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CN-122008461-A - Autoclave multistage cooling control method and system based on flow direction switching

CN122008461ACN 122008461 ACN122008461 ACN 122008461ACN-122008461-A

Abstract

The invention discloses an autoclave multistage cooling control method and system based on flow direction switching, which belong to the technical field of autoclave temperature control, and comprise the steps of obtaining temperature monitoring point data in an autoclave and three-dimensional geometric characteristics of a composite material component, and dividing a plurality of dynamic virtual micro-areas corresponding to heat dissipation parts of the component in the autoclave through a space mapping algorithm; and responding to the instruction set, scheduling a plurality of distributed fluid guiding units with independent corners and opening degrees in the autoclave, and forming a directional cooling flow field for different parts by local pneumatic coupling self-organization. The invention adopts a multistage cooperative control strategy based on flow direction switching and combines dynamic virtual micro-zone division, thereby realizing the fine directional regulation and control of the cooling process of the composite material component in the autoclave.

Inventors

  • ZHANG JINGCUI

Assignees

  • 辽宁北方机械股份有限公司

Dates

Publication Date
20260512
Application Date
20260416

Claims (10)

  1. 1. The autoclave multistage cooling control method based on flow direction switching is characterized by comprising the following steps of: Acquiring real-time temperature data of each monitoring point in the autoclave and three-dimensional model data of the composite material member, and extracting three-dimensional geometric features in the three-dimensional model data; Dividing a plurality of dynamic virtual micro-areas corresponding to the internal space of the autoclave at different heat dissipation positions of the component by a preset space mapping algorithm based on the real-time temperature data and the three-dimensional geometric characteristics; Obtaining the average thermal state distribution of the dynamic virtual micro-area and a target cooling track matched with a technological process, and generating a micro-area regulation instruction set containing regulation priority and heat dissipation demand intensity through comparison operation; And responding to the micro-area regulation instruction set, and scheduling a plurality of distributed fluid guiding units with independent corners and opening degrees in the autoclave to form a directional cooling flow field through local pneumatic coupling self-organization.
  2. 2. The flow-switching-based autoclave multistage cooling control method according to claim 1, wherein the partitioning of the plurality of dynamic virtual micro-zones of the autoclave interior space corresponding to different heat dissipation portions of the member comprises: Identifying a cross-sectional thickness span and a surface curvature change in the three-dimensional geometric feature, and analyzing a physical entity of the composite material component into a plurality of component subareas comprising a thick-wall region, a thin-wall region and a connecting region; According to the space coordinates of the component subareas, searching airflow space nodes in the external normal direction range, establishing a mapping relation between a physical entity and an airflow space, and generating an initial virtual micro-area; acquiring the ratio of the temperature difference value and the thermal conductivity between the adjacent initial virtual micro-regions, and calculating to obtain a cooperative evaluation index reflecting the thermodynamic synchronism between the regions; and comparing the collaborative evaluation index with a preset fusion threshold, and outputting a dynamic virtual micro-region with a boundary dynamically evolving along with the temperature gradient through spatial topology recombination of the adjacent initial virtual micro-regions.
  3. 3. The flow-switching-based autoclave multistage cooling control method according to claim 1, wherein the generating a micro-zone regulation instruction set including a regulation priority and a heat dissipation demand intensity comprises: extracting an expected temperature value corresponding to the current moment in the target cooling track, and calculating a difference value between the real-time average temperature of the dynamic virtual micro-area and the expected temperature value to obtain a first temperature difference parameter; Retrieving the instantaneous temperature extreme values of all monitoring points in the dynamic virtual micro-area to obtain a second temperature difference parameter representing the gradient in the micro-area; acquiring material density and specific heat capacity parameters associated with the three-dimensional geometric features, and carrying out normalization weighting operation by combining the first temperature difference parameters and the second temperature difference parameters to generate comprehensive regulation scores; and distributing corresponding execution sequence fields according to the numerical descending order arrangement result of the comprehensive regulation scores, and converging the execution sequence fields into a micro-region regulation instruction set.
  4. 4. The flow-switching-based autoclave multistage cooling control method according to claim 1, wherein the forming of the directional cooling flow field by local pneumatic coupling self-organization comprises: Receiving the micro-region regulation instruction set, and converting a regulation instruction aiming at a macro region into a flow field subtask aiming at a specific guide node; Issuing the flow field subtask to the corresponding distributed fluid guiding unit, acquiring real-time jet pressure and guide vane attitude angle fed back by the adjacent units, and executing local communication and interference prevention coordination; According to the feedback result of the local communication and interference prevention coordination, the rotation angle of the controllable guide vane and the adjustment quantity of the micro air flow valve in each unit are adjusted; and constructing a directional cooling flow field meeting the radiating directivity requirement by utilizing the converging effect of air jet flow discharged by each distributed fluid guiding unit in the space in the tank.
  5. 5. The flow-switching-based autoclave multistage cooling control method according to claim 1, further comprising, after the self-organizing forms a directional cooling flow field: collecting the current configuration parameters of the directional cooling flow field, obtaining thermophysical parameters reflecting the heat conducting property of the material, and deducing to generate thermal state prediction parameters describing the evolution of the temperature field in the future time period; comparing the local temperature difference predicted value in the thermal state predicted parameter with a gradient safety threshold set in the system, and identifying a target micro-region in which the predicted gradient has an overrun risk; Generating a flow field compensation instruction with preventive property aiming at the target micro-region, inserting the instruction into the micro-region regulation instruction set of the current cycle, and triggering the real-time pre-regulation of the directional cooling flow field.
  6. 6. The flow-switching-based autoclave multistage cooling control method according to claim 5, wherein the generating a preventive-property flow field compensation instruction includes: Analyzing a three-dimensional temperature distribution cloud chart in the thermal state prediction parameters, identifying a grid node group with the temperature higher than an average reference as an overheating subarea, and identifying a grid node group with the temperature lower than the average reference as an underheating subarea; Calculating the geometrical center linear distance and the predicted temperature difference span between the overheat subarea and the underheat subarea, and evaluating an adjustment intensity score required for realizing heat balance; And according to the adjustment intensity score, calculating an execution increment for transferring heat, and driving corresponding distributed fluid guiding units positioned on the heat transfer axes of the overheating subarea and the underheating subarea to execute flow direction bias.
  7. 7. The flow-switching-based autoclave multistage cooling control method according to claim 1, further comprising: in the process of executing the cooling operation, acquiring actual temperature data of each dynamic virtual micro-area in a continuous monitoring period; Calculating the descending amount of the actual temperature data to obtain the actual temperature change rate reflecting the actual heat exchange intensity; comparing the actual temperature change rate with a reference change rate extracted from the target cooling track, and calculating to obtain a rate deviation parameter; And correcting the intensity proportionality coefficient in the micro-region regulation instruction set by using the rate deviation parameter.
  8. 8. The flow-switching-based autoclave multistage cooling control method according to claim 1, further comprising: after the cooling process is started, dividing the cooling process into a first stage for breaking thermal stratification, a second stage for gradient management and control and a third stage for stress release according to the initial temperature field distribution; Setting corresponding staged target temperature ranges and space temperature difference limit values for each stage respectively; And acquiring a state bit signal of the current process at the stage, loading corresponding control strategy weights according to the state bit signal, and driving the cyclic execution under the constraint of different stages.
  9. 9. The method for controlling multi-stage cooling of an autoclave based on flow direction switching according to claim 1, wherein the steps of acquiring real-time temperature data of each monitoring point inside the autoclave and three-dimensional model data of a composite material member, and extracting three-dimensional geometric features in the three-dimensional model data comprise: Acquiring real-time temperature data of global monitoring points in the tank, denoising, interpolating and complementing the acquired data to generate a time-space continuous temperature field data set; performing light topology reconstruction and geometric feature extraction on the composite material member, removing redundant surfaces and invalid control points, and generating three-dimensional geometric features; And carrying out space coordinate system registration on the temperature field data set and the three-dimensional geometric features, and extracting the three-dimensional geometric features of the temperature attribute.
  10. 10. Autoclave multistage cooling control system based on flow direction switching, applied to an autoclave multistage cooling control method based on flow direction switching according to any one of claims 1 to 9, characterized in that it comprises: the data acquisition and three-dimensional geometric feature extraction module is used for acquiring real-time temperature data of each monitoring point in the autoclave and three-dimensional model data of the composite material component, and extracting three-dimensional geometric features in the three-dimensional model data; The dynamic virtual micro-region dividing module is used for dividing a plurality of dynamic virtual micro-regions corresponding to the internal space of the autoclave of different heat dissipation parts of the component through a preset space mapping algorithm based on the real-time temperature data and the three-dimensional geometric characteristics; The regulation and control instruction set generation module is used for acquiring the average thermal state distribution of the dynamic virtual micro-area and a target cooling track matched with the technological process, and generating a micro-area regulation and control instruction set containing regulation and control priority and heat dissipation demand intensity through comparison operation; And the flow direction switching and control executing module is used for responding to the micro-area regulation instruction set, scheduling a plurality of distributed fluid guiding units with independent corners and opening degrees in the autoclave, and forming a directional cooling flow field through local pneumatic coupling self-organization.

Description

Autoclave multistage cooling control method and system based on flow direction switching Technical Field The invention relates to the technical field of autoclave temperature control, in particular to an autoclave multistage cooling control method and system based on flow direction switching. Background The autoclave is used as key equipment for manufacturing high-performance composite material components, and the cooling control stage of the autoclave has important influence on the structural strength and the dimensional stability of the product. By precisely controlling the cooling rate and the space temperature difference, the matrix material can be ensured to shrink uniformly in the glass transition process. With the increasing complexity of the component structure in the aerospace field, the uniformity and response speed of the internal flow field of the autoclave become core indexes for measuring the process level. In the related art, china patent publication No. CN117075661A discloses an autoclave temperature and pressure feedback control system combined with optical fiber monitoring, which comprises an autoclave used for autoclave molding, an optical fiber monitoring system used for acquiring real-time temperature and pressure data of the autoclave, and a main control system used for connecting the autoclave and the optical fiber monitoring system and realizing software control, wherein the main control system comprises an interface subsystem used for displaying the temperature and pressure data of the autoclave in real time, a feedback control algorithm subsystem used for developing the temperature and pressure feedback control algorithm suitable for the autoclave, and a control subsystem used for controlling the temperature and pressure feedback control of the autoclave, wherein the output end of the optical fiber monitoring system is connected to the main control system, the output end of the main control system is connected to a temperature control element and a pressure control element of the autoclave, the input end of the interface subsystem is connected to the autoclave, and the output end of the control subsystem is connected to the autoclave, and the control subsystem is based on the feedback control algorithm of the algorithm subsystem to control the temperature and the pressure of the autoclave to perform autoclave molding. However, the above prior art scheme has the following technical drawbacks. In the prior art, the homogenization control is possibly performed mainly by depending on macroscopic temperature and pressure feedback of the tank body, and the discretization and differentiation cooling flow field regulation and control cannot be performed according to the three-dimensional geometric characteristics and the real-time thermal state of different parts of the composite material component. This tends to result in internal temperature gradients and residual stresses in the complex structure due to uneven heat dissipation during cooling. Traditional autoclave may use a cooling mode of large air volume macroscopic convection, and the air flow path is fixed or rough. The mode is difficult to eliminate a detention area formed by the hot air in the complex structure of the component, and directional cooling of the local overheating part cannot be realized, so that the spatial temperature difference gradient in the cooling process is restrained. The prior art may rely mainly on the current time of day monitoring data for feedback control, belonging to hysteresis regulation. The method lacks the capability of predicting the future temperature field evolution trend by utilizing real-time data, so that the flow field intervention and compensation cannot be actively performed before the local temperature gradient overrun risk occurs, and the accurate gradient control and stress release of the whole process are difficult to realize. Disclosure of Invention In order to solve the problems, the invention provides the autoclave multistage cooling control method and the autoclave multistage cooling control system based on flow direction switching, which adopt a multistage cooperative control strategy based on flow direction switching and combine dynamic virtual micro-zone division to realize the fine directional regulation and control of the cooling process of the composite material component in the autoclave. The above object can be achieved by the following scheme: A multi-stage cooling control method and system for autoclave based on flow direction switching includes obtaining temperature monitoring point data in the autoclave and three-dimensional geometric characteristics of composite material components, dividing a plurality of dynamic virtual micro-areas corresponding to heat dissipation parts of the components in the autoclave through a space mapping algorithm, generating a micro-area regulation instruction set containing regulation priority and heat dissipation demand intensity by compar