This study evaluates the energy efficiency of pressure shock damping in a hydraulic lifting and leveling (HLL) module mobile robotic bricklaying system (RBS). The HLL includes servohydraulic actuator (SHA) damper (HSD). proposed adjustable HSD consists accumulator circuit (HAC) proportional valve. frequency characteristics impedance indices were used to evaluate effectiveness damping. dynamic r...

In this study it has been tried, to compare results and convergence rate of sensitivity analysis and conjugate gradient algorithms to reduce fuel consumption and increasing engine performance by optimizing the timing of opening and closing valves in XU7/L3 engine. In this study, considering the strength and accuracy of simulation GT-POWER software in researches on the internal combustion engine...

Abstract Flow resistance characteristic is an important parameter in the design of solenoid valve. It not only affects determination structural parameters valve, but also plays a decisive role selection control method In this paper, flow curve valve obtained based on 3D steady-state CFD simulation.

Stiction is one of the most common problems in the spring-diaphragm type control valves, which are widely used in the process industry. In this paper, a procedure for single curve piecewise fitting stiction detection method and quantifying valve stiction in control loops based on ant colony optimization has been proposed. The single curve piecewise fitting method of detecting valve stiction is ...

Electro-hydraulic proportional control valves are widely applied for motion control in the electro-hydraulic fluid power system. Normally, a sliding spool is used in the proportional control valve to control the flow direction and flow rate passing through the valve, as a result, the meterin and meter-out orifices are mechanically connected [1]. The sliding spool makes the system robust and eas...

It is well known that automatic groups can be characterized using geometric properties of their Cayley graphs. Along the same line of thought, we provide a geometric characterization of automatic monoids. This involves working with a slightly strengthened definition of an automatic monoid which is still a proper generalization of the concept of an automatic group. The two definitions coincide i...

The control valve operates at high operation frequency (up to 1,000 Hz) in the large pressure differences between the inlet and outlet of the valve. The flow and operation characteristics of a high-speed electromagnetic control valve are investigated using a commercial software, CFD-ACE+. It is found that maximum operation frequency of the control valve depends on the applied electromagnetic fo...

Robust Parameter Design (RPD) has been used as the primary technique to reduce process and product variability. The offline choice of appropriate control factor settings allows RPD to ensure that noise factors have a minimum influence on responses. In this article, an alternative methodology of automatic process control is proposed, that is, controllable factors are adjusted online based on inp...

We report the design, fabrication and characterization of micromachined Parylene structures for self-sealing liquid encapsulation applications. Automatic sealing is enabled through the use of an integrated annular-plate stiction valve which greatly reduces device footprint over in-plane configurations. We achieve automatic wafer-level liquid entrapment without using adhesives or processing at e...