Resonant Damper Insert for Turbine Opening Vibration Control
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Solution Overview
Problem
Turbine components such as blades and nozzles experience vibrational stress during operation, which can lead to undesirable vibrations affecting gas turbine performance and component life, and existing damper elements may lock together or fail to dampen vibrations effectively due to centrifugal forces.
Innovation Solution
A vibration dampening system with resonant-tuned elongated bodies extending through damper elements in body openings of turbine components, generating forces against the damper elements to resonate at predefined frequencies, using various geometric and material characteristics to match the turbine's resonant frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional damper elements are used in turbine components, then vibration dampening is achieved, but centrifugal forces cause locking of damper elements and prevent them from vibrating at desired frequencies
Solution Approach 1:
The patent employs a resonant-tuned elongated body that is mechanically coupled to damper elements and configured to vibrate at a predetermined resonant frequency. This mechanical vibration approach allows the system to counteract harmful vibrations through constructive interference, where the resonant body vibrates in opposition to the harmful vibrations, thereby maintaining damper element freedom of movement while achieving effective vibration dampening.
Solution Approach 2:
The resonant-tuned elongated body serves as an intermediary element between the damper elements and the harmful vibrations. This intermediary body is mechanically coupled to the damper elements and provides a mediating vibration response that prevents direct locking between damper elements while maintaining their vibration freedom. The intermediary body absorbs and redistributes vibrational energy, preventing centrifugal force-induced locking.
2Reliability
If resonant-tuned elongated bodies are added to dampen vibrations, then vibration dampening effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent merges the resonant-tuned elongated body with the existing damper element structure through mechanical coupling. This combining approach integrates the vibration dampening function into the existing component configuration rather than adding a completely separate system. The resonant body is coupled to the damper elements in a way that leverages their existing structural relationship, thereby improving vibration dampening while minimizing additional complexity.
Solution Approach 2:
The resonant-tuned elongated body is designed with specific parameters (length, cross-sectional dimensions, material properties) that are optimized to provide the desired resonant frequency. By carefully selecting and adjusting these parameters, the system achieves effective vibration dampening at target frequencies without requiring overly complex structural configurations. The parameter optimization allows for simple geometric forms that are easy to manufacture while maintaining high dampening effectiveness.
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 system effectively reduces turbine component vibrations without adding significant mass or changing the component configuration, improving dampening performance and reducing centrifugal forces.
Implementation Method 1
a first resonant-tuned elongated body extending through an opening in the one or more damper elements in the first body opening, wherein the first resonant-tuned elongated body is configured to resonate at a first predefined resonant frequency, whereby the first resonant-tuned elongated body generates a force against the one or more damper elements in the first body opening
Data Source
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AI summary
A vibration dampening system (120) includes damper element(s) (174) in a body opening (160) of a turbine component (111). A resonant-tuned elongated body (190) extends through the damper element(s) (174) in the body opening (160). The elongated body (190) is configured to resonate at a predefined resonant frequency, such as the same resonant frequency as turbine component (111) at the body opening (160), to generate a force against the damper element(s) (174) in the body opening (160). The damper element(s) (174) have a surface (194) in contact with the body opening (160) and/or elongated body (190).