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FSI해석 및 실험을 통한 볼평형장치 내 볼과 유체의 거동 분석
강승규(Seungkyu Kang),김현우(Hyunwoo Kim),유완석(Wansuk Yoo),노경훈(Kyunghun Nho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The purpose of this paper is to analyze drag force and friction force between the ball and fluid in a ball balancer of washing machines. To add ball balancer model in the multibody washing machine modeling, fluid drag force and friction force should be required to complete dynamic modeling of washing machines. To match this goal, both computer simulation and real experiment are compared to accurately model the fluid drag force. Simulation results were compared to experimental results. A ball in an experimental tester had shown slightly different behavior depending on rotational acceleration of a jig. Results from analysis and test were in good agreements. After defining the drag force, the friction force which makes the ball stick on inner tube surface was obtained from high speed camera experiment.
Magic Formula 모델을 이용한 드럼세탁기용 마찰댐퍼의 동역학적 모델링과 해석
박진홍(Park, Jin-Hong),이정한(Lee, Jeong-Han),유완석(Yoo, Wan-Suk),노경훈(Nho, Gyung-Hun),정보선(Chung, Bo-Sun) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.10
In this paper, the magic formula model was applied for a friction damper in a drum-type washing machine. To describe characteristics of the hysteretic damping force, Physical tests were first carried out to get experimental results using an MTS machine. Then, parameters for the magic formula model were determined from the experimental curves. The ADAMS and MATLAB programs were used for the multibody modeling of the damper and process for parameter identification. The model of drum-type washing machine was applied for a dynamic model of friction damper, in which the accuracy of the proposed damper model was verified.
강승규(Seung Kyu Kang),이재욱(Jae Wook Lee),김현우(Hyun Woo Kim),유완석(Wan Suk Yoo),노경훈(Kyung Hun Nho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Washing machines have the rotational eccentricity because of its unbalanced mass, and it generates the vibration problems. If the vibration and noise becomes severe, it degrades the quality of products. To reduce vibration in a washing machine, a ball-balancer has installed. It is known to have the better performance than the other existing ones in vibration reduction. In this paper, we derived the equation of motion of ball-balancing system and defined the fluid drag force to make the dynamic system of washing machines having behavior of ball-balancing. An advanced high-speed camera with a spatial resolution of 10.68 ㎛ and 3,000 frames at 1280 × 1024 was employed to observe the ball-balancing system. The result from the visual test will be used to make the whole dynamic system of ball-balancing washing machines.