| 摘要 |
A pair of concentrically arranged members defining an annular duct therebetween including a throat section of minimum cross-sectional area are rigidly interconnected and universally mounted for omnidirectional rotation as a unit within an outer annular housing having an inner spherical seat. Two mutually independent rotational actuating systems, each employing a diametrically opposed pair of fluid cavity actuators built into the outer duct-forming member and pivotally mounted on the outer housing, provide simultaneous rotational control about two mutually orthogonal diametrical axes passing through the spherical center of rotation of the members and the pivot axes of the two actuator pairs. The upstanding walls of each actuator cavity are defined by a floating sealing member. Throat area adjustability is provided by an independently controlled annular throat adjusting segment which is constrained to translational motion along the duct axis relative to the inner member and has an axially skewed throat defining surface. Control over the position of the throat adjusting segment is via a toroidal bladder having a rectangular cross-section.
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