Turboprop Engine Carcass Stiffener for Maneuver Load Deflection
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Solution Overview
Problem
High maneuver loads cause significant deflection in the exhaust engine carcass of turboprop engines, necessitating improved structural reinforcement to minimize deflection and ensure engine stability.
Innovation Solution
The engine carcass stiffener system, comprising proximal and distal flanges, longitudinal reinforcement members, bushing holders, bolts, and sliding pins, is designed to structurally reinforce the exhaust engine carcass by distributing load and allowing for axial expansion without excessive deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the exhaust engine carcass is structurally reinforced to minimize deflection under high maneuver loads, then the structural integrity and stability are improved, but the device complexity and weight increase
Solution Approach 1:
The stiffener system is divided into multiple modular components including proximal and distal flanges, longitudinal reinforcement members, cross-support members, bushing holders, and sliding pins. This segmentation allows each component to perform its specific function while simplifying manufacturing, assembly, and maintenance of the overall structure.
Solution Approach 2:
The stiffener system incorporates three-dimensional spatial arrangement with longitudinal members extending along the exhaust carcass, cross-support members providing radial bracing, and sliding pins enabling axial movement. This multi-dimensional structure efficiently distributes maneuver loads throughout the exhaust system while minimizing deflection.
2Stability of the object's composition
If longitudinal reinforcement members are added to the exhaust engine carcass, then deflection under maneuver loads is reduced, but the weight of the engine increases
Solution Approach 1:
Reinforcement is concentrated in specific high-stress areas where maneuver loads are most severe, such as the exhaust carcass region. The stiffener system uses localized flanges and reinforcement members only where needed, rather than uniformly strengthening the entire engine structure, thereby minimizing weight increase while achieving adequate deflection resistance.
Solution Approach 2:
The stiffener system employs composite construction combining different materials and structural forms - flanges for mounting, longitudinal members for primary reinforcement, cross-support members for lateral bracing, and sliding pins for controlled movement. This composite approach optimizes strength-to-weight ratio by using each material and component form where it provides the most benefit.
3Adaptability or versatility
If the stiffener system allows axial expansion through sliding pins, then thermal expansion is accommodated, but the structural rigidity is reduced
Solution Approach 1:
The sliding pin mechanism transforms the stiffener system from a completely rigid structure to a dynamically adaptive one. The sliding pins allow controlled axial movement to accommodate thermal expansion and contraction of the exhaust carcass during operation, while the longitudinal and cross-support members maintain structural rigidity against lateral maneuver loads. This dynamic capability enables the system to adapt to both thermal and mechanical loading conditions.
Solution Approach 2:
The sliding pins act as intermediary elements between the stiffener system and the exhaust carcass, mediating the thermal expansion forces. These pins allow relative axial movement while maintaining structural connection, effectively decoupling the thermal expansion behavior from the structural reinforcement function. This intermediary mechanism protects the rigid stiffener structure from thermal stresses while maintaining its load-bearing capability.
Data Source
AI summary
An engine carcass stiffener for a turboprop engine is provided. The engine carcass stiffener includes a first longitudinal reinforcement member, a proximal end of the first longitudinal reinforcement member is coupled to a first end of a proximal flange; a second longitudinal reinforcement member, a proximal end of the second longitudinal reinforcement member is coupled to a second end of the proximal flange; a first bushing holder, the first bushing holder is coupled to a first end of a distal flange; a second bushing holder, the second bushing holder is coupled to a second end of the distal flange; a first bolt, the first bolt is inserted through the first bushing holder and couples to a distal end of the first longitudinal reinforcement member; and a second bolt, the second bolt is inserted through the second bushing holder and couples to a distal end of the second longitudinal reinforcement member.