Browse Publications Technical Papers 2020-01-1556

Squeak&Rattle - New Equivalent Static Load (ESL) based on Dynamic Distortion in all Body Openings from both Test and Simulation 2020-01-1556

The body stiffness has a major impact on the Squeak&Rattle (S&R) performance of a car. Since the body structure of electrical/automated cars will differ clearly from traditional bodies, an enhanced requirement is needed to limit the distortion in the closure openings. The new requirement can be derived from a complete vehicle simulation using the deformation of the diagonals in the closure openings. This simulation includes different test tracks by using the dynamic road load data which can be obtained from a multi body simulation of a complete vehicle. Since the requirement needs to be applied early in the development only an untrimmed body model (BIG) is available, which can be used for a simplified static load. This paper shows a new approach of defining an equivalent static load (ESL), which considers both the reduction from a complete vehicle to a BIG and from a dynamic load to a static load. The approach is based on the comparison of the deformation in the diagonals of all closure openings between the dynamic simulation of a complete trimmed body and the static simulation of a BIG. The evaluation of the deformation due to a dynamic load using a modal transient analysis is based on the E-line method, which refers to SAE 2912-01-1553. In order to validate this new approach a comprehensive correlation work has been performed. The LYNK & CO 01 was driven on different test tracks with different velocities both in reality and virtually. The correlation between the measured and simulated deformation in the diagonals of all openings has been performed both in time and frequency domain. The ESL can be used as an improved body requirement by limiting the distortion in the openings. Furthermore, it can be used as input for a body optimization.


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