MACHINERY BEARINGS. (INCLUDING APPENDIX).

Condition Monitoring of Rotating Machinery using Active Magnetic Bearings

The concept that changes in the dynamic behaviour of a rotor could be used for general fault detection and monitoring is well established. Current methods rely on the response of the machine to unbalance excitation and are mainly based on pattern recognition approaches. However these methods are relatively insensitive and the crack must be large before it can be robustly detected. Active magnet...

Active Structural Acoustic Source Control of Rotating Machinery Using Piezo Bearings

This work covers the design of active structural acoustic source controllers, where the aim is to reduce radiated noise by placing actuators as close as possible to the disturbance source, in order to intervene as early as possible in the transfer path between disturbance and noise radiators. The considered application is rotating machinery, where the noise is periodic with a fundamental freque...

Magnetic Bearings

Does the Appendix Location Change During Pregnancy?

Background: Early diagnosis of appendicitis is important during pregnancy.  Unlike omentom, cecum and appendix are not likely to be displaced by the growing uterus, so the concept of position change of the appendix during pregnancy is questionable. Objective: To determine the anatomical location of appendix during pregnancy. Methods: In a prospective study from October 1995 to March 1999, 291 w...

Steels for Bearings

A casual metallurgist might be forgiven in believing that there are but a few basic types of steels used in the manufacture of some of the most technologically important engineering components, the rolling bearings. First the famous 1C–1.5Cr steel from which the majority of bearings are made. Its structure is apparently well–understood and the focus is on purity in order to avoid inclusions whi...