Control method for wind-heat coupling deformation dynamic compensation of large-span flexible sunshade net

Abstract

The present application relates to the technical field of building sunshade control, and relates to a control method for wind-heat coupling deformation dynamic compensation of large-span flexible sunshade net. The method comprises the following steps: obtaining net surface wind pressure, temperature, tension and deformation data, and reference pre-tension and benchmark wind-induced deformation response parameters; determining the current thermal state according to the net surface temperature, determining the current effective pre-tension in combination with the net surface tension, calculating the effective pre-tension retention coefficient, correcting the benchmark wind-induced deformation response parameters according to the effective pre-tension retention coefficient, and obtaining the current wind-induced deformation response parameters; determining the wind-induced pre-regulation amount according to the net surface wind pressure and the current wind-induced deformation response parameters, calculating the target boundary regulation displacement in combination with the net surface deformation deviation, controlling the boundary tension state of the tensioning mechanism, and determining the deformation deviation of the next control cycle according to the regulated net surface deformation. The present application makes the wind-induced deformation compensation match the current net surface tensioning state, reduces the compensation deviation caused by the mismatch of the reference response parameters, and realizes the dynamic compensation of the net surface out-of-plane deformation.

Description

Technical Field

[0001] This invention relates to the field of building shading control technology, and more specifically, to a control method for dynamic compensation of wind-thermal coupling deformation of large-span flexible shading nets. Background Technology

[0002] Building facade shading structures are installed on the outer side of the building envelope to reduce the heat load caused by direct solar radiation on the building's exterior walls or glass curtain walls. Flexible metal shading nets are characterized by their low weight, good light transmission, and adaptability to large-scale building facades. During installation, pretension is typically applied to the net surface through boundary fixing or tensioning mechanisms to maintain the net surface in a predetermined unfolded shape. During outdoor operation, to reduce bulging or displacement of the net surface caused by wind loads, the boundary tensioning mechanism can be adjusted according to the wind conditions to limit the deformation of the net surface.

[0003] However, in applications on building facades facing south or west, where sunlight exposure is prolonged, the temperature of the metal mesh increases and thermal elongation occurs after continuous sunlight exposure. This causes the actual pre-tension state of the mesh to change relative to its installation and commissioning state. When the mesh in this state is subsequently subjected to continuous wind pressure or gusts, the degree of deformation caused by the same wind pressure will also change accordingly because the current pre-tension state of the mesh has changed.

[0004] Existing methods for adjusting the tensioning mechanism based on wind pressure or mesh deformation typically rely on the response relationship between wind pressure and mesh deformation determined during installation and commissioning or under a reference tension state when determining the current wind-induced compensation amount. However, if the tension adjustment amount is still determined based on the response relationship under the reference state after continuous sunlight exposure and a change in pre-tension state, the compensation amount obtained in the current control cycle may not match the actual structural state of the mesh. Correcting the tension only after actual deformation occurs, relying on deformation feedback, will still introduce deviations in the previous compensation. Therefore, a control method for dynamic compensation of wind-thermal coupling deformation of large-span flexible shading nets is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a control method for dynamic compensation of wind-induced deformation of large-span flexible shading nets, so as to solve the problem mentioned in the background art of how to match the response parameters on which wind-induced deformation compensation is based with the current structural state of the net surface when the pre-tension state of the large-span flexible shading net changes, and to dynamically adjust the surface deformation of the net surface accordingly.

[0006] To achieve the above objectives, the present invention aims to provide a control method for dynamic compensation of wind-thermal coupling deformation of large-span flexible shading nets, comprising the following steps: S1. Obtain the mesh surface data corresponding to the target flexible shading net within the current control cycle, as well as the reference pretension of the target flexible shading net under the reference tension state and the reference wind-induced deformation response parameters corresponding to the reference pretension; The mesh data includes mesh wind pressure data, mesh temperature data, mesh tension data, and mesh deformation data; S2. Determine the current thermal state of the target flexible shade net based on the net surface temperature data, and combine the current thermal state with the net surface tension data to determine the current effective pretension characterizing the current net surface tension baseline; S3. Based on the degree of change of the current effective pretension relative to the reference pretension, calculate the effective pretension maintenance coefficient corresponding to the current control cycle; S4. Based on the effective pretension retention coefficient, the reference wind-induced deformation response parameters are corrected to obtain the current wind-induced deformation response parameters that match the current effective pretension. S5. Determine the wind-induced pre-adjustment amount based on the wind pressure data of the mesh surface and the current wind-induced deformation response parameters, and determine the deformation deviation of the target flexible shading net relative to the target deformation range based on the mesh surface deformation data. Calculate the target boundary adjustment displacement based on the wind-induced pre-adjustment amount and the deformation deviation. S6. Control the tensioning mechanism set at the boundary of the target flexible shading net to adjust the boundary tension state of the target flexible shading net according to the target boundary adjustment displacement, and obtain the adjusted net surface deformation data, and determine the deformation deviation corresponding to the next control cycle based on the adjusted net surface deformation data.

[0007] As a further improvement to this technical solution, in step S2, determining the current thermal state of the target flexible shading net based on the mesh surface temperature data involves the following steps: The mesh surface temperature data within the current control cycle is divided into multiple continuous temperature evaluation periods according to the acquisition time, and the corresponding representative mesh surface temperature is determined according to the mesh surface temperature data within each temperature evaluation period. Based on the direction and amount of temperature change of the representative mesh surface between adjacent temperature evaluation periods, the thermal state corresponding to each temperature evaluation period is determined, wherein the thermal state includes a heating state, a temperature stabilization state, and a cooling state. Determine the temperature evaluation period that maintains the same thermal state continuously from the end of the current control cycle, and determine the continuously maintained thermal state as the current thermal state; The time range during which the current thermal state is maintained is defined as the tension evaluation period.

[0008] As a further improvement to this technical solution, in step S2, the current effective pretension is determined by combining the current thermal state and the mesh tension data, involving the following steps: Extract the mesh surface wind pressure data and mesh surface tension data corresponding to each other within the tension evaluation period, and determine the wind pressure change based on the change in the mesh surface wind pressure data between adjacent acquisition times; The continuous time range in which the wind pressure change exceeds the preset wind pressure change threshold is defined as the transient wind pressure disturbance period, and the mesh tension data corresponding to the transient wind pressure disturbance period is determined. Exclude the mesh tension data corresponding to the transient wind pressure disturbance period from the mesh tension data corresponding to the tension evaluation period, statistically analyze the remaining mesh tension data to obtain the current tension baseline value, and determine the current tension baseline value as the current effective pretension.

[0009] As a further improvement to this technical solution, in step S3, calculating the effective pretension retention coefficient involves the following steps: Calculate the pretension difference between the current effective pretension and the reference pretension, and determine the direction of change of the current effective pretension relative to the reference pretension based on the sign of the pretension difference; The ratio between the current effective pretension and the reference pretension is calculated, and the effective pretension retention coefficient is obtained based on the ratio to characterize the degree to which the current tension state of the target flexible shade net is maintained relative to the reference tension state.

[0010] As a further improvement to this technical solution, step S4, determining the reference wind-induced deformation response parameters corresponding to the current control cycle, involves the following steps: The current wind pressure value of the grid surface is determined based on the grid surface wind pressure data within the current control cycle; The current mesh surface wind pressure value is matched with multiple preset continuous wind pressure intervals to determine the target wind pressure interval to which the current mesh surface wind pressure value belongs; Obtain the reference wind-induced deformation response parameters corresponding to each wind pressure range under the reference tension state, and determine the reference wind-induced deformation response parameters corresponding to the target wind pressure range as the reference wind-induced deformation response parameters to be corrected for the current control cycle.

[0011] As a further improvement to this technical solution, in step S4, the correction of the reference wind-induced deformation response parameter to be corrected based on the effective pretension retention coefficient involves the following steps: The correction direction of the reference wind-induced deformation response parameter to be corrected is determined based on the sign of the pretension difference. Specifically, when the pretension difference is less than zero, the direction of increasing the correction of the reference wind-induced deformation response parameter to be corrected is determined; when the pretension difference is greater than zero, the direction of decreasing the correction of the reference wind-induced deformation response parameter to be corrected is determined. The correction amount of the response parameter corresponding to the current tension state of the target flexible shade net is determined based on the effective pretension retention coefficient. When the correction direction is to increase the correction direction, the correction amount of the response parameter is superimposed on the reference wind-induced deformation response parameter to be corrected to obtain the current wind-induced deformation response parameter; When the correction direction is a decreasing correction direction, the correction amount of the response parameter is subtracted from the reference wind-induced deformation response parameter to be corrected to obtain the current wind-induced deformation response parameter.

[0012] As a further improvement to this technical solution, in step S5, determining the wind-induced pre-adjustment amount based on the wind pressure data of the mesh surface and the current wind-induced deformation response parameters involves the following steps: Using the normal direction of the target flexible shade net as the directional reference, the current net surface wind pressure value and the corresponding wind pressure action direction are determined based on the net surface wind pressure data within the current control cycle. The expected surface shape variable under the current wind pressure is determined based on the current surface wind pressure value and the current wind-induced deformation response parameters, and the expected surface shape deformation direction corresponding to the expected surface shape variable is determined based on the wind pressure direction. Based on the predicted surface shape variable, the predicted surface shape deformation direction, and the target deformation range, determine the wind-induced deformation pre-compensation amount corresponding to the current wind pressure. Based on the preset correspondence between the wind-induced deformation pre-compensation amount and the boundary adjustment displacement, the corresponding boundary pre-adjustment displacement and boundary pre-adjustment direction are determined, and the boundary pre-adjustment displacement is assigned a direction value according to the preset boundary adjustment direction reference to obtain the wind-induced pre-adjustment amount.

[0013] As a further improvement to this technical solution, in step S5, the calculation of the target boundary adjustment displacement based on the wind-induced pre-adjustment amount and deformation deviation involves the following steps: The current actual surface shape variable and actual surface shape deformation direction of the target flexible shading net relative to the target deployment position are determined based on the mesh deformation data within the current control cycle. Compare the current actual surface shape variable and actual surface deformation direction with the target deformation range: When the current actual surface deformation exceeds the target deformation range, the deformation deviation is determined based on the amount of deformation exceeding the target deformation range and its direction; when the current actual surface deformation is within the target deformation range, the deformation deviation is determined to be zero. The feedback boundary adjustment displacement and the feedback adjustment direction are determined according to the preset correspondence between the deformation deviation and the boundary adjustment displacement, and the direction of the feedback boundary adjustment displacement is assigned according to the boundary adjustment direction reference to obtain the feedback adjustment amount. The target boundary adjustment displacement is obtained by algebraically superimposing the wind-induced pre-adjustment amount and the feedback adjustment amount according to the boundary adjustment direction reference.

[0014] As a further improvement to this technical solution, step S6, adjusting the boundary tension of the target flexible shading net and determining the deformation deviation corresponding to the next control cycle, involves the following steps: The current boundary adjustment direction is determined based on the sign of the target boundary adjustment displacement and the preset boundary adjustment direction reference, and the magnitude of the current boundary adjustment displacement is determined based on the absolute value of the target boundary adjustment displacement. The tensioning mechanism set at the boundary of the target flexible shade net is controlled to perform boundary adjustment according to the current boundary adjustment direction and the current boundary adjustment displacement, so as to change the boundary tension state of the target flexible shade net; Obtain the mesh deformation data after the end of the current control cycle boundary control, and determine the adjusted actual surface deformation and the actual surface deformation direction based on the mesh deformation data; The adjusted actual surface shape variable and the actual surface deformation direction are compared with the target deformation range to determine the deformation deviation; Specifically, when the adjusted actual surface shape variable is within the target deformation range, the deformation deviation corresponding to the next control cycle is set to zero; When the adjusted actual surface shape variable exceeds the target deformation range, the remaining deformation deviation is determined based on the remaining deformation variable and its direction that exceeds the target deformation range, and the remaining deformation deviation is determined as the deformation deviation corresponding to the next control cycle.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the control method for dynamic compensation of wind-thermal coupling deformation of large-span flexible shading nets, the current thermal state is determined based on the net surface temperature data. After excluding the net surface tension data corresponding to the transient wind pressure disturbance period within the tension evaluation period corresponding to the current thermal state, the current effective pretension is determined. This allows the current effective pretension to characterize the actual tension baseline of the target flexible shading net under the current thermal state, reducing the impact of transient tension changes caused by short-term wind pressure disturbances on the pretension state judgment and solving the problem of difficulty in accurately determining the current pretension state under continuous sunshine conditions.

[0016] 2. In the control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets, the effective pretension retention coefficient is determined based on the change of the current effective pretension relative to the reference pretension, and the reference wind-induced deformation response parameters are corrected accordingly to obtain the current wind-induced deformation response parameters that match the current effective pretension. This allows the response parameters used for wind-induced deformation compensation to be adjusted according to the current tension state of the target flexible shading net, solving the problem that the reference wind-induced deformation response parameters under the reference tension state do not match the current net structure state after the pretension state changes due to continuous sunshine.

[0017] 3. In the control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets, the wind-induced pre-adjustment amount is determined based on the wind pressure data of the net surface and the current wind-induced deformation response parameters. The target boundary adjustment displacement is determined by combining the feedback adjustment amount corresponding to the actual net surface deformation. Then, the deformation adjustment of the next control cycle is carried out based on the remaining deformation deviation after the boundary control ends. This allows the pre-adjustment demand corresponding to the current wind pressure and the actual deformation feedback demand to participate in the boundary tension control together, solving the problem of deviation in the previous compensation caused by feedback correction only after the actual surface deformation occurs. Attached Figure Description

[0018] Figure 1 This is a flowchart of the overall method of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: This example provides a control method for dynamic compensation of wind-thermal coupling deformation of large-span flexible shading nets, applied to the deformation control of flexible metal shading nets installed on building facades. After the target flexible shading net is installed, a corresponding reference tension state is formed, and reference pretension corresponding to the reference tension state and benchmark wind-induced deformation response parameters corresponding to different wind pressure ranges are pre-configured.

[0021] In actual operation, when the target flexible shade net is installed on the west-facing facade of a building or other exterior facades that receive direct solar radiation for a long time, the temperature of the net surface rises after continuous sunlight exposure, causing the metal mesh wires to thermally elongate. This gradually deviates the actual pre-tension state of the net surface from the reference tension state. At this time, when the net surface is subjected to continuous wind pressure or gusts, even if the current wind pressure on the net surface is the same or similar to the wind pressure range corresponding to the reference tension state, the actual deformation of its surface may still differ because the current effective pretension has changed.

[0022] If, under the aforementioned circumstances, the baseline wind-induced deformation response parameters corresponding to the reference tension state are still directly used to determine the boundary adjustment amount, it is easy for the basis of wind-induced deformation compensation in the current control cycle to become mismatched with the current tension state of the mesh. For example, when continuous sunshine causes a decrease in the effective pretension of the mesh, the mesh surface deformation response under the same wind pressure increases. The wind-induced pre-adjustment amount determined using the original baseline wind-induced deformation response parameters may not match the actual deformation response of the current mesh. Relying solely on the actual mesh deformation feedback for subsequent corrections will still result in deviations in the previous compensation.

[0023] Based on this, before determining the wind-induced pre-adjustment amount, this embodiment determines the current effective pre-tension according to the current thermal state of the mesh and the mesh tension data, and determines the effective pre-tension retention coefficient according to the degree of change of the current effective pre-tension relative to the reference pre-tension. Accordingly, the reference wind-induced deformation response parameters are corrected so that the obtained current wind-induced deformation response parameters match the current tension state of the target flexible shade net.

[0024] See Figure 1 As shown in the figure, this embodiment discloses a control method for dynamic compensation of wind-thermal coupling deformation of large-span flexible shading nets, which includes the following steps: S1. Obtain the mesh surface data corresponding to the target flexible shading net within the current control cycle, as well as the reference pretension of the target flexible shading net under the reference tension state and the reference wind-induced deformation response parameters corresponding to the reference pretension; The mesh surface data includes mesh surface wind pressure data, mesh surface temperature data, mesh surface tension data, and mesh surface deformation data.

[0025] Specifically, in this embodiment, the target flexible shade net is installed on the exterior facade of the building, and a tensioning mechanism is provided at its boundary to change the tension state of the net surface boundary. After installation, the target flexible shade net forms a corresponding initial tension state, and the tension state that meets the installation requirements and the net surface is in a stable unfolded state is selected as the reference tension state.

[0026] The wind pressure data of the mesh surface is used to characterize the wind load state acting on the target flexible shading net during the current control cycle; the temperature data of the mesh surface is used to characterize the current thermal state of the target flexible shading net; the tension data of the mesh surface is used to characterize the current tensile state of the target flexible shading net, which includes the current tension baseline of the mesh surface and the tension fluctuations caused by short-term wind load changes; the deformation data of the mesh surface is used to characterize the out-of-plane offset state of the target flexible shading net relative to the target deployment position, and includes the corresponding surface shape variables and surface shape deformation directions.

[0027] The reference pretension is the pretension of the target flexible shade net when it is in the reference tension state, and is used as a benchmark to characterize the degree of change of the current effective pretension relative to the initial tension state. The reference tension state is the tension state when the net tension remains stable after the target flexible shade net is installed, under the condition that the net surface temperature is within the reference temperature range and the net surface is not significantly disturbed by wind load.

[0028] The reference wind-induced deformation response parameter is a parameter used to characterize the relationship between wind pressure on the net surface and the deformation response of the net surface when the target flexible shading net is in the reference tension state. The reference wind-induced deformation response parameter can be set for different wind pressure ranges and serves as a reference parameter for subsequent correction based on the current pre-tension state of the target flexible shading net.

[0029] The wind pressure data, temperature data, tension data, and deformation data acquired within the current control cycle are time-correlated according to their respective acquisition times to ensure that the wind load state, thermal state, tension state, and deformation state remain consistent within the same control cycle. The reference pretension and the baseline wind-induced deformation response parameters are pre-determined reference parameters during the operation control of the target flexible shading net and are directly invoked within the current control cycle.

[0030] S2. Determine the current thermal state of the target flexible shade net based on the net surface temperature data, and combine the current thermal state with the net surface tension data to determine the current effective pretension that characterizes the current net surface tension baseline.

[0031] When a building's facade faces west or is continuously exposed to solar radiation, the temperature of the target flexible shade net does not remain constant after prolonged exposure to sunlight. It may exhibit a continuous increase in temperature with increasing solar radiation, a stable temperature when sunlight conditions are relatively stable, or a decrease in temperature due to weakening solar radiation or cloud cover. The thermal elongation process of the net differs depending on the thermal state. If all net tension data within the current control cycle is directly used as the basis for judging the current pre-tension state, it is easy to mix tension data corresponding to different thermal states. Therefore, this embodiment first determines the current thermal state based on the change in net temperature, and further determines the tension evaluation period continuously corresponding to the current thermal state.

[0032] Specifically, the current control cycle is denoted as The mesh surface temperature data within the current control cycle is divided into categories according to the acquisition time. The first consecutive temperature evaluation period, Each temperature evaluation period is recorded as The temperature evaluation periods are arranged chronologically; for any given temperature evaluation period... The representative mesh surface temperature is determined based on the mesh surface temperature data within that time period. In one embodiment of the present invention, the representative mesh surface temperature The arithmetic mean of the temperature data of each grid surface within the corresponding temperature evaluation period is used to determine the thermal state, so as to reduce the impact of temperature fluctuations at a single sampling moment on the thermal state judgment.

[0033] Furthermore, for two adjacent temperature evaluation periods... and Calculate the change in temperature of the representative mesh surface: ; In the formula, For the first The representative mesh surface temperature change of each temperature evaluation period relative to the previous temperature evaluation period, in degrees Celsius. and These represent the representative mesh temperatures corresponding to two adjacent temperature evaluation periods.

[0034] Specifically, a preset temperature change threshold is set as follows: ; when When the corresponding temperature evaluation period is determined to be in a warming state; when When the temperature is stable, the corresponding temperature evaluation period is defined as the temperature stable state. when At that time, the corresponding temperature evaluation period will be defined as a cooling state.

[0035] The thermal state of the target flexible shading net is composed of the heating state, the temperature stabilization state, and the cooling state.

[0036] It should be noted that the preset temperature change threshold The value of the preset temperature change threshold is determined based on the measurement error of the mesh surface temperature sensor, the temperature sampling fluctuation amplitude, and the temperature change resolution required when the target flexible shading net transitions between different thermal states. Specifically, the preset temperature change threshold ranges from 0.1 to 0.5℃. If the preset temperature change threshold is too small, the temperature sensor measurement error or short-term temperature fluctuation may be misjudged as a heating or cooling state. If the preset temperature change threshold is too large, the actual slow heating or cooling process may be missed. Therefore, in this embodiment, the preset temperature change threshold... The preferred temperature is 0.2℃.

[0037] Furthermore, after determining the thermal state of each temperature evaluation period, the judgment is carried out sequentially in reverse time from the temperature evaluation period corresponding to the end of the current control cycle. The temperature evaluation period that maintains the same thermal state as the end temperature evaluation period and is continuous in time is determined as the temperature evaluation period corresponding to the current thermal state, and the continuous time range corresponding to the current thermal state is determined as the tension evaluation period.

[0038] The current control cycle is determined based on the temperature change response speed of the target flexible shading net, the lag time of the net tension change, and the real-time processing capability of the control system. In this embodiment, the current control cycle ranges from 60 to 300 seconds. If the current control cycle is too short, temperature sampling fluctuations or short-term wind pressure disturbances may have a significant impact on the thermal state judgment. If the current control cycle is too long, it may delay the identification of changes in the thermal state of the net caused by continuous sunlight. Therefore, its preferred value is 120 seconds.

[0039] Within the current control cycle, temperature evaluation periods are divided into intervals of 5 to 30 seconds. The specific interval is determined based on the sampling period of the temperature sensor, the rate of temperature change of the mesh surface, and the required temperature change resolution between adjacent temperature evaluation periods. If the temperature evaluation period is too short, the amount of temperature data in a single period is small, making it susceptible to sampling noise. If the temperature evaluation period is too long, it may reduce the timeliness of identifying the direction of temperature change of the mesh surface. Therefore, in this embodiment, a temperature evaluation period is divided into 6 periods, with each period lasting 20 seconds.

[0040] In this embodiment, if the representative mesh surface temperatures corresponding to the four consecutive temperature evaluation periods near the end of the current control cycle are 38.4℃, 38.7℃, 39.0℃ and 39.3℃ respectively, and the temperature changes of adjacent representative mesh surface temperatures are 0.3℃, 0.3℃ and 0.3℃ respectively, all showing an increase in temperature, and the temperature change between adjacent temperature evaluation periods exceeds the preset temperature change threshold (0.2℃), then the thermal state corresponding to the four consecutive temperature evaluation periods is determined as the current thermal state, i.e., the heating state, and the corresponding continuous 80s time range is taken as the tension evaluation period of this control cycle.

[0041] Furthermore, after determining the tension evaluation period, when the target flexible shading net has already been subjected to external wind, the currently collected net surface tension is not solely formed by the net surface's own pre-tension state, but may also be superimposed with transient tension increments caused by gusts or short-term wind pressure changes. If the instantaneous tension at a certain sampling moment or all tension data within the tension evaluation period is directly used to determine the current pre-tension state, short-term wind-induced tension changes may be mistaken for changes in the tension baseline caused by solar radiation warming, thus affecting the subsequent correction results of the effective pre-tension retention coefficient and wind-induced deformation response parameters.

[0042] Based on this, during the tension evaluation period, the mesh surface wind pressure data and mesh surface tension data corresponding to each other time are extracted; let the mesh surface wind pressure data arranged in chronological order be... Calculate the change in wind pressure between adjacent data collection times: ; In the formula, Indicates the first The change in wind pressure at each sampling time relative to the previous sampling time, in Pa; Indicates the first The wind pressure value on the grid surface at each collection time, in Pa; Indicates the first The wind pressure value on the grid surface at each collection time, in Pa; This indicates the total number of mesh surface wind pressure data collected during the tension evaluation period.

[0043] Specifically, the wind pressure change Compared with the preset wind pressure change threshold When comparing, When the corresponding acquisition time is determined, it is considered to be the time affected by the transient wind pressure disturbance; for multiple acquisition times that are consecutive in time, their corresponding continuous time ranges are merged into a transient wind pressure disturbance period; wherein, a preset wind pressure change threshold is used. The value of the preset wind pressure change threshold is determined based on the normal fluctuation range of the mesh surface wind pressure data under stable wind conditions, the sampling fluctuation of the wind pressure data, and the wind pressure change range that can cause significant transient changes in mesh surface tension. This ensures that the preset wind pressure change threshold is higher than the normal wind pressure fluctuation range between adjacent data collection times under stable wind conditions, thus enabling the identification of wind pressure changes corresponding to gusts or short-term wind pressure surges. If the preset wind pressure change threshold is set too low, normal wind pressure fluctuations under stable wind conditions are easily identified as transient wind pressure disturbances, causing many normal mesh surface tension data to be excluded. If the preset wind pressure change threshold is set too high, it may be impossible to identify short-term wind pressure disturbances that can cause transient changes in mesh surface tension, preventing the corresponding transient tension data from participating in the determination of the current tension baseline value. Therefore, in this embodiment, the preset wind pressure change threshold... The value range is set to 20–80 Pa, and preferably 35 Pa.

[0044] Furthermore, based on the acquisition times corresponding to the mesh surface wind pressure data and the mesh surface tension data, the start and end times of each transient wind pressure disturbance period are obtained. The mesh surface tension data acquired between the start and end times are determined as the mesh surface tension data within the corresponding transient wind pressure disturbance period. The mesh surface tension data within each transient wind pressure disturbance period are excluded from the mesh surface tension data corresponding to the tension evaluation period to obtain the remaining mesh surface tension data.

[0045] Specifically, for the remaining mesh tension data, the current tension baseline value is calculated according to the following formula: ; In the formula, This indicates the current tension baseline value, in kN. The first one retained after eliminating transient wind pressure disturbances The mesh tension value is expressed in kN. This indicates the sequence number of the retained mesh tension data, with a value ranging from 1 to... ; The number of mesh tension data to be retained.

[0046] Furthermore, the current tension baseline value The current effective pretension of the target flexible shade net under the current thermal state is determined.

[0047] It should be noted that if 160 sets of net surface wind pressure data and net surface tension data are obtained within the aforementioned 80-second tension evaluation period, and a preset wind pressure change threshold is set... If the Pa is set to 35, and the acquisition time corresponding to 18 sets of data is found to be within the transient wind pressure disturbance period, then the net surface tension data corresponding to the 18 sets of acquisition time are excluded, and the average value of the remaining 142 sets of net surface tension data is calculated; when the obtained average tension is 8.72kN, 8.72kN is determined as the current effective pretension corresponding to the current control cycle.

[0048] In this embodiment, the current effective pretension is not directly taken as the instantaneous mesh tension at a certain acquisition moment, but is obtained from the remaining mesh tension data after excluding the mesh tension data corresponding to the transient wind pressure disturbance period within the tension evaluation period corresponding to the current thermal state. It is used to characterize the mesh tension baseline of the target flexible shading net under the current thermal state.

[0049] S3. Based on the degree of change of the current effective pretension relative to the reference pretension, calculate the effective pretension maintenance coefficient corresponding to the current control cycle.

[0050] It should be noted that the current effective pretension (i.e., the current tension baseline value) of the target flexible shading net, obtained after excluding the net tension data corresponding to transient wind pressure disturbances, characterizes the current tension baseline. However, due to the influence of mesh size, installation tension and boundary constraints on different target flexible shade nets, the absolute value of their reference pretension varies; even for the same target flexible shade net, the absolute value of the current effective pretension alone cannot directly reflect the direction and degree of change of the current tension state relative to the installation reference state.

[0051] Therefore, in this embodiment, the current effective pretension is compared with the reference pretension to establish a correspondence between the current tension state and the reference tension state; specifically, the current effective pretension obtained in step S2 is denoted as... The reference pretension corresponding to the target flexible shade net being in the reference tension state in step S1 is denoted as . ,in, The pretension difference between the current effective pretension and the reference pretension is calculated as follows: ; In the formula, This represents the pretension difference, in kN. The current effective pretension is expressed in kN. The reference pretension is expressed in kN.

[0052] According to the pretension difference The sign of the value determines the direction of change of the current effective pretension relative to the reference pretension: when When the current effective pretension is lower than the reference pretension, it means that the current tension of the target flexible shade net has decreased relative to the reference tension. when When this occurs, it indicates that the current effective pretension is higher than the reference pretension, meaning that the current tension state has increased in tension relative to the reference tension state. when When this occurs, it indicates that the current effective pretension is consistent with the reference pretension.

[0053] Furthermore, to eliminate the influence of different absolute values ​​of reference pretension on the comparison of tension states for flexible shade nets targeting different targets, the current effective pretension is normalized relative to the reference pretension, and the effective pretension retention coefficient is calculated. : ; In the formula, The effective pretension retention coefficient is a dimensionless parameter.

[0054] It should be noted that the effective pretension retention coefficient It is used to characterize the degree of relative maintenance of the current effective pretension relative to the reference pretension. The degree of change of its value reflects the degree of relative change of the current effective pretension relative to the reference pretension, and is used to determine the degree of correction of the reference wind-induced deformation response parameters.

[0055] Furthermore, the pretension difference Used to determine the direction of change of the current pretension state relative to the reference pretension state; specifically, the pretension difference. The sign of the value is used to determine the correction direction of the reference wind-induced deformation response parameter.

[0056] S4. Based on the effective pretension retention coefficient, the reference wind-induced deformation response parameters are corrected to obtain the current wind-induced deformation response parameters that match the current effective pretension.

[0057] Because the surface deformation response of the target flexible shade net differs under different wind pressure levels under the reference tension state, the benchmark wind-induced deformation response parameters obtained in step S1 can be set separately according to different wind pressure ranges. Specifically, after continuous sunlight exposure, the pretension difference determined in step S3 may indicate that the current effective pretension has deviated from the reference pretension. If the benchmark wind-induced deformation response parameters corresponding to the reference tension state are still directly used to determine the wind-induced pre-adjustment amount, these parameters cannot accurately reflect the surface deformation response under the current tension state. For example, when the current effective pretension decreases, the net tension decreases, and the surface deformation response under the same wind pressure increases relative to the reference tension state.

[0058] Therefore, in this embodiment, the reference wind-induced deformation response parameters to be corrected for the current control cycle are first determined based on the current wind pressure on the mesh surface, and then corrected based on the pretension change direction and effective pretension retention coefficient obtained in step S3.

[0059] Specifically, the current wind pressure value of the flexible shading net is determined based on the wind pressure data within the current control period. This current wind pressure value characterizes the representative wind pressure effect on the target flexible shading net within the current control period. In this embodiment, the arithmetic mean of the absolute values ​​of the wind pressure data within the current control period is calculated, and the resulting average wind pressure is determined as the current wind pressure value of the flexible shading net. The unit is Pa; Furthermore, suppose the current control cycle includes wind pressure value of individual mesh surface The current wind pressure value on the grid surface for: ; In the formula, This is the current wind pressure value on the grid surface, in Pa. For the first time in the current control cycle The wind pressure value on the grid surface at each collection time, in Pa; This indicates the number of grid surface wind pressure data points used in the calculation during the current control cycle.

[0060] The reference wind-induced deformation response parameter is used to characterize the degree of out-of-plane displacement of the net surface corresponding to the change in wind pressure per unit net surface within the corresponding wind pressure range when the target flexible shade net is in a reference tension state, with the unit being mm / Pa; for different wind pressure effects, the preset control wind pressure range is divided into multiple consecutive wind pressure ranges, and reference wind-induced deformation response parameters are set for each wind pressure range.

[0061] Specifically, in this embodiment, the preset control wind pressure range is 0 to 500 Pa, and is divided into four continuous wind pressure intervals: 0 to 100 Pa, 100 to 200 Pa, 200 to 300 Pa, and 300 to 500 Pa. Furthermore, the reference wind-induced deformation response parameters for the above four wind pressure ranges are respectively set at 0.060 mm / Pa, 0.052 mm / Pa, 0.045 mm / Pa, and 0.04 mm / Pa.

[0062] It should be noted that the wind pressure range and the corresponding reference wind-induced deformation response parameters are determined based on the net surface dimensions, reference pretension, boundary constraint state, and installation and commissioning data or historical stable operation data of the target flexible shade net, and are pre-saved as reference control parameters corresponding to the reference tension state.

[0063] Furthermore, the current wind pressure value on the mesh surface... Matching with each of the aforementioned wind pressure ranges, the wind pressure range containing the current grid surface wind pressure value is determined as the target wind pressure range, and the reference wind-induced deformation response parameter corresponding to the target wind pressure range is determined as the reference wind-induced deformation response parameter to be corrected for the current control cycle. .

[0064] Specifically, let the current wind pressure value be... When the pressure is 185 Pa, the current wind pressure value on the mesh surface is determined to be within the wind pressure range of 100–200 Pa. The corresponding value of 0.052 mm / Pa is then obtained and determined as the reference wind-induced deformation response parameter to be corrected for the current control cycle. .

[0065] Furthermore, the reference wind-induced deformation response parameters to be corrected are determined. Then, based on the pretension difference value obtained in step S3 Determine the reference wind-induced deformation response parameters to be corrected. The direction of correction.

[0066] Specifically, within the normal tension range of the target flexible shade net: When the pretension difference At the same wind pressure, the surface deformation response of the mesh increases relative to the reference tension state. Therefore, the wind-induced deformation response parameters to be corrected are... The correction direction is determined to be the direction of increasing correction; When the pretension difference At the same wind pressure, the surface deformation response of the mesh decreases relative to the reference tension state. Therefore, the reference wind-induced deformation response parameters to be corrected are... The correction direction is determined to be the direction of decreasing correction; When the pretension difference At that time, it is not necessary to modify the reference wind-induced deformation response parameters to be corrected. The tension state is corrected, and the reference wind-induced deformation response parameter to be corrected is directly determined as the current wind-induced deformation response parameter.

[0067] In this embodiment, for cases where the current effective pretension is inconsistent with the reference pretension, the effective pretension retention coefficient obtained in step S3 is further used. Determine the target correction ratio.

[0068] Specifically, based on the degree of change of the current effective pretension relative to the reference pretension, the effective pretension maintenance coefficient is set. The system is divided into multiple continuous holding coefficient intervals, and a corresponding response parameter correction ratio is configured for each holding coefficient interval. The greater the change in the current effective pretension relative to the reference pretension, the greater the corresponding response parameter correction ratio. Taking the case where the current effective pretension is lower than the reference pretension as an example: When the effective pretension retention coefficient When the value is between 0.95 and 1.00, the corresponding response parameter correction ratio is set to 5%; when the effective pretension retention coefficient... When the value is between 0.90 and 0.95, the corresponding response parameter correction ratio is set to 10%; when the effective pretension retention coefficient... When the value is between 0.80 and 0.90, the corresponding response parameter correction ratio is set to 15%; when the effective pretension retention coefficient... When the value is between 0.70 and 0.80, the corresponding response parameter correction ratio is set to 25%.

[0069] Furthermore, if the current effective pretension is higher than the reference pretension, the corresponding holding coefficient range and response parameter correction ratio are set according to the degree of increase of the current effective pretension relative to the reference pretension, and the greater the degree of increase of the current effective pretension relative to the reference pretension, the greater the corresponding reduction correction ratio.

[0070] The retention coefficient range and its corresponding response parameter correction ratio can be determined based on the degree of deformation of the target flexible shading net surface under different tension states, and are pre-configured as control parameters. The correspondence between the retention coefficient range and the response parameter correction ratio is used to convert the effective pretension retention coefficient obtained in step S3 into a response parameter that can directly act on the wind-induced deformation response parameter to be corrected. The degree of correction.

[0071] Maintain the current effective pretension coefficient Match the parameters with each of the aforementioned hold coefficient intervals, and determine the correction ratio of the response parameter corresponding to the hold coefficient interval to which it belongs as the target correction ratio for the current control cycle. ; Specifically, based on the aforementioned reference wind-induced deformation response parameters to be corrected... and the target correction ratio The response parameter correction amount is calculated. : ; in, The response parameter correction amount is expressed in mm / Pa, where the response parameter correction amount is... The range by which the reference wind-induced deformation response parameter to be corrected needs to be adjusted after the current tension state of the target flexible shade net changes relative to the reference tension state. The reference wind-induced deformation response parameters to be corrected for the current control cycle are in mm / Pa. The target correction ratio is denoted as , which is a dimensionless parameter.

[0072] Furthermore, when the pretension difference obtained in step S3 At that time, the correction amount of the response parameter is superimposed on the reference wind-induced deformation response parameter to be corrected in the direction of increasing correction. ,get: ; When the pretension difference obtained in step S3 At that time, the wind-induced deformation response parameters of the reference to be corrected are adjusted according to the direction of reduction. After subtracting the correction amount for the response parameters, we get: ; in, These are the current wind-induced deformation response parameters, in mm / Pa; It should be noted that the current wind-induced deformation response parameters This parameter is used to characterize the degree of out-of-plane displacement of the target flexible shade net under the tension state corresponding to the change in wind pressure per unit area of ​​the net surface, with the unit being mm / Pa. The larger the current wind-induced deformation response parameter, the greater the out-of-plane deformation of the target flexible shade net under the same wind pressure change conditions.

[0073] S5. Determine the wind-induced pre-adjustment amount based on the wind pressure data of the mesh surface and the current wind-induced deformation response parameters, and determine the deformation deviation of the target flexible shading net relative to the target deformation range based on the mesh surface deformation data. Calculate the target boundary adjustment displacement based on the wind-induced pre-adjustment amount and the deformation deviation.

[0074] Specifically, the normal of the target flexible shade net is used as the reference for the direction of surface deformation. A direction along the normal of the net is defined as the first out-of-plane direction, and a direction opposite to the first out-of-plane direction is defined as the second out-of-plane direction.

[0075] The current wind pressure value and the corresponding wind pressure direction are determined based on the wind pressure data of the mesh surface during the current control cycle; wherein, the current wind pressure value is used to characterize the degree of wind pressure acting on the target flexible shading net during the current control cycle, and the wind pressure direction is used to characterize the direction of the current wind pressure relative to the normal of the mesh surface.

[0076] Furthermore, based on the current mesh surface wind pressure value... and the current wind-induced deformation response parameters Determine the expected surface shape variables under the current wind pressure. : ; In the formula, The expected surface shape variable is used to characterize the expected out-of-plane offset of the target flexible shade net under the current tension and wind pressure conditions, in mm.

[0077] Furthermore, the expected surface shape change direction corresponding to the expected surface shape variable is determined according to the direction of the wind pressure action. When the current wind pressure action corresponds to a first out-of-plane direction, the expected surface shape change direction is determined to be the first out-of-plane direction; when the current wind pressure action corresponds to a second out-of-plane direction, the expected surface shape change direction is determined to be the second out-of-plane direction. In this embodiment, a target deformation range is set for the target flexible shade net. The target deformation range is used to limit the out-of-plane offset range that the target flexible shade net is allowed to have relative to the target unfolded position in its normal unfolded state.

[0078] Specifically, with the surface shape deformation corresponding to the target unfolding position set to zero, in this embodiment, the first out-of-plane direction and the second out-of-plane direction each adopt the same allowable surface shape deformation limit value. The target deformation range is ,in, The allowable surface deformation limit is given in mm.

[0079] It should be noted that the allowable surface deformation limit is... The value range is 3 to 15 mm, and the allowable surface deformation limit is... The allowable out-of-plane offset is set according to the span of the target flexible shade net, the boundary installation space, and the allowable out-of-plane offset under normal unfolding state. When the allowable out-of-plane offset limit is too small, the slight out-of-plane offset caused by normal wind pressure fluctuations can easily trigger boundary adjustment frequently. When the allowable out-of-plane offset limit is too large, it can easily cause a large out-of-plane offset of the net to persist. Based on this, in this embodiment, it is preferred to set it to 5mm.

[0080] In this embodiment, the wind-induced deformation pre-compensation amount corresponding to the current wind pressure is determined based on the expected surface shape variable, the expected surface deformation direction, and the target deformation range.

[0081] Specifically, when the expected surface shape variable does not exceed the allowable surface shape deformation limit corresponding to the expected surface shape deformation direction, the wind-induced deformation pre-compensation amount is determined to be zero; When the expected surface shape variable exceeds the allowable surface shape deformation limit corresponding to the expected surface shape deformation direction, the wind-induced deformation pre-compensation amount is determined based on the portion of the expected surface shape variable that exceeds the corresponding allowable surface shape deformation limit: ; In the formula, The amount is the pre-compensation for wind-induced deformation, expressed in mm.

[0082] It should be noted that the wind-induced deformation pre-compensation amount This is used to characterize the surface deformation of the grid surface that needs to be suppressed in advance through boundary pre-adjustment after the expected surface deformation exceeds the target deformation range under the current wind pressure; the wind-induced deformation pre-compensation amount The larger the value, the greater the extent to which the current expected surface deformation exceeds the target deformation range.

[0083] Furthermore, the boundary pre-adjustment displacement is determined based on the preset correspondence between the wind-induced deformation pre-compensation amount and the boundary adjustment displacement, and the boundary pre-adjustment direction is determined based on the expected surface deformation direction and the preset correspondence.

[0084] The preset correspondence is used to convert the shape variables of the mesh surface that need to be suppressed in advance into the adjustment displacement corresponding to the boundary of the target flexible shading net, and to establish the correspondence between different expected shape deformation directions and the corresponding boundary adjustment directions; specifically, the preset correspondence includes the conversion relationship between the deformation compensation amount and the boundary adjustment displacement, as well as the directional correspondence between the shape deformation state of the mesh surface and the adjustment direction of the boundary tension state.

[0085] In this embodiment, the conversion relationship between the deformation compensation amount and the boundary adjustment displacement is expressed using the boundary displacement conversion coefficient. The directional correspondence between the mesh surface deformation state and the boundary tensioning state adjustment direction is used to determine the boundary pre-adjustment direction of the tensioning mechanism based on the expected surface deformation direction.

[0086] Specifically, the boundary displacement transformation factor is used. The wind-induced deformation pre-compensation amount is converted into a boundary pre-adjustment displacement: ; In the formula, This represents the boundary pre-adjustment displacement, in mm; is the boundary displacement conversion coefficient, which is a dimensionless parameter; This indicates the amount of pre-compensation for wind-induced deformation, expressed in mm.

[0087] It should be noted that the boundary displacement transformation factor The boundary adjustment displacement, used to characterize the boundary deformation of a unit of the flexible shading net surface to be compensated, is set according to the net span, boundary constraint form, and degree of net surface deformation change corresponding to a unit boundary displacement. Its value ranges from 0.20 to 0.80. When the boundary displacement conversion coefficient is too small, the boundary pre-adjustment amount formed in a single control cycle is insufficient. When the boundary displacement conversion coefficient is too large, it is easy for the boundary adjustment amount to exceed the compensation requirement corresponding to the current expected deformation. In this embodiment, it is preferably set to 0.50.

[0088] Furthermore, the directional correspondence between the deformation state of the mesh surface and the boundary adjustment direction is set. Specifically, a boundary adjustment direction reference is established in advance based on two opposite movement directions of the tensioning mechanism. One of the movement directions is defined as the positive boundary adjustment direction, and the opposite movement direction is defined as the negative boundary adjustment direction. Based on the installation orientation of the tensioning mechanism relative to the boundary of the target flexible shading net, directional mapping relationships are established between the first out-of-plane direction and the second out-of-plane direction and the positive and negative boundary adjustment directions, respectively.

[0089] The direction mapping relationship is used to convert the expected surface deformation direction of the mesh into the movement direction of the tensioning mechanism that can suppress the corresponding surface deformation; wherein, as one embodiment of the present invention: When the boundary displacement generated by the tensioning mechanism moving in the positive direction of boundary adjustment can suppress the out-of-plane offset of the mesh surface in the first out-of-plane direction, a correspondence is established between the first out-of-plane direction and the positive direction of boundary adjustment, and a correspondence is established between the second out-of-plane direction and the negative direction of boundary adjustment. When the actual installation orientation of the tensioning mechanism is opposite to the above-mentioned installation orientation, a correspondence is established between the first outward direction and the negative direction of boundary adjustment, and a correspondence is established between the second outward direction and the positive direction of boundary adjustment.

[0090] Based on this, the direction mapping relationship is predetermined by the installation orientation of the tensioning mechanism relative to the boundary of the target flexible shade net. During the operation control process, the corresponding boundary adjustment direction is directly called according to the expected surface deformation direction, without the need to re-determine it in each control cycle.

[0091] In this embodiment, the direction mapping relationship is queried based on the expected surface deformation direction to determine the boundary pre-adjustment direction corresponding to the current wind-induced deformation pre-compensation amount.

[0092] Specifically, to unify the representation of the magnitude and direction of the boundary pre-adjustment displacement, a direction identifier is set as follows: When the determined boundary pre-adjustment direction is the positive direction of the boundary adjustment, let When the determined boundary pre-adjustment direction is the negative direction of the boundary adjustment, let When the predicted surface shape variable is within the target deformation range and the corresponding wind-induced deformation pre-compensation amount is zero, let ; Furthermore, based on the stated direction identifier quantity and boundary pre-adjustment displacement The wind-induced pre-regulation amount is obtained as follows: ; In the formula, This indicates the wind-induced pre-adjustment amount, in mm. This represents the directional identifier corresponding to the boundary pre-adjustment direction, and is a dimensionless parameter.

[0093] It should be noted that the aforementioned wind-induced pre-adjustment amount This is used to characterize the directional adjustment displacement that needs to be applied in advance to the boundary of the target flexible shading net in response to the expected excessive surface deformation under the current wind pressure; the absolute value of the wind-induced pre-adjustment amount represents the magnitude of the boundary pre-adjustment displacement, and its positive or negative sign represents the corresponding boundary pre-adjustment direction.

[0094] Furthermore, based on the mesh deformation data within the current control cycle, the current actual surface shape variable and actual surface shape deformation direction of the target flexible shading net relative to the target deployment position are determined.

[0095] When the mesh deformation data includes surface shape variables corresponding to multiple mesh positions of the target flexible shading net, the surface shape variable with the largest absolute value is selected as the current actual surface shape variable, and the out-of-plane direction corresponding to the surface shape variable is determined as the actual surface deformation direction; when the mesh deformation data corresponds to a single representative mesh position, the surface shape variable and its out-of-plane direction corresponding to the representative mesh position are used.

[0096] Compare the current actual surface shape variable and the actual surface deformation direction with the target deformation range: When the current actual surface shape variable does not exceed the allowable surface shape deformation limit corresponding to the actual surface shape deformation direction, the deformation deviation is determined to be zero; When the current actual surface shape variable exceeds the corresponding allowable surface shape variable limit, the deformation variable exceeding the allowable surface shape variable limit and the corresponding actual surface shape deformation direction are determined as the deformation deviation.

[0097] Furthermore, when the first out-of-plane direction and the second out-of-plane direction adopt the same allowable surface deformation limit value... At that time, the deformation deviation for: ; In the formula, This represents the magnitude of the deformation deviation, in mm. This represents the current actual surface shape variable, in mm; The allowable surface deformation limit is given in mm.

[0098] It should be noted that the aforementioned deformation deviation This is used to characterize the extent to which the current surface deformation of the target flexible shade net exceeds the target deformation range; wherein, the magnitude of the deformation deviation characterizes the extent of exceeding the range, and the actual surface deformation direction characterizes the deformation deviation. The corresponding spatial direction.

[0099] Furthermore, the feedback boundary adjustment displacement is determined based on a preset correspondence between the deformation deviation and the boundary adjustment displacement; in this embodiment, a boundary displacement conversion coefficient is used. Convert the magnitude of deformation deviation into feedback boundary adjustment displacement: ; In the formula, This indicates the feedback boundary adjustment displacement, in mm.

[0100] Specifically, the corresponding feedback adjustment direction is determined based on the actual surface deformation direction, and a feedback direction indicator is set. When the feedback adjustment direction is the positive direction of boundary adjustment, let When the feedback adjustment direction is the negative direction of the boundary adjustment, let When the deformation deviation is zero, let .

[0101] Furthermore, based on the feedback direction indicator and the feedback boundary adjustment displacement, the feedback adjustment amount is calculated: ; In the formula, This indicates the feedback adjustment amount, in mm. This represents the directional indicator quantity corresponding to the feedback adjustment direction, and is a dimensionless parameter.

[0102] It should be noted that the feedback adjustment amount The directional boundary adjustment displacement is used to characterize the deformation deviation that has occurred to the target flexible shade net and needs to be corrected by boundary adjustment; its absolute value represents the magnitude of the feedback boundary adjustment displacement, and its positive or negative sign represents the direction of feedback adjustment.

[0103] In this embodiment, due to the wind-induced pre-adjustment amount With feedback adjustment Both are assigned directional values ​​based on the same boundary adjustment direction reference, and both are boundary adjustment displacements. Therefore, the target boundary adjustment displacement corresponding to the current control cycle is obtained by algebraically superimposing the following formula. : ; in, Adjust the displacement for the target boundary, in mm.

[0104] When the wind-induced pre-adjustment amount With feedback adjustment When the signs are the same, it indicates that the boundary pre-adjustment demand formed by the current wind pressure prediction and the feedback adjustment demand formed by the current actual deformation correspond to the same boundary adjustment direction, and the two are superimposed in the same direction; when the wind-induced pre-adjustment amount With feedback adjustment When the signs are opposite, it indicates that the two correspond to opposite boundary adjustment directions. The target boundary adjustment displacement after mutual cancellation is obtained by algebraic superposition.

[0105] The target boundary adjustment displacement This is used to characterize the final directional adjustment displacement that the target flexible shading net boundary needs to perform in the current control cycle after considering the pre-adjustment demand corresponding to the current wind pressure and the feedback correction demand corresponding to the current actual net surface deformation; its absolute value indicates the magnitude of the boundary adjustment displacement that the tensioning mechanism needs to perform in subsequent steps, and its positive or negative sign indicates the corresponding boundary adjustment direction.

[0106] S6. Control the tensioning mechanism set at the boundary of the target flexible shading net to adjust the boundary tension state of the target flexible shading net according to the target boundary adjustment displacement, obtain the adjusted net surface deformation data, and determine the deformation deviation corresponding to the next control cycle based on the adjusted net surface deformation data.

[0107] In this embodiment, the directional boundary adjustment displacement (i.e., the target boundary adjustment displacement) is determined based on the directional assignment according to the boundary adjustment direction reference. Determine the magnitude of the current boundary adjustment displacement: ; In the formula, Adjust the displacement of the current boundary, in mm.

[0108] Furthermore, the current boundary adjustment direction is determined based on the sign of the target boundary adjustment displacement and the boundary adjustment direction reference preset in step S5: when When, the positive direction of the boundary adjustment is determined as the current boundary adjustment direction; when When, the negative direction of the boundary adjustment is determined as the current boundary adjustment direction; when At that time, no boundary displacement adjustment is performed, and the current boundary tension of the target flexible shade net is maintained.

[0109] The tensioning mechanism, positioned at the boundary of the target flexible shade net, is controlled to adjust in the direction of the current boundary by a certain amount. The boundary adjustment displacement is used to change the boundary tension state of the target flexible shade net.

[0110] In this case, the current boundary adjustment direction directly adopts the boundary adjustment direction reference established in step S5, without re-mapping the mesh surface deformation direction and the tensioning mechanism movement direction in step S6, so that the target boundary adjustment displacement output in step S5 can be directly used as the execution control quantity of the tensioning mechanism.

[0111] Furthermore, after the boundary control of the current control cycle ends, the deformation data of the target flexible shading net is obtained, and the actual surface deformation and actual surface deformation direction are determined based on the deformation data.

[0112] Specifically, when the mesh deformation data includes surface shape variables corresponding to multiple mesh positions of the target flexible shading net, the same mesh deformation state determination method as in step S5 is adopted, and the surface shape variable with the largest absolute value is selected as the adjusted actual surface shape variable, and the out-of-plane direction corresponding to the surface shape variable is determined as the adjusted actual surface deformation direction. When the mesh deformation data corresponds to a single representative mesh position, the surface deformation variable and the corresponding out-of-plane direction corresponding to that representative mesh position are used.

[0113] It is worth noting that the adjusted actual surface shape variable is used to characterize the out-of-plane offset of the target flexible shading net relative to the target deployment position after the boundary control of the current control cycle ends, and the unit is mm; the adjusted actual surface shape variable direction is used to characterize the out-of-plane offset corresponding to the first out-of-plane direction or the second out-of-plane direction.

[0114] In this embodiment, the adjusted actual surface shape variable and the actual surface shape deformation direction are compared with the target deformation range. Comparison: Specifically, when the adjusted actual surface shape variable does not exceed the allowable surface shape variable limit for the corresponding actual surface shape variable direction. When this occurs, it indicates that the surface deformation of the mesh after the boundary control of the current control cycle has been within the target deformation range, and the deformation deviation corresponding to the next control cycle is set to zero. When the adjusted actual surface shape variable exceeds the allowable surface shape variable limit value for the corresponding actual surface shape variable direction... When the remaining deformation exceeds the allowable surface deformation limit and the corresponding actual surface deformation direction is determined as the remaining deformation deviation.

[0115] Furthermore, let the adjusted actual surface shape variable be... Then, the same allowable surface deformation limit is applied in both the first and second out-of-plane directions. In the case of residual deformation deviation for: ; In the formula, Indicates the magnitude of the remaining deformation deviation, used to characterize the degree of surface deformation of the target flexible shading net that still exceeds the target deformation range after the boundary control of the current control cycle ends, in mm; This represents the actual surface shape variable after adjustment, in mm.

[0116] Furthermore, the remaining deformation deviation The deformation deviation corresponding to the next control cycle is determined; the mesh deformation state after the end of the boundary control of the current control cycle also constitutes the initial mesh deformation state of the target flexible shading net at the beginning of the next control cycle. Therefore, the deformation deviation corresponding to the next control cycle has a consistent data basis with the actual mesh deformation state at the beginning of the next control cycle.

[0117] When the deformation deviation corresponding to the next control cycle is zero, it indicates that the surface deformation of the mesh after the end of the previous control cycle is within the target deformation range; when the deformation deviation corresponding to the next control cycle is not zero, it indicates that there is still remaining surface deformation that needs to be corrected by feedback in the next control cycle.

[0118] In the next control cycle, the corresponding mesh data is reacquired, and the current tension state and wind-induced deformation response parameters of the target flexible shading net are updated according to steps S2 to S4. In step S5, a new wind-induced pre-adjustment amount is formed based on the mesh wind pressure state in the next control cycle, and a new target boundary adjustment displacement is determined in combination with the deformation deviation corresponding to the next control cycle, so as to continue to perform subsequent boundary tension state adjustment.

[0119] It should be noted that, in response to the problem that the effective pretension of the target flexible shade net changes after continuous sunlight exposure, causing a mismatch between the reference wind-induced deformation response parameters under the reference tension state and the current net tension state, this embodiment determines the effective pretension retention coefficient based on the change of the current effective pretension relative to the reference pretension, and pre-corrects the reference wind-induced deformation response parameters accordingly to obtain the current wind-induced deformation response parameters that match the current effective pretension. Furthermore, the wind-induced pre-adjustment amount is determined based on the current wind-induced deformation response parameters and the net surface wind pressure data in the current control cycle, and the target boundary adjustment displacement is determined in combination with the deformation deviation corresponding to the current actual net surface deformation. This controls the boundary tension state of the target flexible shade net, and the remaining deformation deviation after the boundary control ends is used for deformation adjustment in the next control cycle, thereby forming a dynamic compensation control process for the surface deformation of the target flexible shade net.

[0120] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets, characterized in that, Includes the following steps: S1. Obtain the mesh surface data corresponding to the target flexible shading net within the current control cycle, as well as the reference pretension of the target flexible shading net under the reference tension state and the reference wind-induced deformation response parameters corresponding to the reference pretension; The mesh data includes mesh wind pressure data, mesh temperature data, mesh tension data, and mesh deformation data; S2. Determine the current thermal state of the target flexible shade net based on the net surface temperature data, and combine the current thermal state with the net surface tension data to determine the current effective pretension characterizing the current net surface tension baseline; S3. Based on the degree of change of the current effective pretension relative to the reference pretension, calculate the effective pretension maintenance coefficient corresponding to the current control cycle; S4. Based on the effective pretension retention coefficient, the reference wind-induced deformation response parameters are corrected to obtain the current wind-induced deformation response parameters that match the current effective pretension. S5. Determine the wind-induced pre-adjustment amount based on the wind pressure data of the mesh surface and the current wind-induced deformation response parameters, and determine the deformation deviation of the target flexible shading net relative to the target deformation range based on the mesh surface deformation data. Calculate the target boundary adjustment displacement based on the wind-induced pre-adjustment amount and the deformation deviation. S6. Control the tensioning mechanism set at the boundary of the target flexible shading net to adjust the boundary tension state of the target flexible shading net according to the target boundary adjustment displacement, and obtain the adjusted net surface deformation data, and determine the deformation deviation corresponding to the next control cycle based on the adjusted net surface deformation data.

2. The control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets according to claim 1, characterized in that, In step S2, determining the current thermal state of the target flexible shading net based on the mesh surface temperature data involves the following steps: The mesh surface temperature data within the current control cycle is divided into multiple continuous temperature evaluation periods according to the acquisition time, and the corresponding representative mesh surface temperature is determined according to the mesh surface temperature data within each temperature evaluation period. Based on the direction and amount of temperature change of the representative mesh surface between adjacent temperature evaluation periods, the thermal state corresponding to each temperature evaluation period is determined, wherein the thermal state includes a heating state, a temperature stabilization state, and a cooling state. Determine the temperature evaluation period that maintains the same thermal state continuously from the end of the current control cycle, and determine the continuously maintained thermal state as the current thermal state; The time range during which the current thermal state is maintained is defined as the tension evaluation period.

3. The control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets according to claim 2, characterized in that, In step S2, the current effective pretension is determined by combining the current thermal state and the mesh tension data, involving the following steps: Extract the mesh surface wind pressure data and mesh surface tension data corresponding to each other within the tension evaluation period, and determine the wind pressure change based on the change in the mesh surface wind pressure data between adjacent acquisition times; The continuous time range in which the wind pressure change exceeds the preset wind pressure change threshold is defined as the transient wind pressure disturbance period, and the mesh tension data corresponding to the transient wind pressure disturbance period is determined. Exclude the mesh tension data corresponding to the transient wind pressure disturbance period from the mesh tension data corresponding to the tension evaluation period, statistically analyze the remaining mesh tension data to obtain the current tension baseline value, and determine the current tension baseline value as the current effective pretension.

4. The control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets according to claim 1, characterized in that, In step S3, calculating the effective pretension retention coefficient involves the following steps: Calculate the pretension difference between the current effective pretension and the reference pretension, and determine the direction of change of the current effective pretension relative to the reference pretension based on the sign of the pretension difference; Calculate the ratio between the current effective pretension and the reference pretension, and obtain the effective pretension retention coefficient based on the ratio.

5. The control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets according to claim 4, characterized in that, In step S4, determining the reference wind-induced deformation response parameters corresponding to the current control cycle involves the following steps: The current wind pressure value of the grid surface is determined based on the grid surface wind pressure data within the current control cycle; The current mesh surface wind pressure value is matched with multiple preset continuous wind pressure intervals to determine the target wind pressure interval to which the current mesh surface wind pressure value belongs; Obtain the reference wind-induced deformation response parameters corresponding to each wind pressure range under the reference tension state, and determine the reference wind-induced deformation response parameters corresponding to the target wind pressure range as the reference wind-induced deformation response parameters to be corrected for the current control cycle.

6. The control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets according to claim 5, characterized in that, In step S4, the correction of the reference wind-induced deformation response parameter to be corrected based on the effective pretension retention coefficient involves the following steps: The correction direction of the reference wind-induced deformation response parameter to be corrected is determined based on the sign of the pretension difference. Specifically, when the pretension difference is less than zero, the direction of increasing the correction of the reference wind-induced deformation response parameter to be corrected is determined; when the pretension difference is greater than zero, the direction of decreasing the correction of the reference wind-induced deformation response parameter to be corrected is determined. The correction amount of the response parameter corresponding to the current tension state of the target flexible shade net is determined based on the effective pretension retention coefficient. When the correction direction is to increase the correction direction, the correction amount of the response parameter is superimposed on the reference wind-induced deformation response parameter to be corrected to obtain the current wind-induced deformation response parameter; When the correction direction is a decreasing correction direction, the correction amount of the response parameter is subtracted from the reference wind-induced deformation response parameter to be corrected to obtain the current wind-induced deformation response parameter.

7. The control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets according to claim 1, characterized in that, In step S5, determining the wind-induced pre-adjustment amount based on the wind pressure data of the mesh surface and the current wind-induced deformation response parameters involves the following steps: Using the normal direction of the target flexible shade net as the directional reference, the current net surface wind pressure value and the corresponding wind pressure action direction are determined based on the net surface wind pressure data within the current control cycle. The expected surface shape variable under the current wind pressure is determined based on the current surface wind pressure value and the current wind-induced deformation response parameters, and the expected surface shape deformation direction corresponding to the expected surface shape variable is determined based on the wind pressure direction. Based on the predicted surface shape variable, the predicted surface shape deformation direction, and the target deformation range, determine the wind-induced deformation pre-compensation amount corresponding to the current wind pressure. Based on the preset correspondence between the wind-induced deformation pre-compensation amount and the boundary adjustment displacement, the corresponding boundary pre-adjustment displacement and boundary pre-adjustment direction are determined, and the boundary pre-adjustment displacement is assigned a direction value according to the preset boundary adjustment direction reference to obtain the wind-induced pre-adjustment amount.

8. The control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets according to claim 7, characterized in that, In step S5, the target boundary adjustment displacement is calculated based on the wind-induced pre-adjustment amount and deformation deviation, involving the following steps: The current actual surface shape variable and actual surface shape deformation direction of the target flexible shading net relative to the target deployment position are determined based on the mesh deformation data within the current control cycle. Compare the current actual surface shape variable and actual surface deformation direction with the target deformation range: When the current actual surface deformation exceeds the target deformation range, the deformation deviation is determined based on the amount of deformation exceeding the target deformation range and its direction; when the current actual surface deformation is within the target deformation range, the deformation deviation is determined to be zero. The feedback boundary adjustment displacement and the feedback adjustment direction are determined according to the preset correspondence between the deformation deviation and the boundary adjustment displacement, and the direction of the feedback boundary adjustment displacement is assigned according to the boundary adjustment direction reference to obtain the feedback adjustment amount. The target boundary adjustment displacement is obtained by algebraically superimposing the wind-induced pre-adjustment amount and the feedback adjustment amount according to the boundary adjustment direction reference.

9. The control method for dynamic compensation of wind-heat coupling deformation of large-span flexible shading nets according to claim 8, characterized in that, In step S6, adjusting the boundary tension of the target flexible shading net and determining the deformation deviation corresponding to the next control cycle involves the following steps: The current boundary adjustment direction is determined based on the sign of the target boundary adjustment displacement and the preset boundary adjustment direction reference, and the magnitude of the current boundary adjustment displacement is determined based on the absolute value of the target boundary adjustment displacement. The tensioning mechanism set at the boundary of the target flexible shade net is controlled to perform boundary adjustment according to the current boundary adjustment direction and the current boundary adjustment displacement, so as to change the boundary tension state of the target flexible shade net; Obtain the mesh deformation data after the end of the current control cycle boundary control, and determine the adjusted actual surface deformation and the actual surface deformation direction based on the mesh deformation data; The adjusted actual surface shape variable and the actual surface shape deformation direction are compared with the target deformation range to determine the deformation deviation.

Images