Speed measurements under difficult environmental conditions:
For the case study, the Rotec Engineering team developed a customised miniature sensor for speed measurement on the roller tappet and used suitable measurement technology and analysis software to deriverecommendations for action.
One of the main objectives of NVH engineering is the identification and control of noise and vibration sources. In recent years, the torsional vibration behaviour of engine and powertrain componentshas become increasingly important. This paper discusses various aspects of measuring and analysing torsional vibration and the associated data. Several torsional vibration measurement techniques are presented, along with precautions against possible sources of error and the expected accuracy of the measurement results. Two applications requiring multi-channel measurement and analysis are outlined.
Standard NVH analysis systems use airborne and structure-borne sound signals to analyse the generated noises, vibrations and their transmission paths.They often ignore the mechanism, how these effects are generated. Our case study addresses the questions of how noise excitation can be better analysed, where torsional vibrations can become critical as well as dynamic loads and which parameters should be recorded.