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PENGARUH PUTARAN TERHADAP POMPA SENTRIFUGAL PADA RANGKAIAN SERI DAN PARALEL Mastur, Mastur; Warso, Warso
PROSIDING SENATEK FAKULTAS TEKNIK UMP 2015: PROSIDING SENATEK TAHUN 2015, 28 November 2015
Publisher : PROSIDING SENATEK FAKULTAS TEKNIK UMP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Pompa sampai saat ini masih banyak dibutuhkan dan dipergunakan, baik untuk kepentingan industri, rumah tangga Â maupun kebutuhan lainnya.Â Dengan perkembangan ilmu pengetahuan dan tekonologi, mendorong manusia untuk selalu berusaha membuat inovasi dan terobosan demi menghasilkan Â performan pompa yang maksimal.Dalam memaksimalkan pompa sentrifugal, kami melakukan penelitian tentang pengaruh putaran terhadap pompa sentrifugal pada rangkaian seri dan paralel. Pengujian dengan menggunakan putaran 1800 rpm, 2000 rpm, 2200 rpm,2400 rpm,2600 rpm, 2800 rpm Kapasitas hasilpengujiandiperoleh pada putaran 1800 rpm, yaitu sebesar Â 3,276 liter/detik. Head diperoleh pada putaran 2800 rpm sebesar 20,033. dan dayaÂ terbesar pada putaran 2800rpm sebesar 355,34 watt. .Padarangkaianpararel, putaran 1800rpm juga menghailkan kapasitas terbesar yaitu Â 3,63 liter/detik,. Headyang diperoleh pada putaran 2800rpm sebesar 227,2 .watt.Kata kunci :pompa sentrifugal, putaran,head, daya dan kapasitasÂ

Analisis Value Stream Mapping (VSM) untuk Mengeliminasi Pemborosan pada Produksi Plywood Soleh, Muhamad; Kurniawan, Aditya; Warso, Warso; Khamdani, Haris
Proceedings Series on Physical & Formal Sciences Vol. 6 (2023): Prosiding Seminar Nasional Teknik (SENATEK) 2023
Publisher : UM Purwokerto Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/pspfs.v6i.856

This research aims to improve the identification of issues in plywood production at CV. Karya Purabaya. The inefficient production process leads to production times not meeting the standards, causing the company to often fail to fulfill orders on time. To implement improvements, the company needs to examine the production system comprehensively to pinpoint the issues in the production process. Value Stream Mapping (VSM) analysis, which is one of the Lean Manufacturing methods, is used to identify wasteful practices in the plywood production system. In identifying wasteful practices, Value Stream Analysis Tools (VALSAT) is utilized to identify connections and relationships between different wasteful practices. Waste Assessment Questionnaire (WAQ) is used to identify the most dominant waste, and Fishbone Diagram is employed to determine the root causes of the waste. Based on the results from the WAQ calculations, it was found that the most dominant waste is Overproduction with a percentage of 22.43%, followed by Inventory with a percentage of 20.40%. Furthermore, the WRM calculations reveal that inappropriate processing has a high percentage of 20.3%, and the value to Inventory has the highest percentage of 21.0%. The proposed improvements to minimize the most dominant waste at CV. Karya Purabaya include balancing the production process flow by implementing line balancing with an efficiency rate of 73,85%, conducting regular machine maintenance, making accurate planning and forecasting, and reducing defect.

Pengaruh Variasi Porting pada Head Cylinder Terhadap Unjuk Kerja Mesin Sepeda Motor 4 Langkah 110 CC Warso, Warso; Rekto Prabowo, Nugrah; Nurwibowo, Trio
Accurate: Journal of Mechanical Engineering and Science Vol. 2 No. 2 (2021): October 2021
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v2i2.1010

Improving engine performance can be done by making changes to the cylinder head to increase the volumetric efficiency. The purpose of this study was to determine the effect of ported variations on the cylinder head against the engine performance which includes: airflow, torque, and power, generated by the ported variations on the inlet channel inside the standard cylinder head with the inlet port size of 21.50 mm. The ported variation 1 with a 23.50 mm inlet port diameter, and the ported variation 2 with an inlet port diameter of 25.50 mm. The research method used was an experimental method, carried out on a 4-stroke 110 cc motorcycle. The results obtained indicated the differences in the performance produced, such as airflow, torque, and power in the three variations of the inlet port. In the Cylinder head ported variation 1, the maximum air flow obtained was 30 cfm at 7 mm valve opening. The airflow increased by 3.59% against the standard cylinder head which obtained a maximum airflow of 28.8 cfm at the same valve opening. On the other hand, the cylinder head ported variation 2 obtained a maximum airflow of 27.6 cfm at the same valve opening. It means that the airflow decreased by 4.77% against the standard cylinder head. On ported variation 1 cylinder head, a maximum torque of 8.91 Nm was obtained at 4250 rpm, resulting in the torque increase of 2.49% against the standard cylinder head which obtains a maximum torque of 8.58 Nm at 4500 rpm. With the ported variation 2 cylinder head, maximum torque of 8.15 Nm was obtained at 5750 rpm rotation, which means that the torque decreased by -3.53% against the use of a standard cylinder head. With ported variation 1 cylinder head, maximum power of 7.49 HP was obtained at 7250 rpm and the power increased by 2.41% against the standard cylinder head, which obtained maximum power of 7.27 HP at 7500 rpm. While the ported variation 2 cylinder head, the maximum power obtained was 7.16 HP at 7500 rpm, meaning the decrease in power obtained by -2.76% against the standard cylinder head.

PENGARUH JENIS PLASTIK TERHADAP KUALITAS MINYAK PIROLISIS: STUDI KONVERSI, ANGKA CETANE DAN ANGKA OKTAN MENGGUNAKAN REACTOR PIROLISIS TABUNG MENDATAR KAPASITAS 100 KG SELF-SUFFICIENT Mulyana, Riyan; Warso, Warso; Sugiantoro, Bambang; Amanulloh, Rivkih; Sutarno, Sutarno
JURNAL CRANKSHAFT Vol 8, No 3 (2025): Jurnal Crankshaft Vol. 8 No. 3 (2025)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v8i3.15495

Penelitian ini menganalisis karakteristik minyak hasil pirolisis dari berbagai jenis plastik, termasuk polietilena (PE), polipropilena (PP), polistirena (PS), dan Styrofoam, serta plastik campuran, dengan fokus pada konversi minyak, angka cetane, dan angka oktan. Hasil eksperimen menunjukkan bahwa durasi optimal pirolisis adalah 4 jam, di mana produksi minyak mencapai titik tertinggi sebelum berkurang akibat peningkatan pembentukan gas. PE dan PP menunjukkan konversi minyak tertinggi (lebih besar dari 70 persen), dengan rantai hidrokarbon yang lebih panjang dan kestabilan termal yang baik, sehingga lebih sesuai untuk aplikasi bahan bakar diesel. Sebaliknya, PS dan Styrofoam menghasilkan minyak dengan angka oktan tinggi (lebih besar dari 90), tetapi dengan konversi minyak yang lebih rendah (lebih kecil dari 70 persen), akibat dekomposisi struktur aromatiknya yang lebih kompleks. Hal ini menjadikan minyak hasil pirolisis PS dan Styrofoam lebih sesuai sebagai substitusi bensin. Perbedaan komposisi hidrokarbon dalam produk minyak ini menunjukkan bahwa karakteristik bahan bakar yang dihasilkan sangat bergantung pada jenis plastik yang digunakan. Oleh karena itu, optimasi pirolisis dengan katalis atau modifikasi kondisi reaktor diperlukan untuk meningkatkan selektivitas terhadap fraksi bahan bakar yang diinginkan, baik untuk aplikasi diesel maupun bensin

OPTIMASI VORTEX WET SCRUBBER DENGAN SUSPENSI DOLOMIT UNTUK PENANGKAPAN PARTIKEL KARBON ULTRAFINE DAN POLUTAN ASAM YANG LEBIH EFISIEN Gunawan, Gunawan; Sugiantoro, Bambang; Ngisomudin, Ngisomudin; Warso, Warso; Supriyana, Nana
JURNAL CRANKSHAFT Vol 8, No 3 (2025): Jurnal Crankshaft Vol. 8 No. 3 (2025)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v8i3.15565

Pencemaran udara akibat emisi partikulat dari pembakaran sampah menjadi tantangan lingkungan yang signifikan. Penelitian ini mengembangkan sistem Vortex Wet Scrubber (VWS) berbasis larutan air dan dolomit untuk meningkatkan efisiensi pengendalian emisi gas dan partikulat halus. Uji eksperimental menunjukkan bahwa sistem ini mampu mengurangi PM10 hingga 95–98%, PM2.5 hingga 90–95%, dan PM1.0 hingga 75–85%, dengan efisiensi absorpsi gas mencapai 98% untuk SO₂ dan 90% untuk NOₓ pada kelarutan dolomit 20% (pH 9.5–10.0). Namun, 5–15% partikel karbon ringan (1 µm) masih lolos, disebabkan oleh hidrofobisitas partikel, waktu kontak yang terbatas, dan ukuran partikel yang sangat kecil. Optimasi dilakukan melalui peningkatan turbulensi, penggunaan surfaktan, dan penambahan koagulan untuk meningkatkan penyerapan karbon ringan. Hasil penelitian menunjukkan bahwa sistem ini lebih hemat energi dibandingkan Ventury Scrubber, dengan konsumsi daya yang lebih rendah. Kombinasi teknologi VWS dengan elektrostatik atau penyemprotan ultra-halus berpotensi meningkatkan efisiensi lebih lanjut. Studi ini menawarkan solusi inovatif dalam teknologi pengendalian emisi yang ramah lingkungan, serta menjadi dasar pengembangan sistem pencucian asap yang lebih efektif untuk aplikasi industri dan perkotaan.

Pengaruh Variasi Porting pada Head Cylinder Terhadap Unjuk Kerja Mesin Sepeda Motor 4 Langkah 110 CC Warso, Warso; Rekto Prabowo, Nugrah; Nurwibowo, Trio
Accurate: Journal of Mechanical Engineering and Science Vol. 2 No. 2 (2021): October 2021
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v2i2.1010

Improving engine performance can be done by making changes to the cylinder head to increase the volumetric efficiency. The purpose of this study was to determine the effect of ported variations on the cylinder head against the engine performance which includes: airflow, torque, and power, generated by the ported variations on the inlet channel inside the standard cylinder head with the inlet port size of 21.50 mm. The ported variation 1 with a 23.50 mm inlet port diameter, and the ported variation 2 with an inlet port diameter of 25.50 mm. The research method used was an experimental method, carried out on a 4-stroke 110 cc motorcycle. The results obtained indicated the differences in the performance produced, such as airflow, torque, and power in the three variations of the inlet port. In the Cylinder head ported variation 1, the maximum air flow obtained was 30 cfm at 7 mm valve opening. The airflow increased by 3.59% against the standard cylinder head which obtained a maximum airflow of 28.8 cfm at the same valve opening. On the other hand, the cylinder head ported variation 2 obtained a maximum airflow of 27.6 cfm at the same valve opening. It means that the airflow decreased by 4.77% against the standard cylinder head. On ported variation 1 cylinder head, a maximum torque of 8.91 Nm was obtained at 4250 rpm, resulting in the torque increase of 2.49% against the standard cylinder head which obtains a maximum torque of 8.58 Nm at 4500 rpm. With the ported variation 2 cylinder head, maximum torque of 8.15 Nm was obtained at 5750 rpm rotation, which means that the torque decreased by -3.53% against the use of a standard cylinder head. With ported variation 1 cylinder head, maximum power of 7.49 HP was obtained at 7250 rpm and the power increased by 2.41% against the standard cylinder head, which obtained maximum power of 7.27 HP at 7500 rpm. While the ported variation 2 cylinder head, the maximum power obtained was 7.16 HP at 7500 rpm, meaning the decrease in power obtained by -2.76% against the standard cylinder head.

Effect of Speed and Turning Time Pulley on the Quantity and Quality of Output Multipurpose Chopper Machine Sari, Kartika; Sunardi, Sunardi; muwaffaq, Abiyyu Sayyid; Aminuddin, Jamrud; Khoryanton, Ampala; Warso, Warso; Budi Utomo, Agung Bambang
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4098

Variation of pulley rotational speed on the yield and cut of the multipurpose chopper aims to determine the optimum quality and quantity of chopping results. Testing using cassava and bananas. The diameter of the pulley used is 2 inches and the driven pulley is 6, 7, and 10 inches with a pulley speed of 467, 400, and 275 rpm. The result of bananas shows that the average chopping was 573, 864, and 864 grams, respectively with the spin pulley time being 46, 90, and 59 seconds. Meanwhile, for cassava, the results of chopping were 984, 995, and 823 grams, respectively with the spin pulley time being 23, 59, and 35 seconds, respectively. The optimum chopping quality for bananas used a pulley diameter of 10 inches and an optimum rotation time was 59 seconds. The optimum slicing quality for cassava uses a pulley diameter of 7 inches with an optimum rotation time was 59 seconds. The conclusion is that the diameter of the pulley affects the thickness of the sample, the time and speed of the pulley rotation, and the quality of the chopping results.

Peningkatan Kapasitas dan Nilai Tambah Kopi Robusta Melalui Inovasi Pascapanen Kelompok Tani Trisno Maju Di Talagening Purbalingga Sugiarto, Tris; Sutisna, Utis; Hidayati, Nurul; Warso, Warso; Nurhidayat, Achmad
BUDIMAS : JURNAL PENGABDIAN MASYARAKAT Vol. 7 No. 3 (2025): BUDIMAS : Jurnal Pengabdian Masyarakat
Publisher : LPPM ITB AAS Indonesia Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29040/budimas.v7i3.18299

Kopi merupakan salah satu komoditas unggulan yang memiliki nilai ekonomi tinggi, namun pengolahan pascapanen pada tingkat petani sering terkendala oleh keterbatasan teknologi. Kelompok Tani Trisno Maju di Desa Talagening, Purbalingga, masih melakukan proses pengupasan kulit kopi secara manual sehingga membutuhkan waktu lama, tenaga besar, dan hasil kurang optimal. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk meningkatkan efisiensi dan kualitas produk kopi melalui penerapan mesin pengupas kulit kopi (huller) dengan daya motor bensin dan mesin packing sealer otomatis. Metode yang digunakan meliputi pelatihan teknis pascapanen, pendampingan manajemen usaha, penerapan teknologi tepat guna (huller dan sealer kopi), serta pelatihan pemasaran digital melalui media sosial dan marketplace. Hasil kegiatan menunjukkan peningkatan signifikan pada beberapa aspek. Pengetahuan peserta meningkat dari rata-rata 55% menjadi 85% berdasarkan hasil pre-test dan post-test. Kapasitas pengupasan kopi meningkat dari 30–40 kg/jam menjadi 150–200 kg/jam dengan penurunan tingkat kerusakan biji dari 10% menjadi 3–4%. Kemampuan pembukuan dasar dan analisis biaya meningkat dari 20% menjadi 80% anggota kelompok tani. Dari sisi pemasaran, volume penjualan naik dari 20–25 kg/bulan menjadi 60–70 kg/bulan dengan perluasan pasar melalui platform digital. Kegiatan ini membuktikan bahwa kombinasi inovasi teknologi dan peningkatan kapasitas SDM mampu memperkuat kemandirian ekonomi kelompok tani kopi serta meningkatkan daya saing produk lokal di pasar berbasis digital.

Development of a Blended Learning Model Based on Edmodo for PKL Students in Vocational High Schools Cahyono, Budhi; Amanulloh, Rivkih; Warso, Warso; Ngisomudin, Ngisomudin; Ayundha, Titania Allin
Journal of Vocational Education Studies Vol. 9 No. 1 (2026): Vol 9 No 1 (IN PRESS)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/joves.v9i1.10449

The purpose of this study was to develop an Edmodo-based blended learning model for street vendors in vocational high schools, analyze the feasibility of the model, and test its effectiveness. The study was conducted at SMK Muhammadiyah Sampang, Cilacap Regency, using a research and development (R&D) method based on the ADDIE model. The research design used a one-group pretest-posttest design. The development procedure included analysis, design, development, implementation, and evaluation stages. In the analysis stage, a student needs survey was conducted, while the design stage was adjusted to the learning needs. The next stage of development included validation by experts on the model and materials, and then the product was revised. Implementation was carried out on 60 students of grade XI in the Light Vehicle Engineering study program. The research results show that Edmodo-based blended learning is suitable as an alternative learning model, particularly to support internship activities. This model can be implemented according to a plan consisting of orientation, organization, investigation, analysis, and evaluation. In terms of effectiveness, student learning outcomes with Edmodo-based blended learning achieved an average of above 80, significantly different from the group not using Edmodo. Furthermore, this model can increase student motivation and learning independence. Based on these findings, the study recommends further development of the Edmodo-based blended learning model as a complement to face-to-face learning, especially in normative and adaptive subjects in vocational high schools.

ANALISIS KOMPOSISI UNSUR PRODUK PIROLISIS BIOMASSA UNTUK APLIKASI CO-FIRING PLTU Sutarno, Sutarno; Mastur, Mastur; Hartono, Hartono; Warso, Warso; Sugiarto, Tris; Sugiantoro, Bambang
JURNAL CRANKSHAFT Vol. 8 No. 4 (2025): Jurnal Crankshaft Vol. 8 No. 4 (2025)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v8i4.15826

Penelitian ini membahas penerapan pendekatan pirolisis terintegrasi untuk mengonversi biomassa dan sampah terpilah menjadi bahan bakar padat ramah lingkungan yang dapat dimanfaatkan dalam program co-firing PLTU. Bahan baku yang digunakan meliputi kayu limbah, cangkang kelapa, dan bubur sampah terpilah yang diproses pada variasi suhu dan waktu pirolisis. Hasil penelitian menunjukkan bahwa jenis bahan baku berpengaruh signifikan terhadap karakteristik arang yang dihasilkan. Kayu limbah cenderung menghasilkan arang dengan kualitas stabil dan kadar air rendah, sedangkan cangkang kelapa menunjukkan performa terbaik dengan nilai kalor tinggi dan kadar abu lebih rendah. Sebaliknya, bubur sampah terpilah masih memiliki tantangan pada kandungan air dan nilai kalor, meskipun tetap berpotensi sebagai bahan baku energi alternatif. Analisis morfologi dan komposisi unsur mengonfirmasi bahwa kandungan karbon lebih dominan pada biomassa dibandingkan bursam, yang kaya mineral anorganik. Secara umum, tren hasil menunjukkan bahwa biomassa murni lebih unggul untuk produksi energi dengan kualitas tinggi, sementara bursam dapat difungsikan sebagai bahan substitusi tambahan. Temuan ini menegaskan peran pirolisis terintegrasi sebagai pendekatan berkelanjutan untuk mendukung diversifikasi energi dan pengelolaan sampah di Indonesia.Kata kunci: Pirolisis; biomassa; sampah terpilah; Kayu; cangkang kelapa; co-firing

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