Numerical simulation on surface deformation for rotating mirrors of ultra-high-speed photography

2007 ◽  
Author(s):  
Hongbin Huang ◽  
Jingzhen Li ◽  
Xiangdong Gong ◽  
Fengshan Sun ◽  
Bin Hui
Keyword(s):  
Numerical Simulation ◽  
High Speed ◽  
Surface Deformation ◽  
High Speed Photography ◽  
Ultra High Speed

scholarly journals Flash! Seeing the Unseen by Ultra-High Speed Photography

1942 ◽  
Vol 32 (5) ◽  
pp. 596
Author(s):  
Paul V. Trovillo ◽  
Harold E. Edgerton ◽  
James R. Killian
Keyword(s):  
High Speed ◽  
High Speed Photography ◽  
Ultra High Speed

Capacitor Discharge Weld Modelling Using Ultra High Speed Photography

1993 ◽  
Vol 314 ◽  
Author(s):  
R. D. Wilson ◽  
J. A. Hawk ◽  
J. H. Devletian
Keyword(s):  
High Speed ◽  
Welding Process ◽  
Travel Speed ◽  
Analytical Models ◽  
High Speed Photography ◽  
Welding Time ◽  
Capacitor Discharge ◽  
Ultra High Speed ◽  
High Cooling Rates ◽  
Weld Area

AbstractCapacitor discharge welding (CDW) is a rapid solidification joining process where high cooling rates (106 K/s) are obtained as a result of the large weld surface area to small weld volume. The objective of this study, directed by the U.S. Bureau of Mines and the Oregon Graduate Institute of Science and Technology, was to use ultra-high speed photography to quantify transient arc behavior during the CDW cycle. The simple cylindrical geometries of the CD welds have been used to formulate analytical models which are compared to the high speed photographs of the welding process. The high speed photographs were analyzed with respect to welding time and process weld variables and compared to predicted values from the analytical model. The detailed photographic analyses revealed that material is continuously ejected as a plasma from the weld area due to induced magnetic forces, rather than having the liquid metal squeezed out of the weld upon contact. It was found that welding time was controlled by tip length and drop height. Results from high speed photographs found the arc travel speed around tube welds to be 109m/s. Finally, the high speed photographs revealed that the velocity of arc propagation during ignition was fast enough to allow the CDW process to be modelled as onedimensional heat flow.

Experiment and Numerical Simulation of Extrudate Swell in the Polymer Extrusion Process

2011 ◽  
Vol 314-316 ◽  
pp. 401-404 ◽  
Author(s):  
Min Zhang ◽  
Chuan Zhen Huang ◽  
Guo Wen Chen ◽  
Yu Xi Jia
Keyword(s):  
Numerical Simulation ◽  
High Speed ◽  
Three Dimensional ◽  
Simulation Method ◽  
Extrusion Process ◽  
High Speed Photography ◽  
The Finite Element Method ◽  
Polymer Extrusion ◽  
Extrudate Swell ◽  
Rate Profile

The extrudate swell of the polymer extrusion process was studied with the experiment and simulation method. The extrudate swell process was recorded by the high-speed photography apparatus. The swell rate at the different time was calculated. It is found that the extrudate swell rate increase at the first five seconds. The maximum swell rate is about 4.37%. The three-dimensional numerical simulation model of the experiment die path was founded. The extrusion process including the extrudate swell was simulated used the Finite Element Method. Such simulated results as the velocity vector, the shear rate profile and the end of the swell zone were analyzed. The extrudate swell end got by the simulation is similar with the experiment result.

Air spark fiducial for ultra‐high‐speed photography

1973 ◽  
Vol 44 (11) ◽  
pp. 1630-1632 ◽  
Author(s):  
H. M. Graham ◽  
G. A. Leavitt
Keyword(s):  
High Speed ◽  
High Speed Photography ◽  
Ultra High Speed

Evaluation of Characteristics of Transonic Interfacial Fracture Phenomena Using Ultra-high Speed Photography

2000 ◽  
Vol 2000 (0) ◽  
pp. 229-230
Author(s):  
Toshihisa NISHIOKA ◽  
Hidemi MIYAUCHI ◽  
Takehiro FUJIMOTO ◽  
Keigo SAKAKURA
Keyword(s):  
High Speed ◽  
Interfacial Fracture ◽  
High Speed Photography ◽  
Ultra High Speed
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