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All Journal International Journal of Renewable Energy Development IPTEK The Journal of Engineering IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Indonesian Journal of Science and Technology INVOTEK: Jurnal Inovasi Vokasional dan Teknologi JURNAL PENDIDIKAN TAMBUSAI Jurnal Ilmiah Pendidikan Profesi Guru Ensiklopedia of Journal Edumaspul: Jurnal Pendidikan EDUTEC : Journal of Education And Technology Journal of Applied Engineering and Technological Science (JAETS) PAKAR Pendidikan Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Teknomekanik JPTE: Jurnal Pendidikan Teknik Elektro AEEJ : Journal of Automotive Engineering and Vocational Education JMES The International Journal of Mechanical Engineering and Sciences Mechanical Engineering for Society and Industry Automotive Experiences Jurnal Vokasi Mekanika Journal of Scientech Research and Development MASALIQ: Jurnal Pendidikan dan Sains Al-DYAS : Jurnal Inovasi dan Pengabdian kepada Masyarakat International Journal of Renewable Energy Development Journal of Innovative and Creativity Journal of Civil Engineering and Vocational Education Mars: Jurnal Teknik Mesin, Industri, Elektro dan Ilmu Komputer
Dori Yuvenda
Departemen Teknik Mesin, Universitas Negeri Padang
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Kontribusi Motivasi Kerja, Disiplin Kerja dan Pengembangan Karier Terhadap Kinerja Guru di SMK Negeri 1 Ranah Batahan Rahmadona, Tiwi; Maksum, Hasan; Indrawan, Eko; Yuvenda, Dori
Jurnal Ilmiah Pendidikan Profesi Guru Vol 4, No 3 (2021): November
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jippg.v4i3.38647

Abstract

Kurang optimanya kinerja guru dapat dilihat dari belum kurangnya kuantitas dan kualitas kerja sesuai target yang diharapkan, serta kecepatan dan ketepatan pelaksanaan pekerjaan. Penelitian ini bertujuan untuk mengukur kontribusi motivasi kerja, disiplin kerja, dan pengembangan karier secara bersama-sama terhadap kinerja guru SMK. Penelitian ini merupakan jenis deskriptif korelasional dengan jumlah populasi dalam penelitian yakni sebanyak 67 orang guru SMK. Penarikan sampel penelitian dilakukan dengan teknik total sampling, yakni dimana seluruh jumlah populasi dijadikan sebagai sampel penelitian. Pengumpulan data dilakukan dengan menggunakan teknik wawancara, observasi dan angket. Adpaun instrument penelitian yang digunakan yakni berupa lembar kuisioner Skala Likert. Teknik analisis data diantaranya korelasi dan korelasi berganda. Hasil penelitian menunjukkan bahwa Motivasi kerja berkontribusi terhadap kinerja guru sebesar 10,18%. Disiplin kerja berkontribusi terhadap kinerja guru sebesar 21,07%. Pengembangan karir berkontribusi terhadap kinerja guru sebesar 18,23%. Serta Motivasi kerja, disiplin kerja dan pengembangan karir berkontribusi bersama-sama terhadap kinerja guru sebesar 43,6%. Berdasarkan hasil penelitian tersebut dapat disimpulkan bahwa motivasi kerja, disiplin kerja dan pengembangan karir secara bersama-sama memberikan kontribusi terhadap kinerja guru Sekolah Menengah Kejuruan.
ANALISIS KEKUATAN PEGAS PRESSURE REDUCER SEBAGAI PENURUNAN TEKANAN PADA MESIN DUEL FUEL Dori Yuvenda; Bambang Sudarmanta; Erzeddin Alwi
invotek Vol 17 No 2 (2017): INVOTEK: Jurnal Inovasi, Vokasional, dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (352.742 KB) | DOI: 10.24036/invotek.v17i2.68

Abstract

Pressure reducer merupakan komponen utama pada conversion kit pada mesin bahan bakar ganda (duel fuel engine) yang berfungsi sebagai penurun tekanan pada bahan bakar compressed Natural gas dari tangki sebesar ± 250 bar menjadi tekanan kerja pada injektor gas sebesar ± 2 bar, sehingga menyebabkan kekurangan pasokan jumlah bahan bakar dari pressure reducer yang berpengaruh tethadap penurunan performa mesin, baik pada saat perubahan putaran mesin secara tiba-tiba maupun perubahan beban mesin. Mengatasi permasalah tersebut maka diperlukan upaya untuk meningkatkan performa pressure reducer agar lebih adaptif terhadap perubahan kondisi mesin. Salah satu upaya yang dilakukan untuk peningkatan performa tersebut adalah menambah kekuatan konstanta pegas pada area chamber stage dua pressure reducer. Penelitian ini menggunakan mesin Diamond tipe DI 800 dengan sistem dual fuel model indirect injection. Metode yang dilakukan adalah menvariasikan kekuatan konstanta pegas (25,55 N/m, 26,55 N/m, dan 27,55 N/m). Hasil terbaik didapatkan pada konstanta pegas 27,55 N/m terjadi peningkatan jumlah laju aliran gas (mass flow rate) pada saluran keluar (outlet gas pressure reducer) sebesar 7,42%. Hal ini menunjukkan terjadi peningkatan performa pressure reducer pada saat penambahan kontanta pegas pada stage dua
Pengaruh Tekanan Injeksi Gas Terhadap Konsumsi Bahan Bakar dan Efisiensi Termal pada Mesin Diesel Dual Fuel Dori Yuvenda; Bambang Sudarmanta; Randi Purnama Putra; Martias Martias; Erzeddin Alwi
invotek Vol 19 No 1 (2019): INVOTEK: Jurnal Inovasi, Vokasional, dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (788.182 KB) | DOI: 10.24036/invotek.v19i1.349

Abstract

Penggunaan compressed natural gas (CNG) sebagai bahan bakar utama pada mesin diesel menyebabkan penurunan performa mesin terutama pada efisiensi termal. Hal ini dikarenakan peningkatan daya mesin yang dikonversi melalui proses pembakaran tidak sebanding dengan penambahan jumlah bahan bakar yang masuk ke dalam ruang bakar seiring dengan penambahan beban mesin. Tujuan dari penelitian ini adalah bagaimana mengoptimalkan tekanan injeksi gas CNG yang diinjeksikan ke dalam ruang bakar melalui port (intake manifold) dapat menurunkan konsumsi bahan bakar dan meningkatkan efisiensi termal pada mesin diesel dual fuel (DDF). Metode penelitian ini dilakukan secara eksperimen pada mesin DDF Diamond DI 800 dengan putaran konstan (1500 rpm). Variasi yang dilakukan adalah mengatur tekanan injeksi gas CNG yang masuk melalui port sebesar 1,5 bar, 2 bar dan 2,5 bar. Hasil yang diperoleh adalah pada tekanan injeksi gas CNG 2,5 bar dapat memberikan persentase subtitusi gas CNG rata rata sebesar 57,59%, sedangkan pada tekanan injeksi gas CNG 1,5 bar dapat menurunkan konsumsi bahan bakar spesifik (SFCdual) hingga sebesar 0,196 kg/HP.jam dan meningkatkan efisiensi termal rata-rata sebesar 3,57% dibandingkan dengan variasi lain, meskipun masih di bawah kondisi operasi mesin single fuel.
Karakteristik Aliran pada Saluran Udara dengan Penambahan Square dan Circular Turbulator di Dekat Silinder Sirkular Tunggal Randi Purnama Putra; Bahrul Amin; Dori Yuvenda; Nuzul Hidayat
invotek Vol 19 No 1 (2019): INVOTEK: Jurnal Inovasi, Vokasional, dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (549.006 KB) | DOI: 10.24036/invotek.v19i1.351

Abstract

Penggunaan silinder sirkular banyak ditemukan pada bentuk kontruksi aplikasi teknik seperti; heat exchanger, struktur penyangga anjungan lepas pantai, jembatan dermaga, sistem perpipaan dan sebagainya. Di dalam beberapa aplikasi teknik, silinder sirkular ditempatkan di dalam saluran dengan berbagai pengaturan. Penggunaan silinder sirkular di dalam saluran tentunya mengakibatkan perbedaan karakteristik aliran dan membuat bertambahnya pressure drop. Penelitian ini bertujuan melihat karakteristik aliran dengan penggunaan variasi turbulator didekat silinder sirkular. Karakteristik aliran yang di tinjau adalah pressure drop, distribusi tekanan pada silinder sirkular dan Koefisien drag pressure. Penelitian dilakukan secara eksperimen. Turbulator ditempatkan di depan dari silinder sirkular. Turbulator yang digunakan berbentuk square dan circular cylinder. Saluran udara memiliki penampang bujur sangkar dengan luas penampang 125 x 125 mm. Rasio blockage sebesar 36,4 %. Variasi posisi sudut turbulator adalah dengan sudut α = 200, 300, 400, 500, dan 600. Pengujian dilakukan pada Reynolds number 11,6 x 104 (Re berdasarkan diameter hidrolik). Hasil dari penelitian menunjukkan penggunaan square turbulator lebih efektif mereduksi pressure drop pada saluran dibandingkan circular turbulator. Variasi posisi sudut square turbulator yang efektif mereduksi pressure drop ada pada sudut α = 300. Reduksi pressure drop pada sudut ini sebesar 23,33 %. Separasi aliran pada silinder sirkular terjadi pada sudut 1100 dan koefisien drag pressure sebesar 0,62.
Pengaruh Aplikasi Teknologi EGRICS Tipe Cold terhadap Emisi Asap pada Mesin Diesel Wagino Wagino; Toto Sugiarto; Dori Yuvenda; Randi Purnama Putra; Ahmad Arif
invotek Vol 20 No 2 (2020): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v20i2.716

Abstract

Emisi mesin diesel sangat berbahaya bagi kesahatan manusia adalah nitrogen oksida (NOx). Emisi NOx dsebabkan oleh temperatur mesin yang sangat tinggi. Salah satu upaya yang efektif untuk menurunkan emisi NOx adalah mengembalikan gas buang untuk dibakar kembali yang diistilahkan dengan exhaust gas recirculation (EGR). Namun, dengan metode EGR meningkatkan emisi asap pada mesin diesel. Penelitian ini dilakukan pada mesin diesel empat langkah dengan menggunakan sistem EGR metode injeksi (EGRICS) tipe cold. Parameter penelitian dengan menvariasikan durasi injeksi EGR yang diinjeksikan ke silinder melalui saluran masuk yaitu 15 ms, 20 ms dan 25 ms dengan putaran 800-2000 rpm dengan interval 200. Hasil penelitian menunjukkan bahwa dengan sistem EGRICS tipe cold pada mesin diesel menghasilkan emisi asap yang paling rendah dengan durasi injeksi sebesar 15 ms pada setiap putaran mesin. Penggunaan EGRICS tipe cold juga lebih efisien dibandingkan dengan hot EGR karena kenaikan emisi asap pada EGRICS tipe cold lebih rendah daripada hot EGR yaitu sebesar 18,5 % sehingga dapat menurunkan kadar NOx yang terbentuk pada gas buang mesin diesel.
Contribution of Learning Motivation and Learning Attitude to Student Learning Outcomes in Digital Simulation Courses Mulya Melda; Hasan Maksum; Eko Indrawan; Dori Yuvenda
EDUTEC : Journal of Education And Technology Vol 4 No 3 (2021): March 2021
Publisher : STAI Miftahul Ula Nganjuk

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29062/edu.v4i3.190

Abstract

The background of this research is the low value of students in digital simulation courses of Informatics Engineering education and Computer Education FKIP UBH. Based on the data of the last three years, that the value of students under 70 reached 50%. The purpose of this study is to find out how much contribution: (1) motivation to learn on student learning outcomes in digital simulation courses ptik study program FKIP UBH Padang City, (2) attitude of learning to the results of learning in digital simulation courses ptik study program FKIP UBH Padang City, and (3) learning motivation and attitude of learning together to the results of learning students in the course Digital Simulation study program PTIK FKIP UBH Padang City. This research is quantitative research with correlational type. The research population was 39 students. The sampling technique uses the Total Samplingtechnique, which means that the sample has the same number as the population. Data on learning motivation and learning attitudes were obtained through questionnaires using the Likertscale, while data on student learning outcomes in Digital Simulation courses were obtained from the final score of the even semester of FY 2019/2020. The data in the analysis uses statistical methods with the help of SPSS software version 17. The results of the data analysis showed that (1) there was a positive and significant relationship of learning motivation to student learning outcomes with a correlation coefficient of 0.531, thus contributing 28.20%. (2) Then, there is a positive and significant relationship between the attitude of learning towards student learning outcomes with a correlation coefficient of 0.559, thus contributing 31.25%. (3) Furthermore, there is a positive and significant relationship between learning motivation and learning attitudes together with student learning outcomes with a correlation coefficient of 0.657 thus contributing 43.16%. This proves that learning motivation and learning attitudes contribute strongly in improving student learning outcomes in the Digital Simulation course of PTIK FKIP UBH study program in Padang City.
Effects of Pilot Injection Timing on The Engine Performance of A Diesel Dual Fuel Engine Jose da Silva; Dori Yuvenda; Bambang Sudarmanta
IPTEK The Journal of Engineering Vol 5, No 2 (2019)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v5i2.a5014

Abstract

The combustion process in dual fuel diesel engines occurs sequentially starting with premix burning. The premix burning starts with the ignition delay process. The presence of CNG causes the ignition delay process to become longer, thereby reducing engine performance and increasing emissions on dual fuel diesel engines. This study uses diesel engine type Diamond DI 800 with dual fuel indirect injection model system. The method used a variation of diesel pilot injection timing 110 CA, 130 CA, 150 CA, 170 and 190 CA BTDC. Testing is done with a constant engine speed of 1500 rpm and loading 500 to 3000 watts with 500-watt intervals. The results show that by advancing the diesel pilot injection timing where brake horsepower and the average effective pressure between single fuel and dual fuel is not too far as the current and voltage changes generated by the generator are not too small. While optimal thermal efficiency increased by 4.11%, while CO and HC emissions decreased respectively by 10.85%  and 8.28% at occurred at the pilot injection timing 170 CA BTDC but still under the single fuel engine.
The Effect of Addition Electrical Supercharger on Diesel Dual Fuel Engine with Variation of Air Mass Flow Rate to The Engine Performance and Emissions Jamaludin Jamaludin; Dori Yuvenda; Bambang Sudarmanta
IPTEK Journal of Proceedings Series No 1 (2019): 4th International Seminar on Science and Technology 2018 (ISST 2018)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (568.065 KB) | DOI: 10.12962/j23546026.y2019i1.5262

Abstract

Diesel Dual fuel system is a diesel operated by using dual fuel CNG and diesel fuel as a pilot fuel. The problem that often occurs in dual fuel system is the reduced ratio of air and fuel. This causes the thermal efficiency to be lower. So in this study mounted electric supercharger as an air supply for performance and efficiency, and emissions from diesel engines better. This research uses diesel engine type Diamond Di 800 with dual fuel indirect injection model system. The method used is to vary the air mass flow rate (ṁ) through intake manifold to the combustion chamber 0.0063 kg/s, 0.0072 kg/s, 0.0077 kg/s, 0.0087 kg/s, and 0.0095 kg/s by adjusting the voltage on electric supercharger 8V, 9V, 10V, 11V, and 12V. Measurements are made to: the current and the voltage of each load, the consumption time of 25 ml diesel fuel, and the exhaust emissions (CO, HC, and PM). The best result was found that the addition of air mass flow rate (ṁ) to dual fuel system had no significant effect on the engine's effective power, torque, Bmep when compared with single fuel. The addition of air mass flow rate (ṁ) 0.0087 kg/s can substitution the diesel fuel by 56.45%, thermal efficiency increased by 33.57% but under single fuel condition, and increase the average AFR by 64.31%. The average CO and HC emissions decreased by 15.18% and 62.35% even though they were under single fuel condition, while the PM emissions increase with increasing loads but compared to single fuel decreased by 75%
The Effects CNG Injection Timing on Engine Performance and Emissions Of A Diesel Dual Fuel Engine Moch. Aziz Kurniawan; Dori Yuvenda; Bambang Sudarmanta
IPTEK The Journal for Technology and Science Vol 30, No 2 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (599.82 KB) | DOI: 10.12962/j20882033.v30i2.4996

Abstract

Sequential combustion process on diesel dual fuel engine with compressed natural gas (CNG) fuel was complex. The problems of diesel dual fuel with CNG gas are reduced thermal efficiency and resulting in high carbon monoxide (CO) and unburned hydrocarbon (HC) emissions. The right setting between combustion air, diesel pilot fuel, and CNG gas fuel can improvement the performance and emissions. The experiment was conducted with diesel fuel conventional and dual fuel mode with CNG fuel in a single cylinder, four strokes, constant speed (1500 rpm) diesel engine type diamond DI 800. Performance parameters such as thermal efficiency and specific fuel consumption (SFC), emissions such as CO, HC, and smoke density are determined at five starts of injection timing (SOI) CNG of 700CA, 900CA, 1100CA, 1300CA, dan 1500CA ATDC with ECU programmable of Vemstune software. The results indicated that retarded CNG injection timings improved engine performance and emissions diesel dual fuel. Start of CNG injection timing optimization at 1300CA ATDC with increased thermal efficiency 14,35% and decreased specific fuel consumption (SFC) 8,83 % . in addition, it decreased CO emissions 21,35%, HC emissions 17,93%, and PM emissions lower 34,98%. However, engine performance diesel dual fuel lower than a conventional diesel engine.
Body City Car Design of Two Passengers Capacity: A Numerical Simulation Study Randi Purnama Putra; Dori Yuvenda; Muji Setiyo; Andrizal Andrizal; Martias Martias
Automotive Experiences Vol 5 No 2 (2022)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.6304

Abstract

A city car is needed to overcome congestion and parking spaces in urban areas. However, currently, the body design of the city car is still experiencing problems, namely the value of the large drag coefficient, which causes an increase in fuel consumption. This study aims to design a city car body with two passengers that is more aerodynamic so as to minimize fuel use. This research method is a numerical simulation model using the ANSYS fluent students version 2021. Parameters in the form of drag coefficient values, velocity streamlines and velocity contours on the city car are aerodynamic aspects that are analyzed. The results show that the dimensions of the designed city car have a length of 2.59 m, a width of 1.6 m, and a height of 1.52 m by considering the ergonomic parameters and comfort of the user so that it fits the character of the people in Indonesia. In addition, from the independence grid analysis performed, the value of the number of meshes that have the smallest error value is obtained, namely mesh C (the number of meshes is 129,635). Mesh C has an error of 7.2%. It was found that as the velocity increases, the value of the drag coefficient (CD) produced is relatively smaller. In a city car with a velocity of 10 m/s, the drag coefficient value is 0.599, at a velocity of 20 m/s, the drag coefficient value is 0.594, and a velocity of 30 m/s is a drag coefficient value of 0.591.
Co-Authors Abdu Idham Aditya Kolakoti Agia Kulkarni Preti Ahmad Arif Ahmad Arif Ajib Jihadal Mahmud Al Munawir Alper Calam Anaperta, Yoszi Mingsih Andre Kurniawan Andre Kurniawan Andri, Rezky Andrizal Andrizal Aprinaldi, Aprinaldi Ari Kurniawan Arif Wahjudi Arwizet Arwizet, Arwizet Asnil Asnil Aswardi Aswardi Azis, Ismail Azuan Ahmad Bahrul Amin Bambang Sudarmanta Bambang Sudarmanta Bulkia Rahim Citra Dewi Dedi Setiawan Dedi Setiawan Eko Indrawan Erizon, Nelvi Erzeddin Alwi Fadhil Y Fancer Rumahorbo Faris Afif Fauza, Anna Niska Gusni Sushanti Hansi Effendi Haq, Syaiful Haris Yuliardiansyah Harmanto, Dani Hasan Maksum Hendra Dani Saputra Hendra Hidayat Hermi Zaswita I Gusti Bagus Wiksuana Irzal Irzal Jamaludin Jamaludin Jamaludin Jamaludin Jose da Silva Junil Adri Krismadinata Krismadinata Krismadinata Krismadinata, Krismadinata Kurnia, M. Chalid M. Nasir M. Yasep Setiawan M. Yasep Setiawan Madihah Mohd Saudi Maidi Saputra Martias Martias Martias Martias Masykur Masykur Milana Milana Moch. Aziz Kurniawan Muhammad Djoni Bustan Muhammad Jalil Muhammad Kunta Biddinika Muhammad Rifqi Muhibbudin Muhibbudin Muji Setiyo Muldi Yuhendri Mulianti Mulya Melda Muslim Muslim Muzakir Muzakir Nelvi Erizon Nor Azwadi Che Sidik Nurdin Hendri Nuzul Hidayat, Nuzul Oki Muraza Olusegun David Samuel Olusegun David Samuel Pribadyo Pribadyo Primawati Primawati Purwanto, Wawan Purwantono Purwantono purwantono purwantono Purwantono, Purwantono Putra, Randi Purnama Rahadian Zainul Rahmadona, Tiwi Rahmat Hidayat Raihan, Muhammad Randi Purnama Putra Ray Adhan Brieghtera Refdinal Refdinal Refdinal, Refdinal Remon Lapisa Remon Lapisa Ridho Illahi Ridho Nurmansyah Rifdarmon Rifdarmon Rifelino Rifelino Robert, Julio Rozy Aini Hirowati Sadri Arjono Setrihan Putra Sri Haryati Sri Rizki Putri Primandari Suroto Munahar Tarig Elshaarani Tiwi Rahmadona Toto Sugiarto Tuessi Ari Purnomo Veri Budiawan Arham Wagino Wagino Wagino Wanda Afnison Waskito Waskito Waskito, Waskito Yanto, Doni Tri Putra Yolli Fernanda Yus Donald Chaniago