Method for estimating and calculating strength of power transmission pole tower material on basis of rough-fuzzy set

Abstract

The invention discloses a method for estimating and calculating the strength of a power transmission pole tower material on the basis of a rough-fuzzy set. The method comprises the following steps of performing reduction on an index set by using a rough set theory; determining evaluation index weight by a method that subjective weight and objective weight are combined; according to an established evaluation order set, comprehensively evaluating and calculating the actual strength of the tower material by using a fuzzy mathematical method. The typical uncertain problem that the factorial validity affecting the strength of the tower material is not clear in an evolutionary process can be solved. The method can provide an important scientific criterion to the safety evaluation of an iron tower structure.

Description

technical field [0001] The invention relates to the field of structural strength evaluation and calculation of transmission poles and towers, and is particularly suitable for the structural safety evaluation of transmission poles and towers operating for a long time in complex natural environments. Background technique [0002] The essence of line structure safety is an evolution process of an uncertain state space, and the state evolution (transition) process is random, in which the characteristic information representing the actual mechanical strength of tower materials is inaccurate, and the validity of the influencing factors is also It is not clear, the definition and extension of the operating state are vague, and the expert knowledge for state evaluation is incomplete, so the evaluation and calculation of the strength of the line tower material is a complex problem of uncertainty. [0003] Fuzzy comprehensive evaluation is based on fuzzy mathematics. Its basic idea is...

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Problems solved by technology

[0004] There are also some shortcomings in fuzzy comprehensive evaluation applied to the strength evaluation of tower materials: First, there are many factors that affect the strength of tower materials, while the traditional fuzzy comprehensive evaluation needs to calculate all evaluation indicators, so the calculation is more complicated, and may be due to various factors Severe distortion or multi-peak phenomenon caused by small weights; secondly, for the determination of index weights, due to the different evaluation criteria of various experts, the final results will also be different, so it is highly subjective

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