A sound absorbing structure utilizes the vibration of a plate-like body (1), and includes the plate-like body (1), a vibration damping member (2) provided on at least one surface of the plate-like body (1), and an installation portion (3) provided at an opposite side of the vibration damping member against the plate-like body (1).

Sound absorbing structure

The present invention is a physical barrier for sealing an orifice (4) in a panel member (2). The physical barrier includes a carrier (12) that has one or more locating pins (18) mounted on it. The pins (18) are adapted to located the carrier (12) in the orifice (4). The physical barrier also includes a sealing material (14) attached to the carrier. The present invention also includes a method of installing the physical barrier into an orifice (4) of a panel member (2).

Orifice sealing physical barrier

The present invention is a physical barrier for an orifice in a panel member which includes a plastic carrier and a patch adapted to adhere to said carrier and the panel member. The present invention also includes a method of sealing an orifice in a metal panel member with a plastic carrier. Lastly, the present invention includes a thermoplastic which adheres to both plastic and metal upon the application of heat.

An acoustic barrier that achieves excellent noise insulating properties, and is relatively thin and relatively light in weight includes a flexible thermoplastic barrier layer having a plurality of apertures defining a latticed structure which includes apertures for pass-through components and non-pass-through apertures. The non-pass-through apertures are located where noise levels are expected or known to be relatively low. Effective acoustic performance can be maintained by completely eliminating material from the relatively thick and dense barrier layer at the low noise levels areas, and providing only absorptive decoupler material and/or lightweight sheet material such as plastic films in those areas.

Vehicle acoustic barrier

A thermoformable acoustic sheet material that is lightweight and provides excellent sound attenuation over a wide range of frequencies includes a combination of sound attenuating materials, including an acoustic barrier having a relatively high density, a thermoformable sound absorbing layer having a relatively low density, a substantially air-impermeable layer between the barrier and the sound absorbing layer, and an acoustic performance enhancing scrim or perforated thermoplastic film on the opposite side of the sound absorbing layer. The combination is useful for preparing contoured acoustic treatments for reducing sound transmission from the engine compartment of a vehicle to the passenger compartment of the vehicle.

Acoustic absorber/barrier composite

An acoustic barrier for mounting to a barrier wall, such as a barrier wall between an engine compartment and a passenger compartment of a vehicle. The barrier wall has multiple indentations forming an uneven surface. The acoustic barrier comprises a decoupling layer and a mass layer. The mass layer has a series of projections formed on a rear surface, which coincide with the indentations of the barrier. When the decoupling layer is mounted to the rear wall of the mass layer, the projections alter the shape of the decoupling layer to conform with the shape of the barrier layer.

Matthew J. Holwerda

Papers

Acoustical barrier with decoupler