Interior sound source localization in closed cavities such as truck cabins, car interiors, aircraft cockpits or trains has been a challenge for many years because of the sound field complexity. LMS Test.Lab Interior Sound Source Localization provides a unique solution for these highly complex interior sound source localization measurements. It features a
3D acoustic camera and includes the latest innovations to localize acoustic leaks, disturbing wind noise, and squeak and rattle in difficult environments.
The LMS Test.Lab Interior Sound Source Localization solution with 3D acoustic camera uses a solid sphere to capture sound pressure levels. The innovative source localization processing takes advantage of real geometry information of the cavity, obtained either from an external file or by scanning the cavity with the sphere to get more accurate results. Using geometry information greatly improves result accuracy. Moreover, geometry information provides users with a very clear visualization of the results for powerful and convincing reports. Images captured by the built-in camera can be merged with the geometry information to obtain surprisingly realistic 3D models.
The solution offers full 3D results with one measurement. The LMS Test.Lab Interior Sound Source Localization solution with 3D acoustic camera can be used for both stationary and transient applications, as well as for correlated and uncorrelated sources.
Engineers at International Automotive Components (IAC) – the largest acoustic materials supplier to the automotive industry – use the new LMS Test.Lab High Definition Acoustic Camera to identify noise sources in seconds compared to hours and days needed with traditional methods. Using this tool, engineers gain deeper insight into acoustic behavior and shorten turnaround times in lowering interior car noise for automakers around the world.
CETENA Ship Research Center uses LMS Test.Lab for a variety of standard – and not so standard maritime equipment testing. Everything from worst case scenario shock tests to the acoustic resonant frequency of a Murano chandelier on a mega-cruise ship is subject to the expert scrutiny of the CETENA testing team in Genoa, Italy. And this team counts on the powerful LMS testing solutions that can deliver results in minutes instead of days as billion-euro projects hang in the balance.
LMS Acoustic Holography performs a spatial transformation of sound fields – meaning that it takes a measurement of sound pressures along a certain plane and predicts what the readings would be anywhere else. This can be towards the nominal source (back propagation), towards the far field, or in any other direction or plane. Special techniques are available when working in complex multisource environments. Acoustic Holography is a powerful tool that helps to solve noise source identification and quantification problems. 
Interior sound source localization is a method that lets you precisely localize the source of a sound in a vehicle’s interior, such as a car or truck cockpit, the wagon of a train or the passenger cabin of an airplane. In cavities, the sound field is called a reflective field. It is a complex sound field. Taking the example of a car’s interior, the sound is there partially reflected at some locations, such as the windows, and absorbed again at other places, such as the lining on the roof.
