Multipoint electromagnetic excitation for experimental investigation of rotating bladed wheel dynamics

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F21%3A00546975" target="_blank" >RIV/61388998:_____/21:00546975 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.icsv27.org/" target="_blank" >https://www.icsv27.org/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Multipoint electromagnetic excitation for experimental investigation of rotating bladed wheel dynamics

Popis výsledku v původním jazyce

Modern turbine bladed wheels are designed for higher operating temperatures and flow rates. How-ever, the trend of producing ever-longer and ever-thinner blades leads to lower dynamic stiffness. Therefore, dynamic stiffness and structural damping must be increased by additional structural ele-ments, e.g. tie-bosses, shroud connections. Such a complex mechanical structures with dry friction contacts require very precise experimental investigation under rotation. However, verification of their dynamics needs also sufficient force capacity of contactless excitation to exceed the adhesion forces in contacts. Therefore we have dealt with a development of multipoint electromagnetic exci-tation systems in our rotary laboratory. We use two strategies of excitation. The strategy A is based on the affinity of excitation forces to the travelling waves when analytical solution serves for design of the optimal space distribution and time dependences of the multipoint electromagnetic excitation. As to the placement of electromagnets and phase shift of the excitation harmonic signals, it is de-pendent on number of nodal diameters. At the strategy B, the electromagnetic pulses are synchro-nized with wheel revolutions and with dynamic responses of selected blades measured by the strain-gauge system. It requires accurate synchronization of the electromagnets with wheel revolutions and with a dynamic response of the selected blade.

Název v anglickém jazyce

Multipoint electromagnetic excitation for experimental investigation of rotating bladed wheel dynamics

Popis výsledku anglicky

Modern turbine bladed wheels are designed for higher operating temperatures and flow rates. How-ever, the trend of producing ever-longer and ever-thinner blades leads to lower dynamic stiffness. Therefore, dynamic stiffness and structural damping must be increased by additional structural ele-ments, e.g. tie-bosses, shroud connections. Such a complex mechanical structures with dry friction contacts require very precise experimental investigation under rotation. However, verification of their dynamics needs also sufficient force capacity of contactless excitation to exceed the adhesion forces in contacts. Therefore we have dealt with a development of multipoint electromagnetic exci-tation systems in our rotary laboratory. We use two strategies of excitation. The strategy A is based on the affinity of excitation forces to the travelling waves when analytical solution serves for design of the optimal space distribution and time dependences of the multipoint electromagnetic excitation. As to the placement of electromagnets and phase shift of the excitation harmonic signals, it is de-pendent on number of nodal diameters. At the strategy B, the electromagnetic pulses are synchro-nized with wheel revolutions and with dynamic responses of selected blades measured by the strain-gauge system. It requires accurate synchronization of the electromagnets with wheel revolutions and with a dynamic response of the selected blade.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20302 - Applied mechanics

Projekt

<a href="/cs/project/GA20-26779S" target="_blank" >GA20-26779S: Výzkum nestabilit dynamického stall flutteru a jejich následků na aplikace turbostrojů pomocí matematických, numerických a experimentálních metod</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

27th International Congress on Sound and Vibration: ICSV27

ISBN

978-83-7880-799-5

ISSN

2329-3675

e-ISSN

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Počet stran výsledku

8

Strana od-do

176

Název nakladatele

Silesian University Press

Místo vydání

Gliwice, Poland

Místo konání akce

Virtual, Online

Datum konání akce

11. 7. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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