Driving comfort is one of the most important factors that weigh into the new car purchase decision. For the auto manufacturer, upfront body and chassis architecture decisions must be based on accurate analysis of design alternatives taking into consideration the effect of the architecture design on all vehicle attributes, including vehicle dynamics and NVH. To support the architecture selection and subsequent production design optimization, a multi-body dynamics (MBD) CAE technique was proposed. This technique was applied to the attribute of ride comfort, specifically to the identification and optimization of road to body load transfer paths. The technique was applied to a MBD model of the suspension subsystem alone, as well to a fall vehicle model. In the case of the suspension subsystem analysis, the influence of subframe isolation on load paths into the body was shown. The results of this analysis showed the benefit of subframe isolation on ride comfort as well as a sensitivity of bushing stiffness/direction that can be used for subsequent analysis. This analysis technique could also be used to assess the effect of suspension kinematics on load transfer to body. In the case of the full vehicle MBD simulation, a sensitivity analysis of individual bushing stiffness on impact harshness behavior was conducted. The results of this analysis show the effect of suspension bushing and powertrain mount stiffness on fall vehicle response. The results are useful to the vehicle designer in order to determine which attachment points to focus on. Since this analysis combines multiple systems (front suspension, rear suspension, powertrain, body), it is also useful in assessing tradeoffs among vehicle subsystems. Using the fall vehicle MBD model, the influence of the subframe to suspension compliance split on the driving comfort was also studied. It was shown that within locus of design options with equivalent eigenfrequencies exists a compliance split between the suspension and subframe bushings that can minimize the jerk imparted to the passengers. All of the aforementioned analysis could have been conducted in hardware using conventional test methods. By using the CAE-based Driving Comfort Optimization technique described in this paper, appropriate, data driven chassis architectural decisions can be made well in advance of physical prototypes.
CAE-based driving comfort optimization for passenger cars
2014
17 Seiten, Bilder, Tabellen, 15 Quellen
Conference paper
English
CAE-based driving comfort optimization of passenger cars
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