1996-02-01

Development of a High-Performance Dash Silencer Made of a Novel Shaped Fiber Sound-Absorbing Material 960192

Interior quietness has been improved year by year until it has now become one of the basic performance requirements of vehicles. Traditional approaches to assuring quietness have been to increase the weight of sound insulation barriers or to enlarge sound insulation space. Such methods run counter to the aims of reducing vehicle weight and providing a more spacious interior.In this research, an attempt was made to overcome this trade-off by adopting a new material for the sound-absorbing material used in vehicles. The newly developed-sound absorbing material consists mainly of modified cross-section polyester fabric. It provides noticeably higher sound-absorbing performance than traditional material like shoddy or formed urethane. This is attributed to increased friction between the fibers and air, owing to the greater surface aria of the modified cross-section polyester fiber compare with that of the circular cross-section of ordinary fibers at an identical weight. Another feature of the new material is its excellent recyclability since it is made of polyester.A trial application of the new material to the dash silencer produced a 2-4 dB improvement in sound-absorbing performance in a frequency range of 300 Hz to 1 KHz, while providing a weight saving of 35%. These results indicate it can improve interior quietness without increasing the vehicle weight or detracting from available interior space

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