Use "Good Vibrations" to Extend System Integrity

著者 Richard Comerford

Electronic Products の提供

The Beach Boys changed the world of rock 'n' roll with a tune called "Good Vibrations." Their success was an early indicator of how the music industry might change over the next decade. "Vibrations" in other industries also give us early warnings – for example, vibration sensing technology can be used to successfully detect and issue early warnings for impending earthquakes.

Similarly, in industrial design, vibrations associated with the constant movement of machine systems can eventually weaken machine components, leading to maintenance issues and equipment failure. But the use of vibration sensing technology can provide essential data to proactively manage machine systems, providing early indicators of potential damage and allowing engineers to make adjustments to avoid costly breakdowns and failures.

Bob Scannell, business development manager for the MEMS/Sensors Technology Group at Analog Devices, recently pointed out, "The motion information provided by such sensors can be invaluable in improving not only performance, but also reliability, safety and cost of ownership."

Vibration sensors for industrial applications can be divided into two basic types: displacement and acceleration. Displacement sensors — typically used for measuring such things as seismic or shaft motion — can detect frequencies up to about 100 Hz and very low amplitude displacements. One example of a displacement sensor – mainly used in earthquake detection – is the D7A-1 vibration sensor from Omron Electronics Inc. The sensor’s built-in switch mechanically opens and closes by vibration. It’s set to be sensitive to vibrations of 90 to 170 cm/s2 (or Gals).

Acceleration sensors can detect much higher frequency vibrations, and are often used to monitor machine "health", safety-shutoff parameters, and can provide vibration analysis and diagnosis.

The ADIS16227, from Analog Devices Inc., is one of the newest accelerometer vibration detectors on the market. It uses three linear micro-electromechanical system (MEMS) accelerometers to measure motion in x, y and z directions. Each accelerometer consists of a miniature fixed frame and a moving frame, which together form a differential capacitance network that responds to linear acceleration in one direction. It can measure vibrations of up to 70 g with a sample rate of 100.2kHz.

This sensor exemplifies another trend: integrated processing capability. The ADIS16227 is effectively a complete vibration-sensing system, with the ability to condition and filter signals, provide alarms and more. Thanks to its programmability, designers can tailor the sensor’s performance to her or his precise needs, with far less effort than before.

By choosing the right vibration sensing technology, companies can design their own "early warning" systems and improve machine performance, reliability, safety and cost of ownership.

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Richard Comerford

Editor Richard Comerford is responsible for Electronic Products magazine’s coverage of lighting and optoelectronics, mechatronics, packaging and enclosures, sensors and transducers, and test and measurement. Comerford is an electrical engineer who has spent more than 30 years writing about electronics for major industry publications and serving as a professional consultant for numerous test and measurement projects.


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