Abstract: A composite part is manufactured by an additive process, which includes locating a layer of fibers, selectively depositing a matrix material in a predetermined pattern onto portions of the layer of fibers to form a matrix material layer, repeating these steps to generate a preform of the composite part, and applying heat and pressure to the preform to consolidate the layers of fiber and the layers of matrix material. During the depositing of the matrix material, voids are created within at least one layer of the matrix material by intentionally not depositing matrix material over predetermined areas of the layer of fibers, the predetermined areas configured to be within an outer boundary of the predetermined pattern of the matrix material.

Abstract: A propeller shaft assembly having a propeller shaft member defining an inner volume. A foam liner member is disposed in at least a portion of the inner volume of the propeller shaft member. The foam liner member is made of a viscoelastic, natural oil polyol-based foam, whereby the foam liner member is operable to reduce vibration amplitudes occurring within the propeller shaft member relative to an undampened propeller shaft member.

Abstract: A propeller shaft assembly having a propeller shaft member defining an inner volume. A foam liner member is disposed in at least a portion of the inner volume of the propeller shaft member. The foam liner member is made of a viscoelastic, natural oil polyol-based foam, whereby the foam liner member is operable to reduce vibration amplitudes occurring within the propeller shaft member relative to an undampened propeller shaft member.

Abstract: A method and system are provided for measurement of vibration of an object utilizing a non-contact imaging sensor such as a video camera. An object which does not already have a pair of spaced-apart marks is marked with two parallel lines spaced apart from one another a known, nominal distance. The two lines are perpendicular to an imaging axis of the camera. As such, when the object with the parallel lines is moved toward or away from the video camera, the lines on the object appear to move as two parallel lines in the image plane of the camera. As the object moves or vibrates along the imaging axis, the nominal image plane distance between the two lines changes. This apparent change in the distance between the parallel lines in the image plane is calibrated to the physical movement of the object in space due to deformation or rigid body motions.

Abstract: A method and system are provided for measurement of vibration of an object utilizing a non-contact imaging sensor such as a video camera. An object which does not already have a pair of spaced-apart marks is marked with two parallel lines spaced apart from one another a known, nominal distance. The two lines are perpendicular to an imaging axis of the camera. As such, when the object with the parallel lines is moved toward or away from the video camera, the lines on the object appear to move as two parallel lines in the image plane of the camera. As the object moves or vibrates along the imaging axis, the nominal image plane distance between the two lines changes. This apparent change in the distance between the parallel lines in the image plane is calibrated to the physical movement of the object in space due to deformation or rigid body motions.