a portable and light pneumatic branch shake system was designed and manufactured in this research for harvesting fruits that can be harvested by shaking branch. required air flow and electric current are provided for operating system from category containing electrical generator and air compressor on wheelbarrows and portable chassis. vibration is equipped by programmable logic controller (plc)...

Abstract The centrifugal compressor is an important machine in the oil and gas industry, so fault prediction of these machines widely discussed literature. Several techniques can should be used compressors: vibration analysis, non-destructive testing techniques, operating parameters, other techniques. But particular cases, tools are inefficient for making a decision regarding combined diagnosis...

This paper presents the interaction between blade vibration and part-span rotating stall in a multi-stage high speed compressor. Unsteady aerodynamic aeroelastic simulations were conducted using URANS CFD. Steady state computations showed short length scale disturbances formed local to tip of front stage rotor. Using full annulus model, these shown coalesce into flow structures around at approx...

Generation of coherent short-wavelength radiation across a plasma column is dramatically improved under traveling-wave excitation (TWE). The latter is optimized when its propagation is close to the speed of light, which implies small-angle target-irradiation. Yet, short-wavelength lasing needs large irradiation angles in order to increase the optical penetration of the pump into the plasma core...

A better understanding of turbulent unsteady flows is a necessary step towards a breakthrough in the design of modern compressors. Owing to high Reynolds numbers and very complex geometry, the flow that develops in such industrial machines is extremely hard to predict. At this time, the most popular method to simulate these flows is still based on a Reynolds-averaged Navier-Stokes approach. How...

Design models of multi- stage, axial flow compressor are developed for gas turbine engines. Axial flow compressor is one of the most important parts of gas turbine units. Therefore, its design and performance prediction are very important. One-dimensional modeling is a simple, fast and accurate method for performance prediction of any type of compressors with different geometries. In this appro...