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All Journal Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)

Dodi Sofyan Arief

Department of Mechanical Engineering, Universitas Riau, Indonesia

Author-ID : 3503409

Aerospace Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Articles

Performance of Universities based on Research Output J Koto; M Syukri; Dodi Sofyan Arief
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 61 No 1 (2018): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (666.133 KB)

Performance of universities based on research ranking has become a trend to gauge the credibility and quality of the university. One of the parameters used to assess university ratings is the result of research in the form of papers, patents, copyrights. Therefore, universities in the world compete to publish research results in the form of journals or conferences and others. This paper discusses on performance of universities based on research output. The results of research index in developed countries shows that there is not much change from year to year, it may be said that it almost reaches a saturation point. On the other side of the earth, the increase in research results in ASEAN countries is still high, reaching 70-80 percent. More impressive, universities in Indonesia have tried very enthusiastically in the study as the percentage increase was 500%

Automatic Control System Design of the Threshing Station Model, Case Study in PT. Perkebunan Nusantara V-PKS Sei Galuh Amir Hamzah; Dodi Sofyan Arief; Galuh Leonardo Sihombing; Andri Andri
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 45 No 1 (2017): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

This paper presents a design for the automatic control system of the threshing station model using PLC Zelio smart relay. Threshing station is a station where a process of separation palm kernel from the bunch by way of slamming into a rotating drum. The threshing station model is a shape which resembles of the threshing station palm oil mill of PT. Perkebunan Nusantara V- PKS Sei Galuh, it has been scaled 1:8. PLC (Programmable Logic Controller) is a microprocessor based on instrument that can be programmed to control the machining process automatically. This system design has 2 inputs and 3 outputs. The inputs are push button to turn on and turn off of the works system and a rotary encoder sensor to detect rotating screw conveyor. The outputs are 3 units of DC motors. The programming language is used the ladder diagram by using the Software Zelio Soft 2. This system includes design of ladder diagram program, design of control system on auto feeder and design of rotary encoder sensor. The result of this design is revealed that auto feeder runs automatically turn on for 60 seconds and turn off for 30 seconds, continuously. The sensor works with voltage is 4.4 Volt at the moment un-stunted and 0.1 Volt when the stunted.

Fracture Surface of OPEFB Fiber Reinforced Polymer Composites-Polymeric Foam Sandwich Panels under Static Loading Conditions Muftil Badri; Dodi Sofyan Arief; Erik Sitio Johanes; Ridho Zarli Rahmat
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 48 No 1 (2017): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

The fracture surface of oil palm empty fruit bunch (OPEFB) reinforced polymer composites sandwich panels depends on different fibers treatment was experimentally investigated under static loading conditions. The static uniaxial tensile and flexural loading for three treatment modes on OPEFB fibers was implemented using servo hydraulic material testing machine. The microstructure was observed using SEM observation in order to better understand damage mechanism during the stress of polyester phase. SEM observation on fracture surface can provide important information for research and development as well as fracture analysis. It was found that fracture modes were considerably different for these composites. OPEFB fibers was soaked with 5% NaOH solution for 2 hours are not removed from the matrix composite. It means the interface bonds of OPEFB fibers can be controlled against the polymer matrix. Damage to polymer matrix interface and OPEFB fiber are boiled with water at temperatures of 50º C to 80º C for 30 minutes due to flexural test.

Management of Motorcycle Workshops of SMEs Scale Based on Information System Dodi Sofyan Arief; Anita Susilawati; Johar Simaskot; Muftil Badri; M. Dalil
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 47 No 1 (2017): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

The good workshop management must also be supported by a properly administration, in order to record all the resources that become workshop assets. Moreover, the motorcycle workshop also conducts spare parts sales to complete the replacement needs of broken vehicle spare parts. This study aims to analyze and design a workshop information system for Small and Medium Enterprises (SMEs) engaged in the field of repairing of motorcycle. Generally, the SMEs scale of motorcycle workshops in this research still uses a simple management system and manually in presenting the data required by the workshop. This it make difficult and inconvenient for the owner of a SMEs scale of motorcycle workshop. Sequence, it is necessary to optimalize the management system from the simpler manual system to be computerized. Stages of the method in this study: (1) survey of general workshop management SMEs scale, (2) do analysis of data obtained during the survey and provides input for workshop management based on 5S method, (3) to design and create information systems and databases using PHP (Hypertext Preprocessor) as the programming language and MySQL as the database. The approach of the 5S (Sort, Straighten, Shine, Standardize, Sustain) and creating an information system can manage equipments and properly administration in SMEs scale of motorcycle workshops. Therefore, they can help to optimize streamline the services and administration activity of SMEs scale of motorcycle workshops.

Sieving Machine Calibration Using a Profile Projector with Standard Method ASTM E-11 2004 Muftil Badri; Dodi Sofyan Arief; Aji Mahmud Solih; Dyna Ayunita; Afdila Muflihana
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 57 No 1 (2018): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (314.411 KB)

Sieving machine is used to sift material of sand and stone previously mixed. Sieve machine is a measuring instrument to determine the size of sand grains that can be used in building construction. The purpose of this research is to calibrate the sieving machine using profile projector with standard method ASTM E-11 2004. Based on this research, the conclusion of calibration data of sieving machine has been obtained. It was found that the sieving machine used in this research can be used to determine the size of sand grains used for construction. The uncertain value of the width opening sieve is 15.8 μm and the diameter of wire is 0.02 mm, so that the value of evaluation is lower than the allowed geometry deviation limit. Thus it can be concluded that the sieve machine is still within the permissible geometry tolerance limit

Co-Authors Afdila Muflihana Aji Mahmud Solih Amir Hamzah Andri Andri Anita Susilawati Dyna Ayunita Erik Sitio Johanes Galuh Leonardo Sihombing J Koto Johar Simaskot M Syukri M. Dalil Muftil Badri Ridho Zarli Rahmat

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