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All Journal Rotasi Sinergi World Chemical Engineering Journal Jurnal Teknik Mesin Indonesian Journal of Energy Industri Inovatif : Jurnal Teknik Industri International Journal of Advanced Technology in Mechanical, Mechatronics and Material (IJATEC) Jurnal Pengabdian Masyarakat Bhinneka International Journal of Innovation in Mechanical Engineering and Advanced Materials Aceh International Journal of Science and Technology
Andi Firdaus Sudarma
Universitas Mercu Buana
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering 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 Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health

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Optimizing the Purging Interval of 1 kW PEM Fuel Cell Control System in Fuel Cell Vehicles Kurniawan Kurniawan; Kontan Tarigan; Andi Firdaus Sudarma; Raden Dwi Pudjisusilo; Deni Shidqi Khaerudini
Indonesian Journal of Energy Vol. 7 No. 2 (2024): Indonesian Journal of Energy
Publisher : Purnomo Yusgiantoro Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33116/ije.v7i2.210

Abstract

This study was conducted to explore and understand the duration of purging in fuel cell control systems and their application in fuel cell vehicles, a critical aspect that has a significant impact on the overall performance and efficiency of vehicles or devices that use fuel cell technology. The method adopted in this research involves modeling and simulation using a simulation platform, SIMULINK-MATLAB; modeling is carried out with a program and then validated with test data. This approach allows researchers to replicate and analyze system dynamics virtually to identify existing systems so that empirical models can be identified. Apart from that, the performance characteristics of the given parameters can be known by knowing the model and simulation before the physical implementation is carried out. From the study results, it was found that the modeling carried out with transfer function model 0.02635 s + 1.036/s + 0.04359 and validated with the test results 87.19% fit to estimation data was quite valid so that the model identification could be said to be suitable for this study.
SIMULATION HEAT AFFECTED ZONE WELDING ON AISI 1045 STEEL USING MATLAB hardi gunawan; Andi Firdaus; Kontan Tarigan; M Azizi; Deni Shidqi Khaerudini
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol. 15 No. 01 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v15i01.27335

Abstract

In this Research, AISI 1045 steel plate test objects were welded using SMAW welding. A thermal simulation of the welding process (heat input simulation) is performed by entering the maximum temperature distribution on a 140 x 140 mm plate with a thickness of 4 mm, made of AISI 1045 steel. Initially, the plate has temperature limits of 700 °C, 500 °C, above 1300 °C, and below 0 °C. The bottom of the plate is protected by a constant-temperature shield. The test object is then described numerically using the MATLAB program. In this Research, we can use MATLAB to develop a mathematical and numerical model that captures the effect of the heat-affected zone (HAZ) on the mechanical properties of AISI 1045. This model helps in the understanding of how the heat input provided from the welding process influences the mechanical material properties and allows us to optimize the Influence of the process to obtain the desired results. Calculations carried out using the MATLAB application obtained results in the 9th iteration for errors <1%, namely 0.4681%. Considerable heat input results in low tensile strength; this shows that the welded joint, with the electrodes used and the given welding parameters, produced good joint strength.
Pengolahan Sampah Organik Menjadi Pupuk Cair Menggunakan Biokomposter di Pondok Pesantren Bait Qur'ani Bogor Haris Wahyudi; Nurato Nurato; Wiwit Suprihatiningsih; Nur Indah; Fajar Anggara; Henry Carles; Ariosuko Dharmajati; Andi F Sudarma
Jurnal Pengabdian Masyarakat Bhinneka Vol. 5 No. 1 (2026): September
Publisher : Bhinneka Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58266/jpmb.v4i4.1651

Abstract

Sampah organik merupakan komponen terbesar sampah domestik di Indonesia dan berisiko mencemari lingkungan jika tidak dikelola dengan baik. Pondok Pesantren Bait Qur'ani telah memiliki fasilitas komposter, namun pemanfaatannya belum optimal karena pemilahan sampah belum konsisten dan pengetahuan peserta mengenai pengoperasian komposter serta proses fermentasi masih terbatas. Kegiatan pengabdian kepada masyarakat ini bertujuan meningkatkan pengetahuan dan keterampilan peserta dalam mengolah sampah organik menjadi pupuk organik cair (POC) menggunakan biokomposter berbantuan bioaktivator Effective Microorganisms 4 (EM4). Metode yang digunakan adalah Participatory Learning and Action (PLA), meliputi koordinasi dengan mitra, penyuluhan, demonstrasi pengoperasian komposter, praktik langsung oleh peserta, dan evaluasi melalui kuesioner persepsi. Demonstrasi menggunakan campuran sampah organik basah dan kering dengan rasio sekitar 80:20 yang difermentasi untuk menghasilkan POC sebagai produk utama dan kompos padat sebagai produk samping. Hasil kegiatan menunjukkan peserta mampu memahami prinsip pemilahan sampah, tahapan pengoperasian biokomposter, penggunaan EM4, proses fermentasi, dan teknik pemanenan POC, dengan mayoritas peserta memberikan tanggapan Setuju hingga Sangat Setuju terhadap materi dan manfaat teknologi ini. Dengan potensi timbulan sampah organik 25–44 kg per hari, optimalisasi biokomposter berpotensi mengurangi beban sampah ke TPA sekaligus menghasilkan POC bermanfaat bagi pemeliharaan tanaman, mendukung konsep Green Pesantren dan ekonomi sirkular.
Demineralization of Silica-Rich Agar Processing Residues via Hydrofluoric Acid Leaching for Organic Fraction Enrichment Andi Firdaus Sudarma; Edy Hartulistiyoso; Y. Aris Purwanto; Leopold Oscar Nelwan; Obie Farobie; Hendri; Harri Junaedi; Edy Herianto Majlan
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 8 No. 2 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v8i2.38546

Abstract

Agar solid waste (ASW) is a silica-rich industrial residue generated during agar extraction that contains organic residue mixed with mineral filtration aids such as Celite (diatomaceous earth) and perlite. Its high ash content and low organic fraction limit its direct utilization as a biomass-derived fuel. This study investigated hydrofluoric acid (HF) leaching as a demineralization pretreatment to reduce silica-rich minerals and improve the physicochemical quality of ASW. Two ASW samples obtained from different agar-processing plants, namely ASW-Celite (contain Celite) and ASW-Perlite (contain perlite), were treated using 10 wt% HF at a solid-to-liquid ratio of approximately 1:12. The treated samples were characterized using XRF, ICP-MS, FTIR, ultimate analysis, and proximate analysis. HF leaching caused substantial mass reduction, with solid yields of 24.99% for ASW-Celite-HF and 48.9% for ASW-Perlite-HF. Ash content decreased from 85.84 to 44.99 wt% in ASW-Celite and from 77.10 to 24.83 wt% in ASW-Perlite. XRF analysis confirmed significant silica removal, particularly in ASW-Celite, where SiO₂ decreased from 96.94 to 21.30%. ICP-MS further showed the reduction of several ash-forming and environmentally relevant elements, including Cr, Ni, Cu, Zn, Cd, P, S, Cl, Mn, and Fe. HF treatment also enriched the organic fraction, increasing carbon content from 4.69 to 12.52 wt% in ASW-Celite and from 9.83 to 16.10 wt% in ASW-Perlite. The HHV of ASW-Celite improved from 1.91 to 6.52 MJ/kg, whereas ASW-Perlite decreased from 4.80 to 3.19 MJ/kg due to its high oxygen content after treatment. These findings demonstrate that HF leaching effectively reduces silica-rich minerals in ASW, although further deoxygenation is required to improve its fuel quality for bioenergy applications.
Influence of inorganic content on hydrochar quality from high-ash agar extraction waste via hydrothermal carbonization Andi Firdaus Sudarma; Edy Hartulistiyoso; Yohanes Aris Purwanto; Leopold Oscar Nelwan; Obie Farobie; Nono Darsono; Khuzaimah Arifin; Maharani Dewi Solikhah; Tri Yulni; Imam Hidayat; Muhamad Fitri; Edy Herianto Majlan
SINERGI Vol. 30 No. 3 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2026.3.005

Abstract

Agar solid waste (ASW) has potential as a feedstock for hydrochar production because of its organic content; however, its high inorganic fraction, predominantly silica, limits its application. Furthermore, studies specifically investigating the hydrothermal carbonization (HTC) of ASW remain limited, given its high ash content and low energy value. This study investigated the HTC of ASW at varying temperatures (180–220 °C) and reaction times (30–90 minutes), with particular emphasis on how two inorganic components (celite versus perlite) affect hydrochar yield, composition, and energy properties. The resulting hydrochars were characterized using CHNSO, proximate, SEM, and FTIR analysis. The results revealed high ash contents reaching 77.7–92.08%, corresponding to HHV of 2.3–3.4 MJ kg⁻¹, while FTIR spectra confirmed strong silica presence through prominent Si–O–Si absorption bands. Therefore, the study provides valuable insights into silica-rich biomass behavior during HTC. The study also evaluated the relationship between HHV and ash content and analyzed the kinetic model. The results demonstrate the significant influence of inorganic components on carbonization pathways, highlighting opportunities to enhance hydrochar quality through pretreatment strategies such as acid/alkaline leaching or mineral separation.
Co-Authors A. M. Leman Albert Phak Jie Wong Alfa Firdaus Amiruddin Aziz Anggara, Fajar Ariosuko Dharmajati Aris Purwanto Azhar, Azmi Azizi, M Dafit Feriyanto Dedik Romahadi Deni Shidqi Khaerudini Deni Shidqi Khaerudini Deni Shidqi Khaerudini Dian Wijayanto Djajadiwinata, Eldwin Edy Hartulistiyoso Edy Herianto Majlan Edy Herianto Majlan Eldwin Djajadiwinata Fajar Anggara Fajar Anggara Fajar V.Enriko Firmansyah, Nisfi Hadi Pranoto Hadi Pranoto hardi gunawan Hardi Gunawan Haris Wahyudi Harri Junaedi Hendri Hendri Henry Carles Henry Carles Hui Xiong Imam Hidayat Inayaturrakhman, Ikhsan Islahuddin Islahuddin Khuzaimah Arifin Kontan Tarigan Kontan Tarigan Kontan Tarigan Kurniawan Kurniawan Lutfiansyah, Anggi M Azizi Maharani Dewi Solikhah Mardani A. Sera Muhamad Fitri Muhammad Akmal Nelwan, Leopold Oscar Nono Darsono Nur Indah Nur Indah, Nur Nurato Nurato Obie Farobie Oktaviani, Ana Nur Pandriana, Aap Popy Yuliarty Pudjiwati, Sri Raden Dwi Pudjisusilo Rini Anggraini Sagir Alva Sari, Andarany Kartka Sri Pudjiwati Subekti Subekti Supaat Zakaria Susilo, R Dwi Pudji Swandya Eka Pratiwi Tarigan, Kontan Tri Yulni Wahyudi, Haris Widianto, Fajar Wiwit Suprihatiningsih Xiong, Hui