[논문]차량용 볼조인트의 최악 조건을 고려한 강건 설계

신봉수; 김성욱; 김종규; 이권희

doi:10.14775/ksmpe.2016.16.1.102

차량용 볼조인트의 최악 조건을 고려한 강건 설계
Robust Design of an Automobile Ball Joint Considering the Worst-Case Analysis 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.16 no.1, 2017년, pp.102 - 111

신봉수 ((주)SL) , 김성욱 (동아대학교 기계공학과) , 김종규 ((주) 센트랄) , 이권희 ((주) 센트랄)

Abstract ▼ AI-Helper

An automobile ball joint is the element for connecting the control arm and the knuckle arm, allowing rotational motion. The ball joint consists of the stud, plug, socket, and seat. These components are assembled through the caulking process that consists of plugging and spinning. In the existing research, the pull-out strength and gap stiffness were calculated, but we did not consider the uncertainties due to the numerical analysis and production. In this study, the uncertainties of material property and tolerance are considered to predict the distributions of pull-out strength and gap stiffness. Also, pull-out strength and gap stiffness are predicted as the a distribution rather than one deterministic value. Furthermore, a robust design applying the Taguchi method is suggested.

주제어

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문제 정의

(5) This study focuses on the numerical anlysis. For the future study of this research, it is required to compare the numerical results with the experimental results.
ball joint was predicted as the deterministic value. In this research, these uncertainties are considered to determine the robust design. The robust design of the ball joint considering the structural responses is suggested by applying the parameter design suggested by Dr.

제안 방법

Thus, it is more realistic to suggest its distribution rather than the deterministic value in predicting the pull-out strength and the gap stiffness. In this research, the noise factors are selected as the material properties of the seat and the tolerances of design variables. The material of the seat, one of the components of ball joint, is nylon.
Jang and Sin1,2 calculated the pull-out strength and the gap stiffness using the commercial software called the DAFUL3,4. One of the research objectives was to inspect the caulking quality using three-dimensional dynamic analysis. In addition, in Ref.
If the pull-out strength is obtained from the three-dimensional analysis, it will be impossible to implement the robust design due to excessive computing time. Thus, in this research, the two-dimensional analysis is adopted to perform the pull-out strength analysis of the ball joint.
Because the SN ratio is derived from the expectation of the loss function, the effect of the average and the standard deviation is related and coupled in many design problems ^10-12. Thus, this research adopts the worst-case analysis considering the average and standard deviation of response.

대상 데이터

The ball joint used in this study is the product being installed in the midsize car of A company. This ball joint consists of stud, plug, socket and seat, and the three-dimensional analysis using the flexible multibody dynamics was already conducted in the existing research 2.
[2]. The base design of the ball joint was completed by using the CATIA. Based on this, the three-dimensional dynamic analysis was performed, and the finite element model of each component was shown as in Fig.
In this research, the noise factors are selected as the material properties of the seat and the tolerances of design variables. The material of the seat, one of the components of ball joint, is nylon. The material property of nylon fluctuates relatively heavily when the material test is conducted repeatedly.

이론/모형

It can be seen that the distributions of the pull-out strength and the gap stiffness due to the noise factors should not be neglected. The distributions of the structural responses could be predicted by applying the DOE and the Taguchi method.

참고문헌 (14)

Sin, B.S. "Optimum Design of a Ball Joint for Vehicle," A Thesis for a Master, Dong-A University, Republic of Korea, 2014.
Sin, B.S. and Lee, K.H., "Process Design of a Ball Joint, Considering Caulking and Pull-Out Strength," The Scientific World Journal, Vol. 2014, ID 971679, 2014.

상세보기
Virtual Motion, Inc., DAFUL 4.1 User's Manual, 2012.
Lee J.K., Lee, C.H., and Bae, D.S., "A Parametric Generalized Coordinate Formulation for Mechanical Joint Elements in Dynamic Systems," Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, Vol. 228, No. 6, pp. 1063-1076, 2013.
Dassault Systemses Simulia Corp., Abaqus On-Line Help, 2012.
Taguchi, G, "Systems of Experimental Design(Vol. I, II)", Kraus International Publications, New York, USA, 1987.
Phadke, M.S., Quality Engineering Using Robust Design, Prentice Hall, Englewood Cliffs, New Jersey, USA, 1989.
Teruo, M., Taguchi Methods
Park, G.J., Analytic Methods for Design Practice, Springer, London, UK, 2007.
Montgomery, D.C., Design and Analysis of Experiments, 3rdEditon, John Wiley&Sons, Singapore, 1991.
Nair, V. H., "Taguchi's Parameter Design: A Panel Discussion," Technometrics, Vol. 34, No. 2, pp. 127-161, 1992.

상세보기
Lee, K. H., "A Robust Structural Design Method Using the Kriging Model to Define the Probability of Design Success," Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, Vol. 224, No. 2, pp. 379-388, 2010.

상세보기
Kim, K. M., "Optimization of Sheet Metal Forming Process Using Mahalanobis Taguchi System," J. of KSMPE, Vol. 15, No. 1, pp.95-102, 2016
Kim, K. M. and Park, J. C,, "Minimization of Warpage of Injection Molded Parts using Dynamic Robust Design," J. of KSMPE, Vol.14, No. 1, pp.44-50, 2015

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차량용 볼조인트의 최악 조건을 고려한 강건 설계
Robust Design of an Automobile Ball Joint Considering the Worst-Case Analysis 원문보기

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차량용 볼조인트의 최악 조건을 고려한 강건 설계 Robust Design of an Automobile Ball Joint Considering the Worst-Case Analysis 원문보기

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차량용 볼조인트의 최악 조건을 고려한 강건 설계
Robust Design of an Automobile Ball Joint Considering the Worst-Case Analysis 원문보기

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