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Analisis Tegangan pada Belokan Pipa Marine Boil Off Gas (MaBOG) Berbasis Metode Elemen Hingga Rudi Kurniawan; Arhami Arhami; Rahmatsyah Maksum Ramsi
Jurnal Teknik Mesin Unsyiah Vol 6, No 2 (2018)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jtm.v6i2.18231

This paper discusses the stress analysis of marine boil off gas pipe elbow. The piping system receives several loading conditions such as expansion load, occasional load, operation load, and sustain load, which are referred to as static loading conditions. As a result of the load conditions can be known stress distribution and examine the strength of the weld connection on the pipe elbow. The purpose of this research is to know the distribution of stress at the elbow of the pipe due to static loading conditions. The method used in this study using finite element analysis. The result of stress simulation in pipe elbow is 771 Pa and the result of calculation of stress in pipe elbow is 3,94 Pa. The result of piping system simulation shows the value of the pipe elbow e due to the load operation of 23151,34 kPa, the sustain load is 24918,91 kPa, the occasional load is 59110,83 and the expansion load does not produce the stress value. From the results of the analysis, the stress due to operating, sustain, and expansion loads are categorized as safe because they do not exceed the allowable stress values of each loading condition.

The Analysis of Loosening of Bolt Connection Due to Structural Vibration Through Changes in Dynamic Characteristics Rahmatsyah Maksum Ramsi; Meifal Rusli; Mulyadi Bur
Jurnal Teknik Mesin Vol 16 No 1 (2023): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.16.1.1091

Bolted joints are generally used to connect two or more mechanical structures due to their ease of assembly and disassembly for maintenance. However, the problem of vibration is one of the main challenges when the tightness of the bolted joints is insufficient, causing failures such as looseness and resulting in disconnection. Looseness is the most common cause of dynamically loaded bolted joint structure failure. This study tested a simple bolt joint structure to observe the looseness indication of the bolt joint after it was vibrated using a shaker in a single-frequency excitation. A freely fixed beam consisting of two beams connected by a bolt and subjected to varying bolt tightening torques. Then the response measurement is carried out by recording the FRF graph obtained from loosening and tightening bolt torque effects. Modal parameters such as personal frequency and damping ratio were collected through experimental modal analysis (EMA). It was found that the structure’s vibration could change the conditions of loosening or lower tightening torque indicated by shifting the structure’s natural frequency. In addition, the damping characteristics are also affected by changes in the tightening torque. Especially when conditions are loose, the damping ratio becomes much higher than that of tightening.

Rancang Bangun Sistem Kemudi Mobil Hemat Energi Kategori Urban Konsep Bahan Bakar Etanol Japri, Japri; Ridha Fauzi, Muhammad; Denur, Denur; Derisman, Aken; Arya Gunawan, Roni; Hanindya Edwiyan Pradana, Defris; Maksum Ramsi, Rahmatsyah; Nugroho Aji, Hanif
SURYA TEKNIKA Vol 12 No 2 (2025): JURNAL SURYA TEKNIKA
Publisher : Fakultas Teknik UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jst.v12i2.10693

Penelitian ini bertujuan merancang dan menguji sistem kemudi mobil hemat energi berbasis etanol yang ergonomis, ringan, dan efisien untuk kompetisi. Sistem kemudi dirancang berdasarkan prinsip geometri Ackermann dengan menggunakan aplikasi SolidWorks, perhitungan teoritis radius putar 5,11 meter, sudut belok roda bagian dalam 17,7°, dan roda bagian luar 14,7°. Hasil pengujian lapangan menunjukkan radius putar aktual sebesar 5,34 meter (kanan) dan 5,35 meter (kiri), masih berada di bawah batas maksimal 6 meter sesuai regulasi. Sudut belok roda depan terukur mencapai 18° (dalam) dan 14,5° (luar), sesuai dengan prinsip Ackermann yang menjamin efisiensi belok. Sistem terbukti responsif, ringan dalam pengoperasian, minim getaran, dan mampu menahan beban dinamis secara optimal. Hasil penelitian menunjukkan bahwa desain kemudi yang terintegrasi dengan prinsip ergonomi dan efisiensi energi secara keseluruhan memenuhi standar kompetisi, menawarkan performa yang andal dan nyaman. Temuan ini dapat menjadi acuan dalam pengembangan kendaraan hemat energi berbasis etanol untuk kebutuhan kompetitif di masa depan.

Analysis of bolted joint loosening due to structural vibrations using short-time fourier transform and wavelet transform Ramsi, Rahmatsyah Maksum
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/3wteep54

This research investigates the influence of bolt loosening on the dynamic behavior of a steel beam structure under continuous vibration excitation for 30 minutes. Bolted joints play a critical role in maintaining structural integrity; however, loosening caused by vibration remains one of the most common failure mechanisms in mechanical structures. To capture the effect of bolt loosening, acceleration responses were analyzed using time-domain inspection, Fast Fourier Transform (FFT), Short-Time Fourier Transform (STFT), and Continuous Wavelet Transform (CWT). The experimental setup involved controlled vibration excitation applied to a steel beam with bolted connections, and response signals were recorded at different stages of loosening progression. The time-domain analysis showed a gradual reduction in acceleration amplitude as bolt tightness decreased, indicating energy dissipation and stiffness loss. FFT provided an overview of frequency content but lacked sensitivity to localized variations. STFT and CWT enabled a more detailed examination of the time-frequency domain, revealing a loss of high-frequency components and significant redistribution of energy patterns during the loosening process. Both methods successfully identified shifts in natural frequencies and variations in response amplitude. Especially, CWT exhibited superior resolution in detecting early-stage loosening compared to STFT, making it more effective for practical monitoring applications. These results highlight the potential of time-frequency analysis as a diagnostic tool for vibration-based Structural Health Monitoring (SHM) systems. Early detection of bolt loosening through non-destructive vibration analysis can improve safety, reduce maintenance costs, and extend the service life of mechanical structures.

Pemberdayaan Kelompok Tani ‘Qila Tani’ melalui Hibah Trolley Sprayer Pestisida di Kabupaten Kampar Rahmatsyah Maksum Ramsi; Fransiskus Faisal Simatupang; Mintarto Mintarto; Brian Agung Cahyo P; Jheri Hermanto; Ari Andriyas Puji; Hanif Nugroho Aji; Musthafa Akbar; Dedi Rosa Putra Cupu; Nazaruddin Nazaruddin; Yohanes Yohanes; Asral Asral; Warman Fatra; Azridjal Aziz; Efi Afrizal; Sunny Ineza Putri; Syafrinaldi Zuhrimansyah
Jurnal Pengabdian Kompetitif Vol. 5 No. 1 (2026): Jurnal Pengabdian Kompetitif (JPK)
Publisher : Komunitas Manajemen Kompetitif

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35446/pengabdiankompetif.v5i1.2888

Kegiatan pengabdian masyarakat ini bertujuan untuk memberdayakan Kelompok Tani "Qila Tani" di Desa Karya Indah, Kampar, melalui implementasi teknologi tepat guna berupa trolley sprayer pestisida mekanis. Program dilatarbelakangi oleh rendahnya efisiensi kerja penggunaan knapsack sprayer manual 16 liter, yang menyebabkan tingginya beban fisik dan lambatnya pengendalian hama. Metode pelaksanaan meliputi identifikasi masalah, pelatihan teknis operasional dan perawatan (SOP), serta hibah alat. Pelatihan diikuti secara intensif oleh 7 orang peserta, mewakili 70% dari total anggota kelompok tani. Hasil evaluasi kuantitatif menunjukkan keberhasilan program yang signifikan dalam peningkatan kapasitas Sumber Daya Manusia (SDM). Rata-rata global kompetensi peserta meningkat sebesar 72%. Lonjakan tertinggi terjadi pada keterampilan operasional alat sebesar 92%, diikuti peningkatan pemahaman perawatan dan SOP sebesar 74%, serta prinsip kerja mesin sebesar 53%. Selain itu, secara teknis tercatat peningkatan kapasitas angkut pestisida hingga 70 liter dan percepatan waktu penyemprotan. Kesimpulannya, adopsi trolley sprayer terbukti efektif meningkatkan kompetensi SDM petani, menghilangkan beban kerja fisik, dan mempercepat transisi mekanisasi pertanian untuk mendukung produktivitas di Desa Karya Indah.

Residential AC Technician Competency Training and Certification (Level 3) in Pekanbaru Brian Agung Cahyo P.; Sunny Ineza Putri; Jheri Hermanto; Anita Susilawati; Dedy Masnur; Dodi Sofyan Arief; Putri Nawangsari; Annisa Wulan Sari; Mintarto .; Hanif Nugroho Aji; Rahmatsyah Maksum Ramsi
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 9 No 1 (2026): Environmental-based Awareness for Agile Community Strength
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v9i1.687

This Community Service Activity by the Mechanical Engineering Department of Riau University was a strategic move to address the urgent need for the formalization and quality improvement of Air Conditioner (AC) technicians. The program was based on the official appointment of Mechanical Engineering Unri as a Temporary Competency Test Center by a credible Professional Certification Body (LSP), affirming the institution's role in implementing the National Work Competency Standards (SKKNI). Targeting technicians with a minimum of one year of experience, the program had a dual objective: validating the existing practical skills while enhancing knowledge on crucial aspects like Occupational Health and Safety (K3) and environmentally compliant refrigerant handling. The PKM was implemented through structured stages, commencing with strict recruitment and selection, followed by comprehensive training delivered by Unri's competent lecturers, focusing on core competency units. The culmination was the Competency Test, conducted independently by certified Assessors from the partner LSP at the Unri TUK. The assessors evaluated participants' knowledge, skills, and work attitude through written, oral, and practical examinations. The main outcome of this activity was the successful certification of professional technicians. A total of 10 (ten) AC technicians were declared Competent and officially received the AC Technician Professional Competency Certificate from BNSP. This achievement significantly contributes to upgrading the quality and competitiveness of the local workforce, boosting professionalism, service quality, and career prospects for the certified technicians.

Analysis of the Effect of Cutting Depth in the Thread-Making Process on Fatigue Testing Using a CNC Gedee Weiler Learn Turn Mhd Bagas Alfian Rizky; Aljufri Aljufri; Suryadi; Muhammad Nuzan Rizki; Ferri Safriwardy; Rahmatsyah Maksum Ramsi
Malikussaleh Journal of Mechanical Science and Technology Vol. 10 No. 1 (2026): Malikussaleh Journal of Mechanical Science and Technology (MJMST)
Publisher : E-Journal Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/mjmst.v10i1.28687

A thread is an essential element of a bolt that functions as both a fastener and a force-transmitting component, and therefore must be able to withstand both static and dynamic loads. In practical applications, threads are frequently subjected to repeated loading, which can potentially lead to failure due to material fatigue. This study aims to analyze the effect of thread depth variation on the fatigue resistance of AISI 1045 steel processed using a CNC Gedee Weiler Learn Turn machine. The thread depth variations used were 0.4 mm, 0.6 mm, and 0.8 mm. The testing method was carried out using a rotary bending fatigue machine until the specimen fractured, after which the number of cycles to failure and the resulting bending stress were calculated. The test results show that the greater the thread depth, the higher the bending stress experienced by the specimen, namely 227.7 MPa at a depth of 0.4 mm, 253.8 MPa at a depth of 0.6 mm, and 284.3 MPa at a depth of 0.8 mm. However, an increase in thread depth resulted in a decrease in the number of cycles to failure. The specimen with a 0.4 mm thread depth exhibited the most optimal and highest fatigue life value, at 5,127.54 cycles, whereas the specimen with a 0.8 mm thread depth achieved the most optimal fatigue life of only 2,603.04 cycles. These findings indicate that a shallower thread depth provides better fatigue resistance in AISI 1045 steel.

Bolted Joint Loosening Analysis Due to Structural Vibrations using Short-Time Fourier Transform and Wavelet Transform Rahmatsyah Maksum Ramsi; Meifal Rusli; Feblil Huda
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.2.130-138.2025

This research investigates the influence of bolt loosening on the dynamic behavior of a steel beam structure under continuous vibration excitation for 30 minutes. Bolted joints play a critical role in maintaining structural integrity; however, loosening caused by vibration remains one of the most common failure mechanisms in mechanical structures. To capture the effect of bolt loosening, acceleration responses were analyzed using time-domain inspection, Fast Fourier Transform (FFT), Short-Time Fourier Transform (STFT), and Continuous Wavelet Transform (CWT). The experimental setup involved controlled vibration excitation applied to a steel beam with bolted connections, and response signals were recorded at different stages of loosening progression. The time-domain analysis showed a gradual reduction in acceleration amplitude as bolt tightness decreased, indicating energy dissipation and stiffness loss. FFT provided an overview of frequency content but lacked sensitivity to localized variations. STFT and CWT enabled a more detailed examination of the time-frequency domain, revealing a loss of high-frequency components and significant redistribution of energy patterns during the loosening process. Both methods successfully identified shifts in natural frequencies and variations in response amplitude. Especially, CWT exhibited superior resolution in detecting early-stage loosening compared to STFT, making it more effective for practical monitoring applications. These results highlight the potential of time-frequency analysis as a diagnostic tool for vibration-based Structural Health Monitoring (SHM) systems. Early detection of bolt loosening through non-destructive vibration analysis can improve safety, reduce maintenance costs, and extend the service life of mechanical structures.

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