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All Journal Jurnal Rekayasa Mesin SCIENCE TECH: Jurnal Ilmiah Ilmu Pengetahuan dan Teknologi Jurnal Mekanika dan Sistem Termal TEKIBA : Jurnal Teknologi dan Pengabdian Masyarakat
Joko Winarno
Universitas Janabadra
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemistry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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 1 
Studi Eksperimental Unjuk Kerja Campuran Solar-Biodiesel Minyak Jelantah Pada Mesin Diesel Ade Setiawan; Joko Winarno; Mochamad Syamsiro
Jurnal Mekanika dan Sistem Termal Vol 2, No 1: APRIL 2017
Publisher : Universitas Janabadra

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (709.435 KB)

Abstract

In this study, biodiesel fuel produced from waste cooking oil was blended in 20%, 30%, 40% and 50% with the commercial diesel fuel. The biodiesel was collected from a company near Yogyakarta city. It was produced from transesterification process in a commercial scale reactor. The diesel-biodiesel mixtures were tested in a four-cylinder and four-stroke diesel engine with the compression ratio of 18 and water cooling system. The results show that the thermal efficiency of diesel engine increased with increasing the engine speed. The present of biodiesel also increased the thermal efficiency of the diesel engine. A mixture of 40% (B40) and 50% (B50) biodiesel resulted in the highest thermal efficiency. The brake mean effective pressure also increased with increasing the engine speed and biodiesel mixture. The specific fuel consumption showed a decrease in its value as a function of engine speed. Low specific fuel consumption means the high thermal efficiency of the diesel engine.
Investigasi Kinerja Energi dan Eksergi Pengering Surya Konveksi Alamiah Terdistribusi dengan Media Penyimpan Panas Pasir Joko Winarno; Sri Gati Hutomo
Jurnal Rekayasa Mesin Vol 18, No 2 (2023): Volume 18, Nomor 2, Agustus 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i2.4097

Abstract

Dalam rangka ikut berperan serta dalam upaya mengembangkan sistem pengering surya, maka dalam penelitian akan dilakukan rancang bangun dan uji eksperimental kinerja energi dan eksergi sistem pengering surya konveksi alamiah tipe terdistribusi untuk proses pengeringan berbagai komoditi pertanian dan perkebaunan. Pengkajian terhadap kinerja energi sistem dimaksudkan untuk mengetahui pengatuh berbagai parameter  yang mempengaruhi kinerja energi sistem pengering surya seperti media absorber yang digunakan dalam proses pengeringan. Hasil penelitian menunjukkan bahwa  unit pengering yang dirancang dengan media penyimpan panas pasir dan kerikil mampu menaikkan temperatur ambien masing-masing sebesar 9.2 °C dan 3.07 °C pada proses pengeringan kacang. Penggunaan pasir sebagai media penyimpan pada unit pengering yang dirancang mampu menaikkan laju pengeringan kacang kedelai masing-masing sebesar sebesar 10,91% dan 57,69%. Besarnya perubahan eksergi aliran panas pada unit pengering mencapai 316172,1 J, dan semakin besar perubahan eksergi aliran udara yang melewati unit pengerin, maka laju pengeringan akan semakin meningkat.
Optimasi Distribusi Temperatur pada Mesin Pengering Makanan Untuk Usaha Mikro Kecil dan Menengah (UMKM) Istiadi, Firman; Winarno, Joko
Jurnal Mekanika dan Sistem Termal Vol 5, No 1 (2022): Jurnal Mekanika dan Sistem Thermal
Publisher : Universitas Janabadra

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Abstract

Sektor kuliner dalam UMKM tidak sedikit yang membutuhkan pengeringan dalam pembuatan produk yang menggunakan mesin pengering. Dalam penelitian ini akan dikaji mengenai optimasi pengering makanan dengan metode panas merata. Penelitian ini menggunkan 4 model sistem distribusi temperatur pada mesin pengering, yaitu dengan menggunakan satu lubang input panas, menggunakan 4 lubang input panas, menggunakan 4 lubang input panas dan penambahan sirip pada lubang input, kemudian menggunakan 4 lubang input panas beserta sirip pada lubang input panas dan penambahan sekat pada lubang output blower. Distribusi temperatur didapatkan secara optimal adalah dengan menggunakan 4 lubang input panas,  menggunakan  sirip  pada  lubang  input  panas,  dan  sekat  pada  lubang  output  pada  blower.  Hasil  eksperimen didapatkan adalah 80%-85% kadar air (pengujian 8 loyang) dan 41%-48% kadar air (pengujian 16 loyang) yang menguap dalam waktu 45 menit. Sedangkan eksperimen pengeringan kerupuk whey didapatkan laju pengeringan paling minimum terdapat pada loyang 8 dan loyang 10 dengan laju pengeringan 0,2426 gram/cm2 , sedangkan laju pengeringan maksimum terdapat  pada  loyang  1,  2,  12,  14,  15,  dan  16  dengan  laju  pengeringan  sebesar  0,3466  gram/cm2.jam  dengan  selisih maksimum laju pengeringan tiap loyang adalah 0,104 gram/cm2.jam Kata kunci: distribusi temperatur, mesin pengering, pengering makanan UMKM
Pengaruh Penambahan Lubang Rumah Kopling Serta Jenis Hidayah, Arif Nur; Winarno, Joko
Jurnal Mekanika dan Sistem Termal Vol 4, No 1 (2021): Jurnal Mekanika dan Sistem Thermal
Publisher : Universitas Janabadra

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Abstract

Kopling yaitu komponen mesin yang digunakan untuk menyalurkan tenaga dari pully ke roda belakang pada sepeda motor matik  . pada  tipe  ini  menggunakan  transmisi  otomatis  (model  v-belt)  dengan  mengandalkan  kopling  sentrifugal.  Pada motor matik bagian kopling sentrifugal sering menjadi pokok dari permasalahan motor getar pada awal kendaraan akan mulai bergerak. Sepeda motor honda vario 150cc pada jenis kopling standar pada rumah kampas ganda malah menjadi sarang dari kotoran dari kampas ganda yang seharusnya dihindari. Eksperimen kali ini peneliti ingin menaruh lubang pada sisi pojok rumah kopling yang diharapkan tidak berpengaruh pada keausan kampas kopling namun akan berfokus pada pembuangan kotoran yang selama ini sering mengendap pada sisi rumah kopling dan  menjadi penyebab utama motor matik getar,sedangkan untuk memperkecil tingkat slip pada kopling akan diberi sayatan pada kampas kopling. Sayatan lubang dan pelubangan pada rumah kopling dianggap paling baik untuk mengatasi masalah yang ada di karnakan torsi  meningkat 13,48% dan daya meningkat 15,1% dan memiliki nilai hasil pengujian terbaik diantara kedua jenis varian pada kampas kopling dan rumah kopling. Kata kunci: daya, kopling, sayatan, torsi
Pengaruh Penyetelan Sudut Toe dan Tekanan Ban Terhadap Hasil Uji Side Slip Tester pada Mikrobus Isuzu NLR 55B LX Ni Putu Yana Teja Pertiwi; Joko Winarno; Mochamad Syamsiro; Sri Gati Hutomo
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 12 No 2 (2026): August
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol12.no2.a22186

Abstract

Front wheel alignment and tire pressure are important factors affecting vehicle stability, comfort, and driving safety during operation. This study aimed to analyze the effect of toe angle adjustment and tire pressure variation on side slip test results in the Isuzu NLR 55B LX microbus. The research employed an experimental method conducted at the Motor Vehicle Testing Unit of the Department of Transportation of Magelang City using an HPA side slip tester manufactured in 2004. The experimental variables consisted of three toe angle variations (-0°25′, +0°15′, and +0°25′) and three tire pressure variations (35, 50, and 65 psi), while the front wheel deviation data were analyzed descriptively and comparatively. The results showed that non-standard toe angle and tire pressure settings produced side slip values exceeding the allowable roadworthiness threshold of ±5 mm/m, with the highest deviation reaching -14.7 mm/m under low tire pressure and below-standard toe angle conditions. In contrast, the standard toe angle setting (+0°15′) with a tire pressure of 50 psi produced a side slip value of 3.6 mm/m, which remained within the acceptable threshold. Both under-inflated and over-inflated tire conditions were found to increase wheel deviation due to changes in tire-road contact characteristics. This study confirms that proper toe angle adjustment and tire pressure settings play an important role in maintaining vehicle stability, improving driving safety, and extending tire service life.
Pengaruh Jenis Ban dan Tekanan Angin terhadap Efisiensi Pengereman pada Kendaraan Isuzu TBR 54: Pengaruh Jenis Ban dan Tekanan Angin terhadap Efisiensi Pengereman pada Kendaraan Isuzu TBR 54 Anis Prabandari; Joko Winarno; Mochamad Syamsiro
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 11 No 2 (2025): August
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol11.no2.a20165

Abstract

The braking system is a critical component in ensuring the safety of motor vehicles. Braking effectiveness is influenced by the condition of the braking components and supporting factors such as tire type and air pressure. Inappropriate selection of tires or incorrect air pressure can reduce tire grip on the road surface, leading to decreased braking efficiency. Based on this background, this study aims to analyze the effect of variations in tire type (bias and radial) and tire air pressure on the braking efficiency of the Isuzu TBR 54 vehicle. The research was conducted at the Motor Vehicle Testing Unit of the Department of Transportation in Magelang City using an experimental method. A Certus 2023 brake tester was employed to collect data. The variables tested included two types of tires and five different air pressure levels (25, 30, 32, 35, and 40 psi). Braking force data on both vehicle axles were collected and analyzed using SPSS software through normality tests, homogeneity tests, and t-tests to determine the significance of each variable’s influence. The results showed that tire type and air pressure significantly affect braking efficiency. Radial tires demonstrated better braking performance than bias tires across all pressure levels. Excessive air pressure reduced braking efficiency due to a decrease in the tire’s contact area with the road surface. The most optimal combination for braking efficiency is achieved with radial tires at an air pressure of 25–30 psi, which results in braking efficiency above 75%. These findings highlight the importance of selecting the appropriate tire type and maintaining proper air pressure to enhance vehicle safety and braking performance.
Sosialisasi dan Layanan Servis Sepeda Motor Gratis di Kelurahan Warungboto, Kemantren Umbulharjo, Kota Yogyakarta Muhammad Arief Saputro; Joko Winarno; Sukamto; Mochamad Syamsiro; Ardiyan Rhamadhani; Riki Ferdiansyah; Sahat Yansen Parulian Sinamo
TEKIBA : Jurnal Teknologi dan Pengabdian Masyarakat Vol. 6 No. 1 (2026): TEKIBA : Jurnal Teknologi dan Pengabdian Masyarakat (Januari)
Publisher : Fakultas Teknik, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/tekiba.v6i1.6811

Abstract

This community service program is an annual activity organized by the Department of Mechanical Engineering, Faculty of Engineering, Janabadra University, focusing on the provision of free motorcycle maintenance services accompanied by public education regarding routine vehicle care for residents living in and around Kalurahan Warungboto. The program aims to enhance the safety and reliability of local residents’ daily transportation through preventive maintenance and increased user technical literacy. The implementation methods include: (1) on-site registration of motorcycles at the Kalurahan Warungboto office, (2) initial inspection using a standardized checklist, (3) basic servicing such as oil changes, air filter cleaning, etc, and (4) brief socialization sessions on maintenance schedules, early signs of malfunction, and safe riding behaviors. The free service is carried out by lecturers and Mechanical Engineering students in the yard of the Kalurahan Warungboto office, allowing residents to easily access the service location and obtain direct consultation on the condition of their motorcycles. While participants wait, the team delivers structured educational materials to support independent vehicle care at home. Expected outcomes include improved functional condition of participant vehicles, increased public understanding of preventive maintenance, and strengthened achievement of student learning outcomes in both technical skills and service-oriented soft skills. The program’s implications include strengthened campus–community networks in Kalurahan Warungboto and the potential replication of the service model in other regions with support from local stakeholders. The community service program is an annual activity organized by the Department of Mechanical Engineering, Faculty of Engineering, Janabadra University, focusing on the provision of free motorcycle maintenance services accompanied by public education regarding routine vehicle care. The program aims to enhance the safety and reliability of local residents’ daily transportation through preventive maintenance and increased user technical literacy.
Co-Authors Ade Setiawan Anis Prabandari Ardiyan Rhamadhani Hidayah, Arif Nur Istiadi, Firman Mochamad Syamsiro Muhammad Arief Saputro Ni Putu Yana Teja Pertiwi Riki Ferdiansyah Sahat Yansen Parulian Sinamo Sri Gati Hutomo Sukamto