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    <completedYear/>
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    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst>469</pageFirst>
    <pageLast>472</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>Deutsche Gesellschaft für Akustik</publisherName>
    <publisherPlace>Berlin</publisherPlace>
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    <contributingCorporation/>
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    <completedDate>2018-05-02</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Untersuchung des Modalverhaltens strukturierter Bleche</title>
    <parentTitle language="deu">Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung für Akustik, 19.-22. März 2018 in München</parentTitle>
    <identifier type="url">https://www-docs.b-tu.de/fg-akustik/public/veroeffentlichungen/henke_modalverhalten_daga2018.pdf</identifier>
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    <author>
      <firstName>Anna-Sophia</firstName>
      <lastName>Henke</lastName>
    </author>
    <submitter>
      <firstName>Thomas</firstName>
      <lastName>Geyer</lastName>
    </submitter>
    <author>
      <firstName>Martin</firstName>
      <lastName>Noack</lastName>
    </author>
    <author>
      <firstName>Ennes</firstName>
      <lastName>Sarradj</lastName>
    </author>
    <collection role="institutes" number="3505">FG Strukturmechanik und Fahrzeugschwingungen</collection>
    <collection role="institutes" number="3506">FG Technische Akustik</collection>
  </doc>
  <doc>
    <id>23571</id>
    <completedYear/>
    <publishedYear>2019</publishedYear>
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    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>13</pageNumber>
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    <completedDate>2019-02-24</completedDate>
    <publishedDate>--</publishedDate>
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    <title language="eng">Calculation of the Modal Behavior of Structured Sheet Metal</title>
    <parentTitle language="eng">International Journal of Lightweight Materials and Manufacture</parentTitle>
    <identifier type="doi">10.1016/j.ijlmm.2019.01.004</identifier>
    <identifier type="issn">2588-8404</identifier>
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    <author>
      <firstName>Anna-Sophia</firstName>
      <lastName>Henke</lastName>
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    <submitter>
      <firstName>Thomas</firstName>
      <lastName>Geyer</lastName>
    </submitter>
    <author>
      <firstName>Martin</firstName>
      <lastName>Noack</lastName>
    </author>
    <author>
      <firstName>Thomas</firstName>
      <lastName>Geyer</lastName>
    </author>
    <author>
      <firstName>Christoph Rocky</firstName>
      <lastName>Heinrich</lastName>
    </author>
    <author>
      <firstName>Bernd</firstName>
      <lastName>Beirow</lastName>
    </author>
    <author>
      <firstName>Ennes</firstName>
      <lastName>Sarradj</lastName>
    </author>
    <author>
      <firstName>Arnold</firstName>
      <lastName>Kühhorn</lastName>
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    <collection role="institutes" number="3506">FG Technische Akustik</collection>
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  <doc>
    <id>27669</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1997</pageFirst>
    <pageLast>2007</pageLast>
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    <issue>4</issue>
    <volume>64</volume>
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    <completedDate>2021-08-02</completedDate>
    <publishedDate>--</publishedDate>
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    <title language="eng">A new stress-based topology optimization approach for finding flexible structures</title>
    <abstract language="eng">This paper presents a new FE-based stress-related topology optimization approach for finding bending governed flexible designs. Thereby, the knowledge about an output displacement or force as well as the detailed mounting position is not necessary for the application. The newly developed objective function makes use of the varying stress distribution in the cross section of flexible structures. Hence, each element of the design space must be evaluated with respect to its stress state. Therefore, the method prefers elements experiencing a bending or shear load over elements which are mainly subjected to membrane stresses. In order to determine the stress state of the elements, we use the principal stresses at the Gauss points. For demonstrating the feasibility of the new topology optimization approach, three academic examples are presented and discussed. As a result, the developed sensitivity-based algorithm is able to find usable flexible design concepts with a nearly discrete 0 − 1 density distribution for these examples.</abstract>
    <parentTitle language="eng">Structural and Multidisciplinary Optimization</parentTitle>
    <identifier type="issn">1615-147X</identifier>
    <identifier type="doi">10.1007/s00158-021-02960-w</identifier>
    <identifier type="issn">1615-1488</identifier>
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    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Martin</firstName>
      <lastName>Noack</lastName>
    </author>
    <submitter>
      <firstName>Katrin</firstName>
      <lastName>Weyer</lastName>
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    <author>
      <firstName>Arnold</firstName>
      <lastName>Kühhorn</lastName>
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    <author>
      <firstName>Markus</firstName>
      <lastName>Kober</lastName>
    </author>
    <author>
      <firstName>Matthias</firstName>
      <lastName>Firl</lastName>
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    <subject>
      <language>eng</language>
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      <value>Topology optimization</value>
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    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Flexible structure</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Stress-based</value>
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    <subject>
      <language>eng</language>
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      <value>SIMP</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Conceptual design</value>
    </subject>
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  </doc>
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    <id>36448</id>
    <completedYear/>
    <publishedYear>2025</publishedYear>
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    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>15</pageLast>
    <pageNumber>15</pageNumber>
    <edition/>
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    <type>articler</type>
    <publisherName>ASME International</publisherName>
    <publisherPlace>New York</publisherPlace>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2025-09-03</completedDate>
    <publishedDate>--</publishedDate>
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    <title language="eng">Implementation of intentional mistuning by means of finite element based shape optimization</title>
    <abstract language="eng">Intentional Mistuning has turned out to be an effective measure to alleviate the maximum forced response of bladed wheels in the framework of numerous studies in the past. In particular solutions based on two different blade designs, following e.g. alternating or AABB patterns, have proved to be promising in this regard and moreover robust against the impact of unavoidable random mistuning. Thus, for example, a 40 percent reduction of the first blade bending maximum forced response has been proved experimentally for a turbine impeller of a turbo charger application. Despite this success, the technical implementation of the frequency based mistuning pattern followed an academic solution based on locally removing material at the leading edge tip, which is not suited for the use in serial wheels since it may disturb the flow channel. In addition, the forced response of other blade modes may be affected in a negative manner. In order to overcome these problems, an alternative way of implementing Intentional Mistuning is suggested by applying a marginal geometric modification of the blade thickness distribution to adjust the natural frequency of the first bending mode. Finite element based shape optimization is utilized to this end. Secondary conditions are ensuring that only the target frequency of the first bending mode is adjusted whereas natural frequencies of other modes are kept almost unchanged.</abstract>
    <parentTitle language="eng">Journal of engineering for gas turbines and power</parentTitle>
    <identifier type="doi">10.1115/1.4069624</identifier>
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    <author>
      <firstName>Bernd</firstName>
      <lastName>Beirow</lastName>
    </author>
    <submitter>
      <firstName>Katrin</firstName>
      <lastName>Kunze</lastName>
    </submitter>
    <author>
      <firstName>Alex</firstName>
      <lastName>Nakos</lastName>
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    <author>
      <firstName>Caroline</firstName>
      <lastName>Stecklina</lastName>
    </author>
    <author>
      <firstName>Martin</firstName>
      <lastName>Noack</lastName>
    </author>
    <author>
      <firstName>Matthias</firstName>
      <lastName>Firl</lastName>
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    <author>
      <firstName>Marios</firstName>
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    <id>36444</id>
    <completedYear/>
    <publishedYear>2025</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>11</pageNumber>
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    <publisherName>The American Society of Mechanical Engineers</publisherName>
    <publisherPlace>New York, NY</publisherPlace>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2025-09-03</completedDate>
    <publishedDate>--</publishedDate>
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    <title language="eng">Implementation of intentional mistuning by means of finite element based shape optimization</title>
    <abstract language="eng">Intentional Mistuning has turned out to be an effective measure to alleviate the maximum forced response of bladed wheels in the framework of numerous studies in the past. In particular solutions based on two different blade designs, following e.g. alternating or AABB patterns, have proved to be promising in this regard and moreover robust against the impact of unavoidable random mistuning. Thus, for example, a 40 percent reduction of the first blade bending maximum forced response has been proved experimentally for a turbine impeller of a turbo charger application. Despite this success, the technical implementation of the frequency based mistuning pattern followed an academic solution based on locally removing material at the leading edge tip, which is not suited for the use in serial wheels since it may disturb the flow channel. In addition, the forced response of other blade modes may be affected in a negative manner. In order to overcome these problems, an alternative way of implementing Intentional Mistuning is suggested by applying a marginal geometric modification of the blade thickness distribution to adjust the natural frequency of the first bending mode. Finite element based shape optimization is utilized to this end. Secondary conditions are ensuring that only the target frequency of the first bending mode is adjusted whereas natural frequencies of other modes are kept almost unchanged.</abstract>
    <parentTitle language="eng">Proceedings of the ASME Turbo Expo 2025, Memphis, June 16–20, 2025</parentTitle>
    <subTitle language="eng">Volume 9 : structures and dynamics : structural mechanics &amp; vibration; supercritical CO2</subTitle>
    <identifier type="doi">10.1115/GT2025-151617</identifier>
    <identifier type="isbn">978-0-7918-8885-8</identifier>
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    <enrichment key="opus.source">publish</enrichment>
    <author>
      <firstName>Bernd</firstName>
      <lastName>Beirow</lastName>
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    <submitter>
      <firstName>Katrin</firstName>
      <lastName>Kunze</lastName>
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    <author>
      <firstName>Alex</firstName>
      <lastName>Nakos</lastName>
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      <firstName>Caroline</firstName>
      <lastName>Stecklina</lastName>
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      <firstName>Martin</firstName>
      <lastName>Noack</lastName>
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    <author>
      <firstName>Matthias</firstName>
      <lastName>Firl</lastName>
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    <author>
      <firstName>Marios</firstName>
      <lastName>Sasakaros</lastName>
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    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Intentional Mistuning</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Turbine Impeller</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Forced Response</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Shape Optimization</value>
    </subject>
    <collection role="institutes" number="3505">FG Strukturmechanik und Fahrzeugschwingungen</collection>
  </doc>
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