振幅上凸
指在某一指定位置处的振幅大于参考位置处振幅的一种状态，两处振幅均在同一表面上、沿同一方向测量。如果整个表面上各处的振幅都大于参考位置处的振幅，则称该整个表面（例如端面）存在振幅上凸。
只有一条槽的条形变幅杆，其端面上通常存在振幅上凸（对于轴向振幅而言，以端面中心处的振幅为参考测量）。
Amplitude rise
A condition in which the amplitude at a specified location is greater than the amplitude at a reference location, both amplitudes being measured on the same surface and in the same direction. An entire surface (e.g., the face) is said to have amplitude rise if the amplitude everywhere is greater than the amplitude at the reference location.
Bar horns with only one slot typically have amplitude rise on their faces (for the axial amplitude, measured with respect to the amplitude at the center of the face).
Also see —
Amplitude droop
Uniformity.