Energetic autonomy of a hydraulic-based mobile robot requires a power source capable of both hydraulic and electrical power generation. The hydraulic power is used for locomotion and the electric power is used for the control computer, sensors and other peripherals. In addition, the power source must be lightweight and quiet. This study presents several designs of internal combustion engine-bas...

Hybrid transmissions are characterized by their utilization of more than one form of energy storage. They have the potential to help reduce overall fuel consumption and vehicle emissions by providing the possibility of brake energy recuperation and prime mover operation management. Electric hybrids and electric vehicle drives are nowadays ubiquitous, and mechanical energy storage in flywheel ha...

~. Generation of electricity by coal-f~ed power plants produces large quantities of bottom ash and fly ash. New power plants commonly use fluidized bed combustion (FBC) boilers, which create ashes with high neutralization potential (NP). These ashes, due to their alkaline nature, are often used in surface mine reclamation projects to neutralize acidity and reduce hydraulic conductivity of distu...

The security and stability of the pump system have received extensive attention in hydraulic engineering, especially in nuclear system. Transient operations, such as the rapid closure of a valve, a sudden switch over and start procedure of pumps and pump failure will cause sudden flow variation in the pipe system. This phenomenon, known as water hammer, will cause transient effects on the pump....

Hydraulic control valves are widely used in industrial production, agricultural equipment, construction machinery, and other large power equipment for controlling the pressure flow of fluids hydraulic systems. The driving method has a significant impact on response accuracy valves. This paper reviews methods spools from five aspects: solenoid drive, material expansion motor valve another drive....

This study investigated the status of mechanized power and self-propelled rice cultivation machinery in Guilan Province in northern Iran. The raw data was obtained from 2013 statistics of the Agricultural Jihad Organization of Guilan province. Power per unit of area, mechanization level, area per unit of self-propelled machinery, and mechanization requirement were calculated for eastern, wester...

The Karman vortex street is a common flow phenomenon. In hydraulic machinery, it usually located downstream of the guide vanes and runner blades, which reduces performance may also cause fatigue damage to structure. latest research suggested that difference in velocity gradient on each side blade trailing edge have significant impact strength wake vortex. current work aims verify above conclusi...

In general, weak compressibility is one of the properties liquids. That is, in actual operation hydraulic machinery, flow weakly compressible. However, influence often neglected usual numerical simulation, which makes simulation results different from experimental results. Based on Computational Fluid Dynamics (CFD) solver and model test rig, by means mutual verification between experiment, fit...

The operating hourly cost of the machine is a suitable factor to analyze the cost fluctuation certain machinery in a changing environment and to find of economically feasible work concepts for the studied machine system. This paper, which is based on studies carried out in northern forests of IR-Iran, analyzed and compared costs of four skidding and excavation machines used in timber harvesting...