Removable Riveted Balance Ring for Turbine Disk Vibration
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Solution Overview
Problem
Conventional systems for balancing high pressure turbine disk stacks in gas turbine engines are inefficient and require improved methods to effectively reduce vibration.
Innovation Solution
A turbine disk balancing system that includes a flange with a circumferential groove, a split ring with axial holes, and balance weights riveted to the split ring, which are installed on fore and aft covers to interact with anti-rotation features, providing balanced rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional balancing systems are used for high pressure turbine disk stacks, then the structure is simple, but the vibration reduction effectiveness is insufficient
Solution Approach 1:
The balance weight is divided into two separate components: a split ring and a balance weight body. The split ring is attached to the cover flange while the balance weight is riveted to the split ring. This segmentation allows for modular assembly and adjustment of balancing weights, improving vibration reduction effectiveness while maintaining reasonable system complexity
Solution Approach 2:
The split ring serves as an intermediary component between the cover flange and the balance weight. It provides a mounting interface that connects the balance weight to the rotating assembly, enabling effective vibration reduction through proper weight distribution while managing the overall system complexity
2Adaptability or versatility
If balance weights are permanently attached to the cover, then the structural integrity is high, but the adaptability for different balancing requirements is reduced
Solution Approach 1:
The balancing system is designed to be dynamically adjustable rather than fixed. The split ring with multiple axial holes allows the balance weight to be positioned at different locations and securely attached using rivets. This dynamic configuration enables adaptation to different balancing requirements while managing assembly complexity through a standardized attachment mechanism
Solution Approach 2:
By separating the balance weight from the cover and introducing the split ring as an intermediate component, the system becomes adaptable. The balance weight can be removed, repositioned, or replaced by loosening and repositioning the rivet, providing versatility for different balancing scenarios without requiring complex permanent attachment systems
3Stability of the object's composition
If the split ring is securely attached to the flange, then the rotational stability is improved, but the assembly time increases
Solution Approach 1:
The attachment mechanism uses a simplified mechanical interference fit between the split ring's complementary profile and the flange's circumferential groove, combined with an anti-rotation tab and feature system. This replaces more complex mechanical fastening systems, achieving secure attachment and rotational stability while reducing assembly time through simpler installation procedures
Data Source
AI summary
The present disclosure includes a system for balancing a turbine disk stack, including a high pressure turbine disk stack. A flange is grooved to accommodate and orient a slip ring. Balancing weights are attached to the slip ring to balance the turbine disk stack during rotation of a gas turbine engine.