Limits for the Use of Auto‐Balancing

Olsson, Karl-Olof

doi:10.1155/s1023621x04000235

Cited by 12 publications

(7 citation statements)

References 8 publications

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“…It is not possible to find a closed form solution to (28), however, if we consider the case with no damping C = 0 then the equations simplify due to the decoupling between the x and y directions. As a consequence, we find that part of the physically realisable solution is given by…”

Section: Determination Of the Coefficients A 1 And A 2 In Terms Of Thmentioning

confidence: 99%

Two-plane automatic balancing: A symmetry breaking analysis

Rodrigues

Champneys

Friswell

et al. 2011

International Journal of Non-Linear Mechanics

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We present an analysis of a two-plane automatic balancing device for rotating machinery. The mechanism consists of a pair of races that contain balancing balls which move to eliminate imbalance due to rotor eccentricity or principal axis misalignment. A model is developed that includes the effect of support anisotropy and rotor acceleration. The symmetry of the imbalance is considered, and techniques from equivariant bifurcation theory are used to derive a necessary condition for the stability of balanced operation. The unfolding of the solution structure is explored and we investigate mechanical systems in which either the supports or the automatic ball balancer is asymmetric. Here it is shown that, provided the imbalance is small, the balanced state is robust to the considered asymmetries.

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Section: Determination Of the Coefficients A 1 And A 2 In Terms Of Thmentioning

confidence: 99%

Two-plane automatic balancing: A symmetry breaking analysis

Rodrigues

Champneys

Friswell

et al. 2011

International Journal of Non-Linear Mechanics

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“…Many studies ( [1] to [6]) deal with the automatic balancing by mobile masses (in general balls). The most important remark concerns the rotational speed of the drum ω, which has to be higher than the last suspension natural frequency ω n in order to have the correcting masses out of phase with the unbalance ([1], see Fig.…”

Section: Theorymentioning

confidence: 99%

An auto-balancer device for high spin-drying frequencies (LoWash Project)

Clerc¹,

Carbonelli²,

Augez³

2015

MATEC Web of Conferences

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Abstract. Auto-balancing or active control balancing can be efficient solutions for high speed rotors with changing out-ofbalance loads like washing machines in spin-drying mode. In the LoWash EU project, Vibratec is in charge to design, to build and to validate a balancing system for reducing the vibrations at high spin-drying speeds. The system is based on two trolleys rolling in a ring linked to the drum. The trolley shape allows a ring cross section optimization and they are equipped with a mechanism for escaping the disadvantage encountered at low speeds by similar devices. Analytical and multi-body models are first made for understanding the mechanisms, highlighting the driving parameters and drawing the final design of a first prototype which is inserted in a washing machine drum. Different tests are carried out for different initial unbalances and different rotation speeds: the residual unbalance is measured by means of a set of accelerometers mounted on the tub, while the mobile masses behaviour is observed by means of a large aperture swift camera. The test results highlight the auto-balancer high efficiency but also the sensitivity to geometrical defects which should be corrected in the next systems. According the theory, the balancing is efficient when the rotation frequency is significantly greater than the hanging frequencies. The multi-body model relevance is also demonstrated. A washer-dryer prototype including an auto-balancer second prototype and two other innovations, regarding thermal exchange efficiency and drum insulation, will be tested in operating conditions.

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“…Regarding energy dissipation the Iwan-based model also performs best but is here followed by the smoothing function based models (6) and (7). The parameters of the respective models found when minimizing the cost function (18), for one of the tested dampers, was for the Coulomb dry friction damper model (4) Similarly the parameters of the foot model were estimated from measurement data using the Optimization toolbox of Matlab to minimize the model error compared to dynamic measurements according to (19). In Fig.…”

Section: Functional Components Parameter Identificationmentioning

confidence: 99%

“…At the same time the balance ring around which the masses travel, marked by a dotted circle will give a reaction force perpendicular to the trajectory, see Details on how to write analytical the equations for the dynamics of rigid rotors having two passive balancing devices are for example available in [17] and [18]. In the latter effects of different geometrical defects such as eccentricity and ellipticity on the performance of the balancing mechanism Fig.…”

Section: Counterbalancingmentioning

confidence: 99%

See 1 more Smart Citation

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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Limits for the Use of Auto‐Balancing

Cited by 12 publications

References 8 publications

Two-plane automatic balancing: A symmetry breaking analysis

Two-plane automatic balancing: A symmetry breaking analysis

An auto-balancer device for high spin-drying frequencies (LoWash Project)

Multibody modeling and vibration dynamics analysis of washing machines

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