Electro-hydraulic servo pump control belongs to an electro-hydraulic coupling motion system, which involves the mutual penetration and integration of mechanical, hydraulic, electrical, control, other disciplines, as well time-varying, uncertain, multisource, multifield problems internal external excitation makes system have characteristics a complex model, strong coupling, nonlinearity, time-va...

The karst hydrological processes are the response of karst groundwater system to precipitation. This study provided a concept model of karst hydrological processes. The hydraulic response time of spring discharge to precipitation includes the time that precipitation penetrates through the vadose zone, and the subsequent groundwater pressure wave propagates to a spring outlet. Due to heterogenei...

COX, ROBERT. H., Determinants of systemic hydraulic power in unawsthetizcd dogs. Am. J. Physiol. 226(3) : 579-587. 1974.-The characteristics of hydraulic power delivery to the systemic circulation by the left ventricle were studied in 16 trained, unanesthetized, chronically instrumented dogs. Measurements of ascending aorta flow, and ascending aorta, left ventricular, and central venous pressur...

The two-phase flow composed of polymetallic nodules and the fluid in hydraulic hoist for deep sea mining was simulated by the discrete particle method (DPM). The motion of nodule particles was simulated by the particle-motion-resolved model, in which the effects of Saffman lift force and Magnus lift force were included. The collisions between particles as well as between particles and the pipe ...

In this document the design, control and simulation of a hydraulic model for grasping an object is presented. The principal equations that constraint such a system are first investigated through the presentation of the hydraulic components which constitute the model. Their intrinsic characteristics are discussed as well as their interactions with each other. The controller that best fit this ap...

A switched inertance hydraulic system uses a fast switching valve to control flow or pressure and is potentially very efficient as it does not rely on dissipation of power by throttling. This article studies its performance using an analytical method which efficiently describes the system in the time domain and frequency domain. A lumped parameter model and a distributed parameter model have be...

[Abstract] An automated E/H steering controller is essential for autonomous off-road equipment. This paper presents a methodology for designing the E/H steering controller through a combination of testing and simulation. The steering kinematic model provides the steering linkage gain between the hydraulic actuator and the front wheel. The model makes it possible to close the steering control lo...

In this paper, we describe the nonlinear outcome of spiral shocks in protoplan-etary disks. Spiral shocks, for most protoplanetary disk conditions, create a loss of vertical force balance in the post-shock region and result in rapid expansion of the gas perpendicular to the disk midplane. This expansion has characteristics similar to hydraulic jumps, which occur in incompressible fluids. We pre...

The effectiveness of a pervious concrete pavement to transport water through it depends on the intrinsic permeability of the system. However, this characteristic is usually defined in terms of the porosity of the material. It has been observed that porosity alone is an inadequate indicator of the permeability of pervious concretes, since the permeability depends on pore sizes, geometry and conn...