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Topology optimization of mechanical wave filter in curved beam structures : 위상최적화를 이용한 굽음보 구조에서의 기계적 파동필터 설계

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dc.contributor.advisor김윤영-
dc.contributor.author김상아-
dc.date.accessioned2017-07-14T03:46:50Z-
dc.date.available2017-07-14T03:46:50Z-
dc.date.issued2013-02-
dc.identifier.other000000010472-
dc.identifier.urihttps://hdl.handle.net/10371/123977-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부(멀티스케일 기계설계전공), 2013. 2. 김윤영.-
dc.description.abstractWe carried out a design of a mechanical wave filter to reduce wave transmission in a curved beam structure. Filtering phenomenon of the wave transmission in specific frequency range may be seen at infinitely periodic elastic structures composed of different materials. In a curved beam, however, implementation of the periodic structure is very limited. The dimension of the curved region which connects two waveguides is generally not long enough to cover broad target frequency. The periodic structure repeated only in a few times cannot guarantee the performance of wave filtering in the curved beam. To overcome the difficulty, we formulated the design problem of the curved beam as a topology optimization problem. A curved region between two straight waveguides was considered as a design domain to minimize the power transmission of waves at target frequencies. Compared to a periodic curved structure, the designed ones by topology optimization show the improvement of the performance in reducing the wave transmission at the target frequencies.-
dc.description.tableofcontentsAbstract i
Contents 2
List of Figures 4
Chapter1 Introductions 1
Chapter2 Dispersion curve of curved beam structures 4
Chapter3 Dispersion curve of periodic structures 9
3.1 Bragg Condition 9
3.2 Matrix Representation of Wave Motion 11
3.3 Transfer Matrix of Periodic Structure 13
3.4 Dispersion Curve of Periodic Structure 16
Chapter4 Finite element analysis of curved beam structures 21
4.1 Calculation of Power Coefficient 21
4.2 PML 23
Chapter5 Topology Optimization Formulation 27
5.1 Problem Definition 27
5.2 Optimization Formulation 28
Chapter6 Numerical Example 31
6.1 Optimization for curved beam structure 31
6.2 Result for different target frequency 31
6.3 Comparison between periodic and optimized curved beam 32
Conclusion 37
Acknowledgement 38
References 39
초록 42
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dc.formatapplication/pdf-
dc.format.extent1564520 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjecttopology optimization-
dc.subjectmechanical filter-
dc.subjectcurved beam-
dc.titleTopology optimization of mechanical wave filter in curved beam structures-
dc.title.alternative위상최적화를 이용한 굽음보 구조에서의 기계적 파동필터 설계-
dc.typeThesis-
dc.description.degreeMaster-
dc.citation.pages42-
dc.contributor.affiliation공과대학 기계항공공학부(멀티스케일 기계설계전공)-
dc.date.awarded2013-02-
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