Eklemeli imalat yöntemiyle üretilen parçalarda rassal titreşim tabanlı topoloji optimizasyonu

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Thesis Type: Postgraduate

Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, -, Turkey

Approval Date: 2023

Thesis Language: Turkish

Student: MERVE YILDIZ BOZER

Supervisor: Oğuzhan Yılmaz

Open Archive Collection: AVESIS Open Access Collection

Abstract:

Additive manufacturing methods are used in many important industrial areas due to the flexibility in design and the ability to manufacture parts made of multiple materials. Since this technology has entered our lives, the design approach has also been changing. The response of structures used in engineering under the influence of static and dynamic forces has a foremost importance in the design phase. Thanks to optimization studies, it is possible to produce parts with complex geometry, light weight and desired mechanical properties. During the cruise of the sea vehicles, many loads are placed on the structure. Vibrations caused by these loads are inevitable. Mechanical vibrations have negative effects on the working performance of antennas and antenna subsystems in marine vehicles. With the additive manufacturing method, it is possible to manufacture complex geometry radar antenna structures and connection brackets. The aim of this thesis is to perform random vibration-based topology optimization analyses on structures produced using the additive manufacturing method. The topology optimization method is used to minimize the vibration loads that the antenna is exposed to under operating conditions and to lighten the weight. With the optimization analysis, a reduction of 52% was obtained. At the same time, the 1st mode value with the highest mass participation factor was found to be 159 Hz in the original structure, while it was found to be 251 Hz in the redesigned structure. Vibration analyses and tests were performed using dynamic loads defined in military standards. As a result of random vibration analysis, the maximum equivalent stress value occurred in the structure was found to be 10 MPa in the original case and 4,2 MPa in the final case.