Introduction: Prosthetic valve thrombosis is a rare and severe complication of valve replacement, most often encountered with a mechanical prosthesis. The significant morbidity and mortality associated with this condition warrant rapid diagnostic evaluation. Although surgery is the first-line therapy in symptomatic obstructive mechanical valve thrombosis, thrombolytic therapy has been used as a...

This research paper presents the construction design of Hydro-Electric Power Dam Control System using Fuzzy Logic. In this design two input parameters: water level and flow rate and two output parameters: release valve control and drain valve control are used. This proposed system uses a simplified algorithmic design approach with wide range of input and output membership functions. The hardwar...

Possible faults existing in electronic diesel fuel injection control (EDC) systems include rack deformation, solenoid valve failure, and rack-travel sensor malfunction. Among these problems, the solenoid failure is the most likely to occur for in-use diesel engines. This paper focuses on developing the algorithm that can clearly classify the usability of a solenoid valve without disassembling t...

Fuel return valve is an important part of aviation engines. It achieves the cooling of integrated drive generator by regulating the amount of fuel in the oil cooler of integrated drive generator. Fault modeling and simulation of fuel return valve can provide targeted guidance for its maintenance. This paper establishes fuel return valve's mathematical model which includes the flow control valve...

A computational optimization was performed for a direct-injection diesel engine using three-dimensional modeling. Fully transient CFD analyses of different valve profile strategies for the intake and compression strokes were performed to evaluate the effects on both engine performance and in-cylinder flow-field evolution. The turbulence model was used along with the second order linear upwin...

In this paper, the design and testing of a novel valve for intuitive spatial control soft or continuum manipulators are presented. The is based on style hydraulic flapper valve, but with simultaneous three pressure feed points, which can be used to drive antagonistically arranged actuators positioning robots. variable orifices in rotationally symmetric radial pattern allow an inline mounting co...

In the valve opening control of spacecraft, electro-hydraulic servo position-controlled loading is generally adopted. The nonlinear factors and uncertain interference in system will affect accuracy. order to improve tracking accuracy response speed, model dual-channel valve-controlled symmetrical cylinder position was established. A disturbance observer used estimate unmodeled disturbances syst...

Valve and con?ressor manufacturers have o=ten sought a means by which the time required to conduct compressor valve fatigue evaluations could be significantly reduced. Screening new concepts and improvements in design, processing and manufacture in a manner which proper+y simulates the compressor and produces realistic valve failure modes has often been a concern in initiating development activ...

A nonlinear dynamic model for an unconventional, commercially available electrohydraulic flow control servovalve is presented. The valve is a two-stage valve and differs from the conventional servovalve in that it does not require a feedback wire and ball, and the boost stage uses two spools, instead of a single spool, to meter flow into and out of the valve separately. Consequently, the valve ...