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IPTEK The Journal for Technology and Science
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : 08534098     EISSN : 20882033     DOI : -
Core Subject : Science,
Computer Science & IT
IPTEK The Journal for Technology and Science (eISSN: 2088-2033; Print ISSN:0853-4098), is an academic journal on the issued related to natural science and technology. The journal initially published four issues every year, i.e. February, May, August, and November. From 2014, IPTEK the Journal for Technology and Science publish three times a year, they are in April, August and December in online version.
Arjuna Subject : -
Articles 3 Documents
 1 
Search results for , issue "Vol 27, No 2 (2016)" : 3 Documents clear
Maritime Weather Prediction using Fuzzy Logic in Ternate Waters North Maluku Sangadji, Anisa; Aisjah, Aulia Siti; Nugroho, Gunawan
IPTEK The Journal for Technology and Science Vol 27, No 2 (2016)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1011.444 KB) | DOI: 10.12962/j20882033.v27i2.1146

Abstract

Ternate waters of North Maluku is one of Indonesian eastern waters whose maritime weather is often unpredictable. Weathers prediction is important to avoid accidents in the waters. The aim of this research is to obtain              a predictor model of wave’s height and current’s speed suitable for the Ternate waters using Takagi-Sugeno fuzzy logic. The data used is data from BMKG Maritime of Bitung which recorded per 6 hours during 5 years from July 2010 – June 2015. In order to reach accuracy of > 85%, 3 model predictor’s that used waves height and current speed are predictor Model A, Model B and Model C. Each model uses different input and total membership function. The result of this research shows that the Model C is the best model for Ternate waters. Model C uses 4 membership functions for 3 input variables. Inputs of waves height predictor consist of the actual wind speed (U(t)), actual waves height (H(t)) and waves height 6 hours ago (H(t-6)) and accuracy percentage of waves height 6 hours ahead (H(t+6)) is 91,99%; while inputs of current speed predictor consist of actual wind speed (U(t)), actual current speed (Cu(t)) and current speed 6 hours ago (Cu(t-6)) and accuracy percentage of current speed 6 hours ahead (Cu(t+6)) is 81,63%.
Multicylinder Engine Shaking Forces and Moments Samuel Doughty
IPTEK The Journal for Technology and Science Vol 27, No 2 (2016)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (573.64 KB) | DOI: 10.12962/j20882033.v27i2.1216

Abstract

The dynamic forces and moments arising from the motion of internal components in IC engines are known as Shaking Forces and Shaking Moments. Thes forces and moments are transmittted directly  to the supporting  structure,  whether  it be a concrete  block or a ship's  frame. They can cause significant damage if not properly evaluated at the design stage. It should be noted that these are inertial reactions only, and are unaffected by cylinder firing pressure.  By a driect appeal to fundamental momen- tum principles, this paper presents an elegant and completely general approach to their determination, based on fundamental momentum principles.  This is much more simple than the conventional direct approach through the piece-by-piece application of Newton's Second Law
Subsea Gas Pipeline Risk Assessment During Hot Tapping Installation Ketut Buda Artana; I Made Ariana; A.A.B. Dinariyana; Dhimas Widhi Handani; Emmy Pratiwi
IPTEK The Journal for Technology and Science Vol 27, No 2 (2016)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (562.512 KB) | DOI: 10.12962/j20882033.v27i2.1294

Abstract

This paper examines the risk to subsea gas pipeline during hot-tapping installation process. Hot tapping is one method to connect new pipeline to existing pipeline while they remain in service. In this study it is considered that hot tapping is installed using crane barge. To assure the crane barge in steady position, the crane barge is moored by means of mooring chain at several locations. These mooring activities and hot tapping installation possess potential risk to existing subsea facilities. Hence, in general there are two objectives in this study such as: determining the safe distance between mooring chain for and the existing facilities, and performing risk level due to external load that may occurs during installation. The risk level is determined by analyzing frequency and its consequence then will be mapped into risk matrix according to DNV-RP-F107. From mooring distance analysis, the result can be used as a reference for positioning the mooring point of crane barge. Based on the result of risk assessment to facilities, risks due to external load such as dropped anchor, dragged anchor, ship sinking and dropped object are in the as low as reasonably practicable (ALARP) region which mean, in the practical life risks are acceptable as long as the frequency is maintained in the lowest rank. 

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