Method, device, equipment and storage medium for analyzing wiper arm rigidity

Abstract

The application relates to a wiper arm rigidity analysis method, device, equipment and storage medium, which comprises the following steps: determining a wiper arm lifting angle value and a tension spring tension value when a wiper arm pressure and the tension spring tension are at extreme points; based on the wiper arm lifting angle value, performing assembly constraint on an angle between an extension arm and a connecting head in a created first assembly model to obtain a second assembly model; respectively applying the tension spring tension value to analysis events created in the second assembly model to obtain corresponding wiper arm deformation displacement results; and determining whether the wiper arm rigidity meets design requirements based on the wiper arm deformation displacement results. The wiper arm rigidity analysis method has the advantages that, on the one hand, the wiper arm rigidity analysis of all analysis events is covered, and on the other hand, the wiper arm rigidity is determined to meet the design requirements by using the wiper arm deformation displacement results of all analysis events, so that the accuracy of the wiper arm rigidity analysis is improved.

Description

Technical Field

[0001] This application relates to the field of automotive windshield wipers, specifically to a method, apparatus, device, and storage medium for analyzing the stiffness of a windshield wiper arm. Background Technology

[0002] The wiper arm is a crucial component of a car's windshield wipers. One end of the wiper arm is mounted on the output shaft of the wiper motor, while the other end connects to the wiper blade and applies pressure to it. Driven by the wiper motor, the wiper arm clears rainwater and cleans the glass. During operation, the wiper arm must withstand the impact and torsion of the wiper blade. Therefore, sufficient rigidity is essential to prevent vibration, noise, and incomplete wiping. Current solutions, such as increasing the wiper arm thickness or using a larger connecting rod cross-section, easily improve rigidity. However, this increases the arm's weight, raising both cost and the impact of its weight on the wiper blade's pressure, leading to increased overall wiper noise. Therefore, a method for optimizing wiper arm rigidity is needed. Summary of the Invention

[0003] The purpose of this application is to provide a method, apparatus, device, and storage medium for analyzing the stiffness of a wiper arm, so as to solve the problem that the existing technology cannot optimize the design and analysis of wiper arm stiffness.

[0004] The technical solution adopted in this application is as follows: A method for analyzing the stiffness of a wiper arm includes: determining the wiper arm lifting angle and the spring tension value when the wiper arm pressure and the spring tension are at extreme points; based on the wiper arm lifting angle value, applying assembly constraints to the angle between the extension arm and the connector in a first assembly model to obtain a second assembly model; applying the spring tension value to the analysis events created in the second assembly model to obtain the corresponding wiper arm deformation displacement results; and based on the wiper arm deformation displacement results, determining whether the wiper arm stiffness meets the design requirements.

[0005] Based on the aforementioned technical methods, firstly, the scraper arm lifting angle and tension spring force values ​​are determined when the scraper arm pressure and tension spring force are at their extreme points. This provides a basis for subsequent assembly constraints between the extension arm and connector in the assembly model according to the scraper arm lifting angle and for applying tension spring force to the analysis events. Secondly, based on the scraper arm lifting angle value, assembly constraints are applied to the angle between the extension arm and connector in the first assembly model to obtain the second assembly model. This achieves assembly constraints between the extension arm and connector in the assembly model according to the scraper arm lifting angle. Then, tension spring force values ​​are applied to the analysis events created in the second assembly model to obtain the corresponding scraper arm deformation displacement results. This achieves scraper arm stiffness analysis for the analysis events created in the assembly model. Finally, based on the scraper arm deformation displacement results, it is determined whether the scraper arm stiffness meets the design requirements, thus improving the accuracy of the scraper arm stiffness analysis.

[0006] Furthermore, determining whether the stiffness of the scraper arm meets the design requirements based on the displacement result of the scraper arm deformation includes: analyzing the displacement diagram corresponding to the displacement result of the scraper arm deformation to obtain the displacement change value at the end of the scraper arm; and determining whether the stiffness of the scraper arm meets the design requirements based on the displacement change value at the end of the scraper arm.

[0007] Based on the aforementioned technical methods, by analyzing the displacement diagram corresponding to the deformation of the scraper arm, and using the displacement change value at the end of the scraper arm obtained after analysis, it can be determined whether the scraper arm stiffness meets the design requirements. In this way, users can intuitively see the displacement change value at the end of the scraper arm through the displacement diagram, and thus determine whether the scraper arm stiffness meets the design requirements based on the displacement change value at the end of the scraper arm.

[0008] Furthermore, the created analysis events include the following four analysis events: applying a positive force, a negative force, a positive torque, and a negative torque to both sides of the connector respectively; the analysis of the displacement map corresponding to the displacement result of the scraper arm deformation to obtain the displacement change value of the scraper arm end includes: visualizing the displacement result of the scraper arm deformation corresponding to each analysis event to obtain the displacement map of the scraper arm for each analysis event; and analyzing the displacement map of the scraper arm for each analysis event to obtain the displacement change value of the scraper arm end for each analysis event.

[0009] Based on the aforementioned technical methods, the displacement results of the scraper arm deformation corresponding to each analysis event are visualized, and the displacement diagram of the scraper arm after visualization for each analysis event is analyzed to obtain the displacement change value of the scraper arm end for each analysis event. In this way, users can intuitively see the displacement change value of the scraper arm end for each analysis event through the scraper arm displacement diagram.

[0010] Furthermore, determining the scraper arm lifting angle and tension spring force values ​​when the scraper arm pressure and tension spring force are at their extreme points includes: acquiring a first curve of the scraper arm pressure versus time and a second curve of the tension spring force versus time; determining the scraper arm pressure value when the scraper arm pressure is at its maximum value based on the first curve, thereby determining the scraper arm lifting angle value; and determining the tension spring force value when the tension spring force is at its minimum value based on the second curve.

[0011] Based on the aforementioned technical means, firstly, the first variation curve of the scraper arm pressure versus time and the second variation curve of the tension spring force versus time are obtained. This provides a basis for subsequently determining the scraper arm pressure value when the scraper arm pressure is at its maximum and the tension spring force value when the tension spring force is at its minimum. Then, the scraper arm pressure value when the scraper arm pressure is at its maximum is determined through the first variation curve of the scraper arm pressure versus time, thereby determining the scraper arm lifting angle value. Finally, the tension spring force value when the tension spring force is at its minimum is determined through the second variation curve of the tension spring force versus time.

[0012] Furthermore, obtaining the first variation curve of the wiper arm pressure versus time and the second variation curve of the tension spring force versus time includes: obtaining the wiper arm lifting angle and the wiper brush flipping angle of the wiper in one working cycle; inputting the wiper arm lifting angle and the wiper brush flipping angle of the wiper in one working cycle into the model equation of the wiper arm pressure to obtain the first variation curve of the wiper arm pressure versus time; inputting the wiper arm lifting angle and the wiper brush flipping angle of the wiper in one working cycle into the model equation of the tension spring force to obtain the second variation curve of the tension spring force versus time; wherein, the model equation of the wiper arm pressure and the model equation of the tension spring force are both determined by establishing balance equations based on the components composed of connectors, connecting rods, extension arms, and rivets as the analysis objects.

[0013] Based on the aforementioned technical means, firstly, the wiper arm lifting angle and wiper blade rotation angle are obtained within one working cycle of the wiper. This provides a basis for subsequently determining the first variation curve of wiper arm pressure versus time and the second variation curve of spring tension versus time. Then, the wiper arm lifting angle and wiper blade rotation angle within one working cycle are input into the model equation of wiper arm pressure to determine the first variation curve of wiper arm pressure versus time. Finally, the wiper arm lifting angle and wiper blade rotation angle within one working cycle are input into the model equation of spring tension to determine the second variation curve of spring tension versus time.

[0014] Furthermore, the step of applying the tension spring value to the analysis events created in the second assembly model to obtain the corresponding displacement results of the scraper arm deformation includes: using a finite element analysis module to mesh the second assembly model to obtain a meshed assembly model; performing a mesh quality check on the meshed assembly model to obtain a mesh-checked assembly model; if the mesh quality in the mesh-checked assembly model is greater than a preset mesh quality, sequentially creating connection relationships and connection characteristics of the scraper arm components to obtain a third assembly model; sequentially creating dummy components and adding constraints to the scraper arm components in the third assembly model to obtain a fourth assembly model; and applying the tension spring value to the analysis events created in the fourth assembly model to obtain the corresponding displacement results of the scraper arm deformation.

[0015] Based on the aforementioned technical methods, firstly, the second assembly model is meshed using the finite element analysis module to obtain a meshed assembly model. This allows for simultaneous assembly model design and finite element analysis, thereby improving design efficiency. Secondly, the meshed assembly model undergoes a mesh quality check, resulting in a mesh-quality-checked assembly model. If the mesh quality fails to meet the "Good" standard (more than 90%), the mesh is optimized, reducing the impact of mesh quality on the assembly model. Thirdly, if the mesh quality in the mesh-quality-checked assembly model exceeds the preset mesh quality, the connection relationships and characteristics of the scraper arm components are sequentially created, resulting in a third assembly model. This provides a basis for subsequently creating dummy components and adding constraints to the scraper arm components. Then, dummy components are sequentially created and constraints are added to the scraper arm components in the third assembly model, resulting in a fourth assembly model. This provides a basis for subsequently applying tension springs. Finally, tension spring values ​​are applied to the analysis events created in the fourth assembly model to obtain the corresponding displacement results of the scraper arm deformation.

[0016] Furthermore, the analysis method also includes: if the mesh quality in the assembly model after the mesh quality check is less than a preset mesh quality, performing mesh optimization on the mesh in the assembly model after the mesh quality check to obtain a mesh-optimized assembly model; and checking the mesh quality in the mesh-optimized assembly model until the mesh quality is greater than or equal to the preset mesh quality.

[0017] Based on the aforementioned technical methods, when the proportion of "Good" meshes in the assembly model after mesh quality checking is less than 90%, mesh optimization and mesh checking are performed sequentially on the meshes in the assembly model after mesh quality checking until the mesh quality is greater than or equal to the preset mesh quality. This reduces the impact of mesh quality on the assembly model.

[0018] Furthermore, the step of sequentially creating virtual components and adding constraints to the scraper arm component in the third assembly model to obtain the fourth assembly model includes: creating virtual components for the scraper arm component in the third assembly model to obtain the assembly model after creating virtual components; wherein, the virtual components include rigid virtual components, flexible spring virtual components, and flexible virtual components; adding constraints to the scraper arm component in the assembly model after creating virtual components to obtain the fourth assembly model; wherein, the constraints include clamping constraints and cylindrical clamping constraints.

[0019] Based on the above technical means, by creating a virtual component for the scraper arm component in the third assembly model, an assembly model with the virtual component is obtained. This simulates the scraper arm being scraped on the whole vehicle and the support state of the windshield. By adding constraints to the scraper arm component in the assembly model with the virtual component, a fourth assembly model is obtained, which provides a basis for applying tension spring force in the future.

[0020] Furthermore, the analysis method also includes: checking the connection relationship between the mesh, scraper material, and scraper component in the fourth assembly model to obtain the checked fourth assembly model; if the mesh cannot be divided in the checked fourth assembly model, adjusting the connection relationship between the scraper material and scraper component to obtain the adjusted fourth assembly model.

[0021] Based on the above methods, firstly, the connection relationships of the mesh, scraper material, and scraper components in the fourth assembly model are checked, which reduces the problem of errors in the subsequent mesh generation process. Then, if the mesh cannot be generated in the checked fourth assembly model, the connection relationships of the scraper material and scraper components are adjusted to obtain the adjusted fourth assembly model. This ensures the normal analysis of the scraper stiffness of the analysis events created in the assembly model.

[0022] An analysis device for the stiffness of a wiper arm, the analysis device comprising: The first determining module is used to determine the scraper arm lifting angle and the spring tension value when the scraper arm pressure and the spring tension are at extreme points; The constraint module is used to constrain the angle between the extension arm and the connector in the first assembly model based on the scraper arm lifting angle value, so as to obtain the second assembly model. An application module is used to apply the tension spring value to the analysis events created in the second assembly model respectively, and obtain the displacement result of the corresponding scraper arm deformation. The second determining module is used to determine whether the stiffness of the scraper arm meets the design requirements based on the displacement result of the scraper arm deformation.

[0023] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, performs some or all of the steps in the above-described method for analyzing the stiffness of the scraper arm.

[0024] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements some or all of the steps in the above-described method for analyzing the stiffness of the scraper arm.

[0025] The beneficial effects of this application are: (1) The wiper arm stiffness analysis method used in this application covers the wiper arm stiffness analysis for all analysis events.

[0026] (2) The wiper arm stiffness analysis method adopted in this application uses the displacement results of wiper arm deformation of all analysis events to determine whether the wiper arm stiffness meets the design requirements, thereby improving the accuracy of wiper arm stiffness analysis. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a scraper arm stiffness testing method in the prior art; Figure 2 A schematic diagram illustrating the implementation process of the method for analyzing the stiffness of a wiper arm proposed in this application; Figure 3 This is a schematic diagram of the lifting angle of the scraper arm and the flipping angle of the scraper brush during one working cycle as proposed in this application; Figure 4 This is a schematic diagram of the force distribution on a scraper arm proposed in this application; Figure 5 A schematic diagram of the scraper arm pressure and tension spring force during one working cycle as proposed in this application; Figure 6 This is a schematic diagram illustrating the assembly constraint of the angle between the extension arm and the connector according to the lifting angle value of the scraper arm, as proposed in this application. Figure 7-1 A schematic diagram illustrating the rigid virtual component of a connector proposed in this application; Figure 7-2 A schematic diagram illustrating the creation of a spring virtual component and a flexible virtual component proposed in this application; Figure 8 This is a schematic diagram illustrating the implementation process of another method for analyzing the stiffness of the wiper arm proposed in this application; Figure 9 This is a schematic diagram illustrating the implementation process of establishing an assembly model of the scraper arm and performing finite element analysis as proposed in this application. Figure 10 This is a schematic diagram illustrating a new material proposed in this application; Figure 11This is a schematic diagram of the mesh generation quality inspection results proposed in this application; Figure 12 This is a schematic diagram illustrating the application of a tension spring force according to this application; Figure 13 A schematic diagram illustrating an entity inspection proposed in this application; Figure 14 This is a schematic diagram of a connection check proposed in this application; Figure 15 This application presents a scraper arm displacement diagram when F+ is applied. Figure 16 This application presents a scraper arm displacement diagram when T+ is applied; Figure 17 This is a schematic diagram of the structural composition of a wiper arm stiffness analysis device proposed in this application; Figure 18 This is a schematic diagram of the hardware entity of a computer proposed in this application. Detailed Implementation

[0028] The embodiments of this application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be understood that the preferred embodiments are only for illustrating this application and are not intended to limit the scope of protection of this application.

[0029] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] To facilitate understanding of this application, the technical solution related to this application and its advantages and disadvantages will be briefly introduced below.

[0031] The existing method for testing the lateral stiffness of the scraper arm involves creating a hand-made prototype after the design data is completed, and then conducting experimental verification. For example... Figure 1As shown, the scraper arm stiffness includes the lateral stiffness and torsional stiffness of the scraper arm. The main steps of the scraper arm lateral stiffness test method are as follows: 1) Fix the mounting hole on the scraper arm connector 1 with a tool; 2) Set the height of the connector 2 in the working state on the whole vehicle; 3) Apply a load F+ to the side of the connector 2 at the end of the scraper arm and measure the offset displacement S1 of the connector 2; 4) Apply a load F- in the opposite direction and measure the offset displacement S2 of the connector 2; 5) Calculate the offset angle θ1=arctan(max(S1,S2) / L), where L is the distance from the end of the scraper arm to the center of the mounting hole of the connector 2; 6) Determine whether θ1 meets the design requirements. The main steps of the scraper arm torsional stiffness test method are as follows: 1) Fix the mounting hole on the scraper arm connector 1 with a tool; 2) Set the connector 2 at the working height on the whole vehicle; 3) Apply a load torque T+ to the side of the connector 2 at the end of the scraper arm and measure the offset angle θ1 of the connector 2; 4) Apply a load torque T- to the side of the connector 2 at the end of the scraper arm and measure the offset angle θ1 of the connector 2; 5) Determine whether θ1 meets the design requirements.

[0032] A prior art wiper arm stiffness testing device and method includes the following steps: 1) Fixing a mounting base according to the length and type of the wiper arm to be tested, then fixing the bottom end of the wiper arm to the mounting base with bolts, and then fixing the top end of the wiper arm to the corresponding mounting block with bolts; 2) Resetting the angle and displacement values ​​displayed on the controller to zero, and setting the magnitude of the push-pull force and torsional torque; 3) Starting the drive motor on the torsional stiffness testing unit and / or the push-pull stiffness testing unit to test the wiper arm to be tested; the drive motor in the torsional stiffness testing unit outputs a constant torque, driving the torsion shaft to rotate and thus rotating the wiper arm to be tested. The test involves rotating the wiper arm. When the angle stops changing, the direction of the drive motor is reversed until the angle stops changing again. The controller receives data from the angle sensor and generates a time-angle curve. In the push-pull stiffness test unit, the drive motor outputs a constant force to drive the push-pull shaft, which in turn moves the wiper arm under test. When the displacement stops changing, the direction of the drive motor is reversed until the displacement stops changing again. The controller receives data from the displacement sensor and generates a time-displacement curve. 4) Based on the measured data and curves, the sum of the maximum values ​​in both directions is calculated and compared with the evaluation value to determine whether the wiper arm stiffness meets the requirements. This test method is simple in process and provides accurate and intuitive results, allowing for a direct assessment of whether the stiffness meets the requirements. Its main drawbacks are: 1) The specified test specimen state is singular; no wiper arm stiffness analysis is performed under different wiper arm pressures or at different positions on the vehicle. 2) If the test fails, the design must be modified, and a new manual sample must be made for testing, incurring significant time and cost and a long cycle.

[0033] An existing method for optimizing vehicle frame stiffness involves setting a range for frame parameters, target values ​​for bending stiffness and torsional stiffness, selecting frame parameter values ​​within the range, establishing a three-dimensional model and performing mesh generation, determining boundary conditions, calculating bending stiffness and torsional stiffness values, and outputting frame parameter values ​​when both bending stiffness and torsional stiffness meet design requirements (i.e., bending stiffness is not less than the target bending stiffness value and torsional stiffness is not less than the target torsional stiffness value). This yields frame parameter values ​​that meet the design requirements.

[0034] An existing method for analyzing the stiffness of a stabilizer bar link includes the following steps: 1) Obtaining the stabilizer bar link; the operator inputs the obtained stabilizer bar link into finite element analysis software; 2) The operator cleans and simplifies the geometric features on the stabilizer bar link that have little impact on the stabilizer bar link within the finite element analysis software. Using finite element analysis software, drawing software, and processing software, the drawing software creates a stabilizer bar link diagram, and the finite element analysis software sets the material properties, flatness, and stress points of the discretized stabilizer bar link model. The subsequent processing software calculates the stiffness value of the stabilizer bar link model. After comparing the stiffness value with a standard, mass production is carried out, reducing the analysis cost of the stabilizer bar link. This method optimizes weak components in the chassis system during automotive development, saving development time and improving vehicle performance.

[0035] Based on this, this embodiment proposes a method for analyzing the stiffness of the wiper arm, referring to... Figure 2 The analysis method may include the following steps S101 to S104, wherein: Step S101: Determine the scraper arm lifting angle and spring tension value when the scraper arm pressure and spring tension are at their extreme points; Here, the scraper arm lifting angle value refers to the scraper arm lifting angle corresponding to the scraper arm pressure value when the scraper arm pressure is at its maximum value; the tension spring force value refers to the tension spring force when the tension spring force is at its minimum value.

[0036] In some embodiments, the implementation of step S101, "determining the scraper arm lifting angle and the spring tension when the scraper arm pressure and the spring tension are at their extreme points," includes the following steps S1011 to S1013: Step S1011: Obtain the first variation curve of the scraper arm pressure versus time, and the second variation curve of the tension spring force versus time; In some embodiments, the implementation of step S1011, "obtaining the first variation curve of the scraper arm pressure versus time and the second variation curve of the tension spring force versus time," includes the following steps S111 to S113: Step S111: Obtain the lifting angle of the wiper arm and the flipping angle of the wiper in one working cycle; During implementation, the wiper arm lifting angle within one working cycle is output through the wiper motion model. and the angle of the scraper ,like Figure 3 As shown, scraper arm lifting angle The angle of the scraper rotation corresponds one-to-one with time t. It also has a one-to-one correspondence with time t.

[0037] Step S112: Input the wiper arm lifting angle and the wiper brush flipping angle of the wiper in one working cycle into the model equation of the wiper arm pressure to obtain the first change curve of wiper arm pressure versus time. Here, the model equation for scraper arm pressure is determined by the equilibrium equation established using the components consisting of connector, connecting rod, extension arm, and rivet as the analysis object.

[0038] In implementation, such as Figure 4 As shown, point P is the point of action of the scraper support connector, point A is the contact point between the tension spring and the connecting rod, point O is the rivet axis, and point B is the pin axis. Taking the assembly consisting of the connector, connecting rod, extension arm, and rivet as the analysis object, the established equilibrium equation is the following formula (1): (1); where, ,

[0039] This indicates the distance between the rivet axis and the contact point between the tension spring and the connecting rod, in meters (m). This indicates the distance between the rivet axis and the pin axis, expressed in meters (m). This indicates the distance between the rivet axis and the point of action of the connector, in meters (m). This indicates the distance between the contact point of the tension spring and the connecting rod and the center of the pin shaft, in meters (m). The tension of the spring is expressed in Newtons (N). The pressure of the scraper arm is equal to the supporting force of the scraper brush on the scraper arm, and the unit is Newton (N). The stiffness of the tension spring is expressed in N / mm, with a tolerance.

[0040] This is the sum of the lengths of the tension spring and the hook spring in their natural state, expressed in millimeters (mm). Let be the rotation angle of the scraper at time t; Indicates the installation location on the vehicle. The angle between the OP normal and the OP normal. Let be the angle of rise and fall of OP at time t; This indicates the angle between OP and OB when the vehicle is installed in the correct position. and All of these are initial values, which can be fixed values ​​set manually. Indicates the angle between the tension spring and OB; Determine the scraper arm pressure using formula (1) The model equation is given by the following formula (2): (2); During implementation, the wiper arm lifting angle and wiper blade flipping angle within one working cycle are input into the model equation for wiper arm pressure, resulting in the first curve of wiper arm pressure versus time, as shown below. Figure 5 The curve in the figure is shown.

[0041] Step S113: Input the lifting angle of the wiper arm and the flipping angle of the wiper in one working cycle into the model equation of the tension spring force to obtain the second variation curve of the tension spring force versus time; Here, the model equation for the tension spring force is determined by the equilibrium equation established using the components consisting of connectors, connecting rods, extension arms, and rivets as the analysis objects.

[0042] In practice, the tension of the tension spring is determined using formula (1). The model equation is given by the following formula (3): (3); During implementation, the wiper arm lifting angle and wiper blade flipping angle within one working cycle are input into the model equation of the tension spring force, resulting in a second curve showing the change in tension spring force over time, as shown below. Figure 5 The dashed curve in the figure is shown.

[0043] In this embodiment, firstly, the wiper arm lifting angle and the wiper brush flipping angle are obtained within one working cycle. This provides a basis for subsequently determining the first variation curve of wiper arm pressure versus time and the second variation curve of spring tension versus time. Then, the wiper arm lifting angle and the wiper brush flipping angle within one working cycle are input into the model equation of wiper arm pressure to determine the first variation curve of wiper arm pressure versus time. Finally, the wiper arm lifting angle and the wiper brush flipping angle within one working cycle are input into the model equation of spring tension to determine the second variation curve of spring tension versus time.

[0044] Step S1012: Based on the first change curve, determine the scraper arm pressure value when the scraper arm pressure is at its maximum value, so as to determine the scraper arm lifting angle value. During implementation, the scraper pressure value at its maximum value is determined by the first change curve of scraper pressure versus time. Since the first change curve of scraper pressure versus time is obtained by substituting the scraper lifting angle and the scraper brush flipping angle into formula (2), the scraper lifting angle value is also determined after determining the scraper pressure value at its maximum value.

[0045] Step S1013: Based on the second variation curve, determine the tension value of the tension spring when the tension spring is at its minimum value.

[0046] During implementation, the spring tension value at its minimum is determined by using the second curve showing the change in spring tension over time.

[0047] In this embodiment, firstly, a first curve showing the change in scraper arm pressure versus time and a second curve showing the change in tension spring force versus time are obtained. This provides a basis for subsequently determining the scraper arm pressure value when the scraper arm pressure is at its maximum and the tension spring force value when the tension spring force is at its minimum. Then, the scraper arm pressure value when the scraper arm pressure is at its maximum is determined using the first curve showing the change in scraper arm pressure versus time, thereby determining the scraper arm lifting angle value. Finally, the tension spring force value when the tension spring force is at its minimum is determined using the second curve showing the change in tension spring force versus time.

[0048] Step S102: Based on the scraper arm lifting angle value, perform assembly constraints on the angle between the extension arm and the connector in the created first assembly model to obtain the second assembly model. Here, the first assembly model is the model obtained by adding assembly constraints to the connector, connecting rod, extension arm, rivet, bushing, and connector of the scraper arm according to the positional relationship of the actual vehicle assembly state.

[0049] In implementation, such as Figure 6 As shown, the angle between the extension arm and the connector in the first assembly model is constrained according to the lifting angle value of the scraper arm to obtain the second assembly model.

[0050] Step S103: Apply the tension spring value to the analysis events created in the second assembly model to obtain the displacement results of the corresponding scraper arm deformation. Here, the analysis events created include the following four analysis events: applying positive force, negative force, positive torque, and negative torque to both sides of the connector respectively; the displacement result of the scraper arm deformation refers to the displacement value of the scraper arm deformation from the start of applying the tension spring force value to the stop of applying the tension spring force value for each analysis event.

[0051] During implementation, the tension spring values ​​are applied to the four analysis events created in the second assembly model to obtain the displacement results of the scraper arm deformation for the four analysis events.

[0052] In some embodiments, the implementation of step S103, "applying the tension spring value to the analysis events created in the second assembly model respectively to obtain the displacement result of the corresponding scraper arm deformation", includes the following steps S1031 to S1035: Step S1031: Use the finite element analysis module to mesh the second assembly model to obtain the meshed assembly model; Here, the finite element analysis module can be a computer-aided three-dimensional interactive application (CATIA).

[0053] During implementation, a computer-aided 3D interactive application is used to automatically generate a second assembly model for mesh generation, resulting in a meshed assembly model.

[0054] Step S1032: Perform a mesh quality check on the meshed assembly model to obtain the mesh quality-checked assembly model. During implementation, advanced mesh analysis tools are used to perform mesh quality checks on the meshed assembly model, resulting in a mesh quality-checked assembly model. This allows us to determine whether the mesh quality in the mesh quality-checked assembly model meets the requirements.

[0055] Step S1033: If the mesh quality in the assembly model after the mesh quality check is greater than the preset mesh quality, the connection relationship and connection characteristics of the scraper arm component are created sequentially to obtain the third assembly model. Here, the preset mesh quality is Good with 90% of the meshes being Good.

[0056] During implementation, when the mesh quality in the assembly model after mesh quality inspection is greater than Good by 90%, general connection relationships are established for connectors and connecting rods, connecting rods and extension arms, extension arms and rivets, rivets and bushings, bushings and connectors, extension arms and connectors, and pins and connectors. Then, based on these general connection relationships, the connection characteristics between scraper arm components are established.

[0057] Step S1034: Create virtual parts and add constraints to the scraper arm component in the third assembly model in sequence to obtain the fourth assembly model; Here, virtual components include rigid virtual components, flexible spring virtual components, and flexible virtual components. For example, a rigid virtual component is created on the connector to simulate the scraper arm being scraped across the vehicle and the windshield's support state; flexible spring virtual components and flexible virtual components are created between the pin and the connecting rod. The flexible spring virtual component replaces the scraper arm spring and hook spring, and the flexible virtual component is used to apply tension spring force later. Constraints include clamping constraints and cylindrical hinge constraints.

[0058] In some embodiments, the implementation of step S1034, "to sequentially create dummy parts and add constraints to the scraper arm component in the third assembly model to obtain the fourth assembly model," includes the following steps S131 and S132: Step S131: Create a virtual component for the scraper arm component in the third assembly model to obtain the assembly model after creating the virtual component; In implementation, the method for creating rigid dummy elements on the connector is as follows: Figure 7-1 As shown, point P1 is created in the connector. Point P1 is the support point of the scraper arm. Then, a rigid dummy element is created with the upper inner wall of the connector as the support and point P1 as the operating point. The method for creating a flexible spring dummy element between the pin and the connecting rod is as follows: Figure 7-2 As shown, the contact surface between the connecting rod and the tension spring is used as the support element, point P3 is used as the operating point of the spring dummy, and the axis system is a custom axis system. The tension spring stiffness value is set to k in the X-axis direction. This flexible spring dummy is used to simulate the change in spring tension. The method for creating a flexible dummy between the pin and the connecting rod is as follows: Figure 7-2 As shown, the contact surface between the connecting rod and the tension spring is used as the support element. In the same way, the support element is the arc surface on the connecting rod. Point P3 is used as the operation point to create a flexible virtual element between the pin and the connecting rod. This flexible virtual element is used to apply the tension spring force later.

[0059] Step S132: Add constraints to the scraper arm component in the assembly model after the virtual component is created to obtain the fourth assembly model; A clamping constraint is applied to the mounting hole on the scraper connector, and the clamping constraint support element is the inner surface of the mounting hole on the connector head; the support elements of the cylindrical hinge constraint are a flexible spring virtual element and a flexible virtual element, respectively.

[0060] In this embodiment, by creating a virtual component for the scraper arm part in the third assembly model, an assembly model with the virtual component is obtained, thus simulating the scraper arm being scraped on the whole vehicle and the support state of the windshield; by adding constraints to the scraper arm part in the assembly model with the virtual component, a fourth assembly model is obtained, thus providing a basis for applying tension spring force in the future.

[0061] Step S1035: Apply the tension spring value to the analysis event created by the fourth assembly model to obtain the displacement result of the corresponding scraper arm deformation.

[0062] In implementation, such as Figure 7-2 As shown, with the flexible virtual component created between the pin and the connecting rod as support, and the shaft system as a custom shaft system, in the X-axis direction, the tension spring force value is applied to the analysis event created by the fourth assembly model to obtain the displacement result of the corresponding scraper arm deformation.

[0063] In this embodiment, firstly, the second assembly model is meshed using the finite element analysis module to obtain a meshed assembly model. This allows for simultaneous assembly model design and finite element analysis, thereby improving design efficiency. Secondly, the meshed assembly model undergoes a mesh quality check, resulting in a mesh-quality-checked assembly model. If the mesh quality check fails to meet the requirement of a Good percentage greater than 90%, the mesh is optimized to reduce the impact of mesh quality on the assembly model. Thirdly, if the mesh quality in the mesh-quality-checked assembly model exceeds a preset mesh quality, the connection relationships and connection characteristics of the scraper arm components are sequentially created to obtain a third assembly model. This provides a basis for subsequently creating dummy components and adding constraints to the scraper arm components. Then, dummy components are sequentially created and constraints are added to the scraper arm components in the third assembly model to obtain a fourth assembly model. This provides a basis for subsequently applying tension spring forces. Finally, tension spring force values ​​are applied to the analysis events created in the fourth assembly model to obtain the corresponding displacement results of the scraper arm deformation.

[0064] Step S104: Based on the displacement results of the scraper arm deformation, determine whether the stiffness of the scraper arm meets the design requirements.

[0065] In this embodiment, firstly, the scraper arm lifting angle and tension spring force values ​​are determined when the scraper arm pressure and tension spring force are at their extreme points. This provides a basis for subsequent assembly constraints between the extension arm and connector in the assembly model based on the scraper arm lifting angle and for applying tension spring force to the analysis events. Secondly, based on the scraper arm lifting angle values, assembly constraints are applied to the angle between the extension arm and connector in the first assembly model to obtain the second assembly model. This achieves assembly constraints between the extension arm and connector in the assembly model based on the scraper arm lifting angle. Then, tension spring force values ​​are applied to the analysis events created in the second assembly model to obtain the corresponding scraper arm deformation displacement results. This achieves scraper arm stiffness analysis for the analysis events created in the assembly model. Finally, based on the scraper arm deformation displacement results, it is determined whether the scraper arm stiffness meets the design requirements, thus improving the accuracy of the scraper arm stiffness analysis.

[0066] The beneficial effects of this application are as follows: (1) The wiper arm stiffness analysis method used in this application covers the wiper arm stiffness analysis of all analysis events. (2) The wiper arm stiffness analysis method used in this application uses the displacement results of the wiper arm deformation of all analysis events to determine whether the wiper arm stiffness meets the design requirements, thereby improving the accuracy of the wiper arm stiffness analysis.

[0067] In some embodiments, the implementation of step S104, "determining whether the stiffness of the scraper arm meets the design requirements based on the displacement result of the scraper arm deformation," includes the following steps S1041 and S1042: Step S1041: Analyze the displacement diagram corresponding to the displacement result of the scraper arm deformation to obtain the displacement change value of the scraper arm end. During implementation, the displacement results of the scraper arm deformation are visualized to obtain the corresponding displacement diagram. The displacement diagram is then analyzed to obtain the displacement change value at the end of the scraper arm.

[0068] In some embodiments, the created analysis events include the following four analysis events: applying a positive force, a negative force, a positive torque, and a negative torque to both sides of the connector respectively; the implementation of step S1041, "analyzing the displacement diagram corresponding to the displacement result of the scraper arm deformation to obtain the displacement change value at the end of the scraper arm," includes the following steps S141 and S142: Step S141: Visualize the displacement results of the scraper arm deformation corresponding to each analysis event to obtain the displacement diagram of the scraper arm for each analysis event. During implementation, the displacement results of the scraper arm deformation corresponding to each analysis event are visualized to obtain the displacement map of the scraper arm for each analysis event. By analyzing the displacement map of the scraper arm, the displacement change value at the end of the scraper arm can be determined.

[0069] Step S142: Analyze the displacement diagram of the scraper arm for each of the analysis events to obtain the displacement change value of the scraper arm end for each of the analysis events.

[0070] During implementation, the displacement diagram of the scraper arm for each analysis event is analyzed to obtain the displacement change value of the scraper arm end for each analysis event, so as to determine whether the scraper arm stiffness meets the design requirements by using the displacement change value of the scraper arm end.

[0071] In this embodiment, the displacement results of the scraper arm deformation corresponding to each analysis event are visualized, and the displacement diagram of the scraper arm after visualization for each analysis event is analyzed to obtain the displacement change value of the scraper arm end for each analysis event. In this way, users can intuitively see the displacement change value of the scraper arm end for each analysis event through the scraper arm displacement diagram.

[0072] Step S1042: Based on the displacement change value at the end of the scraper arm, determine whether the stiffness of the scraper arm meets the design requirements.

[0073] In this embodiment, by analyzing the displacement diagram corresponding to the deformation of the scraper arm, the displacement change value at the end of the scraper arm obtained after analysis is used to determine whether the stiffness of the scraper arm meets the design requirements. This allows users to intuitively see the displacement change value at the end of the scraper arm through the displacement diagram, and thus determine whether the stiffness of the scraper arm meets the design requirements based on the displacement change value at the end of the scraper arm.

[0074] In some embodiments, the analysis method further includes the following steps S151 and S152: Step S151: If the mesh quality in the assembly model after the mesh quality check is less than the preset mesh quality, perform mesh optimization on the mesh in the assembly model after the mesh quality check to obtain a mesh-optimized assembly model. Here, mesh optimization improves the mesh generation quality by adjusting global and local parameters, and re-meshes the mesh for key parts of the scraper arm component. For example, stress concentrations may exist at rivets, bushings, contact holes of connectors and bushings, contact surfaces of connectors and extension arms, and rivet holes of extension arms and rivets. Therefore, the mesh size is locally adjusted to 0.5 mm.

[0075] Step S152: Check the mesh quality in the mesh-optimized assembly model until the mesh quality is greater than or equal to the preset mesh quality.

[0076] In this embodiment, if the proportion of "Good" meshes in the assembly model after mesh quality checking is less than 90%, the meshes in the assembly model after mesh quality checking are sequentially optimized and checked until the mesh quality is greater than or equal to a preset mesh quality. This reduces the impact of mesh quality on the assembly model.

[0077] In some embodiments, the analysis method further includes the following steps S161 and S162: Step S161: Check the connection relationship between the mesh, scraper material and scraper component in the fourth assembly model to obtain the checked fourth assembly model. During implementation, the model inspection function is used to check the connection relationship between the mesh, scraper material and scraper components in the fourth assembly model, and the fourth assembly model after inspection is obtained.

[0078] Step S162: If the mesh cannot be divided in the fourth assembly model after inspection, the connection relationship between the scraper arm material and the scraper arm component is adjusted to obtain the adjusted fourth assembly model.

[0079] In this embodiment, firstly, the connection relationships of the mesh, scraper material, and scraper components in the fourth assembly model are checked, thus reducing errors in the subsequent mesh generation process. Then, if the mesh in the checked fourth assembly model cannot be generated, the connection relationships of the scraper material and scraper components are adjusted to obtain the adjusted fourth assembly model. This ensures the normal analysis of the scraper stiffness of the analysis events created in the assembly model.

[0080] To achieve optimal design and analysis of wiper arm stiffness, this embodiment proposes an alternative method for analyzing wiper arm stiffness. This method determines the working position and state parameters of the wiper arm when the wiper arm pressure and tension spring force reach their extreme points. Then, using CATIA's finite element analysis module, it analyzes whether the wiper arm stiffness meets the design requirements. This method covers wiper arm stiffness analysis for all analysis events. By using the finite element analysis module to analyze whether the wiper arm stiffness meets the design requirements, wiper arm stiffness design and finite element analysis can be performed simultaneously, thereby improving design efficiency, shortening the design cycle, and reducing development costs.

[0081] This application provides a method for analyzing the stiffness of a wiper arm, such as... Figure 8 As shown, the analytical method includes the following steps: Step S1: Convert the scraper arm stiffness requirement into the scraper arm displacement requirement; Lateral displacement requirements for scraper arm:

[0082] Scraper arm torsional displacement requirements:

[0083] In the formula: The displacement of the scraper arm end when a positive load F is applied to the scraper arm end, in millimeters (mm). The displacement at the end of the scraper arm when a reverse load F is applied, in mm; L is the distance from the end of the scraper arm to the center of the mounting hole of connector 1, in mm; The angle requirement for the lateral stiffness of the scraper arm is expressed in degrees. The height difference between the two sides of the connector when a positive torque T is applied to the side of the connector 2 at the end of the scraper arm is expressed in mm. The height difference between the two sides of the connector when a reverse torque T is applied to the side of the connector 2 at the end of the scraper arm, in mm; D represents the width of the scraper arm connector, in mm; The angle requirement for the torsional stiffness of the scraper arm is expressed in degrees. Step S2: Establish the model equations for the scraper arm pressure and the tension spring force; Specifically, such as Figure 4 As shown, point P is the point of action of the scraper support connector, point A is the contact point between the tension spring and the connecting rod, point O is the rivet axis, and point B is the pin axis. Taking the assembly consisting of the connector, connecting rod, extension arm, and rivet as the analysis object, the equilibrium equation is established as follows: (1); Determine the scraper arm pressure using formula (1). Tension of the tension spring Model equations: scraper arm pressure Model equations: (2); tension spring Model equations: (3); Step S3: Obtain the wiper arm lifting angle during one working cycle. and the angle of the scraper ; Based on the wiper motion model, output the wiper arm lifting angle during one working cycle. And the angle of the scraper rotation, such as Figure 3 As shown, scraper arm lifting angle and the angle of the scraper It has a one-to-one correspondence with time t.

[0084] Step S4: Determine the scraper arm pressure within one work cycle. and tension of the tension spring A graph of the curve versus time t; The wiper arm height adjustment angle during one work cycle and the angle of the scraper Substituting into formulas (2) and (3), we get the following: Figure 5 The scraper arm pressure shown in one working cycle and tension of the tension spring A graph of the curve versus time t.

[0085] Step S5: Determine the scraper arm lifting angle and spring tension value when the scraper arm pressure and spring tension are at their extreme points; Based on the scraper arm pressure within a work cycle and tension of the tension spring By plotting the curves against time t, we can determine the times when the scraper arm pressure and tension spring force reach their extreme points, as well as the corresponding scraper arm lifting angle at those extreme points. and the angle of the scraper rotation Thus, the lifting angle of the scraper arm and the tension of the spring at the extreme point are obtained.

[0086] Step S6: Establish the assembly model of the scraper arm and perform finite element analysis. The analysis steps are as follows: Figure 9 As shown, the specific steps are as follows: Step S601: Create and simplify the assembly model of the scraper arm; Assembly constraints are added to the connectors, connecting rods, extension arms, rivets, bushings, and connecting heads of the scraper arm according to their positional relationships in the actual vehicle assembly state. The tension spring and hook spring are simplified and replaced with flexible virtual parts and spring virtual parts to transmit the spring tension. For example... Figure 6 As shown, the angle between the extension arm and the connector is based on the scraper arm lifting angle. The corners are used for assembly constraints.

[0087] Step S602: Preprocess the assembly model of the scraper arm; The scraper arm parts are processed in detail and materials are added. Part features that do not affect the analysis results but have a significant impact on the mesh generation quality are deleted or modified. A material library is defined based on the actual material application of the project.

[0088] Specifically, in this embodiment, the limiting flange and small rounded corners on the connector, and the limiting boss on the scraper arm, do not affect the analysis results, but require finer meshing. The small rounded corners on the connector are processed into right angles, and the limiting flange and limiting boss on the extension arm are cut off.

[0089] The method for adding scraper arm material is as follows: Open the CATIA material library, create a new custom material, name it aluminum alloy, and set the mechanical properties such as Young's modulus, Poisson's ratio, and yield strength as follows. Figure 10 As shown, the scraper arm connector is then made of aluminum alloy. The remaining parts are made of steel. It should be noted that if other special materials are not in the material library, custom materials can be created and added to the scraper arm model using the same method.

[0090] Step S603: Mesh the assembly model of the scraper arm; Switch to the CATIA finite element analysis module, and the software will automatically mesh the assembly model of the scraper arm.

[0091] Step S604: Determine if the mesh quality satisfies the requirement that the proportion of Good is greater than 90%; if the mesh quality satisfies the requirement that the proportion of Good is greater than 90%, then proceed to step S605; if the mesh quality does not satisfy the requirement that the proportion of Good is greater than 90%, then optimize the mesh.

[0092] To check the mesh quality, switch to the advanced mesh analysis tool, select mesh quality analysis, and determine whether the mesh quality meets the requirements of Good percentage being greater than 90% and Bad percentage being 0%.

[0093] Mesh optimization improves mesh quality by adjusting global and local parameters, and re-meshes the mesh for critical parts of components. Specifically, stress concentrations may exist at rivets, bushings, connectors and bushing contact holes, connector and extension arm contact surfaces, and extension arms and rivet riveting holes. The mesh size is adjusted locally to 0.5mm. The mesh quality check results are as follows: Figure 11 As shown.

[0094] Step S605: Create the connection relationship of the scraper arm components; The connection relationships of the scraper arm components are used as support elements subsequently created as connection characteristics.

[0095] Specifically, in the engineering analysis module, select the general connection relationship and establish general connection relationships for connector and connecting rod, connecting rod and extension arm, extension arm and rivet, rivet and bushing, bushing and connector, extension arm and connector, and pin and connector.

[0096] Step S606: Create the connection characteristics of the scraper arm component; Based on the connection relationships, the connection characteristics of each component of the scraper arm are established. The connection characteristics between each component of the scraper arm are shown in the table below.

[0097] Components connector Connecting rod extension arm rivet bushing plug connector connector Connecting rod Fasten connection extension arm Fasten connection rivet Contact connection, fastening connection bushing Contact connection plug Flexible spring virtual component connector Contact connection Fasten connection Fasten connection Step S607: Create a virtual component; Create a rigid dummy component on the connector to simulate the scraper arm being scraped across the vehicle and supported by the windshield. Create a flexible spring dummy component and a flexible dummy component between the pin and the connecting rod. The flexible spring dummy component replaces the scraper arm spring and the hook spring, and adds a spring stiffness k. The flexible dummy component is used to apply tension spring force later.

[0098] Specifically, the method for creating rigid virtual components on a connector is as follows: Figure 7-1 As shown, point P1 is created in the connector. Point P1 is the support point of the scraper on the scraper arm. Then, a rigid dummy part is created with the upper inner wall of the connector as the support and point P1 as the operation point.

[0099] like Figure 7-2 As shown, create point P2 in the connecting rod component. Point P2 is the center point of the contact surface between the connecting rod and the tension spring. Create point P3 in the pin component axis. Point P3 is the intersection of the tension spring's rotation plane and the pin axis. Connect points P2 and P3 with line L1, which represents the direction of the tension force when the spring is working. Create an axis system with point P3 as the origin, the pin axis as the Y-axis, and line L1 as the X-axis.

[0100] Specifically, the method for creating a flexible spring virtual element between the pin and the connecting rod: such as Figure 7-2 As shown, the contact surface between the connecting rod and the tension spring is used as the support element, point P3 is used as the operating point of the spring virtual component, the axis system is used as a custom axis system, and the tension spring stiffness value is set to k in the X-axis direction. This flexible spring virtual component is used to simulate the change of spring tension.

[0101] Specifically, the method for creating a flexible virtual element between the pin and the connecting rod is as follows: using the contact surface between the connecting rod and the tension spring as the support element, and point P3 as the operation point, a flexible virtual element is created between the pin and the connecting rod. This flexible virtual element is used to apply the tension spring force subsequently.

[0102] Step S608, add constraints; The constraints include: clamping constraint scraper arm connector mounting hole and cylindrical constraint spring virtual component.

[0103] Specifically, a clamping constraint is applied to the mounting hole on the scraper arm connector, and the clamping constraint support element is the inner surface of the mounting hole on the connector; there are two cylindrical hinge constraints, and the support elements of the cylindrical hinge constraints are the flexible spring virtual element and the flexible virtual element created in step S607, respectively, and the axis system is a custom axis system with the release direction being the Y-axis.

[0104] Step S609: Apply tension to the tension spring; Specifically, create four analysis events, applying a positive force F+, a negative force F-, a positive torque T-, and a negative torque T- to both sides of the connector, respectively, and applying a tension spring force in each analysis event; for example... Figure 12 As shown, select the uniform force tool, use the flexible virtual component created in step S606 as support, and set the axis system to a custom axis system. Apply a tension spring force in the X-axis direction.

[0105] Step S610: Inspect the assembly model of the scraper arm; Use the model check function to check the defined materials, meshes, connection properties, etc.

[0106] Step S611: Determine whether the mesh in the assembly model can be divided; if the mesh in the assembly model can be divided, proceed to step S612; if the mesh in the assembly model cannot be divided, optimize the assembly model. If the mesh cannot be divided in the inspected assembly model, the assembly model is optimized. Specifically, the connection relationship between the scraper arm material and the scraper arm components is adjusted.

[0107] like Figure 13 As shown, the entity check examines all meshed elements, as well as material characteristics, element properties, and other attributes.

[0108] like Figure 14As shown, the connection check examines all connections, including missing mesh parts, element properties, materials, unmeshed geometry, and duplicated mesh properties.

[0109] Step S612: Analyze the displacement diagram corresponding to the displacement result of the scraper arm deformation.

[0110] The displacement results of the scraper arm deformation are visualized. For each analysis event, a displacement graph is displayed. The displacement graphs are analyzed to determine the displacement change value at the end of the scraper arm and to judge whether the displacement meets the requirements in step S1. The displacement graph when F+ is applied is shown below. Figure 15 As shown. The displacement diagram at T+ is as follows. Figure 16 As shown.

[0111] Based on the foregoing embodiments, this embodiment provides a device for analyzing the stiffness of the wiper arm, such as... Figure 17 As shown, the analysis device 1700 includes: a first determining module 1710, used to determine the scraper arm lifting angle and the spring tension value when the scraper arm pressure and the spring tension are at extreme points; a constraint module 1720, used to perform assembly constraints on the angle between the extension arm and the connector in the created first assembly model based on the scraper arm lifting angle value, to obtain a second assembly model; an applying module 1730, used to apply the spring tension value to the analysis events created in the second assembly model respectively, to obtain the displacement result of the corresponding scraper arm deformation; and a second determining module 1740, used to determine whether the scraper arm stiffness meets the design requirements based on the displacement result of the scraper arm deformation.

[0112] In this embodiment, the second determining module includes: an analysis submodule, used to analyze the displacement diagram corresponding to the displacement result of the scraper arm deformation to obtain the displacement change value at the end of the scraper arm; and a first determining submodule, used to determine whether the stiffness of the scraper arm meets the design requirements based on the displacement change value at the end of the scraper arm.

[0113] In this embodiment, the created analysis events include the following four analysis events: applying a positive force, a negative force, a positive torque, and a negative torque to both sides of the connector respectively. The analysis submodule includes: a processing unit, used to visualize the displacement result of the scraper arm deformation corresponding to each analysis event to obtain the displacement map of the scraper arm for each analysis event; and an analysis unit, used to analyze the displacement map of the scraper arm for each analysis event to obtain the displacement change value of the scraper arm end for each analysis event.

[0114] In this embodiment, the first determining module includes: an acquisition submodule, used to acquire a first variation curve of the scraper arm pressure versus time and a second variation curve of the tension spring force versus time; a second determining submodule, used to determine the scraper arm pressure value when the scraper arm pressure is at its maximum value based on the first variation curve, so as to determine the scraper arm lifting angle value; and a third determining submodule, used to determine the tension spring force value when the tension spring force is at its minimum value based on the second variation curve.

[0115] In this embodiment, the acquisition submodule includes: an acquisition unit, used to acquire the wiper arm lifting angle and the wiper brush flipping angle of the wiper in one working cycle; a first input unit, used to input the wiper arm lifting angle and the wiper brush flipping angle of the wiper in one working cycle into the model equation of wiper arm pressure to obtain a first curve of wiper arm pressure versus time; and a second input unit, used to input the wiper arm lifting angle and the wiper brush flipping angle of the wiper in one working cycle into the model equation of spring tension to obtain a second curve of spring tension versus time. In this embodiment, the application module includes: a meshing submodule, used to perform meshing on the second assembly model using a finite element analysis module to obtain a meshed assembly model; an inspection submodule, used to perform mesh quality checks on the meshed assembly model to obtain a mesh-quality-checked assembly model; a first creation submodule, used to sequentially create connection relationships and connection characteristics of the scraper arm components to obtain a third assembly model when the mesh quality in the mesh-quality-checked assembly model is greater than a preset mesh quality; a second creation submodule, used to sequentially create dummy parts and add constraints to the scraper arm components in the third assembly model to obtain a fourth assembly model; and an application submodule, used to apply the tension spring value to the analysis events created in the fourth assembly model to obtain the displacement results of the corresponding scraper arm deformation.

[0116] In this embodiment, the wiper arm stiffness analysis device further includes: an optimization module, used to optimize the mesh in the assembly model after the mesh quality check is less than a preset mesh quality, to obtain a mesh-optimized assembly model; and a first inspection module, used to inspect the mesh quality in the mesh-optimized assembly model until the mesh quality is greater than or equal to the preset mesh quality.

[0117] In this embodiment, the second creation submodule includes: a creation unit, used to create virtual parts for the scraper arm component in the third assembly model to obtain an assembly model after the virtual parts are created; wherein, the virtual parts include rigid virtual parts, flexible spring virtual parts, and flexible virtual parts; and an adding unit, used to add constraints to the scraper arm component in the assembly model after the virtual parts are created to obtain a fourth assembly model; wherein, the constraints include clamping constraints and cylindrical constraints.

[0118] In this embodiment, the wiper arm stiffness analysis device further includes: a second inspection module, used to inspect the connection relationship between the mesh, wiper arm material and wiper arm component in the fourth assembly model, to obtain the inspected fourth assembly model; and an adjustment module, used to adjust the connection relationship between the wiper arm material and wiper arm component when the mesh cannot be divided in the inspected fourth assembly model, to obtain the adjusted fourth assembly model.

[0119] This embodiment also proposes a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement some or all of the steps in the above method.

[0120] This embodiment also proposes a computer-readable storage medium storing a computer program that, when executed by a processor, implements some or all of the steps in the above-described method. The computer-readable storage medium can be transient or non-transient.

[0121] This embodiment also proposes a computer program including computer-readable code, wherein when the computer-readable code is run in a computer device, a processor in the computer device performs some or all of the steps for implementing the above-described method.

[0122] This embodiment also proposes a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program. When the computer program is read and executed by a computer, it implements some or all of the steps in the above-described method. This computer program product can be implemented specifically through hardware, software, or a combination thereof. In some embodiments, the computer program product is specifically embodied as a computer storage medium; in other embodiments, the computer program product is specifically embodied as a software product, such as a software development kit (SDK), etc.

[0123] It should be noted that the descriptions of the various embodiments above tend to emphasize the differences between them, while their similarities or commonalities can be referred to interchangeably. The descriptions of the above embodiments of the device, storage medium, computer program, and computer program product are similar to the descriptions of the above method embodiments and have similar beneficial effects. For technical details not disclosed in the embodiments of the device, storage medium, computer program, and computer program product of this application, please refer to the descriptions of the method embodiments of this application for understanding.

[0124] It should be noted that, Figure 18 This is a schematic diagram of a hardware entity of a computer device in an embodiment of this application, such as... Figure 18 As shown, the hardware entity of the computer device 1800 includes: a processor 1801, a communication interface 1802, and a memory 1803, wherein: Processor 1801 typically controls the overall operation of computer device 1800.

[0125] Communication interface 1802 enables computer devices to communicate with other terminals or servers over a network.

[0126] The memory 1803 is configured to store instructions and applications executable by the processor 1801, and can also cache data to be processed or already processed (e.g., image data, audio data, voice communication data, and video communication data) in the processor 1801 and various modules in the computer device 1800. It can be implemented using flash memory or random access memory (RAM). Data transfer between the processor 1801, the communication interface 1802, and the memory 1803 can be performed via bus 1804.

[0127] The above embodiments are merely preferred embodiments provided to fully illustrate this application, and the scope of protection of this application is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on this application are all within the scope of protection of this application.

Claims

1. A method for analyzing the stiffness of a wiper arm, characterized in that, The analytical method includes: Determine the scraper arm lifting angle and spring tension value when the scraper arm pressure and spring tension are at their extreme points; Based on the scraper arm lifting angle value, the angle between the extension arm and the connector in the first assembly model is constrained to obtain the second assembly model; the first assembly model is the model obtained by adding assembly constraints to the connector, connecting rod, extension arm, rivet, bushing and connector of the scraper arm according to the positional relationship of the actual vehicle assembly state. The tension spring values ​​are applied to the analysis events created in the second assembly model to obtain the displacement results of the corresponding scraper arm deformation; the created analysis events include the following four analysis events: applying positive force, negative force, positive torque and negative torque to both sides of the connector respectively; Based on the displacement results of the scraper arm deformation, determine whether the stiffness of the scraper arm meets the design requirements; The determination of the scraper arm lifting angle and the spring tension value when the scraper arm pressure and the spring tension are at extreme points includes: Obtain the first curve of the scraper arm pressure versus time, and the second curve of the tension spring force versus time; Based on the first change curve, the scraper arm pressure value when the scraper arm pressure is at its maximum value is determined, so as to determine the scraper arm lifting angle value. Based on the second variation curve, determine the tension value of the tension spring when the tension spring is at its minimum value; The acquisition of the first curve of the scraper arm pressure versus time and the second curve of the tension spring force versus time includes: The wiper arm lifting angle and the wiper brush flipping angle are obtained during one working cycle of the wiper. The wiper arm lifting angle and the wiper brush flipping angle during one working cycle are input into the model equation of the wiper arm pressure to obtain the first curve of the change of wiper arm pressure with time. By inputting the wiper arm lifting angle and the wiper brush flipping angle of the wiper in one working cycle into the model equation of the tension spring force, a second curve of the tension spring force versus time is obtained. The model equations for the scraper arm pressure and the tension spring force are both determined by equilibrium equations established using the components consisting of connectors, connecting rods, extension arms, and rivets as the analysis objects.

2. The method for analyzing the stiffness of the wiper arm according to claim 1, characterized in that, The determination of whether the stiffness of the scraper arm meets the design requirements based on the displacement result of the scraper arm deformation includes: The displacement diagram corresponding to the displacement result of the scraper arm deformation is analyzed to obtain the displacement change value at the end of the scraper arm; Based on the displacement change value at the end of the scraper arm, determine whether the stiffness of the scraper arm meets the design requirements.

3. The method for analyzing the stiffness of the wiper arm according to claim 2, characterized in that, The displacement diagram corresponding to the displacement result of the scraper arm deformation is analyzed to obtain the displacement change value of the scraper arm end, including: The displacement results of the scraper arm deformation corresponding to each of the analysis events are visualized to obtain the displacement diagram of the scraper arm for each analysis event. The displacement diagram of the scraper arm for each of the analysis events is analyzed to obtain the displacement change value of the scraper arm end for each analysis event.

4. The method for analyzing the stiffness of the wiper arm according to any one of claims 1 to 3, characterized in that, The step of applying the tension spring value to the analysis events created in the second assembly model to obtain the corresponding displacement results of the scraper arm deformation includes: The second assembly model is meshed using the finite element analysis module to obtain the meshed assembly model. Perform a mesh quality check on the assembly model after mesh generation to obtain the assembly model after mesh quality check; If the mesh quality in the assembly model after the mesh quality check is greater than the preset mesh quality, the connection relationship and connection characteristics of the scraper arm component are created sequentially to obtain the third assembly model; To obtain the fourth assembly model, dummy components and constraints are sequentially created for the scraper arm component in the third assembly model. The tension spring value is applied to the analysis event created by the fourth assembly model to obtain the displacement result of the corresponding scraper arm deformation.

5. The method for analyzing the stiffness of the wiper arm according to claim 4, characterized in that, The analytical method further includes: If the mesh quality in the assembly model after the mesh quality check is less than the preset mesh quality, mesh optimization is performed on the mesh in the assembly model after the mesh quality check to obtain a mesh-optimized assembly model. The mesh quality in the mesh-optimized assembly model is checked until the mesh quality is greater than or equal to the preset mesh quality.

6. The method for analyzing the stiffness of the wiper arm according to claim 4, characterized in that, The process of sequentially creating virtual components and adding constraints to the scraper arm component in the third assembly model yields the fourth assembly model, including: A virtual component is created for the scraper arm component in the third assembly model to obtain the assembly model after the virtual component is created; wherein, the virtual component includes a rigid virtual component, a flexible spring virtual component, and a flexible virtual component; Constraints are added to the scraper arm component in the assembly model after the virtual component is created to obtain the fourth assembly model; wherein, the constraints include clamping constraints and cylindrical hinge constraints.

7. The method for analyzing the stiffness of the wiper arm according to claim 4, characterized in that, The analytical method further includes: The connection relationships between the mesh, scraper material, and scraper component in the fourth assembly model are checked to obtain the checked fourth assembly model. If the mesh cannot be divided in the fourth assembly model after inspection, the connection relationship between the scraper arm material and the scraper arm component is adjusted to obtain the adjusted fourth assembly model.

8. A device for analyzing the stiffness of a wiper arm, characterized in that, The analytical apparatus is used to implement the steps in the analytical method according to any one of claims 1 to 7.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the analysis method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the analysis method according to any one of claims 1 to 7.

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