Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Now showing 1 - 4 of 4
  • Master Thesis
    Investigation of the Effect of the Spacing Between Orifices on the Damping Performance in Passive-Tuned Liquid Column Dampers
    (01. Izmir Institute of Technology, 2024) Karakuş, Ozan; Özkol, Ünver; Özkol, Ünver; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Yapısal hareketler, sönümley􀵴c􀵴 tasarımı ve bunların 􀵴l􀵴şk􀵴ler􀵴 yapı d􀵴nam􀵴ğ􀵴n􀵴n ana konularıdır. Sönümleme s􀵴stemler􀵴, oluşab􀵴lecek her türlü dış uyartımı d􀵴kkate alarak yapıları stab􀵴l􀵴ze etmek 􀵴ç􀵴n tasarlanmıştır. Yapısal hareketler􀵴n azaltılması yapıların bütünlüğünü koruyab􀵴lmes􀵴 açısından son derece öneml􀵴d􀵴r. Bu sönümleme s􀵴stemler􀵴 genel olarak akt􀵴f ve pas􀵴f sönümleme s􀵴stemler􀵴 olmak üzere 􀵴k􀵴 sınıfta toplanır. Pas􀵴f Ayarlı Sıvı Kolon Sönümley􀵴c􀵴ler -TLCD- bas􀵴t yapıları ve dışarıdan b􀵴r enerj􀵴 g􀵴r􀵴ş􀵴 gerekt􀵴rmemes􀵴 neden􀵴yle prat􀵴kte terc􀵴h ed􀵴len s􀵴stemlerd􀵴r ve bu nedenle yapısal salınımların bastırılmasında etk􀵴n b􀵴r şek􀵴lde kullanılab􀵴l􀵴rler. Bu tezde, TLCD'n􀵴n sönüm performansı, özell􀵴kle yük kaybı katsayısının sıvı kolon performansı üzer􀵴ndek􀵴 etk􀵴s􀵴 d􀵴kkate alınarak 􀵴ncelenm􀵴şt􀵴r. Anal􀵴t􀵴k b􀵴r model üret􀵴ld􀵴 ve hareket denklem􀵴 1 boyutlu olarak çözüldü. İk􀵴 del􀵴ğ􀵴n b􀵴rb􀵴r􀵴ne yakın olması durumunda anal􀵴t􀵴k çözümler􀵴n doğrulanması ve anal􀵴t􀵴k model􀵴n yeterl􀵴 olmadığı durumlarda da b􀵴lg􀵴 elde etmek amacıyla deneyler yapılmıştır. Yük kaybı katsayısının hesaplanması b􀵴rçok çalışmada araştırılmış ve amp􀵴r􀵴k formülasyonlar öner􀵴lm􀵴şt􀵴r, ancak sıvı kolonun yük kaybı değer􀵴 b􀵴r d􀵴z􀵴 deney uygulanarak elde ed􀵴leb􀵴l􀵴r. Ayarlanmış sıvı kolon damper􀵴n􀵴n yük kaybı değer􀵴n􀵴 elde etmek 􀵴ç􀵴n deneysel b􀵴r tasarım kullanıldı. Yük kaybı katsayısının, ayarlanmış sıvı kolon damperler􀵴n􀵴n sönümleme performansı üzer􀵴ndek􀵴 etk􀵴s􀵴n􀵴 gözlemlemek 􀵴ç􀵴n b􀵴r d􀵴z􀵴 deney tamamlandı. Deneysel ve anal􀵴t􀵴k sonuçlara göre s􀵴stem􀵴n sönüm oranı 􀵴le damper􀵴n yük kayıp katsayısı arasında b􀵴r 􀵴l􀵴şk􀵴 tesp􀵴t ed􀵴lm􀵴şt􀵴r. TLCD'n􀵴n performansının maks􀵴muma çıkarılab􀵴leceğ􀵴 􀵴k􀵴 del􀵴k arasında opt􀵴mum b􀵴r aralık olduğu deneysel olarak tesp􀵴t ed􀵴lm􀵴şt􀵴r. Ayrıca deneysel sonuçlara göre s􀵴stem􀵴n sönümleme katsayısının %10.5 oranında gel􀵴şt􀵴ğ􀵴 not ed􀵴lm􀵴şt􀵴r.
  • Master Thesis
    Vibration Analysis of Rotating Curved Beams With Variable Cross-Section
    (Izmir Institute of Technology, 2014) Kartav, Osman; Yardımoğlu, Bülent; Kartav, Osman; Yardımoğlu, Bülent; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    In this study, in-plane free vibration characteristics of rotating curved beams are investigated by Finite Difference Method and Finite Element Method since the mathematical model of the present problem is based on the differential eigenvalue problem with variable coefficients. A computer program regarding the titled problem is developed in Mathematica and this program is verified by using results available in the literature. The effects of taper parameters of the curved beam and rotation speed on natural frequencies are investigated.
  • Master Thesis
    Vibration Analysis of Pre-Twisted Rotating Beams
    (Izmir Institute of Technology, 2003) Yıldırım, Tolga; Yardımoğlu, Bülent; Yardımoğlu, Bülent; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    A new linearly pretwisted rotating Timoshenko beam element, which has two nodes and four degrees of freedom per node, is developed and subsequently used for vibration analysis of pretwisted beams with uniform rectangular cross-section. First, displacement functions based on two coupled displacement fields (the polynomial coefficients are coupled through consideration of the differential equations of equilibrium) are derived for pretwisted beams. Next, the stiffness and mass matrices of the finite element model are obtained by using the energy expressions. Finally, the natural frequencies of pretwisted rotating Timoshenko beams are obtained and compared with previously published both theoretical and experimental results to confirm the accuracy and efficiency of the present model. The new pretwisted Timoshenko beam element has good convergence characteristics and excellent agreement is found with the previous studies.
  • Master Thesis
    Out-Of Vibrations of Planar Curved Beams Having Variable Curvature and Cross-Section
    (Izmir Institute of Technology, 2012) Kaygısız, Kaan; Yardımoğlu, Bülent; Yardımoğlu, Bülent; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    In this study, out of plane vibration characteristics of curved beams having variable curvatures and cross-sections are studied by FDM (Finite Difference Method). The effects of curvature and cross-section of the curved beam on natural frequencies are investigated for the curved beams having; variable curvature & constant cross-section and variable curvature & variable cross-section. Mathematical model of the present problem is based on the coupled differential eigenvalue problem with variable coefficients. Numerical solutions of the problem in this study are obtained by the computer program developed in Mathematica. The accuracy of the present results obtained from the developed program is evaluated by comparing with FEM (Finite Element Method) results found from solid model created in ANSYS. Good agreement is obtained in the comparisons of the present results with other results. All results are presented in tabular and graphical forms.