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All Journal Jurnal Teknik Mesin JURNAL MATEMATIKA STATISTIKA DAN KOMPUTASI Prosiding Seminar Nasional Sains dan Teknologi Terapan Mekanika: Majalah Ilmiah Mekanika Jurnal Pengabdian, Pendidikan dan Teknologi Pilar Teknologi : Jurnal Penelitian Ilmu-ilmu Teknik Journal of Railway Transportation and Technology Journal Serambi Engineering (JSE)
Sudarno Sudarno
Universitas Merdeka Madiun
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Transportation Other

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Numerical Analysis of Openings in Stiffeners under Impact Loading: Investigating Structural Response and Failure Behavior Ridwan Ridwan; Sudarno Sudarno; Haris Nubli; Achmad Chasan; Iwan Istanto; Pandu Sandi Pratama
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 2 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i2.76774

Abstract

As the demand for lightweight ships continues to rise, there is a growing necessity to explore innovative methods that can reduce the weight of ship structures without altering the materials used. This research addresses this challenge by investigating the effect of opening in stiffener under impact loading. The research aims to provide valuable insights into optimizing weight reduction strategies while ensuring the ship's overall strength and performance remain uncompromised. To achieve this goal, the study employed the finite element method as a solver. By simulating impact scenarios and analyzing stiffener responses, the numerical analysis quantified the structural behavior and failure modes. The focus was on understanding the impact of openings on the structural integrity and how it relates to their positioning relative to the impact point. The results of the study indicate that opening slightly distant from the impact point exhibit greater strength, showcasing a counterintuitive relationship between opening placement and structural response.
Failure Criteria in Crashworthiness Analysis of Ship Collision and Grounding Using FEA: Milestone and Development Hermes Carvalho; Ridwan Ridwan; Sudarno Sudarno; Aditya Rio Prabowo; Dong Myung Bae; Nurul Huda
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 1 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i1.70959

Abstract

This study presents reviews of the failure criteria to capture the resulting response due to the catastrophe of ship collision and grounding using the finite element. Researchers have introduced several failure criteria, for instance, the Det Norske Veritas (DNV) RP-C204 criterion, Germanischer Lloyd criterion, Peschmann, Rice-Tracey and Cockcroft-Latham (RTCL), Bressan-Williams-Hill (BWH) instability criterion, and Liu criterion. As in the mathematical formula, each criterion has a difference. The choice of failure criteria will depend on the simulation's specific requirements and the analysis's goals. Liu's criterion can be used to evaluate the failure of materials in ship collision simulations, for example, when large element sizes (i.e., 20 mm) are considered in the simulation.
Analisis Sifat Kuat Tarik Komposit Serat Kulit Kayu Waru dan Fiber Glass Bermatrik Polyester Sutrisno; Zaidan Ridho Azzamul Aziz; Sudarno
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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

Abstract

Pemanfaatan serat alam dalam pengembangan material komposit terus mengalami perkembangan signifikan sebagai alternatif pengganti serat sintetis. Serat kulit kayu waru (Hibiscus tiliaceus) merupakan salah satu serat alam yang keberadaannya melimpah di Indonesia, namun pemanfaatannya masih terbatas pada industri kerajinan tangan dan pembuatan tali. Penelitian ini bertujuan untuk menganalisis kontribusi serat kulit kayu waru dan fiberglass terhadap sifat mekanik material komposit, khususnya kekuatan tarik. Metode penelitian menggunakan variasi fraksi volume serat kulit kayu waru (0%–20%) dan fiberglass (20%–0%) dengan komposisi matriks resin poliester konstan sebesar 80%. Spesimen uji dibuat menggunakan metode hand lay-up dan diuji mengikuti standar ASTM D 638-01. Hasil pengujian menunjukkan bahwa kekuatan tarik tertinggi diperoleh pada variasi A (20% fiberglass, 0% serat waru) sebesar 135,25 MPa, sedangkan kekuatan tarik terendah ditemukan pada variasi E (0% fiberglass, 20% serat waru) sebesar 30,03 MPa. Meskipun kekuatan tarik serat kulit kayu waru belum setara dengan fiberglass, hasil penelitian menunjukkan bahwa serat kulit kayu waru memiliki potensi yang baik sebagai material penguat alternatif dalam aplikasi komposit dengan beban rendah hingga sedang, sekaligus mendukung pengembangan material ramah lingkungan dan berkelanjutan.
Traffic Lights for a Five-Arm Intersection Using Petri Net Models Tomi Tristono; Setiyo Daru Cahyono; Sukadi Sukadi; Joko Triono; Seno Aji; Sudarno Sudarno; Mochamad Sidqon
Jurnal Matematika, Statistika dan Komputasi Vol. 22 No. 3 (2026): May 2026
Publisher : Department of Mathematics, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/j.v22i3.49752

Abstract

This study aims to examine the traffic light model for a five-arm intersection. Two types of traffic light models were studied, namely the standard type and the modified Norwegian type. Traffic lights have a fixed phase scheduling sequence. The traffic light modeling method uses Petri nets to graphically represent the behavioral structure of mathematical modeling symbols in distributed discrete systems. The results of the study show that the Occurrence Graph of the standard traffic light and the modified Norwegian traffic light meet the Coverability Tree requirements for all possible finite states. The Coverability Tree method also includes the properties of boundedness and conservation, along with all transition sequences that fire. The Petri net model satisfies the live property because it never enters a deadlock or a state where no transition can fire. The Petri net model has also satisfied the Invariants property, which represents signal behavior that does not change over time. The Petri net model is declared correct and valid because it satisfies all required properties. The model can present the structure of traffic light behavior at a five-arm intersection.
Co-Authors Achmad Chasan Aditya Rio Prabowo Agustinus Sujono Anggi Vandika Asep Priyanto Bagos Aji Saputra Dandun Mahesa Prabowoputra Dian Kusuma Dong Myung Bae Dwi Aris Himawanto Hantarum Hantarum Haris Nubli Hermes Carvalho Hery Hermawan Iwan Istanto Joko Triono Koharudin Koharudin meirza aulia chairani Mochamad Sidqon Muhammad Hasan Basri Mustafa Mustafa Mustafa Mustafa Mustafa Mustafa Nur Candra Dana Agusti Nurul Huda Pandu Sandi Pratama Prastiyo Nugroho Putro adi luhung Quang Thang Do R. Ridwan Seno Aji Setiyo Daru Cahyono Sukadi Sukadi Sutrisno Tomi Tristono Wahidin Nuriana Zaidan Ridho Azzamul Aziz