Localizing Sound Sources in 3D for Buzz, Squeak and Rattle
With the automotive industry trending away from the traditional internal combustion engine in favor of the more efficient, quieter electric engines, engineers are realizing “new” sound sources that were masked before. Rattling, buzzing, or clicking noises are undesired in any vehicle. Having a quick and easy method to accurately locate these sources is a valuable tool for interior NVH work. Using our solution, whether on a shaker or on a test track, to map these within a 3D model can save many hours of work finding a source that can then be used in mitigating that source.
Helping Achieve the “Right” Sound
There are many sounds that can be perceived by the consumer as being “right”. When shutting the door of an automobile, it must have that full sound the consumer expects despite the need of lightweight construction. The sound of a sports car versus the sound of a family sedan is an expected characteristic of car brands. These examples and many more is why so much effort goes into making sure the desired sound is achieved while eliminated the disturbances. The Acoustic Camera can help greatly in achieving a sound that is just right.
Reducing Underbody Noise
With the need to lower overall weight of vehicles to increase efficiency comes the need to use as little material as possible to achieve the same or higher results. This means that everything needs to be taken in consideration, including the underbody of a vehicle. There are many sources (i.e. drivetrain, exhaust, etc.) that can add to the noise heard inside the vehicle. Having a tool, the Acoustic Camera, that helps identify these sources quickly and easily becomes very valuable.
Reducing Exterior Vehicle Noise
Regulations (ISO 362, EC R41, R51, etc.) on exterior vehicle noise create the need to localize the sources as a vehicle is moving. These tests are known as Pass-by tests. These standards are in place to regulate the limits of vehicle noise emissions. The standard test set-up will tell you if a vehicle passes or fails but does not localize the source. With the Acoustic Camera we are able to determine the contributing factors to help meet the requirements of these tests.
Refining Noise Under the Hood
Anyone that has looked under the hood of a running automobile knows that many components are making noise. Being able to locate individual sources under the hood would be extremely difficult with your naked ear. The Acoustic Camera is used by many OEM’s and suppliers in completing this task quickly and easily. Understanding how a new design contributes to the overall noise of an engine is very important in achieving a desired sound.
Localizing Sound Sources in Aeroacoustic Wind Tunnel
Aeroacoustic testing is becoming more and more important in automotive design with the push for a more efficient vehicle. Small changes to the exterior of a automobile can have dramatic effects on the interior acoustics and thus the consumer’s end perception of the vehicle. Being able to pin-point the source and correlate that to what is heard inside the vehicle is very valuable. With our advanced analysis functions, such as our Wind Tunnel module, allowing for consideration of wind speed and shear layer corrections give you the ability for accurate, reliable measurements where time matters.