Sound Proofing / Insulation: Description and Operation
Low Vibration and Low Noise Body1. General
An effective application of vibration damping and noise suppressant materials reduces engine and road noise.
2. High Rigid Body for Reducing Noise and Vibration
The features listed below are used in order to ensure a high level of body rigidity against torsion, thus reducing noise and vibration.
(1) A frame material that connects the floor tunnel reinforcement and the cowl reinforcement is used in the center of the dash panel on the cabin side, in order to reduce noise and vibration.
(2) A member is used at the bottom of the dash panel, and a bulkhead is used at the connection to reduce noise and vibration~
(3) To prevent the windshield glass from vibrating, reinforcement is used in the cowl, and the joining of the front header and the roof side rail is made more n^gid~
(4) A large size sheet metal panel is used in the area that connects the front suspension support plate with the cowl panel in order to increase the rigidity of the front suspension support plate and reduce noise and vibration~
(5) A curved panel is used for most of the front floor panels in order to ensure a high level of rigidity. The frame and beads that separate the floor surface help prevent the floor panel from vibrating.
(6) Gussets connect the front floor panel, center floor panel, and the center floor cross member in order to reduce the torsion of the front floor and the center floor and suppress vibration.
(7) A gusset is provided in front of the spare wheel house in order to suppress the vibration of the spare tire.
(8) The joining rigidity of the front side member and the front cross member is increased in order to enhance dnvability.
(9) Perpendicular frames that connect the front mount of the front sub-frame with the front end of the apron upper member are used. They ensure a high level of torsional rigidity, reduce noise and vibration, and improve drivability.
(10) Two reinforcements are provided in order to reduce noise and vibration.
(11) A flat plate is provided on the front surface of the rear spring support in order to increase the rigidity of the rear spring support, minimize noise and vibration.
3. Sound Absorbing and Vibration Damping Materials
General
^ Silencers are provided on the sides of the dash panel facing the cabin interior and exterior to reduce engine noise.
^ Instead of urethane, a lightweight double-felt pad material with enhanced sound absorption characteristics is used for the inner silencer facing the cabin interior and the front floor tunnel silencer; in order to reduce noise in the vehicle intenor.
Convertible Models
^ Silencer pad and Resin formation type forming seal are applied to reduce noise.
^ Flush surfaces and double seal weather strip section are used to reduce the wind noise.
^ A dynamic damper is provided on the rear bumper reinforcement, which reduces the cowl shake.
^ A silencer pad has been adopted between the luggage front trim and the tarpaulin storage cover in order to minimize the entry of noise into the cabin.
4. Acoustic Sealing Materials
Acoustic sealing materials are provided in various areas of the body to achieve excellent sound insulation performance.
5. Weather Strips
The opening of the door is doubly sealed with door weather strips to enhance sound insulation performance.
6. Subframe Structure Double Rubber Element
The engine and the transaxle are mounted on the front suspension, and the lower arms and the steering rack are mounted via the front suspension member. These double vibration isolation measures on the body are taken to reduce engine and road noise.
Dynamic Damper
A dynamic damper is provided on the front suspension member to reduce the booming noise created by the engine.
7. Wind Noise
^ A flush-type windshield molding is used to prevent wind noise.
^ Windshield wipers are hidden by the hood to keep them out of the airflow to reduce wind-noise.