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Strength Analysis and Assessment of Ina-TEWS Wave Glider Priohutomo, Kusnindar; Nugroho, Wibowo Harso; Yulfani, Rosi Dwi
International Journal of Natural Science and Engineering Vol 4, No 3 (2020)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/ijnse.v4i3.29873

Indonesia as a country that often experiences tsunami disasters needs to have an early warning system against tsunami disasters. This system can use various existing technologies, one of which is the tsunami buoy system. The new tsunami buoy system does not use the natural mooring system but uses the wave glider system. This paper discusses the structural strength of the surface floater of wave glider using Eva Foam and Fiberglass material for skin and Alluminium material for frame and kell. The surface floater using 16 pieces for frame and 1 piece for keel. Enviromental loads is use in this paper like hydrodynamics load and weight load. The results from this paper is material from Eva Foam has a maximum principle stress is 12693 Pa and shear stress is 6114.6 Pa. For material from Fiberglass has maximum principle stress is 11.875 Pa and shear stress is 6076.3 Pa. Safety factor (SF) from maximum principle stress and shear stress for Eva Foams is up to 6x and SF for maximum principle and shear stress for Fiberglass is up to 26x. Conclusions for this paper is the desain for surface floater of wave glider it can be operated in the sea with draugh 0.18 m.

Fatigue Life Prediction of the Keel Structure of a Tsunami Buoy Using Spectral Fatigue Analysis Method Yustiawan, Angga; Suastika, Ketut; Nugroho, Wibowo Harso
Makara Journal of Technology Vol. 17, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

One of the components of the Indonesia Tsunami Early Warning System (InaTEWS) is a surface buoy. The surface buoy is exposed to dynamic and random loadings while operating at sea, particularly due to waves. Because of the cyclic nature of the wave load, this may result in a fatigue damage of the keel structure, which connects the mooring line with the buoy hull. The operating location of the buoy is off the Java South Coast at the coordinate (10.3998 S, 108.3417 E). To determine the stress transfer function, model tests were performed, measuring the buoy motions and the stress at the mooring line. A spectral fatigue analysis method is applied for the purpose of estimating the fatigue life of the keel structure. Utilizing the model-test results, the S-N curve obtained in a previous study and the wave data at the buoy location, it is found that the fatigue life of the keel structure is approximately 11 years.

Rangkaian Transmisi Mesin Chopper Pakan Ternak Dengan Konsep Two in One Giananda, Hosea; Nugroho, Wibowo Harso
Prosiding SEMNAS INOTEK (Seminar Nasional Inovasi Teknologi) Vol. 8 No. 1 (2024): SEMINAR NASIONAL INOVASI TEKNOLOGI 2024
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/inotek.v8i1.4957

Pakan merupakan salah satu faktor yang mempengaruhi keberlangsungan usaha peternakan. Dalam memenuhi kebutuhan pakan, peternak menggunakan jenis pakan hijauan dan campuran. Untuk memenuhi kebutuhan peternak maka perancangan mesin chopper two in one dilakukan, yang dapat digunakan untuk mencacah dan mencampur pakan ternak. Perancangan ini penting untuk meningkatkan efisiensi dan keberlanjutan dalam produksi pakan ternak. Metode penelitian meliputi pengumpulan data melalui studi literatur dan observasi secara langsung. Sistem transmisi yang di gunakan menghasilkan putaran akhir 909 RPM pada poros pencacah dan 770 RPM pada gearbox. Lalu output gearbox dengan rasio 1:40 untuk mencapai putaran akhir 19 RPM. Pada poros menunjukkan tekanan puntir tertinggi pada poros pengaduk sebesar 43.891.515 kg/mm² dan terendah pada poros penghubung sebesar 1.975,4 kg/mm² , angka itu merupakan tekanan maksimal yang diterima. Tegangan geser diizinkan untuk semua poros adalah 3.867 kg/mm². Masa pakai bantalan menunjukkan hasil yang tinggi dengan pencacah memiliki masa pakai 1,147,000 jam kerja.

Control system optimisation of biodiesel-based gas turbine for ship propulsion Machmudah, Affiani; Bakar, Elmi Abu; Rajendran, Raj; Nugroho, Wibowo Harso; Solihin, Mahmud Iwan; Ghofur, Abdul
IAES International Journal of Artificial Intelligence (IJ-AI) Vol 13, No 2: June 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijai.v13.i2.pp1992-2002

Reducing a gas emission of shipping transportations become a main goal of international maritime organization to achieve a clean energy. One of best scenarios to achieve this goal is to shift a fossil fuel to a renewable energy-based fuel of a ship propulsion. This paper studies an optimization of a control system of the renewable-based small gas turbine engine for the ship propulsion. Proposed control system consists of a proportional-integral with engine performance limiters to avoid an engine damage. Proportional-integral gains are tuned by a whale optimization algorithm. A gain scheduling analysis of a step response is performed to obtain a searching area of tuning parameters and values of constant gains. In this step, the gains are modeled as function of plant variables. After the searching area is obtained, the proportional-integral gains are optimized using the whale optimization algorithm while the additional gains are set as constant values. Using this scenario, stable and optimal gains have been successfully achieved. Results show that the proposed method has better performance than that of the previous methods, i.e. gain scheduling and gain scheduling optimized by the whale optimization algorithm. The proposed method has lowest fitness value and does not have an overshoot problem.

Aplikasi Screw Press Pada Mesin Pemarut Dan Pemeras Singkong Multifungsi Guna Meningkatkan Produktivitas UMKM Kerupuk Sadariyah Di Desa Puhjajar Nadliroh, Kuni; Nugroho, Wibowo Harso; Sugianto, Arif; Istiqlaliyah, Hesti
Jurnal Pengabdian Masyarakat Nusantara Vol 4 No 1 (2024): Desember 2024
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/dimastara.v4i1.23979

Kerupuk sadariyah merupakan salah satu produk yang dihasilkan dari bahan baku singkong atau ketela pohon, dimana dalam proses pengolahannya harus melalui beberapa tahapan. Mulai dari pengupasan kulit, pencucian, pemarutan, pemerasan, pemasakan, perajangan lontongan kerupuk hingga penggorengan. Dalam serangkaian kegiatan produksi tersebut, beberapa proses masih dikerjakan secara manual. Sehingga membutuhkan banyak waktu dan tenaga kerja yang pada akhirnya berimbas pada besarnya biaya dan kapasitas produksinya. Hal ini yang menjadikan sering terjadi keterlambatan pengiriman dan dapat mengakibatkan kekecewaan konsumen. Dari permasalahan tersebut, tim pengabdian kepada Masyarakat Universitas Nusantara PGRI kediri mencoba membantu menyelesaikan permasalahan yang dihadapi produsen dengan merancang satu mesin pemarut dan pemeras singkong multifungsi yang mengaplikasikan sistem srew press. Hasil yang diperoleh setelah menggunakan mesin ini adalah peningkatan kapasitas produksi yang awalnya hanya mencapai 300kg/hari menjadi sekitar 350kg/hari. Produsen tentunya sangat terbantu dengan adanya mesin perajang ini, mereka pada ahirnya mampu memenuhi permintaan pasar yang cukup tinggi.

Fatigue Life Analysis of Mooring Cleats on The N219A Aircraft Floater Based on Numerical Simulation Yulfani, Rosi Dwi; Rosyid, Daniel M.; Nugroho, Wibowo Harso; Priohutomo, Kusnindar; Sugiarto, Moh. Muria Armansyah; Arianti, Erdina
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 5, Number 2, July 2024 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v5i2.42798

One of the procedures for rescuing a seaplane after an operational is to secure it, namely by mooring at an available port or mooring at a mooring buoy. This mooring buoy is considered a vehicle necessary for securing seaplanes in coastal conditions where it is not yet possible to build infrastructure in the form of an amphiport. To overcome this problem, seaplanes need to add a mooring cleat at the end of the bow of each float, which attaches the rope to the mooring buoy itself. So, it is necessary to study the strength of the mooring cleat itself when withstanding environmental loads. This study was carried out by modelling the mooring cleat using the finite element method to determine where the most significant stresses occur in the mooring cleat structure. Mooring cleats are modelled on deck thickness with varying thicknesses of 20mm and 40mm. The stress that occurred in the mooring cleat structure is then calculated using the Palmgren-Miner rule to determine the fatigue life of the mooring cleat for each variation. It was found that the largest von Misses stress experienced by the structure using 7075-T6 aluminium material was 147.87 MPa, which occurred in the mooring cleat, which was located on the 20mm deck thickness variation at the portside. Meanwhile, this variation's most extended fatigue life calculation occurred for the 40mm deck thickness variation on the portside with 514.43 years.

Strength Analysis and Assessment of Ina-TEWS Wave Glider Priohutomo, Kusnindar; Nugroho, Wibowo Harso; Yulfani, Rosi Dwi
International Journal of Natural Science and Engineering Vol. 4 No. 3 (2020): October
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Indonesia as a country that often experiences tsunami disasters needs to have an early warning system against tsunami disasters. This system can use various existing technologies, one of which is the tsunami buoy system. The new tsunami buoy system does not use the natural mooring system but uses the wave glider system. This paper discusses the structural strength of the surface floater of wave glider using Eva Foam and Fiberglass material for skin and Alluminium material for frame and kell. The surface floater using 16 pieces for frame and 1 piece for keel. Enviromental loads is use in this paper like hydrodynamics load and weight load. The results from this paper is material from Eva Foam has a maximum principle stress is 12693 Pa and shear stress is 6114.6 Pa. For material from Fiberglass has maximum principle stress is 11.875 Pa and shear stress is 6076.3 Pa. Safety factor (SF) from maximum principle stress and shear stress for Eva Foams is up to 6x and SF for maximum principle and shear stress for Fiberglass is up to 26x. Conclusions for this paper is the desain for surface floater of wave glider it can be operated in the sea with draugh 0.18 m.

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