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All Journal International Journal of Evaluation and Research in Education (IJERE) Jurnal Pendidikan Vokasi Jurnal Pendidikan Teknologi dan Kejuruan Jurnal Teknik Mesin Jurnal Pendidikan Teknik Mesin Journal of Education and Learning (EduLearn) Jurnal Pendidikan Teknik Mesin Teknika Otopro Journal of Educational Science and Technology Media Mesin: Majalah Teknik Mesin INVOTEC Jurnal Dimensi Pendidikan dan Pembelajaran Jurnal Pemberdayaan: Publikasi Hasil Pengabdian Kepada Masyarakat JIPI (Jurnal Ilmiah Penelitian dan Pembelajaran Informatika) EDUKATIF : JURNAL ILMU PENDIDIKAN Infotekmesin STEAM Engineering : Journal of Science, Technology, Education And Mechanical Engineering Otopro Edunesia : jurnal Ilmiah Pendidikan Indonesian Journal of Engineering and Technology (INAJET) Automotive Experiences Journal of Mechanical Engineering, Science, and Innovation Jurnal Pendidikan Sultan Agung Jurnal Polimesin Jurnal Rekayasa Mesin Automotive Innovations Journal
WARJU
Universitas Negeri Surabaya
Religion Aerospace Engineering Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Evaluating the Impact of Alternative Material-Based Catalytic Converters on Automotive Exhaust Emissions Ariyanto, Sudirman Rizki; Warju, Warju; Arifianti, Lailatus Sa'diyah Yuniar; Komarudin, Komarudin; Nugraha, Ata Syifa'
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 1 (2025): (April)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i1.7287

Abstract

Pollution air in cities in Indonesia, such as Jakarta, Tangerang, and Bandung, is especially caused by exhaust emissions from vehicle motorized, like carbon monoxide (CO) and hydrocarbons (HC), which originate from burning material burn the ones that don't perfect. Technological catalytic converters are used to reduce emissions, but converters made from metal have their own cost. This study evaluates exhaust Metallic Catalytic Converter (MCC) technology with alternative materials copper (Cu). The result shows that the MCC Cu exhaust system is significantly more effective in reducing CO and HC emissions compared with exhaust without the original equipment manufacturer (OEM) catalyst and exhaust. The average CO emissions are 2.13 %Vol and HC emissions are 198 ppmVol, lower compared to the second type of exhaust. Findings This shows that MCC Cu exhaust is not only more effective in reducing danger but is also more economical compared to catalytic converters made from metal noble, offering a solution sustainable and affordable for problem pollution air from vehicles.
The Influence of Critical Thinking Skills and Inquiry Skills on the Biosolar Innovation Ability of Class X Students TKR Skills Competency at SMKN 1 Jiwan Lestari, Yoni Dwi; Harimurti, Rina; Warju, Warju; Anifah, Lilik; Buditjahjanto, I Gusti Putu Asto
Jurnal Dimensi Pendidikan dan Pembelajaran Vol 13: Special Issue No. 1 (2025)
Publisher : Universitas Muhammadiyah Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24269/dpp.v13iSI1.11131

Abstract

Critical thinking skills and inquiry skills are necessary for vocational school students to stimulate innovation abilities because vocational school graduates are prepared to immediately enter the world of work or create their jobs. The research goal is to analyze the influence of critical thinking skills and inquiry skills on the biosolar innovation abilities of class Light Vehicle Engineering students. It is a descriptive type of research that applies a quantitative method. It uses an ex-post de facto design. The population in this study was class X TKR  skill competency students at SMK Negeri 1 Jiwan, totaling 129 students. With a sample size of 98 students. This study used a simple random sampling technique. The measuring instrument used is a questionnaire with multiple linear regression analysis as the data analyzing technique. The results show that there is a significant partial and simultaneous influence of the critical thinking skills and inquiry skills variables on the biosolar innovation abilities of the class The suggestion from this research is that schools are expected to be able to adopt policies that can stimulate students' biosolar innovation abilities which are influenced by critical thinking skills and inquiry skills.
AUTOMOTIVE CIRCUIT SIMULATION: IMPROVING PRIOR KNOWLEDGE ABILITY AND PRACTICAL SKILL ACQUISITION IN THE VEHICLE BODY ELECTRICAL SYSTEM Umaroh, Susi Tri; Ariyanto, Sudirman Rizki; Warju, Warju
JIPI (Jurnal Ilmiah Penelitian dan Pembelajaran Informatika) Vol 10, No 3 (2025)
Publisher : STKIP PGRI Tulungagung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29100/jipi.v10i3.8762

Abstract

This research aims to analyze the improvement of cognitive and psy-chomotor abilities by integrating ACS (Automotive Circuit Simulation) in learning about vehicle body electrical systems. This research is quan-titative research with a quasi-experimental design with two groups, namely an experimental group and a control group. The data collected was analyzed using quantitative descriptive. The results of this research indicate that there are differences in prior knowledge and the acquisi-tion of practical skills among students who utilize ACS media as a learning tool for vehicle body electrical systems. Recommendations from this research include further integrating ACS into the curriculum, increasing the availability of digital learning resources, and providing additional training for educators to optimize the potential for inde-pendent and interactive learning for students through simulation. Thus, this article proposes an innovative solution to effectively support the development of students' knowledge and skills in the field of vehicle body electrical systems.
Optimizing copper catalytic converter designs for emission reduction in automatic motorcycles using grey relational analysis Sudirman Rizki Ariyanto; Warju Warju; Komarudin Komarudin; Ata Syifa' Nugraha; Susi Tri Umaroh
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6375

Abstract

Vehicle emissions remain a major environmental challenge in urban areas, particularly in developing countries like Indonesia, where motorcycles dominate transportation. Automatic motorcycles pose specific emission control difficulties due to their engine characteristics. This study experimentally evaluates six copper-metallic catalytic converter designs installed on a 150cc automatic motorcycle under idle and 3000 rpm conditions. Exhaust emissions of carbon monoxide (CO) and hydrocarbons (HC) were measured using a gas analyzer. Grey Relational Analysis (GRA) was employed to optimize the design parameters. The E3 design (curvature height: 4 mm, diameter: 54 mm, length: 100 mm) exhibited the best performance, reducing CO to 3.72% and HC to 539 ppm. Compared to standard designs, E3 improved emission reduction by 18–36%. These findings confirm that catalyst geometry significantly influences emission control and demonstrate the effectiveness of GRA in multi-parameter optimization. The results contribute to the development of efficient, affordable catalytic converters, supporting sustainable transportation and aligning with SDG 13 goals for climate action.
Analysis of middle semester exam subjects for Automotive Vehicle Chassis (AVC) to improve the implementation management of learning evaluation Umaroh, Susi Tri; Soeryanto, Soeryanto; Warju, Warju; Marniati, Marniati
Jurnal Pendidikan Vokasi Vol. 12 No. 1 (2022): February
Publisher : ADGVI & Graduate School of Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpv.v12i1.45472

Abstract

Entering the 21st century with the industrial revolution 4.0, the speed of progress in information and communication technology has become unstoppable. One of the most benefited from these advances in the world of education. Exploration of learning resources, and discussion forums, for the evaluation of learning can be done easily because of technological advances. Learning evaluation can use a digital platform, and it is very easy to analyze to improve the management of the implementation of learning evaluation. This study was conducted to analyze the mid-semester test instrument, which includes Higher Order Thinking Skills (HOTS) questions and is used to measure students' abilities in the subject of Automotive Vehicle Chassis (AVC) in the Department of Automotive Engineering) at SMK Dharma Bahari Surabaya, Indonesia. This research method is descriptive and quantitative. The sample in this study was 40 students. The mid-semester questions were given as many as 40 questions related to the mid-semester exam material using the Quizizz platform. Analysis of the items is carried out by using the Rasch model approach to obtain fit items. This analysis was carried out with the help of Winsteps 3.73 software. In this study, it was found that the instrument of the question that Person Reliability at mid-semester Automotive Vehicle Chassis (AVC) was 0.85 while item reliability was 0.86. The magnitude of Cronbach's Alpha is 0.86, so it can be used to evaluate learning in AVC subjects according to the Rasch model.
Exhaust Emission Control in Sport Motorcycles: A Comparison of Catalytic Converters with Alternative Metal Materials Warju, Warju; Ariyanto, Sudirman Rizki; Pratama, Muhammad Yandi
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4092

Abstract

In this modern era, motor vehicles have brought significant changes in human life. Faster and more efficient mobility has increased connectivity between regions, supported economic growth, and improved quality of life. However, increased mobility also means an increase in vehicle exhaust emissions, which contribute to climate change and air pollution. One effective technology for controlling exhaust emissions is the use of catalytic converters. Metal catalytic converters, such as copper, brass, and chrome-plated copper, have been researched as more affordable and effective catalyst alternatives. This research aims to analyze the optimal design of exhaust systems with catalytic converters among three types of alternative materials (copper, brass, and chrome-plated copper) as well as standard exhaust systems without catalysts (STD NC) and standard platinum group metal exhaust systems (STD PGM) in maximizing the reduction of motor vehicle exhaust emissions. An experimental research design was used by utilizing a 2015 Yamaha Vixion Lightning as the research object. Catalytic converters were prepared with specific specifications to ensure consistency and accuracy in measurements. CO (carbon monoxide), HC (hydrocarbons), CO2 (carbon dioxide), and O2 (oxygen) emissions were analyzed using an Exhaust Gas Analyzer. The research results indicate that the CuCr sample exhibits excellent performance in reducing CO and HC emissions. The CuCr sample has an average CO emission of 4.09% Vol with a standard deviation of 1.46, demonstrating good consistency in CO emissions. Meanwhile, the average HC emissions from the CuCr sample are 320 ppmVol with a standard deviation of 106, indicating good consistency in HC emissions. All samples meet the emission standards set by the government, except for the STD NC sample, which exceeds the CO emission threshold.
The Effects of Responsibility and Empathy on Customer Satisfaction in Teaching Factory Learning Sudrajat, Surya Catur; Buditjahjanto, I Gusti Putu Asto; Warju, Warju
Edunesia : Jurnal Ilmiah Pendidikan Vol. 6 No. 1 (2025)
Publisher : research, training and philanthropy institution Natural Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51276/edu.v6i1.1142

Abstract

Vocational education encourages students to achieve competency in order to make students more prepared when joining the world. In order to achieve this goal, vocational education applies the model of a teaching factory. In factory learning, students are taught to provide direct services and products suitable for sale to general consumers or the public. Fundamental values ​​such as responsibility, empathy, and cooperation in service to society are the keys to this learning. The research aims to determine the simultaneous influence of responsibility and empathy on customer satisfaction in teaching factory learning at UPJ Vehicle Engineering Vocational High School 1 Bendo. The research used a sample of 67 class XII students at Vocational High School 1 Bendo using a Likert scale questionnaire with instrument validity test results using V-Aiken and reliability testing using Cronbach alpha. The research uses multiple linear regression analysis for the independent variables (responsibility and empathy) and the dependent (customer satisfaction) variables. The results of the Anova significance research were 0.000, and the calculated F value was 358.402. Then, the R2 value was 0.964. This shows that responsibility and empathy significantly influence customer satisfaction, with a percentage of 96.4%. Hopefully, this research can become the basis for further policy-making.
The Influence of Critical Thinking Skills and Inquiry Skills on the Biosolar Innovation Ability of Class X Students TKR Skills Competency at SMKN 1 Jiwan Lestari, Yoni Dwi; Harimurti, Rina; Warju, Warju; Anifah, Lilik; Buditjahjanto, I Gusti Putu Asto
JURNAL DIMENSI PENDIDIKAN DAN PEMBELAJARAN Vol 13: Special Issue No. 1 (2025)
Publisher : Universitas Muhammadiyah Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24269/dpp.v13iSI1.11131

Abstract

Critical thinking skills and inquiry skills are necessary for vocational school students to stimulate innovation abilities because vocational school graduates are prepared to immediately enter the world of work or create their jobs. The research goal is to analyze the influence of critical thinking skills and inquiry skills on the biosolar innovation abilities of class Light Vehicle Engineering students. It is a descriptive type of research that applies a quantitative method. It uses an ex-post de facto design. The population in this study was class X TKR  skill competency students at SMK Negeri 1 Jiwan, totaling 129 students. With a sample size of 98 students. This study used a simple random sampling technique. The measuring instrument used is a questionnaire with multiple linear regression analysis as the data analyzing technique. The results show that there is a significant partial and simultaneous influence of the critical thinking skills and inquiry skills variables on the biosolar innovation abilities of the class The suggestion from this research is that schools are expected to be able to adopt policies that can stimulate students' biosolar innovation abilities which are influenced by critical thinking skills and inquiry skills.
Analisis Perbandingan Konsumsi Bahan Bakar: Pertamax vs Shell Super vs BP 92 pada Motor 4 Langkah Anwari, Muhammad Syahrul Anwari; Athirmidzi, Falah Athirmidzi; Manathan, Yoel Andrew Manathan; Prayata, Muhammad Tharieq Prayata; Ariyanto, Sudirman Rizki Ariyanto; Warju, Warju; Abdi, Ferly Isnomo Abdi
Automotive Innovations Journal Vol. 1 No. 1 (2025): March
Publisher : Department of Automotive Engineering Technolgy

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

Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh penggunaan tiga jenis bahan bakar, yaitu Pertamax, Shell Super, dan BP 92, terhadap efisiensi konsumsi bahan bakar, performa mesin, dan emisi gas buang pada sepeda motor Yamaha Mio Sporty 2008. Metode penelitian yang digunakan adalah eksperimental dengan mengukur konsumsi bahan bakar (dalam satuan liter/jam) dan waktu habisnya bahan bakar pada rentang putaran mesin 1000-5000 RPM menggunakan fuelmeter, tachometer, dan stopwatch. Pengujian dilakukan secara berulang untuk memastikan keakuratan data. Hasil penelitian menunjukkan bahwa Pertamax memiliki efisiensi tertinggi pada putaran mesin rendah (RPM 1000), dengan waktu konsumsi bahan bakar terlama. Namun, pada RPM menengah dan tinggi (2000-5000), BP 92 menunjukkan pembakaran yang lebih cepat tetapi kurang efisien. Shell Super mencatat konsumsi bahan bakar yang stabil di berbagai tingkat RPM, menunjukkan konsistensi yang baik. Secara keseluruhan, Pertamax direkomendasikan untuk penggunaan sehari-hari pada putaran mesin rendah, Shell Super untuk berbagai kondisi RPM, sedangkan BP 92 kurang optimal untuk penggunaan jangka panjang, terutama pada RPM tinggi. Temuan ini menekankan pentingnya pemilihan bahan bakar sesuai karakteristik mesin dan kebutuhan pengguna, serta perlunya penelitian lanjutan untuk mengoptimalkan komposisi bahan bakar guna meningkatkan efisiensi dan mengurangi dampak lingkungan.
Analisis Efektivitas Kebisingan pada Sepeda Motor Menggunakan Sound Level Meter SNDW SW-524 Alam, Ruumy Bahrul Alam; Firmansyah, Lutfi Setiawan Firmansyah; Ariyanto, Sudirman Rizki Ariyanto; Warju, Warju; Abdi, Ferly Isnomo Abdi; Widoretno, Yustin Setiya Widoretno
Automotive Innovations Journal Vol. 1 No. 1 (2025): March
Publisher : Department of Automotive Engineering Technolgy

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

Abstract

Kebisingan yang dihasilkan oleh sepeda motor telah menjadi masalah serius di daerah perkotaan, terutama di Indonesia, di mana sepeda motor merupakan sarana transportasi utama. Penelitian ini bertujuan untuk menganalisis tingkat kebisingan yang dihasilkan oleh tiga jenis sepeda motor (bebek, matic, dan sport) pada berbagai tingkat putaran mesin (RPM) menggunakan Sound Level Meter (SLM). Metode penelitian yang digunakan adalah eksperimental kuantitatif dengan pengukuran kebisingan berdasarkan standar ISO 5130:2019. Hasil penelitian menunjukkan bahwa sepeda motor sport menghasilkan kebisingan tertinggi (rata-rata 95,54 dBA), terutama pada RPM tinggi, sementara sepeda motor bebek menghasilkan kebisingan terendah (rata-rata 77,80 dBA) dengan fluktuasi yang lebih stabil. Temuan ini mengindikasikan perlunya inovasi teknologi peredam kebisingan, terutama untuk sepeda motor sport, guna memenuhi standar kebisingan yang ditetapkan dan mengurangi dampak negatif terhadap lingkungan dan kesehatan masyarakat.
Co-Authors 'Ilmi, Muhammad Iklil Ulil Abdi, Ferly Abdi, Ferly Isnomo Abdi ADI TRISNA, RIO Al Fahrurrozi, Mochammad Arya Alam, Ruumy Bahrul Alam Anggara Ardiyanta Anggara Sukma Ardiyanta ANGGRAINI, BAGUS Anwari, Muhammad Syahrul Anwari, Muhammad Syahrul Anwari Arifianti, Lailatus Arifianti, Lailatus Sa'diyah Yuniar Ariyanto, Sudirman Rizki Ariyanto, Sudirman Rizki Ariyanto Arya Mahendra Sakti Ata Syifa’ Nugraha Athirmidzi, Falah Athirmidzi Bagas Surya Hadi Buitjahjanto, I Gusti Putu Asto Diah Wulandari Diastian Vinaya Wijanarko Diastian Vinaya Wijanarko Djoko Sungkono(2) Drastiawati, Novi Dyah Riandadari FAIQOTIN NISA, IHDAA Ferly Isnomo Abdi Firlani, Tony Firman Yasa Utama Firmansyah, Lutfi Setiawan Firmansyah Ganda, Andita Nataria Fitri Hamdani, Riza Arif HANDIWI, RIA Haratama, Kusuma Refa Hidayatullah, Rachmad Syarifudin I Gusti Putu Asto Buditjahjanto I Made Muliatna I Made Muliatna Ibisono, Gigih Chandra IHSAN NURKHAKIM Isnantyo, Fajar Danur Jahjanto, I Gusti Putu Asto Jarot Danang Priambodo Komarudin Komarudin Komarudin Komarudin Lestari, Yoni Dwi Lilik Anifah Manathan, Yoel Andrew Manathan Marniati Marniati, Marniati Melinda Astuti Muhammad Nurtanto Muhammad Pratama Muhammad Yandi Pratama Mutohhari, Farid Novi Sukma Drastiawati Nugraha, Ata Syifa' Nur Kholifah Nuur Wachid Abdul Majid Pratama, Muhammad Yandi Prayata, Muhammad Tharieq Prayata Priambodo, Jarot Danang Putu Sudira Rabiman, Rabiman Rachmad Syarifudin Hidayatullah Ria Handiwi Rina Harimurti Rio Adi Trisna ROJIL GHUFRON, MOCHAMMAD RUSY ANADY, NOVY Soeryanto Soeryanto Soeryanto Soeryanto Soeryanto Soeryanto Soffan Nurhaji Supari Muslim Supari Muslim Surya Catur Sudrajat, Surya Catur Susi Tri Umaroh Susi Tri Umaroh Suyitno Suyitno TRI UMAROH, SUSI Trisna, Rio Adi Ulfiyah, Laily Umaroh, Susi Umaroh, Susi Tri Wahyu Cahyadi Wahyu Robby Cahyadi Widoretno, Yustin Widoretno, Yustin Setiya Widoretno Wiyanto, Theodorus Yelma Dianastiti Zainal Arifin