scholarly journals Electric hybrid control method of assembly line robot based on PLC

2020 ◽  
Vol 24 (3 Part A) ◽  
pp. 1505-1511
Author(s):  
Zhenjie Ding ◽  
Yuqiu Li ◽  
Zhengxing Zhang
Keyword(s):  
Production Efficiency ◽  
Assembly Line ◽  
Control Method ◽  
Hybrid Control ◽  
Comparison Method ◽  
Mechanical Equipment ◽  
Programmable Logic ◽  
Positioning Device ◽  
Significant Performance ◽  
Mixing Control

With the development of modern industry, manipulators have become a kind of mechanical equipment widely used in assembly lines, which not only can improve production efficiency and product quality, but also improve working conditions. Taking the polar co-ordinate manipulator in the automated assembly line as the research object, the programmable logic contoller (PLC) based assembly line manipulator electrical hybrid control method is analyzed. The assembly line robot includes the base, the stepping motor to drive the rotation of the waist, the cylinder controlled arm and the gripper, based on the polar co-ordinate manipulator action requirements, FX2N series programmable logic contoller is selected to analyze programmable logic contoller based stepper motor, pneumatic servo positioning device, pitch cylinder and gripper control method in detail. The components of the assembly line manipulator are organically combined by programmable logic contoller to realize the electrical mixing control of the assembly line manipulator. The experimental results show that the assembly success rate and breakage rate of the assembly line robot controlled by the proposed method are 99.25% and 0.85%, respectively. The transmission performance and anti-noise performance are better than the comparison method, compared with the traditional method, this method has significant performance advantages in control accuracy, cost, practicability and so on and it has a good application prospect.

A Novel Real-Time Thermal Analysis and Layer Time Control Framework for Large Scale Additive Manufacturing

2020 ◽  
Author(s):  
Sepehr Fathizadan ◽  
Feng Ju ◽  
Kyle Rowe ◽  
Alex Fiechter ◽  
Nils Hofmann
Keyword(s):  
Additive Manufacturing ◽  
Surface Temperature ◽  
Real Time ◽  
Large Scale ◽  
Production Efficiency ◽  
Control Method ◽  
Data Extraction ◽  
Critical Role ◽  
Imaging Data ◽  
Time Data

Abstract Production efficiency and product quality need to be addressed simultaneously to ensure the reliability of large scale additive manufacturing. Specifically, print surface temperature plays a critical role in determining the quality characteristics of the product. Moreover, heat transfer via conduction as a result of spatial correlation between locations on the surface of large and complex geometries necessitates the employment of more robust methodologies to extract and monitor the data. In this paper, we propose a framework for real-time data extraction from thermal images as well as a novel method for controlling layer time during the printing process. A FLIR™ thermal camera captures and stores the stream of images from the print surface temperature while the Thermwood Large Scale Additive Manufacturing (LSAM™) machine is printing components. A set of digital image processing tasks were performed to extract the thermal data. Separate regression models based on real-time thermal imaging data are built on each location on the surface to predict the associated temperatures. Subsequently, a control method is proposed to find the best time for printing the next layer given the predictions. Finally, several scenarios based on the cooling dynamics of surface structure were defined and analyzed, and the results were compared to the current fixed layer time policy. It was concluded that the proposed method can significantly increase the efficiency by reducing the overall printing time while preserving the quality.

Recent Developments in the Ironfounding Industry

1972 ◽  
Vol 186 (1) ◽  
pp. 149-168
Author(s):  
H. Morrogh
Keyword(s):  
Capital Investment ◽  
Production Efficiency ◽  
Cumulative Effect ◽  
Spheroidal Graphite ◽  
Mechanical Equipment ◽  
Cast Irons ◽  
Delivery Times ◽  
Iron Castings ◽  
Wide Range ◽  
Recent Developments

Iron castings are in extensive use throughout engineering construction and are available in a wide range of properties, casting size and complexity. Ironfounding is in part associated with a particular industry—the ironfounding industry—and is in part a production engineering technique adopted by firms, their designers and engineers, on the basis of its process and product merits compared with those of other techniques. The changing pattern of manufacture and competition from other techniques is having important influences on the structure and capacity of industry producing iron castings. Additionally, the repeated cycles of business recession may result in the disappearance of the facilities for the production of certain types of foundry product. Although most recent developments in ironfounding are a continuation of trends which could be discerned or forecast a long time ago, the cumulative effect of these changes has been to revolutionize completely some aspects of the process of iron casting. The range of cast irons has been somewhat increased in recent years by addition to the variety of spheroidal graphite (s.g.) irons, malleable irons and alloy cast irons available. Most of the recent developments in ironfounding have, however, been concerned with improving production efficiency and the introduction of new melting, moulding and coremaking processes, enabling the ironfounder to provide the engineer and designer with a better service—maintaining prices at low level, improving dimensional accuracy and casting soundness with reduced delivery times. This has been achieved by the increased use of scrap made possible by developments in melting furnaces and molten metal treatment, by the introduction of new and improved moulding machinery and by the adoption of new methods of bonding sand used for moulds and cores, replacing many traditional techniques. These changes have had their influence equally in the large, highly mechanized mass-production foundries and in the jobbing foundries catering for short run work. An ironfoundry is an extremely exacting environment for mechanical equipment and for all control engineering. For this reason automatic moulding and other foundry plant need special design and robust construction. Most mechanized foundry plant of an automatic character represents a high capital investment which must run for long periods without breakdown, requiring long orders and work of a repetitive character.

A novel multi-mode hybrid control method for cooperative driving of an automated vehicle platoon

2020 ◽  
pp. 1-1
Author(s):  
Yulin Ma ◽  
Zhixiong Li ◽  
Reza Malekian ◽  
Sifa Zheng ◽  
Miguel Angel Sotelo
Keyword(s):  
Control Method ◽  
Hybrid Control ◽  
Automated Vehicle ◽  
Cooperative Driving ◽  
Vehicle Platoon ◽  
Multi Mode

scholarly journals Design Methodology of Tightly Regulated Dual-Output LLC Resonant Converter Using PFM-APWM Hybrid Control Method

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2146
Author(s):  
HwaPyeong Park ◽  
Mina Kim ◽  
HakSun Kim ◽  
JeeHoon Jung
Keyword(s):  
Design Methodology ◽  
Control Method ◽  
Hybrid Control ◽  
Pulse Frequency ◽  
Voltage Regulation ◽  
Resonant Converter ◽  
Pulse Frequency Modulation ◽  
Load Range ◽  
Worst Case ◽  
Llc Resonant Converter

A dual-output LLC resonant converter using pulse frequency modulation (PFM) and asymmetrical pulse width modulation (APWM) can achieve tight output voltage regulation, high power density, and high cost-effectiveness. However, an improper resonant tank design cannot achieve tight cross regulation of the dual-output channels at the worst-case load conditions. In addition, proper magnetizing inductance is required to achieve zero voltage switching (ZVS) of the power MOSFETs in the LLC resonant converter. In this paper, voltage gain of modulation methods and steady state operations are analyzed to implement the hybrid control method. In addition, the operation of the hybrid control algorithm is analyzed to achieve tight cross regulation performance. From this analysis, the design methodology of the resonant tank and the magnetizing inductance are proposed to compensate the output error of both outputs and to achieve ZVS over the entire load range. The cross regulation performance is verified with simulation and experimental results using a 190 W prototype converter.

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