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All Journal Traksi : Majalah Ilmiah Teknik Mesin GEMA TEKNOLOGI Communications in Science and Technology Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Journal of Vocational Studies on Applied Research

Wiji Mangestiyono

Department Of Industrial Technology, Vocational School, Diponegoro University

Author-ID : 5289821

Aerospace Engineering Automotive Engineering Computer Science & IT Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

Published : 9 Documents Claim Missing Document

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Articles

DESAIN AIRFOIL MENGGUNAKAN SOFTWARE CAEDIUM Mangestiyono, Wiji
Gema Teknologi Vol 17, No 1 (2012): April 2012 - October 2012
Publisher : Vocational School Diponegoro University

Wiji Mangestiyono, in paper airfoil design use caedium software explain that caedium and its add-ons combine to form an easy-to-use Computational Fluid Dynamics (CFD) software system that can help to assess the performance of Â 3D model. Using Caedium add-ons can create any 2D or 3D geometry or import geometry from another CAD package. Then simulate how a gas (e.g. air) or liquid (e.g. water) will flow over and through Â geometry. Caedium is simple to learn and efficient to use. Every body can study how the physics of its model changes over time or as modify the model in real time. Caedium's unified simulation environment makes it easy to change the model on the fly and quickly see the results of the changes. Keywords : Caedium, Airfoil, Computation Fluid Dynamics

EKSPERIMEN PEMBENTUKAN KERAK GIPSUM PADA PIPA BERALIRAN LAMINIR DENGAN PARAMETER LAJU ALIR DAN ADITIF ION CU2+ : KAJIAN KINETIS Mangestiyono, Wiji; Bayuseno, A.P.; Muryanto, Stefanus
Gema Teknologi Vol 16, No 3 (2011): April 2011 - October 2011
Publisher : Vocational School Diponegoro University

Wiji Mangestiyono, , A.P. Bayuseno, Stefanus Muryanto, in this paper explain that the problem of gypsum scaling becomes a trouble for some industry in which use some water for its system. Some disadvanteges come up because of : the time of industrial process will be more longer and production cost increase necesery.To prevent the growth of scale, the experiment must be done. Researcher try to answer this problem so an experimental about kinetic study of gypsum scaling established. Flowrate would be a parameter with assume that it has effect on reaction flow. The result of Â this experiment are : reaction rate increase when flow rate increase; adition some aditives becomes reaction rate decrease. Keywords : crystal, flow rate, reactio rate, gipsum

KAJI EKSPERIMENTAL PENGARUH KETINGGIAN PERMUKAAN AIR POMPA HIDRAM DIAMETER INLET INCH DENGAN SUDUT KEMIRINGAN 15 TERHADAP KINERJA POMPA - Murni; - Indartono; Wiji Mangestiyono; Alaya Fahju; Uji Purnomo
TRAKSI Vol 16, No 1 (2016): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

Pompa hidram merupakan salah satu jenis pompa yang tidak membutuhkan energi listrik karena memanfaatkan tekanan udara dan tekanan air itu sendiri sebagai tenaga penggeraknya. Jenis pompa ini sangat cocok untuk digunakan pada daerah-daerah yang banyak sumber air namun daerah tersebut belum terjangkau oleh jaringan PLN. Pompajenis ini dapat dimanfaatkan untuk pengairan pertanian maupun untuk kepentingan rumah tangga. Penelitian ini bertujuan untuk mengetahui kinerja pompa hidram terhadap pengaruh ketinggian permukaan air dengan diameter inlet inch dan sudut kemiringan 15 0, Metode yang digunakan adalah eksperimental dengan membuat pompa hidramdengan sudut kemiringan 15 0 dan diameter inlet pompa . Penelitian dilakukan di laboratorium Diploma III Teknik Mesin Fakultas Teknik Universitas Diponegoro. Dari hasil penelitian didapat bahwa makin tinggi letak pengeluaran dari pompa hidram efisiensi akan turun yaitu untuk ketinggian 3 m mempunyai efisiensi 32,03 %, sedangkan untuk ketinggian 4 m efisiensi 12,16 % dan untuk ketinggian 5 m mempunyai efisiensi 3%.Kata Kunci : Pompa Hidram, Tanpa Listrik, Hidroulik

RANCANG BANGUN ALAT FIXED STEERING ROLLER UNTUK MENCEGAH MISTRACKING PADA BELT CONVENER Budiharja, Yuniar Anis; Darmanto, Seno; Mangestiyono, Wiji
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 8, No 2 (2022): Oktober
Publisher : universitas teuku umar

Fix the Steering Roller, Where the purpose of making this tool is to prevent mistracking on the Belt Conveyor. The manufacture of this tool was carried out considering the need for PLTU Nagan Raya 2 x 110 MW. PLTU itself is a coal-fired power plant where all coal needs from the Jetty to the Bunker are transported using a Belt Conveyor. In fact, when transporting coal using a Belt Conveyor, there are a lot of coal spills on the Belt side so that it really interferes with the work process of the conveyor belt itself. The spill was caused by a tilted conveyor belt or it could be called mistracking. Therefore, the manufacture of this tool is a solution to prevent mistracking where the installation of this tool is very easy and does not interfere with the existence of the Belt Conveyor equipment itself.

REDESIGN PULVERIZER SHAFT UNIT 2 DI PLTU SEKTOR BUKIT ASAM 4 X 65 MW Hardyanto, Arief Prakoso; Mangestiyono, Wiji; Darmanto, Seno; Murni, Murni
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 8, No 2 (2022): Oktober
Publisher : universitas teuku umar

In the operation of the Bukit Asam power plant, in all generating units there are many disturbances that can cause derating the units. Derating of the unit can occur due to decrease in the performance of the steam turbine, decrease in the reliability of the pulverizer, and also disturbances in the coal supply system and various factors. Based on the performance data of the Bukit Asam Generation Sector (Monthly disturbance report) in January 2014, there were 54 derating disturbances recorded. One of the causes of the derating was a broken Pulverizer Shaft with a loss of operating hours for 196.78 [hours] which caused an unallocated electricity loss of 12,422 [GWh]. With the realization of AFI (Action For Improvement) in this final project creation assignment, it aims to redesign the shaft pulverizer, as well as analyze the causes of the pulverizer shaft break. By redesigning the pulverizer shaft and analyzing the cause of the pulverizer shaft breaking, it was found that the cause of the fracture of the shaft made from AISI 1045 with the old design was from calculating the shear stress value of 48.44 x 107 [N/m2], this result exceeded the value of the material permit voltage of 31.8 x 107 [N/m2], so it was not safe to use and the service life was not long. The results of the redesign shaft changed the dimensions of the diameter of the shaft head which was previously 0.174 [m] in diameter to a dwelling of 0.25 [m]. The results of calculating the redesign shaft made from AISI 1045 obtained a shear stress value of 16.33 x 107 [N/m2], this result is smaller than the material clearance voltage value of 31.8 x 107 [N/m2], so it is safer with a relatively longer service life.Keywords: Derating, Pulverizer Shaft, material, Redesign, Shear Stress

Development of CaCO3 novel morphology through crystal lattice modification assisted by sulfate incorporation and vibration Mangestiyono, Wiji; Jamari, J.; Bayuseno, A.P.; Muryanto, S.
Communications in Science and Technology Vol 9 No 1 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.1.2024.1426

CaCO3 has long been used as a filler to increase many properties of the material. The filler commonly consists of inexpensive materials that replace some volume of the more expensive materials, which can reduce the cost of the final product. CaCO3 morphology that can be used as filler depends on the filler's function, such as filler for paper, paint, rubber, or composite. A filler for composite materials is needed to increase interfacing interactions between the particulate fillers and the matrix. So, the particulate in a broader shape will be the best choice to function for such filler. In this research, in an attempt to increase the interfacing interaction, CaCO3 morphology was modified in such a way through crystal lattice modification assisted by sulfate incorporation and vibration. SEM analysis was implemented, and showed that the research successfully produced novel morphology in branchy-like polymorphs. FTIR analysis also proved that the crystal lattice has been modified. The morphology in branchy-like polymorph is supposed to increase interfacing interaction between CaCO3 as the filler and the matrix. The methods are also supposed to be implemented as the research is scaled up to commercial scale.

Mechanical Properties of Commercial Recycled Polypropylene from Plastic Waste Handayani, Sri Utami; Fahrudin, Muhamad; Mangestiyono, Wiji; Hadi Muhamad, Alaya Fadlu
Journal of Vocational Studies on Applied Research Volume 3, Issue 1, Year 2021 (April 2021)
Publisher : Vocational College of Universitas Diponegoro

In Indonesia increasing the use of plastic will increase plastic waste because waste management in Indonesia is still poor. Plastics can be recycled and used to make plastic bags, toys and various household utensils, but their use is still very limited. This limitation is because the strength of recycled plastic is not as good as virgin plastic pellets, so the resulting product tends to be brittle. This study aims to determine the mechanical properties of plastics made from recycled polypropylene plastic. Five specimens are made according to the ASTM D 638 type II standard. The results show that yield strength is 16.357±2.65 MPa, elastic modulus 295,926 ± 41,97 MPa and ultimate tensile stress 19,701±1,261 MPa. The yield stress of recycled polypropylene has a lower value than the yield stress on recycled polypropylene studied by Abdelhaleem et.al or Barbosa et.al which is around 21 MPa[7][5]. This difference is possible due to the different quality of raw materials and processing.

Reliability Analysis of Fire Water Line Sutrisno, Sutrisno; Ariwibowo, Didik; Darmanto, Seno; Mangestiyono, Wiji; Saputra, Galih Satria Hendri
Journal of Vocational Studies on Applied Research Volume 2, Issue 2, Year 2020 (October 2020)
Publisher : Vocational College of Universitas Diponegoro

The purpose of this research is to analyze the reliability of firewater as a water distribution for emergency conditions. To determine the remaining useful life (RUL) of the firewater line, this research will apply the counting process so that the rate of remaining useful life (RUL) of the firewater line can be known. The data used as the basis for calculation is failure data gained from technical division databases from 2018. The data obtained will be processed using visual inspection and ultrasonic thickness test methods to produce the remaining useful life of the firewater line. From 5 example fire water lines, only 3 needed to replace of firewater line cause less than 10 years. RUL to 9 years at 10” and 12” Train C/D, 2.45 year at 14” Train C/D, 8 years at 10” and 12” Utilities I. The mathematical modeling will be verified using visual thickness and ultrasonic Test method to ensure Remaining useful life of firewater line at Badak LNG. Visual inspection refer to API 571 and ultrasonic test refer to API 570 and ASME B31.3

Failure Analysis Of Water Pump Shaft Ariwibowo, Didik; Putra, Sulthonul; Darmanto, Seno; Mrihardjono, Juli; Mangestiyono, Wiji
Journal of Vocational Studies on Applied Research Volume 1, Issue 2, Year 2019 (October 2019)
Publisher : Vocational College of Universitas Diponegoro

A water pump shaft for utility water raw material was failed. The shaft was broken into two parts. While in dismantling, the sand was found in chamber between bearing and shaft. There was also a bolt in the impeller. According to reports, the pump has been repaired and since there was no replacement shaft but the shaft was reused in reverse position. There was no inspection of the shaft when it was disconnected by operational reasons. The failure analysis of the broken-shaft was performed to investigate the cause of the failure. Two inspection and analysis were perfomed those are visual inspection and material identification and analysis. When material analysis of the shaft was carried out there was difference between examination and data specification of the shaft.The material identification indicate that the material was AISI SS 304 whereas specification data states SS 316. Both materials have similar tensile stress, so the difference was not the contributor of the failure. The present of foreign material was consider as the cause of the failure. The foreign material caused to stucked on rotation of shaft and increasing in tensile of the shaft over its ultimate strength.

Co-Authors - Indartono - Murni A.P. Bayuseno Alaya Fahju Budiharja, Yuniar Anis Didik Ariwibowo Fahrudin, Muhamad Hadi Muhamad, Alaya Fadlu Hardyanto, Arief Prakoso J. Jamari Juli Mrihardjono Murni Murni Putra, Sulthonul S. Muryanto Saputra, Galih Satria Hendri Seno Darmanto Sri Utami Handayani Stefanus Muryanto Sutrisno, Sutrisno Uji Purnomo

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