Experimental Study on Flow Pattern Characteristics in Micro-updip Pipeline Using High Speed Camera System

Kick-up phenomenon during looping is an important factor in thermosonic wire bonding. In this study, the loping process during wire bonding was recorded by using high-speed camera, and wire profiles evolution was obtained from images sequence by image processing method. With a polynomial fitting, the wire loop profiling was described by the curvature changing, and kick-up phenomenon on gold wire was found between the instant of 290th frame(0.0537s) to 380th frame (0.0703s), the change of curvature is divided into three phases, a looping phase, a mutation phase and a kick-up phase. While in the kick-up phase, the kick up phenomenon is the most obvious. These experimental results were useful for in-depth study of kick-up phenomenon by simulation.

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Experimental Study on the Response Characteristics of Oilcans under High-Velocity Fragment Impact

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.510.500 ◽

2012 ◽

Vol 510 ◽

pp. 500-506

Author(s):

Chang Hai Chen ◽

Xi Zhu ◽

Hai Liang Hou ◽

Li Jun Zhang ◽

Ting Tang

Keyword(s):

Experimental Study ◽

High Velocity ◽

High Speed ◽

Room Temperature ◽

Experimental Results ◽

Fuel Oil ◽

High Speed Camera ◽

Response Characteristics ◽

Fuel Oils ◽

The Impact

To explore the deflagration possibility of the warship cabin filled with fuel oil under impact of high-speed fragments in the condition of room temperature, experiments were carried out employing the small aluminium oilcans filled with fuel oil. Response processes of the oilcans were observed with the help of a high-speed camera. The disintegration as well as flying scattering of the oilcans were analyzed. The reasons for atomization of the fuel oils were presented. Finally, the deflagration possibility of warship oil cabin was analyzed. Results show that the pressure inside the oilcan is quite great under the impact of the high-speed fragment, which makes the oilcan disintegration and flying scattering. Simultaneously, fuel oils inside the oilcans are atomized quickly followed by ejected in front and back directions. Under the same condition as in present tests, deflagration will not occur for fuel oils used by warships. Experimental results will provide valuable references for the deflagration analysis of warship fuel oil cabins subjected to the impact of high-velocity fragments.

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Experimental investigation of the boundary condition of slewing beams using a high-speed camera system

Mechanism and Machine Theory ◽

10.1016/0094-114x(94)00058-s ◽

1995 ◽

Vol 30 (4) ◽

pp. 629-643 ◽

Cited By ~ 9

Author(s):

K.H. Low ◽

Michael W.S. Lau

Keyword(s):

Boundary Condition ◽

Experimental Investigation ◽

High Speed ◽

High Speed Camera ◽

Camera System

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Analysis of Cracking Processes of Sandstone in Rockburst Test

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.256-259.1052 ◽

2012 ◽

Vol 256-259 ◽

pp. 1052-1059

Author(s):

De Jian Li ◽

Fei Zhao ◽

Run Jie Ma ◽

Li Qiang Han ◽

Xiao Hu Wu

Keyword(s):

Growth Rate ◽

Fractal Dimension ◽

Crack Propagation ◽

High Speed ◽

Fractal Dimensions ◽

Rock Surface ◽

Horizontal Line ◽

High Speed Camera ◽

Camera System ◽

Very High

High speed camera system is used to record crack propagation on rock surface during the lab rocburst experiment. This paper presents the specific analytical method of crack propagation with high speed images. Crack propagation types and directions are briefly described, and the lengths, growth rate and fractal dimension of cracks are calculated. The results show that the crack grows mainly along the horizontal line on the unloading surface, at a low speed before rockburst and reaches a very high speed abruptly near the burst point. The fractal dimensions demonstrated that the crack turns to be rough when rockburst happens. The study on the crack propagation is benefit to the understanding on the mechanism of rockburst.

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Testing and Analysis of High-Speed Camera for Droplet Transition

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.271-273.79 ◽

2011 ◽

Vol 271-273 ◽

pp. 79-83 ◽

Cited By ~ 1

Author(s):

Yuan Mei Wen ◽

Shi Sheng Huang ◽

Gui Xiong Liu

Keyword(s):

Arc Welding ◽

High Speed ◽

High Speed Camera ◽

Gravity Center ◽

Camera System ◽

Molten Droplet ◽

Electrical Arc ◽

Complicated Process ◽

Welding Metal ◽

Droplet Transition

The droplet transition of electrical arc welding is a complicated process that combines heat, mass and momentum transfer. A high-speed camera system with laser in the background is established to observe the fast changing process of molten droplet transition. A group of high-speed camera pictures which indicate the droplet gravity center is unstable in welding metal transfer process are taken and analyzed. The experimental results show that the electromagnetic force is the unstable root of the droplet gravity center.

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Development of a test method and experimental study on cable unwinding

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406220954498 ◽

2020 ◽

pp. 095440622095449

Author(s):

Ji-Heon Kang ◽

Kun-Woo Kim ◽

Jae-Wook Lee ◽

Yong-Jae Cho ◽

Jin-Seok Jang

Keyword(s):

Experimental Study ◽

Textile Industry ◽

High Speed ◽

Translational Motion ◽

Control Device ◽

Test Method ◽

Experimental Device ◽

High Speed Camera

In addition to the textile industry, unwinding of cable or fiber is used in various fields such as electronics, communication, and guided weapons. The cable released from the package exhibit a complicated behavior, entailing a combination of rotational and translational motion. This causes problems such as entangling and fracture. Therefore, it is necessary to study boundary and adhesion conditions to prevent unwinding failure. In this study, an experimental device for the analysis of cable unwinding was developed, and unwinding behavior was analyzed experimentally under various unwinding conditions. The experimental device comprises a jig for high-speed camera measurements, control device, and cable unwinding device. Cable behavior was analyzed according to the unwinding velocity and the distance between the fiber package and the point where the fiber was released. In addition, unwinding behavior with respect of the tension acting on the cable was analyzed experimentally by applying the adhesive.

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