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All Journal International Journal of Marine Engineering Innovation and Research Sewagati
Intan Rahmahwati
Politeknik Perkapalan Negeri Surabaya
Arts Humanities Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Mathematical Modelling of Longitudinal Vibration on Propulsion System 5200 DWT General Cargo Ship Benedicta Dian Alfanda; Adi Wirawan Husodo; Intan Rahmahwati; Febry Yulistiawan
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 1 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i1.4763

Abstract

The vibration level of the propulsion system will change during its operation. This vibration is caused by harmonic excitation forces produced by the rotation of the main engine and propeller shaft. Ship propulsion systems experience longitudinal, torsional and lateral vibrations. Excessive vibration will produce noise and reduce engine performance. Vibrations can also cause resonance in the system, which can be fatal and damage the structure. The excitation frequency value is close to or equal to the natural system frequency, which causes resonance. This paper has identified the vibration response of the propulsion system by using numerical software through mathematical modelling governed by ABS. In addition, the total vibration response was obtained using the modal analysis method by summing up the contributions of each mode. The excitation source generated is due to the rotation of the main engine. Ultimately, the response obtained will be adjusted to the standard class. The modelling results obtained a 3-Degree-of-Freedom forced vibration model consisting of three masses and three springs. The resulting response values are displacement and velocity, where the highest response occurs at 347 rpm with a deviation of ±0.1345 mm to ±0.3371 mm and a velocity value of ±4.8847 mm/s to ±12.2424 mm/s. The slightest response occurs at 459 rpm with a deviation range of ±0.0034 mm to ±0.0050 mm and velocity values of ±0.1634 mm/s to ±0.2382 mm/s. Based on all the results of adjusting the vibration response value with the ABS class vibration limit graph, the vibration is still below the permissible threshold line.
Model Kolaborasi Pendidikan Dan Industri Dalam Pelatihan Welding Inspector Di Politeknik Perkapalan Negeri Surabaya: Strategi Peningkatan Kompetensi Sumber Daya Manusia Muhammad Fiky Izzulhaq; Lilik Khoiriyah; Muhammad Ali Reza; Chezta Ahmad Muzakky; Alif Nur Rochmad; Intan Rahmahwati; Vena Rizky Pusparani; M Rizqi Mubarok
Sewagati Vol 10 No 4 (2026)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v10i4.9688

Abstract

The Politeknik Perkapalan Negeri Surabaya (PPNS), through its Welding Engineering Study Program, organized a Welding Inspector Training program certified by the Badan Nasional Sertifikasi Profesi (BNSP). This initiative represents a strategic effort to enhance the quality of human resources in the maritime industry through a vocational education–industry link and match model. The program is open to students, alumni, and industry professionals to meet the growing demand for nationally and globally certified personnel. The training was conducted collaboratively by PPNS and the Professional Certification Institute (LSP) PPNS, employing a Competency-Based Training (CBT) approach that integrates intensive theoretical instruction, laboratory practice, industry mentoring, and a final competency assessment. With a total duration of 328 hours, participants were trained in visual inspection, non-destructive testing (NDT), and welding metallurgy analysis. The results indicate a 100% pass rate, underscoring the effectiveness of this collaborative model in meeting BNSP certification standards. Furthermore, the program strengthens the tripartite relationship among educational institutions, industry, and certification bodies, while also serving as a best practice for implementing TVET 4.0 and the Link and Match 8+i Framework in vocational education in Indonesia.
Co-Authors Adi Wirawan Husodo Alfanda, Benedicta Dian Alif Nur Rochmad Chezta Ahmad Muzakky Febry Yulistiawan Lilik Khoiriyah M Rizqi Mubarok Muhammad Ali Reza Muhammad Fiky Izzulhaq Vena Rizky Pusparani