Increasing adjustability of acoustic system properties by activating fixed control levers
* Presenting author
Abstract:
For several decades car acoustic optimization studies have been conducted on early design phases, directly including sound criteria as optimization objectives. As a result, any subsequent conceptual design changes lead to deviations from the determined acoustic behavior and consequently to a lack of predictive ability. Increasing the sensitivity of acoustic criteria with respect to a set of design parameters ensures leverages for acoustic adjustments on arbitrary design stages, solving the issue. A new acoustic optimization method was developed based on pre-defined design components and their parameter properties to be activated. The sensitivities of the sound pressure sum level acoustic response concerning the pre-defined variables were used directly as optimization goals. Thus, maximizing the chosen sound criterion sensitivity regarding specific design parameters, one receives leverages for acoustic manipulations and adjustments. A simplified fluid-structure coupled FE model was implemented to conduct the optimization studies. Once the sound pressure sum level sensitivities with respect to the selected parameters were maximized, the sound pressure level curve got flattened with changing the activated parameter values. The optimization was thus predominantly concentrated on major sound pressure level peaks. In contrast, varying parameters, whose influence was minimized, resulted in no significant effect on sound pressure level distribution.