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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

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.

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

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.

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

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.

Combustion and Emission Characteristics of CNG-Diesel Dual Fuel Engine with Variation of Air Fuel Ratio Dori Yuvenda; Bambang Sudarmanta; Jamaludin Jamaludin; Oki Muraza; Randi Purnama Putra; Remon Lapisa; Krismadinata Krismadinata; Rahadian Zainul; Asnil Asnil; Muji Setiyo; Sri Rizki Putri Primandari
Automotive Experiences Vol 5 No 3 (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.7807

Compressed natural gas (CNG) is a popular alternative fuel because of its more environmentally friendly properties than fossil fuels , including applications in diesel engines. However, supplying too much compressed natural gas fuel causes poor engine performance and emissions due to a decrease in the air-fuel ratio on the dual-fuel engine. The addition of air using electric superchargers was done to return the air-fuel ratio to ideal conditions. Lambda value (λ) was variation under low load (1.52 to 2.71), medium load (1.18 to 2.17), and high load (0.94 to 2.17) on a CNG-diesel dual fuel engine. The addition of pure air in each load can increase combustion stability in certain lambda, which was indicated by an increase in thermal efficiency, heat release rate, and a decrease in ignition delay, combustion duration, hydrocarbon, and carbon monoxide emissions.

Pembuatan dan Penyediaan Alat Pengiris Bawang Merah untuk Pengusaha Skala Mikro di Kenagarian Talang Babungo, Kabupaten Solok, Sumatra Barat Anna Niska Fauza; Wanda Afnison; Randi Purnama Putra; Purwantono Purwantono; Andre Kurniawan; Hendri Nurdin
JPP IPTEK (Jurnal Pengabdian dan Penerapan IPTEK) Vol 7, No 1 (2023)
Publisher : LPPM ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jpp-iptek.2023.v7i1.3773

Bawang merah merupakan salah satu komoditas pertanian yang banyak dihasilkan di Indonesia. Salah satu daerah dengan hasil panen bawang merah yang cukup tinggi adalah Kenagarian Talang Babungo, Kabupaten Solok, Sumatra Barat. Saat ini, sudah mulai berkembang pengusaha-pengusaha berskala mikro dalam memproduksi makanan olahan bawang merah, yaitu bawang merah goreng. Hal ini telah menjadi salah satu sumber mata pencarian masyarakat di daerah tersebut. Bawang merah goreng menunjukkan potensi yang besar sebagai produk olahan pertanian dengan nilai jual yang tinggi. Selain itu, bawang merah goreng sangat populer di kalangan masyarakat karena keefektifan dan kekhasan cita rasanya. Namun, proses pembuatan bawang merah goreng di Kenagarian Talang Babungo masih dilakukan secara manual dan menggunakan alat sederhana. Sehingga, hal ini mengakibatkan rendahnya produktivitas kerja dan produk yang dihasilkan. Oleh karena itu, Teknik Mesin Universitas Negeri Padang memberikan solusi kepada pengusaha bawang merah dalam kegiatan Pengabdian Kepada Masyarakat. Tim Pengabdian merancang dan menyediakan mesin pengiris bawang merah melalui penggunaan teknologi tepat guna. Mesin pengiris bawang merah dirancang dengan menggunakan teknologi sederhana dan sistem operasional yang mudah digunakan. Mesin pengiris bawang dirancang menggunakan penggerak motor listrik dengan kapasitas produksi yang cukup besar, yaitu 20–30 kg/jam. Selain itu, mesin pengiris bawang merah memiliki keunggulan dalam pengaturan ketebalan pemotongan bawang merah yang dikehendaki. Diharapkan, melalui penyediaan mesin pengiris bawang merah yang inovatif tersebut akan mampu meningkatkan produktivitas kerja pengusaha bawang merah di Kenagarian Talang Babungo dengan estimasi ± 400% peningkatan hasil produksi dibandingkan dengan metode pengirisan secara manual. Hal ini juga akan mendorong peningkatan roda ekonomi dan kesejahteraan masyarakat setempat.

Implementation of project-based learning for improve students' critical thinking skills in creative product and entrepreneurship subjects Roza Febrianti; Yufrizal A; Randi Purnama Putra; Phonepasith Phongdala
Jurnal Pendidikan Teknologi Kejuruan Vol 6 No 4 (2023): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v6i4.34523

The implementation of monotonous learning that lacks active student participation can contribute to the low critical thinking skills of students. This research aims to enhance students' critical thinking skills through the application of project-based learning (PjBL). The study evaluates the extent to which students' critical thinking skills can be improved through the implementation of PjBL. The research employs a Quasi-Experimental method. The study subjects consist of two groups: the experimental group, which utilizes the PjBL, and the control group, which follows a conventional model. Overall, after conducting prerequisite tests and hypothesis testing, a significant difference in critical thinking scores is observed between the experimental and control groups. Students are provided with the opportunity to exercise their critical thinking skills during the execution of project tasks. Consequently, it can be concluded that the PjBL model positively impacts the essential thinking abilities of 11th-grade machanical engineering students in creative products and entrepreneurship subject.

Design and Crash Test on a Two-Passenger City Car Frame using Finite Element Method Putra, Randi Purnama; Yuvenda, Dori; Afnison, Wanda; Lapisa, Remon; Milana, Milana; Fauza, Anna Niska; Harmanto, Dani
Automotive Experiences Vol 7 No 2 (2024)
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.11306

The chassis is an important part of a car which must have a strong construction to withstand the weight of the vehicle. The purpose of this research is to create a city car's chassis that can hold two passengers and then crash-test the finished product. In this research, a development method was used using SolidWorks software and the student version of ANSYS R2 2023 as software for creating chassis designs and crash test simulations. The study's findings indicate that the car frame's measurements are 2.46 meters in length, 1.33 meters in height, and 1.39 meters in width. The steel of the ASTM A36 type was utilized as the material in the computational study of the frame. The results show that increasing speed causes an increase in deformation, with the peak deformation at a speed of 100 km/h. The maximum deformation occurs at 0.007 seconds with a value of 203.51 mm at the top pillar of the car. The deformation increases from 97.196 mm at 0.0035 s to 161.22 mm at 0.0056 s. However, deformation occurs mainly in the front zone of the car frame and is not significant in the passenger zone.

Pembuatan dan Penyediaan Alat Pengiris Bawang Merah untuk Pengusaha Skala Mikro di Kenagarian Talang Babungo, Kabupaten Solok, Sumatra Barat Fauza, Anna Niska; Afnison, Wanda; Putra, Randi Purnama; Purwantono, Purwantono; Kurniawan, Andre; Nurdin, Hendri
JPP IPTEK (Jurnal Pengabdian dan Penerapan IPTEK) Vol 7, No 1 (2023)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jpp-iptek.2023.v7i1.3773

Bawang merah merupakan salah satu komoditas pertanian yang banyak dihasilkan di Indonesia. Salah satu daerah dengan hasil panen bawang merah yang cukup tinggi adalah Kenagarian Talang Babungo, Kabupaten Solok, Sumatra Barat. Saat ini, sudah mulai berkembang pengusaha-pengusaha berskala mikro dalam memproduksi makanan olahan bawang merah, yaitu bawang merah goreng. Hal ini telah menjadi salah satu sumber mata pencarian masyarakat di daerah tersebut. Bawang merah goreng menunjukkan potensi yang besar sebagai produk olahan pertanian dengan nilai jual yang tinggi. Selain itu, bawang merah goreng sangat populer di kalangan masyarakat karena keefektifan dan kekhasan cita rasanya. Namun, proses pembuatan bawang merah goreng di Kenagarian Talang Babungo masih dilakukan secara manual dan menggunakan alat sederhana. Sehingga, hal ini mengakibatkan rendahnya produktivitas kerja dan produk yang dihasilkan. Oleh karena itu, Teknik Mesin Universitas Negeri Padang memberikan solusi kepada pengusaha bawang merah dalam kegiatan Pengabdian Kepada Masyarakat. Tim Pengabdian merancang dan menyediakan mesin pengiris bawang merah melalui penggunaan teknologi tepat guna. Mesin pengiris bawang merah dirancang dengan menggunakan teknologi sederhana dan sistem operasional yang mudah digunakan. Mesin pengiris bawang dirancang menggunakan penggerak motor listrik dengan kapasitas produksi yang cukup besar, yaitu 20–30 kg/jam. Selain itu, mesin pengiris bawang merah memiliki keunggulan dalam pengaturan ketebalan pemotongan bawang merah yang dikehendaki. Diharapkan, melalui penyediaan mesin pengiris bawang merah yang inovatif tersebut akan mampu meningkatkan produktivitas kerja pengusaha bawang merah di Kenagarian Talang Babungo dengan estimasi ± 400% peningkatan hasil produksi dibandingkan dengan metode pengirisan secara manual. Hal ini juga akan mendorong peningkatan roda ekonomi dan kesejahteraan masyarakat setempat.

Project-based learning module on creativity and entrepreneurship product subjects: Validity and empirical effect Aziz, Wildan Abdul; Wulansari, Rizky Ema; Putra, Randi Purnama; Tun, Hla Myo; Tin, Chau Trung; Ya, Kyaw Zay
Jurnal Pendidikan Teknologi Kejuruan Vol 6 No 3 (2023): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v6i3.34323

The learning process of Creativity and Entrepreneurship Product subjects in Vocational High Schools still uses printed books, resulting the students’ boredom in learning the materials. Apart from that, the learning method used is the lecture method which is certainly less effective in supporting students' understanding on the materials so that learning is more teacher-centered. Meanwhile, the demand for the Emancipated Curriculum is that learning must be student-centered. This study aimed to develop learning tools for PjBL-based teaching module on the Creativity and Entrepreneurship Product subjects. This research was a research and development using the ADDIE development model. There were 12 experts who validated this module from 3 aspects, including material, media and model, and language aspects, and 30 students as participants for pilot study. The results of this research showed that this module is valid and has positive effects in supporting the learning process for the Creativity and Entrepreneurship Product subjects. This study brings pedagogical implications for the effectiveness of Creativity and Entrepreneurship Product subjects and is a method that can be implemented by teachers in the subject learning.

Pengaruh Massa Weight Roller terhadap Keausan Material dan Akselerasi Motor N-Max Ghozali, Rahmatul; Putra, Randi Purnama; Abadi, Zainal; Arafat, Andril
Al-DYAS Vol 3 No 1 (2024): FEBRUARI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/aldyas.v3i1.2754

The Nmax motorbike roller basically consists of 6 units which function to maintain and regulate motor acceleration found in the Roller Housing in the Continuously Variable Transmission (CVT) section which allows friction and wear to occur on the roller material. Acceleration is the level of acceleration that occurs in an object at a certain time, while material wear is the mechanical property of an object to accept loads, power and energy without causing damage. This research was carried out using a Tribometer test tool and logger pro analysis software. The results obtained show that material wear increases with increasing RPM. At 500 rpm, standard roller wear ranges from 0.107% to 0.346%, while at 1400 rpm, wear increases to range from 0.323% to 0.938%. The acceleration test results show that the standard roller with a mass of 13 grams has the lowest acceleration performance, with the lowest value occurring in test II at 1.26 m/s². Meanwhile, the 9 gram roller has the highest average acceleration of 4.82 m/s².

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