Considerable progress has been achieved in recent years in understanding the physics of axle system gear noise. Using computer-aided engineering (CAE) tools such as FEA to analyze system dynamics in regard to gear noise have been found to be extremely successful. In most applications, linear system assumption is satisfied, and a modeling approach called the building-block method has proven to be efficient and accurate. In dealing with gear mesh geometry, a simplified linear gear-mesh model developed by Steyer is widely used. Despite the success of applying simulation tools in design/tuning of system dynamics to achieve a quiet system for a particular vehicle platform, it is even more important that the product has robustness in NVH performance in the following aspects: The system meets the NVH requirements in the presence of 'variability' due to both manufacturing process capability and environmental/operating conditions. The axle subsystem exhibits minimized system sensitivity to different vehicle platforms. A study of axle system noise, vibration, and harshness (NVH) performance using design for six sigma (DFSS) methods is presented with a focus on system robustness to typical product variations (manufacturing-based tolerances). Instead of using finite-element analysis (FEA) as the simulation tool, a lumped-parameter system dynamics model developed in MATLAB/Simulink is used in the study. This provides an efficient way to conduct large analytical design of experiment (DOE) and stochastic studies. The model's capability to predict both nominal and variance performance is validated with vehicle test data using statistical hypothesis test methods. Major driveline system variables that contribute to axle gear noise are identified and their variation distributions in production are obtained through sampling techniques. Through analytical DOE and analysis of variance (ANOVA) analyses, the critical design parameters that control system NVH variations with respect to product variations and variations due to operating conditions are covered. Design criteria of axle systems with respect to robust NVH performance are also discussed.
Manufacturing tolerances and axle system NVH performance
Fertigungstoleranzen und NVH-Verhalten von Achssystemen
Sound and Vibration ; 40 , 4 ; 12-19
2006
8 Seiten, 18 Bilder, 9 Quellen
Aufsatz (Zeitschrift)
Englisch
Fahrzeugbau , Achse (Maschinenelement) , Antriebstechnik , Mechanik , Akustik , mathematisches Modell , Finite-Elemente-Methode , numerische Simulation , Fertigungstechnik , Toleranz , Genauigkeit , Stochastik , Varianzanalyse , CAE (rechnerunterstützte Technik) , dynamisches Verhalten , Verzahnung , Getriebe , Schwingungsanalyse
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