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Since they correspond to a jump from a given note to another one, the mouthpressure thresholds leading to regime changes are particularly importantquantities in flute-like instruments. In this paper, a comparison of suchthresholds between an artificial mouth, an experienced flutist and a non playeris provided. It highlights the ability of the experienced player toconsiderabily shift regime change thresholds, and thus to enlarge its controlin terms of nuances and spectrum. Based on recent works on other windinstruments and on the theory of dynamic bifurcations, the hypothe- sis istested experimentally and numerically that the dynamics of the blowing pressureinfluences regime change thresholds. The results highlight the strong influenceof this parameter on thresholds, suggesting its wide use by experiencedmusicians. Starting from these observations and from an analysis of a physicalmodel of flute-like instruments, involving numerical continuation methods andFloquet stability analysis, a phenomenological modelling of regime change isproposed and validated. It allows to predict the regime change thresholds inthe dynamic case, in which time variations of the blowing pressure are takeninto account.

Regime change thresholds in flute-like instruments: influence of the mouth pressure dynamics