Article Per Year (5 Year)
p-Index From 2020 - 2025
0.817
P-Index
This Author published in this journals
All Journal TEKNIK Rekayasa Mesin JRST (Jurnal Riset Sains dan Teknologi) PESHUM
Firdhaus, Ahmad
Unknown Affiliation
Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Mechanical Engineering Social Sciences

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
Analisis Pengaruh Multiple Repair Welding terhadap Kekuatan dan Microstructure pada Sambungan Pengelasan Baja JIS - G3101 Kiryanto, Kiryanto; Firdhaus, Ahmad; Laksana, Tri
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 1 Maret 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i1.21921

Abstract

Dalam industri manufaktur, proses perbaikan las yang dilakukan lebih dari satu kali (multiple repair gouging) seringkali digunakan untuk memperbaiki sambungan las yang cacat, namun proses pengelasan yang berulang dapat mengubah sifat material. Penelitian ini menggunakan sampel baja JIS - G3101 yang diperbaiki dengan variasi multiple repair gouging, diikuti dengan pengujian kekuatan tarik, kekerasan, dan analisis struktur mikro menggunakan mikroskop elektron pemindai (SEM). Hasil penelitian menunjukkan bahwa multiple repair welding mempengaruhi kekuatan tarik dan kekerasan pada sambungan las, yang tergantung pada jumlah dan kondisi pengelasan ulang. Struktur mikro juga mengalami perubahan, dengan terbentuknya fasa martensite pada zona HAZ (Heat Affected Zone) pada setiap lapisan perbaikan las. Meskipun perbaikan las dapat meningkatkan ketahanan sambungan terhadap kegagalan, hasil yang optimal dicapai dengan pengaturan prosedur pengelasan yang tepat.
Design of a Glass Bottom Catamaran as a Tourist Attraction on Aceh's Banyak Island Chrismianto, Deddy; Firdhaus, Ahmad; Al Muhshi, Hassan; Kiryanto, Kiryanto
TEKNIK Vol 45, No 3 (2024): December 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i3.60019

Abstract

Aceh's Banyak Island Due to its large water areas and fascinating islands that retain the grandeur of its sea and beaches, Singkil has risen as a new star in the world of tourism. Nonetheless, traditional fishing boats remain the principal mode of transportation for visitors in the region. The Glass Bottom Catamaran has been launched as a novel and attractive approach to admire the natural beauty of the seas around Banyak Island to capitalize on Indonesia's maritime tourist potential. The design process for this vessel involves basic linear regression calculations, the formulation of the ship's lines plan, the design of the vessel's General Arrangement, and the creation of a 3D model utilizing software. Stability calculations follow IMO standards, resistance calculations follow the Slender Body approach, and motion analysis follows Nordfork 1987 norms. As a result, the vessel's primary dimensions are as follows: LOA = 20.25 m, B = 7.04 m, B1 = 1.8 m, H = 2.4 m, T = 1.55 m, Vs = 17 knots, and a total passenger capacity of 54 people. In this investigation, the resistance value is 42.3 kN, concerning its ability to transport 60 tons at 17 knots. The stability study fulfils IMO guidelines, while the motion analysis meets Nordfork 1987 norms
The Role of Cooperative Learning in Undergraduate Engineering Education: A Better Alternative to Teacher-Centered Learning Firdhaus, Ahmad; Hakim, Muhammad Luqman; Tuswan, Tuswan; Mursid, Ocid
PESHUM : Jurnal Pendidikan, Sosial dan Humaniora Vol. 4 No. 4: Juni 2025
Publisher : CV. Ulil Albab Corp

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56799/peshum.v4i4.9362

Abstract

This comprehensive analysis examines the effectiveness of cooperative learning (CL) in undergraduate engineering education, contrasting it with traditional teacher-centered methods. The study finds that CL enhances academic performance and develops essential skills such as critical thinking, teamwork, and communication. Unlike passive teacher-centered methods, CL promotes active participation and collaborative problem-solving, better aligning educational outcomes with the demands of the engineering profession. The article highlights the limitations of teacher-centered learning, which often fails to foster deep understanding or student engagement. CL, involving students in diverse, role-defined groups, helps them connect theory to practice, particularly benefiting first-year students transitioning into collaborative environments. However, challenges to implementing CL include student resistance, higher instructor workload, and the need for effective group management. The study stresses the importance of faculty training, discipline-specific resources, and structured support to address these obstacles. Ultimately, the article advocates for a shift toward CL in engineering education, emphasizing its potential to prepare students for collaborative, dynamic engineering roles in a technologically advanced world.
IMO-COMPLIANT ANALYSIS OF THE LARGE ANGLE STABILITY OF CHEMICAL TANKERS DURING THE LOADING AND UNLOADING LIQUID CAUSTIC SODA Firdhaus, Ahmad; Pujo, Mulyatno Imam; Luqman, Hakim Muhammad; Sekar, Wangi Nimas Ayu
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1409

Abstract

MT. Sinar Masela 8831 DWT is a ship transporting oil and chemicals certified by IMO Chemical Class 2,3. According to Chapter B, SOLAS CHAPTER VII, regarding water safety, loading and unloading oil and chemicals is categorized as dangerous due to water damage and pollution. Various studies are needed to expedite the loading and unloading process to reduce damage and pollution in the waters. One of these studies is regarding the stability of ships in accordance with IMO criteria. The study was conducted to determine the ship stability on the MT. Sinar Masela is in the loading-unloading process. This study applies eight conditions with seven-compartment tanks on the ship using software to analyze the stability calculation when the loading-unloading process meets the stability criteria set by IMO A.749(18) Ch 3. The results show the measure of stability in eight conditions with a seven-compartment tank during the loading and unloading process has a higher GZ value in all states, which has met the IMO stability criteria. Comparison of stability calculations on loading and unloading has an average difference of 0.226 m at 2.075 deg at the GZ value in each condition.
Co-Authors Al Muhshi, Hassan Deddy Chrismianto Kiryanto Kiryanto Laksana, Tri Luqman, Hakim Muhammad Muhammad Luqman Hakim, Muhammad Luqman Ocid Mursid Pujo, Mulyatno Imam Sekar, Wangi Nimas Ayu Tuswan Tuswan