Device for indicating the vibration level of a vehicle
First Claim
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1. A device for indicating the vibration level of a helicopter including a rotor, in order to produce first and second vibration levels derived from respective first and second acceleration signals, the device comprising:
- first analysis means for resolving said first acceleration signal delivered by one or more sensors measuring vibration directed along the axis of the rotor into a plurality of axial analysis signals, each occupying a respective first identified frequency band;
a first memory having recorded therein a plurality of axial weighting coefficients, each corresponding to one of said first identified frequency bands;
a control circuit summing second powers of said axial analysis signals weighted by said axial weighting coefficients, thereby producing said first vibration level,second analysis means for resolving said second acceleration signal into a plurality of radial analysis signals, each occupying a respective second identified frequency band, said second acceleration signal being delivered by one or more sensors measuring vibration directed perpendicularly to the axis of the rotor;
a second memory recording a plurality of radial weighting coefficients, each corresponding to one of said second identified frequency bands; and
a second control circuit summing second powers of said radial analysis signals weighted by said radial weighting coefficients in order to produce said second vibration level.
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Abstract
A device for indicating at least a first vibration level VIB1 derived from a first acceleration signal γ1 includes:
- first analysis element FT1 for resolving the first acceleration signal γ1 into a plurality of axial analysis signals γ1i each occupying an identified frequency band Bi;
- a first memory RM1 having recorded therein a plurality of axial weighting coefficients KAi, each corresponding to one of the identified frequency bands Bi; and
- a first control circuit CC for summing the pth powers of the axial analysis signals γ1i weighted by the axial weighting coefficients KAi, thereby producing the first vibration level VIB1.
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Citations
14 Claims
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1. A device for indicating the vibration level of a helicopter including a rotor, in order to produce first and second vibration levels derived from respective first and second acceleration signals, the device comprising:
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first analysis means for resolving said first acceleration signal delivered by one or more sensors measuring vibration directed along the axis of the rotor into a plurality of axial analysis signals, each occupying a respective first identified frequency band; a first memory having recorded therein a plurality of axial weighting coefficients, each corresponding to one of said first identified frequency bands; a control circuit summing second powers of said axial analysis signals weighted by said axial weighting coefficients, thereby producing said first vibration level, second analysis means for resolving said second acceleration signal into a plurality of radial analysis signals, each occupying a respective second identified frequency band, said second acceleration signal being delivered by one or more sensors measuring vibration directed perpendicularly to the axis of the rotor; a second memory recording a plurality of radial weighting coefficients, each corresponding to one of said second identified frequency bands; and a second control circuit summing second powers of said radial analysis signals weighted by said radial weighting coefficients in order to produce said second vibration level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A device for indicating vibration levels of a helicopter rotor, comprising:
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one or more first sensors measuring vibration along an axis of the rotor and delivering a first acceleration signal; first analysis menas for performing a discrete Fourier transform on said first acceleration signal and producing a plurality of axial analysis signals giving values of axial acceleration in succesive narrow frequency bands; a first memory storing plural axial weighting coefficients, each corresponding to a respective one of the successive narrow frequency bands; a first control circuit summing second powers of the axial analysis signals weighted by the respective axial weighting coefficients to provide a first vibration level; one or more second sensors measuring vibration perpendicular to the axis of the rotor and dilivering a second acceleration signal; second analysis means for performing a discrete Fourier transform on said second acceleration signal and producing a plurality of radial analysis signals giving values of radial acceleration in the successive narrow frequency bands; a second memory storing plural radial weighting coeffeicients, each corresponding to a respective one of the succesive narrow frequency bands; a second control circuit summing second powers of the radial analysis signals weighted by the respective radial weighting coefficients to provide a second vibration level. - View Dependent Claims (14)
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Specification