with the prolonged use of domestic centrifugal pump, due to erosion, corrosion and an unbalance the sever vibration of the pump are resulted. an erratic sound coming out of pump makes the user uncomfortable. here, tuned vibration absorber (tva) is used as a vibration controlling device. it is designed to reduce the rms velocity below 20% of the circumferential speed, at which the impeller is ba...

We develop heuristics for a problem that models the static balancing of turbine fans: Load point masses at regularly spaced positions on the periphery of a circle so that the residual unbalance about the center | which corresponds to the axis of rotation of the fan | is as small as possible. We prove that our heuristics provide the same worst-case guarantee in terms of residual unbalance as doe...

The two main sources contributing to scroll compressor vibration at running frequency are the residual rotational unbalance in the crank-rotor assembly and the reciprocating force due to the Oldham ring. The intent of this paper is to develop a rigid body model of the compressor vibrating on resilient grommets. This model is a design tool capable of identifying the sensitivity, of the steady-st...

Voltage unbalance is a power quality problem of significant concern at the electricity distribution level. An excessive level of voltage unbalance can have serious impact on mains connected induction motors. The level of the current unbalance that is present is several times that of the level of the voltage unbalance. Such unbalance in the line currents can lead to excessive losses in the stato...

Voltage Unbalance is a common type of power quality problem. Sequence components occur during unbalance in three phase system. For this reason unbalance is assessed with respect to the sequence components present in the system. Voltage unbalance may adversely affect power system components connected to the system. In this paper, for symmetric and asymmetric faults, positive sequence voltage is ...

− This paper shows utility of phasor total unbalance power as a tool to explain working of unbalanced power systems. Conditions under shunt capacitors used to compensate reactive power can deteriorate the efficiency in three-phase four-wire unbalanced at loads power systems are described. Reactive phenomenon is studied using Emanuel ́s positive-sequence fundamental-frequency reactive power, incl...

Voltage and current unbalance problems of power networks due to AC electrified railway systems are studied and their influences such as the voltage unbalance factor and the current negative sequence contribution factor injected to the network are calculated. Several methods can be used for reducing the power quality unbalance problems which have been proposed and the best of them is chosen by c...

Node scheduling scheme of sensor nodes is one of the most important method to solve the energy-constrained wireless sensor networks. Because there are the defects that high computational complexity of exact location information and the energy consumption unbalance of location-unaware in traditional schemes. Aiming at these problems, an optimal sleep scheduling scheme based on balanced energy co...

The most complete definition for the voltage unbalance is using complex voltage unbalance factor (CVUF) that consists of its magnitude and angle. Unfortunately, the definition did not distinguish between undervoltage and overvoltage unbalance conditions. In this paper, the analysis of the motor is performed using the method of symmetrical component and MATLAB software is used to investigate the...