IRFAN MAHYUNIS, 1015021006 (2014) ANALISIS TEGANGAN DAN EKSPANSI VOLUME PADA TANGKI TOROIDAL BERPENAMPANG OVAL DENGAN BEBAN TEKANAN INTERNAL. Fakultas Teknik, Universitas Lampung.
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Abstrak
abstrak indonesia Persediaan Bahan Bakar Minyak (BBM) yang semakin berkurang membuat pemerintah berusaha mengkonversi BBM ke Bahan Bakar Gas (BBG). Untuk itu, dibutuhkan penelitian-penelitian yang mendukung program pemerintah tersebut. Salah satu bidang penelitiannya yaitu dalam bidang tangki penyimpanan BBG dalam kendaraanya. Berdasarkan penelitian sebelumnya diketahui bahwa bentuk toroidal lebih baik dalam menahan stress dibandingkan bentuk silinder yang ada saat ini. Oleh karena itu, penelitian diperluas dengan memfungsikan bentuk toroidal berpenampang oval kedalam kendaraan roda empat. Secara Teori Membran bahwa semakin besar Rasio R/r, maka semakin tinggi limit tekanannya, tetapi di satu sisi semakin besar Rasio R/r maka semakin kecil volumenya. Dalam menentukan rancangan tangki toroidal terbaik, maka dipilih perbandingan jari-jari dan ovality terbaik yang dapat memberikan limit tekanan tertinggi pada tangki toroidal. Hasil analisis menunjukkan bahwa limit tekanan tertinggi diberikan oleh rasio R/r 3,4. Untuk simulasi penampang ovality baik in-plane maupun out-plane menunjukkan bahwa penampang dengan ovality 0% menghasilkan limit tekanan yang paling tinggi dalam menahan stress maksimum tangki. Berdasarkan simulasi pada ukuran tersebut didapat bahwa tangki ini memiliki limit tekanan mencapai 1,089 kali tekanan yield (py) dan pertambahan volume sebesar 0,238%. Kata Kunci : tangki toroidal, limit tekanan, ovality absrtract inggris In order to reduce the Public Service Obligation (PSO/Subsidi) on oil fuel, the government of Indonesia proposed to convert oil fuel to gas fuel (LPG) for passenger cars. To support this program, studies are needed to develop technology in combustion system. One of the systems is storage tank that must be carefully designed to avoid burst type failure. Some previous research shows that circular cross-section toroidal tank can withstand higher limit pressure than an equivalen cylindrical shape. In this research, studies of the pressurized toroidal tank is extended for oval cross-section that might be needed because of space restriction. The toroidal tank will be placed on the position of spare wheel of a passenger car. Membran theory of toroidal shell shows that the higher the radius ratio (R/r) the higher the limit pressure, however the corresponding volume become small. To cater for this, geometry optimation was performed and radius ratio of 3.4 was obtained based on circular cross-section. Studies on the influence of ovality on limit pressure were then extended and the results shows that ovality of 0% (circular cross-section) withstand highest limit pressure both for in-plane and outof- plane ovality i.e., 1.089 times pressure to yield (py). Corresponding volume expansion was 0.238%. Keywords : toroidal tank, limit pressure, ovality
| Tipe Karya Ilmiah: | Skripsi |
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| Subyek: | |
| Program Studi: | Fakultas Teknik > Prodi S1-Teknik Mesin |
| Depositing User: | Library Unila |
| Date Deposited: | 19 Nov 2014 02:57 |
| Last Modified: | 19 Nov 2014 02:57 |
| URI: | http://digilib.unila.ac.id/id/eprint/5386 |
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