Modular Impulse Body Housing for Gas Turbine Blade Vibration Damping

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Solution Overview

Problem

Egg-carton-like impulse detuning components for gas turbine blades are costly and large, requiring specific production methods for each configuration, which limits their efficiency and versatility in reducing vibrations.

Innovation Solution

A modular impulse body system with a one-piece housing containing a single or additional cavity, closed airtightly, accommodating spherical or cylindrical impulse bodies with controlled movement, allowing for cost-effective production and assembly into various configurations to reduce vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If egg-carton-like impulse detuning components with multiple cavities are used, then vibration reduction capability is improved, but production cost increases and device complexity increases

Engineering Contradiction:

Improvevibration reduction capabilityVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The impulse detuning component is divided into multiple independent cavity units, each containing an impulse body. These modular cavities can be independently manufactured and then assembled, simplifying production while maintaining the vibration reduction effectiveness of having multiple impulse bodies.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple cavity units are combined into a single integrated housing structure that is produced as one piece. This merging of multiple functional units into a unified structure reduces overall device complexity while preserving the individual functionality of each cavity-impulse body pair for vibration reduction.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If egg-carton-like impulse detuning components with multiple cavities are used, then vibration reduction capability is improved, but production cost increases

Engineering Contradiction:

Improvevibration reduction capabilityVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The component is segmented into standardized cavity modules that can be produced using identical or similar manufacturing processes. This segmentation allows for economies of scale and standardized production techniques, reducing the cost impact of having multiple cavities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The housing structure is designed to accommodate multiple impulse bodies simultaneously, making it a multi-functional component that provides vibration reduction across different modes and directions. This universal design approach consolidates what would otherwise require multiple separate components, reducing production costs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If impulse bodies are accommodated with play of movement in multiple directions, then vibration reduction effectiveness is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvevibration reduction effectivenessVSAvoidangular alignment precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

Each cavity is designed with specific geometric characteristics that guide the impulse body's movement in predetermined directions. The local geometry of each cavity provides the necessary constraints and guidance, ensuring proper angular alignment without requiring high-precision manufacturing across the entire component.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The housing structure incorporates predetermined clearance and positioning features that pre-establish the appropriate play of movement for impulse bodies. These built-in geometric features compensate for manufacturing tolerances and ensure consistent angular alignment without requiring extremely tight manufacturing precision.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 modular design reduces production costs, enhances impact contact characteristics, and allows for flexible assembly into different configurations to effectively manage vibrations in gas turbine blades, improving both production efficiency and performance.

Implementation Method 1

impact contacts between the impulse bodies and the cavities

Methodology Applied

Scientific EffectImpact contact: Impact Force

Implementation Method 2

reduce vibrations of gas turbine blades

Methodology Applied

Scientific EffectVibration reduction: Damping

Data Source

PatentUS11306596B2Gas turbine blade impulse body module

Publication Date: 2022.04.19 MTU AERO ENGINES GMBH

AI summary

The present invention relates to an impulse body module group with at least two impulse body modules, which, in particular, are identical in construction, for a gas turbine blade, wherein each of the impulse body modules comprises a housing, which, in particular, is of one piece and which has a first cavity, which is closed, in particular in an airtight manner, by a first cover, which is joined to the housing, in particular in a material-bonded manner, and in which a single, in particular spherical or cylindrical, first impulse body is accommodated with play of movement in at least one first direction of impact, wherein the housing has no additional cavity or a single additional cavity, in which a single, in particular spherical or cylindrical, additional impulse body is accommodated with play of movement in at least one direction of impact.