Abstract
Aiming at the problem that the multi-objective evaluation of performance and the weighting coefficients of indexes is difficult to find, a fuzzy comprehensive performance evaluation method of rolling linear guide (RLG) is proposed. Considering the static and dynamic indexes, a structure model containing nine weighting coefficients was constructed. The performance evaluation function was established by the compromise programming method and the average power method, while weighting coefficients were determined by the improved analytic hierarchy process (I-AHP); the mathematical model was obtained to evaluate the RLG in a certain application. The evaluation results show that the confidence of the static, dynamic and comprehensive performance of the RLG is 59.21 %, 81.97 %, and 63.34 %, respectively. The feasibility of the method was verified by numerical simulation. This method indicates the pros and cons of the performance of the RLG and also indicates the direction for its optimized design.
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Abbreviations
- C :
-
Basic rated dynamic load [N]
- Cij :
-
Important relationship between factors i and j
- CI :
-
Average random consistency index
- CR :
-
Consistency comparison coefficient
- D w :
-
Diameter of roller [mm]
- E1, E2 :
-
Elastic modulus of carriage, rail, and ball [GPa]
- f:
-
Maximum operating frequency of the machine tool [Hz]
- f 0 :
-
Given parameter
- f 2j :
-
J-th order natural frequency [Hz]
- fmax,fmin :
-
Maximum and minimum natural frequencies [Hz]
- F1, F2 :
-
Any applied load and previous load [N]
- I :
-
Unit matrix
- m :
-
Total number of stiffness considered
- n :
-
Number of low-order natural frequencies considered
- n max :
-
Maximum speed of the machine tool spindle [r/min]
- nn :
-
Number of the roller in a groove
- N :
-
Total number of roller
- p :
-
Penalty coefficient
- P m :
-
Base point
- P :
-
Comparative matrix
- q :
-
Given parameter
- r i :
-
Ranking index (i = 1,2,…, n)
- rmax, rmin :
-
Maximum and minimum stiffness of ranking index
- S1i(k):
-
Vertical and horizontal stiffness (i = 1,2) [N/um]
- Smax, Smin :
-
Maximum and minimum stiffness [N/um]
- V1, V2 :
-
Poisson’s ratio of carriage, rail, and ball
- ZB :
-
Middle preload [N]
- β :
-
Contact angle [°]
- δ1,δ2 :
-
Deformation at a certain load [um]
- λ max :
-
Maximum eigenvalue
- ω :
-
Corresponding eigenvector
- ω i :
-
Weighting coefficients
- ωij :
-
Weighting coefficients
- ΔF :
-
Relative load
- Δδ :
-
Relative deformation
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Acknowledgments
The authors gratefully acknowledge the support of the National Science and Technology Major Project of the Ministry of Science and Technology of China (Grant No. 2015ZX04014-021-03).
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Recommended by Editor Seungjae Min
Yali Ma obtained her B.D., M.D., and Ph.D. in Mechanical Engineering from Dalian University of Technology, Liaoning, P.R. China. She is a Professor of Mechanical Engineering at Dalian University of Technology, and a member of China Mechanical Design Institute Committee. Her research interests include intelligent design, performance and structure collaborative optimization design.
Jiayong Wei, M.D., is affiliated in School of Mechanical Engineering, Dalian University of Technology, Liaoning, P.R. China. His research interests are structural optimization design and performance evalua-tion.
Cancan Li, M.D., is affiliated in School of Mechanical Engineering, Dalian University of Technology, Liaoning, P.R. China. His research interests are structural optimization design, digital design of mechanical equipment.
Chen Liang, M.D., is affiliated in School of Mechanical Engineering, Dalian University of Technology, Liaoning, P.R. China. His research interests are structural optimization design, digital design of mechanical equipment.
Guochao Liu, M.D., is affiliated in School of Mechanical Engineering, DLUT, Liaoning, P.R. China. His research interests are structural optimization design and performance evaluation.
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Ma, Y., Wei, J., Li, C. et al. Fuzzy comprehensive performance evaluation method of rolling linear guide based on improved analytic hierarchy process. J Mech Sci Technol 34, 2923–2932 (2020). https://doi.org/10.1007/s12206-020-0624-3
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DOI: https://doi.org/10.1007/s12206-020-0624-3