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INDONESIA
Media Teknika
Published by Universitas Sanata Dharma
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
Arjuna Subject : -
Articles 54 Documents
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Penentuan Parameter Setting Mesin Pada Proses Corrugating Sylvia Ongkowijoyo; Ig. Jaka Mulyana; Julius Mulyono
Media Teknika Vol 11, No 1 (2016)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v11i1.512

Abstract

Corrugating process is the process in making carton box which is merging the top sheet of kraft paper (top liner), wave paper (paper medium) and kraft paper bottom (bottom liner) using glue. Output of corrugating process is corrugated sheet. The parameter of quality corrugated sheet is bursting strength. In the corrugating process, the value of bursting strength is influenced two factors: the speed and temperature of corrugator. In this study, we discuss the experiment to determine level of corrugator speed and temperature that can produce the maximum bursting strength. Response Surface Methodology (RSM) is used to design of experiment and analysis. RSM able to identify points outside the experimental area (order model I) and determine the point of maximum response with the method of steepest ascent, and may explain the relationship of quantitative independent variable responses (order model II). The result of this study is that optimum levels engine speed is 178 m / min and level temperature of 174.9 C. The optimum level of value response bursting strength of 13.8 kgf /mm2.
Karakteristik Briket Arang Sekam Padi dan Arang Kulit Bawang Putih Mohammad Nurhilal; Roy Aries Permana Tarigan
Media Teknika Vol 12, No 2 (2017)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v12i2.1081

Abstract

Indonesia is endowed with abundant natural wealth capable of being transformed into an energy source. However, until now the utilization of natural resources can not be optimally processed. One alternative solution to make the fuel as a substitute for LPG is to fuel the briquettes. The general purpose of this research is the manufacture of briquettes from waste materials such as rice husk and garlic skin. While the specific purpose of this research is to know the characteristic of proximate briquettes such as: water content, ash content, fixed carbon, volatile matter, and calorie briquettes, variations of glue composition glue 200, 250, 300 gram, kanji starch composition 20, 30, and 40 gram and paper pulp 50 w / w and 100 w / w of total weight of adhesive 20 gram, and jelantah cooking oil. Methods in this research are experimental approaches such as, making briquettes, and testing the characteristics of briquettes. The results of research on water content, ash content, fixed carbon, volatile matter and calorific briquettes of rice husk huskers were 33,493%, 39,966%, 29,058%, 30,923% and 3873,500 kal / gram respectively. While the characteristics of garlic skin briquettes produced the highest price respectively 35.986%, 9.650%, 42.373%, 34.479%, and 4783.654 cal / gram.Keywords: Characteristics of briquettes, rice husk, garlic skin.
Analisis Tegangan Roda Gigi Miring pada Transmisi Kendaraan Roda Empat berdasarkan AGMA dan ANSYS Hadi Sutanto
Media Teknika Vol 12, No 1 (2017)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v12i1.943

Abstract

Two kinds of stresses in the gear teeth are root bending stress and tooth contact stress. These two stresses results in the failure of gear teeth. The root bending stress results in fatigue failure and contact stress results in pitting failure at the contact surface. The stress analysis used to minimize gear failure in the design of helical gear. It is also optimize the design of helical gear on the transmission system of the truck motor vehicle, where the power transmission is required at heavy loads with smoother and noiseless operation. In this paper bending stress and contact stress estimated using analytical method while modeling of gears used the numerical solution. Method of beam strength based on modified Lewis calculation used to predict the bending strength of helical gears. Contact stress was estimated using related method of AGMA contact stress. Stress modeling of helical gears is done by ANSYS 14.5, which is a finite element analysis package. The results are then compared with both AGMA and ANSYS procedures. The values of bending strength and contact stress determined using AGMA method found to be compatible with ANSYS simulation.
Aplikasi Web Service Perbankan untuk Pembayaran Formulir Pendaftaran Mahasiswa Baru Puspaningtyas Sanjoyo Adi
Media Teknika Vol 12, No 2 (2017)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v12i2.1087

Abstract

The new student registration process begins with the process of filling out the registration form where to get it, the prospective student pays to get the form. Sanata Dharma University cooperates with the bank to develop an application to pay registration form with web service technology. The advantage of this technology is electronic service and can work 24 hours. Web service technology is a service that allows communication between machines performed through a computer network with HTTP protocol web server. The web service application was developed and implemented by Sanata Dharma University and CIMB Niaga bank in October 2017. From the observation of January 2018 compared to January 2017, the January 2018 transaction increased by about 12% compared to January 2017. The proportion of web service transactions is around 30% of total transactions where 80% of them are conducted outside office hours. This data indicates that the knowledge of electronics services of prospective students and their parents is good enough.Keywords: web service, registration form, new students
PENERAPAN MODEL MULTIMEDIA SEBAGAI MEDIA PEMBELAJARAN ALTERNATIF UNTUK MENINGKATKAN SELF MOTIVATED LEARNING DAN SELF REGULATED LEARNING Emiliana M Moelbatak; Yulianti Paula Bria
Media Teknika Vol 11, No 2 (2016)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v11i2.519

Abstract

Teknologi multimedia merupakan Salah satu teknologi yang ditawarkan dalam media pembelajaran alternatif untuk dimanfaatkan dalam dunia pendidikan saat ini. Hardcopy yang digunakan dalam Proses Belajar Mengajar terkadang menyulitkan pelaku pendidikan dalam hal mengakses dan menerima informasi secara cepat dan realtime, sehingga memunculkan ide untuk mengembangkan materi pelajaran dalam bentuk multimedia, yang akan memudahkan pendidik dan peserta didik dalam menjalankan aktivitas dalam PMB. Kejenuhan belajar akan muncul Apabila pendidik selalu menggunakan metode yang konvensional secara terus menerus dan tanpa ada variasi, karena tidak ada warna baru dalam PBM. Implikasi dari metode belajar secara konvensional yang digunakan oleh tenaga pendidik, menunjukkan bahwa 20% atau lebih peserta didik kurang antusias dan berminat mempelajari materi, 35% atau lebih peserta didik kurang mempunyai inisiatif untuk mencari atau memperdalam wawasan melalui referensi lain selain yang diberikan oleh tenaga pendidik. Permasalahan lain adalah, ketersediaan sumber belajar di perpustakaan sangat minim, sehingga materi yang didapat pun kurang up to date. Hal ini semakin memperkuat permasalahan kurang berminat dan rendahnya inisiatif peserta didik dalam proses belajar mengajar.Pada penelitian ini,dikembangkan multimedia dan pemodelan multimedia yang dapat meningkatkan Self Motivated Learning dan Self Regulated Learning dengan menggunakan metode penelitian pengembangan research and development, dan analisi akhir dilakukan pengujian dengan bantuan SPSS.Model digitalisasi media pembelajaran ini mampu membuat peserta didik menjadi tertarik untuk belajar secara aktif dan mandiri.
Unjuk Kerja Model-Model Kincir Angin Savonius Dua Tingkat Dengan Kelengkungan Sudu Termodifikasi Ir. Rines
Media Teknika Vol 11, No 1 (2016)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v11i1.513

Abstract

Savonius windmill is a kind of vertical axis windmill which is potential used to capture the energy from the wind. This researchs objective is to investigate about the dimension effects on the performance of the Savonius windmill models with modified curves and blades configuration. All of the models were made in two stages which each stage have two blades. Six dimension variations of windmill models has been made and investigated in range from 0.432 m2 to 0.552 m2. This research was conducted in a wind tunnel at wind speed range between 4 m/s to 7 m/s. The results showed that there were effects of the dimension of windmill on its performance. The lowest value of peak power coefficient is produced by a windmill model 92 cm of rotor,s diameter and 60 cm in height, that is about 0.31 at tip speed ratio 1.08. The highest one is produced by windmill model 60 cm of rotor,s diameter and 92 cm in height, that is about 0.49 at tip speed ratio 1.18.
Pelacak Matahari Dua Sumbu Menggunakan LDR untuk Meningkatkan Absorbsi Matahari Elang Parikesit; Doddy Purwadianto; FA. Rusdi Sambada
Media Teknika Vol 12, No 2 (2017)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v12i2.1082

Abstract

The position of the sun in the sky always changes periodically. A lot of research has been doneto follow the sun's motion using a solar tracking system to increase the amount of solar energy that can be absorbed. The solar tracking system can be grouped into passive and active system. Active sun tracker system uses motor drive in following the motion of the sun. The current active tracking system is using one or two rotary axis. Active two-axis solar tracking system provides greater efficiency and effectiveness than one-axis solar tracking system. This study aims to increase the absorbable sun energy with a simpletwo-axis solar tracking system. This research has been done by experimental method by making a model of two-axis sun tracker and its field data retrieval. The main parts of the model in this study are (1) LDR sensor, (2) microcontroller and (3) motor drive. Initial data of field test results shows a maximum increase (269%) in absorbable solar energy on a model using a sun tracker than models that d o not use a solar tracking systemKeywords: tracker, sun, two-axis rotate, simple
Gas Pipeline Hydrodynamic Analysis Based on Beggs-Brill Correlation Achilleus Hermawan Astyanto
Media Teknika Vol 11, No 2 (2016)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v11i2.291

Abstract

A reliable pipeline design requires hydrodynamic analysis. The analysis enables flow rate and pressure gradient investigations in obtaining an optimum configuration. In the other hand, a numerical approach occurs as a complex schematic is proposed. Solving this requirement, an iterative method is posible to be endorsed. This study aims to investigate single-phase gas pipeline hydrodynamic analysis. A model utilized a two-phase pressure gradient correlation, namely Beggs-Brill correlation, to converse single-phase gas pressure gradients into mass flow rates. Furthermore, the numerical method, called Newton-Raphson, is assesed on solving those iterative calculations. The results show that the model is able to solve a complex schematic. The mass flow rates obtain in the deviation up to 0.4 %, whereas the pressure gradients deviation is achieved on a higher value.
Pengaruh Hard Chrome Plating pada Peningkatan Kekerasan Baja Komponen Kincir Budi Setyahandana; Yohanes Eko Christianto
Media Teknika Vol 12, No 1 (2017)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v12i1.944

Abstract

High carbon steel generally has a high hardness but lower ductility. To obtain a hard and ductile material, surface hardening can be done on a low carbon steel. Surface hardening can be achieved by hard chrome plating. The objectives of this research were: (1) Conducting the process of hard chrome plating on low carbon steel, (2) Knowing the increasing of surface hardness of low-carbon steel after the plating process in time variations, (3) Knowing the increasing of surface hardness of the low carbon steel after the coating process in anode-cathode distance variations. The specimens was made of low carbon steel. The size of the specimen were 40 mm in length, 35 mm in width and 6.8 mm in thickness. The variables measured were: (1) Coating time (t), (2) The distance between the cathode and anode in the coating process (l). After the coating process completed, the specimen surface hardness was measured by Vickers Hardness Tester. The results showed that up to 532 HV, low carbon steel hardness increased linearly at increasing time plating. At 120 minutes plating, the hardness also increased linearly at current densities up to 1.05 amperes/dm2. While at the current density of 1.1 amperes/dm2, the hardness increased significantly higher.
Analisa Kinerja Lemari Pendingin Alami Sebagai Penyimpan Sayur dan Buah-buahan dengan Media Pendingin Air Tulus Burhanuddin Sitorus; Tekad Sitepu
Media Teknika Vol 11, No 2 (2016)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v11i2.520

Abstract

One application of direct evaporation cooling system was a natural refrigerator. The advantages of this natural refrigerator was operating without using electrical energy or mechanical energy and environmentally friendly. This study aims to gain a performance analysis of natural refrigerator as a store of vegetables and fruits which uses water as the cooling medium. Material of natural refrigerator consists of teak wood and gunny. Experiments were conducted during seven days in the open space which exposure to solar radiation. The measurement of weather parameter was done by using HOBO devices and to record temperature changes of vegetables and fruits in the natural refrigerator was used acquisition data. The results showed that the efficiency of natural refrigerator maximum that can be obtained was 14.7% with an average air temperature of 25,55oC, air humidity average of 91.34% and an average solar radiation of 108.45 W/m2. The experimental data showed that the freshness of vegetables and fruits heavily influenced by weather conditions.

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