An increasing number of flow-induced vibrations at hydraulic structures can be observed in the last years. They occur at old gates, such as roller or lifting gates, but also at new gates, such as radial gates or filling valves at mitre gates. Against this background a research and development project was initiated in the Bundesanstalt fürWasserbau, in order to analyze the different causes by measurements on site and by the use of numerical models. The aim is to identify the excitation mechanisms and to improve the currents construction standards. Operational measures are another option in order to avoid critical opening widths. In general, it is difficult for operators to identify the actual oscillator. Therefore, it is useful to provide a range of frequencies which are typical for a gate or gate parts such as springs or rubber sealings. Intensive investigations were carried out with different measurement systems but also by the use of cameras to sample audiosignals for a frequency analysis. In this paper, the aims, methods and first results of the R&D-project will be presented.