GOHNI, GONTOR ABDUL (2021) ANALISIS GETARAN VERTICAL AXIS WIND TURBINE KETINGGIAN 2 METER SEBAGAI CANTILEVER BEAM DENGAN MENGGUNAKAN FINITE ELEMENT METHOD DAN METODE NUMERIK. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Anything that has mass and elasticity is capable of vibrating. The amount of natural frequency of a material that vibrates transversely is strongly influenced by the modulus of elasticity of the material, dimension / geometry (cross-sectional area, length). Excessive vibrations or resonances that cause damage to the structure can be anticipated in planning, one way is to determine the value of the natural frequency of an object, the purpose of this study is to determine the natural frequency and stiffness of cantilever structural steel beams with different beam thickness variations. This study uses numerical methods with MATLAB and the Finite Element Method, its application uses ANSYS, structural steel beams supported by cantilever beams are divided into three elements with different sizes, beam width 0.42m, length 2m, thickness variations 0.004m, 0.005m and 0.006. m. The results showed that for numerical calculations at each of the number one frequency, the results were 0.23Hz at 0.004m thickness, 0.23Hz at 0.005m thickness and 0.34Hz at 0.006m thickness. Whereas in the natural frequency in the FEM method, the first frequency on each beam gets 0.81Hz at 0.004m thickness, 1.01Hz at 0.005m thickness and 1.22Hz at 0.006 thickness. The results show that with different beam thicknesses have a major effect on the natural frequency value. this is because the thicker the mass of the beam and the greater the stiffness of the beam. Keyword: cantilever beam, Euler beam theory Semua benda yang memiliki massa dan elastisitas mampu untuk bergetar. Besarnya frekuensi natural suatu bahan yang bergetar secara transversal sangat dipengaruhi oleh modulus elastisitas bahan, dimensi/geometri (luas penampang, panjang). Getaran yang berlebih atau resonansi yang menyebabkan kerusakan pada struktur dapat di antisipasi dalam perencanaan, salah satu caranya adalah mengetahui nilai frekuensi natural dari suatu benda, tujuan dari penelitian ini adalah untuk menentukan frekuensi natural dan kekakuan balok baja struktural kantiliver dengan variasi ketebalan balok yang berbeda. Penelitian ini menggunakan metode numerik dengan MATLAB dan Finite Element Method pengaplikasiannya menggunakan ANSYS, balok baja structural yang di tumpu kantiliver beam di bagi menjadi tiga elemen dengan berbagi ukuran, lebar balok 0,42m, Panjang 2m, variasi ketebalan 0,004m, 0,005m dan 0,006m. Hasil penelitian menunjukkan Untuk perhitungan numerik di masing-masing frekuensi yang nomor satu mendapatkan hasil 0.23hz di ketebalan 0.004m, 0.23hz di ketebalan 0.005m dan 0.34hz di ketebalan 0.006m. Sedangkan di frekuensi natural di metode FEM frekuensi yang pertama pada setiap beam mendapatkan hasil 0.81hz di ketebalan 0.004m, 1.01hz di ketebalan 0.005m dan 1.22hz di ketebalan 0.006.Hasil penelitian menunjukkan bahwa dengan ketebalan balok yang berbeda berpengaruh besar terhadap nilai frekuensi natural di sebabkan semakin tebal beam massa dan kekakuan pada beam tersebut akan semakin besar. Kata kunci: kantiliver beam, eluer beam theory, sismulasi cantilever beam biliah
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