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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan International Journal of Renewable Energy Development
Muhammad Iqbal
Department of Naval Architecture, Diponegoro University
Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering

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Experimental Studies of Interaction Forces Affect the Position of Vertical Plates on Oscillating Heave Plates with Cylindrical Bodies in Regular Waves Eko Sasmito Hadi; Muhammad Iqbal; Ari Wibawa; Ojo Kurdi; Karnoto Karnoto
International Journal of Renewable Energy Development Vol 9, No 1 (2020): February 2020
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.9.1.77-84

Abstract

This paper discusses an experimental study of a wave energy converter (WEC) without using reaction from the seabed. The WEC uses buoys and heave plates, which can react to their self-reacting. The interaction force between heave plates and buoys can absorb energy from ocean waves better. The heave plate model affects the output of energy produced. It is presented in this study with variations in the position of upright plates. The research aims to measure the influence of the place of the addition of vertical plates into heave plates on the WEC on the hydrodynamic performance (coefficient of mass increase, drag coefficient, and KC value) and the interaction of the force it produces with the buoy on regular waves. The conclusion is the vertical plate position makes the coefficient of mass added Ca increase with an increasing amount of KC, and an almost linear relationship was observed between them. As the frequency increases, the value of C increases slightly, but it is not clear. Thus, the oscillating frequency has little effect on the mass coefficient of added heave plates with vertical plates. Thus, the change in the vertical plate position has only a powerful effect on KC < 0.75. ©2020. CBIORE-IJRED. All rights reserved
Ship Hull Geometry Design by Using B-Spline Curve Fitting and Lofted Surface Generation Sheely Leony Artha Pasaribu; Berlian Arswendo Adietya; Muhammad Iqbal; Hasanudin Hasanudin; Wiwin Sulistyawati; Mohammad Sholikhan Arif; Ardi Nugroho Yulianto
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 23, No 2 (2026): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v23i2.84399

Abstract

As one of the largest archipelago countries in the world, Indonesia requires technological capability to independently develop efficient ship design systems. Currently, the Computer-Aided Design (CAD) software used for domestic ship design is still largely dominated by foreign commercial products, which require costly subscription fees. This dependence limits the technological independence of the national shipbuilding industry. This study aims to develop a simple CAD-based program for representing ship hull geometry using a parametric mathematical approach. The program reconstructs sectional curves using mathematics formulations and generates a continuous three-dimensional hull surface through a lofting method based on equal arc-length discretization and triangular mesh representation. The research methodology includes system design, curve and surface generation, geometric visualization, and validation through comparison with results obtained from commercial CAD software. The results demonstrate that the developed system is capable of accurately reconstructing sectional curves and generating a consistent lofted hull surface suitable for representing simple ship hull forms. This work provides an initial step toward the development of domestic ship hull design tools to support preliminary geometric modeling in Indonesia’s maritime industry.
Co-Authors Ardi Nugroho Yulianto Ari Wibawa Berlian Arswendo Adietya Eko Sasmito Hadi Hasanudin Hasanudin Karnoto Karnoto Mohammad Sholikhan Arif Ojo Kurdi Sheely Leony Artha Pasaribu Wiwin Sulistyawati