Research on the Alignment Method for Multi-Segment Long Shaft Systems

Abstract

Aiming at the problems of frequent measurement, difficult adjustment and error accumulation in conventional alignment of a ship's multi-segment long shaft system due to many moving parts and dense nodes, this paper proposes an integrated scheme of "tooling constraint-stepwise alignment-laser detection-overall re-inspection" by analyzing technical principles, designing special tooling and optimizing process flow, combined with the onshore experiment scenario. The scheme restricts the movement allowance of self-aligning roller bearings and drum gear couplings through positioning tooling, and achieves high-precision measurement with a laser aligner. Finally, the radial deviation of the shaft system is controlled within ≤0.2mm and the axial deflection within ≤0.25mm/m. Moreover, the shaft system shows excellent precision stability after 4 hours of no-load operation, providing engineering reference for the alignment of similar shaft systems.