Online monitoring method for mechanical properties of 3D printing concrete based on neural network

Abstract

The invention discloses an online monitoring method for mechanical properties of 3D printing concrete based on a neural network. The method comprises the following steps: step 1, neural network model training: training the neural network to be mature by taking the mechanical properties of the 3D printing concrete as output values; step 2, model input feature collection: inputting a constant feature value and collecting a change feature value in real time; step 3, monitoring mechanical properties on line: calculating the mechanical properties of the 3D printing concrete printing finished product through a mature neural network model based on the collected feature data; and step 4, monitoring result reaction: evaluating the mechanical property state of the 3D printing concrete printing finished product based on the monitoring result, drawing a mechanical property distribution diagram of the product, formulating an adjustment scheme and realizing man-machine interaction. According to the method, simulation and prediction of the mechanical property distribution of the printed finished product before 3D printing can be achieved, the mechanical property of the concrete 3D printed finished product is monitored and evaluated in the 3D printing process, the mechanical property distribution diagram of the product is drawn, and the method can be used for optimizing a product printing path and guiding use of the product.

Description

technical field [0001] The invention belongs to the technical field of 3D printing concrete, and in particular relates to an online monitoring method for the mechanical properties of 3D printing concrete based on a neural network. Background technique [0002] 3D printing concrete technology is a construction technology that extrudes strips by moving the extrusion head according to the set three-dimensional path, and superimposes the construction of the whole component layer by layer. Since the 3D printing concrete technology is stacked and formed along with the extrusion direction of the nozzle, the construction method, The physical structure of 3D printed concrete is directional, which further makes the mechanical properties, durability and microstructure of 3D printed concrete printed products directional, that is, anisotropic, which brings difficulties to the performance testing of 3D printed concrete. . Ordinary pouring concrete specimens only need to test the mechanic...

AI Technical Summary

Problems solved by technology

Ordinary pouring concrete specimens only need to test the mechanical properties of any one direction, while the mechanical properties of 3D printed concrete are different in three directions in three-dimensional space, so to fully test the mechanical properties of a 3D printed concrete specimen, at least Detect three sets of test pieces, which undoubtedly increases the amount of testing labor

[0003] The anisotropy of 3D printed concrete is affected by the printing material, construction process and construction environment. During a printing process, some of these influencing factors are constant, such as the length and diameter of the fibers in the printing material, the outlet of the printing nozzle Some of the shape and diameter will change with the printing process, such as the time elapsed after the printing material is mixed with water, extrusion pressure, ambient temperature, etc. Due to these complex influencing factors, it is difficult to rely on a specific formula to This relationship is expressed, which makes it difficult to monitor and control the mechanical properties of 3D printed concrete printed products.

Images