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description Publicationkeyboard_double_arrow_right Article , Journal 2018 United Kingdom, United Kingdom, ItalyPublisher:Springer Science and Business Media LLC Authors:Fantetti A.;
Fantetti A.
Fantetti A. in OpenAIREGastaldi C.;
Gastaldi C.
Gastaldi C. in OpenAIREBerruti T. M.;
Berruti T. M.
Berruti T. M. in OpenAIREhandle: 11583/2706163 , 10044/1/63384
This paper deals with the dynamic of blades with strip dampers. The purpose is 1) to present the results of the dynamic numerical calculation, 2) to demonstrate the need for the experimental data on the blade-strip contact to be used as input to the calculation, 3) to propose a new test rig design to obtain them and 4) to test the key components of the new test rig. The forced responses of two blades coupled by a strip damper are calculated at different excitation and centrifugal force values. The dependence of the numerical results on the contact parameter values is confirmed in this significant reference case. The design of a new test rig is then proposed: both the blade frequency response function and the contact hysteresis cycles at the blade-strip contact are measured. It is shown how contact parameters can then be derived from experimental data. The main novelty of the test rig here proposed is the strip loading system, which simulates the uniform pressure distribution provided by the centrifugal force in real operating conditions. This loading system is non-contact and uses compressed air. Classical loading systems which see dead weights directly connected to the strip are assessed and their expected inadequacy is confirmed. The compressed air system is tested by measuring the pressure produced between strip and blades: pressure is uniform across the contact patch, constant in time and its mean value corresponds to realistic pressure values actually experienced by strip dampers during service.
Publications Open Re... arrow_drop_down Publications Open Repository TOrinoArticle . 2018License: CC BYData sources: Publications Open Repository TOrinoImperial College London: SpiralArticle . 2018License: CC BYFull-Text: http://hdl.handle.net/10044/1/63384Data sources: Bielefeld Academic Search Engine (BASE)Spiral - Imperial College Digital RepositoryArticle . 2018Data sources: Spiral - Imperial College Digital Repositoryadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1007/s40799-018-0248-z&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen hybrid 15 citations 15 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
more_vert Publications Open Re... arrow_drop_down Publications Open Repository TOrinoArticle . 2018License: CC BYData sources: Publications Open Repository TOrinoImperial College London: SpiralArticle . 2018License: CC BYFull-Text: http://hdl.handle.net/10044/1/63384Data sources: Bielefeld Academic Search Engine (BASE)Spiral - Imperial College Digital RepositoryArticle . 2018Data sources: Spiral - Imperial College Digital Repositoryadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1007/s40799-018-0248-z&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2018 United Kingdom, United Kingdom, ItalyPublisher:Springer Science and Business Media LLC Authors:Fantetti A.;
Fantetti A.
Fantetti A. in OpenAIREGastaldi C.;
Gastaldi C.
Gastaldi C. in OpenAIREBerruti T. M.;
Berruti T. M.
Berruti T. M. in OpenAIREhandle: 11583/2706163 , 10044/1/63384
This paper deals with the dynamic of blades with strip dampers. The purpose is 1) to present the results of the dynamic numerical calculation, 2) to demonstrate the need for the experimental data on the blade-strip contact to be used as input to the calculation, 3) to propose a new test rig design to obtain them and 4) to test the key components of the new test rig. The forced responses of two blades coupled by a strip damper are calculated at different excitation and centrifugal force values. The dependence of the numerical results on the contact parameter values is confirmed in this significant reference case. The design of a new test rig is then proposed: both the blade frequency response function and the contact hysteresis cycles at the blade-strip contact are measured. It is shown how contact parameters can then be derived from experimental data. The main novelty of the test rig here proposed is the strip loading system, which simulates the uniform pressure distribution provided by the centrifugal force in real operating conditions. This loading system is non-contact and uses compressed air. Classical loading systems which see dead weights directly connected to the strip are assessed and their expected inadequacy is confirmed. The compressed air system is tested by measuring the pressure produced between strip and blades: pressure is uniform across the contact patch, constant in time and its mean value corresponds to realistic pressure values actually experienced by strip dampers during service.
Publications Open Re... arrow_drop_down Publications Open Repository TOrinoArticle . 2018License: CC BYData sources: Publications Open Repository TOrinoImperial College London: SpiralArticle . 2018License: CC BYFull-Text: http://hdl.handle.net/10044/1/63384Data sources: Bielefeld Academic Search Engine (BASE)Spiral - Imperial College Digital RepositoryArticle . 2018Data sources: Spiral - Imperial College Digital Repositoryadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1007/s40799-018-0248-z&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen hybrid 15 citations 15 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
more_vert Publications Open Re... arrow_drop_down Publications Open Repository TOrinoArticle . 2018License: CC BYData sources: Publications Open Repository TOrinoImperial College London: SpiralArticle . 2018License: CC BYFull-Text: http://hdl.handle.net/10044/1/63384Data sources: Bielefeld Academic Search Engine (BASE)Spiral - Imperial College Digital RepositoryArticle . 2018Data sources: Spiral - Imperial College Digital Repositoryadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1007/s40799-018-0248-z&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal , Other literature type 2017 Italy, United KingdomPublisher:MDPI AG Authors:C. Gastaldi;
C. Gastaldi
C. Gastaldi in OpenAIREA. Fantetti;
A. Fantetti
A. Fantetti in OpenAIRET. M. Berruti;
T. M. Berruti
T. M. Berruti in OpenAIREdoi: 10.3390/app8010034
handle: 11583/2696047 , 10044/1/57515
This paper focuses on flexible friction dampers (or “strips”) mounted on the underside of adjacent turbine blade platforms for sealing and damping purposes. A key parameter to ensure a robust and trustworthy design is the correct prediction of the maximum frequency shift induced by the strip damper coupling adjacent blades. While this topic has been extensively addressed on rigid friction dampers, both experimentally and numerically, no such investigation is available as far as flexible dampers are concerned. This paper builds on the authors’ prior experience with rigid dampers to investigate the peculiarities and challenges of a robust dynamic model of blade-strips systems. The starting point is a numerical tool implementing state-of-the-art techniques for the efficient solution of the nonlinear equations, e.g., multi-harmonic balance method with coupled static solution and state-of-the-art contact elements. The full step-by-step modelling process is here retraced and upgraded to take into account the damper flexibility: for each step, key modelling choices (e.g., mesh size, master nodes selection, contact parameters) which may affect the predicted response are addressed. The outcome is a series of guidelines which will help the designer assign numerical predictions the proper level of trust and outline a much-needed experimental campaign.
Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2017License: CC BYFull-Text: http://www.mdpi.com/2076-3417/8/1/34/pdfData sources: Multidisciplinary Digital Publishing InstitutePublications Open Repository TOrinoArticle . 2018License: CC BYData sources: Publications Open Repository TOrinoImperial College London: SpiralArticle . 2017License: CC BYFull-Text: http://hdl.handle.net/10044/1/57515Data sources: Bielefeld Academic Search Engine (BASE)Spiral - Imperial College Digital RepositoryArticle . 2017Data sources: Spiral - Imperial College Digital Repositoryadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app8010034&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 23 citations 23 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2017License: CC BYFull-Text: http://www.mdpi.com/2076-3417/8/1/34/pdfData sources: Multidisciplinary Digital Publishing InstitutePublications Open Repository TOrinoArticle . 2018License: CC BYData sources: Publications Open Repository TOrinoImperial College London: SpiralArticle . 2017License: CC BYFull-Text: http://hdl.handle.net/10044/1/57515Data sources: Bielefeld Academic Search Engine (BASE)Spiral - Imperial College Digital RepositoryArticle . 2017Data sources: Spiral - Imperial College Digital Repositoryadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app8010034&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal , Other literature type 2017 Italy, United KingdomPublisher:MDPI AG Authors:C. Gastaldi;
C. Gastaldi
C. Gastaldi in OpenAIREA. Fantetti;
A. Fantetti
A. Fantetti in OpenAIRET. M. Berruti;
T. M. Berruti
T. M. Berruti in OpenAIREdoi: 10.3390/app8010034
handle: 11583/2696047 , 10044/1/57515
This paper focuses on flexible friction dampers (or “strips”) mounted on the underside of adjacent turbine blade platforms for sealing and damping purposes. A key parameter to ensure a robust and trustworthy design is the correct prediction of the maximum frequency shift induced by the strip damper coupling adjacent blades. While this topic has been extensively addressed on rigid friction dampers, both experimentally and numerically, no such investigation is available as far as flexible dampers are concerned. This paper builds on the authors’ prior experience with rigid dampers to investigate the peculiarities and challenges of a robust dynamic model of blade-strips systems. The starting point is a numerical tool implementing state-of-the-art techniques for the efficient solution of the nonlinear equations, e.g., multi-harmonic balance method with coupled static solution and state-of-the-art contact elements. The full step-by-step modelling process is here retraced and upgraded to take into account the damper flexibility: for each step, key modelling choices (e.g., mesh size, master nodes selection, contact parameters) which may affect the predicted response are addressed. The outcome is a series of guidelines which will help the designer assign numerical predictions the proper level of trust and outline a much-needed experimental campaign.
Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2017License: CC BYFull-Text: http://www.mdpi.com/2076-3417/8/1/34/pdfData sources: Multidisciplinary Digital Publishing InstitutePublications Open Repository TOrinoArticle . 2018License: CC BYData sources: Publications Open Repository TOrinoImperial College London: SpiralArticle . 2017License: CC BYFull-Text: http://hdl.handle.net/10044/1/57515Data sources: Bielefeld Academic Search Engine (BASE)Spiral - Imperial College Digital RepositoryArticle . 2017Data sources: Spiral - Imperial College Digital Repositoryadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app8010034&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 23 citations 23 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2017License: CC BYFull-Text: http://www.mdpi.com/2076-3417/8/1/34/pdfData sources: Multidisciplinary Digital Publishing InstitutePublications Open Repository TOrinoArticle . 2018License: CC BYData sources: Publications Open Repository TOrinoImperial College London: SpiralArticle . 2017License: CC BYFull-Text: http://hdl.handle.net/10044/1/57515Data sources: Bielefeld Academic Search Engine (BASE)Spiral - Imperial College Digital RepositoryArticle . 2017Data sources: Spiral - Imperial College Digital Repositoryadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app8010034&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu