Passive systems possess the beneficial properties of ease of human control, and stable interaction with arbitrary passive systems. Motivated by these properties, our research has been directed towards developing passive hydraulic systems. A novel hydraulic element called the passive valve was first developed. The passive valve was used in single degree of freedom passive bilateral teleoperation...

1. Abstract Near real-time continuous monitoring systems have been proposed as a promising approach for helping drinking water utilities detect and respond quickly to threats related to the normal operation of the water network. Water quality sensors may detect contamination events that pose a growing threat to public health, while pressure and flow sensors are used for estimating the hydraulic...

Current methods for determining the influence of xylem cavitation on hydraulic conductance are limited to unbranched stem or root segments with hydraulic conductances above c. 2 mmol s~ MPa . Lower conductances and/or highly branched systems are encountered in seedlings, arid-land shrubs, herbs, and distal portions of shoot and root systems of trees. In order to quantify the hydraulic impact of...

In this paper, we consider the regulation of water level in open-channel hydraulic systems. We consider a LQ control problem for linear symmetric infinitedimensional systems. A state feedback control law is obtained part from the solution of a three-dimensional partial differential Riccati equation. The effectiveness of this control law is demonstrated in simulation when applied to the nonlinea...

This paper studies the high performance robust motion control of electro-hydraulic servo-systems driven by double-rod hydraulic actuators. The dynamics of hydraulic systems are highly non-linear and the system may be subjected to nonsmooth and discontinuous non-linearities due to directional change of valve opening, friction and valve overlap. Aside from the non-linear nature of hydraulic dynam...

Wall-bounded turbulence manifests itself in a broad range of applications, not least in hydraulic systems. Here, we briefly review the significant advances over the past few decades in the fundamental study of wall turbulence over smooth and rough surfaces, with an emphasis on coherent structures and their role at high Reynolds numbers. We attempt to relate these findings to parallel efforts in...

Nowadays, hydraulic actuators play an important role in a modern industry where controlled force or position with high accuracy is the most significant demand. This paper presents a new kind of hydraulic load simulator (HLS) for conducting performance and stability test in the bench system where force control is important. The system model consists of a hybrid hydro-electric actuator and anothe...