High-precision acoustic measurement for every vehicle
AIP Acoustic roller test bench for realistic noise analysis under controlled conditions
The acoustic all-wheel roller test bench enables realistic and independent measurements of wind and rolling noise – completely independent of weather conditions and under highly reproducible conditions. The modular, flexibly configurable design allows different test modules to be changed quickly without moving the vehicle, thus supporting efficient test procedures in the development phase.
By combining defined driving conditions on the roller test bench with precisely controllable flow conditions in the aeroacoustic environment, noise phenomena such as tire rolling noise, body noise, or aerodynamic factors can be clearly separated and analyzed. The system thus creates a realistic representation of typical noise sources in modern vehicles – from quiet electric drives to complex body structures – and provides a consistent basis for comparative tests, variant evaluations, and the optimization of interior and exterior noise comfort.
Advantages
- Independent analysis of wind and rolling noise: Rolling and wind noise can be examined separately or in combination, as rolling noise can be realistically simulated even without airflow.
- Reproducible test conditions: Constant, weather-independent driving conditions enable reliable comparative tests and variant evaluations.
- Realistic driving scenarios: The rollers generate authentic tire-road noise, which is particularly important for quiet electric vehicles.
- Quick configuration changes: The modular design allows test modules to be exchanged quickly without having to move the vehicle.
- Clear separation of noise sources: Defined load conditions and speeds enable the precise separation of rolling, drive, and structural noise.
Application
- Acoustic evaluation of real driving conditions: Analysis of typical speed and load situations in quasi-real driving conditions.
- Investigation of tire and rolling noise: Evaluation of the noise behavior of different tire types and designs.
- Testing of aerodynamic and structural modifications: Analysis of the influence of changes to the underbody, bodywork, or add-on parts on noise behavior.
- Analysis of drive and transmission noise: Investigation of the acoustic effects of electric and conventional drives under defined loads.
- Variant and component comparisons: Direct acoustic comparison of different vehicle or component variants in the development process.
Aeroacoustic wind tunnel – where vehicle acoustics come to life
Realistic driving conditions under controlled conditions
The all-wheel drive roller test bench enables the precise simulation of real driving conditions thanks to independently controllable drive rollers that synchronously simulate speeds, slip conditions, and load points. This allows typical operating situations such as constant speed, partial load, load changes, or speed increases to be analyzed acoustically under constant boundary conditions – without disruptive influences such as varying asphalt conditions, air turbulence, or weather influences.
Detailed analysis of tire and rolling noise
Defineable rolling resistance, variable contact forces, and precisely adjustable circumferential speeds enable tire-roller interactions to be generated with a high degree of reproducibility. The acoustically optimized roller surface minimizes extraneous noise and supports the identification of frequency-specific rolling noise components, resonance effects in the chassis, and structural transmissions into the body – crucial for NVH optimization of modern chassis and tire concepts.
Modular design for variable test environments
The modular test platform enables the rapid exchange of test environments such as glass floor modules for optical measurement methods, integrated weighing modules for load measurements, or alternative underbody layouts for investigating aerodynamic acoustic influences. The vehicle position remains unchanged, ensuring that the geometry, microphone positioning, and measurement chain remain consistent – a crucial factor for valid acoustic comparison series.
Isolated investigation of drive and transmission noises
Precisely controllable motor and transmission mappings allow the noise signatures of the electric motor, inverter, planetary gearbox, and auxiliary units to be recorded separately from one another. The test bench enables stable speed and torque specifications that support the acoustic analysis of speed-dependent orders, harmonic excitations, and structure-bound transmission paths – an essential tool for NVH analyses of electrified powertrains.
Reproducible framework conditions for variant and component comparisons
Constant operating parameters such as speed, temperature, rolling resistance, contact forces, and load specifications ensure reproducible test conditions. This allows the acoustic effects of different tire models, chassis configurations, body materials, or underbody modifications to be objectively compared and clearly evaluated in development loops – without the influence of variable road noise, environmental loads, or weather conditions.