Circular Grid System — A Valuable Aid for Evaluating Sheet Metal Formability

1968 ◽  
Author(s):  
Stuart P. Keeler
Keyword(s):  
Sheet Metal ◽  
Grid System ◽  
System A ◽  
Circular Grid

scholarly journals Discrete Vortex Prediction of Flows around a Cylinder Near a Wall Using Overlapping Grid System

Fluids ◽  
2021 ◽  
Vol 6 (6) ◽  
pp. 211
Author(s):  
Wisnu Wardhana ◽  
Ede Mehta Wardhana ◽  
Meitha Soetardjo
Keyword(s):  
Grid Point ◽  
The Body ◽  
Cylinder Surface ◽  
Grid System ◽  
Vortex Interaction ◽  
Discrete Vortex ◽  
Cpu Time ◽  
Comparison Of The Results ◽  
Circular Grid ◽  
Interaction Velocity

Modelling of unidirectional and oscillatory flows around a cylinder near a wall using an overlapping grid system is carried out. The circular grid system of the cylinder was overlapped with the rectangular grid system of the wall. The use of such an overlapping grid system is intended to reduce the CPU time compared to the cloud scheme in which vortex-to-vortex interaction is used, i.e., especially in calculating the shedding vortex velocity, since calculating the vortices velocity takes the longest CPU time. This method is not only time efficient, but also gives a better distribution of surface vorticity as the scattered vortices around the body are now concentrated on a grid point. Therefore, grid-to-grid interaction is used instead of vortex-to-vortex interaction. Velocity calculation was also carried out using this overlapping grid in which the new incremental shift position was summed up to obtain the total new vortices position. The engineering applications of this topic are to simulate the loading of submarine pipeline placed close to the seabed or to simulate the flow as a result of the scouring process below the cylinder since there is space for the fluid to flow beneath it. The in-line and transverse force coefficients are found by integrating the pressure around the cylinder surface. The flow patterns are then obtained and presented. The comparison of the results with experimental evidence is presented and the range of good results is discussed.

scholarly journals A Hardware Testbed of Grid-Connected Wind-Solar Power System.

2019 ◽  
Vol 1 (2) ◽  
pp. 52-56
Author(s):  
Aryuanto Soetedjo ◽  
Abraham Lomi ◽  
Bayu Jaya PUSPITA
Keyword(s):  
Power System ◽  
Wind Power ◽  
Solar Power ◽  
Halogen Lamp ◽  
Grid System ◽  
Solar Simulator ◽  
Hybrid Power ◽  
System A ◽  
Wind Power System ◽  
Real Hardware

This paper presents the development of hardware testbed for implementing grid connected wind-solar power system. A solar simulator using halogen lamp is employed to simulate the sun irradiation. The wind power simulator is developed by coupling the DC motor and the DC generator. A grid tie inverter is employed to connect the power from the solar and wind power system with the grid system. The experimental results show that the developed testbed could be used for testing the hybrid power system in the real hardware.

Distributed Renewable Energy Access to Micro-Grid System Random Multi-Objective Economic Dispatch

2014 ◽  
Vol 651-653 ◽  
pp. 1037-1045
Author(s):  
Ming Xu ◽  
Wen Bin Xiang
Keyword(s):  
Renewable Energy ◽  
Economic Dispatch ◽  
Grid System ◽  
Energy Access ◽  
Multi Objective ◽  
System A ◽  
Simulink Simulation ◽  
Dispatch System ◽  
Micro Grid ◽  
Generation Technology

With the development of distributed generation technology rapidly, a large number of wind, solar and other renewable energy access to access system . Since renewable energy is intermittent and stochastic, which posed economic dispatch system a serious challenge. Consider the system operating costs and sewage expenses, the paper constructs multi-objective micro-grid system economic dispatch model composed by the wind turbine, diesel engine, battery and load. And through MATLAB / Simulink simulation, model is established to verify the correctness and effectiveness.

scholarly journals DESIGN OF A CLOSE-UP STEREO VISION BASED SHEET METAL INSPECTION SYSTEM

2011 ◽  
Author(s):  
M. S. Goldstein ◽  
J. P. Mitchell ◽  
R. V. Fleisig ◽  
A. D. Spence
Keyword(s):  
Sheet Metal ◽  
Electrochemical Etching ◽  
Three Dimensional ◽  
Strain Analysis ◽  
Inspection System ◽  
Grid Pattern ◽  
System A ◽  
Dimensional Reconstruction ◽  
Geometry Inspection ◽  
Achievable Accuracy

This paper describes the design and implementation of a close-up stereo computer vision based sheet metal strain and geometry inspection system. A square grid pattern is first applied to the part using either electrochemical etching or screen printing. The part is formed, and measured using a two camera sensor that can be attached to a CMM or FARO arm. Image processing is used to extract the corners of the deformed grid for either three dimensional reconstruction, or for strain analysis. Graphical results are conveniently displayed using HOOPS. Sample measurements using both steel and aluminum test domes indicate an achievable accuracy comparable to other systems.

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