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US 10,768,145 B2Granted
Measurement apparatus, attenuation characteristic calculation method, program, and measurement system
AssigneeSeiko Epson Corporation
InventorYoshihiro Kobayashi
Life of this patent
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Abstract
A conversion section converts a change in signal information outputted from a vibration detector provided on a structural body from the change in the function of time into the change in the function of the distance between a moving object that moves on the structural body and the vibration detector. An attenuation characteristic calculation section calculates an attenuation characteristic of the structural body based on the signal information so converted as to represent the change in the function of the distance.
Claims10
A measurement apparatus for measuring abnormalities in a structural body and performing a structural inspection of the structural body, the measurement apparatus comprising:
- conversion circuitry that receives signal information output from a vibration detector and converts a change in the signal information as provided in a first position on the structural body from a change in the function of time into a change in the function of a distance between a moving object that moves on the structural body and the vibration detector, wherein the signal information indicates an attenuation of a vibration acceleration signal generated by the vibration detector caused by an impact of the moving object, and wherein the attenuation corresponds to a decrease in an amplitude of the vibration acceleration signal as a distance between the vibration detector and the moving object increases;
- attenuation characteristic calculation circuitry that calculates an attenuation coefficient of the attenuation of the vibration acceleration signal through the structural body based on the signal information so converted as to represent the change in the function of the distance, wherein the attenuation characteristic calculation circuitry calculates the attenuation coefficient using amplitudes, as measured by the vibration detector, of the vertical acceleration signal as caused by the impact of the moving object in a plurality of second positions different from the first position;
- estimation circuitry that estimates, for the structural inspection of the structural body, an occurrence of an abnormality of the structural body based on the attenuation coefficient;
- and
- output circuitry that outputs the occurrence of abnormality.
2 more elements
An attenuation characteristic calculation method for measuring abnormalities in a structural body and performing a structural inspection of the structural body, the method comprising:
- converting a change in signal information outputted from a vibration detector provided in a first position on the structural body from the change in the function of time into the change in the function of a distance between a moving object that moves on the structural body and the vibration detector, wherein the signal information indicates an attenuation of a vibration acceleration signal generated by the vibration detector caused by an impact of the moving object, and wherein the attenuation corresponds to a decrease in an amplitude of the vibration acceleration signal as a distance between the vibration detector and the moving object increases;
- calculating an attenuation coefficient of the attenuation of the vibration signal through the structural body based on the signal information so converted as to represent the change in the function of the distance, wherein the attenuation coefficient is calculated using amplitudes, as measured by the vibration detector, of the vertical acceleration signal as caused by the impact of the moving object in a plurality of second positions different from the first position;
- estimating, for the structural inspection of the structural body, an occurrence of an abnormality of the structural body based on the attenuation coefficient;
- and
- outputting the occurrence of abnormality.
2 more elements
A program stored on a non-transitory computer readable storage medium that causes a computer to perform, for measuring abnormalities in a structural body and performing a structural inspection of the structural body:
- converting a change in signal information outputted from a vibration detector provided in a first position on the structural body from the change in the function of time into the change in the function of a distance between a moving object that moves on the structural body and the vibration detector, wherein the signal information indicates an attenuation of a vibration acceleration signal generated by the vibration detector caused by an impact of the moving object, and wherein the attenuation corresponds to a decrease in an amplitude of the vibration acceleration signal as a distance between the vibration detector and the moving object increases;
- calculating an attenuation coefficient of the attenuation of the vibration acceleration signal through the structural body based on the signal information so converted as to represent the change in the function of the distance, wherein the attenuation coefficient is calculated using amplitudes, as measured by the vibration detector, of the vertical acceleration signal as caused by the impact of the moving object in a plurality of second positions different from the first position;
- estimating, for the structural inspection of the structural body, an occurrence of an abnormality of the structural body based on the attenuation coefficient;
- and
- outputting the occurrence of abnormality.
2 more elements
A measurement system for measuring abnormalities in a structural body and performing a structural inspection of the structural body, the measurement system comprising:
- a vibration detector provided in a first position on the structural body;
- and
- a measurement apparatus including
- conversion circuitry that converts a change in signal information outputted from the vibration detector from the change in the function of time into the change in the function of a distance between a moving object that moves on the structural body and the vibration detector, wherein the signal information indicates an attenuation of a vibration acceleration signal generated by the vibration detector caused by an impact of the moving object, and wherein the attenuation corresponds to a decrease in an amplitude of the vibration acceleration signal as a distance between the vibration detector and the moving object increases,
- attenuation characteristic calculation circuitry that calculates an attenuation coefficient of the attenuation of the vibration acceleration signal through the structural body based on the signal information so converted as to represent the change in the function of the distance, wherein the attenuation characteristic calculation circuitry calculates the attenuation coefficient using amplitudes, as measured by the vibration detector, of the vertical acceleration signal as caused by the impact of the moving object in a plurality of second positions different from the first position,
- estimation circuitry that estimates, for the structural inspection of the structural body, an occurrence of an abnormality of the structural body based on the attenuation coefficient, and
- output circuitry that outputs the occurrence of abnormality.
4 more elements
Dependencies are inferred from the claim text.