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  • Feed-through filter / particulate / process / signal frequency averaging

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Article: 00107102

Feed-through filter / particulate / process / signal frequency averaging

The Multimode Frequency Averaging Filter is the signal processing extension of our well established encoder signal filters. While the signal filters clean-up and ensure the electrical and low-level integrity of the encoder signals, the averaging filters, in addition, process these signals to reproduce them at average input frequency. They process quadrature/encoder or general clock/direction type inputs.

This specialty filter is particularly suited to slow moving production lines where the ideal control variable is average, and not instantaneous, speed. This happens because instantaneous speed varies randomly due to external events and systematically due to the various coupled, but uncontrolled, mechanisms to the plant power train. As such, instantaneous speed cannot be effectively controlled as its measurement is randomly biased and noisy. In contrast, average speed measurement contains only the net effect of these uncontrolled mechanisms and does not allow them to corrupt speed measurement control. Typical applications of the averaging filters are:

Slow pipe extrusion lines, where raw material feeding (and cost!) is a function of the long-averaged extrusion speed.
Reciprocating machinery (such as weaving) speed control, whereby performance, energy and operational costs are optimized by controlling average motion speed
Engine speed monitoring and control, where shaft rotation is anything but smooth, and
Vane/turbine flowmeters, where vane vibration due to turbulent flow corrupts rate or dose measurement.

Specifications

  • Designed for: particulate
  • Type: feed-through
  • Applications: process
  • Other characteristics: signal frequency averaging

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