Method and apparatus for measuring and indicating the unbalance of a rotor
First Claim
1. A circuit arrangement for the digital display of unbalance representing analog input signals derived from a rotor rotating at a given rpm, comprising analog input signal distributor means for receiving said analog input signals, source means of reference signals, control circuit means, signal integrating means and polarity determining circuit means connecting said input signal distributor means to said control circuit means in that order, clock pulse generator means and counter means connected to said control circuit means to determine the duration of each signal integration by said integrating means for deriving digital signals corresponding to said analog input signals, a plurality of memory means, said control circuit means being connected to supply digital values corresponding to said digital signals to said memory means, a corresponding plurality of indicator units, means interconnecting each of said indicator units with a respective memory means, and constant display means connected to said control circuit means and to said indicator units, said constant display means including selector switch means for selecting a number of characteristic constant values to be displayed corresponding to the dimension of an unbalance, wherein said selector switch means provide a selectable switch position for each characteristic value, and wherein said constant display means comprise logic signal combining means connected to said selector switch means for combining the signals received from said selector switch means in accordance with said characteristic constant values, said logic signal combining means being further connected to receive control signals from said control circuit means to determine the storing of combined signals in said logic signal combining means, said logic signal combining means further comprising decoder means for decoding the combined signals, said decoder means being connected to said indicator units for determining the digital display of the unbalance representing signals with their respective units and the decimal point position.
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Abstract
Analog signals representing the unbalance of a rotor in one or more planes extending perpendicularly and across the longitudinal rotational axis of said rotor, are first adapted prior to an analog to digital conversion. The adaptation takes place in response to at least one adaptation value, which is characteristic for the balancing, such as an attenuation, a sensitivity control, an rpm or measuring range selection and the like. The adapted signal is then combined with a reference signal having a frequency corresponding to the rpm of the rotor. The combined signal is subjected to an analog to digital conversion and then digitally displayed. The circuit arrangement for the performance of the signal adaptation, signal combination and signal display includes adaptation circuit means which are responsive to said adaptation value or values. The adaptation circuit means is connected to receive the unbalance information with the correct sign (+ or -). The adaptation circuit means is further connected to digital indicating means to assure the digital display of the originally analog unbalance representing values with their correct dimensions.
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Citations
14 Claims
- 1. A circuit arrangement for the digital display of unbalance representing analog input signals derived from a rotor rotating at a given rpm, comprising analog input signal distributor means for receiving said analog input signals, source means of reference signals, control circuit means, signal integrating means and polarity determining circuit means connecting said input signal distributor means to said control circuit means in that order, clock pulse generator means and counter means connected to said control circuit means to determine the duration of each signal integration by said integrating means for deriving digital signals corresponding to said analog input signals, a plurality of memory means, said control circuit means being connected to supply digital values corresponding to said digital signals to said memory means, a corresponding plurality of indicator units, means interconnecting each of said indicator units with a respective memory means, and constant display means connected to said control circuit means and to said indicator units, said constant display means including selector switch means for selecting a number of characteristic constant values to be displayed corresponding to the dimension of an unbalance, wherein said selector switch means provide a selectable switch position for each characteristic value, and wherein said constant display means comprise logic signal combining means connected to said selector switch means for combining the signals received from said selector switch means in accordance with said characteristic constant values, said logic signal combining means being further connected to receive control signals from said control circuit means to determine the storing of combined signals in said logic signal combining means, said logic signal combining means further comprising decoder means for decoding the combined signals, said decoder means being connected to said indicator units for determining the digital display of the unbalance representing signals with their respective units and the decimal point position.
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14. A measuring system for indicating the unbalance of a rotating body, comprising sensor means for producing signals representing an unbalance, adjustable attenuator means connected to adjust said signals to produce adjusted signals with reference to given dimensions, a source of reference signals of a frequency related to the rotation rate of said rotating body, means logically combining said adjusted signals of said reference signals to produce analog signals related to the location and magnitude of an unbalance of said rotating body means converting said analog signals to digital coded signals, display means connected to display value corresponding to said coded signals, circuit means connected to said adjustable attenuator means for producing further digital signals corresponding to the settings of said attenuator means, and means for applying said further digital signals to said display means for displaying thereon the dimensions of said displayed values responsive to said coded signal.
Specification