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US 12,710,399 B2Granted
Method and apparatus for evaluating soft material properties using nonlinear vibrations
AssigneeWisconsin Alumni Research Foundation
InventorsMelih Eriten, Karthik Yerrapragada, Haocheng Yang
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Abstract
An apparatus for measuring elastic properties of materials excites the material into nonlinear vibration to reveal, in a free and forced vibration signals, information about Young's modulus, internal stress, and material thickness obtained from nonlinear and linear vibration information.
Claims19
An apparatus for measuring elastic properties of a material comprising:
- a stimulating energy source coupled to the material to excite the material into vibration;
- a vibration sensor adapted to provide an electrical signal measuring vibration of the material;
- and
- a controller executing a stored program to control the stimulating energy source and vibration sensor to:
- (a) excite the material with the stimulating energy source into linear and nonlinear vibration;
- (b) cease excitation of the material to measure the linear and nonlinear vibration with the vibration sensor during a free vibration period;
- (c) extract a value of elasticity from the measured linear vibration;
- and
- (d) extract at least one of a thickness of the material and an internal static stress of the material from the measured nonlinear vibration.
6 more elements
An apparatus for measuring elastic properties of a material comprising:
- a stimulating energy source coupled to the material to excite the material into vibration;
- a vibration sensor adapted to provide an electrical signal measuring vibration of the material;
- and
- a controller executing a stored program to control the stimulating energy source and vibration sensor to:
- (a) excite the material with the stimulating energy source into linear and nonlinear vibration;
- (b) cease excitation of the material to measure the linear and nonlinear vibration with the vibration sensor during a free vibration period;
- (c) extract a value of elasticity from the measured linear vibration;
- and
- (d) extract at least one of a thickness of the material and an internal static stress of the material from the measured nonlinear vibration;
- and
- wherein (a) includes an initial operation of identifying a at least one resonant frequency of the material and the controller operates the stimulating energy source to provide a narrowband excitation of the material specific to the identified at least one resonant frequency.
8 more elements
A method of measuring elastic properties of a material employing an apparatus providing:
- a stimulating energy source coupled to the material to excite the material into vibration;
- a vibration sensor adapted to provide an electrical signal measuring vibration of the material;
- and
- a controller executing a stored program to control the stimulating energy source and vibration sensor;
- the method comprising operating the controller to:
- (a) excite the material with the stimulating energy source into linear and nonlinear vibration;
- (b) cease excitation of the material to measure the linear and nonlinear vibration with the vibration sensor during a free vibration period;
- (c) extract a value of Young's modulus from the measured linear vibration;
- and
- (d) extract at least one of a thickness of the material and an internal static stress of the material from the measured nonlinear vibration.
7 more elements
Dependencies are inferred from the claim text.