Optimization method for monitoring point arrangement of high-pile wharf modal analysis

Abstract

The invention discloses an optimization method for monitoring point arrangement of high-pile wharf modal analysis. The method comprises the following steps that a finite element model of a high-pile wharf is established, and a theoretical displacement modal shape and a theoretical curvature modal shape are calculated; the optimal sample interval is calculated, and an initial monitoring point sample set is determined; optimization is performed on the initial monitoring point sample set through an effective independence method for monitoring point arrangement; control points of all-order modal curvature are calculated, and monitoring points are arranged at all the control points. The optimization method has the advantages that an initial sample cluster of the effective independence method is acquired through a calculation formula of the optimal sample interval, and therefore upper bound minimization of measuring errors is controlled in selection of initial sample points; the measuring points in the initial sample cluster are screened through the effective independence method, and therefore on the basis that upper bound minimization of the measuring errors is controlled, the linear independence among modal vectors is guaranteed when the measuring points are least; due to the fact that the measuring points are arranged at the control points of a theoretical curvature modal curve, it is guaranteed that the real modal curve characters can be accurately expressed as much 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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