Abstract
An assembly includes first vanes, second vanes, a rotor and an actuation system. The actuation system includes a first ring and a second ring. The first ring is coupled to each first vane. The second ring is coupled to each second vane. During a first mode, the actuation system is configured to rotate the first ring in a first rotational direction about the axis, rotate the second ring in a second rotational direction about the axis, and pivot each of the first vanes and each of the second vanes in a common first pivot direction. During a second mode, the actuation system is configured to rotate the first ring in the second rotational direction about the axis, rotate the second ring in the first rotational direction about the axis, and pivot each of the first vanes and each of the second vanes in a common second pivot direction.