CN-121979341-A - Multi-parameter coupling closed-loop control system based on high-temperature and ultra-high-speed airflow scouring

Abstract

The invention relates to the technical field of parameter coupling, in particular to a multi-parameter coupling closed-loop control system based on high-temperature and ultra-high-speed air flow flushing, which comprises a high-temperature and ultra-high-speed air flow generating unit, an executing unit with multi-channel parallel adjusting capability and a control unit. The control unit realizes high-precision control of the temperature and the flow of the air flow through the coordination of multichannel differential speed regulation, track feedforward compensation, partition on-line correction and real-time feedback loops, and dynamically compensates the scouring deviation of the temperature and the surface of the fluid caused by the space position change and the area difference by combining a layered sensing and data fusion mechanism, thereby improving the stability, the response speed and the space consistency of the temperature control and the flow rate control under the complex scouring working condition.

Inventors

• LIU YONGSHENG

Assignees

• 无锡爱迪热工科技有限公司

Dates

Publication Date

20260505

Application Date

20260130

Claims (8)

1. 1. A multi-parameter coupled closed-loop control system based on high-temperature and ultra-high-speed air flow flushing, which is characterized by comprising: the high-temperature ultrahigh-speed airflow generating unit is used for generating high-temperature airflow with controllable temperature and flow, and accelerating the high-temperature airflow through the airflow accelerating structure and then flushing the high-temperature airflow to the surface of the sample; The execution unit is used for adjusting the working parameters of the high-temperature and ultrahigh-speed airflow generation unit and comprises at least two independently controllable adjusting channels to form a parallel multi-channel adjusting structure; The control unit is configured with: The multichannel differential speed adjusting module is used for determining an adjusting mode according to the deviation amplitude of the air flow temperature, only enabling a channel with a higher response speed to carry out quick compensation when the deviation is smaller than a first threshold value, and carrying out cooperative adjustment on the multichannel according to a set weight when the deviation is between the first threshold value and a second threshold value, wherein the energy adjusting channel is mainly used when the deviation is larger than the second threshold value; The track feedforward compensation module is used for pre-calculating the control parameter requirement value corresponding to each discrete point position according to the relative position change track between the airflow accelerating structure and the sample and generating a feedforward control sequence, and pre-fetching and applying the corresponding feedforward control quantity according to the real-time position information when the test is executed; The zoning on-line correction module is used for dividing the air flow coverage area into a plurality of subareas, establishing a mapping relation between the temperatures of the subareas and the control parameters, and updating a mapping correction coefficient according to the deviation between the measured value and the mapping predicted value in the test process; And the real-time feedback loop is used for carrying out closed-loop correction on the residual deviation after feedforward compensation, and the output of the real-time feedback loop is overlapped with the feedforward control quantity to form a final control instruction.
2. 2. The multi-parameter coupled closed-loop control system based on high temperature, ultra-high speed airflow flushing of claim 1, wherein the multi-channel differential speed adjustment module further comprises a weight distribution unit for: Acquiring a current air flow temperature deviation value and a change rate thereof; Determining the current adjusting mode according to the deviation value; in a multi-channel collaborative adjustment mode, adjusting weights of all adjustment channels are dynamically adjusted according to the deviation change rate, wherein the higher the deviation change rate is, the higher the channel weight with higher response speed is; And respectively outputting the control increment after weight distribution to the execution mechanism of each adjusting channel.
3. 3. The multi-parameter coupled closed-loop control system based on high temperature ultra-high speed air flow flushing of claim 1, wherein the track feed-forward compensation module comprises: The track discretization unit is used for discretizing the preset relative position change track according to the set time interval and extracting position coordinates and attitude angle data of each discrete moment; the geometrical relation calculating unit is used for calculating the scouring distance and incidence angle of the airflow outlet relative to the surface of the sample at each discrete moment according to the installation relation between the airflow accelerating structure and the sample; The parameter lookup table unit is used for inquiring control parameter values required by reaching a target temperature under the conditions of each scouring distance and incidence angle according to the pre-calibrated airflow characteristic data to generate a feedforward control sequence table; And the synchronous calling unit is used for carrying out time matching according to the real-time position information when the test is executed, and sending the corresponding feedforward control quantity to the execution unit in advance.
4. 4. The multi-parameter coupled closed-loop control system based on high temperature ultra-high speed air flow flushing of claim 1, wherein the zonal online correction module comprises: The regional division unit is used for dividing the air flow coverage area into a plurality of subareas which are arranged in a matrix according to the space position, and each subarea is provided with an independent temperature monitoring point; The initial calibration unit is used for controlling the temperature acquisition device to sequentially enter each subarea to perform temperature sampling in a test initialization stage, and establishing an initial mapping table of the temperature sampling values of each subarea and the current control parameters; the deviation detection unit is used for extracting the temperature data of each subarea in the test execution stage and comparing the actual measurement peak temperature of each subarea when the subarea is flushed with the mapping predicted value; and the coefficient updating unit is used for updating the correction coefficient in the mapping table of the corresponding subarea according to the deviation proportion when the deviation exceeds the set threshold, and the updated correction coefficient is used for the control output calculation of the subsequent subarea.
5. 5. The multi-parameter coupled closed-loop control system based on high-temperature and ultra-high-speed air flow flushing according to claim 1, wherein the real-time feedback loop adopts an incremental control algorithm, and the system comprises: the deviation calculation unit is used for calculating the deviation between the actual measurement value of the air flow temperature in the current sampling period and the target set value; The increment calculating unit is used for calculating a control increment according to the current deviation, the previous cycle deviation and the previous two cycles deviation; The output superposition unit is used for superposing the control increment and the feedforward control quantity output by the track feedforward compensation module to form a final control instruction which is sent to the execution unit; wherein the incrementally calculated parameter is pre-set based on the response characteristics of the airflow system.
6. 6. The multi-parameter coupled closed-loop control system based on high temperature ultra-high speed air flow flushing of claim 1, further comprising a layered sensing unit comprising: the source end parameter layer is used for collecting the air supply state and the initial temperature of the air flow generation source end; The transmission parameter layer comprises an airflow speed detection device arranged in the area between the airflow accelerating structure and the sample and used for collecting the scouring speed of high-temperature airflow; The effect parameter layer comprises a thermal infrared imager arranged in the test area and is used for collecting temperature distribution data of the flushed surface of the sample; and the sensors at all layers realize unified clock triggering acquisition through a synchronous data acquisition card, and output data of the sensors serve as input of the multichannel differential speed adjusting module and the real-time feedback loop.
7. 7. The multi-parameter coupled closed-loop control system based on high-temperature and ultra-high-speed air flow flushing according to claim 6, further comprising a data fusion unit, wherein the data fusion unit is configured to: performing time stamp alignment on synchronously acquired data of a source end parameter layer, a transmission parameter layer and an effect parameter layer; checking the effectiveness of each layer of data, marking and filtering abnormal data exceeding a physical reasonable range; Calculating a temperature transfer characteristic parameter under the current working condition according to the sample surface temperature distribution data of the effect parameter layer and the initial temperature data of the source end parameter layer; And sending the data after fusion processing to a multi-channel differential speed adjusting module and a zoning on-line correcting module.
8. 8. The multi-parameter coupling closed-loop control system based on high-temperature and ultra-high-speed air flushing as claimed in claim 1, wherein the high-temperature and ultra-high-speed air flow generating unit adopts a compressed air electric heating mode and comprises an air compression unit, an air storage drying unit, a precise pressure regulating valve, a preheater and a main heater which are sequentially communicated, the air flow accelerating structure is a Laval nozzle used for accelerating high-temperature and high-pressure subsonic air flow from the main heater to supersonic speed, and the multi-parameter coupling closed-loop control system further comprises a vacuum back-pressure subsystem used for maintaining a set low-pressure environment in a sample testing area so as to ensure stable formation of the supersonic speed air flow.

Description

Multi-parameter coupling closed-loop control system based on high-temperature and ultra-high-speed airflow scouring Technical Field The invention relates to the technical field of parameter coupling, in particular to a multi-parameter coupling closed-loop control system based on high-temperature and ultra-high-speed air flow flushing. Background In the high-temperature airflow scouring test, the device is commonly used for simulating the thermal-force coupling effect of high-temperature and high-speed airflow on the surface of a material or a structure, and has higher control accuracy requirements on the temperature, flow and scouring gesture of the airflow. However, the existing high-temperature airflow test system mostly adopts a single control channel or a simple closed-loop control mode, mainly depends on source end parameter adjustment, is difficult to simultaneously consider response speed and adjustment stability, and is easy to generate temperature overshoot or control hysteresis under the condition of rapid change or large disturbance of working conditions. In addition, when relative movement or posture change exists between the airflow accelerating structure and the sample, the airflow scouring distance and the incidence angle continuously change, so that a significant deviation exists between the actual heated state of the sample surface and the set target. The prior art generally relies on feedback regulation passively during the test, lacks prospective compensation for system response changes caused by motion trajectories, and has difficulty in maintaining consistency and repeatability of temperature control during dynamic flushing. Meanwhile, the high-temperature air flow has obvious non-uniformity in spatial distribution, the difference of the heated intensities of different scouring areas is larger, the traditional control method is often used for overall adjustment based on single-point or small quantity of temperature measurement data, the real temperature characteristic of a local area is difficult to reflect, calibration parameters are misaligned due to factors such as system aging and environmental change after long-term operation, and the control precision is further reduced. Therefore, a high-temperature airflow scouring control technology which can integrate multisource sensing information, give consideration to feedforward and feedback control and can adaptively adjust different space areas according to different deviation working conditions is needed, so that the defects of the existing system in the aspects of dynamic response capability, space temperature consistency and long-term stability are overcome. Therefore, a multi-parameter coupling closed-loop control system based on high-temperature and ultra-high-speed air flow flushing is provided. Disclosure of Invention The invention aims to provide a multi-parameter coupling closed-loop control system based on high-temperature and ultra-high-speed air flow flushing, which realizes high-precision stable control of the temperature and the flow rate of the high-temperature and high-speed air flow under complex space and dynamic working conditions through multi-channel differential speed adjustment, track feedforward compensation, partition on-line correction and real-time feedback control. In order to achieve the above purpose, the present invention provides the following technical solutions: A multi-parameter coupled closed-loop control system based on high temperature ultra-high speed air flow flushing, comprising: the high-temperature ultrahigh-speed airflow generating unit is used for generating high-temperature airflow with controllable temperature and flow, and accelerating the high-temperature airflow through the airflow accelerating structure and then flushing the high-temperature airflow to the surface of the sample; The execution unit is used for adjusting the working parameters of the high-temperature and ultrahigh-speed airflow generation unit and comprises at least two independently controllable adjusting channels to form a parallel multi-channel adjusting structure; The control unit is configured with: The multichannel differential speed adjusting module is used for determining an adjusting mode according to the deviation amplitude of the air flow temperature, only enabling a channel with a higher response speed to carry out quick compensation when the deviation is smaller than a first threshold value, and carrying out cooperative adjustment on the multichannel according to a set weight when the deviation is between the first threshold value and a second threshold value, wherein the energy adjusting channel is mainly used when the deviation is larger than the second threshold value; The track feedforward compensation module is used for pre-calculating the control parameter requirement value corresponding to each discrete point position according to the relative position change track between the airflow accelerating stru