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Engineering around a hydraulic controlled gearbox
On board of a hopper dredger large centrifugal pumps are pumping a water-sand mixture from the river- or seabed into the hopper. Optimizing this dredging process demands control of the speed of the dredge pump. The dredge pump in the hopper dredger 'Waterway' and there sister ship 'Coastway' (these hopper dredgers are relative small vessels so they have only one dredge pump) are powered via a PTO shaft from the starboard 6L20 Wärtsilä main engine. The gearbox is a two speed gearbox with a special hydraulic driven planetary gear wheel carrier in order to control the speed of the dredge pump in a limited way when operating in speed 1 or in speed 2. The planetary gear wheels in this gearbox are Cylkro gears instead of bevel gears. Output shaft power of the gearbox in speed 1 is 1500 kW, speed control of the output shaft from 190 to 240 rpm, and in speed 2 2700 kW, speed control of the output shaft from 300 to 370 rpm. The main objective of this paper is to show the power of Bondgraphs for the practical engineer in modelling combined hydraulic-mechanical systems for torsional vibration analysis. Compared with other common techniques of representation such as differential equations, transfer functions and block diagrams, Bondgraphs have the advantage of being interdisciplinary and provide a graphical representation of the interactions among all components in a system. The Bondgraph provides a logical procedure for transposing a physical reality into a mathematical model, which is amenable to direct computer solution. The simulation output fits well with the measurements, providing evidence that the simplifications in modelling the system where allowed for the purpose to determine the natural frequencies of this system. The simulation was done after the design and construction of the gearbox with the hydraulics and the conclusion is that when the simulation was done during the design stage of the system, the hydraulics of the system would have been more optimized. So proper engineering in the design stage is important and the currently available modelling and simulation software make that possible.
Engineering around a hydraulic controlled gearbox
On board of a hopper dredger large centrifugal pumps are pumping a water-sand mixture from the river- or seabed into the hopper. Optimizing this dredging process demands control of the speed of the dredge pump. The dredge pump in the hopper dredger 'Waterway' and there sister ship 'Coastway' (these hopper dredgers are relative small vessels so they have only one dredge pump) are powered via a PTO shaft from the starboard 6L20 Wärtsilä main engine. The gearbox is a two speed gearbox with a special hydraulic driven planetary gear wheel carrier in order to control the speed of the dredge pump in a limited way when operating in speed 1 or in speed 2. The planetary gear wheels in this gearbox are Cylkro gears instead of bevel gears. Output shaft power of the gearbox in speed 1 is 1500 kW, speed control of the output shaft from 190 to 240 rpm, and in speed 2 2700 kW, speed control of the output shaft from 300 to 370 rpm. The main objective of this paper is to show the power of Bondgraphs for the practical engineer in modelling combined hydraulic-mechanical systems for torsional vibration analysis. Compared with other common techniques of representation such as differential equations, transfer functions and block diagrams, Bondgraphs have the advantage of being interdisciplinary and provide a graphical representation of the interactions among all components in a system. The Bondgraph provides a logical procedure for transposing a physical reality into a mathematical model, which is amenable to direct computer solution. The simulation output fits well with the measurements, providing evidence that the simplifications in modelling the system where allowed for the purpose to determine the natural frequencies of this system. The simulation was done after the design and construction of the gearbox with the hydraulics and the conclusion is that when the simulation was done during the design stage of the system, the hydraulics of the system would have been more optimized. So proper engineering in the design stage is important and the currently available modelling and simulation software make that possible.
Engineering around a hydraulic controlled gearbox
Schwingungsanalyse eines Schwimmbaggers mit Bondgraph
Heeringa, T. (author)
2004
26 Seiten, 16 Bilder, 20 Quellen
Conference paper
English
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