Turbomachine Blade Assembly Vibration Control

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Solution Overview

Problem

Current turbomachine blade arrangements face challenges in reducing undesired vibrations, particularly in compressor or turbine stages, where existing solutions rely heavily on frictional dissipation and lack effective detuning of natural frequencies.

Innovation Solution

A turbomachine blade arrangement featuring a tuning element guide housing with cavities for impact contact, secured by ribs on adjacent blades, which allows for detuning of natural frequencies through elastic and stochastic impacts, eliminating the need for additional locking plates and reducing manufacturing and assembly costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If tuning bodies are secured with locking plates, then reliability of the tuning body guide housing is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvereliability of tuning body guide housingVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The locking function is merged with the rib structure of the turbomachine blade. The ribs are formed integrally with the blade during manufacturing, eliminating the need for separate locking plates. This combines the structural support function with the locking function, reducing the number of components while maintaining reliability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The ribs serve multiple functions: they provide structural support to the blade, lock the tuning body guide housing in place, and guide the tuning bodies during operation. This multi-functionality eliminates the need for dedicated locking components, reducing device complexity while maintaining reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If locking plates are used to secure the tuning body guide housing, then reliability is improved, but manufacturing cost and assembly complexity increase

Engineering Contradiction:

Improvereliability of tuning body guide housingVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The blade ribs themselves provide the locking function without requiring additional components. The blade structure serves its own locking purpose, eliminating the need for separate locking plates and reducing manufacturing cost and assembly complexity.

Inventive Principle:

Principle #25Self-service

3Object-affected harmful factors

If frictional dissipation is used to reduce vibrations, then vibration reduction is achieved, but effectiveness in detuning natural frequencies is insufficient

Engineering Contradiction:

ImprovevibrationsVSAvoiddetuning of natural frequencies

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent uses mechanical vibration through impact contact between tuning bodies and the guide housing to detune natural frequencies. The tuning bodies are allowed to move and impact against the guide housing, creating controlled vibrations that effectively detune the system's natural frequencies, going beyond simple frictional dissipation.

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The patent changes the vibration reduction mechanism from passive frictional dissipation to active impact-based detuning. By allowing tuning bodies to move and impact, the system dynamically changes the vibrational parameters, effectively detuning natural frequencies and providing superior vibration control.

Inventive Principle:

Principle #35Parameter changes

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

This solution effectively reduces vibrations by detuning natural frequencies through impact-based mechanisms, enhancing the operating behavior of the turbomachine blades and improving vibration transmission, while also simplifying manufacturing and assembly processes.

Implementation Method 1

at least one tuning bodies are arranged with play for impact contact with the tuning body guide housing

Methodology Applied

Scientific EffectImpact contact: Impact Force

Implementation Method 2

a short-term or pulse-like, in particular at least essentially completely elastic, and/or stochastic or random contact

Methodology Applied

Scientific EffectElastic impact: Elasticity

Data Source

PatentEP3239461B1Turbo machine blade assembly

Publication Date: 2021.09.08 MTU AERO ENGINES GMBH

Figure 1
Figure 2~3
Figure 4~5

AI summary

16. The present invention relates to a turbomachine blade assembly comprising a first turbomachine blade (10), a second turbomachine blade (20) adjacent to it, and at least one reed guide housing (30) with at least one cavity in which at least one reed (5) is arranged with clearance for impact contact with the reed guide housing, wherein the reed guide housing is arranged at least partially in a recess (11), in particular in a frame (12), of the first turbomachine blade (10), characterized in that the second turbomachine blade (20) has at least one first rib (21) for securing the reed guide housing (30) arranged in the recess (11).