Vibration-Damping Structure for Turbomachine Blade Crack Prevention
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Solution Overview
Problem
Rotating turbomachine components like rotor blades and guide vanes experience vibrations due to rotational accelerations, leading to crack formation and reduced lifespan, necessitating frequent maintenance and replacement.
Innovation Solution
A vibration-damping structure combination is created by coating a first structure with a filler that forms a cavity, which is then filled with a curable material and cured, allowing the further structure to move relative to the first structure within an abutment surface, thereby damping vibrations through compensating movements or abutment, thus preventing crack formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotor blades and guide vanes are operated continuously in turbomachines, then productivity is improved, but vibrations cause crack formation reducing reliability
Solution Approach 1:
The patent applies beforehand cushioning by introducing a vibration-damping structure combination that includes a filler material positioned between the movable structure ( rotor blade or guide vane) and the abutment surface. This filler material acts as a cushioning element that absorbs and dampens vibrations before they can cause crack formation, thereby maintaining reliability during continuous operation
Solution Approach 2:
The patent employs composite materials by combining different materials with complementary properties: a metallic or ceramic structure providing mechanical strength, and a vibration-damping filler material (such as polymer, rubber, or viscoelastic material) that absorbs vibrations. This composite structure resolves the contradiction by integrating both structural integrity and vibration damping capabilities
2Reliability
If rotor blades and guide vanes are replaced after predetermined operating time, then reliability is maintained, but loss of time occurs due to maintenance interruptions
Solution Approach 1:
The vibration-damping structure combination is installed beforehand on the rotor blades and guide vanes during initial assembly. This preventive measure dampens vibrations throughout the component's service life, preventing crack formation and extending operational lifetime, thereby reducing the frequency of maintenance interventions and associated downtime
Solution Approach 2:
The vibration-damping structure combination provides self-service by continuously dampening vibrations during operation without requiring external intervention. The filler material automatically absorbs and dissipates vibrational energy, allowing the component to protect itself against fatigue damage throughout its operational life
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The vibration-damping structure combination effectively increases the lifespan of turbomachine components by reducing vibrations and preventing crack formation, addressing the root cause of damage rather than just its symptoms.
Implementation Method 1
filling the cavity with a filler; curing the filler until the further structure having a further structure surface is formed
Implementation Method 2
the further structure being movable within an abutment surface defined by a first structure surface of the first structure; vibrations can be damped by means of a compensating movement and/or by means of abutment of the further structure surface of the further structure on the abutment surface of the first structure
Data Source
AI summary
A method for producing a vibration-damping structure combination for damping vibrations for movable masses, having a first structure and a further structure, the further structure movable within a stop surface defined by a first structure surface of the first structure. The method includes a) providing the first structure, having the first structure surface and which defines a coating surface of a coating at least in some sections; b) coating the first structure surface of the first structure with the coating, the coating surface of the coating being applied such that a cavity is formed; c) filling the cavity with the filler; d) curing the filler until the further structure having a further structure surface is formed, which lies against the coating surface; and e) removing the coating, the further structure thus being movable relative to the first structure within the stop surface defined by the first structure surface.