• Title/Summary/Keyword: Bearing race

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Dynamic response of a HDD pivot ball bearing acted by Hertzian contact force (Hertzian contact force에 의한 HDD pivot ball bearing의 동적 반응 분석)

  • Yoon, Joo Young;Park, No-Cheol;Lim, Gunyeop;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.993-993
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    • 2014
  • Increasing the density magnetic recording of a hard disk drive needs to improve position control of a slider. We have troubles analyzing position of a slider by nonlinear property of pivot ball bearing. Many researches analyze a hard disk drive to change pivot ball bearing part from balls to springs. Pivot ball bearing operates by rotation and movement of balls. This study considers Hertzian contact force when balls contact with outer race to analyze nonlinear movement of a ball bearing. Experiment of this study measures movement of a circular center of a pivot ball bearing. We also verify the simulation results and the experiment results.

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Discussion on Hardness Measuring of Bearing Steel by X-ray Diffraction (X선회절에 의한 베어링강의 경도측정에 대한 고찰)

  • 이한영
    • Tribology and Lubricants
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    • v.18 no.3
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    • pp.187-193
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    • 2002
  • The half-value breadth off-ray diffraction profile line is generally used for a factor in nondestructive hardness measuring method of steel. In this paper, the problem in using the half-value breadth for the hardness measuring method is evaluated in strain hardened steel. And new hardness measuring method using residual stress is proposed X-ray diffraction test after rolling contact fatigue test of ball bearing with inner race of various hardness are carried out to measure the distribution of residual stress and half-value breadth from surface. The result of this study shows that there is little correlation between half-value breadth and hardness in the higher strength region and in the region increasing the hardness by strain hardening. But the magnitude of residual stress on/under race after rolling contact fatigue test becomes clearly to be correlative with hardness. Thus, it is concluded that the hardness of strain hardened steel can be estimated by this relationship between residual stress and hardness.

Defects Diagnosis of Ball Bearings by Neural Network (신경회로망을 이용한 볼 베어링의 결함진단)

  • 양보석;최성필;최원호;김진욱
    • Journal of Advanced Marine Engineering and Technology
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    • v.18 no.5
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    • pp.36-45
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    • 1994
  • This paper describes how to identify standard numbers and to diagnose defects of the ball bearings. The first stage of the networks is a procedures for identifying standard numbers of the bearings, and the next stage carries out the diagnosis of defects on the outer race and the inner race of bearings. The identification and the diagnosis of bearings were carried out by simulations and experiments.

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Analysis of the Rolling Contact Fatigue of the Shot Peened Ball Bearing by X-ray Diffraction (X선회절에 의한 SHOT PEENING처리 구름베어링의 구름접촉 피로해석)

  • 이한영
    • Tribology and Lubricants
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    • v.13 no.2
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    • pp.39-45
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    • 1997
  • The shot peening treatment were conducted for improving the strength of rolling contact fatigue of machine element like a gear. This paper was undertaken to analyze the influence of shot peening treatment for inner race of ball bearing on the rolling contact fatigue. Shot peening treatment were applied to the full hardened and the carbonitrided bearing. And the rolling contact fatigue life test and X-ray diffraction test were carried out. The results of this study showed that the fatigue life of ball bearing in the clean and the contaminated oil could be improved by shot peening treatment. This effect was found to be more pronounced to the full hardened bearing. These facts might be due to the generation of compressive residual stress and the strain hardening of surface layer by shot peening treatment. The failure of the shot peened bearing were presumed to initiate at surface.

A Study on Orbital Forming Analysis of Automotive Hub Bearing using the Explicit Finite Element Method (외연적 유한요소법을 이용한 자동차 Hub Bearing의 Orbital Forming해석에 관한 연구)

  • Cho, Hyun-Jik;Koo, Jeong-Seo;Bae, Won-Rak;Lim, Jong-Soon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.1
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    • pp.29-36
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    • 2008
  • In this paper, the orbital forming analysis of an automotive hub bearing was studied to predict forming performances using the explicit finite element method. To find an efficient solution technique for the orbital forming, axisymmetric finite element models and 3D solid element models were solved and numerically compared. The time scaling and mass scaling techniques were introduced to reduce the excessive computational time caused by small element size in case of the explicit finite element method. It was found from the numerical simulations on the orbital forming that the axisymmetric element models showed the similar results to the 3D solid element models in forming loads whereas the deformations at the inner race of bearing were quite different. Finally the strains at the inner race of bearing and the forming forces to the peen were measured for the same product of the numerical model by test, and were compared with the 3D solid element results. It was founded that the test results were in good agreements with the numerical ones.

Support Vector Machine Based Bearing Fault Diagnosis for Induction Motors Using Vibration Signals

  • Hwang, Don-Ha;Youn, Young-Woo;Sun, Jong-Ho;Choi, Kyeong-Ho;Lee, Jong-Ho;Kim, Yong-Hwa
    • Journal of Electrical Engineering and Technology
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    • v.10 no.4
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    • pp.1558-1565
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    • 2015
  • In this paper, we propose a new method for detecting bearing faults using vibration signals. The proposed method is based on support vector machines (SVMs), which treat the harmonics of fault-related frequencies from vibration signals as fault indices. Using SVMs, the cross-validations are used for a training process, and a two-stage classification process is used for detecting bearing faults and their status. The proposed approach is applied to outer-race bearing fault detection in three-phase squirrel-cage induction motors. The experimental results show that the proposed method can effectively identify the bearing faults and their status, hence improving the accuracy of fault diagnosis.

A Study on the Vibration Analysis of Multi-components Damaged Ball Bearing under Radial Load (반경하중을 받는 결함 볼베어링의 진동해석에 관한 연구)

  • 김영주;전효중
    • Journal of Advanced Marine Engineering and Technology
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    • v.12 no.3
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    • pp.29-42
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    • 1988
  • With the Hertzian contact theory, it is possible to determine the bearing load distributing pattern among the balls and rollers and also variations of the load-displacement relationships for rolling elements contacting raceways according to bearing clearance, load distribution, contact forces and dimensions of bearing components (i.e diameter of raceway and rolling elements), etc. In this paper the calculation theories of contact load and normal approach between two raceways under radial load are reviewed, and compared these calculation results with those of experimental results. A new calculation theory for elastic displacement of outer-race of ball bearing under radial load is developed by authors by application of energy method, which is independent on the effects of roughness, bending or eccentricity of bearing with driving shaft, and is effective in measuring the location of its defect.

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NRRO Analysis of 3.5" HDD Spindle Ball Bearings Utilizing the Measured Geometric Imperfection (실측형상오차를 이용한 3.5인치 HDD 스핀들 볼베어링의 NRRO 해석)

  • 이영근;최상규;윤기찬;이영신
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.05a
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    • pp.585-591
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    • 2003
  • It has been widely known that geometrical or form errors of ball bearings such as ball size error, ball waviness, inner and outer race waviness due to inherent manufacturing imperfection are one of the major sources of uncontrollable non-repeatable run-out (NRRO) vibration in HDD spindle motor. NRRO in HDD is also known to be the primary cause of limiting the storage capacity of HDD. In this paper, We performed vibration analysis for NRRO a ball bearing being used in 3.5" HDD spindle motor. To theoretically estimate NRRO considering the geometrical errors of ball bearing components, a simple three degrees of freedom model was proposed and then vibration analysis for axial and radial NRRO was conducted utilizing the measured geometric imperfection of a bearing with both the waviness magnitude and phase taken into account. Effects of bearing preload and clearance on NRRO was also investigated as an effort to predict their optimum values minimizing bearing NRRO.

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Analytical Theory of Ball Bearing Considering Waviness of Rolling Elements (구름요소의 Waviness 를 고려한 볼베어링 해석 이론)

  • 정성원;장건희
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.11 no.7
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    • pp.275-286
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    • 2001
  • The research presents an analytical theory to calculate the characteristics of the bal bearing with waviness in its rolling elements considering the centrifugal force and gyroscopic moment of bal. The effects of centrifugal force and gyroscopic moment are introduced to the kinematic constraints and force equilibrium equations. and the waviness of rolling elements is modeled by sinusoidal function to calculate the contact force at each ball. The numerical solutions of governing equation of berating due to waviness are calculated by using the Newton-Raphson method. The accuracy of the research is validated by comparing the contact force. contact angle in case of considering the centrifugal force and gyroscopic moment of bal and the contact force and vibration frequencies in cases of considering waviness with the prior researches respectively. It investigates the stiffness, contact force. displacement and vibration frequencies of the ball bearing considering not only the centrifugal force and gyroscopic moment of ball but also the waviness of the rolling elements.

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Analysis of rolling contact fatigue of shotpeened ball bearing by X-ray diffraction (X선회절에 의한 SHOTPEENING처리 구름베어링의 구름접촉피로해석)

  • 이한영;이동엽
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1996.10a
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    • pp.207-212
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    • 1996
  • The shotpeening treatment were conducted for improving the strength of rolling contact fatigue of machine element like a gear. This paper was undertaken to analyze the influence of shotpeening treatment for inner race of ball bearing on the roiling contact fatigue. Shotpeening treatment were applied to the full hardened and the carbonitrided bearing. And the rolling contact fatigue life test and X-ray diffraction test were carried out. The results of this study showed that the fatigue life of ball bearing in the clean and the contaminated oil could be improved by shotpeening treatment. This effect was found to be more pronounced to the full hardened bearing.

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