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Kim J.,University of Cincinnati | Lee G.-J.,University of Cincinnati | Choi J.M.,VP Korea Inc. | Kim Y.-J.,VP Korea Inc.
SAE Technical Papers | Year: 2015

Squeak and rattle (S&R) problems in body structure and trim parts have become serious issues for automakers because of their influence on the initial quality perception of consumers. In this study, various CAE and experimental methods developed by Hyundai Motors for squeak and rattle analysis of door systems are reported. Friction-induced vibration and noise generation mechanisms of a door system are studied by an intelligent combination of experimental and numerical methods. It is shown that the effect of degradation of plastics used in door trims can be estimated by a numerical model using the properties obtained experimentally. Effects of changes in material properties such as Young's modulus and loss factor due to the material degradation as well as statistical variations are predicted for several door system configurations. As a new concept, the rattle and squeak index is proposed, which can be used to guide the design. The predicted S&R of the door system from the CAE process were compared with experimental results. Practical applications of the developed process and possible future directions of CAE based S&R analysis are discussed. Copyright © 2015 SAE International. Source


Choi J.M.,VP Korea Inc. | Lyu S.J.,VP Korea Inc. | Seol Y.S.,VP Korea Inc. | Jun I.K.,VP Korea Inc. | Yi C.,NVH KOREA Inc.
SAE Technical Papers | Year: 2013

The BSR(Buzz, Squeak and Rattle) noise is the perceived noise of annoyance and caused by impact or friction in the gap between parts of a system. It is one of the major factors that influence the perception of quality. The BSR noise emerges along the gap, joint and contact surface of a system under external forces such as the road loads and the engine vibration input. Major causes of BSR phenomena are the degradation of materials and the resonance characteristics of a system. BSR issues can be generally found in the field, after the system has seen several cycles of use. BSR issues are challenging to find in the virtual development stage. Our aim is to develop BSR evaluation process driven by CAE, in order to identify the occurrence of BSR at the early stage of the design. Whereas subjective evaluations have been typically required in order to assess the perception of quality, a virtual evaluation method is proposed in this study. An analytical methodology is presented here to detect the location and threshold level of BSR, through a finite element analysis for a gap model and a pre-loaded model. Implicit and explicit FEA and sound generation will be addressed in this study. The effect of environmental and material property changes is considered in the time domain transient analysis used to predict sound. Copyright © 2013 SAE International. Source


Lyu S.J.,VP Korea Inc. | Jun I.K.,VP Korea Inc. | Choi J.M.,VP Korea Inc. | Lee W.K.,NVH KOREA Inc. | Woo J.C.,Duckyang Ind. Co.
Transactions of the Korean Society of Mechanical Engineers, A | Year: 2013

BSR noise emerges in a vehicle as a result of road vibrations, engine vibrations, and speaker vibrations. BSR noise occurs with an irregular impact or stick slip friction phenomenon as the influence of the resonance mode when the vibration input load is transferred along poor joint and contacting pairs of the system. A sub-structure method of finite element analysis is required to detect impacts and slip in the full vehicle model. This study presents a method for substructure modeling and a rattle and squeak detection methodology that considers the characteristics of road vibration inputs. © 2013 The Korean Society of Mechanical Engineers. Source


Kim J.H.,VP Korea Inc. | Jun I.K.,VP Korea Inc. | Choi J.M.,VP Korea Inc. | Kim S.H.,VP Korea Inc.
Transactions of the Korean Society of Mechanical Engineers, A | Year: 2010

It is requested that the interior compartment of a passenger vehicle must be satisfied with the FMVSS201U regulation, FMH impact test. It is needed the design methodology to find the appropriate structure about the FMH impact. When designing the impact-absorbing structure for the FMH impact test, it is to be noted that the impact absorber must have different performance considering the stiffness of the vehicle as the impact position and approach angle of FMH. In this study, an efficient design methodology was developed by using subcomponent collapse simulation instead of conducting full-vehicle simulation, thereby reducing the time and resources spent. Further, this unit-model simulation helps optimize the impact absorbing structure. © 2010 The Korean Society of Mechanical Engineers. Source

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