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리니어 압축기의 동적거동예측 Simulation Tool 개발
전수홍(Soo-hong Jeon),이효재(Hyo-jae Lee),정의봉(Weui-bong Jeong) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
A linear compressor used in a refrigerator has higher energy efficiency than a reciprocating compressor. But its vibration level is still severe than others. The vibration level of linear compressor at the frequency of 60㎐ is dominant since it is the exciting frequency of a motor. Experimental approach to reduce the vibration needs much effort and long period. In this paper, simulation tool to predict the vibration of the shell of the linear compressor was developed. The piston, body and shell are assumed to be rigid, while the loop pipe is flexible. The results by the developed tool showed good agreements with those by experiments.
수중폭발에 의한 원통형 배열센서의 구조 응답 및 안정성 해석
전수홍(Jeon, Soo-Hong),홍진숙(Hong, Chin-Suk),정의봉(Jeong, Weui-Bong),서희선(Seo, Hee-Seon),조요한(Cho, Yo-Han) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.1
This paper establishes a modeling and simulation procedure for structural response and reliability of a cylindrical array sensor on submarines under the shock generated by underwater explosion. The structural reliability of SONAR is important because the submarine could get out of combat ability by the structural damage of the SONAR upon explosion. A cylindrical array sensor was first modeled using the finite element method. Modal analysis was then performed for the check of the reliability of the modeling. The shock resistance simulations were performed for the responses to the structural shock waves and for the responses to the directly applied underwater shock waves, according to BV-043 and MIL-STD-901D, respectively. The stresses of the structure were evaluated with von-Mises scheme. Vulnerable regions were exposed through mapping the maximum stress to the structural model. Maximum stress of the SONAR was compared with the yield stress of the material to examine the structural reliability.
최기수(Ki-Soo Choi),전수홍(Soo-Hong Jeon),정의봉(Weui Bong Jeong) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Fast Fourier Transformation(FFT) is one of the most useful way to analyze response signal for the purpose of grasping the dynamic characteristics of system. Vibration test using impact hammer is typical and simple experimental method widely used for catching hold of dynamic peculiar characters and modal behaviors of system. In this thesis, impact testing module for NI-PXI equipment is developed The analyzing and visualizing module are developed with LabVIEW tool. A user can see quickly and easily modal shape of system after analyzing acquired data. This developed module will be expected to build up more convenient and serviceable measurement system.