On traditional manufactures fishing boats in Indonesia, especially in the shipyard at BaganSiapiapi, on Riau province usually made by rely on the ability of inherited tradition and hereditary not based on function and their designation.Example that way still used when determine capacity and center of gravity.This research aims to study capacity and center gravity of ship nets at BaganSiapiapi using computer simulations. On this method some of data about capacity, center of gravity, drawing design and construction of ships would to be studied systematic and accurate base on practical condition.That case would be studied and validate on the one shipyard industry at BaganSiapiapi. Some result from this study are (1) Capacity of ship nets 7093 kg and the weight is 13401.04 kg on the full condition. (2) Center weight of ship nets at X = 0.7mm; Y = 888.5mm; and Z = -162.5 mm. (3) Stability of ship nets on the without load has a smaller tilt angle compare than the full load condition.
Mechanical Engineering, Universitas Riau, Indonesia.
Input shaping technique can successfully suppresses residual vibration in slew maneuvers of flexible systems. This paper studies transient structural deflections of flexible satellite during attitude maneuvers controlled using input shaper. The satellite consists of a rigid main body and two symmetrical flexible solar panels. The equations of motion of the satellite are derived using Lagrange’s formulation, and elastic motions of flexible structures are discretized following the finite element method. The attitude maneuvers areequipped with on-off constant amplitude inputs. For fast maneuver, the satellite has poor accuracy after the maneuver. To resolve this issue, input shaper is applied to maneuver the satellite. Various fuel-efficient shaped inputs are studied in order to conclude the relation of input shape and transient maximum deflection resulted.
Department of Mechanical Engineering, UniversitiTeknologi PETRONAS, Bandar Seri Iskandar, Perak, Malaysia
In this study, temporal variation in significant wave height are studied using ERA-Interim reanalysis data from ECMWF (European Centre for Medium-Range Weather Forecasts) for 35 years period from 1980-2014. The ERA-Interim reanalysis data provides wind speed and wave height data with resolution of 1 x 1 degree. This paper studied monthly variation in significant wave height and wind speed by creating monthly data and taking the mean of those months over a period 35 years. The results show that the mean wind speed and significant wave height in the South of Java Sea have an increasing trend for all month.
Department of Ocean Engineering, InstitutTeknologiSepuluhNopember (ITS), Surabaya, Indonesia
