Modeling and Optimizing the Composite Prepreg Tape Winding Process Based on Grey Relational Analysis Coupled with BP Neural Network and Bat Algorithm

Abstract

As a significant way to manufacture revolving body composite, the composite prepreg tape winding technology is widely applied to the domain of aerospace motor manufacture. Processing parameters, including heating temperature, tape tension, roller pressure, and winding velocity, have considerable effects on the void content and tensile strength of winding products. This paper was devoted to studying the influence of process parameters on the performances of winding products including both void content and tensile strength and trying to provide the optimal parameters combination for the objectives of lower void content and higher tensile strength. In the experiments, tensile strength and void content were selected as the mechanical property and physical performance of winding products to be tested, respectively. An integrated approach by uniting the Grey relational analysis, backpropagation neural network, and bat algorithm was presented to search the optimal technology parameters for composite tape winding process. Then, the composite tape winding process model was provided by backpropagation neural network utilizing the results of Grey relational analysis. According to the bat algorithm, the optimal parameter combination was heating temperature with 73.8 °C, tape tension with 291.2 N, roller pressure with 1804.1 N, and winding velocity with 9.1 rpm. The value of tensile strength increased from 1215.31 to 1329.62 MPa. Meanwhile, the value of void content decreased from 0.15 to 0.137%. At last, the developed method was verified to be useful for optimizing the composite tape winding process. Graphical Abstract

Electroencephalogram Image under Complex Domain Analysis Algorithm to Analyze Neurological Status Epilepticus and Poor Prognostic Factors of Children

“…Children's neurological epilepsy disease is the damage of brain neurons, leading to abnormal discharge, causing the disease to attack. Status epilepticus (SE) is a common critical illness in neurology and the most severe form of epilepsy [ 3 ], with an annual incidence between 1 in 10,000 and 4 in 10,000 [ 4 ]. It means that epilepsy does not fully recover consciousness and frequently recurs between consecutive episodes [ 5 ], or the episodes last more than 30 minutes and do not stop spontaneously.…”

Influence Mechanism and Optimization Analysis of Technological Parameters for the Composite Prepreg Tape Winding Process

“…Composite prepreg tape winding technology can be defined as a composite fabrication process by which resin-impregnated tapes are consolidated around a rotating mandrel shape with a geometric path and tension to create a structural solid of revolution [7,36]. Figure 1 gives a three-dimensional schematic of the composites prepreg tape winding process.…”

“…During the composite tape winding process, the heating temperature will contribute to reducing the resin viscosity and improving the degree of interlaminar contact and positive force provided by a compaction roller is conducive to squeezing out the bubbles among the interlaminar contact interfaces and enhancing the contact degree of interlayers. In addition, a suitable tape tension can greatly strengthen the hoop tensile strength of tape winding products [ 36 , 37 ].…”

Children’s Neurological Status Epilepticus and Poor Prognostic Factors through Electroencephalogram Image under Composite Domain Analysis Algorithm

“…It is characterized by transient, rigid, paroxysmal, and repetitive central nervous system dysfunction. Its causes are mainly perinatal ischemia and hypoxia, cortical dysplasia, low-grade glioma, encephalitis, trauma, and so on, and it is a relatively common disease of children's nervous system [ 1 ]. Children can show sweating, convulsions, frequent convulsions, and even suffocation during the onset of the disease, which can easily cause loss of consciousness [ 2 ].…”