/ 93 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 simulate real 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 “passby noise” tests. 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 engines 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. 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. Testing of pass-by-noise on the AVL vehicle testbed AVL ROADSIM NVH 4x4 LIGHT TRUCK 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 due to structural measures (e.g. engine enclosures, water cooling and suitable roller design) in the testbed design • Simulation of real road textures due to exchangeable roller surfaces, also for speeds above 200km/h • Excellent cooperation with planning engineers, construction and acoustic construction companies Microphone noise recording on a passenger vehicle in a NVH chamber
Solutions Katalog 2015_E
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