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US 4,015,480 AGranted
Balancing method and apparatus
AssigneeCarl Schenck AG
InventorAlfred J. Giers
Life of this patent
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AssigneeCarl Schenck AG
InventorAlfred J. Giers
Estimating the term…
The present balancing method measures instantaneous analog unbalance representing signals and converts these signals into digital signals. The conversion involves multiplying the measured signals with reference values at least three times within each period of a reference signal. Said reference values are sine or cosine values of an oscillation having the same frequency as the unbalance vibration. The sine and cosine reference values are taken at points of time corresponding to the respective multiplication point of time. The products of all individual multiplications are separately summed for sine and cosine values and at least for one period of the reference signal. Thereafter mean values are formed from the two sums. The just mentioned signal processing steps are performed by digital circuits including digital multipliers, digital summing networks, digital mean value formation circuits, as well as a clock signal generator.
A method for determining the unbalance of a rotating body to be balanced and having an unbalance which causes an unbalance oscillation having an unbalance frequency, comprising producing instantaneous, unbalance representing signals, providing a reference signal having a reference period, said reference signal having a frequency equal to said unbalance frequency, producing reference values at least at three points of time during said reference period of the reference signal, said reference values representing or approximating sine and cosine reference values with respect to said reference period at said three points of time, miltiplying in a digital manner said unbalance representing signals with said sine and cosine reference values at said three points of time to produce respective sine and cosine products, separately summing in a digital manner said sine products at least during one period of said reference signal to produce a sine sum, separately summing in a digital manner said cosine products at least during one period of said reference signal to produce a cosine sum, and producing an unbalance indicating signal from said sine and cosine sums by digitally forming means values from said sums.
An apparatus for producing an unbalance representing signal for balancing a rotatable body to be balanced, comprising unbalance signal pick-up means to provide periodic unbalance representing signals, digital multiplier means having inputs and outputs, analog to digital signal converting means operatively interconnecting said pick-up means to said inputs of said multiplier means, digital signal summing means connected to said outputs of said multiplier means, digital mean value formation means connected to the outputs of said signal summing means for providing said unbalance representing signals, means providing reference values having values dependent upon the instantaneous angular displacement of said rotatable body, means applying said reference values to said multiplier means for multiplying said unbalance representing signals with said reference values, and timing means connected to said multiplier means for effecting multiplication therein at least at three predetermined points of time during a period of said unbalance representing signals.
Dependencies are inferred from the claim text.