Abstract
Keywords - Running modes, operational deflection shapes, closures, transmissibility function, crosspower spectrum
Abstract - Closures (doors, hood, tailgate, etc.) are attached to the vehicle body by means of articulated elements that allow a high level of mobility. This may cause the poor vibration performance of the closure when exposed to oscillating loads such as the ones produced by the engine, road irregularities and aerodyna mic forces. The poor vibration performance of a closure can cause squeak & rattle or lead to a high level of wind noise inside the ve hicle. The problems associated with small displacements of closures during driving conditions can be analysed in terms of the relative movement of these elements with respect to the vehicle body. This relative movement can be considered as a three-dimensional displacement and rotation, and its quantification allows us to detect the areas between the closures and the body that need special attention.
This paper proposes an experimental method for decomposing the in-service relative movement of closures as the sum of two components, i.e., a rigid body motion contribution and the vibration motion part. It is shown that this approach is of particular interest in defining countermeasures to control closure displacements.