Acoustic flexural mode on a ridge of semi-infinite height

Several recent analyses of the flexural mode on a ridge of semi-infinite height (plate edge) contain results which are inconsistent and generally limited in range. We present accurate theoretical calculations, and a set of measurements which agree very well with them, and we compare our results with the earlier ones. We also give a simple model which yields other wave properties (such as the vertical decay rate), indicate and verify quantitatively the wave behaviour at high frequencies, and show the relation between this wave type and the usual flexural mode on a ridge of finite height.