Design and Simulation of Electro-hydraulic Control Valve Based on AMESim

In this paper, the electro-hydraulic control valve commonly used in ships is taken as the research object, the working principle of the valve is introduced, the model of the valve is established by AMESim software, the model parameters are set and the simulation analysis is carried out. By changing the relevant parameters of the valve, the response speed of the valve can be improved. The simulation results show that the pressure area of load sensitive cavity and the diameter of damping hole have obvious influence on the response speed of valve.

Optimization of the Possibility of Dropping Materials on the Flip-over Bridge for Cassava Roots with Lifting Capacity of 60-80 tons

The paper presents the results of a survey on the ability to vent and dropping materials of the lift-over bridge for cassava roots with a lifting capacity of 60-80 tons based on the experimental planning model. The content of the survey on the influence of technological and technical parameters on the ability of venting/dropping materials on cassava trucks when the system of lifting-flip equipment uses transmission and hydraulic control. The research results build regression equations to show the influence relationship between the three basic structural parameters as lifting load, lift angle, distance A. Optimizing multi-objective function with Box Behnken algorithm model, the optimal conditions are as follows: A 5000 mm, lift angle 39.88 degree, lifting load 60.000 kg. Under these conditions, the highest guessing performance is 86,6%, then the objective function achieves the expected value of product clearance 99.9%, specific energy consumption 6.9 kW/h. There is no much difference in the results between the regression model and the experimental results which are similar almost similar.

Control efficiency improvement of an electro-hydraulic winch

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.

Complex shaped micro-channels generation using tools fabricated by AWJ milling process

Fabrication of complex shape micro-channels is a major challenge for manufacturing industries. Currently in commercial applications, lithography and non-conventional machining processes like lasers, electro-discharge machining (EDM) and chemical etching are commonly used for fabrication of these channels. In the present work, a novel Abrasive water jet (AWJ) milling based tool fabrication strategy has been proposed and implemented to make micro-tools (die/ electrode). The path strategy for jet movement is considered in a manner to selectively remove metal from a piece of material such that the resulting three-dimensional features become the required die shape that can be used as tool for the texturing process. Micro-tool of complex shape as fabricated on hard material (EN 31) sheet of 12 mm thickness and its geometry were analysed by controlling the step over (SO) distance. Hydraulic control based hard press contact texturing setup was developed to analyse the performance of such fabricated tools. Experiments were conducted on soft materials like, PMMA, Copper, Brass, aluminium and Nylon. Taper along the depth of the channels was observed because of the taper of the tool during fabrication. During fabrication, width of the tool less than 200 μ m was found wavi in nature as there was not enough backing material present to bear the side wise jet pressure of impinging jet. Buckling on the tools was observed with tool height greater than 1 mm.