Abstract In general two basic methods are used for controlling the velocity of a hydraulic cylinder. First by an axial variable-displacement pump for controls flow to the cylinder. This configuration is commonly known as a hydrostatic transmission. Second by proportional valve powered by a constant-pressure source, such as a pressure compensated pump, drives the hydraulic cylinder. In this stud...

In this study, the effects of the volute tongue geometry variation on the head, efficiency, velocity distribution and cavitation structure of a centrifugal pump in the steady flow behavior under off-design conditions have been investigated. Numerical simulation modeling based on the  turbulence model with a hybrid grid is used to simulate the flow within the modeled pump. The flow is simulated ...

Hydraulic systems are widely used in industry due to their small size-to-power ratios and ability produce very large linear force torque. In traditional hydraulic systems, a variable pump driven by an electric motor is often as power source. these the electro-hydraulic source always operates at its rated speed, causing lots of noise low energy consumption, especially no-load light-load conditio...

A study was performed to investigate the effect of using Euler-Lagrange optimization decreasing energy demands for given electro-mechanical systems exploiting electric drives, which are typical industrial and transportation applications e.g. robotic arm control, train movement control etc.

The speed and torque of the hydraulic motor is controlled by controlling the hydraulic valve pump connected to the hydraulic motor. An electro hydraulic valve coupled to a hydraulic motor is a common method of motor speed control in practice where both load pressure and speed change during operation. In this paper, system equations that include, flow and toque loss term has been established by ...

This study focused on the effects of electro-oxidation combined with electro-Fenton process using boron-doped diamond (BDD) electrodes degradation biorefractory food colorant caramel. Aqueous solutions containing Caramel Class IV, III and Acid Orange 7 were comparatively treated by electrochemical advanced oxidation processes, including (EO), (EF) (EO + EF). The experiments performed in a stirr...

Water is an essential element of life. The government of Ethiopia in collaboration with development allies’ attempts to increase pure water supply. Even though the coverage boosted dramatically still there is critical challenges in maximizing equipment’s reliability, improving service quality, maximizing capacity utilization, minimizing life cycle costs of water production mach...

We report a simple yet highly efficient chemical motor that can be controlled with visible light. The motor made from a noble metal and doped silicon acts as a pump, which is driven through a light-activated catalytic reaction process. We show that the actuation is based on electro-osmosis with the electric field generated by chemical reactions at the metal and silicon surfaces, whereas the con...

Flow-through Microfluidic Device for High-efficiency Transfection of Mammalian Cells through Combined Microelectroporation and Sonoporation. (May 2011) Whitney Leigh Longsine, B.S., Texas A&M University Chair of Advisory Committee: Dr. Arum Han In this study we are presenting a proof-of-concept microfluidic device that simultaneously applies the conditions required for microelectroporation and ...