/ 113 Vehicle Testbeds for NVH Testing The main purpose of noise, vibration and harshness (NVH) testing is the reduction of interior and exterior vehicle noise as well as design and quality assurance. CHARACTERISTICS Motor enclosures of the water-cooled main motors reduce the acoustic emissions of the vehicle testbed. A special design and acoustic damping material is installed within the rollers and frame. Exchangeable roller surfaces reproduce all types of road textures. The combination of reduced noise emissions, rigidity and precise road simulation allows for highly efficient NVH development on the vehicle testbed. These combined advantages are essential for dynamic, tip-in and “pass-by-noise” tests. In addition to that, the vehicle testbed can be upgraded with a second axle for example for parallel hybrid and four-wheel drive vehicles. Configurations of up to four motors are possible. In this case, the vehicle testbed controller VECON monitors the vehicle and provides precise control and monitoring functions for various test modes for all NVH vehicle testbed configurations. Pit shutters or work platforms underneath the vehicle enable comfortable access to the vehicle components. This allows the quick and easy realization of modifications without changing the vehicle restraint. Therefore, the modifications can be evaluated using identical test conditions. APPLICATION The vehicle testbed is designed to examine noise and vibration behavior as well as influences from the vehicle body, suspension or other vehicle components. The intention is mainly to check noise and vibration thresholds on the powertrain, chassis and other related components. BENEFITS AT A GLANCE • Scalable and “ready-to-build” hardware and software for noise and vibration tests per wheel, axle or vehicle • Extremely low noise emissions thanks to structural measures (e.g. motor enclosures, water cooling and suitable roller design) in the testbed design • Simulation of real road textures thanks to exchangeable roller surfaces, also for speeds over 200 kph • Decades of experience in cooperation with planning engineers, construction and acoustic construction companies Testing of pass- by-noise on the AVL vehicle testbed AVL ROADSIM NVH 4x4 LIGHT TRUCK Microphone noise recording on a passenger vehicle in an NVH chamber
Solutionskatalog2016_EN
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