Thoharudin Thoharudin, Thoharudin
Akademi Teknologi Warga Surakarta

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Optimalisasi Parameter Proses Injeksi Menggunakan Simulasi Moldflow untuk Meminimalkan Cycle Time dan Eliminasi Short Shot pada Produk Tempat Anwar, M. Choirul; Budiyantoro, Cahyo; Thoharudin, Thoharudin
JMPM : Jurnal Material dan Proses Manufaktur Vol 2, No 1 (2018): JUNI 2018
Publisher : JMPM : Jurnal Material dan Proses Manufaktur

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Abstract

Plastic materials in the manufacture of food and household appliances have been widely used by the public. Various forms and functions have been made, one of which is using an injection molding machine. With an injection molding machine a packaging design or a fairly complex household appliance can be produced. One of the products that the market is interested in is a traditional rice container. This traditional rice container product uses polypropylene material. In this rice container production process there are several problems, namely the cycle time that is too long and the occurrence of short shots on the product. Of these problems, simulations and optimizations that have been carried out provide better results. Optimization carried out in this study is the process parameters using moldflow simulation. Confirmation based on S / N Ratio analysis, ANOVA on the best parameters, after the optimization simulation is obtained from the previous time 172.59 seconds to 23.88 seconds. Short shot and cavity weight obtained increased from 96.99 grams to 99.36 grams.
EMISI CO DAN NOX PADA GAS BUANGKENDARAAN MENGGUNAKAN KATALIS TEMBAGA BERPORITERMODIFIKASI Unjanto, Stefanus; Palmiyanto, Martinus Heru; Thoharudin, Thoharudin; Nugroho, Arif Setyo
Prosiding SNATIF 2015: Prosiding Seminar Nasional Teknologi dan Informatika
Publisher : Prosiding SNATIF

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Abstrak Tujuan utama pada penelitian ini adalah untuk mereduksi emisis CO dan NOX dengan dua metode. Metode pertama dengan pencampuran bahan bakar antara bahan bakar fosil dicampura dengan bahan bakar nabati. Pada penelitain ini, bensin dicampur dengan etanol dengan pencampuran 5%, 10%, dan 20% menjadi bahan bakar motor 4 tak yang diuji dengan wide open throttle (WOT). Data yang diambil adalah emisi pada putaran motor selama pengujian. Sehingga diperoleh data emisi pada tiap-tiap jenis campuran bahan bakar. Metode kedua dengan memberikan katalis sebagai reformer CO dan NOX yang terbuat dari tembaga termodifikasi dengan penambahan carbon aktif dan SiO2. Dengan variasi pengujian jenis bahan bakar dan jenis modifikasi katalis tersebut dapat diketahui nilai efektifitas reduksi CO dan NOX tertinggi.Berdasarkan hasil pengujian emisi gas buang pada masing-masing bahan bakar menunjukan bahwa pada campuran etanol dan premium 10% volume menunjukan nilai optimum untuk katalis tembaga terkondisikan dengan carbon aktif dan SiO2 10 % menghasilkan konsentrasi optimum CO sebesar 0.15 % voldan HC 106 ppm. Kata kunci: Etanol, karbonmonoksida, reduksi, katalis
Unjuk Kerja Motor Bensin Berbahan Bakar Campuran Pertalite dan Pyrolytic Oil dari Pirolisis Kantong Plastik Berkatalis CaO Caroko, Novi; Mubaroq, Fiqih Anas; Agung Santoso, Tito Hadji; Thoharudin, Thoharudin
JMPM : Jurnal Material dan Proses Manufaktur Vol 2, No 2 (2018): DESEMBER 2018
Publisher : JMPM : Jurnal Material dan Proses Manufaktur

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AbstrakPenelitian ini bertujuan menguji secara eksperimental pengaruh penggunaan campuran minyak pirolisis dan pertalite pada torsi, tenaga, dan konsumsi bahan bakar motor bensin Honda Beat 110cc. Minyak pirolisis dicampur dengan pertalite dengan persentase volume minyak pirolisis: 0%, 5%, 10%, 20%, dan 30%. Metode yang digunakan dalam penelitian ini adalah menggunakan dynotest tool kit dan fuel consumtion test. Parameter yang diukur adalah nilai torsi, daya, dan konsumsi bahan bakar. Hasil penelitian menunjukkan bahwa pertalite murni menghasilkan torsi dan daya tertinggi dibandingkan dengan variasi campuran pertalite dengan minyak pirolisis lainnya. Hal ini dimungkinkan karena nilai viskositas pertalite lebih rendah dibandingkan dengan variasi lainnya. Konsumsi bahan bakar terendah terdapat pada variasi 70% volume pertalite dan 30% volume minyak pirolisis yang menghasilkan konsumsi bahan bakar sebesar 41,66 km/I.AbstractThis study aims to experimentally test the effect of using a mixture of pyrolysis oil and Pertalite on torque, power and fuel consumption of the 110cc Honda Beat gasoline motor. Pyrolysis oil is mixed with pertalite with the percentage volume of pyrolysis oil: 0%, 5%, 10%, 20%, and 30%. The method used in this study is to use the dynotest tool kit and fuel consumption test. The parameters measured are the value of torque, power and fuel consumption. The results showed that pure pertalite produced the highest torque and power compared to variations of the pertalite mixture with other pyrolysis oils. This is possible because the pertalite viscosity value is lower compared to other variations. The lowest fuel consumption is found in 70% volume of pertalite and 30% volume of pyrolysis oil which results in fuel consumption of 41.66 km / I.
Simulasi CFD Aliran Stratified Air-Udara pada Pipa Horisontal Sukamta, Sukamta; Thoharudin, Thoharudin; Nugroho, Dedy Melianto
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212227

Abstract

Two-phase flow can be found in industries, such as petroleum, electricity generation. In geothermal power plants, two-phase flow occurs from a mixture of water and steam which should be avoided in the piping system because it can cause equipment damage in the operating system. Therefore, an operator and engineer need a knowledge of flow patterns, phenomena and characteristics of the two-phase flow. One of the methods to predict the flow pattern is ud\sing the Computational Fluid Dynamic (CFD). This CFD simulation was modeled using Ansys Fluent 15.0 software to determine the changes of Stratified flow characteristics. The model used is Volume of Fluid (VOF). The fluid type is water and air. The variation of superficial water velocity JL of 0.025 m/s - 0.1 m/s while the superficial air velocity (JG) of 0.05 m/s - 1 m/s. The pipe used is an acrylic of 19 mm diameter and length of 1000 mm. The simulation results show that: (1). Stratified flow occurred for the low velocity of the liquid and gas phases. It was shown by the water and air are clearly separated. (2). Flow patterns are not stable, but it can change depending on the superficial velocity of gas and water. (3). The larger of JG causes the wave height because of Bernoulli’s effect so that it will make the stratified wavy or ripple flow pattern. (4). The frequency of stratified-wavy and ripple waves will tend to decrease when the JL increases, while the effect of JG is insignificant. Furthermore, it can be concluded that the speed of gas must be regulated so as not too large to the speed of water.