The Experts below are selected from a list of 45 Experts worldwide ranked by ideXlab platform

Wisnu Wardhana - One of the best experts on this subject based on the ideXlab platform.

  • Strength Analysis and Sea-Fastening Design of Container Crane Structure for Heavy Lifting Sea Transportation
    Applied Mechanics and Materials, 2020
    Co-Authors: Wisnu Wardhana, Yoyok Setyo Hadiwidodo, Faisal Siswanto
    Abstract:

    This paper discusses heavy-lifting Sea-transportation of 831-ton container-crane in Indonesia from Surabaya to Kupang. Structural strength analysis is carried out to ensure the safety of the crane during the transportation process. The purpose of this analysis is to design the Sea-Fastening construction capable of redistributing the excessive stress that might occurred, to avoid structural failure. The first step is to model the crane structure and barge under certain various drafts. This is important because selection of the proper draft will determine the suitable righting moments of barge and hence to ensure good stability. The selected drafts under investigation are taken between 0.25 T to 0.75 T. The result of the structural strength calculation shows that the static load is found around 8150 kN. Loads due to motion of barge for heave, roll, and pitch motions are 116 kN, 7424 kN, and 232kN, respectively. Location of the high stress due to the motion is identified at the bottom of the crane structure so that the design of Sea-Fastening constructions will be concentrated in the vicinity of this position. The values of Unity Check after fitting the Sea-Fastening construction are reduced to 0.940, 0.704, and 0.702, respectively. It is concluded that the structure of container crane under such Sea-Fastening design is proven to be capable of overcoming the loads during transportation process.

  • KAJIAN ASPEK TEKNIS PROSES MARINE HEAVY TRANSPORT AND LIFT UNTUK GANTRY CRANE 2x600 Ton
    2008
    Co-Authors: Wisnu Wardhana
    Abstract:

    Transportation of two gantry cranes 2x600 tonnes from Semarang container port to Banjarmasin under relatively heavy Seas, has been carried out successfully.This was due to a careful assessment involving some technical aspects, i.e. structurals strength calculation of the cranes and barge, motion and stability, loading and unloading aspects, Sea Fastening system and other related naval architect and engineering aspects.This activity has shown that detailed strength calculation and the SeaFastening system design of the cranes must have carefully been done since the cranes are already 25 years old and were not designed to withstand acceleration that can reach 0.5G due to barge’s motion. Safety factor of 1.5 was taken to include the uncertainty.A single standard 300 ft barge was used to transport both cranes in one way, under average speed of 4-5 knots across Java Sea.

Vijoy Koottungal - One of the best experts on this subject based on the ideXlab platform.

  • Dynamics of Heavy Deck Lift-Off From Transportation Barge
    Volume 1: Offshore Technology, 2012
    Co-Authors: Rahul Kanotra, Mohamed Aboumalwa, Sajith Nair, Vijoy Koottungal
    Abstract:

    The size of present day offshore topsides are growing rapidly, with large capacity, complex modules being transported and lifted offshore. This increase in size results in offshore lift weights which are near crane capacity of HLVs (heavy lift vessels). The offshore installation operation involves lift-off of heavy modules from a transportation barge moored perpendicular to the stern of the HLV. Previous experiences with lift analyses indicate that most significant hook load occurs while the module is being lifted off the transportation barge. This can be attributed to the fact that the crane vessel, topside and the transportation barge are all dynamically coupled together and during the “lift-off” condition the module experiences upward and downward impulsive forces from the transportation barge, which in turn increase the apparent weight of the module and hence the hook loads. This paper studies the dynamics of heavy deck lift-off from the transportation barge, when the Sea Fastening from the module has been removed and all three bodies (transportation barge, HLV and Module) are mechanically coupled through slings, lashings and fenders. The effect of various crane line pretensions, wave, current and wind has been investigated and the resulting DAFs (dynamic amplification factors) of the hook loads have been compared. The effect of wind and current on the lift operation has also been investigated. The “lift in air” case has been studied and compared with the “lift off” case. Multi Operational Structural Engineering Simulator (MOSES) has been used to carry out 3D time domain analysis of lift off and lift in air cases. McDermott’s HLV, 300 class transport barge and a topside weight of 1,500MT have been analyzed for the study.Copyright © 2012 by ASME

Faisal Siswanto - One of the best experts on this subject based on the ideXlab platform.

  • Strength Analysis and Sea-Fastening Design of Container Crane Structure for Heavy Lifting Sea Transportation
    Applied Mechanics and Materials, 2020
    Co-Authors: Wisnu Wardhana, Yoyok Setyo Hadiwidodo, Faisal Siswanto
    Abstract:

    This paper discusses heavy-lifting Sea-transportation of 831-ton container-crane in Indonesia from Surabaya to Kupang. Structural strength analysis is carried out to ensure the safety of the crane during the transportation process. The purpose of this analysis is to design the Sea-Fastening construction capable of redistributing the excessive stress that might occurred, to avoid structural failure. The first step is to model the crane structure and barge under certain various drafts. This is important because selection of the proper draft will determine the suitable righting moments of barge and hence to ensure good stability. The selected drafts under investigation are taken between 0.25 T to 0.75 T. The result of the structural strength calculation shows that the static load is found around 8150 kN. Loads due to motion of barge for heave, roll, and pitch motions are 116 kN, 7424 kN, and 232kN, respectively. Location of the high stress due to the motion is identified at the bottom of the crane structure so that the design of Sea-Fastening constructions will be concentrated in the vicinity of this position. The values of Unity Check after fitting the Sea-Fastening construction are reduced to 0.940, 0.704, and 0.702, respectively. It is concluded that the structure of container crane under such Sea-Fastening design is proven to be capable of overcoming the loads during transportation process.

G U Junju - One of the best experts on this subject based on the ideXlab platform.

Wang Dongjiao - One of the best experts on this subject based on the ideXlab platform.

  • CALCULATION OF MAXIMUM INERTIAL FORCES FOR THE TRANSPORTATION OF OFFSHORE PLATFORMS ON SHIPS
    China offshore Platform, 2020
    Co-Authors: Wang Dongjiao
    Abstract:

    Sea-Fastening design should be undertaken for the transportation of the offshore platforms on ships to ensure that the offshore platform on ships is safe in the transportation. In the calculation of exter nal forces, the loads caused by gravity components of pitch or roll motion and the inertial forces caused by ship motions are the most important. They are dependent on motions of ship, the mass of platform and the loading position of the platform, etc. Combined loads in the ship - bounded axes system are given by adding the gravity loads and the inertial forces together. Ship motions are calculated based on the Sea ?keeping theory, the effects of coupling and varying phases between each motion are considered. 3D Green 's integral equation method is adopted to determine the added mass, damping and wave exciting forces in the equations of motion.