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Journal of Mechanical Engineering Learning
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Articles 41 Documents
PENGARUH TEMPERATUR PADA PROSES TRANSESTERIFIKASI TERHADAP KARAKTERISTIK BIODIESEL DARI MINYAK GORENG BEKAS Atmoko, Wahyu Puji
Journal of Mechanical Engineering Learning Vol 3 No 1 (2014)
Publisher : Journal of Mechanical Engineering Learning

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The purpose of this research was to determine the effect of temperature on the quality of the biodiesel transesterification process. Raw materials used in the making process of biodiesel is waste cooking oil. This Research using the transesterification process by react catalyst and methanol then mixed along with the waste cooking oil. The mixing takes one hour each mixing using a variation of temperature of 30°C, 40°C, 50°C and 60°C. Then the transesterification proceeds deposited for approximately 24 hours. The results of the precipitation in the form of biodiesel and glycerin is separated. The biodiesel washing process 4 times washing and drying biodiesel by heating with the temperature reaching 112°C and cooling. Test results on the density characteristics of temperature variation 30°C and 40°C of 0.8779 g / ml, 50°C for 0.8771 g / ml and a temperature of 60°C values ​​obtained 0.8747 g / ml. On testing the viscosity temperature 30°C, 40°C, 50°C and 60°C resulting value 5.258 mm2 / s, 5.078 mm2 / s, 4.939 mm2 / s, and 4.728 mm2 / s. For the test results to the flash point temperature of 30°C is 202.5°C, at 40°C temperature variation of 198.5°C, at temperature 50°C obtained 196.5 ° C and 60°C at 192.5°C. From the test data, the results obtained characteristic density, viscosity and flash point. The results showed that all of the testing of biodiesel produced meets the standard characteristics of biodiesel. It can be concluded that the use of variations in temperature do not affect the characteristics of the biodiesel. In addition, biodiesel research results according to the criteria of diesel motor fuel.
PENGARUH VARIASI TEMPERATUR CETAKAN TERHADAP KARAKTERISTIK BRIKET KAYU SENGON PADA TEKANAN KOMPAKSI 5000 PSIG Naim, Darun; Dwi Saputro, Danang; -, Rusiyanto
Journal of Mechanical Engineering Learning Vol 2 No 1 (2013): Journal of Mechanical Engineering Learning
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AbstrakPotensi limbah industri pengolahan kayu sengon sangat banyak, mulai dari potongan rant-ing, kulit dan sisa gergajian. Limbah dari sisa gergajian pohon sengon saat ini masih jarang dimanfaatkan oleh masyarakat setempat. Sampah tumbuhan tersebut apabila diolah dengan zat pengikat polutan akan menjadi suatu bahan bakar padat buatan yang lebih luas penggu-naannya sebagai bahan bakar alternatif yang disebut briket. Adapun tujuan yang ingin dicapai dari penelitian ini adalah untuk mengetahui pengaruh variasi temperatur cetakan terhadap karakteristik briket kayu sengon dengan cara menguji sifat fisik, kimia dan kekuatan mekan-iknya. Pembuatan briket diawali dengan penjemuran serbuk gergaji kayu sengon hingga kadar airnya kurang dari 14% kemudian digiling, diayak lolos mesh 60 dan ditimbang 3,5 gram se-tiap sampel. Pembriketan dilakukan dengan cara mengkondisikan bahan baku pada tempera-tur 800C untuk temperatur cetakan 1000C, 900C untuk temperatur cetakan 1200C, dan 1000C untuk temperatur cetakan 1400C. Setelah mencapai temperatur yang diinginkan briket dipa-datkan dengan cara pengepresan pada tekanan 5000 Psig dan waktu penahan 1 menit. Pem-buatan briket dilakukan tanpa menambahkan bahan perekat. Hasil penelitian menunjukkan pembuatan briket dengan metode cetak panas berpengaruh terhadap sifat fisik yaitu stability dan shatter index, dari hasil uji yang dilakukan briket terbaik berada pada variasi temperatur cetakan 1200C, karena pada suhu ini lignin dapat mengikat partikel briket dengan baik, tetapi metode cetak panas tidak berpengaruh terhadap densitas, akan tetapi densitas berpengaruh terhadap tekanan kompaksi. Pembuatan briket dengan metode cetak panas berpengaruh den-gan briket yang dihasilkan, karena mampu untuk meniadakan bahan perekat sehingga proses pembuatan briket lebih cepat, briket langsung dapat digunakan tanpa proses pengeringan dan mampu mempertahankan nilai kalor bahan baku.AbstractPotential industrial waste processing sengon very much, ranging from pieces of twigs, bark and sawn rest. Waste from the rest of the tree sawn sengon is still rarely used by local people. Waste plant when mixed with a binder pollutants will be a solid fuel made wider use as an alternative fuel called briquettes. The objectives of this study was to determine the effect of temperature variations on the characteristics of wood briquettes mold sengon by examining the physical, chemical and mechanical strength. Making briquette begins with drying sawdust sengon until the water level is less than 14% then ground, sieved pass 60 mesh and weighed 3.5 grams of each sample. Pembriketan done by conditioning the raw material at a temperature of 800C to 1000C mold temperature, mold temperature 900C to 1200C, and 1000C to 1400C mold temperature. After reaching the desired temperature by pressing briquettes compacted at a pressure of 5000 psig and a 1-minute barrier. Making briquettes made without added adhesives. Results showed manufacturing briquettes to heat molding method affects the stabil-ity and physical properties Shatter index, the results of tests conducted briquettes are best at 1200C mold temperature variation, because at this temperature the particles can bind lignin briquettes well, but the heat does not print method effect on the density, but the density effect on the compacting pressure. Making briquettes to heat molding method affects the briquettes produced, because it is able to eliminate the adhesive so that the briquette-making process faster, briquettes can be used directly without drying process and are able to maintain calorific value of raw materials.
KOMPARASI HASIL BELAJAR SISWA PADAKOMPETENSI DASAR MENGGUNAKAN ALAT UKUR ELEKTRONIK DENGAN MEDIA ALAT SEBENARNYA DAN MEDIA ANIMASI Triyono, Feri; Eko, Budiarso; -, Hadromi
Journal of Mechanical Engineering Learning Vol 2 No 1 (2013): Journal of Mechanical Engineering Learning
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PENGEMBANGAN MEDIA PEMBELAJARAN FLUID CIRCUIT SYSTEM EXPERIMENT PADA MATA KULIAH MEKANIKA FLUIDA DENGAN POKOK PEMBAHASAN PENGUKURAN KERUGIAN ALIRAN FLUIDA Kurniawan, Arief; Rahardjo, Winarno Dwi; Basyirun, Basyirun
Journal of Mechanical Engineering Learning Vol 3 No 2 (2014): Journal of Mechanical Engineering Learning
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Penelitian ini bertujuan untuk menghasilkan media pembelajaran berupa fluid circuit system experiment, mengetahui keefektifan dan keterlaksanaan sebagai media pembelajaran yang valid, dalam mengukur kerugian aliran dalam pipa.Penelitian ini termasuk ke dalam jenis penelitian dan pengembangan (Research and Development) sedangkan desain penelitian ini menggunakan metode ADDIE. Validasi media pembelajaran dilakukan oleh ahli mekanika fluida berjumlah dua orang dan validasi keefektifan dan keterlaksanaan media pembelajaran dilakukan oleh seorang ahli media. Pengujian dilakukan pada mata kuliah mekanika fluida Jurusan Teknik Mesin Fakultas Teknik Universitas Negeri Semarang. Hasil penelitian pengembangan yang dilakukan terhadap media pembelajaran fluid circuit system experiment berupa penggantian komponen  pipa dari besi tuang menjadi pipa tembaga seamless dan penambahan manometer air raksa, sehingga diperoleh media pembelajaran  dengan hasil yang baik berdasarkan uji kerja dari ahli media dan mekanika fluida. Media pembelajaran yang dikembangkan memperoleh penilaian dari ahli media dan ahli mekanika fluida dengan perolehan skor masing-masing 85.56% dan 87,50% sehingga perangkat pembelajaran dinyatakan sangat layak digunakan dalam pembelajaran. Kemudian media pembelajaran fluid circuit system experiment diujicobakan kepada mahasiswa guna mengetahui keefektifan dan keterlaksanaan media pembelajaran fluid circuit system experiment.This research aims to produce learning media fluid circuit system experiment, determine the effectiveness and feasibility as a valid instructional media, in measuring losses in pipe flow.This study belongs to the type of research and development (Research and Development), while the design of this study using ADDIE. Validation is done by two expert learning media fluid mechanics and validation media effectiveness and feasibility study conducted by someone media experts. Tests performed on fluid mechanics courses Department of Mechanical Engineering, Faculty of Engineering, Semarang State University. The results of research conducted on the development of learning media fluid circuit system experiment components such as replacement of cast iron pipe into a seamless copper pipe, instructional media in order to obtain good results with a test based on the work of media experts and fluid mechanics. Learning media developed to obtain an expert assessment of the media and fluid mechanics expert with acquisition scores respectively 85,56 % and 87,50 % stated that it is well worth learning device used in the study. Then learning media fluid circuit system experiment tested the students to determine the effectiveness and feasibility learning media fluid system circuit experiments.  
ANALISIS KOMPOSISI CAMPURAN AIR DENGAN LIMBAH KOTORAN SAPI DAN PELETAKAN POSISI DIGESTER TERHADAP TEKANAN GAS YANG DIHASILKAN Sholeh, Achmad; -, Sunyoto; Hidayat Al-Janan, Dony
Journal of Mechanical Engineering Learning Vol 1 No 1 (2012): Journal of Mechanical Engineering Learning
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AbstrakTujuan penelitian ini untuk mengetahui pengaruh komposisi campuran kadar air dengan limbah kotoran sapi dan posisi digester terhadap tekanan tertinggi gas yang dihasilkan. Digester terbuat dari galon air mineral 19 liter kemudian diisi slurry sebanyak 9,5 liter. Pengukuran tekanan gas menggunakan manometer U terbuka. Waktu pengamatan dilakukan selama 10 hari. Produksi tekanan biogas paling tinggi pada digester yang diletakkan merebah yaitu 1,095 atm dengan perbandingan kom-posisi campuran air : kotoran = 60 : 40 dan paling rendah yaitu 1,043 atm dengan perbandingan komposisi campuran air : kotoran = 30 : 70. Produksi tekanan biogas paling tinggi pada digester yang diletakkan berdiri yaitu 1,065 atm dengan perband-ingan komposisi campuran air : kotoran = 60 : 40 dan paling rendah yaitu 1,033 atm dengan perbandingan komposisi campuran air : kotoran = 30 : 70. Selisih tekanan antara digester yang diletakkan merebah dengan berdiri rata-rata 0,021 atm. Ber-dasrkan hasil penelitian dapat disimpulkan bahwa komposisi campuran kadar air dengan limbah kotoran sapi yang tepat terhadap tekanan tertinggi gas yang dihasil-kan adalah komposisi campuran air : kotoran = 60 : 40 dan ada pengaruh peletakan posisi digester berdiri dan merebah terhadap tekanan gas yang dihasilkan, dimana yang merebah menghasilkan tekanan gas yang lebih tinggi.AbstractThe purpose of this study to determine the effect of the water content of the mixture composi-tion with cow manure digester and the position of the highest pressure gas produced. Digester made of gallons of mineral water 19 liter slurry is then filled as much as 9.5 liters. Measure-ment of gas pressure using a manometer U is open. When the observations were made for 10 days. Production of the high pressure biogas digester placed at 1.095 atm lay down the composition of the mixture in the ratio of water: dung = 60: 40 and the low at 1.043 atm with a mixture composition ratio of water: dung = 30: 70. Production of the high pressure biogas digester that is placed on a stand that is a ratio of 1.065 atm water mixtures: muck = 60: 40 and the low at 1.033 atm with a mixture composition ratio of water: dung = 30: 70. The difference in pressure between the digester is placed standing leaned average 0.021 atm. Berdasrkan The research concluded that the water content of the mixture composition with cow manure right to the highest pressure of the gas produced is the composition of a mixture of water: dung = 60: 40 and no effect of laying position digester up and leaned against the pressure of the gas produced, where a lie down produce a higher gas pressure.
PENINGKATAN HASIL BELAJAR DENGAN PENERAPAN MODEL PEMBELAJARAN KONSTRUKTIVISME BERBASIS MEDIA PERAGA PADA MATERI ELEKTROPNEUMATIK DALAM MATA KULIAH PNEUMATIK HIDROLIK Zamroni, Muhammad Rifqi
Journal of Mechanical Engineering Learning Vol 3 No 1 (2014)
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This study aims to determine whether there is an increase in student learning outcomes between the use of expository learning model with the model of constructivism. This study uses a quasi-experimental study with a type of pattern pretest-posttest control group design. The study population was 2013 semester of the academic year students who took the 5-Hydraulic Pneumatic course consisting of 2 classes with a number of 90 students. The samples were taken with a saturated sampling method, one class as control group numbering 40 students and one class as experimental group numbering 40 students,. The control group will be given expository teaching model, while the experimental group was given a model of constructivism. Based on the research results obtained, that the average competence elektropneumatik learning outcomes in the control group increased to 58.64 originally 77.41. In the experimental group the average results of the original study increased to 87.21 58.15.
PERANGKAT PENGUKUR TINGKAT KEPUASAN MAHASISWA TERHADAP PROSES PEMBELAJRAN DI JURUSAN TEKNIK MESIN UNIVERSITAS NEGERI SEMARANG Efy Setiawan, Arta; Budiyono, Aris; -, Boenasir
Journal of Mechanical Engineering Learning Vol 2 No 2 (2013): Journal of Mechanical Engineering Learning
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PENGEMBANGAN MEDIA PEMBELAJARAN PENGUKURAN RUGI ALIRAN FLUIDA CAIR DALAM PIPA VENTURI UNTUK MENUNJANG PERKULIAHAN MEKANIKA FLUIDA Ramadhan, Yosi; Ramelan, Ramelan; Sumbodo, Wirawan
Journal of Mechanical Engineering Learning Vol 3 No 2 (2014): Journal of Mechanical Engineering Learning
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Penelitian ini bertujuan mengembangkan media pembelajaran pengukuran rugi aliran fluida dalam pipa venturi dan untuk mengetahui pengaruh variasi penutupan gate valve terhadap kerugian aliran fluida cair yang melewati pipa venturi. Penelitian menggunakan katup jenis gate valve dengan ukuran 1 inc. Putaran penutupan gate valve bervariasi dari 0-4 putaran (tertutup 80%). Pengukuran tinggi tekanan  dapat dilihat pada manometer. Metode penelitan yang digunakan adalah penelitian dan pengembangan dengan pendekatan ADDIE. Validasi media pembelajaran dilakukan oleh 2 pakar ahli mekanika fluida. Pengumpulan data menggunakan metode kuesioner/angket dan dokumentasi. Teknik analisis data untuk kuesioner menggunakan deskriptif persentase. Setelah membuat media pembelajaran pengukur rugi aliran fluida cair, kemudian dilakukan pengujian sesuai variabel yang ditentukan, sehingga diperoleh data hasil penelitian. Hasil pengembangan yang dilakukan berupa penggantian reservoir yang dulunya bahannya dari besi menjadi plastik, dan penambahan manometer U Hg (air raksa), sehingga diperoleh media pembelajaran dengan hasil yang baik berdasarkan dari pakar ahli. Berdasarkan hasil penilaian dari 2 pakar ahli mekanika fluida memperoleh nilai 87,72% sehingga media pembelajaran dikategorikan sangat layak karena dalam pembuatan media pembelajaran komponen-komponen sudah memenuhi standar dan dalam penggunaan sudah berjalan dengan baik. Hasil penelitian menunjukan aliran fluida cair yang melewati pipa venturi (tinggi tekanan, tekanan, kecepatan, debit, dan head losses) mengalami kerugian aliran yang semakin mengecil (terjadi penurunan) ketika gate valve semakin menutup.This research purpose to develop learning media loss measurements of the fluid flow in the venturi pipe and to determine the effect of variations in gate valve closure against loss of fluid flow through a venture pipe. Research use the valve type gate valve size 1 inc. Rotation gate valve closure varies are from 0-4 Rotation (80 % closed). High- pressure measurements can be seen on the manometer .Research method used is a research and development with the ADDIE approach. Validation of  learning media is done by 2 experts fluid mechanics expert. Data collection use questionnaires/questionnaire and documentation. Data analysis Techniques use descriptive questionnaire percentage. After make learning media measuring loss of fluid flow, then appropriate testing specified variable, in order to obtain research data. The results of the development was done by replacing reservoir of metal into a plastic material, and the addition of a manometer U Hg (mercury), so can be obtained learning media with good results based on the expert of experts. Based on 2 expert assessment of fluid mechanics experts, it gained 87,72% so the learning media is very well categorized because in the making of learning media, components meet standard and the using was good. The results show that the flow of fluid that passing through the venturi pipe (high pressure, pressure, velocity, discharge, and head losses) get flow losses that smaller (decrease) when the gate valve is closer.
PENERAPAN MODEL PEMBELAJARAN EXPERIENTIAL LEARNING BERBANTUAN MODUL PADA KOMPETENSI MENGUNAKAN ALAT-ALAT UKUR (MEASURING TOOLS) Joko Purnomo, Agus; -, Karsono; Suharmanto, Agus
Journal of Mechanical Engineering Learning Vol 2 No 2 (2013): Journal of Mechanical Engineering Learning
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PERBEDAAN HASIL BELAJAR KOMPETENSI MENJELASKAN PROSES-PROSES MESIN KONVERSI ENERGI MENGGUNAKAN MODEL PEMBELAJARAN SNOWBALL THROWING DENGAN MODEL PEMBELAJARAN LANGSUNG Irawan, Zudi
Journal of Mechanical Engineering Learning Vol 3 No 1 (2014)
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This study aims at finding out if the differences and a significant increase in learning outcomes between the experimental group were taught by Snowball Throwing learning model and the control group were taught with direct instruction on competencies Explaining Processes Energy Conversion Machine. In this study research design pre-experimental design with a static group comparison approach. The population was class X Light Vehicle Engineering (X TKR) SMK N 10 Semarang academic year 2013/2014. Samples was determined using cluster random sampling technique and derived class X TKR 2 as the experimental group and class X TKR 3 as a control group. The results of the analysis of data showed the average value of the initial data for the experimental group was 51.68 then after the experiment increased to 65.33 which means an increase of 13.65 (26%) and for the control group the average value of the initial data for 53.94 then after the experiment increased to 63.97 which means an increase of 10.03 (19%). It concluded there was no difference and a significant improvement in learning outcomes, however the use of Snowball Throwing learning model has been better than direct instruction because of increased learning outcomes experimental group is greater than the control group.