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All rotating machines or vibrating structures will exhibit resonances. i.e. Maximum amplitudes of velocity or displacement which occur at some characteristic vibration frequency. By using an accelerometer located at the point of the structure to be monitored and a suitable pick-up for the driving frequency, the basic data to derive velocity and displacement amplitudes can be obtained. It is possible to tune to harmonics of the driving frequency and monitor amplitudes thus providing a characteristic signature for the behaviour of the structure.
This family of FYLDE modules form the components for any vibration monitoring system. The main illustration shows a typical system which handles two accelerometers and can be tuned to simultaneously monitor four separate harmonics.
The FE-3051-TF is a frequency controlled tracking bandpass filter with a standard range of 20 Hz to 1 kHz. (lower frequency ranges may be specified if required.) The tracking filter may be connected via the Tracking Ratio Adaptor (FE-3061-TA) to be centered at harmonics of the rotational speed. The filter gives an AC output at unity gain, and also a rectified and filtered DC output at 1 V DC for 1 V AC.
The Tracking Ratio Adaptor satisfies the requirement to tune the system's FE-3051-TF tracking filters to harmonics which may be fractions or multiples of a fundamental frequency. This unit accepts the fundamental frequency input from a tachometer transducer which may be a magnetic pick-up or other transducer type. It provides optical isolation and synthesizes an appropriate harmonic frequency from multiply/division factors set by banks of on board switches.
This module sets the highest frequency of interest for the application. It is a fixed, user specified frequency with the value marked on the front panel. The pass band is unity gain and the frequency response is 6 pole Butterworth which provides very low in band ripple.
This module sets the lowest frequency of interest for the application. It is a fixed, user specified frequency with the value marked on the front panel. The pass band is unity gain and the frequency response is 6 pole Butterworth which provides very low in band ripple. A special dual frequency version is available.
This module may be set to an input range of 10, 20 or 50 pC/g. A precision integrator provides a velocity output in addition to the acceleration output. The acceleration output is scaled at 10 mV RMS / g (peak) and the velocity output is scaled at 2 mV RMS / mm/s (peak). A front panel control allows the module to substitute the system self test signal for the input signal providing through calibration.
The FE-554-IRM incorporates scaling and integrator functions to provide both velocity and displacement outputs in metric units (mm/s and micro m). Systems requiring scaling in imperial units (in/s and mils) may use the alternative FE-554-IRI module.
This module produces a precision sine wave simulating a velocity and displacement signal. This signal is routed directly to the input of the system's charge amplifiers allowing complete system validation and calibration. The signal is also routed to the Tracking Ratio Adaptor(s) allowing stable self test outputs to be generated by the Tracking Filter(s).
This module incorporates the system power supply for all modules in the system. Two indicating meters enable monitoring of N1, N2 and Broad Band signal levels for two channels. The power supply operates from 110V or 230V ac 50/60Hz
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