System and method for detecting structural damage
First Claim
1. A system for determining stiffness parameters of a structure, comprising:
- a sensor arranged to measure vibrations of said structure and output vibration information; and
a stiffness parameter unit for receiving said vibration information, determining natural frequency data of said structure, and determining the stiffness parameters of said structure using said natural frequency data, wherein the natural frequency data comprises at least one measured natural frequency;
wherein the stiffness parameter unit is capable of determining the stiffness parameters of said structure when the number of stiffness parameters to be determined is less than or greater than the number of measured natural frequencies.
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Accused Products
Abstract
A system and method for detecting structural damage is provided that utilizes a general order perturbation methodology involving multiple perturbation parameters. The perturbation methodology is used iteratively in conjunction with an optimization method to identify the stiffness parameters of structures using natural frequencies and/or mode shape information. The stiffness parameters are then used to determine the location and extent of damage in a structure. A novel stochastic model is developed to model the random impact series produced manually or to generate a random impact series in a random impact device. The random impact series method or the random impact device can be used to excite a structure and generate vibration information used to obtain the stiffness parameters of the structure. The method or the device can also just be used for modal testing purposes. The random impact device is a high energy, random, and high signal-to-noise ratio system.
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Citations
52 Claims
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1. A system for determining stiffness parameters of a structure, comprising:
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a sensor arranged to measure vibrations of said structure and output vibration information; and a stiffness parameter unit for receiving said vibration information, determining natural frequency data of said structure, and determining the stiffness parameters of said structure using said natural frequency data, wherein the natural frequency data comprises at least one measured natural frequency; wherein the stiffness parameter unit is capable of determining the stiffness parameters of said structure when the number of stiffness parameters to be determined is less than or greater than the number of measured natural frequencies. - View Dependent Claims (2, 3, 4, 5, 6)
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7-16. -16. (canceled)
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17. A system, comprising:
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a structure; a sensor arranged to measure vibrations of said structure and output vibration information; and a stiffness parameter unit for receiving said vibration information, determining natural frequency data of said structure, and determining the stiffness parameters of said structure using said natural frequency data, wherein the natural frequency data comprises at least one measured natural frequency; wherein the stiffness parameter unit is capable of determining the stiffness parameters of said structure when the number of stiffness parameters to be determined is less than or greater than the number of measured natural frequencies. - View Dependent Claims (18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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22. (canceled)
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32-35. -35. (canceled)
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36. A system, comprising:
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a structure; a random impact device for inducing vibrations in said structure by impacting the structure multiple times at a common impact point and at random intervals; a sensor arranged to measure vibrations of said structure and output vibration information; and a stiffness parameter unit for receiving said vibration information, determining natural frequency data of said structure, and determining the stiffness parameters of said structure using said natural frequency data. - View Dependent Claims (37, 38, 39, 40)
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41. A system for determining stiffness parameters of a structure, comprising:
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a sensor arranged to measure vibrations of said structure and output vibration information; and a stiffness parameter unit for receiving said vibration information, determining mode shape information, and determining the stiffness parameters of said structure using said mode shape information. - View Dependent Claims (42, 43, 44, 45, 46)
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47. A system for determining damage information of a structure, comprising:
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a sensor arranged to measure vibrations of said structure and output vibration information; a stiffness parameter unit for receiving said vibration information, determining mode shape information, and determining the stiffness parameters of said structure using said mode shape information; and a damage information processor for receiving said stiffness parameters and outputting damage information.
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48. A system, comprising:
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a structure; a sensor arranged to measure vibrations of said structure and output vibration information; and a stiffness parameter unit for receiving said vibration information, determining mode shape information, and determining the stiffness parameters of said structure using said mode shape information.
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49. A system, comprising:
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a structure; a random impact device for inducing vibrations in said structure; a sensor arranged to measure vibrations of said structure and output vibration information; and a stiffness parameter unit for receiving said vibration information, determining mode shape information, and determining the stiffness parameters of said structure using said mode shape information.
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50. A system for determining damage information of a structure, comprising:
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a sensor arranged to measure vibrations of said structure and output vibration information; a stiffness parameter unit for receiving said vibration information, determining natural frequency data of said structure and mode shape information, and determining the stiffness parameters of said structure using said natural frequency data and said mode shape information; and a damage information processor for receiving said stiffness parameters and outputting damage information.
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51. A system, comprising:
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a structure; a sensor arranged to measure vibrations of said structure and output vibration information; and a stiffness parameter unit for receiving said vibration information, determining natural frequency data of said structure and mode shape information, and determining the stiffness parameters of said structure using said natural frequency data and said mode shape information.
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52. A system, comprising:
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a structure; a random impact device for inducing vibrations in said structure; a sensor arranged to measure vibrations of said structure and output vibration information; and a stiffness parameter unit for receiving said vibration information, determining natural frequency data of said structure and mode shape information, and determining the stiffness parameters of said structure using said natural frequency data and said mode shape information.
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Specification