products NVH Test Systems for the Powertrain AVL offers its customers test systems for powertrain NVH optimization – from customized solutions for individual components to complete turnkey systems including facility engineering. 3 0 F o c u s dynamometers are set up in different rooms, it is usually necessary to have output shafts with a length of several meters, which present a particular constructive challenge. With all the additionally required systems like e. g. battery simulators being available, even hybrid drives can be developed with AVL NVH test beds. “One of the unique AVL advantages when designing NVH test beds is that we carry out automotive acoustic developments right here in-house. For that reason, we are very familiar with testing tasks – a fact which our customers appreciate very much when we design the test systems together. This puts us in a perfect position as suppliers of complete NVH systems, from the concept to the complete turnkey system, for our customers around the globe,” says Joachim Schmidt. < Modern cars – specifically ones with electrified drives – are getting quieter and quieter. This puts greater emphasis on the powertrain and its role as a source of noise. The tools needed to optimize powertrain components as well as entire powertrains in view of their noise and vibrations are called NVH test beds (NVH, Noise, Vibration and Harshness). “These are very different from conventional test beds, mainly due to the sound insulating measures that have to be taken and the way the dynos are set up. With these being a source of sound themselves, they need to be accommodated separately, in different rooms. Apart from that, the individual elements of the test bed, specifically the test cell itself, have to be acoustically decoupled and protected against vibration,” says Joachim Schmidt, Manager of NVH Test Bed Systems at AVL. Right now, customers of AVL are mainly asking for NVH powertrain test beds, of which there are essentially two different types: transmission NVH development usually requires the use of a 2WD test bed with a highly dynamic electric drive unit, which is installed (acoustically insulated) inside the test cell as close to the tested transmission as possible in order to enable a dynamic connection to the unit under test. Based on software models, the so-called prime mover can simulate the torsional vibration behavior of a variety of engines. In the case of the second well- established type of NVH powertrain test bed, which is usually ordered as a 4WD version, the applied drive is usually that of the vehicle’s engine itself. If special kinds of measurements are needed, the acoustically dominant engine can be encased and/or replaced by an e-machine. Due to the way the > 4WD NVH powertrain testcell with special reduction of acoustic reflections. Due to the way the dynamometers are set up in different rooms, it is necessary to have output shafts with a length of several meters.
Focus 2013 1 E
To see the actual publication please follow the link above