A method, system, device, and storage medium for constructing a skin creep compliance

Abstract

The application belongs to the field of biomechanical test data processing, and discloses a skin creep compliance construction method, system, device and storage medium. The method performs negative pressure suction test on the tested skin, obtains test parameters and original displacement-time data of the tested skin in the test process; identifies a test starting point, a creep starting point and a test termination point according to the change of the displacement of the tested skin with the test time; determines a compensation factor based on the displacement change amount from the test starting point to the test termination point and the displacement change amount from the creep starting point to the test termination point; compensates the displacement value of the tested skin based on the test parameters and the compensation factor, and obtains a creep compliance sequence according to a nonlinear calculation relationship.

Description

Technical Field

[0001] This application belongs to the field of biomechanical test data processing, specifically relating to a method, system, device and storage medium for constructing skin creep flexibility data. Background Technology

[0002] In in vivo skin biomechanics testing, negative pressure inhalation testing is widely used to obtain the displacement response of the tested skin under negative pressure due to its non-invasive nature and good force control. By performing negative pressure inhalation testing on the tested skin, raw displacement-time data of the skin during the negative pressure inhalation test can be obtained. Constructing skin creep compliance based on this raw displacement-time data is an important means of characterizing the viscoelastic properties of the skin and can provide a basis for subsequent mechanical analysis and parameter calculation.

[0003] In existing technologies, after setting a negative pressure, the raw displacement-time data obtained from the negative pressure suction test is usually directly substituted into the classical creep compliance formula to obtain the creep compliance sequence. This approach typically assumes that the negative pressure loading process can be approximated as an ideal step loading, and treats the overall displacement response after loading as the object of creep analysis.

[0004] However, in actual negative pressure inhalation testing, the establishment of negative pressure usually takes time due to factors such as gas compressibility and tubing flow resistance. This results in the initial skin displacement response containing both transient elastic and viscous flow responses. If the test start point, creep start point, and test end point are not identified based on the change in skin displacement over time, and if the change in skin displacement is not compensated accordingly, systematic errors can easily occur in the creep compliance calculation results at the initial stage. Furthermore, the skin under negative pressure typically undergoes significant deformation, and the relationship between skin displacement and test parameters is not a simple linear one; ignoring this nonlinear relationship will also affect the accuracy of the creep compliance calculation results. Therefore, a technical solution that can combine the characteristics of negative pressure inhalation testing to more accurately construct skin creep compliance is urgently needed. Summary of the Invention

[0005] The purpose of this application is to provide a method, system, device and storage medium for constructing skin creep flexibility, so as to overcome the technical problem that the construction results of skin creep flexibility are subject to systematic errors due to the failure to compensate for the displacement of the tested skin based on the feature points in the negative pressure inhalation test and the failure to consider the nonlinear calculation relationship between the displacement of the tested skin and the test parameters.

[0006] To achieve the above objectives, this application adopts the following technical solution: In a first aspect, this application provides a method for constructing skin creep flexibility, comprising: Negative pressure inhalation test was performed on the test skin to obtain the test parameters of the negative pressure inhalation test and the original displacement-time data of the test skin during the negative pressure inhalation test; Based on the change of the tested skin displacement with test time in the original displacement-time data, feature points in the original displacement-time data are identified; wherein, the feature points include the test start point, the creep start point, and the test end point; The compensation factor is determined based on the change in skin displacement from the test start point to the test end point and the change in skin displacement from the creep start point to the test end point. Based on the test parameters and the compensation factor, the measured skin displacement value between the creep start point and the test end point is compensated, and the creep compliance sequence is calculated as the skin creep compliance construction result according to the nonlinear calculation relationship between the measured skin displacement and the test parameters.

[0007] Furthermore, based on the change in the measured skin displacement over time in the original displacement-time data, feature points in the original displacement-time data are identified, including: The test start point is determined by the test time before negative pressure loading, and the displacement value of the tested skin at the test start point is obtained. ; The test time corresponding to the moment when elastic deformation ends and viscous creep begins is defined as the creep initiation point, and the displacement value of the tested skin corresponding to the creep initiation point is obtained. ; The test time corresponding to the end of the negative pressure inhalation test is defined as the test termination point, and the displacement value of the tested skin corresponding to the test termination point is obtained. .

[0008] Furthermore, the compensation factor satisfies:

[0009] in, As a compensation factor, The test result is the displacement value of the skin at the test termination point. The test starts at the point where the skin displacement value corresponds to the test starting point. This represents the measured skin displacement value corresponding to the creep initiation point.

[0010] Furthermore, compensation is performed on the measured skin displacement value between the creep initiation point and the test termination point, including: For any test time between the creep start point and the test end point The measured skin displacement value corresponding to the creep initiation point As a compensation benchmark, the test time is determined. Corresponding skin displacement value The measured skin displacement value corresponding to the creep initiation point The difference in the cube of displacement between them; Based on compensation factor The displacement cubic difference is compensated to obtain the compensated measured skin displacement cubic term. ; The compensated cubic term of the measured skin displacement satisfy:

[0011] in, The compensated cubic term of the measured skin displacement. For testing time The corresponding skin displacement value being tested, This represents the measured skin displacement value corresponding to the creep initiation point. This is a compensation factor.

[0012] Furthermore, the creep compliance sequence satisfy:

[0013] in, For testing time The corresponding creep compliance, For constant terms, The compensated cubic term of the measured skin displacement. Set as negative pressure; The constant term satisfy:

[0014] in, For constant terms, This is an estimated value for the thickness of the skin being tested. The aperture radius of the negative pressure probe used in the negative pressure inhalation test. It is Poisson's ratio.

[0015] Furthermore, the test parameters include a negative pressure setpoint. The aperture radius of the negative pressure probe used in the negative pressure inhalation test Estimated skin thickness Compared to Poisson .

[0016] Furthermore, the nonlinear calculation relationship between the measured skin displacement and the test parameters satisfies:

[0017] in, For testing time The corresponding instantaneous negative pressure applied to the tested skin. This is an estimated value for the thickness of the skin being tested. These are the initial stress parameters. The aperture radius of the negative pressure probe used in the negative pressure inhalation test. For testing time The corresponding skin displacement value being tested, For elastic modulus, It is Poisson's ratio.

[0018] Secondly, this application provides a skin creep flexibility construction system, comprising: The data acquisition module is used to perform negative pressure inhalation tests on the tested skin, and to acquire the test parameters of the negative pressure inhalation test and the original displacement-time data of the tested skin during the negative pressure inhalation test. The feature point recognition module is used to identify feature points in the original displacement-time data based on the change of the tested skin displacement with test time; wherein, the feature points include the test start point, creep start point, and test end point; The compensation factor determination module is used to determine the compensation factor based on the change in the displacement of the tested skin from the test start point to the test end point, and the change in the displacement of the tested skin from the creep start point to the test end point. The flexibility construction module is used to compensate the measured skin displacement value between the creep start point and the test end point based on the test parameters and the compensation factor, and calculate the creep flexibility sequence as the skin creep flexibility construction result according to the nonlinear calculation relationship between the measured skin displacement and the test parameters.

[0019] Thirdly, this application provides 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 computer program to implement the steps of the skin creep flexibility construction method as described above.

[0020] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the skin creep flexibility construction method described above.

[0021] Compared with the prior art, this application has the following beneficial technical effects: Firstly, this application provides a method for constructing skin creep compliance parameters. This involves performing a negative pressure inhalation test on the tested skin to obtain test parameters and the original displacement-time data of the skin during the test. Based on the change in skin displacement over time, the method identifies the test start point, creep start point, and test end point, enabling the creep compliance parameter construction process to distinguish key response nodes during negative pressure loading. Furthermore, compensation factors are determined based on the changes in skin displacement from the test start point to the test end point and the changes in skin displacement from the creep start point to the test end point. These factors are then used to compensate for the skin displacement values ​​between the creep start point and the test end point. Finally, a creep compliance parameter sequence is calculated according to the nonlinear relationship between the skin displacement and the test parameters. This reduces the systematic error introduced by directly using the original displacement response for creep compliance parameter construction, making the obtained creep compliance parameter sequence more accurately reflect the true creep response of the tested skin during the negative pressure inhalation test.

[0022] Secondly, this application provides a skin creep compliance construction system. Through a data acquisition module, it acquires test parameters from a negative pressure inhalation test and the original displacement-time data of the tested skin during the negative pressure inhalation test. A feature point recognition module identifies the test start point, creep start point, and test end point. A compensation factor determination module determines the compensation factor. Finally, a compliance construction module compensates for the displacement values ​​of the tested skin between the creep start point and the test end point to calculate the creep compliance sequence. This allows the system to complete skin creep compliance construction according to the processing chain of data acquisition, feature point recognition, compensation factor determination, and compliance construction. Therefore, each processing step and method flow can be seamlessly connected, reducing the interference of initial loading effects and displacement nonlinearity in the original displacement response on the construction results, and improving the accuracy and stability of the skin creep compliance construction results.

[0023] Thirdly, this application provides a computer device that executes a specific computer program through a processor, enabling efficient implementation of the steps of the method of this application. When performing data processing tasks, the computer device can accurately perform numerical calculations and logical judgments, avoiding errors caused by human factors. At the same time, since the computer program has high stability and reliability, it can ensure the accuracy and consistency of the data processing results.

[0024] Fourthly, this application provides a computer-readable storage medium. By programming the steps of the method of this application into a computer program and storing it on a computer-readable storage medium, users can easily load these programs onto any compatible computer device and execute them without rewriting or converting the code, which greatly improves the convenience and flexibility of program execution. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart of the skin creep flexibility construction method in the embodiments of this application.

[0027] Figure 2 This is a diagram showing the original displacement-time data of each part in the embodiments of this application.

[0028] Figure 3 This is a graph showing the creep compliance-time data for each part in the embodiments of this application.

[0029] Figure 4 This is a schematic diagram of the skin creep flexibility construction system in an embodiment of this application. Detailed Implementation

[0030] In in vivo skin mechanics testing, negative pressure inhalation testing can be used to obtain the displacement response of the tested skin under negative pressure over time. Existing methods for constructing creep compliance parameters typically calculate directly based on the original displacement-time data, without fully considering the key response nodes during the negative pressure loading process and the nonlinear calculation relationship between the tested skin displacement and the test parameters. This makes the creep compliance parameter construction results susceptible to the influence of the initial loading response and nonlinear deformation.

[0031] Based on the above background, this application proposes a method, system, device, and storage medium for constructing skin creep compliance parameters. By identifying the test start point, creep start point, and test end point, and determining the compensation factor based on the measured skin displacement change from the test start point to the test end point and the measured skin displacement change from the creep start point to the test end point, and then compensating the measured skin displacement value between the creep start point and the test end point in combination with the test parameters, a creep compliance parameter sequence is obtained. This helps to reduce systematic errors and makes the construction results more reflective of the true creep response of the tested skin.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Example 1: Reference Figure 1 This embodiment provides a method for constructing skin creep compliance parameters. This method is applied to a negative pressure inhalation test scenario, and is used to construct a creep compliance parameter sequence that characterizes the creep response of the tested skin based on the original displacement-time data generated during the negative pressure inhalation test. The creep compliance parameter sequence is then used as the skin creep compliance parameter construction result.

[0034] In this embodiment, a negative pressure inhalation test is performed on the tested skin to obtain the test parameters and the raw displacement-time data of the tested skin during the negative pressure inhalation test. The test parameters are used to characterize the test conditions during the negative pressure inhalation test, and the raw displacement-time data are used to characterize the displacement response of the tested skin as a function of the test time during the negative pressure inhalation test. Since the displacement change of the tested skin during the negative pressure inhalation test is related not only to the response of the tested skin itself but also to the test conditions of the negative pressure inhalation test, using both the test parameters and the raw displacement-time data as the input basis for the skin creep compliance construction method ensures that the subsequent construction process of the creep compliance sequence corresponds to the actual negative pressure inhalation test conditions, avoiding isolated processing of the raw displacement-time data without considering the test conditions.

[0035] In this embodiment, feature points in the original displacement-time data are identified based on the changes in the tested skin displacement over time. These feature points include the test start point, creep start point, and test end point. The test start point, creep start point, and test end point are used to calibrate key test times during the negative pressure inhalation test in the original displacement-time data, allowing the original displacement-time data to be further utilized according to the response changes during the test. By identifying these feature points, the skin creep compliance construction method can extract key response nodes related to before negative pressure loading, the start of creep, and the end of the test from the original displacement-time data, avoiding the indiscriminate use of the entire original displacement response as the basis for creep compliance construction, thereby reducing the impact of the initial response of negative pressure loading on the creep compliance construction results.

[0036] In this embodiment, a compensation factor is determined based on the change in skin displacement from the test start point to the test end point, and the change in skin displacement from the creep start point to the test end point. The change in skin displacement from the test start point to the test end point reflects the overall displacement change of the test skin throughout the negative pressure inhalation test, while the change in skin displacement from the creep start point to the test end point reflects the displacement change of the test skin after the creep start point. By determining the compensation factor based on these two changes in skin displacement, the overall displacement change throughout the negative pressure inhalation test can be correlated with the displacement change after the creep start point. This allows the subsequent compensation process to no longer rely solely on the original displacement change after the creep start point, but can instead be processed in conjunction with the displacement change relationship throughout the entire test.

[0037] In this embodiment, based on the test parameters and the compensation factor, the displacement value of the tested skin between the creep initiation point and the test termination point is compensated. The creep compliance sequence is then calculated as the skin creep compliance construction result according to the nonlinear calculation relationship between the tested skin displacement and the test parameters. The compensation factor participates in the compensation of the tested skin displacement value between the creep initiation point and the test termination point, ensuring that the tested skin displacement value entering the creep compliance sequence calculation process reflects the displacement change relationship between the test initiation point, the creep initiation point, and the test termination point. The test parameters participate in the nonlinear calculation between the tested skin displacement and the test conditions, ensuring that the creep compliance sequence construction process considers the nonlinear deformation characteristics of the tested skin during negative pressure inhalation testing. Therefore, the skin creep compliance construction method combines feature point identification, compensation factor determination, tested skin displacement value compensation, and nonlinear calculation relationships, reducing the systematic errors caused by directly constructing creep compliance based on the original displacement-time data. This results in a creep compliance sequence that better reflects the true creep response of the tested skin during negative pressure inhalation testing.

[0038] Example 2: The skin creep flexibility construction method provided in this embodiment further explains the feature point identification process in the original displacement-time data based on Embodiment 1.

[0039] In this embodiment, feature points in the original displacement-time data are identified based on the change in the measured skin displacement over time. These feature points include the test start point, creep start point, and test end point. The test start point, creep start point, and test end point are all test times during the negative pressure inhalation test, used to determine the corresponding test stage boundaries in the original displacement-time data. The measured skin displacement value corresponding to each feature point is used to participate in the determination of subsequent measured skin displacement changes and compensation factors.

[0040] In this embodiment, the test time before negative pressure loading is determined as the test starting point, and the displacement value of the tested skin corresponding to the test starting point is obtained. The test start point characterizes the test time before the tested skin is subjected to the current negative pressure loading, and the displacement value of the tested skin corresponding to the test start point is... Used to characterize the initial displacement before negative pressure loading. This is achieved by determining the test starting point and the corresponding skin displacement value. This can provide an initial displacement basis for subsequently determining the change in skin displacement from the test start point to the test end point.

[0041] In this embodiment, the test time corresponding to the moment when elastic deformation ends and viscous creep begins is determined as the creep initiation point, and the displacement value of the tested skin corresponding to the creep initiation point is obtained. The creep initiation point characterizes the test time at which the tested skin transitions from the initial response to the viscous creep response under negative pressure loading. The creep initiation point corresponds to the displacement value of the tested skin. This is used to characterize the displacement of the tested skin at the instant when elastic deformation ends and viscous creep begins. It involves determining the creep initiation point and the corresponding skin displacement value. In subsequent processing, the creep initiation point can be used as the compensation benchmark to avoid indiscriminately including the initial response of negative pressure loading into the creep compliance construction process.

[0042] In this embodiment, the test time corresponding to the end of the negative pressure inhalation test is determined as the test termination point, and the displacement value of the tested skin corresponding to the test termination point is obtained. The test termination point characterizes the test time corresponding to the end of this negative pressure inhalation test, and the corresponding skin displacement value at the test termination point. This is used to characterize the displacement of the tested skin at the end of the negative pressure inhalation test. The test termination point and the corresponding skin displacement value at that point are determined. This can provide a basis for determining the measured skin displacement change from the test start point to the test end point, as well as the measured skin displacement change from the creep start point to the test end point.

[0043] In this embodiment, the test start point, creep start point, and test end point are identified in the original displacement-time data, and the displacement value of the tested skin corresponding to the test start point is obtained respectively. The measured skin displacement value corresponding to the creep initiation point and the measured skin displacement value corresponding to the test termination point This method can establish a correlation between key test times during negative pressure inhalation testing and corresponding skin displacement values. Therefore, the skin creep compliance construction method can utilize displacement data with clear test stage meaning in subsequent compensation calculations, rather than directly treating the entire original displacement-time data as a unified creep analysis object, thereby improving the specificity of subsequent compensation factor determination and creep compliance sequence construction.

[0044] Example 3: The skin creep compliance construction method provided in this embodiment further explains the determination process of the compensation factor and the cubic term of the compensated skin displacement, based on Embodiment 2.

[0045] In this embodiment, the test is based on the displacement value of the skin under test corresponding to the test starting point. The measured skin displacement value corresponding to the creep initiation point and the measured skin displacement value corresponding to the test termination point Determine the compensation factor K. This includes the displacement value of the tested skin corresponding to the test starting point. The measured skin displacement value corresponding to the initial displacement before negative pressure loading and the creep initiation point. The measured skin displacement is used to characterize the instant when elastic deformation ends and viscous creep begins; the measured skin displacement value corresponds to the test termination point. Used to characterize the displacement of the tested skin at the end of the negative pressure inhalation test.

[0046] In this embodiment, the change in skin displacement from the test start point to the test end point is determined by the skin displacement value corresponding to the test end point. The measured skin displacement value corresponding to the test starting point It is determined that the change in skin displacement from the creep initiation point to the test termination point is determined by the skin displacement value corresponding to the test termination point. The measured skin displacement value corresponding to the creep initiation point Determined. The change in skin displacement from the test start point to the test end point reflects the overall displacement change throughout the negative pressure inhalation test, while the change in skin displacement from the creep start point to the test end point reflects the displacement change of the skin after entering the viscous creep response. By simultaneously utilizing these two changes in skin displacement, the compensation factor can be adjusted. It can demonstrate the relationship between the overall displacement change during the entire negative pressure inhalation test and the displacement change after the creep initiation point.

[0047] In this embodiment, the compensation factor satisfy:

[0048] in, As a compensation factor, The test result is the displacement value of the skin at the test termination point. The test starts at the point where the skin displacement value corresponds to the test starting point. This represents the measured skin displacement value corresponding to the creep initiation point.

[0049] In this embodiment, the compensation factor The compensation factor is determined by the ratio of the change in skin displacement from the test start point to the test end point to the change in skin displacement from the creep start point to the test end point. This allows the displacement relationship between the test start point, creep start point, and test end point to be incorporated into subsequent compensation calculations. This enables the calculation of the measured skin displacement after the creep start point to be adjusted in conjunction with the overall displacement changes throughout the negative pressure inhalation test. Consequently, the bias introduced by constructing compliance parameters solely based on the original displacement changes after the creep start point can be reduced.

[0050] In this embodiment, when determining the compensation factor Next, compensation is performed on the measured skin displacement values ​​between the creep initiation point and the test termination point. Specifically, this compensation is applied to any test time between the creep initiation point and the test termination point. The measured skin displacement value corresponding to the creep initiation point As a compensation benchmark, the test time is determined. Corresponding skin displacement value The measured skin displacement value corresponding to the creep initiation point The cubic difference of displacement between them; then based on the compensation factor The displacement cubic difference is compensated to obtain the compensated measured skin displacement cubic term. .in, For testing time The corresponding skin displacement value being measured.

[0051] In this embodiment, the compensated cubic term of the measured skin displacement satisfy:

[0052] in, The compensated cubic term of the measured skin displacement. For testing time The corresponding skin displacement value being tested, This represents the measured skin displacement value corresponding to the creep initiation point. This is a compensation factor.

[0053] In this embodiment, Used to characterize test time The displacement cube difference between the measured skin displacement value and the measured skin displacement value at the creep initiation point. Since the creep initiation point corresponds to the moment when elastic deformation ends and viscous creep begins, the measured skin displacement value at the creep initiation point is used. As a benchmark, the displacement level before the creep initiation point can be distinguished from subsequent compensation calculations. This is achieved by using the displacement cubic difference and the compensation factor. Multiplying these terms yields the compensated cubic term of the measured skin displacement. This allows the measured skin displacement value between the creep initiation point and the test termination point to be included in the calculation of the subsequent creep compliance sequence in a compensated form.

[0054] In this embodiment, the compensation factor and the compensated cubic term of the measured skin displacement Together, they are used to connect the feature point recognition results with the subsequent creep compliance sequence calculation process. Compensation factor The cubic term of the compensated skin displacement reflects the proportional relationship between the overall displacement change during the entire testing process and the displacement change after the creep initiation point. This proportional relationship is then applied to the displacement cube difference based on the creep initiation point. Through the above processing, the skin creep compliance construction method can complete the compensation of the measured skin displacement value between the creep initiation point and the test termination point before entering the compliance calculation, thereby reducing the influence of the initial response of negative pressure loading and the selection of the creep initiation point on the skin creep compliance construction results.

[0055] Example 4: The skin creep compliance construction method provided in this embodiment further explains the nonlinear calculation relationship between test parameters, the displacement of the tested skin and the test parameters, and the calculation process of the creep compliance sequence based on embodiment 3.

[0056] In this embodiment, the test parameters for the negative pressure inhalation test include the negative pressure setpoint. The aperture radius of the negative pressure probe used in the negative pressure inhalation test Estimated skin thickness Compared to Poisson Among them, the negative pressure setting value The aperture radius of the negative pressure probe used in negative pressure inhalation testing is used to characterize the level of negative pressure applied during the test. Probe structural parameters used to characterize skin deformation during negative pressure inhalation testing, and estimated skin thickness. Poisson's ratio is used to characterize the thickness of the skin being tested. These parameters characterize the deformation of the tested skin during the stress deformation process. By incorporating these test parameters into the skin creep compliance construction process, the calculation of the creep compliance sequence can be correlated with the negative pressure inhalation test conditions, the negative pressure probe structural parameters, and the parameters of the tested skin itself.

[0057] In this embodiment, the nonlinear calculation relationship between the measured skin displacement and the test parameters satisfies:

[0058] in, For testing time The corresponding instantaneous negative pressure applied to the tested skin. This is an estimated value for the thickness of the skin being tested. These are the initial stress parameters. The aperture radius of the negative pressure probe used in the negative pressure inhalation test. For testing time The corresponding skin displacement value being tested, For elastic modulus, It is Poisson's ratio.

[0059] In this embodiment, the nonlinear calculation relationship is used to characterize the correspondence between the displacement of the tested skin and the test parameters during the negative pressure inhalation test. The tested skin typically undergoes bulging deformation during the negative pressure inhalation test, and the relationship between the tested skin displacement and the test parameters is not a simple linear one. By introducing the aforementioned nonlinear calculation relationship into the creep compliance sequence calculation process, the skin creep compliance construction method can consider the nonlinear deformation characteristics of the tested skin under negative pressure, avoiding the inaccuracy of the construction results caused by relying solely on linear displacement relationships for creep compliance construction.

[0060] In this embodiment, the compensated cubic term of the measured skin displacement is obtained in Example 3. Subsequently, based on the compensated cubic term of the measured skin displacement... constant term and negative pressure setting value Calculate the test time Corresponding creep compliance Among them, the cubic term of the compensated measured skin displacement. Negative pressure setpoint is used to characterize the calculated displacement of the compensated skin. A constant term used to characterize the pressure conditions during negative pressure inhalation testing. The calculation process that incorporates the estimated thickness of the tested skin, the aperture radius of the negative pressure probe, and Poisson's ratio into the creep compliance sequence.

[0061] In this embodiment, the creep compliance sequence satisfy:

[0062] in, For testing time The corresponding creep compliance, For constant terms, The compensated cubic term of the measured skin displacement. This is the negative pressure setting value.

[0063] In this embodiment, the constant term satisfy:

[0064] in, For constant terms, This is an estimated value for the thickness of the skin being tested. The aperture radius of the negative pressure probe used in the negative pressure inhalation test. It is Poisson's ratio.

[0065] In this embodiment, the constant term Estimated value of the thickness of the tested skin The aperture radius of the negative pressure probe used in the negative pressure inhalation test and Poisson's ratio Determined jointly. By using the constant term Introducing creep compliance sequences The calculation process allows for the creation of creep compliance sequences. The calculation not only depends on the displacement data of the tested skin, but also on the thickness of the tested skin, the structural parameters of the negative pressure probe, and the deformation parameters of the tested skin.

[0066] In this embodiment, the compensated cubic term of the measured skin displacement constant term and negative pressure setting value Jointly participating in creep compliance sequence The calculation. Due to the cubic term of the compensated measured skin displacement. Compensation has been performed based on the measured skin displacement value and compensation factor corresponding to the creep initiation point, and the creep compliance sequence... The calculation further incorporates test parameters and their corresponding nonlinear calculation relationships. Therefore, the skin creep compliance construction method can reduce the influence of the initial response during negative pressure loading while taking into account the nonlinear deformation characteristics of the tested skin during negative pressure inhalation testing. The resulting creep compliance sequence... It can better reflect the creep response of the tested skin during the negative pressure inhalation test.

[0067] Example 5: This embodiment, based on the aforementioned embodiments, verifies and explains the method for constructing skin creep flexibility through specific testing procedures.

[0068] In this embodiment, negative pressure inhalation tests were performed on the cheeks, arms, and fingertips of the test subjects to obtain raw displacement-time data for each area. The test parameters for the negative pressure inhalation test were uniformly set as follows: negative pressure setpoint. The negative pressure probe used in the negative pressure inhalation test has an aperture radius r = 2 mm, an estimated skin thickness h = 2 mm, and a Poisson's ratio. By acquiring raw displacement-time data for different locations under the same test parameters, subsequent feature point identification, compensation factor determination, and creep compliance sequence calculation processes can have a consistent test parameter basis.

[0069] In this embodiment, the original displacement-time data for each part are as follows: Figure 2 As shown. Based on Figure 2 The original displacement-time data shown is used to identify the test start point, creep start point, and test end point based on the change in skin displacement at each location over time, and to obtain the skin displacement value corresponding to each feature point. The skin displacement value corresponding to the test start point is denoted as... The displacement value of the tested skin corresponding to the creep initiation point is denoted as The displacement value of the tested skin corresponding to the test termination point is recorded as... .

[0070] Table 1 shows the skin displacement values ​​corresponding to the test starting points for each body part. The measured skin displacement value corresponding to the creep initiation point The measured skin displacement value corresponding to the test termination point and compensation factors .

[0071] Table 1. Displacement values ​​and compensation factors corresponding to characteristic points of each part.

[0072] In this embodiment, based on Table 1 , and According to the compensation factor The calculation relationship determines the compensation factor corresponding to each part. For the cheek area, a compensation factor is determined based on the change in skin displacement from the test start point to the test end point and the change in skin displacement from the creep start point to the test end point. The value is 6.0436; for the arm area, the compensation factor is determined. The value is 4.9053; for the fingertip position, the compensation factor is determined. The value is 2.5698. Therefore, the compensation factor for different parts... It can correspond to the displacement changes in their respective original displacement-time data, so that subsequent compensation calculations can match the displacement response of different measured parts.

[0073] In this embodiment, compensation factors are based on the corresponding parts. The measured skin displacement value between the creep initiation point and the test termination point is compensated. Specifically, for any test time between the creep initiation point and the test termination point... The measured skin displacement value corresponding to the creep initiation point of the corresponding part. As a compensation benchmark, the test time is determined. Corresponding skin displacement value The measured skin displacement value corresponding to the creep initiation point The cubic difference of displacement between them; then based on the compensation factor of the corresponding part. The displacement cubic difference is compensated to obtain the compensated displacement cubic term of the tested skin at the corresponding location. This process allows the measured skin displacement values ​​between the creep initiation point and the test termination point to be included in subsequent creep compliance sequence calculations in a compensated form.

[0074] In this embodiment, based on the compensated cubic term of the measured skin displacement constant term and negative pressure setting value Calculate the creep compliance sequence corresponding to each part. Among them, the constant term Based on the estimated skin thickness h and the pore radius of the negative pressure probe used in the negative pressure inhalation test... and Poisson's ratio Determined. This is achieved by calculating the cubic term of the compensated measured skin displacement. constant term and negative pressure setting value Used together for creep compliance sequences The calculation allows the calculation process to simultaneously consider the characteristic point compensation results and the negative pressure inhalation test conditions.

[0075] In this embodiment, the creep compliance-time data for each part, calculated as described above, are as follows: Figure 3 As shown. By Figure 3 It can be seen that corresponding creep compliance sequences can be formed on the cheek, arm, and fingertips. These creep compliance sequences are formed by identifying the test start point, creep initiation point, and test termination point, and incorporating a compensation factor. The nonlinear calculation relationship between test parameters and the displacement of the tested skin and test parameters is obtained, which can characterize the creep response changes of different test sites during the negative pressure inhalation test.

[0076] In this embodiment, based on Figure 2 The original displacement-time data shown, the measured skin displacement values ​​and compensation factors corresponding to the feature points shown in Table 1, and... Figure 3 The creep compliance-time data shown demonstrates that the skin creep compliance construction method can complete feature point identification, compensation factor determination, skin displacement compensation, and creep compliance sequence output based on actual negative pressure inhalation test data. Therefore, this skin creep compliance construction method can complete skin creep compliance construction under actual test conditions, and the constructed creep compliance sequence better reflects the creep response of the tested skin.

[0077] Example 6 This embodiment provides a skin creep flexibility construction system. For example... Figure 4 As shown, the skin creep flexibility construction system includes a data acquisition module, a feature point recognition module, a compensation factor determination module, and a flexibility construction module.

[0078] In this embodiment, the data acquisition module is used to perform a negative pressure inhalation test on the tested skin, acquiring the test parameters and the raw displacement-time data of the tested skin during the negative pressure inhalation test. The test parameters characterize the test conditions during the negative pressure inhalation test, and the raw displacement-time data characterizes the displacement response of the tested skin as a function of the test time. Acquiring the test parameters and raw displacement-time data through the data acquisition module provides a data foundation for subsequent feature point identification, compensation factor determination, and creep compliance sequence calculation.

[0079] In this embodiment, the feature point recognition module is used to identify feature points in the original displacement-time data based on the change in the displacement of the tested skin over the test time. These feature points include the test start point, creep start point, and test end point. By identifying the test start point, creep start point, and test end point through the feature point recognition module, key test times can be extracted from the original displacement-time data, providing a basis for subsequently determining the amount of change in the tested skin displacement.

[0080] In this embodiment, the compensation factor determination module determines a compensation factor based on the change in skin displacement from the test start point to the test end point, and the change in skin displacement from the creep start point to the test end point. The change in skin displacement from the test start point to the test end point reflects the overall displacement change throughout the negative pressure inhalation test, while the change in skin displacement from the creep start point to the test end point reflects the displacement change after the creep start point. By determining the compensation factor through the compensation factor determination module, the system can compensate for the skin displacement value after the creep start point by utilizing the displacement change relationship throughout the test during subsequent compliance construction.

[0081] In this embodiment, the compliance construction module is used to compensate for the measured skin displacement value between the creep initiation point and the test termination point based on the test parameters and the compensation factor, and calculates the creep compliance sequence as the skin creep compliance construction result according to the nonlinear calculation relationship between the measured skin displacement and the test parameters. By compensating for the measured skin displacement value and calculating the creep compliance sequence through the compliance construction module, the construction result can simultaneously consider the feature point recognition result, the compensation factor, and the test parameters, reducing the systematic error introduced by directly constructing the creep compliance based on the original displacement-time data.

[0082] In this embodiment, the data acquisition module, feature point recognition module, compensation factor determination module, and flexibility construction module cooperate with each other, enabling the skin creep flexibility construction system to complete skin creep flexibility construction according to the processing chain of data acquisition, feature point recognition, compensation factor determination, and flexibility construction. For specific limitations of the skin creep flexibility construction system, please refer to the limitations of the skin creep flexibility construction method above; the corresponding technical effects can also be obtained accordingly, and will not be elaborated further here.

[0083] Each module in the aforementioned skin creep flexibility construction system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the corresponding operations of each module.

[0084] Example 7: This embodiment provides a computer device. The computer device includes a processor and a computer-readable storage medium; the processor is adapted to execute a computer program; the computer-readable storage medium stores a computer program, which, when executed by the processor, implements the skin creep flexibility construction method described in the above embodiment.

[0085] Specifically, when the computer program is executed by the processor, it can perform the following steps: perform a negative pressure inhalation test on the tested skin, obtain the test parameters of the negative pressure inhalation test and the original displacement-time data of the tested skin during the negative pressure inhalation test; identify feature points in the original displacement-time data based on the change of the tested skin displacement with test time in the original displacement-time data; determine a compensation factor based on the change of the tested skin displacement from the test start point to the test end point and the change of the tested skin displacement from the creep start point to the test end point; compensate the tested skin displacement value between the creep start point and the test end point based on the test parameters and the compensation factor, and calculate the creep compliance sequence as the skin creep compliance construction result according to the nonlinear calculation relationship between the tested skin displacement and the test parameters.

[0086] In this embodiment, the computer device can be a terminal device, server, or other computing device with data processing capabilities. For specific limitations regarding the computer device executing the skin creep flexibility construction method, please refer to the limitations of the skin creep flexibility construction method described above; the corresponding technical effects can also be obtained accordingly, and will not be repeated here.

[0087] Example 8: This embodiment provides a computer-readable storage medium. The computer-readable storage medium stores a computer program adapted to be loaded by a processor and executed by the skin creep flexibility construction method described in the above embodiment.

[0088] Specifically, when the computer program is loaded and executed by the processor, it can perform the following steps: perform a negative pressure inhalation test on the tested skin, obtain the test parameters of the negative pressure inhalation test and the original displacement-time data of the tested skin during the negative pressure inhalation test; identify feature points in the original displacement-time data based on the change of the tested skin displacement with test time in the original displacement-time data; determine a compensation factor based on the change of the tested skin displacement from the test start point to the test end point and the change of the tested skin displacement from the creep start point to the test end point; compensate the tested skin displacement value between the creep start point and the test end point based on the test parameters and the compensation factor, and calculate the creep compliance sequence as the skin creep compliance construction result according to the nonlinear calculation relationship between the tested skin displacement and the test parameters.

[0089] For specific limitations on the skin creep flexibility construction method implemented by the computer program stored in the computer-readable storage medium, please refer to the limitations on the skin creep flexibility construction method above. The corresponding technical effects can also be obtained accordingly, and will not be repeated here.

[0090] The various embodiments in this specification are described in a progressive manner, and the same or similar parts in each embodiment can be referred to each other; where there is no conflict, the technical features in each embodiment can be combined with each other. The above-described embodiments are only preferred embodiments of this application and are not intended to limit the scope of protection of this application. For those skilled in the art, various modifications, equivalent substitutions and improvements can be made to the technical solutions of this application without departing from the spirit and substance of this application, and all such modifications, equivalent substitutions and improvements should fall within the scope of protection of this application.

Claims

1. A method for constructing skin creep flexibility, characterized in that, include: Negative pressure inhalation test was performed on the test skin to obtain the test parameters of the negative pressure inhalation test and the original displacement-time data of the test skin during the negative pressure inhalation test; Based on the change of the tested skin displacement with test time in the original displacement-time data, feature points in the original displacement-time data are identified; wherein, the feature points include the test start point, the creep start point, and the test end point; The compensation factor is determined based on the change in skin displacement from the test start point to the test end point and the change in skin displacement from the creep start point to the test end point. Based on the test parameters and the compensation factor, the measured skin displacement value between the creep start point and the test end point is compensated, and the creep compliance sequence is calculated as the skin creep compliance construction result according to the nonlinear calculation relationship between the measured skin displacement and the test parameters.

2. The method for constructing skin creep flexibility according to claim 1, characterized in that, Based on the change in the measured skin displacement over time in the original displacement-time data, feature points in the original displacement-time data are identified, including: The test start point is determined by the test time before negative pressure loading, and the displacement value of the tested skin at the test start point is obtained. ; The test time corresponding to the moment when elastic deformation ends and viscous creep begins is defined as the creep initiation point, and the displacement value of the tested skin corresponding to the creep initiation point is obtained. ; The test time corresponding to the end of the negative pressure inhalation test is defined as the test termination point, and the displacement value of the tested skin corresponding to the test termination point is obtained. .

3. The method for constructing skin creep flexibility according to claim 2, characterized in that, The compensation factor satisfies: in, As a compensation factor, The test result is the displacement value of the skin at the test termination point. The test starts at the point where the skin displacement value corresponds to the test starting point. This represents the measured skin displacement value corresponding to the creep initiation point.

4. The method for constructing skin creep flexibility according to claim 3, characterized in that, Compensation is provided for the measured skin displacement values ​​between the creep initiation point and the test termination point, including: For any test time between the creep start point and the test end point The measured skin displacement value corresponding to the creep initiation point As a compensation benchmark, the test time is determined. Corresponding skin displacement value The measured skin displacement value corresponding to the creep initiation point The difference in the cube of displacement between them; Based on compensation factor The displacement cubic difference is compensated to obtain the compensated measured skin displacement cubic term. ; The compensated cubic term of the measured skin displacement satisfy: in, The compensated cubic term of the measured skin displacement. For testing time The corresponding skin displacement value being tested, This represents the measured skin displacement value corresponding to the creep initiation point. This is a compensation factor.

5. The method for constructing skin creep flexibility according to claim 4, characterized in that, The creep compliance sequence satisfy: in, For testing time The corresponding creep compliance, For constant terms, The compensated cubic term of the measured skin displacement. Set as negative pressure; The constant term satisfy: in, For constant terms, This is an estimated value for the thickness of the skin being tested. The aperture radius of the negative pressure probe used in the negative pressure inhalation test. It is Poisson's ratio.

6. The method for constructing skin creep flexibility according to claim 1, characterized in that, The test parameters include the negative pressure setpoint. The aperture radius of the negative pressure probe used in the negative pressure inhalation test Estimated skin thickness Compared to Poisson .

7. The method for constructing skin creep flexibility according to claim 6, characterized in that, The nonlinear calculation relationship between the measured skin displacement and the test parameters satisfies: in, For testing time The corresponding instantaneous negative pressure applied to the tested skin. This is an estimated value for the thickness of the skin being tested. These are the initial stress parameters. The aperture radius of the negative pressure probe used in the negative pressure inhalation test. For testing time The corresponding skin displacement value being tested, For elastic modulus, It is Poisson's ratio.

8. A skin creep flexibility construction system, characterized in that, include: The data acquisition module is used to perform negative pressure inhalation tests on the tested skin, and to acquire the test parameters of the negative pressure inhalation test and the original displacement-time data of the tested skin during the negative pressure inhalation test. The feature point recognition module is used to identify feature points in the original displacement-time data based on the change of the tested skin displacement with test time; wherein, the feature points include the test start point, creep start point, and test end point; The compensation factor determination module is used to determine the compensation factor based on the change in the displacement of the tested skin from the test start point to the test end point, and the change in the displacement of the tested skin from the creep start point to the test end point. The flexibility construction module is used to compensate the measured skin displacement value between the creep start point and the test end point based on the test parameters and the compensation factor, and calculate the creep flexibility sequence as the skin creep flexibility construction result according to the nonlinear calculation relationship between the measured skin displacement and the test parameters.

9. A computer device, characterized in that, include: Processor and computer-readable storage media; A processor, adapted to execute computer programs; A computer-readable storage medium storing a computer program that, when executed by the processor, implements the skin creep flexibility construction method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program adapted to be loaded by a processor and executed as described in any one of claims 1 to 7.

Images