词汇 | subharmonic |
释义 | BETA Examples of subharmonicsubharmonic isn’t in the Cambridge Dictionary yet. You can help! Furthermore, synchronisation to a subharmonic of the driving frequency of the periodic input is found. Fourthly, quasiperiodicity or subharmonic bifurcation generally precedes non-periodic motion in these experiments. Unlike the subharmonic case, a steady streaming component is present in the second-order perturbations. It happens that at the subharmonic point, r does take on its smallest value. When the probe was moved downstream, the first subharmonic emerged from the noise. Most interestingly, both calculations converge towards the same growth rate for the subharmonic. In this note these calculations are used to determine the frequency of the fastest-growing subharmonic instabilities precisely. It is seen that the most unstable modes are subharmonic modes, either two-dimensional or three-dimensional. Section 4 is devoted to a linear stability analysis; and particularly to the cases of subharmonic and synchronous responses of the perturbations. For the shear layer mode pairing, on the other hand, tripping removes the subharmonic peak(s) from the spectrum completely. We consider the subharmonic case and the synchronous case separately. The maximum level of the subharmonic occurred a t about twice the distance downstream from the region where the fundamental saturated. This phenomenon is also known as subharmonic resonance or frequency division. We observe the following sequence of instabilities leading to turbulence via subharmonic bifurcations. The interaction of this mode with itself and its higher harmonics is identical to that described above in detail for the subharmonic case. The observed subharmonic structure also indicates that the disturbance along one ripple is not localized, but interacts with those along adjacent ripples. These observations clearly show that the two-dimensional flow over ripples can be unstable to three-dimensional disturbances, and suggest that the unstable mode can be subharmonic. Superharmonic perturbations are associated with integer values of p ; otherwise the perturbations are subharmonic. |
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