Open transfer path measurement round-robin using a simplified measurement object P. Dietrich 1 , B. Masiero 1 M. Lievens 1 M. Vorl¨ ander 1 S. Bistafa 2 S.N.Y. Gerges 3 1 RWTH Aachen University, Insitute of Technical Acoustics, (ITA) Neustrasse 50, 52066, Aachen, Germany e-mail: pdi@akustik.rwth-aachen.de 2 Escola Polit´ ecnica, USP, S˜ ao Paulo, Brazil 3 Federal University of Santa Catarina (UFSC), LVA, Florian´ opolis, Brazil Abstract The prediction and auralization of sound emitted by household appliances and the propagation inside the scenario they are mounted in is a useful tool during the engineering and design process. As the prediction relies on measured data the uncertainty of the input data has to be investigated to characterize the quality of the prediction. In order to investigate these uncertainties in transfer path analysis and synthesis – involving measurements as well as numerical simulations – a simplified small measurement object was developed by ITA within the last year. The rectangular shaped box is made of MDF with the dimensions 300 mm by 500 mm by 800 mm and can hold ceilings of different materials. In this open project different scenarios of sound transmission to be measured are defined and will be available on the institute’s website. This paper concentrates on first round robin results of airborne transfer paths obtained by three different laboratories for three independently built boxes. The obtained data is analyzed regarding manufacturing, actuator and sensor calibration, equipment and chosen measurement setup. More participants are expected to join the project in order to compare measurement techniques along with auralization and simulation models. The psychoacoustic relevance of the uncertainties found along with different source signals will be studied in the following project phase. 1 Introduction When dealing with Transfer Path Analysis and Synthesis (TPA/TPS) measurement data and numerical mod- els are used to either estimate the sound pressure level for a given scenario or to auralize this situation. How well synthesis and reality coincide heavily depends on the quality of the model and measurements used. As can be seen in Fig. 1, measuring the exact same transfer path using different measurement techniques and different measurement equipment by the same researcher arrives at considerably distinct results. Depend- ing on the particular in-situ excitation signals different uncertainty ranges have to be expected, e.g. in the predicted sound pressure level. Broadband signals without strong tonal components are assumed to behave simpler for the prediction of in-situ forces or sound pressure than, e.g., sinusoidal multi-tone signals. For the latter ones the prediction strongly depends on how well a resonance matches a tonal component in the excitation. In order to investigate errors or uncertainties in the measurement or the modeling of the acoustic scenario, a simplified scenario has been designed by LIEVENS ET. AL. [1]. It concentrates on the applicability of 1D models for the source, compared with an exact 3D model which also includes moments. As structure-borne 3899