Fundamentals Of Rotating Machinery Diagnostics Donald E Bently __FULL__
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The new-generation solid-state digital magnetometers are micromachined from silicon, can withstand overinstantaneous temperatures from -420°C to +550°C, and operate in any external magnetic fields.
Testing and inspection of bearings, gears, and shafts has changed dramatically over the past 35 years. New technologies that allow instant, online information to be completely processed and analyzed have made it possible to monitor and predict equipment malfunction before it has a chance to cause major damage. For example, the conventional way to check if a bearing is good is with an oil-filled cup that is placed in the bearing and is monitored with a feeler gauge. The feeler gauge is moved through the bearing and the needle or the indicator moves up or down depending on the load. The “best” feeler gauge reading is when the needle is just between the outside edges of the feeler. When the gauge needle is between the outside edges of the feeler, the bearing is good. With solid-state digital magnetometers, the instantaneous output is the capacity of the bearing to hold the load in place. No movement of the feeler gauge is required. With the new generation of solid-state digital magnetometers, the instantaneous output is the capacity of the bearing to stop motion when the sensor sees a solid sample of the magnetic sine wave. Most solid-state digital magnetometers that can be used in industrial settings are based on the principles of electron spin resonance (ESR). ESR sensors have been used in industry for years, but the technology has been around since the 1940s and has never been used successfully in industrial settings. ESR sensors are sensitive to temperature, have limited sensitivity, and fail to detect low level contamination of static magnetic flux. Solid-state digital magnetometers offer improved performance. They eliminate the need for temperature compensation, and they are not affected by external field or sensing orientation. They are extremely versatile, and they are much more sensitive than ESR sensors, thus making them more valuable. They have the great advantage of being able to operate in any external magnetic field and they are immune to electrical interference. d2c66b5586