Damper Ring Vibration Dissipation for Blisk Reliability
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Solution Overview
Problem
Existing damper systems for blisks in turbomachines are inadequate in reducing vibrations, impacting performance and service life due to insufficient damping properties.
Innovation Solution
A damper ring with radially arranged damper elements that dissipate vibration energy and transfer oscillation modes into less critical shrinkage modes, designed to resonate with the blisk's natural frequency, utilizing a structure with an outer and inner ring connected by web elements and featuring pre-assembled damper elements for effective vibration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional damper systems are used in blisks, then the structure is simple and easy to manufacture, but the vibration reduction performance is insufficient
Solution Approach 1:
The damper ring is segmented into multiple dampers distributed around the circumference, with each damper consisting of a mass element and a spring element. This segmentation allows the system to effectively damp multiple vibration modes simultaneously while maintaining a modular structure that is relatively simple to manufacture and install.
Solution Approach 2:
The dampers are nested within the blade passage space of the blisk, with the damper ring positioned radially inward of the blade ring. This nesting approach utilizes the existing space within the blisk structure, avoiding additional external components and minimizing impact on the overall device complexity.
2Reliability
If damper elements are added to reduce vibrations, then vibration energy is dissipated effectively, but the device complexity increases
Solution Approach 1:
The damper mass elements are merged with the damper ring structure, forming an integrated component rather than separate loose parts. The spring elements are positioned within the radial gap between the damper ring and blade ring, combining multiple functions (damping, structural support, and space utilization) into a unified design that reduces the overall number of discrete components.
Solution Approach 2:
The damper ring structure serves multiple functions: it provides the mounting structure for the dampers, acts as a structural component of the blisk, and utilizes the radial space within the blade passages. This multi-functionality reduces the need for additional dedicated damping components, thereby limiting the increase in device complexity.
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 solution significantly enhances vibration reduction, improving the blisk's performance and service life by effectively dissipating and transferring vibration energy into less critical modes, thereby reducing oscillation loads.
Implementation Method 1
at least one damper element configured to dissipate vibration energy of the blisk
Implementation Method 2
dissipate vibration energy of the blisk and/or to transfer vibration modes of the blisk into vibration modes that differ from the vibration modes of the blisk
Implementation Method 3
In one embodiment, a natural frequency of the damper element essentially corresponds to a natural frequency of the blisk
Data Source
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AI summary
The invention relates to a damper ring (1) for reducing unwanted vibrations of a blisk (2), which can be arranged radially on the inside of a blade ring (3) of the blisk (2). The damper ring (1) is characterized by at least one damper element (4) which is configured to dissipate vibrational energy of the blisk (2) and/or to transfer vibration modes of the blisk into vibration modes that differ from the vibration modes of the blisk. The invention further relates to a blisk (2) and a turbomachine (13).