The design of hydraulic systems is founded on deep physical connections. It needs creativity and, at the present time, it cannot be automated. Nevertheless, powerful design support in hydraulics is still possible. This paper presents a new view to the design of hydraulic systems and shows how sophisticated subtasks of the hydraulic design procedure can be tackled. We identify the “model synthes...

This paper presents a force control solution for a throttle-free multi-pressure hydraulic cylinder actuator. A model-based force controller was developed and the position and velocity tracking control was implemented using low-order linear controllers. Special attention was paid to robustness against variations in the load mass, bulk modulus and system delay. Experimental results demonstrated e...

Owing to the potential negative impacts of climatic changes and grand Ethiopian renaissance dam, water scarcity has become an urgent issue. Therefore, Egyptian Ministry Water Resources Irrigation started a national project lining rehabilitation canals, reduce seepage losses for efficient resource management. This study presents new approach assessing three different crack techniques Ismailia ca...

UnChol Choe, YongChol Sin, CholGuk Yun Kim Il Sung University, Pyongyang, Democratic People’s Republic of Korea Abstract In this paper a method to design the electrode protection system using arc current and voltage and pressure inside the hydraulic cylinder of electrode lift device of an 100t ultra high power furnace (UHP furnace) and confident factor(CF) and Lyapnov function, and then we vali...

The paper deals with the problems of kinematic and dynamic modelling, simulation and experimental test of the planar two-link manipulator with the electrohydraulic control. The kinematic model was constructed on the basis of the kinematic relations and the dynamic model by means of bond graphs. On the test stand the dynamic characterisation and identification of the model mechanism was carried ...

According to the problem that displacement of a traditional digital hydraulic cylinder cannot be adjusted in real-time, synchronous control algorithm for double is proposed based on cross-coupling strategy. AMESim simulation dual-cylinder synchronization system shows not only makes track input signal accurately, but also improves robustness and performance.

This paper studies the high performance robust mo tion control of electro-hydraulic servo-systems. The dynamics of hydraulic systems are highly nonlinear and the system may be subjected to non-smooth and discontinuous nonlinearities due to directional change of valve opening, friction, and valve overlap. Aside from the nonlinear nature of hydraulic dynamics, hydraulic servo systems also have la...

The damage of cylinder and equipment due to the pile detaching can be avoided by using the buffer device with large flow, which adopts throttle buffer inside the cylinder combining with the control of the relief valve outside the cylinder. To investigate the thermodynamic characteristics of the cylinder chambers and the law of movement of piston, the accurate mathematic model need to be establi...