Permanent magnet synchronous machines (PMSMs) are widely used in a variety of applications. The static eccentricity the rotor is common fault fabrication process. These faults cause imbalanced electromagnetic force and exert unexpected vibration acoustic noise during design In worst case, it causes bearing or motor failure. This research investigates impact this on temporal spatial harmonic dis...

There is considerable evidence that second-order motion, such as motion consisting of a drifting contrast modulation, is detected separately from first-order motion. Some previous studies have shown that the rate at which sensitivity declines as either drift speed or eccentricity increases is the same for both types of motion. However, these studies have used second-order motion stimuli based o...

Despite the emergence of new types of electric machines, the squirrel-cage induction motor remains the dominant one. A motor failure can result in large lost revenues. One of types of faults that can occur in these motors is airgap eccentricity. This paper presents results, based on a Finite Element Analysis. It is shown that static eccentricity leads to a non-uniform temperature distribution a...

the center (periphery) of a graph is the set of vertices with minimum (maximum)eccentricity. in this paper, the structure of centers and peripheries of some classes ofcomposite graphs are determined. the relations between eccentricity, radius and diameterof such composite graphs are also investigated. as an application we determinethe center and periphery of some chemical graphs such as nanotor...

The second Zagreb coindex is a well-known graph invariant defined as the total degree product of all non-adjacent vertex pairs in a graph. The second Zagreb eccentricity coindex is defined analogously to the second Zagreb coindex by replacing the vertex degrees with the vertex eccentricities. In this paper, we present exact expressions or sharp lower bounds for the second Zagreb eccentricity co...

In the condition monitoring of induction machines operating in various industry sectors, assessment eccentricity is as important windings, bearings, mechanical vibrations or noise. The reasons for can be various; example, rotor imbalance, damage wear improper alignment and load machine finally, assembly errors after overhaul. Disregard this phenomenon during routine tests may result development...

In a clinical setting, emphasis is given to foveal visual function, and tests generally only utilize static stimuli. In this study, we measured static (SVA) and dynamic visual acuity (DVA) in the central and peripheral visual field on healthy, young emmetropic subjects using stationary and drifting Gabor patches. There were no differences between SVA and DVA in the peripheral visual field; howe...