The experimental identification and graphical verification of flow-and torque-loss and coefficient of efficiency in the work space is needed for designers, to set up the static performance specifications and diagnosis of hydraulic pumps and motors. This paper presents and proposes an experimental based method for identification and modelling of flowand torque-loss for hydraulic motors. The method is based on least-square approximation technique. As an example, the experimental results and modelling results obtained with gerotor type motors on the dynamometer are presented and discussed. A bi-directional computer controlled dynamometer system is applied to carry out the necessary measurements.
The paper presents and discusses a R&D-view on trends in development and best practise in design of both low- inexpensive, readily available and easily disposable. The low-pressure tap water hydraulic systems cover up to around 50 bar, and 2-4kW having a strong potential to compete with pneumatic and electrical solutions in many applications. The high-pressure water hydraulic systems cover typically up to 160 bar pressure from pump and to motors and actuators 140 bar. Recently, dedicated pumps and accessories running with sea-water as fluid are available. A unique solution is to use reverse osmosis to generate drinking water from sea-water, and furthermore for several off-shore applications.Furthermore, tap water hydraulic components of the Nessie(R) family and examples of measured performance characteristics are presented and the trends in industrial applications and need for future are discussed.
We take the view that mechatronics, as it relates to fluid power, has three levels which we designate as primary, secondary and tertiary. We briefly review the current status of fluid power, hydraulic and pneumatic, and of electronic control of it. We then focus on tertiary-level mechatronic fluid power and the challenges to it being applied successfully.
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