The automotive industry constantly improves all parts of the vehicle including engine, interior, outside parts and the outline of the car. To support this process gfai tech offers a wide range of equipment to measure and analyse all noise and vibration.
Our Acoustic Cameras and vibration analysis software are used for various aspects of automotive applications. In R&D, for example, the system is involved in optimizing engine noise, improvement of cabin noise, localizing wind noise or decreasing emission of car parts. Another application is the end-of-line test or quality assurance of the finished vehicle.
The image shows an under-hood measurement of a car. Combustion engines consist of many different parts which emit noise. The Acoustic Camera helps to precisely find out which part emits what type of sound within a few minutes. This way, engineers can quickly identify parts which need to be improved.
The driver’s and passengers' comfort in the car is one of the highest-value targets during the acoustic optimization process. In electrical vehicles, the overall sound level inside the car is much lower as the engine sound is minor. This results in new challenges because all other sound sources become much more prominent. Using the Acoustic Camera with a sphere array, the complete sound emissions inside the car can be mapped onto the 3D model of the interior. This way, unwanted sound sources can easily be identified while driving or on a test-bench.
Depending on the driving speed, the wind noise can become the most prominent noise source inside the car. Wind tunnels offer the perfect test conditions to examine the aerodynamic outline of each vehicle type. gfai tech provides customized solutions for highest precise sound source localization in wind tunnels including shear layer correction, 3D model generation and fitting, correlation analysis and many other features to find the best results.
Sources:
2016 - On 3D-Beamforming in the wind tunnel - BeBeC - Dirk Döbler, Dr. Christof Puhle, GFaI; Jörg Ocker
2014 - Correlation of parallel car interior and exterior beamforming measurements in a wind tunnel - inter.noise - Stefan Neugebauer, Reinhard Rösel, Dirk Döbler
For more information and downloads have a look at the publications.
With WaveCam, our innovative vibration analysis software that combines high-resolution video recordings and motion amplification, you can precisely visualise and analyse vibrations on complex assemblies such as car engines.
NVH (noise, vibration, harshness) analysis plays a crucial role in the development and prototyping of powertrains. WaveCam enables engineers to analyse the oscillations and vibrations of motors and drive components both on the test bench and when installed. These insights help to better understand the behaviour of powertrains and make targeted improvements to performance, safety and comfort.
Whether for combustion engines or electric motors - the requirements for quality, safety and comfort are constantly increasing, particularly in the automotive sector. WaveCam supports engineers in meeting these requirements and optimising the performance of drive components.
Take a look at the video with the examples.
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DynaBeam - Measurement of a Car Engine and Dashboard with Soundcam Mikado
You can see how the all-in-one soundcam Mikado is used to visualize sound sources on a car engine.
We show the application of our patentend solution DynaBeam on a car engine and on a dashboard. With the 3D scanner integrated in the microphone array, the geometry of the measurement object is recorded simultaneously with the recording of the acoustic data in a single measurement process. In NoiseImage the acoustic images of the different array positions are combined and mapped directly onto the 3D model.
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ACOUSTIC CAMERA: 3D Sound Source Localization Inside a Car
In this video, we show how an Acoustic Camera can be used for three-dimensional sound source localisation in enclosed spaces.
The measurement example demonstrates the use of the spherical Sphere48 AC Pro microphone array to record and analyse acoustic phenomena in a vehicle cabin.
For the measurement, the Sphere48 AC Pro array was positioned in the centre of the driver's cab so that sound sources could be recorded from all directions. Two acoustic phenomena were analysed: a rattling noise at around 1500 revolutions per minute while driving and a whistling noise that occurred when the underfloor heating was switched on. By precisely localising the reflections on the windscreen, the source of the noise was quickly identified.
The beamforming results are projected onto a 3D model of the vehicle interior, providing a clear visualisation of the problem areas. Our spherical microphone arrays are specially designed for use in enclosed spaces and are ideal for precise 3D analyses thanks to their omnidirectional pick-up capability.
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ACOUSTIC CAMERA: Leakage Detection of a Car
In this video, we show how the Acoustic Camera is used as a troubleshooting tool for noise and vibration problems. The measurement example presented demonstrates the use of the Fibonacci120 AC Pro microphone array to detect leaks in the front left side window of a car.
Small, often invisible defects such as holes, gaps or poorly fitting rubber seals can generate disturbing noises while driving and impair the driving experience. To precisely localise these leaks, we placed the Qooms2 omnidirectional sound source in the centre of the driver's cabin and played white noise. Using the acoustic camera, we were then able to detect possible leaks in the vehicle from the outside.
The video shows the results of the analysis as acoustic photos in the frequency range, which clearly illustrate how the camera visualises acoustic problem areas.
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WaveCam - Video Vibration Analysis on a Car Engine
In this video you can see how WaveCam, our innovative vibration analysis software, uses high-resolution video recordings and motion amplification to visualise and analyse vibrations on complex assemblies such as car engines. It enables engineers to precisely examine the NVH (noise, vibration, harshness) behaviour of drivetrains both on the test bench and when installed. This allows optimisation potential for combustion engines and electric motors to be identified as early as the development phase in order to meet the highest standards of quality, safety and comfort.
Modal analysis plays a key role in vehicle design. The software WaveImage features all common methods of vibration analysis – Experimental Modal Analysis (EMA), Operational Modal Analysis (OMA), Finite Element Analysis (FEA), Operating Deflection Shapes (ODS), order tracking and order analysis and many other options. When analizing parts, the automatic modal hammer WaveHitMAX is the perfect solution for highly precise single hit excitation.
