Jet Engine Rotor Wheel Segmented Damping Design

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Solution Overview

Problem

Turbojet engine moving wheels with one-piece bladed discs or rings face high vibration levels due to lack of energy dissipation by friction, leading to manufacturing challenges and potential imbalance issues with existing damping solutions.

Innovation Solution

A moving wheel design featuring an intermediate piece with segmented damping means comprising layers of viscoelastic and rigid materials, fixed alternately, which are arranged on the inner or outer faces of the intermediate piece to cover partially or fully, providing effective vibration damping without disturbing the gas flow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If damping means are added to one-piece bladed discs or rings, then vibration levels are reduced, but manufacturing complexity and imbalance risks increase

Engineering Contradiction:

Improvevibration dampingVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The damping means is segmented into multiple elementary damping means arranged in the axial direction. Each elementary damping means can be manufactured and positioned independently, simplifying the overall manufacturing process while maintaining effective vibration damping across the blade structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

An intermediate piece is introduced between the blade support and the damping means. This intermediary component provides a dedicated mounting surface for the damping means, separating the damping function from the blade structure itself and simplifying both manufacturing and assembly processes.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of energy

If damping means are mounted on blade profiles, then energy dissipation improves, but machining difficulties and imbalance risks arise

Engineering Contradiction:

Improveenergy dissipationVSAvoidmachining ease

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The intermediate piece serves as a mediator that provides a dedicated mounting surface for the damping means, eliminating the need to machine the blade profile directly. This separates the damping function from the blade structure, making manufacturing easier while maintaining effective energy dissipation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The damping means is divided into elementary segments that can be manufactured separately and assembled on the intermediate piece, avoiding complex machining operations on the blade profiles themselves while still achieving effective energy dissipation.

Inventive Principle:

Principle #1Segmentation

3Reliability

If damping means cover the entire blade profile, then vibration damping is maximized, but gas flow disturbance increases

Engineering Contradiction:

Improvevibration dampingVSAvoidgas flow disturbance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The damping means is applied locally on the intermediate piece rather than covering the entire blade profile. This localized application provides effective vibration damping at the root where vibrations are most severe, while leaving the blade profiles exposed to gas flow undisturbed.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The intermediate piece acts as a mediator that provides a mounting surface for the damping means away from the gas flow path. This allows the damping means to be positioned on the intermediate piece rather than on the blade profiles themselves, eliminating gas flow disturbance while maintaining vibration damping effectiveness.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 effectively dissipates vibrational energy through shear stresses in the viscoelastic layers, reducing blade vibrations and preventing energy transmission between blades, while avoiding manufacturing complexities and imbalance risks.

Implementation Method 1

The solution effectively dissipates vibrational energy through shear stresses in the viscoelastic layers

Methodology Applied

Scientific EffectViscoelasticity: Viscoelasticity

Implementation Method 2

The solution effectively dissipates vibrational energy through shear stresses in the viscoelastic layers

Methodology Applied

Scientific EffectShear stress: Shear Stress

Implementation Method 3

at least one damping means arranged on at least one face of said intermediate piece. The damping means is segmented along an axial direction into at least two elementary damping means

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentEP2009238B1Rotor wheel for a jet engine, and jet engine comprising same

Publication Date: 2012.10.31 SN DETUDE & DE CONSTR DE MOTEURS DAVIATION (S N E C M A)

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Figure 4~14

AI summary

The wheel (10, 110) comprises a blade (12) and a support (22) for said blade (12), which extend substantially radially. It further comprises at least one intermediate piece (26) extending, in a substantially axial direction, between said blade (12) and said support (22) of the blade, and at least one damping means (30) disposed on at least one face (262, 264) of said intermediate piece (26) and comprising at least one layer (32) of viscoelastic material and at least one counter-layer (34) of rigid material. The damping means is segmented along an axial and/or circumferential direction into at least two elementary damping means (36).