An optimization method for the arrangement of measuring points for modal analysis of high-pile wharf

Abstract

The invention discloses a method for optimizing the arrangement of measuring points for modal analysis of a high-pile wharf, comprising the following steps: establishing a finite element model of a high-pile wharf, calculating a theoretical displacement mode shape and a theoretical curvature mode shape; calculating an optimal sample Determine the initial measuring point sample set; use the effective independent method to optimize the initial measuring point sample set to arrange the measuring points; calculate the control points of each order of curvature mode, and arrange the measuring points at each control point. The beneficial effect of the present invention is: utilize the calculation formula of optimal sample interval to obtain the initial sample group of effective independent method, just controlled the minimum of measurement error upper limit on the selection of initial sample point; On the basis of minimizing the upper bound of the measurement error, the linear independence between the modal vectors is guaranteed at the minimum measurement points; the measurement points are arranged at the control points of the theoretical curvature modal curve to ensure the accuracy of the measurement points. The true mode curve characteristics are represented as accurately as possible.

Description

technical field [0001] The invention relates to an optimization method for modal analysis measuring point arrangement of high-pile wharf, in particular to an optimization method for guiding the arrangement of high-pile wharf damage detection measuring points based on dynamic theory through calculation of theoretical modal of finite element model. Background technique [0002] High-pile wharf is one of the main forms of wharf in our country. It plays an important role in my country's water transportation. The load it bears is very complicated, and it is prone to damage during actual use. major hazards. The damage detection method based on dynamic theory is one of the most promising damage detection methods at present, and the damage can be accurately identified by using the curvature mode method. The unsatisfactory arrangement of modal measuring points will interfere with the recognition of the modal. The reasonable arrangement of modal measuring points is the key to the succ...

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Problems solved by technology

[0004] In 2005, Edward Sazonov proposed a calculation method for the optimal sample point arrangement interval based on the curvature modal damage detection method. Under the condition of considering the measurement noise, the method minimizes the upper bound of the measurement error to find the optimal sample point arrangement Interval h 0 , however, the number of measuring points calculated by this method is large, and the calculated measuring points are not necessarily arranged on the curvature modal control points (modal nodes, inflection points, and extreme points), that is, calculated by the optimal sample interval method The measurement points are redundant and cannot best represent the characteristics of the curvature modal curve

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