Liftgate Structure Optimization to Minimize Contribution to Low Frequency Interior Noise
This paper presents the design development of a SUV liftgate with the intention of minimizing low frequency noise. Structure topology optimization techniques were applied both to liftgate and body FEA models to reduce radiated sound power from the liftgate inner surface. Topology results are interpreted into structural changes to the original liftgate and body design. Favorable results of sound power performance with reduced cost and mass is shown compared to baseline liftgate and baseline with TVA (tuned vibration absorber). This simulation includes finite element modeling of coupled fluid/structure interaction between the interior air cavity volume and liftgate structure. In addition to sound power minimization, multi-model optimization (MMO) was used on separate models simultaneously to preserve liftgate structural performance for several customer usage load cases.