Dynamic Analysis of an Automatic Washing Machine With a Hydraulic Balancer

Bae, Sangwoo; Lee, J.M.; Kang, YS; Kang, Jae-Gu; Yun, Jiang

doi:10.1006/jsvi.2001.4162

Cited by 72 publications

(49 citation statements)

References 2 publications

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“…Thus the following discussion will be confined to it. The angle θ is the angular displacement of 1 Oz from OZ , and also the displacement of the rotor axis.…”

Section: Description Of the Rotor Attitudementioning

confidence: 99%

“…The one-side bearing structure is hard to control the vibrations and noises caused by the mass eccentricity, and may also aggravate the abrasion of devices. A traditional method to solve this problem is to use a hydraulic balancer [1][2][3]to reduce the vibration. However, although has advantages such as simple and easy to be applied, the method is a passive way to restrain the vibration.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A position control method for vertical rotor orientation system

Liu¹,

Yang²,

Di³

et al. 2016

Proceedings of the 2016 International Conference on Advanced Electronic Science and Technology (AEST 2016)

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Abstract. Vertical rotating devices may cause large amplitude vibration or even lose stability during low-speed operation. This paper discusses the control approaches of a low-speed vertical rotor orientation system based on the electromagnetic levitation. In the paper, according to the gyro mechanics principle, the nonlinear dynamic equations of the vertical rotor system are established and the kinetic characteristics of the system in the gravitational field are analyzed. Considering the uncertainties of the system, a position control strategy used for the vertical rotor orientation system is presented based on the gyroscope effect. Finally, the simulation of the control system and experiment system are carried out and set up to verify the feasibility and effectiveness of the control method. Results show that the presented control approach is able to achieve a stable positioning control for the spinning rotor.

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“…Thus the following discussion will be confined to it. The angle θ is the angular displacement of 1 Oz from OZ , and also the displacement of the rotor axis.…”

Section: Description Of the Rotor Attitudementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A position control method for vertical rotor orientation system

Liu¹,

Yang²,

Di³

et al. 2016

Proceedings of the 2016 International Conference on Advanced Electronic Science and Technology (AEST 2016)

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show abstract

“…With passive solutions it is meant technology which does not need external control stimuli, instead the positioning is done using the circulatory forces coming from rotation of a counterweight. Passive counterbalancing can be done with liquid like in the Leblanc balancer in [14] and [2] or derivations [15]. It can also be done with solid masses.…”

Section: Counterbalancingmentioning

confidence: 99%

“…Passive counterbalancing can be done with a liquid filled ring called the Leblanc balancer. In [14] a mathematical model of such a hydraulic balancer in steady state condition was derived and implemented in a model of a vertical axis washing machine dynamic analysis of an automatic washing machine during spin drying mode. A mathematical model of the hydraulic balancer at steady state is validated by the experimental result of the centrifugal force.…”

Section: Introductionmentioning

confidence: 99%

Multibody modeling and vibration dynamics analysis of washing machines

Nygårds

Berbyuk

2011

Multibody Syst Dyn

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In this paper a computational model of a horizontal axis washing machine is presented. The model has been built using a theoretical-experimental methodology consisting of integration of multibody system (MBS) formalism, detailed modeling of machine functional components and experimental data based validation. The complete model of a washing machine is implemented in the commercial MBS environment Adams/View from MSC.Software.An undesirable impact of washing machine operation on the surroundings is vibration and noise. The impact comes from system dynamics and poorly distributed load inside the drum, creating an imbalance. To get insight into vibration dynamics extensive simulations have been performed for washing machines in service as well as for machines in the developing stage by using the created computational model. This paper presents several results of numerical studies of the vibration dynamics of washing machines including the study of sensitivity of system dynamics with respect to suspension structural parameters, and the results of investigation of the potential of the automatic counterbalancing technology for vibration output reduction. In particular, simulations of the considered two plane balancing device has shown an existing significant potential in eliminating unbalanced load at supercritical spinning speed, resulting in a substantial vibration reduction in washing machines.Commemorative Contribution.

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“…The one-side bearing structure will lead to vibration during operation and, consequently, cause collision, noise and failure. One of the traditional methods to solve this problem in washing machines is through the addition of a passive balancer [1][2][3]. However, passive control approaches, although having the advantages of simplicity and low cost, are unsatisfactory in vibration reduction because of their open-loop property.…”

Section: Introductionmentioning

confidence: 99%

L1 Adaptive Control for a Vertical Rotor Orientation System

Liu

Yang

et al. 2016

Applied Sciences

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Bottom-fixed vertical rotating devices are widely used in industrial and civilian fields. The free upside of the rotor will cause vibration and lead to noise and damage during operation. Meanwhile, parameter uncertainties, nonlinearities and external disturbances will further deteriorate the performance of the rotor. Therefore, in this paper, we present a rotor orientation control system based on an active magnetic bearing with L 1 adaptive control to restrain the influence of the nonlinearity and uncertainty and reduce the vibration amplitude of the vertical rotor. The boundedness and stability of the adaptive system are analyzed via a theoretical derivation. The impact of the adaptive gain is discussed through simulation. An experimental rig based on dSPACE is designed to test the validity of the rotor orientation system. The experimental results show that the relative vibration amplitude of the rotor using the L 1 adaptive controller will be reduced to ∼50% of that in the initial state, which is a 10% greater reduction than can be achieved with the nonadaptive controller. The control approach in this paper is of some significance to solve the orientation control problem in a low-speed vertical rotor with uncertainties and nonlinearities.

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Dynamic Analysis of an Automatic Washing Machine With a Hydraulic Balancer

Cited by 72 publications

References 2 publications

A position control method for vertical rotor orientation system

A position control method for vertical rotor orientation system

Multibody modeling and vibration dynamics analysis of washing machines

L1 Adaptive Control for a Vertical Rotor Orientation System

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