Squeak and Rattle Prediction for Robust Product Development in the automotive industry
Doctoral thesis, 2021
The available tools and methods for the prediction of squeak and rattle sounds in the pre-design-freeze phases of a car development process are not yet sufficiently mature. The complexity of the squeak and rattle events, the existing knowledge gap about the mechanisms behind the squeak and rattle sounds, the lack of accurate simulation and post-processing methods, as well as the computational cost of complex simulations are some of the significant hurdles in this immaturity. This research addresses this problem by identifying a framework for the prediction of squeak and rattle sounds based on a cause-and-effect diagram. The main domains and the elements and the sub-contributors to the problem in each domain within this framework are determined through literature studies, field explorations and descriptive studies conducted on the subject. Further, improvement suggestions for the squeak and rattle evaluation and prediction methods are proposed through prescriptive studies. The applications of some of the proposed methods in the automotive industry are demonstrated and examined in industrial problems.
The outcome of this study enhances the understanding of some of the parameters engaged in the squeak and rattle generation. Simulation methods are proposed to actively involve the contributing factors studied in this work for squeak and rattle risk evaluation. To enhance the efficiency and accuracy of the risk evaluation process, methods were investigated and proposed for the system excitation efficiency, modelling accuracy and efficiency and quantification of the response in the time and frequency domains. The demonstrated simulation methods besides the improved understanding of the mechanisms behind the phenomenon can facilitate a more accurate and robust prediction of squeak and rattle risk during the pre-design-freeze stages of the car development.
squeak and rattle
finite element analysis
Chalmers, Industrial and Materials Science
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SAE International Journal of Advances & Current Practices in Mobility,; Vol. 3(2020)p. 1081-1091
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Paper in proceeding
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Journal of Computing and Information Science in Engineering,; Vol. 22(2022)
Analysis of sound characteristics to design an annoyance metric for rattle sounds in the automotive industry
International Journal of Vehicle Noise and Vibration,; Vol. in press(2021)
For decades, customer complaints about squeak and rattle have been among the top sound quality issues in the automotive industry, burdening high warranty costs to the car manufacturers. Today, the quieter in-can environment due to improvements in the operational sound quality of the car subsystems, as well as the increasing popularity of electric engines, as green and quiet propulsion solutions, stress the necessity for attenuating annoying sounds like squeak and rattle more than in the past.
To rectify squeak and rattle problems in a robust, sustainable and economic way, it is needed to address the problems during the design stage of the car, where concept-related changes are economically justifiable.
This research investigates the development and application of methods and tools in different engaged fields to enable the detection and rectification of squeak and rattle risk during the car design stages.
Squeak and Rattle Prediction for Robust Product Development
Volvo Cars, 2016-08-01 -- .
Production Engineering, Human Work Science and Ergonomics
Fluid Mechanics and Acoustics
Areas of Advance
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 5020
Chalmers University of Technology
Virtual Development Laboratory (VDL), Hörsalsvägen 7A, and Via Zoom
Opponent: Professor Mohamad Qatu, Eastern Michigan University, United States