Crack generation mechanism and control method of electron beam welded Nb/GH3128 joint

Quantitative studies of the phenomenon associated with reactions induced by the electron beam between specimens and gases present in the electron microscope require precise knowledge and control of the local environment experienced by the portion of the specimen in the electron beam. Because of outgassing phenomena, the environment at the irradiated portion of the specimen is very different from that in any place where gas pressures and compositions can be measured. We have found that differential pumping of the specimen chamber by a 4" Orb-Ion pump, following roughing by a zeolite sorption pump, can produce a specimen-chamber pressure 100- to 1000-fold less than that in the region below the objective lens.

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Perencanaan Pengendalian Kualitas Produk Pakaian Bayi dengan Metode Six Sigma Pada CV. AGP

JEMAP ◽

10.24167/jemap.v3i1.2632 ◽

2020 ◽

Vol 3 (1) ◽

Author(s):

Albertus Reynaldo Kurniawan ◽

Bayu Prestianto

Keyword(s):

Quality Control ◽

Continuous Improvement ◽

Six Sigma ◽

Screen Printing ◽

Control Method ◽

Operational Performance ◽

Machine Maintenance ◽

Quality Product ◽

Break Time ◽

And Control

Quality control becomes an important key for companies in suppressing the number of defective produced products. Six Sigma is a quality control method that aims to minimize defective products to the lowest point or achieve operational performance with a sigma value of 6 with only yielding 3.4 defective products of 1 million product. Stages of Six Sigma method starts from the DMAIC (Define, Measure, Analyze, Improve and Control) stages that help the company in improving quality and continuous improvement. Based on the results of research on baby clothes products, data in March 2018 the percentage of defective products produced reached 1.4% exceeding 1% tolerance limit, with a Sigma value of 4.14 meaning a possible defect product of 4033.39 opportunities per million products. In the pareto diagram there were 5 types of CTQ (Critical to Quality) such as oblique obras, blobor screen printing, there is a fabric / head cloth code on the final product, hollow fabric / thin fabric fiber, and dirty cloth. The factors caused quality problems such as Manpower, Materials, Environtment, and Machine. Suggestion for consideration of company improvement was continuous improvement on every existing quality problem like in Manpower factor namely improving comprehension, awareness of employees in producing quality product and improve employee's accuracy, Strength Quality Control and give break time. Materials by making the method of cutting the fabric head, the Machine by scheduling machine maintenance and the provision of needle containers at each employees desk sewing and better environtment by installing exhaust fan and renovating the production room.

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An Efficient Approach for Modeling and Control of a Quadrotor

Wasit Journal of Engineering Sciences ◽

10.31185/ejuow.vol4.iss2.44 ◽

2016 ◽

Vol 4 (2) ◽

pp. 1-16

Author(s):

Ahmed S. Khusheef

Keyword(s):

Pid Control ◽

Control Method ◽

Mechanical Design ◽

Loop Control ◽

Modeling And Control ◽

Loop Control System ◽

And Control ◽

Close Loop Control ◽

Close Loop Control System ◽

Made In

A quadrotor is a four-rotor aircraft capable of vertical take-off and landing, hovering, forward flight, and having great maneuverability. Its platform can be made in a small size make it convenient for indoor applications as well as for outdoor uses. In model there are four input forces that are essentially the thrust provided by each propeller attached to each motor with a fixed angle. The quadrotor is basically considered an unstable system because of the aerodynamic effects; consequently, a close-loop control system is required to achieve stability and autonomy. Such system must enable the quadrotor to reach the desired attitude as fast as possible without any steady state error. In this paper, an optimal controller is designed based on a Proportional Integral Derivative (PID) control method to obtain stability in flying the quadrotor. The dynamic model of this vehicle will be also explained by using Euler-Newton method. The mechanical design was performed along with the design of the controlling algorithm. Matlab Simulink was used to test and analyze the performance of the proposed control strategy. The experimental results on the quadrotor demonstrated the effectiveness of the methodology used.

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Application Study on Finger Joint Motion in Rehabilitation Training

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.644-650.879 ◽

2014 ◽

Vol 644-650 ◽

pp. 879-883

Author(s):

Jing Jing Yu

Keyword(s):

Control Method ◽

Finger Joint ◽

Continuous Passive Motion ◽

Joint Motion ◽

Joint Movement ◽

Rehabilitation Training ◽

Angle Data ◽

Finger Flexion ◽

And Control ◽

Flexion And Extension

In various forms of movement of finger rehabilitation training, Continuous Passive Motion (CPM) of single degree of freedom (1 DOF) has outstanding application value. Taking classic flexion and extension movement for instance, this study collected the joint angle data of finger flexion and extension motion by experiments and confirmed that the joint motion of finger are not independent of each other but there is certain rule. This paper studies the finger joint movement rule from qualitative and quantitative aspects, and the conclusion can guide the design of the mechanism and control method of finger rehabilitation training robot.

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Research on a Novel Vascular Interventional Surgery Robot and Control Method Based on Precise Delivery

IEEE Access ◽

10.1109/access.2021.3057425 ◽

2021 ◽

Vol 9 ◽

pp. 26568-26582

Author(s):

Hongbo Wang ◽

Jingyuan Chang ◽

Haoyang Yu ◽

Haiyang Liu ◽

Chao Hou ◽

...

Keyword(s):

Control Method ◽

Vascular Interventional Surgery ◽

And Control

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Optimization of a Small Wind Power Plant for Annual Wind Speed Distribution

Energies ◽

10.3390/en14061587 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1587

Author(s):

Krzysztof Wrobel ◽

Krzysztof Tomczewski ◽

Artur Sliwinski ◽

Andrzej Tomczewski

Keyword(s):

Wind Speed ◽

Power Plant ◽

Wind Power ◽

Power Plants ◽

Control Method ◽

Wind Power Plant ◽

Switched Reluctance ◽

Wind Speeds ◽

Wind Speed Distribution ◽

And Control

This article presents a method to adjust the elements of a small wind power plant to the wind speed characterized by the highest annual level of energy. Tests were carried out on the basis of annual wind distributions at three locations. The standard range of wind speeds was reduced to that resulting from the annual wind speed distributions in these locations. The construction of the generators and the method of their excitation were adapted to the characteristics of the turbines. The results obtained for the designed power plants were compared with those obtained for a power plant with a commercial turbine adapted to a wind speed of 10 mps. The generator structure and control method were optimized using a genetic algorithm in the MATLAB program (Mathworks, Natick, MA, USA); magnetostatic calculations were carried out using the FEMM program; the simulations were conducted using a proprietary simulation program. The simulation results were verified by measurement for a switched reluctance machine of the same voltage, power, and design. Finally, the yields of the designed generators in various locations were determined.

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An Guidance and Control Method with Feedforward Compensation for Target Tracking by Satellite

2020 Chinese Automation Congress (CAC) ◽

10.1109/cac51589.2020.9327751 ◽

2020 ◽

Author(s):

Ziyao Xu ◽

Peng Xu ◽

Rui Peng ◽

Qidong Lu ◽

Shengwen Li

Keyword(s):

Target Tracking ◽

Control Method ◽

Guidance And Control ◽

And Control

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THE EVALUATION OF SURFACE MORPHOLOGY USING FLEXURE GUIDED NANO-POSITIONING SYSTEM AND ULTRA-PRECISION LATHE

International Journal of Modern Physics Conference Series ◽

10.1142/s2010194512003133 ◽

2012 ◽

Vol 06 ◽

pp. 172-177

Author(s):

Nam-Su Kwak ◽

Jae-Yeol Kim

Keyword(s):

Surface Morphology ◽

Piezoelectric Actuator ◽

Control Method ◽

Positioning System ◽

Motion Error ◽

Precision Stage ◽

Cnc Lathe ◽

Single Crystal Diamond ◽

Ultra Precision ◽

And Control

In this study, piezoelectric actuator, Flexure guide, Power transmission element and control method and considered for Nano-positioning system apparatus. The main objectives of this thesis were to develop the 3-axis Ultra-precision stages which enable the 3-axis control by the manipulation of the piezoelectric actuator and to enhance the precision of the Ultra-Precision CNC lathe which is responsible for the ductile mode machining of the hardened-brittle material where the machining is based on the single crystal diamond. Ultra-precision CNC lathe is used for machining and motion error of the machine are compensated by using 3-axis Ultra-precision stage. Through the simulation and experiments on ultra-precision positioning, stability and priority on Nano-positioning system with 3-axis ultra-precision stage and control algorithm are secured by using NI Labview. And after applying the system, is to analyze the surface morphology of the mold steel (SKD61)

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Study and Implement on Key Technologies of Ship-Welding Mobile Robot

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.321 ◽

2010 ◽

Vol 44-47 ◽

pp. 321-325

Author(s):

Liang Hua ◽

Lin Lin Lv ◽

Ju Ping Gu ◽

Yu Jian Qiang

Keyword(s):

Mobile Robot ◽

Control Method ◽

Structure Design ◽

Seam Tracking ◽

Precision Positioning ◽

Positioning Control ◽

Controlling System ◽

Welding Torch ◽

Driven System ◽

And Control

The key technilogies of ship-welding mobile robot applied to ship-building in plane block production line were researched and realized. The mechanical structure design of the robot was completed. The motion-controlling system of of two-wheel differential driving mobile robot was developed. A novel precision positioning control method of welding torch using ultrasonic motors was putforward. The mechanism and control-driven system of precision positioning system for welding torch were completed. The platform of obstacle avoidance navigation system was designed and the strategies of seam tracking, trajectory and posture adjustment were preliminary studied. The methods and results put forward in the paper could act as the base of deep research on the theories and technologies of ship-welding mobile robot.

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