| 摘要 |
Methods are disclosed wherein the structural health of a civil structure, pressure vessel, or the like is measured by electronic distance measurement (EDM) from a plurality of stable locations to a plurality of cardinal points on the structure in a methodical manner. By measuring the coordinates of the cardinal points, the dynamic and long-term static behavior of the structure provide an indication of the health of the structure. Analyses includes: comparison to a Finite Element Model (FEM); comparison to historical data; and modeling based on linearity, hysteresis, symmetry, creep, damping coefficient, and harmonic analysis. |
| 主权项 |
1. A method for determining structural health of a pressure vessel with steps comprising:
(a) measuring a plurality of cardinal points fixed to said pressure vessel from a plurality of locations, wherein said cardinal points are identified based at least in part on engineering experience and a finite element model as being good indicators of fidelity of the finite element model of said pressure vessel to reality, at least one retroreflector is attached to each of said cardinal points, a plurality of electronic distance measurement instruments are mounted in a stable reference coordinate system, and a central processor coordinates and time synchronizes said measuring by said plurality of electronic distance measure-merit instruments; (b) measuring at least a first range from a first electronic distance measurement instrument to a first cardinal point, a second range from a second electronic distance measurement instrument to said first cardinal point, and a third range from a third electronic distance measurement instrument to said first cardinal point, wherein said first electronic distance measurement instrument is at a first location, said second electronic distance measurement instrument is at a second location, said third electronic distance measurement instrument is at a third location, and wherein said first location, said second location, and said third location are three different locations; (c) storing at least said first, second, and third ranges; (d) computing a first three-dimensional coordinate of said first cardinal point, in said stable reference coordinate system, based at least in part on said first, second, and third ranges; (e) determining at least a first structural health parameter of said pressure vessel based at least in part on said first three-dimensional coordinate, said coordination and synchronization by said central processor, and said finite element model; and (f) storing said first structural health parameter. |
