A STUDY ON DOOR CLIPS AND THEIR INFLUENCE ON BSR PERFORMANCE 2019-01-1468
Squeak and rattle concerns account for approximately 10% of overall vehicle Things Gone Wrong (TGW) and are a major quality concern for automotive OEM’s. Door abnormal noises is one of the top 10 IQS concerns under any OEM nameplate. Door trim is one of the parts in closure assembly that significantly contributes to overall BSR quality perception. Door trim is mounted on door in white using small plastic clips and variability in clip properties can cause the overall variability in BSR performance. Here an attempt in made to evaluate the squeak and rattle performance of various door clips through objective parameters like interface dynamic stiffness and system damping. The methodology talks about using a simple dynamic system and evaluate stand-alone performance of clip. Transmissibility is calculated from the dynamic response of a mass supported by clip, later interface stiffness and damping are evaluated for different clips. The study is carried out for different clips to extract features that leads to different interface stiffness and system damping. Also, variation of inner panel thickness is considered to compare the variation in clip performance. In a second step, these features are transferred to an equivalent finite element model to predict the response of mass supported by clip. The equivalent clip model identified using the method is compared with generic clip model for analyzing squeak and rattle simulation in a door assembly. Prior to this, a satisfying agreement was achieved between measured and simulated response of clip. An engineering approach is presented for defining targets for selection of door clips in product development process to avoid rattle issues in door trims.
Riyazuddin Mohammed, Prasath Raghavendran, Naresh Chaudhari, Amit Kumar
Mahindra & Mahindra Ltd
Noise and Vibration Conference & Exhibition