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All Journal IAES International Journal of Artificial Intelligence (IJ-AI) KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan IPTEK The Journal for Technology and Science Wave: Jurnal Ilmiah Teknologi Maritim Jurnal Kesehatan Jurnal Bahana Kesehatan Masyarakat (Bahana of Journal Public Health) Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Jurnal PADE: Pengabdian & Edukasi Nasuwakes : Jurnal Kesehatan Ilmiah Journal of Health Science and Medical Therapy Jurnal Pemikiran dan Pengembangan Pembelajaran
Erwandi Erwandi
BPP- Laboratorium Hydrodinamika Indonenesia, Surabaya
Aerospace Engineering Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Education Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Public Health Veterinary

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ANALISA GELOMBANG JANGKA WAKTU PANJANG UNTUK PERAIRAN SELATAN SUKABUMI Erwandi, Erwandi; Mintarso, Cahyadi
Wave: Jurnal Ilmiah Teknologi Maritim Vol 3, No 1 (2009)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (140.611 KB) | DOI: 10.29122/jurnalwave.v3i1.4112

Abstract

Agar pelaksanaan kegiatan Rancangan Pembangkit Listrik Tenaga Ombak (PLTO-Nagalistrik) dapat efektif bekerja serta menghasilkan energi listrik sesuai dengan desain (target yang ingin dicapai) maka diperlukan analisa prediksi gelombang jangka waktu panjang menurut rencana daerahyang dipakai sebagai kandidat penempatan PLTO-Nagalistrik . Analisa gelombang jangka waktu panjang tujuannya adalah untuk memprediksi dan merekonstruksi satu per tiga tinggi gelombang rata-rata tertinggi yang akan terjadi dalam jangka 1 tahun, 5 tahun, 10 tahun mendatang.
Validation of Lumped Mass Lateral Cantilever Shaft Vibration Simulation on Fixed-Pitch Vertical-Axis Ocean Current Turbine Hantoro, R. Hantoro; Utama, I. K. A. P. Utama; Sulisetyono, A. Sulisetyono; Erwandi, Erwandi
IPTEK The Journal for Technology and Science Vol 21, No 3 (2010)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v21i3.43

Abstract

Research on the emergence of force fluctuations and shaft vibration responses of ocean currents turbine generator become a serious concern to the researchers. This paper was conducted with the aim of investigation into the characteristics of lateral shaft vibration of a fixed-pitch vertical-axis ocean current turbine (VAOCT). The work was carried out numerically and experimentally using tank test. A cantilever type of shaft has been used and modeled using finite element method, and simulated using lumped mass matrix to obtain the vibration characteristics and responses. Variations of incoming fluid velocity and the corresponding rotation velocity (rpm) of VAOCT were used to identify the pattern of lateral displacement responses. Analysis of displacement responses at all nodes in x and y-direction at the same time was carried out. The presents of displacement shapes recognized have close agreement to the 1st mode shape. Potential problems on the tip of shaft obviously due to half of the force of turbine received concentrated at cantilever tip. The pattern of vibration responses from the test data shows suitable with simulation. Periodic pattern responses resulted from simulation and experiment at the validated node produce the minimum displacement error of 14% at Var-3 (U=1 m/s) and maximum of 24% at Var-2 (U=0.9 m/s).
The Comparison of Risk Factors for Stunting in Rural and City in Lampung Aprina, Aprina; Astuti, Titi; Sanee, Aree; Erwandi, Erwandi; Shodiq, Munawar
Jurnal Kesehatan Vol 14 No 1 (2023): Jurnal Kesehatan
Publisher : Poltekkes Kemenkes Tanjung Karang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26630/jk.v14i1.3776

Abstract

Globally, Rural areas have more stunted children (40%) than urban areas (33%). In contrast, in Indonesia, In 2010-2013, the prevalence of stunting in rural areas was higher than in urban areas at 40 0% and urban areas by 31.5%. This type of quantitative research uses Cross Sectional approach with the aim of study to compare risk factors for stunting in rural areas and Lampung City in 2022. The research subjects are mothers and toddlers 30 are rural, and 30 are in town. The analysis in this study used the independent t-test, Mann-Whitney, chi-square, and Fisher tests; the results showed a comparison of birth length, exclusive breastfeeding, birth spacing, economic status, and environmental factors to the incidence of stunting in cities and villages in 2022. There was no comparison of birth weight, breastfeeding for up to 2 years, depression status, number of children, parenting, dietary, and Nutrition Patterns During Pregnancy on Stunting Incidents in Cities and Villages. The dominant factors influencing stunting in cities and villages based on the results of multivariate analysis of Birth spacing. There is a comparative risk factor for stunting in both rural and urban areas in Lampung province. Stunting prevention efforts by preventing early marriage, increasing the ease of access to health services in peripheral/remote sites to reduce the distance to reach health facilities, and preventing the occurrence of Low Birth Weight Babies through various promotional efforts in preventive.
System Performance Characteristics of Darrieus Turbine with Tilted Blades in Current and Wave Conditions Suyanto, Eko Marta; Fitri, Sutopo Purwono; Erwandi, Erwandi; Rahuna, Daif; Kasharjanto, Afian
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.54524

Abstract

Indonesia has abundant sources of renewable energy from ocean currents and waves, or a mixture of currents and waves at certain times to be used as an energy source for power plants. So at the Indonesian Hydrodynamics Laboratory, a study has been carried out to determine the performance of the Darrieus-type vertical axis turbine model to utilize the energy of ocean currents and waves. But the Darrieus Turbine with the turbine blades positioned perpendicular to the turbine axis cannot rotate if there is only wave force. Then several turbine models were made with the placement of the blades in an inclined position, to produce optimal rotor rotation in current conditions or a mixture of currents and waves. This paper describes the testing of 3 turbine models by varying the angle of inclination of the turbine blades (45°, 60°, and 75°), but still having the same turbine rotor area and giving different input currents and wave periods to produce the best efficiency and rotation in absorb current energy or a mixture of current and wave energy. The test results show that the 3 models of slanted blade turbines can absorb both wave and current energy, but turbines with 75° blade inclination produce the best performance compared to the others when exposed to currents and waves
Numerical Analysis of The Effects of Propeller High Thrust Distribution on Propulsion System Performance Sandjaja, Irfan Eko; Ariana, I Made; Erwandi, Erwandi; Indiaryanto, Mahendra; Muryadin, Muryadin; Adietya, Berlian Arswendo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.54715

Abstract

High ship propulsion performance is the main goal of designers, propeller is one component of the propulsion system that also affects the performance of the propulsion. In propeller planning, it is necessary to pay attention to the efficiency of the propeller, in addition to reducing ship operating costs and reducing CO2 gas emissions which is one of the requirements for ships built above 2013, the rules have been made into the Energy Efficiency Design Index (EEDI) standard. At this time the propeller that is widely used is the B Series propeller including the propeller design used on mini LNG ships, namely the B6.40 propeller, the B Series propeller has a pitch character from the Wageningen Propeller Series study. Innovations are made to get better propeller efficiency by varying the pitch distribution. The B6.40 propeller of the standard constant pitch type was modified to B6.40 variable pitch (high thrust). Propellers with high thrust have better efficiency especially for non-fast boats. This study was conducted to obtain the best propeller efficiency of a constant pitch propeller and three high thrust propeller units using Numeca's Computational Fluid Dynamics (CFD) numerical self-propulsion test. For validation of the simulation program by comparing the results of the open water test B6.40 Wageningen while resistance validation by comparing the ship resistance model test. The results of the self-propulsion test using Disc Actuator show that the propulsion coefficient (PC) of Modified-2 and Modified-3 high thrust propellers is better when compared to constant pitch. The magnitude of the increase in PC value reaches ± 4% higher than the constant pitch type on the Modified-3 propeller.
Study of the Motion Performance of Marine Current Power Plant Turbine Floaters Due To Ocean Current Forces under Moored Conditions Kasharjanto, Afian; Erwandi, Erwandi; Marta, Eko; irawanto, Zulis; Rahuna, Daif; SJM, Cahyadi
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.58238

Abstract

Indonesia targets carbon emissions to reach 0% in 2060 and is replaced by optimizing the use of renewable energy sources. Indonesia as an archipelago country, with the potential of thousands of straits can be utilized as a source of ocean currents as a source of electrical energy. The electricity generated is obtained from a turbine rotor that rotates due to the force of the ocean current flow. To support the turbine rotor to move in the sea, a floating support structure is needed. In this study, a trimaran tipe support structure is used where on the left and right sides are installed 2 (pieces) turbine rotors @ 50 kW each, so that the total has a capability of 200 kW (@4 x 50 kW). The novelty of this study is the utilization of Trimaran technology in marine current power generation turbines, which has good stability, low resistance, and a wider deck area rather than monohull structures. A numerical study using Computational Fluid Dynamics (CFD) is used to calculate the program. The results showed that the floater only moves backward and then is pulled forward with a small amplitude of movement in the X-direction, while those on the Y and Z axes are insignificant. The turbine floater can be immediately stabilized and the turbine rotor will rotate due to the force of the ocean current received. Therefore, in this study, the marine current turbine using trimaran type is showing good ability to survive in Indonesian waters even in high current areas.
Deep learning-based prediction of float model performance in floatplanes: A case study on lift-to-drag coefficient ratio Fahmi, Faisal; Fajar, Rizqon; Atmaja, Sigit Tri; Erwandi, Erwandi; Rahuna, Daif
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.pp1969-1979

Abstract

Developing an engineering design is resource-intensive and time-consuming, particularly for the floats of a floatplane design, due to its complexity and limited testing facilities. Intelligent-based computational design (IBCD) techniques, which integrate computational design techniques and machine learning (ML) algorithms, offer a solution to reduce required testing by providing predictions. This paper proposes a deep learning (DL)-based IBCD method for modeling floats' lift-to-drag coefficient ratio (CL/CD), where DL is one of the most powerful ML. The proposed method consists of two phases: hyper-parameter optimization and DL model training and evaluation. A genetic algorithm (GA) is employed in the first phase to explore complex hyper-parameter combinations efficiently. Evaluation of the predicted CL/CD of the floats using the DL model resulted in a satisfactory R-squared of 0.9329 and the lowest mean squared error (MSE) of 0,001536. These results demonstrate the ability of DL model to predict the float's performance accurately and can facilitate further design optimization. Thus, the proposed method can offer a time-efficient and cost-effective solution for predicting float performance, aiding in optimizing floatplane designs and enhancing their functionalities.
Pemberdayaan kewirausahaan bidang gizi melalui pelatihan teknologi pengolahan produk hasil perikanan bagi mahasiswa dan alumni gizi Poltekkes Kemenkes Aceh Rachmawati, Rachmawati; Novita, Rosi; Erwandi, Erwandi; Iskandar, Iskandar
Jurnal PADE: Pengabdian & Edukasi Vol 5, No 1 (2023): Maret
Publisher : Politeknik Kesehatan Kemenkes Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30867/pade.v5i1.1093

Abstract

Kegiatan pemberdayaan kewirausahaan bidang pangan dan gizi melalui pelatihan teknologi pengolahan produk hasil perikanan selain dapat meningkatkan konsumsi ikan juga dapat meningkatkan peluang pengembangan kewirausahaan bidang pangan dan gizi dan sekaligus dapat meningkatkan perekonomian keluarga. Kegiatan Pengabdian kepada Masyarakat berupa kegiatan pemberdayaan kewirausahaan bidang pangan dan gizi melalui pelatihan teknologi pengolahan produk hasil perikanan dilaksanakan selama 2 (dua) hari yaitu pada tanggal  26-27 Juli 2022, dengan kelompok sasaran adalah alumni dan mahasiswa Jurusan Gizi Poltekkes Kemenkes Aceh sebanyak 21 orang.  Kegiatan dilaksanakan dengan metode ceramah, diskusi dan praktek pengolahan produk hasil perikanan di Laboratorium Gizi Kuliner Jurusan Gizi Poltekkes Kemenkes Aceh. Hasil kegiatan menunjukkan bahwa terjadi peningkatan pengetahuan dan ketrampilan peserta setelah mendapatkan materi  pengembangan kewirausahaan dan praktek pengolahan produk hasil perikanan.
Pengembangan Leaflet Pencegahan dan Pengendalian Overweight Sebagai Media Penyuluhan dalam Meningkatkan Pengetahuan Al Rahmad, Agus Hendra; Salsabila, Jeumpa Syahrana; Erwandi, Erwandi; Fadjri, T. Khairul
Jurnal Bahana Kesehatan Masyarakat (Bahana of Journal Public Health) Vol 8 No 2 (2024): Jurnal Bahana Kesehatan Masyarakat (Bahana of Journal Public Health)
Publisher : Poltekkes Kemenkes Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35910/jbkm.v8i2.745

Abstract

Background: A 2016 WHO report showed that over 340 million children and adolescents aged 5-19 years are obese. From 2000 to 2017, 38.3 million children worldwide were obese. This changed from 4.9% in 2000 to 5.6% in 2017 and more than 2 million children in Indonesia are overweight or obese. Methods: This type of research is quantitative, using a quasi-experimental design (pseudo-experiment) with a pretest and posttest design. The subjects were 35 female students of Al-Fityan IT High School. The research location will be implemented in Al-Fityan IT High School with a research plan in May 2023. Data collection included primary and secondary data that were processed through editing, coding, scoring, processing, and cleaning stages. Data analysis was performed using R-statistical software, including the T-dependent test with a 95% confidence level (α = 0.05). Results: The research data will be presented in tabular and textual form. Results: The mean knowledge of students before education was lower (12.42) than that after education (15.02). Statistical results showed that counseling using leaflets had an effect on changes in knowledge of overweight (p=0.000). Conclusion: Education through counseling using leaflet media on the prevention and control of overweight has an effect on increasing the knowledge of adolescents at IT Al-Fityan High School in Aceh Besar. Keywords: Overwewight Prevention, Overweight, Leaflet
Analysis of Marine Current Turbine Placement Location in Suramadu Bridge - Indonesia Mujahid, Ahmad Syafiul; Erwandi, Erwandi
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 60 No 1 (2018): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (880.491 KB) | DOI: 10.36842/jomase.v60i1.73

Abstract

Marine current turbine is a system of marine current power plant to produce renewable electrical energy derived from marine currents. After marine current turbine successfully tested in Larantuka Strait in 2010, then in 2015 marine curent turbine team from BPPH-BPPT has conducted a study for placement of marine current turbine test that located in Suramadu Bridge, Madura Strait, East Java, Indonesia. This study uses survey data technique by direct measurement; Type of survey that is conducted using sampling technique by sampling method: purposive sampling or judgemental sampling. the subject of sampling data is marine current velocity data and ocean depth data which is chosen by researcher in the waters around the pile 56 to pile 57 under Suramadu Bridge. Measurements were conducted using instruments measurement: portable sounder, flow meter, and GPS. The measurement showed average depth: 11.4 meters and average marine current velocity: 1.3 m/s. By using the Betz Law Equation then the largest electric power can be obtained: 4.507 kW that located at 4.5 meters from pile 56 location. The Computational Fluid Dynamics (CFD) simulation is conducted to obtain the position of marine current turbine placement in order that turbine blades can rotate at optimum marine current speed. The optimum placement result of marine current turbine is located at 6.3 meters from piles 56 to the center of turbine, and the furthest distance from pile 56 to the turbine blade is 8.1 meters.
Co-Authors A. Sulisetyono Sulisetyono Agus Hendra Al Rahmad Ainun Mardiah Aprina, Aprina Astuti, Titi Atmaja, Sigit Tri Berlian Arswendo Adietya Cut Aja Nuraskin Fadjri, T. Khairul Fahmi, Faisal I Made Ariana I. K. A. P. Utama Utama Indiaryanto, Mahendra Irawanto, Zulis Iskandar Iskandar Kasharjanto, Afian Marta, Eko Mintarso, Cahyadi Mujahid, Ahmad Syafiul Muryadin, Muryadin Nadhila, Yumni R. Hantoro Hantoro Rachmawati Rachmawati Rahayu, Eka Sri Rahuna, Daif Reca Reca Rizqon Fajar Rosi Novita, Rosi Salsabila, Jeumpa Syahrana Sandjaja, Irfan Eko Sanee, Aree SHODIQ, MUNAWAR SJM, Cahyadi Sutopo Purwono Fitri Suyanto, Eko Marta