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All Journal JURNAL RISET TEKNOLOGI KELAUTAN PINISI Discretion Review International Journal of Marine Engineering Innovation and Research Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Indonesian Journal of Maritime Technology or abbreviated (ISMATECH) Collaborate Daily Book Series
Wardina Suwedy
Politeknik Maritim AMI Makassar, Indonesia
Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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STUDI PENGARUH SUDUT PENYIMPANGAN HALUAN KAPAL LAYAR MOTOR TRADISIONAL DENGAN MODIFIKASI BULBOUS BOW Hasbullah, Mansyur; Rosmani, .; Suwedy, Wardina
JURNAL RISET TEKNOLOGI KELAUTAN Vol 11, No 1 (2013)
Publisher : Ikatan Sarjana Teknik Perkapalan UNHAS

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Abstract

Penelitian ini mengenai pengujian model kapal dengan modifikasi bulbous bow saat mengalami beberapa variasi sudut penyimpangan haluan, yaitu 3°, 6°, 9° dan 12° yang kemudian akan diperoleh perhitungan tahanan dan daya efektif kapal. Hasil perhitungan tahanan dan daya efektif kapal pada sudut penyimpangan 3°, 6°, 9° dan 12° yang diperoleh dengan menggunakan metode International Towing Tank Conference (ITTC) akan dibandingkan dengan hasil perhitungantahanan dan daya efektif kapal pada pengujian sebelumnya, yaitu kapal tanpa sudut penyimpangan haluan melalui pengujian model pada towing tank di laboratorium hidrodinamika. Nilai tahanan dan daya efektif kapal sangat jauh perbedaannya jika dibandingkan haluan kapal tanpa sudut penyimpangan, dalam kata lain haluan berada dalam posisi lurus dengan kapal yang mengalami sudut penyimpangan sebesar 3°. Pada setiap kenaikan sudut penyimpangan sebesar 3° akan mengalami perubahan tahanan kapal rata-rata sebesar 6,89% dan daya efektif kapal rata-rata sebesar 7,37%. Pada sudut penyimpangan 9° dan 12° tidak dapat mencapai kecepatan 10 knot pada pembebanan yang sama.
Numerical Investigation of the Laying of Airbag Arrangements on Launching Barges Alamsyah bin Muhammad Saleh; Christian Hendra Gonawan; Rodlian Jamal Ikhwani; Taufik Hidayat; Habibi Habibi; Wardina Suwedy
International Journal of Marine Engineering Innovation and Research Vol 8, No 2 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i2.16737

Abstract

Ship-launching technology is developing rapidly in an effort to reach a point of economic efficiency, time efficiency, security, and flexibility. On the one hand, risks to the process of launching ships using airbags are still present and can occur. Exploding airbags due to the inability to withstand the load has implications for structural damage. Excessive pressure on the airbags can cause structural deformation. This study aims to determine the effect of airbag pressure on the strength of the ship's structure. This study uses finite element-based software to analyze stresses and deformations in ship construction when interacting with airbags. From this study, it was found that the number of airbags used in the two-row layout and cross-over arrangement was 14, with the status of the airbags in terms of load distribution being safe (not broken). The maximum stress value obtained from the simulation on the two-row arrangement layout is 11.62 MPa when it is right in the frame and 9.83 MPa when it is between frames. As well as in the cross-over arrangement layout, the maximum stress is 20.24 MPa when in the frame and 13.84 MPa when in between frames. This phenomenon occurs because of the stress concentration in the frame.
The impact of social media on the development of student knowledge in Indonesia Fitriana Fitriana; Irin Ramdhani; Wardina Suwedy; Yan Hermansyah; Arif Fuddin Usman
PINISI Discretion Review Volume 7, Issue 1, September 2023
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26858/pdr.v7i1.58727

Abstract

In the digital era, social media's pervasive influence on various aspects of life has become a focal point of academic inquiry, particularly in Indonesia, where its usage among students has seen a significant surge. This study aims to explore the impact of social media on the development of student knowledge in Indonesia, utilizing a qualitative research approach to delve into nuanced perspectives and experiences. The methodology involves in-depth interviews and focus group discussions with students from diverse educational backgrounds across Indonesia, alongside content analysis of their social media interactions. The findings reveal a dual-edged nature of social media's impact: on one hand, it serves as a dynamic platform for information exchange and learning enhancement, offering students access to a plethora of educational resources and peer-support networks. On the other hand, it poses challenges such as misinformation, distraction, and cognitive overload, which can impede knowledge acquisition and critical thinking. The study underscores the need for a balanced approach in leveraging social media for educational purposes, advocating for digital literacy programs to equip students with skills to critically assess and effectively utilize online information for their academic and personal growth.
Testing of Carbon Steel Pipe and Stainless Steel Duplex Pipes of Welding Joints : A Cost and Time Perspective Alamsyah Alamsyah; Ryo Herlambang; Rodlian Jamal Ikhwani; Taufik Hidayat; Wardina Suwedy
Collaborate Engineering Daily Book Series Vol. 1 No. 1 June (2023): Chapter Improve Competence To Complete The Requirements For International
Publisher : Collaborate

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Abstract

In the welding process, it is not uncommon for a defect or discontinuity to occur in the welding results. Common defects on the surface are undercut, concavity, incomplete penetration, spatter, burn-through, and mismatch. While defects in internal welds that are often found during testing are porosity, worm holes, slag inclusions, incomplete fusion, and cracks, To obtain pipeline results that comply with the specifications set by the welding engineer and ASME or ASTM standards, it is necessary to test surface cracks and inside cracks using the non-destructive test (NDT) method, namely the dye penetrant test and radiography test, to determine the results of welding at pipe joints. In addition, it is also necessary to know the time and cost required for each method in the testing process. The results of the radiography test and penetrant test on carbon steel pipe welding joints showed porosity welding defects 1 mm long. Weld defects in duplex stainless steel pipes were not found. Then the results of the total testing time using the radiography test take 18% longer than testing using the penetrant test. Furthermore, the total costs that need to be incurred during the test are found to be 2~3 times more expensive than the cost of the penetrant test.
Rubber Tyred Gantry (RTG) Failure Analysis Using FMEA Method at PT. Kaltim Kariangau Terminal Balikpapan Fitriah, Rifkah; Andi Ningrat; Dwi Wahyuni Rahman; Andi Rachmianty AM; Muslihati; Wardina Suwedy
Indonesian Journal of Maritime Technology Vol. 2 No. 2 (2024): Volume 2 Issue 2, December 2024
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v2i2.1261

Abstract

Failure Mode and Effect Analysis (FMEA) is a method designed to evaluate system designs by identifying various failure modes of a system, which consists of multiple components, and analyzing their impacts on the system's reliability. The primary goal of FMEA is to identify and address key issues at every stage of the design and production process to prevent defective products from reaching customers, thereby safeguarding the company’s reputation. This study aims to identify the types of damage occurring in Kalmar-brand Rubber Tyred Gantry (RTG) equipment at PT. Kaltim Kariangau Terminal Balikpapan and analyze these failures using the FMEA method. Data collection was conducted through field observations, interviews, and documentation. The FMEA calculations also include repair recommendations for each identified failure. Based on the analysis, several failures were found to rank highest in severity for each piece of equipment. For RTG 07, the most critical failure was the "Trouble Hoist," requiring corrective actions such as repairs to the motor system, brakes, and gearbox.
Seakeeping Performance and Passenger Comfort Assessment of a 300 GT Ro-Ro Ferry Using RAO, MSI, and MII Analyses Wahidah, Jusma; Ariani, Vidya Rezeki; Alamsyah; Wulandari, Amalia Ika; Suwedy, Wardina; Sitorus, Chris Jeremy Verian; Hariyono; Kustiwansa, Harlian; Agusty, Cindy Lionita; Syam, Muhammad Anjas
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 6, Number 3, November 2025 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

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Abstract

This study examines the motion response and onboard comfort of a Ro-Ro ferry under varying wave directions and speeds using the Response Amplitude Operator (RAO), Motion Sickness Incidence (MSI), and motion-induced interruptions (MII) as evaluation parameters. Simulations were conducted using Maxsurf Motion software with wave heights of 3 m and 3.5 m and encounter angles of 0° (following seas), 90° (beam seas), and 180° (head seas) at vessel speeds of 0 and 12 knots. The MSI was assessed using both simulation results and empirical calculations, whereas the MII was evaluated according to the ISO 2631 standards at three onboard locations: the passenger, navigation, and vehicle decks. The RAO results indicate that the vessel met the NORDFORSK (1987) motion criteria under following and head seas but exceeded the roll limits in beam seas. The MSI values remained within the moderate comfort range, except under head seas at 12 kn, where the values approached the alert thresholds. The MII remained within acceptable levels under most conditions, although probable interruption levels were observed on the passenger and vehicle decks during beam sea conditions. Overall, the findings emphasize that wave direction and vessel speed significantly influence motion-induced discomfort and operational performance, underscoring the importance of optimizing route planning and speed to improve passenger safety and seakeeping performance on roll-on/roll-off ferries.
Co-Authors . Rosmani Agusty, Cindy Lionita Alamsyah Alamsyah Andi Ningrat Andi Rachmianty AM Ariani, Vidya Rezeki Arif Fuddin Usman Christian Hendra Gonawan Dwi Wahyuni Rahman Fitriah, Rifkah Fitriana Fitriana Habibi Habibi Hariyono, Hariyono Irin Ramdhani Kustiwansa, Harlian Mansyur Hasbullah Muslihati Rodlian Jamal Ikhwani Rodlian Jamal Ikhwani Ryo Herlambang Sitorus, Chris Jeremy Verian Syam, Muhammad Anjas Taufik Hidayat Wahidah, Jusma wulandari, amalia ika Yan Hermansyah