Search Results

Operational Transfer Path Analysis (OTPA) assess the possible ways of energy to transfer from the various sources of excitation to a given target location. Applied to vehicle engineering, the OTPA provides indication about dominant sources and path contributions. However, it can only analyze the actual system under test and cannot predict if an improvement can be achieved by applying a counter measure. A careful interpretation of the measurement results is therefore necessary in order to define an effective engineering solution strategy. In this paper the RMA (Response Modification Analysis) technique is used to facilitate a sensitivity analysis, gaining insight whether energy is likely to be rerouted. This gives additional understanding of OTPA results, indicating which counter measure is most effective. The RMA is applied to a real measurement scenario, showing the advantage of the combination of OTPA with RMA for correctly identifying the relevant sources and paths.

The concept of identifying, characterizing and assessing sound transfer paths from sources to receiving points by applying transfer path analysis (TPA) has been keeping continuous interest since its introduction some 25 years ago. The attractive prospects of TPA-based clues to aimed modifications at particular sound sources and/or sound transmission paths have been confirmed by many successful applications of the approach. Nevertheless, the method still lacks full, undisputed acknowledgement and approval as a widespread tool of sound contribution analysis. Apart from unrealistic early expectations this may be due to considerable measuring efforts to sufficiently describe all relevant sources. For this reason, the instrumental realization of the approach has been subject to continuous modifications to tighten up the procedure and to reduce its measuring and evaluating efforts.