The frictional properties of cartilaginous tissues, such as the hydraulic permeability, the electro-osmotic permeability, the diffusion coefficients of various ions and solutes, and the electrical conductance, are vital data to characterise the extracellular environment in which chondrocytes reside. This paper analyses one-dimensional measurement principles of these coefficients. Particular att...

This paper studies the energy-saving adaptive robust precision motion control of a single-rod hydraulic cylinder through the use of programmable valves. The programmable valves used in this study is a unique combination of five proportional cartridge valves connected in such a way that the meter-in and meter-out flows can be independently controlled by four of the valves as well as a true cross...

This paper studies the electro-hydraulic proportional position control system of a hydraulic rock drilling jumbo. First all, composition is introduced and transfer function components established, mathematical model whole finally obtained through calculation simplification. Then, PID fuzzy strategy were designed by MATLAB software, was built in simulink. Finally, results indicate that controlle...

To compensate for heave motion, which has an adverse impact on the response of a drill-string or a riser, passive and active devices are usually used. Active heave compensators, whose control system is an essential part, allow conducting operations under more extreme weather conditions than passive ones. This paper presents a constructive method to design a nonlinear controller for an active he...

Hydraulic actuators are characterized by their ability to impart large forces at high speeds and are used in many industrial motion systems. In applications where good dynamic performance is important it is common to contain the actuator in a servo loop comprising a feedback transducer and electronic controller. The majority of electronic servo-controllers used in these systems are analogue bas...

The unique concept of the Self-energising Electro-Hydraulic Brake (SEHB) uses the vehicles kinetic energy as independent brake booster by the principle of self-energisation. This paper presents a new approach for controller synthesis of SEHB using the method of input-output linearisation on basis of a complexity reduced model. Once the control design is achieved, the developed controller is ver...