Based on the intrinsic characteristics of power grid and the analysis of power losses,node voltage amplitude and voltage phase,this paper obtains the expression ofΔPloss,ΔQloss,ΔU,Δδ and their relations to wheeling businesses.

It can calculate the power losses of each feeder rapidly and correctly and provide reliable foundation for the analysis and management of the power losses in low voltage distribution network.

By the study of the influence on the voltage to the transformers'power losses,this paper presents the conception of critical voltage spread load rate,which is used to decide the direction of the voltage spread.

The coupling coefficients and power losses of two graded index fibers due to radial offset and angular misalignment are considered as the experimental errors.

2. less voltage and power losses; 3. weakening the disturbance to communication; 4. no longer necessary to lower the bows when the trains are in movement, etc.

With the wall conditioning, impurities and radiation power losses are generally lower than those with boronization, and strong wall pumping and low hydrogen recycling occur in these tokamak discharges.

All flow parameters characterized by one-dimensional flow theory in the turbine stage can be calculated after solving a group of equations by using these static stream pressures and the results of performance testing, taking account of pressure rise due to the velocity slipping at the rotor inlet and by introducing a relation of power losses from the disc friction and windage.

This paper presents the methods for calculathg the lift, output power,input power,ef-ficiency,various partial efficiencies,various power losses and discharge coefficient of thesucker rod pump in the pumping well.

On the other hand,this mechanical simplification also brings lower efficiency(comparing with the stirling,the pulse tube has more heat and power losses)and inconvenience of phase angle adjustment.

The dependence of the power losses on the dislocation velocity is studied.

The difficulties are related to radiation power losses due to imperfect matching in microwave channels and leakage of energy of electrons (acquiring an energy quantum from radiation and transferring it to phonons in the microbolometer absorber.

Optical power losses in a thin-film waveguide on silicon substrate

Running a plasma torch off design power can significantly alter power losses through the nozzle wall and subsequently change the species distribution at the nozzle exit.

An increase in the power losses were found after changes in the electrical configuration of the deposition set-up.

This paper presents the structure of the five tilting pad journal bearings which is designed for an air turbo-compressor (DA930-121). Its specifications, production technology and 1:1 full-size test are discussed. The test rig and the test measurement instruments are also described. In addition, the test results of the vibration of the rotor and bearings, the oil flow rate, temperature and the power loss of the bearings are generally analyzed.

This paper is mainly devoted to: (1) the description of the special features of the equations of pressure, equations of flow and resistance and the calculations of the performances of the journal bearings under turbulent conditions; (2) the comparison between the performances of the elliptic bearings under turbulent conditions and those under laminar conditions. The comparison shows that with the same eccentricity the load capacities for the turbulent operation are larger, the stiffness and damping of the oil...

This paper is mainly devoted to: (1) the description of the special features of the equations of pressure, equations of flow and resistance and the calculations of the performances of the journal bearings under turbulent conditions; (2) the comparison between the performances of the elliptic bearings under turbulent conditions and those under laminar conditions. The comparison shows that with the same eccentricity the load capacities for the turbulent operation are larger, the stiffness and damping of the oil film are greater and stability conditions are basically the same. With the same coefficients of load capacities, the oil flow for the turbulent operation will be a little greater or smaller, the power losses and temperature rises will be about thrice larger and the regions of stability will be slightly narrower. Thus the data for laminar operation may be used to estimate the stability performances for turbulent operation in case of lack of the turbulent data; (3) a comparison among several theories of the turbulent lubrication developed abroad more recently by Constantinescu, Ng and Pan, Aoki and Harada and Hirs. These theories have been examined and analysed. The result shows that the theory put forward by Aoki and Harada is the best of all. On the other hand the Hirs Theory is obviously unreasonable when it is used with large eccentricities; (4) suggestions and recommendations made to the manufacturer concerned: recommending the length diameter ratio should be chosen as 0.75, the elliptic ratios should be chosen between 0.5 and 2/3 and some kinds of grooves for oil outflow should be made in the region of the oil film rupture to reduce power losses; (5) a preliminary disoussion on the rational criteria for determining the flow regime in the oil film of an elliptio bearing. The materials in the paper may prove helpful in designing, calculating and experimenting with bearings for turbulent operation.

In this paper the capillary and orifice-compensated multi-recess hydrostatic journal bearings without circumferential oil groove are studied. Starting with the equation of continuity of flow, through analyzing the characteristics of the bearing with any number of recesses, general formulas for calculating the pressure in each recess, load capacity or stiffness and power loss are derived, to be used in computer operations. The paper shows also the effects of some demensionless design parameters on the characteristics...

In this paper the capillary and orifice-compensated multi-recess hydrostatic journal bearings without circumferential oil groove are studied. Starting with the equation of continuity of flow, through analyzing the characteristics of the bearing with any number of recesses, general formulas for calculating the pressure in each recess, load capacity or stiffness and power loss are derived, to be used in computer operations. The paper shows also the effects of some demensionless design parameters on the characteristics of bearings. With increasing shaft speed of rotation, heat evolution and temperature rise become a critical problem. Consequently, the optimum design with the aid of a computer has been resorted to, under the constraints of maxima load capacity and stiffness for a given recess geometry, with the total power loss as an objective function. In order to solve this problem, the penalty function method is applied to transform a constrained minimization problem into a seguence of unconstrained minimization problems. The optimum solution to the design problem is obtained by using Powell's method. Both the flow chart and the computer program in FORTRAN are worked out in detail.