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정지수,손정현,김찬중,Jin-Hong Park 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
Top loader washing machines are composed of an outer tub, inner drum, actuator and suspension with spring and dampers. When the drum rotates at a high speed, clothes are attached to the inner wall of the inner drum and the centrifugal force due to the unbalance mass makes a vibrating motion. In this study, the dynamic model of top loader washing machine was established to analyze the vibrating characteristics of the washing machine due to the unbalance mass effect and the mass effect of the fluid balancer. An integrated model of RecurDyn and Particleworks was made and used to analyze the dynamic behavior of the washing machine. The vibrating amount of the washing machine according to the position of the unbalance mass and its magnitude was analyzed. The accuracy of the dynamic model was verified by comparisons of the analysis results with experiments. By using the modal coordinates for the flexible multibody model, it was noted that the vibration of the top-loader washing machine was due to the deformation of the drum by unbalance masses.
2 면 밸란싱 기법을 이용한 드럼 세탁기 불평형 질량 예측
정원영(Wonyeong Jeong),장건희(Gunhee Jang),박재석(Jaeseuk Park) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
In front loading washing machines, accurate estimation of unbalance mass is always required to achieve high speed spinning operations. This paper proposes an estimation method of unbalance mass including their magnitude and angular location in front loading washing machines using two plane influence coefficient method. An ADAMS dynamic analysis model of a front loading washing machine was developed and vibration experiment was conducted to estimate angular position of unbalance mass at each plane. Estimated results from analysis and experiment were verified by comparing the actual angular position of unbalance mass. This research shows that two plane influence coefficient method are appropriate to estimate an angular position of unbalance mass in front load washing machines.
A Practical Method of Balancing a Rigid Rotor
Hua Su,Kil To Chong 한국정밀공학회 2006 International Journal of Precision Engineering and Vol.7 No.2
Diagnosis and repair tasks of an unbalanced rigid rotor reduce the chances of unexpected failure and the consequent losses in production, time, and money. This paper presents investigation of a balancing system for equilibration of rigid rotor unbalance. A practical vibration signal based method is developed for unbalance diagnosis using wavelet technology and a Lissajous diagram. This paper shows that a mass unbalance can be efficiently estimated through an appropriate narrow-band filter used to extract the required spectra component. The wavelet technology is used to design specified narrow filter bank. A modified Lissajous diagram is also introduced with statistical analysis to compute the phase position. Several experimental tests demonstrate the effectiveness in balancing the mass unbalance of a rigid rotor.
A Practical Method of Balancing a Rigid Rotor
Su, Hua,Chong, Kil-To Korean Society for Precision Engineering 2006 International Journal of Precision Engineering and Vol.7 No.2
Diagnosis and repair tasks of an unbalanced rigid rotor reduce the chances of unexpected failure and the consequent losses in production, time, and money. This paper presents investigation of a balancing system for equilibration of rigid rotor unbalance. A practical vibration signal based method is developed for unbalance diagnosis using wavelet technology and a Lissajous diagram. This paper shows that a mass unbalance can be efficiently estimated through an appropriate narrow-band filter used to extract the required spectra component. The wavelet technology is used to design specified narrow filter bank. A modified Lissajous diagram is also introduced with statistical analysis to compute the phase position. Several experimental tests demonstrate the effectiveness in balancing the mass unbalance of a rigid rotor.
ADAMS<SUP>®</SUP>를 이용한 초고속 스핀들의 회전 밸런싱(Balancing)에 대한 연구
조영덕(Y. D. Cho),정원지(W. J. Chung),이춘만(C. M. Lee),윤상환(S. H. Yoon),황영국(Y. K. Whang),박기범(G. B. Park) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
According to the demand of the high productivity, the interest of manufacturing skills is growing in industrial society. Especially the high-speed spindle in machining center becomes important these days. The rotating accuracy of the spindle in machining center concerns the centrifugal force. In detail explaining, it is influenced by the unbalance mass. In this study, we could find changes of the vibration caused by condition (increased mass, rotating speed, position) of unbalance mass and verify it using a software ? ADAMS <SUP>®</SUP> . With this study, it will help workers on the spot solve the problems concerning unbalance mass.
A dynamic model and numerical study on the liquid balancer used in an automatic washing machine
정충효,김창섭,최윤호 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.9
The rotational system of an automatic washing machine has two major technical difficulties. One is the collision of the tub against the frame at the beginning of its early spinning stage. A factor that causes such instability of the rotational object can be attributed to the deflection of the liquid inside the liquid balancer due to the unbalance mass. This study proposes the installation of a middle plate to avoid the deflection of the liquid and a CFD method is used to verify its effectiveness. The other is the whirling vibration occurred during the high speed rotation of the basket and it shakes the center of its rotational axis. This is because the balancer cannot generate enough restoration forces during its high speed rotation. It is necessary to employ the multi-race in the balancer in order to increase restoration forces. The analysis for the configuration has been performed using a dynamic model.
Rebalancing Method for a Front-loading Washing Machine Using a Robot Balancer System
Min Gyu Jo,Jae Hyun Kim,Jae Weon Choi 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.4
This paper presents a novel method for both the reduction of unbalance and rebalancing of a front-loading drum-type washing machine using a robot balancer. It precisely detects the amount of unbalanced mass (UB) and phase in the forward and backward directions due to laundry and water dropping that occur during washing. The robot balancer moves the forward and backward layers in the opposite directions of the detected unbalance. The results show that all the vibration modes of the washing machine were reduced significantly, and the time to reach the steady-state vibration of the tub was effectively reduced.
서스펜션 민감도 해석을 이용한 SRS 성능 개선 방안 연구
장영진(Youngjin Jang),김국태(Guktae Kim),신상하(Sangha Shin),장진희(Jinhee Jang),김인동(Indong Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper describes the sensitivity study and case study for improving the Smooth Road Shake (SRS) performance. Smooth Road Shake performance is one of the top quality concerns that directly affect vehicle sales. It is an important factor to ensure vehicle ride performance. So, the SRS design targets need to be defined and the proposed design needs to be assessed very early in the vehicle development phase. The SRS is composed of the steering wheel and floor panel vibrations caused by tire imbalance mass. This study focuses on the steering wheel torsional vibration resulting from the fore/aft walking mode of the corner caused by imbalance mass. We performed the fundamental dynamic simulation of SRS by using ADAMS solver based on Motionview with in-house templates. We showed the dominant factor for enhancing the SRS performance and we provided design recommendation.
Estimation of a Mass Unbalance Under the Crack on the Rotating Shaft
Park, Rai-Wung Institute of Control 2000 Transaction on control, automation and systems eng Vol.2 No.4
The aim of the work is to present a new method of estimating the existence of a mass unbalance and mass unbalance under a crack on a rotating shaft. This is an advanced new method for the detection of a mass unbalance and a new way to estimate the position of it under crack influence. As the first step, the shaft is physically modelled with a finite element method and the dynamic mathematical model is derived by using the Hamilton principle; thus, the system is represented by various subsystems. The equation of motion of the shaft with a mass unbalance and a crack are established by adapting the local mass unbalance and the stiffness change. this is a reference system for the given system. Based on a model for transient behavior induced from vabrations measured at the bearings, an elementary Estimator is designed to detect mass unblance on the shaft. Using the Estimator, a bank of the Estimator is established to estimate the estimate the position of the mass unbalance and arranged at a certain location on the shaft. The informations for the given system are the measurements of bearing displacements and velocity.
EFFECT OF SHAFT MISALIGNMENT ON HYPOID GEAR PAIR DRIVEN THROUGH A UNIVERSAL JOINT
Zhenghong Shi,Teik Chin Lim 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.2
An enhanced hypoid geared rotor system model incorporating a universal joint that connects driveline propeller shaft and pinion shaft is introduced in this study. The effect of shaft misalignment and pinion mass unbalance on hypoid gear dynamic response is evaluated under different assembly conditions. A nonlinear 14-DOF lumped parameter model based on coupled multi-body dynamics is applied by considering large rotational displacement in torsional direction. Results demonstrate three main influences from shaft misalignment and mass unbalance including speed and torque fluctuation as well as external bending moment on pinion shaft. It is also observed that bending moment generated can exert additional load on pinion shaft bearings which is found to be more sensitive to misalignment angle compared to dynamic response along lineof- action. Besides, shaft misalignment and mass unbalance excitation will interact with gear internal excitation from transmission error (TE) which can affect mesh parameters.