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AI InsightThe findings of the study are an important example for the selection and optimization of acoustic insulation materials and will contribute to the development of more effective insulation solutions in the automotive industry.
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Abstract
Passenger comfort is an important parameter in the design process of the car. Noise caused by many factors in the vehicle significantly affects passenger comfort. Insulators are used to reduce noise and these insulators are usually made of fibrous or porous petrochemical-based materials. Recently, natural materials have begun to replace petrochemical-based materials due to environmental and health problems. Natural fiber materials offer alternatives such as felts made from recycled cotton, hemp, and kapok fibers. These materials have various acoustic performance properties depending on their density, thickness, and structural differences. There are some tests performed to evaluate the performance of materials for specific uses. To evaluate the acoustic performance of the felt, parameters such as sound absorption coefficient and sound transmission loss are considered. In the tests performed using an impedance tube and a reverberation chamber, it was investigated how the properties of the material affected these parameters. The results were that at higher thickness and density, sound absorption generally increased, while sound transmission loss decreased. The findings of the study are an important example for the selection and optimization of acoustic insulation materials and will contribute to the development of more effective insulation solutions in the automotive industry.