Abstract
The paper presents a study regarding electro-hydraulic control systems for drive winches, a structural part of LARS (Launch and Recovery Systems). In the Introduction section of the paper, the authors present the domains of the research vessel. Furthermore, there is presented the importance of launch and recovery systems (LARS) and drive winches on the deck of a research vessel. The launch and recovery systems (LARS) using drive winches are installed on the stern of the research vessel. Further in the paper, the authors present the results of studying three simplified systems that use electric, hydraulic and electro-hydraulic driving solutions. Furthermore, there are presented comparative advantages of using this three types of drive winches. At the end of the paper, the authors perform an analysis of the electro-hydraulic systems for the drive winch, using a modelling and simulation software. Each schematic is presented along with its components. Moreover, the authors mention that all the schematics presented in this paper are modelled using FluidSim software from FESTO. In this case, only three mathematic relations are used in the paper: the Cauchy momentum (convective form), the incompressible Euler relations and the pressure losses in the hydraulic and electro-hydraulic drive winch.
Highlights
When attempting to model the decision-making process related to the design of a research vessel, it appears that this is very difficult for operators, [1].In the case that the authors present in this paper, it is shown the best 3D model designed for a research vessel with launch and recovery systems (LARS), as shown in figure 1.Research vessels use complex driving installations that are mounted in the stern of the vessel
Selection of one winch drive system should be based on the intended use and should be compared with weighted criteria
Pressure losses generated by the hydraulic motor will affect the overall use of the drive winch
Summary
When attempting to model the decision-making process related to the design of a research vessel, it appears that this is very difficult for operators, [1]. The authors consider that there are four reasons to use a hydraulic driven winch instead of using a DC electric driven winch: it is a very well-known fact that most equipment and machinery comply to a very simple rule: the more powerful they are, the heavier their weight This is not the case of using a hydraulic driven winch that often weights less than its electrical counterparts; DC electric driven winches often overheat if are used for a long period of time, requiring the operator to power them properly and to provide a sufficient cooling period of time before it can be used again. The Cauchy momentum equation, given in its convective form, is valid for the fluidic hydraulic driven winches, [4] In this case, relation of the convective form can be written as: Du g p (1). The hydraulic devices used for the commissioning of the drive winch include the following components, as given in table 1
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