Papers by Keyword: High Speed Camera

Abstract: In recent years, electronic devices have become lighter, thinner, shorter, smaller, and more multifunctional, driving advancements in drilling technologies. To meet the demands of electronic applications, this study proposes a drilling machine tool with a counterbalanced vibration control mechanism. In this study, machining experiments were conducted using a machine tool equipped with a left-right ball screw counterbalance mechanism during the step operation. Observations were made with a high-speed camera and a thermal camera, followed by examinations of the drill and holes after machining. As a result, significant findings regarding the drill tip temperature and runout were obtained. It was also confirmed that drill wear and runout affect machining quality.

Abstract: The research aim is to study and analyze the shear zone by application of merchant circle during machining of titanium alloy (Ti6Al4V). The thermo-mechanical reaction during machining plays an important role in defining machinability of titanium alloys. The scientific community is concerned about machining of titanium alloy due to problems occurring in the shear zone that affect tool life. Studying the cutting action contributes to understanding and addressing these problems effectively. For this purpose, an experimental setup, utilizing a high speed camera will be used to study the shear zone. The shear zone characteristics are studied by analyzing the images captured by a high speed camera placed near to the shear zone during machining. The experimental design consists of conducting a series of turning trials using combination of cutting parameters namely constant spindle speed (n) 770 rpm; feed rate (f) of 2 and 4 mm/rev; and depth of cut (d) of 1 and 2 mm. The length of cut (L) of 10 mm remains constant and no coolant is used for all trials. The images obtained from the camera are analyzed against the theory of orthogonal cutting using merchants circle.

Abstract: The paper presents the results of milling tests of aluminum alloy with a sintered carbide tool. For selected sets of cutting data, the thin wall deformation of the workpieces was analyzed. Theoretical calculations were compared with the experimental measurements, using the high speed camera and FEM analysis.

Abstract: Welding used as a material connecting technology is widely applied in the manufacture and plays an important role. At present the rapid development of our country's manufacture results in the requirements of higher and higher welding quality. The advanced data analysis system was used in the welding process, to obtain parameters which were able to reflect the characteristics of welding process. On that basis, the parameters of welding process can be optimized and then offer help to improve the welding quality. The data analysis systems designed in this paper can be used in analyzing electrical signals, high-speed camera images and spectral data in the welding. This data analysis system provided a wide range of functions, such as: mapping of voltage and current waveforms, U-I curve, probability density curves of voltage and current, voltage and current filtering, calculation of short-circuit frequency, short-cycle variance and shot droplet transfer cycle variance, the importation of energy and integral of the spectrum intensity, analyzing the relevance of the electrical signals, playing multi-information of arc synchronously. In the experiment of pulsed MAG welding and laser-pulse MAG welding, the system was used in comparing the multi-information of the arc and its function was absolutely embodied.

Abstract: The article presents the method for the determination of energy characteristics of the pneumatic cannon by means of high speed imaging. The gun tested is a device enabling bird collision endurance tests to be conducted for the structural element of aircrafts. In the tested 250 [m system, the projectiles were thrown in the plastic sabot damaged in the muzzle of the gun. The tests were conducted in the speed ranging between 100 300 m/s for 0.9 and 3.6 [k projectiles. The objective of the tests was to determine the characteristics of the projectile outlet velocity in the feed pressure function. The measurement stand was equipped with the Phantom V310 high speed camera The speed measurement was conducted with the use of the digital image analysis in which commercial TEMA Motion software was used. Results were corrected so that the parallax error could be eliminated. Because of the cylindrical shape of the projectile, the parallax error for the front at the back of the projectile varied, which required two correction coefficients to be applied. The speed was calculated by the averaging of the results for the front and the back of the projectile. For the recordings, in which the remaining of the sabot prevented the accurate arrangement of measurement points, a simplified speed measurement method was used. Measurement uncertainty sources are also described (shift of the projectile at the time of the exposure, measurement point positioning error). The influence of the parallax error on the measurement result and the cannon energy characteristics obtained are presented. The obtained characteristics enable proper selection of feed pressure allowing for the procurement of the outlet velocity suitable for the tests conducted.

Abstract: The aim of the examination was to determine characteristics of the dynamic movement of the impact cylinder in the function of supply pressure and capacity of the chamber of the accumulator.

Abstract: This work is related to reliability of strain measurement in flexible printed circuit boards (fPCBs) made with polyimide substrate. It was observed that the fPCBs are very sensitive to strain mounting stiffness. The indirect measurement method will be done employing High Speed Camera (HSP). The direct method will be formulated in two ways: 1) conventional strain gauge glued in an fPCBs; 2) printed strain gauge in a polyimide substrate. This paper will point out mistakes and show advantages when using different method to extract the deformation field of the selected area in a flexible thin film.

Abstract: The short description of the new approach to the pneumatic powder injection process analysis was presented in the article. The experiments with the high speed camera recording of the two-phase jet in pneumatic powder injection process were carried out in the Department of Foundry, Silesian University of Technology, Poland. The results were briefly analyzed and some interesting conclusions appeared, especially that the real velocity of the injected particles is far less than it is normally calculated with use of the well-known formulas. They were compared with existing literature data as well as with some experimentspreviously made by authors. Powder particles velocity and two-phase jet mass concentration were analyzed as the most important parameters for powder injection process. The results described are part of the complex experimental plan and the next step is computer modeling (just launched) of the jet introducing liquid.

Abstract: This paper used high speed camera and computer as well as other modern technological means to analysis and study high jump technique of those domestic and foreign male high-jumpers. We analysed the differences between the high jump technique of different athletes from the run-up, the swing to the kicking and the takeoff, which was combined with mechanics analysis on the high jump. The analysis of the high jump technique based on the movement mechanics analysis method played an important role for athletes to improve sports skills and show the best sports posture. The purpose of this paper was to find out the gap between domestic and foreign players based on mechanical analysis of the sports by scientific analysis, and to make correct technology diagnosis thus providing scientific theory for athletes' scientific training, so as to promote the development of the sport.

Abstract: Liquid sloshing is any motion of free liquid surface inside its container. Sloshing may generate hydrodynamics loads that can be dangerous to structural integrity and stability of moving container. In this study, liquid sloshing in cubical and cylindrical containers with similar characteristic length were investigated. The containers with liquid inside were excited sinusoidally by using an electrodynamics shaker while the free liquid surface level change was captured by using high speed camera. The highest free liquid surface level difference obtained for cylindrical and cubical containers were compared. Results show that cylindrical containers produce less liquid sloshing and thus more suitable to be used for liquid transportation.