Six Sigma methodology applied to minimizing damping lag in hydraulic shock absorbers

• Autorzy: Czop, P. , Sławik, D. , Włodarczyk, T. H. , Wojtyczka, M. , Wszołek, G.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The aim of this paper is to identify the root cause of the temporary decrease of the damping force during the early stage of the compression phase of the stroking cycle, the so called damping lag, to describe measures of the phenomenon and to present methods for optimizing the design towards minimizing this (negative) effect. Design/methodology/approach: Theoretical background is presented in a constructive and computable manner with emphasis on measurement data analysis and MATLAB/Simulink modeling. Six Sigma tools were used to validate the model statistically and, more importantly, to propose a method of data-driven optimization of the design. Findings: Root cause of the occurrence of the damping lag was confirmed during model validation to be caused by oil aeration. The dependence of the damping lag on parameters is nonlinear. Six Sigma methodology proved to be useful in achieving design optimality. Research limitations/implications: Statistical model and conclusions drawn from it are only valid in the interior of the investigated region of the parameter space. Additionally, it might not be possible to find a local minimum of the aeration measure (damping lag) inside the selected region of the parameter space; global minimum located at the boundary might be the only possible solution. Practical implications: Optimal value of parameters is not unique and thus additional sub-criteria (cost/ durability) can be imposed. Conducting tests in an organized manner and according to the Six Sigma methodology allows for expediting the design optimization process and eliminating unnecessary costs. Originality/value: : Improvements in understanding and measuring aeration effects constitute a clear foundation for further product optimization. Signal post-processing algorithms are essential for the statistical analysis and are the original contribution of this work.

Słowa kluczowe

EN

Statistic Methods; Six Sigma; shock absorber; aeration

• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2011
• Tom: Vol. 49, nr 2
• Strony: 243--250
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Czop, P.

• Tenneco Automotive Eastern Europe, Eastern European Engineering Center (EEEC), Control and Measuring Systems Department, ul. Bojkowska 59 B, 44-100 Gliwice, Poland,

autor

Sławik, D.

• Tenneco Automotive Eastern Europe, Eastern European Engineering Center (EEEC), Control and Measuring Systems Department, ul. Bojkowska 59 B, 44-100 Gliwice, Poland

autor

Włodarczyk, T. H.

• Tenneco Automotive Eastern Europe, Eastern European Engineering Center (EEEC), Control and Measuring Systems Department, ul. Bojkowska 59 B, 44-100 Gliwice, Poland

autor

Wojtyczka, M.

• Institute of Engineering Processes Automation and Integrated Manufacturing Systems, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Wszołek, G.

• Institute of Engineering Processes Automation and Integrated Manufacturing Systems, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

Bibliografia

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• [7] H. Lang, A study of the characteristics of automotive dampers at high stroking frequencies, PhD thesis, Michigan, 1977.
• [8] N.K. Morman Jr., Modeling and identification procedure for the analysis and simulation of hydraulic shock absorber performance, Ford Motor Company, Michigan, 1984.
• [9] M.S. Tallbot, J. Starkey, An experimentally validated physical model of a high performance mono-tube damper, Proceedings of the 2002 SAE Motorsports Engineering Conference and Exhibition, US, 2002.
• [10] O. Beyer, B. Becher, M. Stüwing, G. Zimmermann, Measurement and simulation of the hydraulic behavior of the piston valve in a monotube shock absorber, Proceeding of the 7th International Conference ATA, Italy, 2002.
• [11] MATLAB-SIMULINK documentation, Mathworks Inc., 2005.