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All Journal Science and Physics Education Journal (SPEJ) ORBITA: Jurnal Pendidikan dan Ilmu Fisika SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Jurnal Dinamika Sosial Budaya Jurnal Pengembangan Rekayasa dan Teknologi Elektrika Jurnal DISPROTEK Jambura Journal of Electrical and Electronics Engineering Journal of Civil Engineering and Technology Sciences Jurnal Teknik Sipil Al-Irsyad Journal of Physics Education Jurnal Komputer dan Elektro Sains Jurnal Pengabdian KOLABORATIF Advance Sustainable Science, Engineering and Technology (ASSET)

Fahrudin Ahmad

Universitas Semarang

Author-ID : 3344812

Agriculture, Biological Sciences & Forestry Arts Humanities Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

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Analisis Kualitas Daya Sebagai Indikator Keandalan dan Keselamatan Operasional Sistem Distribusi Listrik pada Gedung Bertingkat Muhammad Rivel Zebertavio; Priyo Adi Sesotyo; Fahrudin Ahmad
Science and Physics Education Journal (SPEJ) Vol. 9 No. 2 (2026): SPEJ (Science and Physics Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/jb0p6524

Abstract: This study aims to evaluate power quality and analyze its impact on the reliability of electrical distribution systems in a high-rise building. The study employed a quantitative descriptive method through field measurements using a Power Quality Analyzer PEL 103 Chauvin Arnoux installed on the distribution panels of ten floors. The observed parameters included voltage, voltage unbalance, current unbalance, power factor, and total harmonic distortion of voltage (THDv) and current (THDi). The results indicate that the voltage level (229.18–235.02 V), voltage unbalance (0.31–1.17%), power factor (0.86–0.99), and THDv (<5%) comply with IEC 61000, SNI IEC 61000, Permen ESDM No. 04 of 2009, and IEEE 519-2014/2022 standards. However, current unbalance exceeded the permissible limit of 20% on seven floors, and THDi values on several floors exceeded 15%, indicating the presence of nonlinear loads. It can be concluded that the electrical distribution system of the high-rise building exhibits good voltage stability; however, load balancing among phases and harmonic mitigation measures are necessary to maintain the long-term reliability and safety of the electrical installation. Keywords: Electrical Distribution, Harmonics, High-Rise Building, Power Factor, Power Quality.

Evaluasi Ketersediaan Biomassa Pertanian untuk Implementasi Co-firing pada PLTU Batubara Jawa Tengah Periode 2025–2030 Berbasis Low Emissions Analysis Platform (LEAP) Muhammad Ali Akbar Sholahuddin; Priyo Adi Sesotyo; Fahrudin Ahmad
Jurnal Komputer dan Elektro Sains Vol. 4 No. 1 (2026): komets
Publisher : Sultan Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58291/komets.v4i1.611

Provinsi Jawa Tengah menanggung kapasitas PLTU batubara terbesar di Indonesia sebesar 10.222,40 MW, sementara fraksi energi baru terbarukan baru mencapai 21,08 % dari target RUED sebesar 21,32 % pada 2025. Penelitian ini mengevaluasi ketersediaan biomassa pertanian Jawa Tengah untuk co-firing pada delapan PLTU batubara periode 2025 sampai 2030 menggunakan perangkat lunak Low Emissions Analysis Platform (LEAP). Massa biomassa yang tersedia diestimasi menggunakan metode Residue to Product Ratio yang dikoreksi dengan collection factor, diproyeksikan dari data produksi BPS 2020–2024. Hasil proyeksi menunjukkan biomassa tersedia turun dari 16,81 juta ton pada 2025 menjadi 15,79 juta ton pada 2030. Enam skenario co-firing, mengombinasikan dua rasio massa (2 % dan 5 %) dengan tiga skenario nilai kalor biomassa, menghasilkan penurunan input energi panas maksimum sebesar 2,77 %, jauh di bawah batas toleransi operasional 3 % yang lazim diterapkan pada boiler eksisting. Skenario 5 % rata-rata menghindarkan emisi 2,98 juta ton CO2 ekuivalen per tahun dan menaikkan fraksi EBT sektor ketenagalistrikan menjadi 22,51 %, di atas ambang RUED. Penghematan biaya bahan bakar netto berkisar Rp 0,95 sampai Rp 5,86 triliun per tahun tergantung skenario harga batubara. Temuan ini menunjukkan bahwa surplus biomassa pertanian Jawa Tengah memadai untuk mendukung implementasi co-firing, baik secara teknis maupun ekonomi.

Optimization of Coconut Fiber and Styrofoam Composition in Concrete to Improve Strength and Sound Absorption Purwanto; Ferry Firmawan; Fahrudin Ahmad; Hani Purwanti; Aimmatul Husna; Nadirah Darus; Zaiton Haron; Khairulzan Yahya
Advance Sustainable Science Engineering and Technology Vol. 8 No. 2 (2026): February-April
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v8i2.2752

This study aimed to evaluate the effect of coconut husk and Expanded Polystyrene (EPS) composition on the mechanical and acoustic properties of lightweight concrete. The research was conducted experimentally using a two-way factorial design with coconut husk variations of 0%, 0.5%, 1%, 1.5%, and 2% of cement weight and EPS variations of 0%, 10%, 20%, and 30% of coarse aggregate volume. A total of 20 mix variations (5 coir levels × 4 EPS levels) were prepared with three replications for each test, resulting in 120 specimens. Compressive strength was tested at 7 days following ASTM C39, while sound absorption was measured at frequencies of 100–2000 Hz based on ISO 10534-2. The results showed that the addition of coconut husk up to 1% improved compressive strength through fibre reinforcement, whereas increasing EPS content enhanced sound absorption due to higher porosity but reduced mechanical strength. Statistical analysis using ANOVA (R² = 0.94, p < 0.05) and desirability optimisation identified the optimal composition at 1% coconut husk and 10% EPS. The developed lightweight concrete is suitable for non-structural building components requiring improved acoustic performance and reduced weight.

Analisis Kelayakan dan Performa Sistem Hibrida PLTS-PLTB-PLTSA Terintegrasi Grid untuk Kebutuhan Energi Kampus Berbasis Homer Pro Moch Hikmah Risky Kurniawan; Priyo Adi Sesotyo; Fahrudin Ahmad
Science and Physics Education Journal (SPEJ) Vol. 10 No. 1 (2026): SPEJ (Science and Physics Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/9a0rdz78

Abstract:The increasing demand for electrical energy in university campuses requires the development of energy systems that are reliable, economically feasible, and environmentally sustainable. This study aims to evaluate the technical performance, economic feasibility, and environmental impact of a hybrid energy system integrating Solar Photovoltaic (PV), Wind Turbine (WT), and Waste-to-Energy (WTE) power generation connected to the utility grid. The research methodology involved collecting renewable energy resource data, electrical load profiles, and techno-economic parameters, which were subsequently analyzed using HOMER Pro software to determine the optimal system configuration. The simulation results indicate that the proposed system is capable of generating 972,876 kWh/year of electricity, with renewable energy contributing 717,784 kWh/year or approximately 73.8% of the total annual energy production. The system achieved a renewable fraction of 75.2%, a Net Present Cost (NPC) of IDR 13.85 billion, and a Cost of energy (COE) of IDR 1,122/kWh. Furthermore, the electricity exported to the grid reached 315,694 kWh/year, exceeding the imported electricity of 255,092 kWh/year, indicating that the system operates as a net exporter. From an environmental perspective, the WTE unit utilizes 88.7 tons of municipal solid waste annually while supporting emission reduction and renewable energy utilization. Overall, the results demonstrate that the proposed hybrid system is technically reliable, economically viable, and environmentally beneficial, making it a promising solution for supporting green campus development and sustainable energy implementation. Keywords: HOMER Pro; Hybrid System; PLTS; PLTSa; Renewable Energy.

Karakterisasi Peluruhan Energi Akustik (Reverberation Time) pada Beton Ringan Berbasis Material Biokomposit Fahrudin Ahmad; Purwanto
Jurnal Pengembangan Rekayasa dan Teknologi Vol. 10 No. 1 (2026): Mei (2026)
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v10i1.14206

Permasalahan kebisingan di lingkungan perkotaan menuntut pengembangan material konstruksi yang tidak hanya kuat secara struktural tetapi juga memiliki kinerja akustik yang baik. Penelitian ini bertujuan menganalisis karakteristik waktu dengung (reverberation time) pada beton akustik berbasis sabut kelapa dan styrofoam sebagai material ramah lingkungan. Metode yang digunakan adalah eksperimen melalui pengujian langsung pada ruang nyata dengan parameter T20, T30, dan early decay time (EDT) pada rentang frekuensi 100–3150 Hz. Hasil menunjukkan bahwa nilai T20 berkisar antara 1,09–1,87 detik dan T30 antara 1,15–1,82 detik, dengan kecenderungan menurun pada frekuensi tinggi hingga 0,97–1,24 detik. Nilai waktu dengung yang diperoleh berada di bawah 2 detik, menunjukkan kemampuan material dalam menyerap energi bunyi secara efektif. Dengan demikian, beton berbasis sabut kelapa dan styrofoam berpotensi sebagai solusi material akustik berkelanjutan untuk meningkatkan kualitas kenyamanan ruang.

ANALISIS TINGKAT KEBISINGAN TERHADAP AKTIVITAS BELAJAR MENGAJAR DI FAKULTAS TEKNIK UNIVERSITAS SEMARANG Fahrudin Ahmad; Iryan Dwi Handayani; Sri Heranurweni
Elektrika Vol. 10 No. 1 (2018): April 2018
Publisher : Universitas Semarang

Optimal teaching or learning activities require a conducive and quiet environment because the high concentration required on its process. Campus area requires a quiet and silent environment. It is difficult for the urban areas to get a quiet campus environment. The study tries to reveal the evaluation on how the noise factors that occur during teaching and learning process. The study was conducted at Semarang University. The research method used is descriptive analytic method. Research shows that the building of engineering faculty (the A building) at Semarang University shows the proper noise level in line with the standard (School Acoustic Quality Standards). Besides, Semarang University must establish rules and policies to control the noise levels, to intensify the comfort of the lecture process. Based on the research results, the noise level on the Engineering faculty building of Semarang University has not been in line with the predetermined standard, which is more than (55 dB).Keywords: noise, lecture activities, acoustic quality standards of school buildings

ANALISIS TINGKAT KEBISINGAN DI UNIVERSITAS SEMARANG DENGAN PETA KONTUR MENGGUNAKAN SOFTWARE GOLDEN 1 Fahrudin Ahmad; Iryan Dwi Handayani; Agus Margiantono
Elektrika Vol. 10 No. 2 (2018): Oktober 2018
Publisher : Universitas Semarang

Campus is a place which is teaching and learning process occur. One factor that support a good learning environment is to avoid noise problems. The object of the research is the campus of Semarang University located on Jalan Arteri Soekarno-Hatta, it is located on the edge of the Kaligawe-Gayamsari toll road. Both roads includes the most crowded transportation routes in Semarang City.Campus area requires a quiet and silent environment. It is difficult for the urban areas to get a quiet campus environment. The study tries to reveal the evaluation on how the noise factors that occur during teaching and learning process. The study was conducted at Semarang University. The research method used is descriptive analytic method. The research was conducted by measuring the noise level using Sound Level Meter (KRISBOW) type KW08-291, several data collection points was taken at Semarang University, both open and closed environments around campus. The results of noise measurements would be carried out in noise mapping to know the noise distribution map in the campus area. The noise level in the campus is still above 55 dB on average. It shows that the noise level in the environment of Semarang University has not been in line with the predetermined standard that is still greater than (40 - 50 dBA) in accordance to the decree of the State Minister of the Environment number 48 of 1996.Keywords: noise, sound level meter, noise threshold value, decree of the State Minister of the Environment number 48 of 1996

VISUALISASI KONSEP PERLAYANGAN GELOMBANG DENGAN MEMANFAATKAN SPREADSHEET EXCEL Iryan Dwi Handayani; Agus Margiantono; Fahrudin Ahmad
Elektrika Vol. 10 No. 2 (2018): Oktober 2018
Publisher : Universitas Semarang

Perkembangan ilmu pengetahuan dan teknologi yang semakin maju telah menghasilkan berbagai macam peralatan canggih yang dapat menunjang terpenuhinya kebutuhan hidup. Oleh sebab itu diperlukan generasi penerus yang pandai dan kreatif. Hal ini yang menyebabkan kebutuhan pendidikan yang semakin tinggi dan permasalahannya semakin kompleks. Pembelajaran tentang gelombang sudah didapatkan sejak duduk di bangku SMP, tetapi pemahaman tentang hal ini masih kurang. Oleh karena itu, dengan memanfaatkan fasilitas-fasilitas yang diberikan komputer, perumusanperumusan gelombang elektromagnetik yang abstrak akan lebih mudah dipahami. Visualisasi dari grafiknya dapat memberikan kemudahan bagi mahasiswa untuk lebih memahami materi yang diberikan. Penelitian ini dilaksanakan dalam dua tahapan, tahapan yang pertama dimulai dari studi pustaka pendukung terutama yang berkaitan dengan superposisi gelombang. Langkah selanjutnya adalah menurunkan rumusan superposisi dua gelombang dengan variasi frekuensi, amplitudo, dan fase yang berbeda-beda. Tahapan kedua yang dilakukan hampir sama dengan tahapan pertama yaitu studi pustaka, namun cukup dengan memperoleh fungsi gelombang tunggal. Selanjutnya berdasarkan fungsi gelombang dengan variasi frekuensi, amplitudo, dan fase. Proses superposisi gelombang dilakukan dengan cara menjumlahkan data sintetik fungsi gelombang 1 dan 2, menghasilkan data sintetik fungsi gelombang hasil superposisi. Data sintetik ini kemudian divisualisasikan dalam bentuk grafik Penelitian ini menghasilkan visualisasi konsep perlayangan gelombang yang diungkapkan dalam grafik hubungan antara simpangan terhadap waktu dengan frekuensi berbeda, amplitudo dan beda fase yang berbeda. Kata kunci : perlayangan gelombang, superposisi, spreadsheet

Implementasi Penerangan Jalan Umum Berbasis Solar Cell untuk Peningkatan Keamanan Lingkungan di Widoro I Kelurahan Sembungharjo Genuk Kota Semarang Fahrudin Ahmad; Roni Kartika Pramuyanti; Taufiq Dwi Cahyono
Jurnal Pengabdian KOLABORATIF Vol. 4 No. 1 (2026): January
Publisher : Faculty of Engineering, Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/kolaboratif.v4i1.13255

The lack of adequate lighting in Widoro I – Perbalan 3 increases security risks and limits community activities at night. This program provides an independent and sustainable street-lighting solution through the installation of a 1500 W portable solar-powered street lighting (PJU) system. The implementation method integrates the diffusion of appropriate technology, training, and the ABCD approach to ensure technical sustainability and community involvement. The activities include a needs survey, technical planning, installation, socialization, and monitoring. The results indicate an increase in illuminance from 2–3 lux to 25–30 lux, a panel efficiency of 21%, and the availability of backup power for up to three days. The motion sensor system has been proven to improve energy efficiency and expand lighting coverage. Socially, the program increases nighttime activities by 65% and enhances perceptions of environmental safety. This program demonstrates that the application of portable solar-powered street lighting can serve as an effective, efficient, and replicable appropriate-technology model for residential areas with limited access to energy. These findings emphasize the importance of synergy between renewable energy technology and community empowerment to achieve local energy independence.

Pelatihan Instalasi dan Troubleshooting Sistem Audio untuk Pengurus Mushola Aljabbar Desa Tawangrejo Winong Kabupaten Pati Fahrudin Ahmad; Supari; Agus Margiantono; Satria Pinandita
Jurnal Pengabdian KOLABORATIF Vol. 4 No. 1 (2026): January
Publisher : Faculty of Engineering, Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/kolaboratif.v4i1.13262

This community service program was conducted to enhance the technical abilities of the management team of Mushola Aljabbar, Tawangrejo, Pati regency, in operating and maintaining the audio system used for religious and social activities. The main problems identified include limited knowledge of audio installation, insufficient understanding of maintenance procedures, and difficulties in handling minor technical issues. The program employed a participatory training method that consisted of theoretical sessions, hands-on installation practice, maintenance activities, and troubleshooting simulations. Participants also took pre-test and post-test evaluations. The results indicate a significant improvement in participants’ competencies, demonstrated by an average score increase of 39.16%. Participants were able to perform basic installation, conduct routine maintenance, and independently solve common technical problems. This program had a positive impact on improving audio quality in the mushola and increasing the management’s self-reliance. Continuous training is recommended to ensure adaptability to technological developments in audio systems.

Co-Authors Agus Margiantono Aimmatul Husna Bagus Acung Billahi Bagus Ferdiansah Diah Aryati P.L Erlinasari Erlinasari Faizal Mahmud Ferry Firmawan Hani Purwanti Khairulzan Yahya Kukuh Wisnuaji Widiatmoko Masvika, Hendra Moch Hikmah Risky Kurniawan Muhammad Ali Akbar Sholahuddin Muhammad Rivel Zebertavio Nadirah Darus Purwanto Roni Kartika Pramuyanti Satria Pinandita Sesotyo, Priyo Adi Sri Heranurweni Supari Supari, Supari Taufiq Dwi Cahyono Yusuf Nurul Hilal Zaiton Haron

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