Mekanika: Majalah Ilmiah Mekanika
"Mekanika: Majalah Ilmiah Mekanika" is an open-access journal published by Mechanical Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret. Mekanika invites scholars, researchers and practioners who have interest in mechanical engineering to publish their articles and also provides forums for them to share their works and knowledge. Mekanika focuses on the area of materials engineering and science, design, energy, manufacturing and construction but is not limited to. Both English and Bahasa are accepted in this journal. Mekanika has two issues every year (March and September) and aims to publish more frequently in the future.
Articles
91 Documents
<![CDATA[The Effect of Stirrer Depth And Electroless Coating of Hardness And Tensile Strength in Aluminium Matrix Composite AL6061-AL2O3 ]]>
<![CDATA[Sukma Andini]]>;
<![CDATA[Eko Surojo]]>;
<![CDATA[Teguh Triyono]]>
<![CDATA[ Mekanika: Majalah Ilmiah Mekanika Vol 20, No 1 (2021): MEKANIKA: Majalah Ilmiah Mekanika ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/mekanika.v20i1.48073
<![CDATA[Metal matrix composite (MMC) are composite materials that are widely used in the industrial sector. Examples of metal matrix composites are Al6061 as matrix alloys and Al2O3 as reinforcement. In general, making Al6061-Al2O3 composites using the stir casting method. The stirring parameter in the stir casting affects the physical and mechanical properties of the composites. The physical and mechanical properties of composites can be improved by increasing the wettability of the reinforcement. This research was conducted to determine the effect of the depth of stirring and electroless coating treatment on the hardness and tensile strength of Al6061-Al2O3 composites. The process of making composites with Al2O3 reinforcing particles with 6% weight fraction mixed with aluminum alloys and 2.5% magnesium powder as a wetting agent. Variations of this study were the depth of the stirrer and electroless coating treatment. The depths of stirring used for the experiment were 30%, 45%, and 60% of the height of the fluid. The testing phases in this study were the density and porosity test, metallographic observation, hardness test, and tensile test. The most efficient variation of the mixer depth was obtained at a mixer depth of 30% of the fluid height. The highest hardness and tensile strength test results are hardness value of 72.43 HBN and tensile strength of 182.19 MPa with electroless coating reinforcement treatment]]>
<![CDATA[Rancang Bangun Kompor (Burner) Berbahan Bakar Oli Bekas ]]>
<![CDATA[Annasruddin Pratama]]>;
<![CDATA[Basyirun Basyirun]]>;
<![CDATA[Yohan Widhi Atmojo]]>;
<![CDATA[Gilang Wahyu Ramadhan]]>;
<![CDATA[Alif Rivan Hidayat]]>
<![CDATA[ Mekanika: Majalah Ilmiah Mekanika Vol 19, No 2 (2020): MEKANIKA: Majalah Ilmiah Mekanika ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/mekanika.v19i2.42378
<![CDATA[Penelitian ini bertujuan untuk mengetahui rancang bangun kompor (burner) berbahan bakar oli bekas, beserta spesifikasinya dan mengetahui hasil pengujian menggunakan kompor (burner) pembakaran oli bekas. Berangkat dari kurangnya pemanfaatan limbah oli bekas dan belum adanya alat yang baik untuk memanfaatkan oli bekas tersebut. Disisi lain apabila digunakan sebagai bahan bakar, oli bekas tidak menghasilkan pembakaran sempurna. Penelitian ini menggunakan model perancangan French. Penelitian ini disimpulkan bahwa kompor (burner) yang dirancang memiliki bentuk yang besar dibandingkan pada burner pada umumnya. Kompor (burner) mencapai tekanan 3.5 bar dengan suhu mencapai 1127 °C. Api yang dihasilkan oli bekas berwarna jingga. Perbandingan bahan bakar menghasilkan data bahwa elpiji lebih cepat 16 menit dibandingkan oli bekas dalam peleburan alumunium. Panjang nyala api paling tinggi ialah 1.57 m pada variasi tekanan udara 3 bar dan paling rendah ialah 0.83 m pada tekanan 1 bar. Adanya pengaruh variasi tekanan terhadap temperatur pembakaran dengan temperatur minimal dan maksimal mencapai titik tertinggi dengan tekanan sebesar 2.5 bar dengan temperatur sebesar 118 °C dan 994 °C sedangkan untuk titik terendah pada temperatur minimal dan maksimal pada tekanan 1 bar dengan temperatur sebesar 80,4 °C dan 662 °C dengan tekanan 0,5 bar. Waktu konsumsi bahan bakar dengan variasi jarak sebesar 2200 km menghasilkan waktu yang cukup singkat yaitu sebesar 12 menit 25 detik. Sedangkan waktu konsumsi yang diperoleh dari variasi jarak 1800 km sebesar 17 menit 11 detik.]]>
<![CDATA[Redesign Mata Bor Tanah Untuk Pembuatan Lubang Biopori Di Desa Puron, Kecamatan Bulu, Kabupaten Sukoharjo ]]>
<![CDATA[Zainal Arifin]]>;
<![CDATA[Dominicus Danardono Dwi Prija Tjahjana]]>;
<![CDATA[Rendy Adhi Rachmanto]]>;
<![CDATA[Suyitno Suyitno]]>;
<![CDATA[Singgih Dwi Prasetyo]]>;
<![CDATA[Trismawati Trismawati]]>
<![CDATA[ Mekanika: Majalah Ilmiah Mekanika Vol 19, No 2 (2020): MEKANIKA: Majalah Ilmiah Mekanika ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/mekanika.v19i2.43393
<![CDATA[The lack of rainfall and the absence of catchment areas are the main factors of the lack of water in Puron Village. Making biopori becomes solutive because it is useful for water absorption, reducing standing water, composting containers, and fertilizing the soil. Artificial biopores are made by making holes in the ground using tools such as crowbars or using ground drilling machines. The use of aids model adapted to the drill bit based on the state of the soil contour. This research is focused on classifying drill bits and redesigning which is in accordance with the condition of the soil environment in Puron Village, Bulu District, Sukoharjo Regency. So that biopori holes can be created more effectively and efficiently. The research method was carried out through the classification of tool drill bits through the house of quality product (HOQ) and redesign using Autodesk Fusion 360 software application. It was found that the design with a screw drill model with a pointed spiral has a high product quality value and can applied in puron Village. The design of the drill bit by adjusting the contours of the Puron Village can make a 100 mm diameter biopori hole. The design specifications of the drill bit with steel cast with 12 spiral plates with a length of 1300 mm with a diameter of 115 mm can be driven with a 10 HP engine. The design results have maximum stress, displacement, reaction force and strain of 3.62 MPa, 0.00081 mm, 0.35 N, and 0.000015.]]>
<![CDATA[Procurement and Operation Technical For Meniran (Phyllanthus Niruri) Extraction Equipment ]]>
<![CDATA[Budi Santoso]]>;
<![CDATA[Fitrian Imaduddin]]>;
<![CDATA[Heru Sukanto]]>;
<![CDATA[Joko Triyono]]>;
<![CDATA[Raymundus Lullus Lambang]]>;
<![CDATA[Purwadi Joko Widodo]]>;
<![CDATA[Dwi Heru Siswantoro]]>
<![CDATA[ Mekanika: Majalah Ilmiah Mekanika Vol 20, No 1 (2021): MEKANIKA: Majalah Ilmiah Mekanika ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/mekanika.v20i1.45487
<![CDATA[At this time the government prohibits the use of antibiotics in animal feed as a growth promoter (AGP) or antibiotic, so an effective and safe immunomodulator and herbal growth stimulant product are needed through Meniran extract products (Phyllantus niruri) and chemicals in the market are not yet optimal as immunomodulators and growth stimulants. CV. Maxipro Agrosatwa which is engaged in veterinary medicine, wholesale trade of agricultural products, and other live animals will produce feed using Meniran extract products. Extraction equipment that is needed is a Rotary vacuum evaporator. This equipment is needed to separate the solvent from the solute without high heating which will damage the solute content. The vacuum condition in the flask is to make the separation more efficient as well as accelerate the separation of the solvent from a solution by reducing the boiling point. The rotation of the flask is to increase evaporation. The complexity of this equipment is what makes CV. Maxipro Agrosatwa cannot handle it alone and requires technical assistance from the Department of Mechanical Engineering (JTM) FT UNS. Technical assistance provided by JTM FT UNS is in the form of procurement, delivery, installation, operation, and maintenance of the rotary vacuum evaporator.]]>
<![CDATA[Rancang Bangun Alat Elliptical trainer Outdoor ]]>
<![CDATA[Zainal Arifin]]>;
<![CDATA[Singgih Dwi Prasetyo]]>;
<![CDATA[Suyitno Suyitno]]>;
<![CDATA[Dominicus Danardono Dwi Prija Tjahjana]]>;
<![CDATA[Rendy Adhi Rachmanto]]>;
<![CDATA[Wibawa Endra Juwana]]>;
<![CDATA[Chico Hermanu B. Apribowo]]>;
<![CDATA[Trismawati Trismawati]]>
<![CDATA[ Mekanika: Majalah Ilmiah Mekanika Vol 19, No 2 (2020): MEKANIKA: Majalah Ilmiah Mekanika ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/mekanika.v19i2.44325
<![CDATA[The placement of outdoor fitness equipment at tourist attractions is one of the attractions for tourists. Besides that, it can also be used as a means of health socialization for the community in public places. The elliptical trainer type air walker is a popular fitness tool because it is easy to use and has a small risk of injury. Elliptical trainer has a working principle like a walking person where movement is influenced by the force of the hand and leg movements. The design of an elliptical trainer fitness equipment that will be placed in a public place needs to be done to get a good level of security. This article discusses the design of an elliptical trainer device that is safe to place outdoors. The design process uses the Solidworks 2017a application. The elliptical trainer is divided into 4 parts, namely the main frame, drive shaft, hand handle, and leg handle. The manufacturing process is carried out based on Design Manufacture and Assembly and machinery to reduce the risk of manufacturing failure and make it easier to work on. The result of the elliptical trainer design has dimensions of 2,500 x 1,800 x 1,000 mm. The main frame has a safety factor of 3 with a displacement of 8,524e-7 mm.]]>
<![CDATA[Pengaruh Pemaparan Cuaca Terhadap Kekuatan Impak Komposit rHDPE Berpenguat Serat Pelepah Salak ]]>
<![CDATA[Mas'ud Nur Hanif]]>;
<![CDATA[Dody Ariawan]]>;
<![CDATA[Wijang Wisnu Raharjo]]>
<![CDATA[ Mekanika: Majalah Ilmiah Mekanika Vol 19, No 2 (2020): MEKANIKA: Majalah Ilmiah Mekanika ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/mekanika.v19i2.43204
<![CDATA[Tujuan dari penelitian ini adalah untuk mengetahui pengaruh pemaparan cuaca terhadap kekuatan impak dari komposit rHDPE - serat pelepah salak. Fraksi volume pada komposit adalah 30%. Spesimen dibuat menjadi 3 variasi, yaitu spesimen rHDPE murni sebagai spesimen kontrol, komposit rHDPE berpenguat serat pelepah salak dengan perlakuan alkali, dan komposit rHDPE berpenguat serat pelepah salak tanpa perlakuan alkali. Pemaparan cuaca dilakukan selama 6 bulan. Untuk mengetahui kerusakan mikroskopis spesimen, pengamatan menggunakan Scanning Electron Microscopy (SEM) dilakukan. Setelah 6 bulan pemaparan cuaca, hasil pengujian menunjukkan bahwa perlakuan alkali hanya berpengaruh sebelum pemaparan cuaca. Sedangkan setelah dipaparkan cuaca, hasil antara komposit dengan perlakuan dan tanpa perlakuan alkali menunjukkan kesetaraan.]]>
<![CDATA[Surface Roughness and Fiber Angular Orientation Analysis Toward Laminated Composite Crack Propagation ]]>
<![CDATA[Hilmi Iman Firmansyah]]>;
<![CDATA[Bayu Pranoto]]>;
<![CDATA[Chandra Gunawan]]>;
<![CDATA[Hangga Wicaksono]]>;
<![CDATA[Muhammad Fakhruddin]]>
<![CDATA[ Mekanika: Majalah Ilmiah Mekanika Vol 20, No 1 (2021): MEKANIKA: Majalah Ilmiah Mekanika ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/mekanika.v20i1.48188
<![CDATA[Composite is a material that consisting of two or more materials, either micro or macro, where the properties of the material differ in shape and chemical composition from the original substance. In this study, fatigue testing of fiber metal composites was carried out to determine the rate of crack propagation so that the age of the fiber metal composite specimen was known. The independent variable in this research is the angular orientation of the carbon fiber and the surface roughness of the aluminum with the dependent variable response is the bridge crack rate. The manufacture of fiber metal laminates specimens uses the Vacuum Resin Infuse (VARI) method, which uses a vacuum pump as a means to flow the resin from the reservoir to the mold. This method is used to minimize the occurrence of air bubbles trapped on the specimen which causes porosity defects which will reduce the strength of the metal laminates specimen itself. Fatigue testing is performed using the stress amplitude method. That is, the value of the load when the tensile test is one third of the tensile strength. After the fatigue test was carried out, the results were obtained on specimens with an angular orientation of 0/90 ° fibers, the crack propagation rate slowed down with a cycle value of 90000 in specimens with a surface roughness value of 2.128 µm then decreased cycles on specimens with a value of 2.887 µm, namely 11000 cycles.]]>
<![CDATA[The Effect of Alkali Treatment And Microcrystalline Cellulose Addition on Density Value of Cantala Fiber Reinforced Unsaturated Polyester Composites ]]>
<![CDATA[Muhammad Ghozali]]>;
<![CDATA[Dody Ariawan]]>;
<![CDATA[Eko Surojo]]>
<![CDATA[ Mekanika: Majalah Ilmiah Mekanika Vol 20, No 1 (2021): MEKANIKA: Majalah Ilmiah Mekanika ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/mekanika.v20i1.47460
<![CDATA[Natural fiber reinforced composites is one materials potentially developing in Indonesia. One of biggest problem with composites specimen is its void. One properties to find out void of composites is composites density value. The objective of research is to investigate the effect of fiber alkali (NaOH) treatment and microcrystalline cellulose (MCC) addition on density value of cantala fiber reinforced unsaturated polyester composites. Firstly, cantala fibers was submerged into alkali (NaOH) 6% solution for 0, 3, 6, 9, and 12 hours. Furthermore, the fiber was washed using acetid acid and then using clean water to reach pH 7. Thereafter, cantala fiber was dried in the oven for 10 hours at temperature 600C. Composites was composed of cantala fiber, unsaturated polyester polymer matrix, and microcrystalline cellulose according to the composition with volume fraction 30%. Composites was casted using compression molding method with compressive strength of 10 MPa for 12 hours. All specimens of composites undertake post cure for 2 hours at 600C. Density test was conducted using densimeter by calculating the density of composites in the air and the water. The result of research showed that the longer the alkali treatment time and the more addition of microcrystalline cellulose (MCC) filler, the higher is the composites density. The higher density value of cantala fiber reinforced unsaturated polyester is alkali treatment 6 hours, which was 1.223 gr/cm3.]]>
<![CDATA[Perancangan Kapal Tanpa Awak Penebar Pakan Ikan di Wilayah Pesisir Pantai Berbasis Microcontroller Arduino ]]>
<![CDATA[Aknaf Sam Dabit]]>;
<![CDATA[Abdillah Ebriel Lianto]]>;
<![CDATA[Satrya Ady Branta]]>;
<![CDATA[Fajar Budi Laksono]]>;
<![CDATA[Aditya Rio Prabowo]]>;
<![CDATA[Nurul Muhayat]]>
<![CDATA[ Mekanika: Majalah Ilmiah Mekanika Vol 19, No 2 (2020): MEKANIKA: Majalah Ilmiah Mekanika ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/mekanika.v19i2.43671
<![CDATA[Unmanned Surface Vehicle (USV) banyak digunakan di daerah maritim. Di Indonesia ada banyak petani tambak ikan yang masih melakukan proses pemberian pakan ikan secara manual menggunakan tenaga manusia. Untuk pembudidaya ikan yang memiliki kolam 10 m × 4 m atau lebih, hanya bisa menabur pakan ikan di pinggir kolam, sehingga pakan ikan tidak bisa merata hingga ke tengah kolam. Kapal tanpa awak penebar pakan ikan berbasis microcontroller Arduino ini dibuat sebagai solusi untuk masalah petani ikan yang memiliki ukuran kolam besar dalam distribusi pakan ikan lebih merata. Dengan menggunakan kapal tanpa awak penebar pakan ikan berbasis microcontroller Arduino pemberian pakan ikan akan lebih mudah, efisien, dan merata. Tiga sensor ultrasonic yang terpasang dibagian depan kapal terhubung dengan Arduino Due, yang dilanjutkan dengan melakukan paralel dengan Arduino Uno yang mengatur pergerakan servo MG-995 untuk menggerakkan daun kemudi kapal. Kapal dirancang mampu membawa beban pakan ikan sebesar 5 kg dan mampu dioperasikan secara manual maupun otomatis. Pengoperasian otomasi kapal dibantu dengan Arduino Uno dan Arduino Due sebagai pusat pengaturan, dan tiga sensor ultrasonic memberi sinyal dengan menangkap pengahalang didepan kapal, sehingga kapal mampu berbelok sebelum terjadi tabrakan.]]>
<![CDATA[Implementation of Automatic Dust Detector on Dust Suppression System on Transfer Tower 0 In Paiton 9 Power Plants ]]>
<![CDATA[Adam Febrian Maulana]]>;
<![CDATA[Trismawati Trismawati]]>;
<![CDATA[Mustakim Mustakim]]>
<![CDATA[ Mekanika: Majalah Ilmiah Mekanika Vol 20, No 1 (2021): MEKANIKA: Majalah Ilmiah Mekanika ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/mekanika.v20i1.48208
<![CDATA[The operation of dust suppressor and dust collector was operating semi-manually by pressing the power button on the local panel during the initial unloading of coal material from the barge or stockpile, where local operators manage several large areas. This research is carried out on the implementation of Automatic Dust Detector for Dust Suppression operational at Paiton Unit 9 power plants with the aim of increasing the efficiency of operator and equipment performance. We use House of Quality (HOQ) as a determinant of the priority scale for technical response to be implemented, namely the addition of an Automatic Dust Detector. The results obtained showed a decrease in the calculation of the dust suppression operating time, i.e. from 5 hour 54 minutes to 5 hour 6 minutes, from 1005,36L/barge to 869,04L/barge for water consumption, and 1L/barge to 0,86L/barge for chemical use. Furthermore, the implementation of the Automatic Dust Detector can significantly increase efficiency at least 15% from operating time difference. ]]>
