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엑체로켓 엔진 조립과정에서의 기밀시험 방법에 대한 연구
김상호(Sang-ho Kim),박순영(Soon-young Park),김옥구(Ok-koo Kim),조원국(Won-kook Cho) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.5
기밀시험은 유체 또는 기체를 활용하여 유압시스템의 누설률 및 누설위치를 파악하는 비파괴 검사의 하나이다. 기밀시험 방법들은 다양하고 각 방법들마다 적합한 유체 및 기체의 종류가 있으며, 누설 탐지 정밀도, 소요되는 비용, 시간 등이 상이하다. 이에 따라 액체로켓 엔진의 조립과정에 적합한 기밀시험법을 시행하는 것이 중요하다. 본 연구에서는 액체로켓 엔진의 조립과정에 적용할 수 있는 다양한 기밀시험법들과 실제 엔진의 기밀시험법을 소개하였다. 최종적으로 액체로켓 엔진에 적합한 기밀시험 절차를 제안하였다. Leak Testing Method is one of nondestructive test methods using fluid or gas to measure the leakage level of a certain pneumo-hydraulic system as well as to detect the location of a leakage point. There are various fluids and gases that are suitable for each methods. According to the each method, the leak detection sensitivity, consuming costs, and required time could be differed. Therefore, it is important to select a proper leak testing method for the liquid propellent rocket engine which can be applicable during the assembling process of a liquid propellant rocket engine. In this study, various leak testing methods were compared that can be applicable for the assembling process of a liquid rocket engine. Furthermore, leak testing methods of existing engine are introduced. Finally, general guideline and process of the leak testing method for the engine was proposed.
화합물 반도체 본딩용 Spin Coater Module의 동특성 평가
강재훈(Jae Hoon Kang),송준엽(Jun Yeob Song),김옥구(Ok Koo Kim) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.6
Spin coater is regarded as a major module rotating at high speed to be used build up polymer resin thin film layer for bonding process of GaAs wafer. This module is consisted of spin unit for spreading uniformly, align device, resin spreading nozzle and et al. Specially, spin unit which is a component of module can cause to vibrate and finally affect to the uniformity of polymer resin film layer. For the stability prediction of rotation velocity and uniformity of polymer resin film layer, it is very important to understand the dynamic characteristics of assembled spin coater module and the dynamic response mode resulted from rotation behavier of spin chuck. In this paper, stress concentration mode and the deformed shape of spin chuck generated due to angular acceleration process are presented using analytical method for evaluation of structural safety according to the revolution speed variation of spin unit. And also, deformation form of GaAs wafer due to dynamic behavior of spin chuck is presented for the comparison of former simulated results.
송준엽(Jun Yeob Song),강재훈(Jae Hun Kang),김옥구(Ok Koo Kim),김태형(Tae Hyung Kim) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.7
Recently, the high-speed and intelligence technology of machine tools are developed for the high efficiency of productivity. Under the operating condition from the high-speed of machine tools, the various failure modes can occur in core units of manufacturing system. Therefore it is for the reliability concept of machine tool to be required in a design level. And the above-stated technology must be accommodated in the feeding and spindle subsystem, etc those are the core units of machine tools. In this study, we are developed the test-bed of sliding cover (C-plate) in order to evaluating reliability and estimating failure modes of feeding subsystem under operating conditions. The reliability experiment using the developed test-bed and the additional structural analysis executed on single and double structure. We found out the weak parts of sliding cover and were able to predict a life cycle from the experiment results. In this study, we propose the new C-plate model with double link structure to apply the high-speed machine tool in the fundamental guideline.
張仁植,金玉求 홍익대학교 산업기술연구소 2002 産業技術 Vol.12 No.-
Model parameter updating procedure using a structural model is based on the discrepancies between analytical and experimental results. In this paper, several beam models are utilized to detect modal frequency differences and errors in physical parameters, Young's modulus and mass density, are calculated using the differences. Impact test is carried out for simple beam and beams with 1, 3, 7 holes to obtain natural frequencies and mode shapes. Updated parameters are compared with those of analytical model to check the effect of the holes. The results show that the beam with holes become weak because of the effect of the holes. The results of this research can be used to calculate the updated mass and stiffness matrices to update modal data.