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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Teknik Mesin
Dinata, Ragil Alvin
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Automotive Engineering Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Jenis Biomassa dalam Proses Karbonisasi terhadap Efisiensi Burner Tipe GT40 Prayitno, Hadi; Dinata, Ragil Alvin; Amrul, Amrul; Kurniawan, Dondi; Nazarudin, Rizal; Saputra, Eko Wahyu
Jurnal Teknik Mesin Vol 17 No 2 (2024): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.17.2.1406

Abstract

The use of biochar as an organic fertilizer has gained significant attention in the agricultural field. Biochar application can enhance soil fertility and promote agricultural sustainability. Converting agricultural waste into biochar can reduce dependency on chemical fertilizers. Incorporating biochar into the soil improves water retention and nutrient availability. This study aims to evaluate the effect of biomass types (bromelain and bamboo) during the carbonization process on burner efficiency in biochar production.The study utilized bromelain biomass, bamboo biomass, and a mixture of the two at a 50% bromelain and 50% bamboo ratio. The raw materials were carbonized using a rotary drum reactor. The reactor operated with heat supplied by a High-Speed Diesel (HSD)-fueled burner. The carbonizer reached a maximum temperature of 600°C. In addition to biochar, the carbonization process also produced syngas, which was subsequently used to substitute HSD as a fuel source.The results indicated that the type of biomass significantly influenced burner efficiency during the carbonization process. Biochar derived from bamboo tended to have a higher cellulose content, whereas biochar from bromelain exhibited greater thermal decomposition stability. This study provides new insights into the potential of utilizing bromelain and bamboo biochar as sustainable strategies for agricultural soil management.The research demonstrated that biomass type selection during carbonization had a substantial impact on burner efficiency, which ranged from 81.15% to 84.45%. The HSD consumption of the burner was recorded at 35.03 kJ/hour. The use of biochar as an organic fertilizer offers an environmentally friendly and sustainable solution. Converting agricultural waste into biochar can serve as a strategic agenda for agricultural waste management.
Experimental and Analytical Investigation of Mooring Angle and Tube Mass Effects on the Dynamic Response of a Submerged Floating Tunnel Segment Model under Wave Excitation Akmal, Jamiatul; Dinata, Ragil Alvin; Tanti, Novri; Hasymi, Zulhendri; Nugraha, Nurcahya
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 23, No 1 (2026): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v23i1.77442

Abstract

The Submerged Floating Tunnel (SFT) is an alternative infrastructure for crossing transportation routes in deep and wide waters, but further studies are still needed on the dynamic response to wave forces. This study aims to evaluate the dynamic response of a wave-excited Tension Leg type SFT segment model, specifically regarding the influence of the mooring cable angle and the influence of the tube mass. This study was conducted using a damped forced vibration theory approach, exploring the relationship among three main elements of structural dynamics: mass (?), damping (?), and stiffness (?). These parameters are important as fundamental elements that determine the overall stiffness of the structure. The SFT segment model, made of a 3-inch (76 mm) diameter tube with a length of 700 mm, was installed at a depth of 1/6 z below the water surface. The parameters tested included the effect of the mooring cable angle (variations: 15°, 30°, and 45°) and the effect of the tube mass (variations: 0.5 kg, 0.75 kg, and 1 kg). The displacement response of the specimens was obtained from video recordings and analyzed using video tracking software. The experimental results show that an increase in the angle of inclination of the mooring cable leads to an increase in stiffness (?) and a smaller structural displacement. In addition, a larger tube mass results in a greater displacement. The experimental data showed good agreement with the theoretical model of single-degree-of-freedom (SDOF) damped forced vibration, with deviations below 10%. Therefore, this study recommends the use of the largest feasible mooring angle and smallest practical tube mass for optimal SFT design, while still considering real-world application limitations.
Co-Authors Amrul Amrul Hadi Prayitno Jamiatul Akmal Kurniawan, Dondi Nazarudin, Rizal Novri Tanti, Novri Nugraha, Nurcahya Saputra, Eko Wahyu Zulhendri Hasymi