Optimum Design of Dynamic Absorber for Pattern Formation Phenomena Generated in Contact Rotating Systems (1st Report, In Case of Single-Degree of Freedom System)

Sowa, Nobuyuki; Kondou, Takahiro

doi:10.1299/kikaic.71.1131

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…Therefore, the computational burden becomes very large and the calculation process becomes complex, especially for a system having many degrees of freedom. In order to make the analysis more efficient, a new method developed in a previous report (4) is applied to the two-DOF system.…”

Section: Equation Of Motion and Characteristic Equation As Shown Inmentioning

confidence: 99%

“…In a previous report (4) , the authors proposed a new stability analysis method that is based on the existence of boundaries between stable and unstable regions (called stable-unstable boundaries) and applied this method to the optimum design of a dynamic absorber for pattern formation phenomena of a one-DOF system. The computation time of this new method is higher than that of the simplified method.…”

Section: Introductionmentioning

confidence: 99%

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Method of Preventing Unstable Vibration Caused by Time Delays in Contact Rotating Systems

Sowa

Kondou

Mori

et al. 2006

JSME Int. J., Ser. C

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In the field of mechanical engineering, a large number of systems exhibit time delays caused by, for example, viscoelastic deformation, plastic deformation, cutting, grinding, and wear. These time delays often cause unstable vibrations during the operation of these systems. Such phenomena occur as the chattering of machine tools and as the pattern formation phenomena in contact rotating systems. In the present report, the authors investigate the property of a new stability analysis developed for unstable vibration in contact rotating systems and apply it to a system with a time delay of one half of a rotation period. As a typical example, a prevention method used to change the structural design is formulated for twoand three-DOF systems. The validity of the present method is confirmed by the results of numerical computations.

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Section: Equation Of Motion and Characteristic Equation As Shown Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Method of Preventing Unstable Vibration Caused by Time Delays in Contact Rotating Systems

Sowa

Kondou

Mori

et al. 2006

JSME Int. J., Ser. C

Self Cite

View full text Add to dashboard Cite

show abstract

“…Kondou et al proposed a simplified method for stability analysis using an energy factor (1), (2) . They also applied a dynamic absorber as a countermeasure for the prevention and delay of pattern formation and studied the optimum design of a dynamic absorber for pattern formation phenomena (3) . However, they have not yet reported experimental verification.…”

Section: Introductionmentioning

confidence: 99%

Polygonal Wear of Work Rolls in a Hot Leveler of Steel Making Machine (4th Report, Experimental Verification of a Countermeasure by Using Dynamic Absorbers)

Matsuzaki

Sueoka

Ryu

et al. 2008

JEE

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In this paper, a countermeasure of pattern formation phenomena by using dynamic absorbers is investigated experimentally. An experimental equipment of a single degreeof-freedom pattern formation system with a pair of contact rotating rolls and a dynamic absorber are made. The experimental results are compared with the analytical results using approximated characteristic roots. According to the results of the experiments without a dynamic absorber, it is confirmed that the relation among the natural frequency of the system, the polygonal number and the rotating speed agree with the analytical results qualitatively. According to the results of the experiments using a damped dynamic absorber, the delaying effect of pattern formation is confirmed. Also, a good quantitative agreement between the experimental and analytical results is confirmed. According to the results of the experiments using an undamped dynamic absorber, it is confirmed that damping of a dynamic absorber is necessary to delay pattern formation phenomena.

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Generation mechanism of polygonal wear of work rolls in a hot leveler and a countermeasure by dynamic absorbers

Matsuzaki

Sueoka

Ryu

2008

International Journal of Machine Tools and Manufacture

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Optimum Design of Dynamic Absorber for Pattern Formation Phenomena Generated in Contact Rotating Systems (1st Report, In Case of Single-Degree of Freedom System)

Cited by 6 publications

References 3 publications

Method of Preventing Unstable Vibration Caused by Time Delays in Contact Rotating Systems

Method of Preventing Unstable Vibration Caused by Time Delays in Contact Rotating Systems

Polygonal Wear of Work Rolls in a Hot Leveler of Steel Making Machine (4th Report, Experimental Verification of a Countermeasure by Using Dynamic Absorbers)

Generation mechanism of polygonal wear of work rolls in a hot leveler and a countermeasure by dynamic absorbers

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