• Title/Summary/Keyword: Mass Balancing

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Optimum Field Balancing of Ratating Machinery Using Genetic Algorithm (유전 알고리즘을 이용한 회전기계의 최적 현장평형잡이)

  • Choi, Won-Ho;Yang, Bo-Suk;Joo, Ho-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.6
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    • pp.1819-1826
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    • 1996
  • This paper present the claculating method of optimum correction mass within permissible vibration linits for ratating machinery in two-plane field balancing. Basic technique of this method is based on influence coefficient method, and grphic vector composition that the resultant of two influence vectors obtained by trial mass have to be equilibrium with initial vibration vector in the each correction plane. Genetic algorithm which is a search algorithm based on the mechanism of natural selection and natural genetics is sued for vector composition, and SUMT method is used to objective function which seeks optimum correction mass for balancing a rotor.

Optimum Balancing of Rotating Machinery Using Genetic Algorithm (유전 알고리즘을 이용한 회전기계의 최적 평형잡이)

  • 주호진;최원호;양보석
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 1995.10b
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    • pp.195-202
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    • 1995
  • This paper presents the calculating method of optimum correction mass within permissible vibration limits for rotating machinery in two-plane field balancing. Basic technique of this method based on influence coefficient method, is graphic vector composition that the resultant of two influence vectors obtained by trial mass have to be equilibrium with initial vibration vector in the each correction plane. Genetic algorithm which is a search algorithm based on the mechanics of natural selection and natural genetics is used for vector composition, and SUMT method is used to objective function which seeks optimum correction mass for balancing a rotor.

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A Study on Balancing of High Speed Spindle using Influence Coefficient Method (영향계수법을 이용한 고속 스핀들의 밸런싱에 관한 연구)

  • Koo, Ja-Ham;Kim, In-Hwan;Hur, Nam-Soo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.4
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    • pp.104-110
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    • 2012
  • The spindle with a built-in motor can be used to simplify the structure of machine tool system, while the rotor has unbalance mass inevitably. A high-speed spindle can be very sensitive to rotating mass unbalance which has harmful effect on many machine tools. Therefore, the balancing procedure to reduce vibration in rotating system is certainly needed for all high-speed spindles. So, it was performed with a spindle-bearing system for CNC automatic lathe by using numerical procedure. The spindle is supported by the angular contact ball bearings and the motor rotor is fixed at the middle of spindle. The spindle-bearing system has been investigated using combined methodologies of finite elements and transfer matrices. The balancing was performed through influence coefficient method and the comparison was made by whirl responses between before balancing and after balancing. As a result, balancing of simple spindle model reduced whirl orbit magnitude in case of a completely assembled spindle model.

An Optimal Correction Balancing of A High-Speed Flexible Rotor (최적화기법을 이용한 고속 탄성회전체의 밸런싱)

  • 이용복;이동수;최동훈
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.6
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    • pp.1402-1410
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    • 1995
  • An influence coefficient method with an optimal correction balancing algorithm is developed for balancing a high-speed flexible rotor system. Conventional flexible balancing algorithms such as least square and weighted least square algorithms may not satisfy allowable residual vibration levels in certain speed ranges, while the optimal correction balancing method can be more effective in controlling vibration levels in a target speed. Related analyses were reviewed and applied to a test rig to show the effectiveness of the optimal correction balancing method.

Analysis of Dynamic Behavior and Balancing of High Speed Spindle (고속 스핀들의 동적거동과 밸런싱 해석)

  • Koo, Ja-Ham;Kwon, Soon-Goo;Kim, Jong-Soon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.1
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    • pp.238-244
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    • 2017
  • A spindle with a built-in motor can be used to simplify the structure of a machine tool system, but the rotor inevitably has unbalanced mass. This paper presents an analysis of the dynamic behavior. The spindle was used in a CNC lathe and investigated using the finite element method and transfer matrices. The high-speed spindle can be very sensitive to the rotation of an unbalanced mass, which has a harmful effect on many machine tools. Thus, a balancing procedure was performed with a spindle-bearing system for the CNC lathe by numerical analysis. The balancing was performed through the influence coefficient method, and the whirl orbit radii before and after balancing were compared to evaluate the effects. The results show that the rotational speed of the spindle seriously affects the whirl responses of the spindle. The whirl responses were also affected by other factors, such as the unbalanced mass and bearing stiffness. The balancing of the assembled spindle model significantly reduced the whirl orbit magnitude.

A Study on Balancing of High-speed Spindle of CNC Automatic Lathe (CNC 자동선반 고속 스핀들의 밸런싱에 관한 연구)

  • Kim, Tae-Jong;Koo, Ja-Ham;Lee, Shi-Bok;Kim, Moon-Saeng
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.11
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    • pp.1214-1221
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    • 2009
  • A high-speed spindle can be very sensitive to rotating mass unbalance which has harmful effect on many machine tools. Therefore, the balancing procedure to reduce vibration in rotating system is certainly needed for all high-speed spindles. So, balancing procedure was performed with a spindle-bearing system for CNC automatic lathe by using numerical procedure. The spindle is supported by the angular contact ball bearings and the motor rotor is fixed at the middle of spindle. The spindle-bearing system has been investigated using combined methodologies of finite elements and transfer matrices. The balancing was performed through influence coefficient method and the comparison was made by whirl responses between before balancing and after balancing. As a result, balancing of simple spindle model reduced whirl orbit magnitude in case of a completely assembled spindle model.

A Study on the Design and Measurement of a Balancing Device for Unbalance Correction of Differential Gear Case in Automobile (자동차 Differential gear case 불평형 교정을 위한 balancing 장치설계 및 측정에 관한 연구)

  • Jang, T.H.;Gwon, J.U.;Eum, J.H.;Kim, J.A.;Kim, T.G.
    • Journal of the Korean Society for Heat Treatment
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    • v.33 no.6
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    • pp.303-309
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    • 2020
  • A vehicle's differential gear is a device designed to allow the vehicle's outer wheels to turn faster than the inner wheels when turning on a curve. The differential gear case is the main component of the differential gear system, which is composed of ring gear, pinion gear and side gear, and is fastened by pinion shaft pins. The differential gear case rotates when the vehicle is running, so balancing calibration is very important. In this study, a balancing machine that can diagnose and correct the differential gear case and mass imbalance of various rotating bodies was designed. The differential gear case was rotated at high speed to accurately diagnose the location and value of the unbalanced mass, and it was designed to be balanced and corrected by removing the unbalanced mass by drilling. After calibration, it was confirmed that the unbalanced value of all the measured samples was reduced to less than 180g.mm, and the unbalance reduction ratio was improved to 60~70%.

Kinematic Analysis and Dynamic Balancing Technique in a Link-Motion Mechanism (링크모션 메커니즘의 기구학적 분석 및 다이나믹 발란싱 테크닉)

  • Suh, Jin-Sung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.498-502
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    • 2004
  • In a link-motion mechanism, numerous links are interconnected and each link executes a constrained motion at a high speed. Due to the complicated constrained motions of the constituent links, dynamic unbalance forces and moments are generated and transmitted to the main frame. Therefore unwanted vibration is produced. This degrades productivity and precise work. Based on constrained multi-body dynamics, the kinematic analysis is carried out to enable design changes to be made. This will provide the fundamental information for significantly reducing dynamic unbalance forces and moments which are transmitted to the main frame. In this work, a link-motion punch press is selected as an example of a link-motion mechanism. To calculate the mass and inertia properties of every link comprising a link-motion punch press, 3-dimensional CAD software is utilized. The main issue in this work is to eliminate the first-order unbalance force and moment in a link-motion punch press. The mass, moment of inertia link length, location of the mass center in each link have a great impact on the degree of dynamic balancing which can be achieved maximally. Achieving good dynamic balancing in a link motion punch press is quite essential fur reliable operation at high speed.

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The Experimental Study and Comparison on Usage of Vibration Monitoring Sensors for Positioning of Balancing on Rotating Machinery (진동 감시용 위치 결정 센서의 위상오차에 대한 실험적 고찰과 비교평가)

  • Oh, Seung-Tae;Yoo, Mu-Sang;Bong, Suk-Keun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.314-320
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    • 2014
  • Field balancing is required in any kind of phase information for the determination location balancing mass toward a rotor unbalance mass. Phase or phase angle is a measurement of the relationship of how one vibration signal which relates to another vibration signal and is commonly used to calculate the placement of balance weight. In this paper, A right guideline shows the photo optical speed sensor as the external keyphasor is a very useful when diagnosing machinery vibration problems on considering a phase lag comparing to the laser optical speed sensor. Some experimental results generate the interesting phase errors when appling to a wrong conditions. So, Usage of photo optical speed sensor which is used primarily to measure the shaft rotating speed serves as a reference for measuring vibration phase information has effect on the placement of phase angle how it was misunderstood. This paper will help a right method to search for the position of balancing weight and serves as baseline for further measurements using low cost and much easier user convenience. It is concluded that the propose baseline is likely to be applicable to apply to the practical field balancing weight.

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The Experimental Study and Comparison on Usage of Vibration Monitoring Sensors for Positioning of Balancing on Rotating Machinery (진동 감시용 위치 결정 센서의 위상오차에 대한 실험적 고찰과 비교 평가)

  • Oh, Seung-Tae;Yoo, Mu-Sang;Bong, Suk-Keun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.25 no.2
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    • pp.101-107
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    • 2015
  • Field balancing is required in any kind of phase information for the determination location balancing mass toward a rotor unbalance mass. Phase or phase angle is a measurement of the relationship of how one vibration signal which relates to another vibration signal and is commonly used to calculate the placement of balance weight. In this paper, A right guideline shows the photo optical speed sensor as the external KeyPhasor is a very useful when diagnosing machinery vibration problems on considering a phase lag comparing to the laser optical speed sensor. Some experimental results generate the interesting phase errors when appling to a wrong conditions. So, Usage of photo optical speed sensor which is used primarily to measure the shaft rotating speed serves as a reference for measuring vibration phase information has effect on the placement of phase angle how it was misunderstood. This paper will help a right method to search for the position of balancing weight and serves as baseline for further measurements using low cost and much easier user convenience. It is concluded that the propose baseline is likely to be applicable to apply to the practical field balancing weight.