Abstract: There is provided a self-muffling acoustic duct assembly for noise attenuation in a vehicle. The self-muffling acoustic duct assembly includes a duct with two or more reinforced thermoplastic composite laminate layers forming a duct structure and having a plurality of openings for noise to travel through. The duct includes a thermoplastic film sealing layer embedded between the reinforced thermoplastic composite laminate layers. The thermoplastic film sealing layer forms a barrier to prevent leakage of air from the duct and is transparent to the noise traveling through the duct. The self-muffling acoustic duct assembly further includes an insulation and noise attenuating layer coupled to, and covering, the duct structure, and a thermoplastic film outer layer coupled to the insulation and noise attenuating layer. The duct allows transmission of noise through the duct and into the insulation and noise attenuating layer, while avoiding use of separate zone mufflers.

Abstract: There is provided a self-muffling acoustic duct assembly for noise attenuation in a vehicle. The self-muffling acoustic duct assembly includes a duct with two or more reinforced thermoplastic composite laminate layers forming a duct structure and having a plurality of openings for noise to travel through. The duct includes a thermoplastic film sealing layer embedded between the reinforced thermoplastic composite laminate layers. The thermoplastic film sealing layer forms a barrier to prevent leakage of air from the duct and is transparent to the noise traveling through the duct. The self-muffling acoustic duct assembly further includes an insulation and noise attenuating layer coupled to, and covering, the duct structure, and a thermoplastic film outer layer coupled to the insulation and noise attenuating layer. The duct allows transmission of noise through the duct and into the insulation and noise attenuating layer, while avoiding use of separate zone mufflers.

Abstract: A fluid flow restrictor device for controlling fluid flow at a connection between ducts may include a restrictor device body that is partially or fully inserted into and disposed within one of the ducts and an outboard restrictor device flange extending radially outward at an outboard end of the restrictor device body and having an outboard flange outer diameter that is greater than an inner diameter of the ducts so that the restrictor device body or the outboard restrictor device flange is engaged by an open end surface of the duct to prevent full insertion of the fluid flow restrictor device into the duct. A body inner surface defines a restrictor opening through the restrictor device body that can be varied to achieve desired fluid flow characteristics at the connection.

Abstract: A fluid flow restrictor device for controlling fluid flow at a connection between ducts may include a restrictor device body that is partially or fully inserted into and disposed within one of the ducts and an outboard restrictor device flange extending radially outward at an outboard end of the restrictor device body and having an outboard flange outer diameter that is greater than an inner diameter of the ducts so that the restrictor device body or the outboard restrictor device flange is engaged by an open end surface of the duct to prevent full insertion of the fluid flow restrictor device into the duct. A body inner surface defines a restrictor opening through the restrictor device body that can be varied to achieve desired fluid flow characteristics at the connection.