼6000 K), and the dissociated gases can react with the entrained oxygen; plasma jets should, therefore, enhance the overall shielding effects. Moreover, oxides on the strip edges can be expected to melt and/or be reduced by the high temperature plasma jets. Nippon Steel has developed a plasma torch that can generate a long and wide laminar argon – nitrogen – (hydrogen) jet. This paper describes the results obtained from our investigation of the effects of a plasma jet shield on the weld area of high strength line pipe with a yield strength grade of X65. Preliminary attempts in applying this novel shielding technique has been found, as expected, to demonstrate extremely low numbers of weld defects and a good low temperature toughness of the HF-ERW seam.

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