http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kailash Dhital(카일라시 디탈),Jae-Hung Han(한재흥),Yoon-Kyu Lee(이윤규) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
The present study considers the usage of concentrated force to simulate panel flutter. This idea has been validated for studying the flutter of wing structure in subsonic flow, yet its application in the supersonic region remained to be explored. In that context, a simply supported panel subjected to forces, equivalent to aerodynamic force is used for studying supersonic panel flutter. The distributed aerodynamic force is approximated to few concentrated forces by taking numerical integration. The aeroelastic equation is formulated using classical small-deflection theory and piston theory in linear panel flutter whereas for emulated panel flutter the flutter equation is derived by replacing the pressure due to aerodynamic loading with pressure from concentrated loading. Finally, critical flutter frequency, critical dynamic pressure, and corresponding mode shape are found for emulated panel flutter and compared with linear panel flutter. Two important parameters, the number of concentrated forces and their location are discussed through numerical examples and optimization process respectively. So far, the flutter results acquired in this study are reasonable to explain the feasibility of reproducing panel flutter using concentrated forces.
Dynamic balancing of planar mechanisms using genetic algorithm
Kailash Chaudhary,Himanshu Chaudhary 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
This paper presents an optimization technique to dynamically balance the planar mechanisms in which the shaking forces and shakingmoments are minimized using the genetic algorithm (GA). A dynamically equivalent system of point-masses that represents each rigidlink of a mechanism is developed to represent link’s inertial properties. The shaking force and shaking moment are then expressed interms of the point-mass parameters which are taken as the design variables. These design variables are brought into the optimizationscheme to reduce the shaking force and shaking moment. This formulates the objective function which optimizes the mass distribution ofeach link. First, the problem is formulated as a single objective optimization problem for which the genetic algorithm produces betterresults as compared to the conventional optimization algorithm. The same problem is then formulated as a multi-objective optimizationproblem and multiple optimal solutions are created as a Pareto front by using the genetic algorithm. The masses and inertias of the optimizedlinks are computed from the optimized design variables. The effectiveness of the proposed methodology is shown by applying it toa standard problem of four-bar planar mechanism available in the literature.
Kailash Chand Kurdia,Ambuj Aggarwal,Cherring Tandup,Divya Dahiya,Subrata Podder,Arunanshu Behera 한국간담췌외과학회 2021 Annals of hepato-biliary-pancreatic surgery Vol.25 No.2
Extrahepatic portal venous obstruction (EHPVO) and temporomandibular joint (TMJ) ankylosisis are significant problems in Asian countries. Both EHPVO and bilateral TMJ ankylosis may have rare association due to protein C and S deficiency which may cause hypercoagulability as well as reduced fibrinolytic activity. Ankylosis arising in early childhood is associated with facial asymmetry, feeding difficulty and speech development alterations. It is also associated with great challenges of endoscopic management in extra hepatic portal vein obstruction (EHPVO) with variceal bleed as well as air way management during surgical management and post-operative recovery. Recently a case series had shown association of TMJ ankylosis with EHPVO due to protein C deficiency which might be an etiological factor for both EHPVO as well as TMJ ankylosis. This case report documents a case of 14 year young girl who had TMJ ankylosis due to ear infection and EHPVO with esophageal varices had multiple episodes of upper GI bleed with mild deficiency of protein C and S, successfully managed with proximal splenorenal shunt to prevent further episodes of upper GI bleed, as endoscopic management is not feasible due to TMJ ankylosis.