Current approaches to design flood-sensitive infrastructure typically assume a stationary rainfall distribution and neglect many uncertainties. These assumptions are inconsistent with observations that suggest intensifying extreme precipitation events the uncertainties surrounding projections of coupled natural-human systems. Here we demonstrate safety factor approach designing urban in changin...

Model-based methodologies can assist in addressing the challenging problem of leakage detection and localization water distribution systems. However, this is not trivial due to inherent non-linearities parametric uncertainties. Most importantly, small number available sensor measurements compared system states, inverse for estimating leakages highly under-determined. In work, utilization a prio...

The model-free adaptive controller (MFAC) for continuous rotary electro-hydraulic servo motor was proposed to deal with uncertainties such as friction, leakage and noise. model of system replaced by universal model, the structure control parameter were combined, MFAC designed using input output data realize low speed tracking system. It is proved simulation experiment that effectively improves ...

The concept of a hydraulic axis plays a central role within the design and analysis of hydraulic systems. A hydraulic axis comprises working, control, and supply elements that realize a subfunction of a hydraulic system. Analyzing a system’s functional structure means to identify the hydraulic axes along with their couplings. The paper in hand addresses this problem; it presents concepts and al...

Aiming at the problem of coexistence matching and mismatching uncertainties in electro-hydraulic servo systems, disturbance observers a backstepping sliding mode controller based on generalized super-twisting algorithm (GSTA) are proposed this paper. First, order to compensate for uncertainty controller, two (GSTDOs) constructed effectively reduce discontinuous gain controller. Then, GSTA is in...

1 Abstract The paper presents a hydraulic astable multivibrator system. The system consists of hydraulic resistors, hydraulic capacitors and hydraulic pressure controlled valves. The system is designed, realised and tested. The measured system behaviour agrees well with the model simulations. The free running frequency of the multivibrator is 0.18 Hz and the output pressure swing is 90% of the ...

Hydraulic excavator energy saving is important to relieve source shortage and protect environment. This paper mainly discusses the energy saving for the hybrid hydraulic excavator. By analyzing the excess energy of three hydraulic cylinders in the conventional hydraulic excavator, a new boom potential energy recovery system is proposed. The mathematical models of the main components including b...

We analyze the motion of viscous and incompressible liquids in the annular space of controllable hydraulic resistances with a cylindrical linear slide-valve. This theoretical study focuses on the turbulent and steady-state motion regimes. The hydraulic resistances mentioned above are the most frequent type of hydraulic resistances used in hydraulic actuators and automation systems. To study the...

INTRODUCTION ................................................................................ 882 I. HYRAULIC FRACTURING POSES ENVIRONMENTAL RISKS TO DRINKING WATER SUPPLIES ........................... 885 II. HYDRAULIC FRACTURING REGULATION IN THE UNITED STATES ..................................................................... 887 A. THE SAFE DRINKING WATER ACT AND THE EPA’S TIMID IMPLEMENT...

This paper describes the implementation of a real-time hydraulic model of a water distribution system in Singapore. This on-line system is based on the Integration of real-time hydraulic data with hydraulic computer simulation models and statistical prediction tools. To facilitate this implementation, a network of wireless sensor nodes continuously sample hydraulic data such as pressure and flo...