Energy saving systems of hydrostatic drives for ship deck machines

• Autorzy: Skorek G.

Identyfikatory

DOI

10.2478/ntpe-2018-0063

• Języki publikacji: EN

Abstrakty

EN

A control system with a proportional directional throttling control valve or a directional control servo valve, controlling a cylinder (linear hydraulic motor) is used in the ship steering gear drive, in the controllable pitch propeller control, in the variable capacity pump control system for hydraulic deck equipment motors or fixed pitch propellers in small ships (for example ferries). Energy savings in a constant capacity pump operation can be achieved by means of overflow valve controlled by the oil outlet pressure between the directional throttling control valve and the cylinder. Although structural volumetric losses cannot be eliminated in such a system, but it is possible to reduce considerably structural pressure losses, mechanical losses and volumetric losses in the pump, and mechanical losses in the cylinder too. The paper discusses these energy savings using an earlier developed by Paszota mathematical model of losses in elements, the energy efficiency of the system and the operating range of the cylinder. The paper also presents a comparison of the energy behavior of two widespread structures of hydrostatic systems: a standard individual systems with a throttling steering fed by a constant capacity pump. Both system solutions are described and equations of the total efficiency η of the system are presented. Diagrams of energy efficiency of two hydraulic systems working at the same parameters of a speed and a load of hydraulic linear motor, which were different due to structure and ability of energy saving, were presented and compared.

Słowa kluczowe

EN

energy efficiency; power of losses; hydrostatic system; throttling steering; hydraulic linear motor

PL

efektywność energetyczna; siła strat; układ hydrostatyczny; sterowanie dławieniem; hydrauliczny silnik liniowy

• Wydawca: STE GROUP ; De Gruyter
• Czasopismo: New Trends in Production Engineering
• Rocznik: 2018
• Tom: Vol. 1, Iss. 1
• Strony: 507--514
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Skorek G.

• Gdynia Maritime University, Poland

Bibliografia

• 1. Paszota Z. (2000). Energy efficiency of hydraulic cylinders in servo-mechanism. Conference proceedings. Naval Arch. Marine Eng. 2000, pp. 139-147.
• 2. Paszota Z. (2003). Energy aspects of hydrostatic drives. Polish Maritime Research, Vol. 10, 2/2003, pp. 18-20.
• 3. Paszota Z. (2004). An Energy Behaviour Comparison of two Kinds of Hydrostatic Drive of Ship Deck Machines. Brodogradnja – Journal of Naval Architecture and Shipbuilding Industry, Brodarski Institut Zagreb, Vol. 52, 3/2004, pp. 213-222.
• 4. Paszota Z. (2007). Energy saving in a hydraulic servomechanism system – theory and examples of laboratory verification. Brodogradnja, 58/2007, pp. 146-157.
• 5. Paszota Z. (2009). The operating field of a hydrostatic drive system parameters of the energy efficiency investigations of pumps and hydraulic motors. Polish Maritime Research, 4 (62) 2009, Vol. 16; pp. 16-21.
• 6. Paszota Z. (2013). Losses and energy efficiency of drive motors and systems. Replacement of the Sankey diagram of power decrease in the direction of power flow by a diagram of power increase opposite to the direction of power flow opens a new perspective of research of drive motors and systems. Polish Maritime Research, Vol.20, No 1 (77), 2013, pp. 3-10.
• 7. Paszota Z. (2015). Energy losses in hydrostatic drive. Monography, LAP Lambert, Acadamic Publishing.
• 8. Skorek G. (2010). Energy characteristics of the hydraulic system with proportional control of cylinder, fed by a constant capacity pump in a constant pressure and variable pressure system (in Polish). Doctor dissertation. Gdansk University of Technology, Faculty of Ocean Engineering and Ship Technology.
• 9. Skorek G. (2012). Graphical interpretation of the power of energy losses and power developed In the hydrostatic drive and control system elements. Polish Maritime Research, 4/2012, pp. 44-53.
• 10. Skorek G. (2013). Energy efficiency of a hydrostatic drive with proportional control compared with volumetric control. Polish Maritime Research, 3/2013, pp. 14-19.