Analisa Desain Rangka Alat Compact Heat Induction Press Menggunakan Metode Finite Element Analysis

<p><em>In manufacturing technology, accuracy, effectiveness, and efficiency are important factors because the use of technology is expected to maximize quality and quantity with existing resources. The manufacturing process is the process of making products starting with the selection of raw materials and the machining process following the design to suit the needs. In other words, design is the main thing before carrying out manufacturing activities. Meanwhile, in designing a machine, it is necessary to have a material selection procedure according to the application conditions. The strength of the material can be obtained by simulating it using the Finite Element Analysis (FEA) method. This simulation aims to determine the maximum safe load limit on the tool frame design. In this study, the design of the tool frame made was given 5 loading treatments, the minimum loading was 50kg and the maximum loading was 200kg. Based on the simulation results, the maximum safety factor occurs at 50 kg loading of 10,019 ul and the minimum safety factor occurs at 200 kg loading with a value of 3.60064 ul. Based on the analysis of the load given to the frame of the compact press and sintering tool that the designed tool is safe.</em></p>

Rancang Bangun Body Fibercarbon dan Simulasi Aerodinamis dengan Ansys untuk Mobil Hemat Energi Kategori Prototype

<p><em>Body is one of mandatory components for the main vehicle, which is a car because the face of the car is located on the body. Moreover, the car used for the body competition must not only be good visually but also have to look at its aerodynamics. In this study, discussing the aerodynamics of a prototype energy-efficient car body with carbon fiber material before it is produced and applied it must first be simulated aerodynamically on an aerodynamic simulation software. The vehicle to be simulated uses a 1:1 scale assuming the actual conditions. From the simulations carried out by the three body type models, the results are Model 1 with maximum Velocity of 64.0925 m/s and a maximum pressure of 1663.09 Pa and a Drag coefficient of: 309.85976, Lift coefficient of: 125.52961, Drag force of : 189.7891 N and Lift force of: 76.886889 N. Model 2 with a maximum Velocity of 58.14 m/s and a maximum pressure of 1350.55 Pa, Drag coefficient of : 399.09712, Lift coefficient of: 455.23564 , Drag force of : 244.44699N and Lift force of: 278.83183 N. Model 3 with a maximum Velocity of 59.8387 m/s and a maximum pressure of 1136.72 Pa, Drag coefficient of : 610,89875, Lift coefficient of: 764,99562, Drag force of: 374,17548 N and Lift force of: 468,55982 N. Based on results analysis using ansys software, Model 1 was chosen because it has the smallest Drag Coefficient, Lift Coefficient, Drag Force and Lift Force.</em></p>

Desain Underwater Rotor Untuk Memanfaatkan Laju Aliran Sungai Sebagai Pembangkit Listrik Tenaga Air

<p><em>This study aims to design an underwater rotor to utilize the flow rate of the river as a hydroelectric power plant. In this study, an underwater rotor design model will be made with three variations in the number of blades, namely three, six, nine blades. The test parameter observed in this study is the turbine performance through the value of the power coefficient (cp) and the moment coefficient (cm). The method used in this research is an experimental method, namely by making a turbine model with a laboratory scale. The results show that the underwater rotor designed with aspect ratio = 2.0, overlap ratio = 0, end-plate diameter = 1.1d then the barrier plate design with L/D ratio = 1.2 60º provides the highest power coefficient and moment coefficient, namely respectively 0.15 and 0.27 in the design with the number of blades 3 (three)</em></p>

Integrasi Statistical Process Control dan Failure Mode And Effect Analysis Guna Meminimalisasi Defect Pada Proses Produksi Pipa PVC

<p><em>Quality can be referred as fitness to use. Furthermore, Quality standard is considered as a way in order to meet customers’ need. PT AZ is a manufacture enterprise which produce polyvinyl chloride (PVC) pipes. This firm has been implementing a Standard Operating Procedure (SOP) in maintaining defect with no more than 2,5% reject product during process production. However, such defects have been happened in production line which were not meet company standards. This study aims to evaluate defect along production process in order to find suitable solution in improving product quality. Seven Tools and Failure and Mode and Effect Analysis (FMEA) were used as research method. The results showed that there were 3 types of defects, namely spot defect, sink marks ant scratch defect. Furthermore, the results of the Cause-and-effect diagram show that human error, </em><em>material</em><em>s and machine are considered as main factors in contributing such defect. In addition, result from FMEA analysis detect that analysis and calculation of the highest RPN 147, namely the human factor is considered as the highest Risk Priority Number with 147 score. This study suggest that further training and supervision should be give to employees in order to improve employers’’ knowledge</em></p><p><em><br /></em></p>

Rancang Bangun dan Simulasi 3D Printer Model Cartesian Berbasis Fused Deposition Modelling

<p><em>The process of designing and manufacturing a Cartesian 3D printer model based on Fused Deposition Modelling (FDM) is carried out to produce a 3D printer machine that can perform the printing process accurately and quickly. In this research, the process is divided into three stages, namely designing using Computer-Aided Design (CAD) software, printing and assembling components of a 3D printer machine, and analysing the mechanical structure of a 3D printer machine. This 3D printer is designed to carry out the printing process with an area of 180x180x150 mm. Some components of 3D printing machines use Polylactic Acid (PLA). The simulation results based on the Finite Element Method show that the 3D printer engine is feasible to produce printing with a mass of 40% of the maximum possible load.</em></p>

Rancang Bangun dan Uji Performansi Alat Pembuka Katup Menggunakan Mekanisme Tuas

<p><em>The increasing number of vehicles every year provides opportunities to vehicles service. Vehicle components that often serviced or overhaul is the valve mechanism. How to remove the valve from the cylinder head generally use a manual valve remove tool. The time required to remove the valve using the tools need a long time. Effort to overcome these problems is to modify the existing valve remove mechanism. The purpose of this research is to design and test the performance of valve remove using lever mechanism. Performance test was conducted to determine the press force value to remove the valve, the percentage increase performance and time to remove the valve. The main components of the valve remove tool using the lever mechanism is frame, table, pole support, locking, hand grips, hydraulic, lever pusher and shaft sled. Testing using the valve mechanism is contained in the cylinder head Toyota Kijang 4K. The valve remove tool design has a simple form, easy to make, cheap, but has very good performance. The smallest of the press force to remove the valve is 129 N obtained at a distance of lock and poles support as far as 22 cm. The valve remove tool using the lever mechanism was design can remove the valve from the cylinder head in time 26,17 seconds/valve or 418,67 seconds to remove 16 valves on the cylinder head. This tool is able to improve the performance of manual valve remove tool screw type by 76,28%, and can improve the performance valve remove tool the pneumatic system by 65,79%.</em></p>

Analisa Pengaruh Parameter Proses Terhadap Uji Tarik Produk Hasil 3D Printing Berbahan Polylatic Acid

<p>Fused<em> Deposition Method (FDM) is one of the additive manufacturing methods or methods used by 3D printers. This FDM technology can produce models with a fairly good level of accuracy and strength. However, until now information about the magnitude of the value of accuracy, and the value of strength is very minimal. Because of this, it is necessary to do a test to determine the strength value of the specimens produced using 3D technology printing. The tests carried out aim to obtain settings optimal parameters on a 3D printer using PLA material which is measured by the magnitude of the tensile strength value of the resulting product. The test is carried out by measuring the amount of stress that occurs when the tensile test is carried out. The test was carried out using 81 samples that were printed using the parameters of infill print speed, fill density, extruder temperature, and layer height. Based on the test results, the highest stress value is 1.092 N/m2 with a combination of parameters infill print speed 60 mm/s, fill density 40%, extruder temperature 200oC, and layer height 0.1 mm. The results of the analysis show that the parameter extruder temperature has the greatest influence on the magnitude of the tensile test value, while the layer height parameter has the smallest effect on the value of the test specimen.</em></p>

Analisis Laju Aliran Udara dan Laju Aliran Massa Bahan Bakar Terhadap Beban Pembakaran Sampah pada Incinerator Berbahan Bakar Limbah Oli Bekas

<em>The amount of household waste and B3 from oil machine waste have been increasing along with the increasing of polulation and the number of vehicles.</em> <em>This waste can be used as a source of energy. The aim of this research was to analize the</em> <em>air flow rate and mass flow rate of fuel in the incinerator oil machine waste using a burner furnace by conducting several variations of the experiment with variations in air velocity of 10,4 m/s (B1), 13,4 m/s (B2) and 14,3 m/s (B3) and fuel flow rate of 0,00408 l/s (A1) and 0,00838 l/s (A2) with fuel valve openings 1/2 and 1/4. The test results showed that the highest temperature was 1021,5⁰C in the A2-B3 experiment with 45 minutes and the lowest temperature was obtained in the A1-B1 experiment which was 840,5⁰C at the same time. In the incinerator test, the burning of dry plastic waste weighing 12 kg of waste burns out in 34 minutes with a temperature ratio for the burner furnace which is 780,9⁰C and the incinerator chamber space is 480,7⁰C and the combustion rate is 21,42 kg/hour. the yield of residual combustion is 9,32% and the incinerator combustion eficiency is 90,68% and for dry leaf waste weighing 8 kg the waste is burnt out in 20 minutes with a burner furnace temperature ratio of 712,3⁰C and incinerator chamber space of 443, 2⁰C and the combustion rate of 24,24 kg / hour and the yield of combustion residue is 96,94%.</em>

Simulasi Lemari Pengering Tenga Surya Dengan Prisma Kaca Menggunakan Computational Fluid Dynamics

<p>Lemari pengering merupakan bagian penting pada pemanas udara tenaga surya. Lemari pengering diharapkan mampu menyimpan panas dalam waktu yang lama. Hal tersebut menyebabkan analisa thermal pada lemari pengering perlu dilakukan. Tujuan dari penelitian ini adalah untuk mengetahui karakteristik termal dan aliran yang terjadi pada lemari pengering. Karakteristik tersebut antara lain distribusi temperatur, perubahan temperatur dan kecepatan, dan pola aliran udara. Metode yang digunakan pada penelitian ini adalah <em>Finite Volume Method</em> berupa simulasi menggunakan software komputasi fluida atau <em>Computational Fluid Dynamics</em>, simulasi menggunakan model tiga dimensi pada kondisi transient dengan time step 0.015. Data simulasi diambil saat 5 detik, 15 detik, 25 detik, dan 35 detik. Hasil simulasi diperoleh perubahan distribusi temperatur udara terhadap waktu yang terjadi pada bidang XY dan bidang XZ lemari pengering. Berdasarkan hasil simulasi diketahui terjadi penurunan temperatur udara. Temperatur udara tertinggi terjadi pada bagian bawah lemari pengering dengan temperatur udara sebesar 331 K. Prisma kaca pada bagian atas lemari pengering mampu memberikan panas pada udara. Terjadi aliran balik di dalam lemari pengering yang menyebabkan udara panas dari saluran masukkan tidak terdistribusi merata.</p>

Pembuatan Ekstrak Rhizophora mucronata Sebagai Bahan Baku Inhibitor Korosi Skala Lab dan Skala Aplikasi

Pembuatan inhibitor dalam bentuk ekstrak pekat dari bahan organik pada skala lab telah banyak dilakukan, namun percobaan dalam skala aplikasi yang lebih besar jarang dilakukan. Bahan organik pembuatan ekstrak pekat dapat menggunakan daun bakau (<em>Rhizopora mucronata</em>) banyak ditemukan di daerah mangrove. Penelitian bertujuan untuk membandingkan proses pembuatan inhibitor berupa ekstrak pekat dari daun bakau skala lab dengan skala aplikasi yang lebih besar terkait waktu pemekatan, daya listrik yang digunakan, sifat fisik (berat jenis dan sifat warna), sifat fitokimia (alkaloid, flavonoid, saponin dan tannin) dari ekstrak pekat yang dihasilkan. Pada skala lab, 500 gram daun kering bakau, dilarutkan dalam 500 ml etanol 96%, setelah 2 hari filtrate disaring dan dipekatkan hingga menjadi 10 ml menggunakan rotary evaporator. Pada skala aplikasi 20 kali lebih besar dari skala lab dan proses pemekatan menggunakan kipas angin. Hasil penelitian menunjukkan bahwa proses pembuatan 10 ml ekstrak pekat skala lab menggunakan rotary evaporator memerlukan waktu 4 jam, dengan menghabiskan daya listrik sebesar 10,4 KWH. Ekstrak pekat memiliki berat jenis 0,958 dan sifat warna L* = 2,8, a* = 6,6 dan b* = 3,2. Sedangkan proses pembuatan 200 ml ekstrak pekat skala aplikasi yang lebih besar yang menggunakan kipas angin memerlukan waktu 72 jam, dengan menghabiskan daya listrik sebesar 3,6 KWH. Ekstrak pekat memiliki berat jenis 0,965 dan sifat warna L* = 6,8, a* = 17,4 dan b* = 8,8. Kedua cara ekstraksi memiliki komponen fitokimia yang sama, yaitu flavonoid, saponin dan tannin.