The fluid flow control systems can be classified depending on the type of pressure source, on the pipe system structure and on the control element. Depending on the pressure source type, the flow control systems can be equipped with centrifugal pumps or volumetric pumps. Concerning the pipe structure, the flow control systems can be used within the hydraulic systems with branches or without bra...

In this paper, a 20-ton prototype compound hybrid excavator is presented which includes assisting electric motor, swing electric motor, a super capacitor pack, an engine and negative flow hydraulic system. The energy-saving principle of hybrid excavator is introduced as well. The development rules of power train which include parameter design rules of key components and hierarchical structure o...

Recently, AIRBUS and ONERA were involved in the ESACS (Enhanced Safety Assessment for Complex Systems) European project. The aim of this project was to investigate new safety assessment techniques based on the use of formal design languages and associated tools. Two case-studies based on AIRBUS aircraft were used to validate the approach. Both a complete hydraulic system and an electric system ...

Sediment erosion not only reduces efficiency and life of hydropower turbines but also causes problems in operation and maintenance. Several factors are responsible for this erosion in hydro turbine components. This paper presents the sediment erosion types in hydraulic turbines and their components based upon an extensive literature review and the field observation at Cahua hydropower plant, Pe...

The active hydraulic mount with solenoid actuator (AHM-SNA) does not require permanent magnets, is of low cost, and has attracted wide attention. This paper focuses on each link the secondary path in AHM-SNA, transfer functions (TFs) were studied one by one, a simple efficient expression for total discussed. First, based mathematical model inertia track decoupling membrane, TF from force to out...

The construction machinery market has required increasingly not only on working capacity but also ride comfort quality, therefore it increasing toward researchers and manufacturers. main objective of this paper proposes evaluates the performance semi-active hydraulic cab mount system (SHCMs) a double-drum vibratory roller in direction enhancing vehicle under different operating conditions. Firs...