Method and apparatus for testing the uniformity of a rotary body
First Claim
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1. A method of testing the uniformity of a rotary body comprising the steps of:
- rotating said body;
producing, by means of transducers coupled to receive vibrations from the rotary body, an electrical analysis signal having an amplitude which varies as a function of the non-uniformities;
producing a direct current voltage signal which varies in amplitude as a function of the speed of rotation of the rotary body;
multiplying said direct current voltage and analysis signals to produce a further signal;
integrating the said further signal to provide the harmonic Fourier coefficients of the Fourier development series of the analysis signal; and
determining the magnitude and phase position of the non-uniformities from said Fourier coefficients.
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Abstract
A method and apparatus for testing the uniformity of a rotary body whereby an electrical analysis signal is produced by travel measuring or force measuring transducers having an amplitude which varies as a function of the non-uniformities, multiplied by a direct current signal which varies as a function of the speed of rotation of the body to produce a further signal which is then integrated to provide the Fourier coefficients of the Fourier development series of the analysis signal.
27 Citations
13 Claims
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1. A method of testing the uniformity of a rotary body comprising the steps of:
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rotating said body; producing, by means of transducers coupled to receive vibrations from the rotary body, an electrical analysis signal having an amplitude which varies as a function of the non-uniformities; producing a direct current voltage signal which varies in amplitude as a function of the speed of rotation of the rotary body; multiplying said direct current voltage and analysis signals to produce a further signal; integrating the said further signal to provide the harmonic Fourier coefficients of the Fourier development series of the analysis signal; and determining the magnitude and phase position of the non-uniformities from said Fourier coefficients. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for testing the uniformity of a rotary body comprising:
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transducer means for producing an analysis signal having an amplitude proportional to non-uniformities of said rotary body; a tachodynamo for producing a direct current voltage signal proportional to the rotational frequency of the rotary body; and means for forming harmonic Fourier coefficients of the Fourier series of the analysis signal, said means comprising, for each said Fourier coefficient a multiplier and an integrator connected to the output of the respective multiplier, the analysis signal being applied to one input of the multiplier and said direct current voltage signal being applied to the other input of the respective multipliers, whereby the position and magnitude of said non-uniformities are determined from said coefficients. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. An apparatus for testing the uniformity of a rotary body comprising:
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means for rotating said body; transducer means coupled to receive vibrations from the rotary body for producing an electrical analysis signal having an amplitude which varies as a function of the non-uniformities; means for producing a direct current voltage signal which varies in amplitude as a function of the speed of rotation of the rotary body; means for multiplying said direct current voltage and analysis signals to produce a further signal; means for integrating the said further signal to provide the harmonic Fourier coefficients of the Fourier development series of the analysis signal; and means for determining the magnitude and phase position of the non-uniformities from said Fourier coefficients.
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Specification