Experimental and Analytical Investigation on a Liquid Balance Ring for Automatic Washing Machines

Urbiola-Soto, Leonardo; López-Parra, Marcelo

doi:10.1115/esda2010-24902

Cited by 1 publication

(6 citation statements)

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“…21 that the fourth mode is comparable to the fluid waves induced by the baffle-fluid interaction in the circumferential direction [33]. Furthermore, a comparison with the lateral modes of vibration of a string for the n-modes [36] leads to ascertain that the eighth lateral mode of vibration makes a parallel with the axial wave induced by the baffle-fluid interaction [33]. Coupling the fourth circumferential mode of vibration of a ring with the eighth lateral mode of vibration of a string, a complex 3D wave shown schematically on Fig.…”

Section: Experiments With Baseline Design (Eight Baffles)mentioning

confidence: 87%

“…Establishing an analogy with the circumferential modes of vibration of a ring with m-modes [36], it can be seen from Fig. 21 that the fourth mode is comparable to the fluid waves induced by the baffle-fluid interaction in the circumferential direction [33]. Furthermore, a comparison with the lateral modes of vibration of a string for the n-modes [36] leads to ascertain that the eighth lateral mode of vibration makes a parallel with the axial wave induced by the baffle-fluid interaction [33].…”

Section: Experiments With Baseline Design (Eight Baffles)mentioning

confidence: 99%

“…The experimental work showed that the fluid is not stationary relative to the rigid body [33]. The motion in the rotating body is transmitted to the contacting liquid by shear stress.…”

Section: Experiments With Baseline Design (Eight Baffles)mentioning

confidence: 99%

“…Experiments were performed in the test rig with an unbalanced rotor [33]. This was not unstable in the absence of fluid in the ring cavity, but it underwent large vibrations due to the synchronous unbalance response.…”

Section: Experiments Without Bafflesmentioning

confidence: 99%

“…Based on observation of the experimental results [33], five cases can be identified about the fluid distribution inside the balance ring cavity as illustrated on Fig.…”

Section: Five Cases Of Studymentioning

confidence: 99%

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Respuesta al desbalance y estabilidad de un rotor flexible equipado con un dispositivo de autobalance tipo Leblanc

Soto¹

2011

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Although the liquid balancer has nearly a century of having been introduced by the French inventor Maurice LeBlanc, little information is available on the dynamic performance of this kind of device. Four main topics are investigated in this dissertation;(1) the unbalance response, (2) the stability characteristics, (3) the baffles curvature to modify the fluid-solid interaction and improve the dynamic performance, and (4) a hybrid two-plane balancing system for reduction of rotor dynamic forces, moments and support stresses in a vertical-axis washing machine. Experimental results indicate that the baffle-liquid interaction renders fluid modes of vibration of circumferential and axial type. This complex swirl flow is comprised of two inertial waves; one of such waves is synchronous with the rigid body motion, while the other is a fluid backward traveling wave, thus enhancing the system damping capability. An analytical dynamic model of the unbalanced response is derived and correlated with fluid flow visualization experiments and vibration measurements. It is shown that a flexible rotor employing a vi LeBlanc balancer has remarkable increase in the threshold speed of instability for aerodynamic cross-coupling and rotor internal friction damping. Further experiments are performed on a balance ring for washing machines varying the amount of baffles and also with curved baffles or "blades" to modify the fluid-solid interaction. Dynamic equations of motion for a fluid particle are introduced and solved to arrive to and optimum curvature. This novel design enables the washing machine drum to run at higher speeds, and reducing the centrifugal cycle while increasing the centrifugal force applied to the objects being washed. Finally, besides the conventional liquid balance ring placed on top of the rotating basket, a ball-balance ring was fitted to the lower part of such basket, such that a two-plane balancing is achieved by the combination of both types of devices. The advantages of including a second lower balance ring are mainly, the minimum space required to house it into the basket bottom, cost-effectiveness, and good dynamic performance achieved by reducing the unbalance forces, moments, and support stresses present on the rotating system. vii DISCLAIMER This dissertation is written in the English language for convenience to the author, and in agreement with the advisory committee. The aforesaid because the products of this research, namely; technical papers and patents, have been originally written in English and submitted to ASME 1 Conferences, ASME Journal of Vibration and Acoustics, Journal of Shock and Vibration, and the United States Patent Office with due proof review. Although every effort has been made in writing well this thesis, the author is not a native English speaker, therefore he apologizes for any typographical errors, misspellings, incorrect phrasings, or just plain wrong use of the English language. The author also believes that in writing this thesis in English, it will also be worldwide more acc...

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Section: Experiments With Baseline Design (Eight Baffles)mentioning

confidence: 87%

Section: Experiments With Baseline Design (Eight Baffles)mentioning

confidence: 99%

“…The experimental work showed that the fluid is not stationary relative to the rigid body [33]. The motion in the rotating body is transmitted to the contacting liquid by shear stress.…”

Section: Experiments With Baseline Design (Eight Baffles)mentioning

confidence: 99%

Section: Experiments Without Bafflesmentioning

confidence: 99%

“…Based on observation of the experimental results [33], five cases can be identified about the fluid distribution inside the balance ring cavity as illustrated on Fig.…”

Section: Five Cases Of Studymentioning

confidence: 99%

See 3 more Smart Citations

Respuesta al desbalance y estabilidad de un rotor flexible equipado con un dispositivo de autobalance tipo Leblanc

Soto¹

2011

View full text Add to dashboard Cite

show abstract

Experimental and Analytical Investigation on a Liquid Balance Ring for Automatic Washing Machines

Cited by 1 publication

References 11 publications

Respuesta al desbalance y estabilidad de un rotor flexible equipado con un dispositivo de autobalance tipo Leblanc

Respuesta al desbalance y estabilidad de un rotor flexible equipado con un dispositivo de autobalance tipo Leblanc

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