Results 251 to 260 of about 898,382 (289)

Current limits of PTFE in sliding bearings

IABSE Reports, 2010
<p>The European standard EN 1337 on bridge bearings is supported by experimental studies dating to the ‘70s and the ‘80s, which are not suitable to account for recent issues relevant to operations of steel–PTFE bridge bearings under extreme conditions, like high environment temperatures or high velocities of sliding.
QUAGLINI, VIRGINIO, C. TAVECCHIO, DUBINI, PAOLO, CUMINETTI, DANIELE, FERRONI, DANIELA   +4 more
openaire   +2 more sources

Statistical approach to discharge bearing currents

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2010
PurposeThe purpose of this paper is to propose a statistical approach, which enables the prediction of the risk of the appearance of discharge bearing currents in a given drive that can damage the motor bearings. Using such an approach, the drives for the decisive but expensive, long‐term destructive investigations can be selected.
Robert Smolenski, Adam Kempski, Jacek Bojarski   +2 more
openaire   +1 more source

Analysis of an Eddy Current Journal Bearing

Journal of Tribology, 1988
Nearly all magnetic bearings which have found use in modern technology are based on the attractive force between a magnet and a magnetic material. A distinct disadvantage is that such devices are inherently unstable and require active feedback for operation.
K. A. Connor, J. A. Tichy
openaire   +1 more source

Mineral deposition in current meter bearings

Deep Sea Research and Oceanographic Abstracts, 1975
Abstract Carbonate deposits (siderite, aragonite and calcite) have been identified within current meter bearings. These deposits were observed to inhibit and even prevent the response of sensors mounted on the bearings. The mechanism of precipitation of these minerals is described, with particular reference to the increased reaction rate found when ...
Stephen C. Dexter, John D. Milliman, William J. Schmitz   +2 more
openaire   +1 more source

Bearing currents in wind turbine generators

Journal of Renewable and Sustainable Energy, 2013
Increasing the availability of multi-megawatt wind turbines (WT) is necessary if the cost of energy generated by wind is to be reduced. It has been found that WT generator bearings have a surprisingly high failure rate, with failures happening too early to be due to classical rolling contact fatigue.
M. Whittle, J. Trevelyan, P. J. Tavner
openaire   +1 more source

Current Practice in Journal Bearings

1969
It is advantageous from the production point of view for a manufacturer to use one standard design of journal bearing, made in a small number of standard sizes. The degree of standardization attained is, however, limited by other considerations. The economic benefits of reduction of machine dimensions and of reduction of bearing loss justify the use of
openaire   +1 more source

Research of bearing voltage and bearing current in induction motor drive system

2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC), 2016
To solve bearing electric corrosion of motor drive system, the mechanism of bearing voltage and bearing current is studied. To validate the mechanism, the motor driven by high frequency PWM pulse system is established. The model of drive system based on MATLAB/SIMULINK is introduced.
Zhuxia Fan, Yongjian Zhi, Bingquan Zhu, Guanglin Yan, Yu Shi   +4 more
openaire   +1 more source

Traction Motor Bearing Failures Due to Bearing Currents in Electric Locomotives

2019 IEEE Transportation Electrification Conference and Expo (ITEC), 2019
This paper is concerned with the analysis, measurement and mitigation methods for bearing current related bearing failures in inverter supplied electric locomotive traction motors. The motivation for the study is a record of premature bearing failures observed in AC traction motors in Indian Railways following a transition from GTO converters to IGBT ...
A. Sundaresan, Mukul Chandorkar
openaire   +1 more source

Eddy current sizing of case depth in bearing components

NDT International, 1987
Encircling eddy current coil techniques are being used for the nondestructive evaluation of case depth in bearing components (Figure 1). These techniques, because of their ability to measure only bulk properties in test specimens, lack the necessary spatial resolution to detect local variations in case depth leading to eddy current imaging of the case ...
R. Palanisamy, K. E. Jackson
openaire   +1 more source

The current state of bearing surfaces in total hip replacement

The Bone & Joint Journal, 2014
We reviewed the literature on the currently available choices of bearing surface in total hip replacement (THR). We present a detailed description of the properties of articulating surfaces review the understanding of the advantages and disadvantages of existing bearing couples.
A, Rajpura, D, Kendoff, T N, Board
openaire   +2 more sources