A method and control system for calculating the deformation of a composite cross-section member

Abstract

The application relates to the technical field of processing control, and discloses a deformation calculation method and a control system for a composite cross-section component, the system comprising a data monitoring module, a strain calculation module, a pressure identification module, a control strategy module and a PLC module; wherein: the data monitoring module is used for acquiring structure parameters and processing parameters of an execution component; the strain calculation module is used for calculating a strain displacement curve of the execution component based on the structure parameters and the processing parameters; the pressure identification module is used for calculating pressure distribution of a processing interface flow field based on the strain displacement curve; the control strategy module is used for calculating a processing quality error based on the pressure distribution; and the PLC module is used for calculating an adjustment amount of the processing parameters of the execution component based on the processing quality error. The application realizes fine closed-loop control between deformation of the execution component and printing quality, and improves the stability and precision of processing of the execution component.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of process control, and in particular to a deformation calculation method and control system for a composite cross-section component. BACKGROUND

[0002] In the printing process of a flexible substrate, the pressure and angle of the execution component are key factors affecting the pattern quality. In the traditional scheme, the angle and pressure of the execution component are usually preset by manual or open-loop electric control setting, and are adjusted by experience or trial and error to achieve the desired processing effect. However, the execution component itself as an elastic body will deform under the action of force in the processing process. The deformation curve will directly affect the contact length and contact pressure distribution between the execution component and the screen, thereby determining the processing effect. In the prior art, the processing of the deformation of the execution component is usually based on experimental parameter adjustment or finite element simulation method, which lacks real-time, universality and theoretical traceability. Especially, most of the current systems fail to take the actual stress deformation of the execution component into the control logic, resulting in the following problems: the setting of the execution component posture parameters lacks accuracy, leading to repeated debugging and low efficiency; the parameters cannot be adjusted according to the actual execution component deformation feedback, lacking self-adaptive ability; especially in the wedge-shaped execution component structure, the dynamic pressure near the sharp point shows a nonlinear sharp rising trend, but the traditional control logic often fails to identify the physical characteristics of this key area, and lacks the technical means to map the overall deformation of the execution component to the profile curve and pressure distribution; the dynamic pressure control in the existing system mostly relies on static setting, and cannot dynamically feedback according to the actual execution component shape, so the control optimization often has limited effect.

[0003] A circular screen printing machine synchronous control system is disclosed in Chinese Patent No. CN206696650U, which comprises a central processing unit, a printing unit control system, a synchronous controller, a fabric feeding unit, a drying unit and a fabric falling unit. The printing unit control system comprises a driving roller servo motor, a driven roller servo motor, a circular screen shaft servo motor, a scraper device and a servo controller. The fabric feeding unit comprises a fabric feeding roller and a fabric feeding motor. The drying unit comprises a drying conveying device and a drying room environment monitoring device arranged in the drying room. The drying conveying device comprises a drying conveyor belt and a drying motor. The drying room environment monitoring device comprises a temperature sensor, a humidity sensor, a heat exchanger, an exhaust fan and an STM32 controller. The fabric falling unit comprises a fabric collecting roller and a fabric collecting motor. The technical scheme adopts the printing unit control system and the synchronous controller to ensure that the linear speed of the fabric between the fabric feeding unit, the printing unit, the drying unit and the fabric falling unit of the circular screen printing machine is kept synchronous.

[0004] A scraper digital control system and a method for creating a database for the system are disclosed in Chinese patent application CN102520670A. The system includes a central processor, a data storage module, a human-computer interaction module, a manual scraper position adjustment module, an automatic scraper position adjustment module, and a scraper position data detection module. The data storage module includes a roll diameter and scraper position database. The central processor is electrically connected with the data storage module. The human-computer interaction module is electrically connected with the central processor. The manual scraper position adjustment module is electrically connected with the scraper position data detection module, and the scraper data detection module is electrically connected with the central processor. The automatic scraper position adjustment module is electrically connected with the central processor. With this scheme, when a coating roll or a plate roll with a different roll diameter is replaced, the roll diameter data can be directly input in the human-computer interaction module. The system automatically retrieves the corresponding optimal scraper position data from the database of the data storage module according to the roll diameter data, and adjusts the scraper position by using the automatic scraper position adjustment module.

[0005] The above technical solutions all have the problem raised in the background: unable to dynamically feedback the pressure and optimize the processing parameters according to the actual shape of the execution member.

[0006] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the general background of the application, and should not be taken as an acknowledgment or any form of suggestion that it forms the prior art that is already known to those of ordinary skill in the art. SUMMARY

[0007] The technical problem to be solved by the present application is to overcome the defects of the prior art, and to provide a deformation calculation method and control system for a composite cross-section member, which realizes fine closed-loop control between execution member deformation and printing quality, and improves the stability and precision of execution member processing.

[0008] To solve the above technical problems, the present application provides the following technical solutions:

[0009] In one aspect, the present application provides a control system for a composite cross-section member, comprising a data monitoring module, a strain calculation module, a pressure identification module, a control strategy module, and a PLC module; wherein:

[0010] The data monitoring module is used to obtain the structural parameters of the execution member, and to obtain or adjust the processing parameters of the execution member;

[0011] The strain calculation module calculates the strain displacement curve of the execution member based on the structural parameters and processing parameters of the execution member;

[0012] The pressure identification module calculates the edge profile curve of the execution member and the contact length between the execution member and the screen plate based on the strain displacement curve, and calculates the pressure distribution of the processing interface flow field based on the contact length and the edge profile curve;

[0013] The control strategy module calculates a processing quality error based on the pressure distribution and a pre-configured processing quality index;

[0014] The PLC module is configured to feedback control the processing parameters of the execution member, including: calculating an adjustment amount of the processing parameters of the execution member based on the processing quality error; and the data monitoring module adjusts the processing parameters of the execution member based on the adjustment amount.

[0015] As a preferred scheme of the control system of the composite cross-section member described in the present application, wherein: the structure parameters include shape parameters and material parameters of the execution member; the shape parameters include wedge angle, thickness, total height and wedge height of the execution member; and the material parameters include Young's modulus and Poisson's ratio of the material of the execution member.

[0016] The processing parameters of the execution member include processing angle and processing pressure.

[0017] The strain displacement curve is used to describe the strain displacement generated in the vertical direction when each position of the edge of the execution member is in contact with the screen plate.

[0018] The strain calculation module is configured with a first calculation unit and a second calculation unit; the strain calculation module is configured to calculate the strain displacement curve of the execution member, specifically including: dividing the execution member into a wedge-shaped part and a rectangular part, and calculating the strain displacement curve of the wedge-shaped part by the first calculation unit and calculating the strain displacement curve of the rectangular part by the second calculation unit.

[0019] As a preferred scheme of the control system of the composite cross-section member described in the present application, wherein: the first calculation unit calculates the strain displacement curve of the wedge-shaped part based on the structure parameters and the processing parameters of the execution member, specifically including:

[0020] A plane rectangular coordinate system is established with the vertex of the wedge-shaped part as the origin and the horizontal direction as the x-axis, as a global coordinate system.

[0021] A plane rectangular coordinate system is established with the vertex of the wedge-shaped part as the origin and the central axis of the execution member as the x-axis, as a local coordinate system; the included angle between the positive direction of the x-axis of the global coordinate system and the positive direction of the x-axis of the local coordinate system is the processing angle.

[0022] A polar coordinate system is established with the vertex of the wedge-shaped part as the pole and the central axis of the execution member as the polar axis.

[0023] A double-harmonic equation set in the polar coordinate system is constructed based on the structure parameters and the processing parameters of the execution member.

[0024] The double-harmonic equation is solved to obtain a strain displacement function of the wedge-shaped part in the polar coordinate system.

[0025] The strain displacement function of the wedge-shaped part in the polar coordinate system is converted into the strain displacement function of the wedge-shaped part in the local coordinate system by coordinate transformation, and is further converted into the strain displacement curve of the wedge-shaped part in the global coordinate system.

[0026] As a preferred scheme of the control system of the composite cross-section component described in the present application, wherein: the second calculation unit calculates the strain displacement curve of the rectangular part based on the structural parameters and processing parameters of the execution component, specifically comprising:

[0027] The elastic mechanics control equation set in the local coordinate system is constructed based on the structural parameters and processing parameters of the execution component;

[0028] The elastic mechanics control equation set is solved to obtain the strain displacement function of the rectangular part in the local coordinate system;

[0029] The strain displacement function of the rectangular part in the local coordinate system is converted into the strain displacement curve of the rectangular part in the global coordinate system by coordinate transformation.

[0030] As a preferred scheme of the control system of the composite cross-section component described in the present application, wherein: the pressure identification module is configured with a contour identification strategy; the contour identification strategy is used to calculate the contact length of the execution component and the screen, specifically comprising:

[0031] Based on the strain displacement curve, the strain displacement of each position of the edge of the execution component is calculated; the part of the edge of the execution component with strain displacement greater than 0 is marked as the contact edge section of the execution component and the screen; the length of the contact edge section is calculated to obtain the contact length;

[0032] The contour identification strategy is also used to calculate the edge contour curve of the execution component in the global coordinate system, and the formula is as follows:

[0033] ;

[0034] Wherein, is the equation of the edge contour curve, which represents the ordinate of the edge of the execution component at the abscissa x in the global coordinate system; is the strain displacement curve of the execution component, which represents the strain displacement of the edge of the execution component at the abscissa x in the global coordinate system; represents the processing angle; represents the wedge angle.

[0035] As a preferred scheme of the control system of the composite cross-section component described in the present application, wherein: the pressure identification module is also configured with a pressure identification strategy; the pressure identification strategy is used to calculate the pressure distribution of the processing interface flow field, specifically comprising:

[0036] Mark a distal end point of the global coordinate system in the contact edge segment as a contact edge point; establish a plane rectangular coordinate system as a flow field coordinate system with the contact edge point as the origin and a horizontal direction as the x-axis; calculate an equation of the edge profile curve under the flow field coordinate system , as follows:

[0037] ;

[0038] wherein, is the contact length;

[0039] Obtain the moving speed of the execution member and the fluid viscosity; based on the moving speed of the execution member, the fluid viscosity, the equation of the edge profile curve under the flow field coordinate system, and the pressure distribution function, construct a Reynolds equation;

[0040] Solve the Reynolds equation to obtain the pressure distribution function.

[0041] As a preferred scheme of the control system of the composite cross-section member described in the present application, wherein: the processing quality index comprises a pressure target value and a pressure target distribution function;

[0042] The control strategy module is configured with an error control strategy; the error control strategy is used to calculate a processing quality error, and specifically comprises:

[0043] The fluid pressure at a distance of from the vertex of the wedge-shaped part is calculated based on the pressure distribution function as a pressure observation value; is a preset observation distance;

[0044] The difference between the pressure observation value and the pressure target value is calculated as a first quality error;

[0045] In the region between a distance of and from the vertex of the wedge-shaped part, the difference between the pressure distribution function and the pressure target distribution function is integrated to obtain a second quality error; is a preset first detection distance, is a preset second detection distance;

[0046] The first quality error and the second quality error are weighted and summed to obtain the processing quality error; in the weighted sum, the sum of the weight coefficients of the first quality error and the weight coefficients of the second quality error is 1.

[0047] As a preferred scheme of the control system of the composite cross-section member described in the present application, wherein: the error control strategy further comprises adjusting the weight coefficients of the pressure target value and the pressure target distribution, specifically comprising:

[0048] setting with an initial value; wherein, is a weight coefficient of the first quality error, is a weight coefficient of the second quality error;

[0049] if the ratio of the pressure observation value to the pressure target value is less than 1, increasing based on the ratio of the pressure observation value to the pressure target value, and updating based on , and the smaller the ratio of the pressure observation value to the pressure target value, the greater the adjustment amount of

[0050] if the first quality error is less than a preset first error threshold in n consecutive observations, increasing based on the value of n, and updating based on , and the greater the value of n, the greater the adjustment amount of

[0051] As a preferred solution of the control system of the composite cross-section component described in the present application, wherein: the PLC module is configured with a PLC controller; the input of the PLC controller includes a processing quality error, and the output is an adjustment amount of a processing parameter; the adjustment amount of the processing parameter is any one of an adjustment amount of a processing pressure and an adjustment amount of a processing angle; the PLC module sends the adjustment amount of the processing parameter output by the PLC controller to the data monitoring module, and the data monitoring module sends the adjustment amount of the processing parameter to the control mechanism for controlling the movement of the execution component by interacting with the control mechanism; and the control mechanism adjusts the processing angle or the processing pressure of the execution component based on the adjustment amount of the processing parameter.

[0052] In a second aspect, the present application provides a deformation calculation method of a composite cross-section component, comprising the following steps:

[0053] obtaining the structure parameters and processing parameters of the execution component; and dividing the execution component into a wedge-shaped part and a rectangular part;

[0054] establishing a global coordinate system and a local coordinate system with the vertex of the wedge-shaped part as the origin; and establishing a polar coordinate system with the vertex of the wedge-shaped part as the pole;

[0055] constructing a double-harmonic equation group in the polar coordinate system based on the structure parameters and processing parameters of the execution component; and solving the double-harmonic equation group to obtain a strain displacement function of the wedge-shaped part in the polar coordinate system;

[0056] constructing an elasticity mechanics control equation group in the local coordinate system based on the structure parameters and processing parameters of the execution component; and solving the elasticity mechanics control equation group to obtain a strain displacement function of the rectangular part in the local coordinate system;

[0057] convert the strain displacement functions of the wedge-shaped portion and the rectangular portion into strain displacement curves of the wedge-shaped portion and the rectangular portion in a global coordinate system, respectively;

[0058] calculate an edge profile curve of the execution member based on the strain displacement curves and the machining angle and the wedge angle;

[0059] calculate a pressure distribution of a machining interface flow field based on the edge profile curve, and feedback adjust machining parameters of the execution member based on the pressure distribution.

[0060] Compared with the prior art, the application has the following beneficial effects:

[0061] The application solves the edge strain displacement of the wedge-shaped portion and the rectangular portion of the execution member in the polar coordinate system and the Cartesian coordinate system, respectively, improves the physical accuracy of the structural response modeling of the execution member, and further improves the sensitivity of the subsequent execution member control, the controllability and consistency of the slurry distribution, and the stability of the slurry permeability.

[0062] The application analyzes the characteristics of the dynamic pressure sudden increase area near the tool tip, designs a double error index system based on the pressure steep increase point and the overall pressure distribution error, improves the discrimination ability of the slurry transfer efficiency and the scraping uniformity, forms a control strategy that prioritizes ensuring the rationality of the dynamic pressure of the tool tip, and makes the overall control strategy not only pay attention to the precision guarantee of the local key flow area, but also coordinate the global printing uniformity, improve the overall consistency and adjustment ability of the scraping process. BRIEF DESCRIPTION OF DRAWINGS

[0063] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor. Among them:

[0064] Figure 1 a structural schematic diagram of a control system of a composite cross-section member provided by the application;

[0065] Figure 2 a sectional view of an execution member provided by the application;

[0066] Figure 3 a schematic diagram of a global coordinate system and a local coordinate system provided by the application;

[0067] Figure 4 a flowchart of a deformation calculation method of a composite cross-section member provided by the application. DETAILED DESCRIPTION

[0068] The technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0069] Embodiment 1

[0070] This embodiment introduces a control system of a composite cross-section component. Referring to Figure 1 , the system comprises a data monitoring module, a strain calculation module, a pressure identification module, a control strategy module, and a PLC module; wherein:

[0071] The data monitoring module is used to obtain the structure parameters of the execution component and obtain or adjust the processing parameters of the execution component.

[0072] The structure parameters include shape parameters and material parameters of the execution component; the shape parameters include wedge angle, thickness, total height and wedge height of the execution component; the material parameters include Young's modulus and Poisson's ratio of the material of the execution component; referring to Figure 2 , represents the wedge angle of the execution component; t represents the thickness; H represents the total height; and h represents the wedge height.

[0073] In this embodiment, the execution component is an elastic structure with a composite cross-section, and its boundary shape is affected by external load and participates in the flow field regulation or interface topography adjustment of the target task.

[0074] The processing parameters of the execution component include processing angle and processing pressure. Referring to Figure 3 , represents the processing angle.

[0075] Optionally, the data monitoring module obtains or adjusts the processing parameters of the execution component by data interaction with the control mechanism for controlling the movement of the execution component; for example, the processing pressure is extracted or adjusted by the load value of the electric pressure actuator, and the processing angle is extracted or adjusted by the encoder.

[0076] The strain calculation module calculates the strain displacement curve of the execution component based on the structure parameters and processing parameters of the execution component.

[0077] The strain displacement curve is used to describe the strain displacement generated in the vertical direction when each position of the edge of the execution component is in contact with the screen.

[0078] The strain calculation module is configured with a first calculation unit and a second calculation unit; the strain calculation module is used for calculating the strain displacement curve of the execution member, specifically including: dividing the execution member into a wedge-shaped part and a rectangular part, and calculating the strain displacement curve of the wedge-shaped part through the first calculation unit, and calculating the strain displacement curve of the rectangular part through the second calculation unit;

[0079] The first calculation unit calculates the strain displacement curve of the wedge-shaped part based on the structure parameters and processing parameters of the execution member, specifically including:

[0080] A plane rectangular coordinate system is established with the vertex of the wedge-shaped part as the origin and the horizontal direction as the x-axis, as the global coordinate system; as shown in Figure 3 , The x-axis of the global coordinate system is represented; The y-axis of the global coordinate system is represented;

[0081] A plane rectangular coordinate system is established with the vertex of the wedge-shaped part as the origin and the central axis of the execution member as the x-axis, as the local coordinate system; the included angle between the positive direction of the x-axis of the global coordinate system and the positive direction of the x-axis of the local coordinate system is the processing angle; as shown in Figure 3 , The x-axis of the local coordinate system is represented; The y-axis of the local coordinate system is represented;

[0082] An polar coordinate system is established with the vertex of the wedge-shaped part as the pole and the central axis of the execution member as the polar axis;

[0083] Based on the structure parameters and processing parameters of the execution member, the double-harmonic equation set under the polar coordinate system is constructed; the double-harmonic equation set is transformed by Airy stress function method, and is solved by characteristic function expansion method, to obtain the strain displacement function of the wedge-shaped part under the polar coordinate system;

[0084] The double-harmonic equation set describes the functional relationship between the strain displacement of the wedge-shaped part under the polar coordinate system and the processing pressure, the processing angle, the Young's modulus, the Poisson's ratio, and the wedge angle, for continuous distribution solving of the stress or strain displacement function. In the embodiment, the processing pressure, the processing angle, the Young's modulus, the Poisson's ratio, and the wedge angle are all obtained parameters, which can be used for solving the double-harmonic equation set.

[0085] Through coordinate transformation, the strain displacement function of the wedge-shaped part under the polar coordinate system is converted into the strain displacement function under the local coordinate system, and is further converted into the strain displacement curve of the wedge-shaped part under the global coordinate system.

[0086] The second calculation unit calculates the strain displacement curve of the rectangular part based on the structure parameters and processing parameters of the execution member, specifically including:

[0087] constructing an elastic mechanics control equation set in the local coordinate system based on the structure parameters of the execution member and the processing parameters; solving the elastic mechanics control equation set by the Airy stress function method and the characteristic function expansion method to obtain strain displacement functions of the rectangular part in the local coordinate system;

[0088] convert the strain displacement functions of the rectangular part in the local coordinate system into strain displacement curves of the rectangular part in the global coordinate system through coordinate transformation.

[0089] The elastic mechanics control equation set includes a balance equation, a geometric equation, and a constitutive relation equation; the balance equation is used to describe the relationship between the stress distribution of the rectangular part and the external load (including the processing pressure and the processing angle); the constitutive relation equation, such as Hooke's law, is used to express the proportional relationship between the stress distribution and the strain tensor based on the Young's modulus and the Poisson's ratio; the geometric equation is used to describe the relationship between the strain displacement of the rectangular part and the strain tensor; by solving the above equation set, the strain displacement of the edge of the rectangular part can be obtained under the premise that the external load, the Young's modulus, and the Poisson's ratio are known, so as to obtain the strain displacement functions of the rectangular part in the local coordinate system.

[0090] The pressure identification module calculates the edge profile curve of the execution member and the contact length between the execution member and the screen based on the strain displacement curves, and calculates the pressure distribution of the processing interface flow field based on the contact length and the edge profile curve;

[0091] The pressure identification module is configured with a profile identification strategy; the profile identification strategy is used to calculate the contact length between the execution member and the screen, and specifically includes:

[0092] Based on the strain displacement curves, the strain displacement of each position of the edge of the execution member is calculated; the part of the execution member edge with a strain displacement greater than 0 is marked as a contact edge section of the execution member and the screen; the length of the contact edge section is calculated to obtain the contact length;

[0093] The profile identification strategy is also used to calculate the edge profile curve of the execution member in the global coordinate system, and the formula is as follows:

[0094] ;

[0095] wherein, is the equation of the edge profile curve, representing the vertical coordinate of the edge of the execution member at the horizontal coordinate x in the global coordinate system; is the strain displacement curve of the execution member, representing the strain displacement of the edge of the execution member at the horizontal coordinate x in the global coordinate system; represents the processing angle; represents the wedge angle; To execute the angle between the edge of the component and the x-axis of the global coordinate system.

[0096] The pressure identification module is also configured with a pressure identification strategy; the pressure identification strategy is used to calculate the pressure distribution of the processing interface flow field, and specifically includes:

[0097] Mark the distal end point of the global coordinate system in the contact edge segment as a contact edge point; establish a plane rectangular coordinate system as a flow field coordinate system with the contact edge point as the origin and the horizontal direction as the x-axis; calculate the equation of the edge profile curve under the flow field coordinate system , the formula is as follows:

[0098] ;

[0099] wherein, is the contact length;

[0100] Obtain the moving speed of the execution component and the fluid viscosity; based on the moving speed of the execution component, the fluid viscosity, the equation of the edge profile curve under the flow field coordinate system, and the pressure distribution function, construct the Reynolds equation;

[0101] Solve the Reynolds equation to obtain the pressure distribution function.

[0102] In this embodiment, the fluid in the processing interface flow field is regarded as a two-dimensional steady-state thin film fluid, and then the pressure distribution thereof can be described by the Reynolds equation; the Reynolds equation is converted into a system of ordinary differential equations and solved by finite difference or numerical integration, so that the pressure distribution function is obtained, which is denoted as , and is used to describe the fluid pressure at different positions along the x-axis in the flow field coordinate system.

[0103] The control strategy module calculates a processing quality error based on the pressure distribution and a preconfigured processing quality index;

[0104] The processing quality index includes a pressure target value and a pressure target distribution function;

[0105] The control strategy module is configured with an error control strategy; the error control strategy is used to calculate the processing quality error, and specifically includes:

[0106] The fluid pressure at a distance of from the vertex of the wedge-shaped part is calculated based on the pressure distribution function as a pressure observation value; is a preset observation distance;

[0107] The difference between the pressure observation value and the pressure target value is calculated as a first quality error;

[0108] The fluid pressure changes slowly far from the vertex of the wedge-shaped portion; the fluid pressure rises steeply near the vertex of the wedge-shaped portion, and the high pressure at this position is a key factor for achieving the filling of the screen mesh with the paste. The first quality error measures whether the pressure near the vertex of the wedge-shaped portion is sufficient, and the first quality error is suppressed by PID control, which can ensure that the paste is successfully pressed into the screen mesh.

[0109] In the region with a distance of to from the vertex of the wedge-shaped portion, the second quality error is obtained by integrating the difference between the pressure distribution function and the pressure target distribution function; The first detection distance is preset, and the second detection distance is preset.

[0110] The second quality error is used to quantify the overall deviation between the current pressure distribution curve and the preset target distribution, and reflects the fluid consistency and the uniformity of the squeegee process. By reducing the second quality error through PID control, problems such as empty printing, ink flying, and residue caused by unreasonable pressure distribution in the direction of the moving execution component can be prevented.

[0111] The first quality error and the second quality error are weighted and summed to obtain the processing quality error; in the weighted sum, the sum of the weight coefficient of the first quality error and the weight coefficient of the second quality error is 1.

[0112] Optionally, before calculating the processing quality error, the first quality error and the second quality error are normalized and de-dimensioned, respectively.

[0113] The error control strategy further includes adjusting the weight coefficients of the pressure target value and the pressure target distribution, specifically including:

[0114] The initial values of and are set; wherein, is the weight coefficient of the first quality error, is the weight coefficient of the second quality error.

[0115] If the ratio of the pressure observation value to the pressure target value is less than 1, then is increased based on the ratio of the pressure observation value to the pressure target value, and is updated based on , and the smaller the ratio of the pressure observation value to the pressure target value, the greater the adjustment amount of

[0116] If the first quality error is less than the preset first error threshold in consecutive n observations, then is increased based on the value of n, and is updated based on , and the larger n is, , the larger the adjustment amount of the processing parameter is.

[0117] Based on the above error control strategy, the filling effect of the slurry can be ensured at an early stage of processing, and then smoothly transitioned to the quality control target of uniform overall filling.

[0118] The PLC module is configured to feedback control the processing parameter of the execution member, including: calculating an adjustment amount of the processing parameter of the execution member based on the processing quality error; and adjusting the processing parameter of the execution member based on the adjustment amount by the data monitoring module.

[0119] The PLC module is configured with a PLC controller; the input of the PLC controller includes the processing quality error, and the output is the adjustment amount of the processing parameter; the adjustment amount of the processing parameter is any one of the adjustment amount of the processing pressure and the adjustment amount of the processing angle; the PLC module sends the adjustment amount of the processing parameter output by the PLC controller to the data monitoring module, and the data monitoring module sends the adjustment amount of the processing parameter to the control mechanism for controlling the movement of the execution member through data interaction with the control mechanism; and the control mechanism adjusts the processing angle or the processing pressure of the execution member based on the adjustment amount of the processing parameter. Through the feedback control of the PLC module, the processing quality error can be gradually minimized to ensure the processing quality of the execution member.

[0120] Embodiment 2

[0121] This embodiment is the second embodiment of the present application; based on the same inventive concept as embodiment 1, refer to Figure 4 This embodiment introduces a deformation calculation method of a composite cross-section member, including the following steps:

[0122] Obtain the structure parameters and processing parameters of the execution member; divide the execution member into a wedge-shaped part and a rectangular part;

[0123] Establish a global coordinate system and a local coordinate system with the vertex of the wedge-shaped part as the origin; and establish a polar coordinate system with the vertex of the wedge-shaped part as the pole;

[0124] Construct a double-harmonic equation group in the polar coordinate system based on the structure parameters and processing parameters of the execution member; solve the double-harmonic equation group to obtain the strain displacement function of the wedge-shaped part in the polar coordinate system; the double-harmonic equation group describes the functional relationship between the strain displacement of the wedge-shaped part in the polar coordinate system and the processing pressure, the processing angle, the Young's modulus, the Poisson's ratio, and the wedge angle; by transforming the double-harmonic equation group through the Airy stress function method and solving it through the characteristic function expansion method, a continuous distribution solution of the stress or strain displacement function can be established, and the strain displacement function of the wedge-shaped part in the polar coordinate system is obtained.

[0125] constructing an elastic mechanics control equation set in a local coordinate system based on the structure parameters and the processing parameters of the execution member; solving the elastic mechanics control equation set to obtain a strain displacement function of the rectangular part in the local coordinate system; the elastic mechanics control equation set comprises a balance equation, a geometry equation, and a constitutive relation equation; the geometry equation is used to describe the relationship between the strain displacement of the rectangular part and the strain variable; the constitutive relation equation expresses the proportional relationship between stress and strain based on Young's modulus and Poisson's ratio; and the balance equation restricts the stress change based on the processing pressure and the processing angle. By solving the above equation set, the strain displacement of the edge of the rectangular part can be obtained.

[0126] respectively converting the strain displacement functions of the wedge-shaped part and the rectangular part into strain displacement curves of the wedge-shaped part and the rectangular part in a global coordinate system;

[0127] calculating an edge profile curve of the execution member based on the strain displacement curves and the processing angle and the wedge angle;

[0128] calculating the pressure distribution of the processing interface flow field based on the edge profile curve, and feeding back and adjusting the processing parameters of the execution member based on the pressure distribution.

[0129] The specific function implementation of each step above can refer to the related content of the control system of the composite cross-section member described in Embodiment 1, and will not be described here.

[0130] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0131] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative and not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose and the protected scope of the present application, and these all belong to the protection of the present application.

Claims

1. A control system for a composite cross-section member, characterized by: The system comprises a data monitoring module, a strain calculation module, a pressure identification module, a control strategy module and a PLC module. The data monitoring module is configured to obtain the structural parameters of the execution component and to obtain or adjust the processing parameters of the execution component. The structural parameters include shape parameters and material parameters of the execution component. The shape parameters include wedge angle, thickness, total height and wedge height of the execution component. The material parameters include Young's modulus and Poisson's ratio of the material of the execution component. The processing parameters of the execution component include processing angle and processing pressure. The strain calculation module is configured to calculate the strain displacement curve of the execution component based on the structural parameters and the processing parameters of the execution component. Mark the distal end point of the global coordinate system in the contact edge segment as a contact edge point; establish a plane rectangular coordinate system as a flow field coordinate system with the contact edge point as the origin and the horizontal direction as the x-axis; calculate the equation of the edge profile curve under the flow field coordinate system , as follows: ； wherein is the contact length; The strain displacement curve is used to describe the strain displacement of each position of the edge of the execution component in the vertical direction when the execution component contacts the screen. The strain calculation module comprises a first calculation unit and a second calculation unit. The strain calculation module is configured to calculate the strain displacement curve of the execution component, specifically including: dividing the execution component into a wedge-shaped part and a rectangular part, calculating the strain displacement curve of the wedge-shaped part by the first calculation unit, and calculating the strain displacement curve of the rectangular part by the second calculation unit. The pressure identification module is configured to calculate the edge profile curve of the execution component and the contact length between the execution component and the screen based on the strain displacement curve, and to calculate the pressure distribution of the processing interface flow field based on the contact length and the edge profile curve.

2. A control system for a composite cross-section member as claimed in claim 1, characterized in that: The pressure identification module is configured with a pressure identification strategy. The pressure identification strategy is configured to calculate the pressure distribution of the processing interface flow field, specifically including: obtaining the moving speed of the execution component and the viscosity of the fluid, and constructing the Reynolds equation based on the moving speed of the execution component, the viscosity of the fluid, the equation of the edge profile curve in the flow field coordinate system and the pressure distribution function; solving the Reynolds equation to obtain the pressure distribution function; The control strategy module is configured to calculate the processing quality error based on the pressure distribution and the pre-configured processing quality index. The PLC module is configured to feedback control the processing parameters of the execution component, including: calculating the adjustment amount of the processing parameters of the execution component based on the processing quality error, and adjusting the processing parameters of the execution component based on the adjustment amount by the data monitoring module. The first calculation unit is configured to calculate the strain displacement curve of the wedge-shaped part based on the structural parameters and the processing parameters of the execution component, specifically including: establishing a plane rectangular coordinate system as a global coordinate system with the vertex of the wedge-shaped part as the origin and the horizontal direction as the x-axis; establishing a plane rectangular coordinate system as a local coordinate system with the vertex of the wedge-shaped part as the origin and the central axis of the execution component as the x-axis; the angle between the positive direction of the x-axis of the global coordinate system and the positive direction of the x-axis of the local coordinate system is the processing angle; establishing a polar coordinate system with the vertex of the wedge-shaped part as the pole and the central axis of the execution component as the polar axis; constructing a double-harmonic equation set in the polar coordinate system based on the structural parameters and the processing parameters of the execution component; solving the double-harmonic equation to obtain the strain displacement function of the wedge-shaped part in the polar coordinate system. The strain displacement function of the wedge-shaped part in the polar coordinate system is converted into the strain displacement function of the wedge-shaped part in the local coordinate system through coordinate transformation, and is further converted into the strain displacement curve of the wedge-shaped part in the global coordinate system.

3. A control system for a composite cross-section member as claimed in claim 2, characterized in that: The second calculation unit calculates the strain displacement curve of the rectangular part based on the structural parameters and the processing parameters of the execution member, and specifically includes the following steps: The elasticity mechanics control equation set in the local coordinate system is constructed based on the structural parameters and the processing parameters of the execution member; The elasticity mechanics control equation set is solved to obtain the strain displacement function of the rectangular part in the local coordinate system; The strain displacement function of the rectangular part in the local coordinate system is converted into the strain displacement curve of the rectangular part in the global coordinate system through coordinate transformation.

4. A control system for a composite cross-section member as claimed in claim 3, characterized in that: The pressure identification module is configured with a contour identification strategy; The contour identification strategy is used to calculate the contact length of the execution member and the screen, and specifically includes the following steps: Based on the strain displacement curve, the strain displacement of each position on the edge of the execution member is calculated; the part of the execution member edge with a strain displacement greater than 0 is marked as the contact edge section of the execution member and the screen; and the length of the contact edge section is calculated to obtain the contact length. The contour identification strategy is also used to calculate the edge contour curve of the execution member in the global coordinate system, and the formula is as follows: ； wherein, is an equation of an edge profile curve representing a longitudinal coordinate of an edge of the performing member at a lateral coordinate x in the global coordinate system; is a strain displacement curve of the performing member representing a strain displacement of an edge of the performing member at a lateral coordinate x in the global coordinate system; represents a machining angle; represents a wedge angle.

5. A control system for a composite cross-section member as claimed in claim 4, characterised in that: The processing quality index includes a pressure target value and a pressure target distribution function; The control strategy module is configured with an error control strategy; The error control strategy is used to calculate the processing quality error, and specifically includes the following steps: The distance to the vertex of the wedge is calculated based on the pressure distribution function. The fluid pressure at that location is used as the observed pressure value; The preset observation distance; The difference between the pressure observation value and the pressure target value is calculated as a first quality error; In the region between a distance of to between the vertex of the wedge-shaped portion and the vertex of the circular arc, the difference between the pressure distribution function and the pressure target distribution function is integrated to obtain a second mass error; The first detection distance is preset, The second detection distance is preset; The first quality error and the second quality error are weighted and summed to obtain the processing quality error; in the weighted sum, the sum of the weight coefficients of the first quality error and the weight coefficients of the second quality error is 1.

6. A control system for a composite cross-section member as claimed in claim 5, characterised in that: The error control strategy also includes adjusting the weight coefficients of the pressure target value and the pressure target distribution, and specifically includes the following steps: Setting with an initial value; wherein, is a weight coefficient of the first mass error, is a weight coefficient of the second mass error; If the ratio of the pressure observation value to the pressure target value is less than 1, the adjustment amount is increased based on the ratio of the pressure observation value to the pressure target value , and based on the update , and the smaller the ratio of the pressure observation value to the pressure target value, the larger the adjustment amount. If, in n consecutive observations, the first quality error is less than a preset first error threshold, then the value of n is increased. and based on renew And the larger n is, The larger the adjustment amount.

7. A control system for a composite cross-section member as claimed in claim 6, characterised in that: The PLC module is configured with a PLC controller; the input of the PLC controller includes the processing quality error, and the output is the adjustment amount of the processing parameter; the adjustment amount of the processing parameter is any one of the adjustment amount of the processing pressure and the adjustment amount of the processing angle; the PLC module sends the adjustment amount of the processing parameter output by the PLC controller to the data monitoring module, and the data monitoring module sends the adjustment amount of the processing parameter to the control mechanism for controlling the movement of the execution member through data interaction with the control mechanism; and the control mechanism adjusts the processing angle or the processing pressure of the execution member based on the adjustment amount of the processing parameter.

8. A method for calculating the deformation of a composite cross-section member, implemented on the basis of a control system of a composite cross-section member according to any one of claims 1-7; characterized by: The following steps are included: Obtaining the structural parameters and the processing parameters of the execution member; Dividing the execution member into a wedge-shaped part and a rectangular part; A global coordinate system and a local coordinate system are established with the vertex of the wedge-shaped part as the origin; and a polar coordinate system is established with the vertex of the wedge-shaped part as the pole; A double-harmonic equation set in the polar coordinate system is constructed based on the structural parameters and the processing parameters of the execution member; and the double-harmonic equation set is solved to obtain the strain displacement function of the wedge-shaped part in the polar coordinate system; constructing an elastic mechanics control equation set in a local coordinate system based on the structure parameters and the processing parameters of the execution member; solving the elastic mechanics control equation set to obtain a strain displacement function of the rectangular part in the local coordinate system; respectively converting the strain displacement functions of the wedge-shaped part and the rectangular part into strain displacement curves of the wedge-shaped part and the rectangular part in a global coordinate system; calculating an edge profile curve of the execution member based on the strain displacement curves and the processing angle and the wedge angle; calculating a pressure distribution of a processing interface flow field based on the edge profile curve, and feeding back and adjusting the processing parameters of the execution member based on the pressure distribution.

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