sures experienced by a pipeline can be either beneficial or detrimental from an operational performance perspective, depending on the amount, the two phase regime of the mixture (whether homogeneous or slug) and the nature and cause of the transient. It is generally held that when free (undissolved) air, or gas, is present in a hydraulic system, it can greatly reduce the surge pressure levels b...

The surface finish between two mating parts in an assembly has significant influence on the mechanical properties such as wear resistance, corrosion resistance, fatigue resistance and stress concentration. The choice of surface finishing operation such as honing and lapping is based on functional requirements of an assembly. As these processes are expensive, the design engineer should be cautio...

This paper deals with a hybrid actuator composed by a piezo part and a hydraulic one and with a cascade PID-PID control structure for camless engine motor applications. The idea is to use the advantages of both, the high precision of the piezo part and the force of the hydraulic one. In fact, piezoelectric actuators (PEAs) are commonly used for precision positionings, despite PEAs present nonli...

The automation and robotics for earth moving machines were introduced to reduce labor cost and increase machines performances , the increment of position accuracy of the excavator bucket obtained by laser and/or automatic control systems meets both objects. Experimental tests and simulations have shown excavating accuracy to be about two centimeters , the excavating accuracy depends on position...

The article develops a mathematical model of the variable flow pump aircraft power supply, designed to simulate operation supply depending on speed sustainer engine, oil temperature, pressure and (removable power). In addition, control algorithm has been developed that provides required quality transient process, which is achieved by installing additional hydraulic resistances between servo pis...

The article discusses various schematic diagrams of a reciprocating internal combustion engine (ICE) and shows their main disadvantages, in particular, low efficiency, which, depending on the type modern ICE, ranges from 0.25 to 0.5. To increase this indicator, search for more advanced ICE schemes continues. For purpose, new diagram free-piston (FPICE) is proposed, which power transferred by hy...

In order to improve the fault alarm effect on power performance of hydraulic hybrid electric vehicles (HEV), this paper proposes a method for vehicle based technology, builds system model, uses technology extract characteristic signals key components, support vector mechanisms build classifier, and obtains results dynamic technology. The show that proposed can real-time diagnosis engine faults ...