/ 93 Vehicle Testbeds for NVH Testing The main purpose of noise, vibration and harshness testing is the reduction of interior and exterior vehicle noise as well as design and quality assurance. The vehicle testbed is designed for transient testing requirements. CHARACTERISTICS Engine enclosures etc. reduce the acoustic emissions of the vehicle testbed. A special acoustic damping material and design is implemented 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 “pass-by-noise” tests. The vehicle testbed can be upgraded with a second axle 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 exact control and monitoring functions for transient asynchronous and synchronous test modes for all of the NVH vehicle testbed configurations. APPLICATION The vehicle testbed is designed to examine the 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. By simulating different types of powertrain configurations, the excitation of the chassis can be evaluated on the vehicle testbed. Testing of pass-by-noise on the AVL vehicle testbed AVL ROADSIM NVH 4x4 LIGHT TRUCK BENEFITS AT A GLANCE • Scalable and “ready-tobuild” 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 200 km/h • Extraordinary cooperation with planning engineers, construction and acoustic construction companies Noise recording by means of microphones on a passenger vehicle wheel in an NVH chamber
Solutionskatalog2014_E
To see the actual publication please follow the link above