Method for determining tension in a rod
First Claim
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1. A method of determining the tension in an elongated rod, comprising:
- a. transversely impacting the rod;
b. measuring the transverse vibration response of the rod;
c. generating a theoretical transverse vibration response of the rod;
d. comparing the measured and theoretical transverse vibration responses;
e. adjusting the theoretical transverse vibration response to cause the theoretical transverse vibration response to conform with at least a portion of the measured theoretical transverse vibration response, and;
f. determining the tension in the rod based on the adjusted theoretical transverse vibration response.
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Abstract
A method of determining the tension in an elongated rod is described. The method includes impacting the rod and measuring the vibration response of the rod. Further, the method entails generating a theoretical vibration response of the rod based in part at least on the structural properties of the rod. Thereafter, the method entails adjusting the theoretical vibration response to cause the theoretical vibration response to conform with at least a portion of the measured vibration response. Based on the adjusted theoretical vibration response, the tension of the rod is determined.
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Citations
24 Claims
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1. A method of determining the tension in an elongated rod, comprising:
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a. transversely impacting the rod; b. measuring the transverse vibration response of the rod; c. generating a theoretical transverse vibration response of the rod; d. comparing the measured and theoretical transverse vibration responses; e. adjusting the theoretical transverse vibration response to cause the theoretical transverse vibration response to conform with at least a portion of the measured theoretical transverse vibration response, and; f. determining the tension in the rod based on the adjusted theoretical transverse vibration response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of determining the tension in a rod that anchors a movable gate spillway trunnion to a dam, the method comprising:
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a. mounting one or more transverse motion sensors on the rod; b. impacting the rod and recording transverse motion data from the one or more sensors over a period of time; c. analyzing the transverse motion data and producing a measured frequency response of the rod; d. generating a theoretical model of the rod, calculating a theoretical frequency response of the model, and deriving a series of theoretical modal frequencies from the model, and; adjusting a tension parameter in the model such that at least one modal frequency of the model is approximately equal to a resonance frequency in the measured frequency response. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification