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1、400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2003-01-3426 Reliable Pre-Design of Commercial Vehicle Rotating Suspension Components Oliver Ehl Stress $?+P?P phi calcz calcz measphi meas -3,00E-04 -2,00E-04
2、 -1,00E-04 0,00E+00 1,00E-04 2,00E-04 3,00E-04 4,00E-04 5,00E-04 6,00E-04 7,00E-04 060120180240300360 DQJOH?LQ? VWUDLQ?P?P phi calcR calcR measphi meas First a numerical stress analysis related to the SAEJ267 radial drum test was performed. In the following the stress distribution for one calculatio
3、n step and the stress-time history during a wheel revolution are shown. Fig 9: LBF.WheelStrength stress analysis on a heavy truck for SAE J267 test a) stress distribution for one calculation b) nodal stress time history Fig 10: LBF.WheelStrength fatigue evaluation for European usage conditions RFS p
4、lot on the ventilation hole Additionally, a fatigue assessment was carried out for European usage conditions. The damage accumulation results in the RFS values (see Fig. 10), which highlight the possible critical areas of the wheel. Furthermore nodal stress-time histories for the relevant physical l
5、oad cases and local design spectra can be created. Using all these results calculated under realistic conditions, an optimum pre-design can be found. Wheels or wheel hubs can be optimized in a very early development stage. OUTLOOK The method presented is going to be applied for identify- ing a tire
6、model applicable for new developed super single tires that were recently introduced in the US. Together with European commercial vehicle producers and wheel manufacturers the Fraunhofer LBF has already determined a corresponding load program for the biaxial test facility. Fig 11: A 17x22.5“ super si
7、ngle wheel in one of the LBF biaxial test facilities All determined data (tire model, load data and design spectra) will be integrated in LBF.WheelStrength. CONCLUSION With the technique described a reliable method for stress analyses and the fatigue assessment of wheels and wheelhubs was created. C
8、omparison between calculated and measured results shows close agreement. The technique can be applied in the early design phase of rotating components. Using a sophisticated tire model and load spectra for various loading conditions a good judgement is possible due to the underlying realistic assump
9、tions. And most important, the results are comparable to standard tests like the SAE J267 radial fatigue test or to the biaxial wheel fatigue test. At the moment the latter is being drafted for a new SAE standard. In this way, the use of the above-mentioned software concept substan- tially improves
10、and optimizes the development process of wheels and hubs. REFERENCES 1 Rupp, A.; Heinrietz, A.; Ehl, O.: Simulation of the experimental proof out of wheels and hubs. SAE 02AC-55 (2002) 2 Heinrietz, A.; Lehrke, H.-P.; Rupp, A.; Barthel, C.: Identification of Parametric Tire Models for the Fatigue Evaluation of Suspension Components SAE 2003-01-1276 (2003) 3 Heinrietz, A.; Lehrke, H.-P.; Ehl, O.: Reliable stress calculation for rotating suspen- sion components by identification of parametric tire models NAFEMS Seminar 2002: Validation of FEM Analysis Models and Results (2002)