Self-adaptive separation method for physical and chemical relaxation of silicon foam material based on matching pursuit

Abstract

The invention discloses a self-adaptive separation method for physical and chemical relaxation of a silicon foam material based on matching pursuit, which comprises the following steps: unifying relaxation behavior measurement standards of the silicon foam material in a use scene, and converting the residual pre-tightening force of the silicon foam material into a load retention rate for representing the pre-tightening performance of the material in a specified time; pre-analyzing the degradation trend of the load retention rate of the silicon foam material, and preliminarily determining parameter ranges of a physical relaxation model and a chemical relaxation model; establishing relaxation model dictionary libraries which respectively represent a physical relaxation model dictionary library and a chemical relaxation model dictionary library; and separating physical relaxation and chemical relaxation through matching pursuit, and when an iterative relaxation condition is met, obtaining a series of relaxation models and residual signals. Performance differences in different use scenes are ignored, a dictionary database of a series of physical relaxation models and chemical relaxation models is established based on a signal sparse decomposition idea, and self-adaptive separation of physical and chemical relaxation in the performance degradation trend of the silicon foam material is realized by utilizing a matching pursuit algorithm.

Description

technical field [0001] The invention relates to the technical field of silicon foam materials, in particular to a method for adaptive separation of silicon foam material physicochemical relaxation based on matching and tracking. Background technique [0002] Silicone foam material is a viscoelastic damping material formed by foaming silicone rubber. Due to its high temperature resistance, aging resistance and good viscoelastic properties, it is widely used in heat insulation, packaging and other fields. As a typical polymer material, silicon foam material will relax during long-term use, and as the relaxation effect increases, its heat insulation and shock absorption effects will be weakened. Therefore, in view of the stress relaxation effect of silicon foam materials, it is necessary to grasp its stress relaxation law, support material selection at the initial stage of product design and maintenance and replacement during use, and achieve long-term stable operation of the p...

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Problems solved by technology

Since there are many factors affecting the physical and chemical relaxation behavior of silicon foam materials, not only related to its material composition, but also related to sheet thickness, density, compression rate and use environment, it is difficult to use a general model to describe different Relaxed behavior

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