CN102621161B - Method for obtaining material performance parameter - Google Patents

Abstract

The invention provides a method for obtaining material performance parameters, which includes performing frequency division processing on a microwave signal of a predetermined frequency to generate frequency division data corresponding to the frequency of the microwave signal; using the microwave signal to obtain the tested material Response data under the action of a predetermined external force; obtaining the stress value and loss angle value of the tested material in the microwave signal according to the frequency division data and the reaction data. The method also includes obtaining a preset displacement control value corresponding to the predetermined external force; obtaining a standard strain value corresponding to the displacement control value according to the relationship between the displacement control value and the standard strain value; obtaining the the test strain value of the tested material under the action of the predetermined external force; calculate the displacement control value, the standard strain value and the test strain value to obtain an actual strain value.

Description

A method for obtaining material performance parameters

technical field

The invention relates to the field of material performance detection and data processing, in particular to a method for acquiring material performance parameters.

Background technique

Before the application of materials, especially high-end materials, it is necessary to test the material properties to determine the actual use of the material based on the material performance parameters. Among them, the material performance parameters generally include stress values, strain values, and loss angle values.

When the material is subjected to a microwave signal at a certain temperature and a certain frequency and cannot be displaced under the action of an external force, its geometric shape and size will be deformed, and this deformation is called strain. When the material is deformed, an internal force of equal size but opposite direction is generated to resist the external force. This reaction force per unit area is called stress. The strain lags the stress, and there is a phase difference between the two, and this phase difference is the loss angle.

However, there is currently no method for obtaining material performance parameters to achieve accurate acquisition of material performance parameters.

Contents of the invention

The technical problem to be solved by the present invention is to provide a material performance parameter acquisition method to solve the technical problem in the prior art that the accurate acquisition of high-end material performance parameters such as strain, stress and loss angle cannot be achieved.

The invention provides a method for obtaining material performance parameters, the method comprising:

performing frequency division processing on a microwave signal of a predetermined frequency to generate frequency division data corresponding to the frequency of the microwave signal;

Using the microwave signal to acquire the reaction data of the tested material under the predetermined external force;

The stress value and loss angle value of the tested material in the microwave signal are obtained according to the frequency division data and the reaction data.

The above method, preferably, the method also includes:

Acquiring a preset displacement control value corresponding to the predetermined external force;

obtaining a standard strain value corresponding to the displacement control value according to the relationship between the displacement control value and the standard strain value;

Acquiring the test strain value of the tested material under the action of the predetermined external force;

Calculate the displacement control value, the standard strain value and the test strain value to obtain an actual strain value.

In the above method, preferably, the calculation of the displacement control value, the standard strain value and the test strain value to obtain the actual strain value specifically includes:

The displacement control value, the standard strain value and the test strain value are denoted as um, by and cy respectively;

Obtain the deviation cy-by between the test strain value cy and the standard strain value by, and obtain the deviation rate according to the deviation and the standard strain value

in accordance with $\mathrm{wy}=\mathrm{um}+\frac{\mathrm{cy}-\mathrm{by}}{\mathrm{by}}\×\mathrm{um}$ Get the actual strain value;

为所述测试应变值的偏差率相对于所述位移控制值的偏差值，计算得出的wy为所述实际应变值。in,

is the deviation rate of the test strain value relative to the deviation value of the displacement control value, and the calculated wy is the actual strain value.

In the above method, preferably, obtaining the stress value and loss angle value of the tested material in the microwave signal according to the frequency division data and the reaction data specifically includes:

extracting intermediate data of the reaction data, and obtaining an array of intermediate data;

Extracting even-numbered data and odd-numbered data from the intermediate data array to obtain a first intermediate data array and a second intermediate data array, respectively;

Calculate the frequency-division data, the first intermediate data array, and the second intermediate data array to obtain a stress value and a loss angle value.

In the above method, preferably, calculating the frequency division data, the first intermediate data array and the second intermediate data array, and obtaining the stress value and loss angle value include:

Dividing the frequency-division data and the first intermediate data array into multiple arrays respectively, and calculating the grouped data of the frequency-division data and the first intermediate data array to obtain a first stress data array;

Divide the frequency-division data and the second intermediate data array into multiple arrays respectively, and calculate the grouped data of the frequency-division data and the second intermediate data array to obtain the second stress data array and the second stress data array Three stress data arrays;

Sorting the data in the second stress data array to obtain stress values;

Acquiring an intermediate stress data array according to the first stress data array and the third stress data array;

Judging whether the data in the intermediate stress data array is greater than 270 degrees, if so, obtain the absolute value of the difference between the data item and 360 degrees of the data greater than 270 degrees, and use the absolute value as the intermediate stress data array A data item corresponding to the data item, otherwise, use the data item as the data item corresponding to the data item in the intermediate stress data array;

Sorting the data in the intermediate stress data array to obtain the loss angle value.

A material performance parameter acquisition method provided by the present invention is to perform frequency division processing on a microwave signal of a predetermined frequency, and use the microwave signal to obtain the reaction data of the tested material under the action of a predetermined external force, according to the frequency division data and the obtained The reaction data obtains the stress value and loss angle value of the tested material in the microwave signal, and at the same time, obtains the displacement control value corresponding to the predetermined external force, according to the relationship between the displacement control value and the standard strain value Obtaining the standard strain value corresponding to the displacement control value and obtaining the test strain value of the tested material under the action of the predetermined external force, for the displacement control value, the standard strain value and the test strain Values are calculated to obtain the actual strain value. Therefore, the use of the tested material is judged according to the stress value, the loss angle value and the strain value.

Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned advantages at the same time.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the application. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a flow chart of Embodiment 1 of a method for acquiring material performance parameters provided by the present invention;

Fig. 2 is a partial flowchart of Embodiment 2 of a method for obtaining material performance parameters provided by the present invention;

Fig. 3 is a partial flowchart of Embodiment 2 of a method for acquiring material performance parameters provided by the present invention;

Fig. 4 is a flow chart of Embodiment 3 of a method for acquiring material performance parameters provided by the present invention;

Fig. 5 is a partial flowchart of Embodiment 3 of a method for obtaining material property parameters provided by the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

With reference to Fig. 1, it has shown the flow chart of a kind of material performance parameter acquisition method provided by the present invention, and described method may comprise the following steps:

Step 101: Perform frequency division processing on a microwave signal of a predetermined frequency to generate frequency division data corresponding to the frequency of the microwave signal.

Among them, the method embodiment 1 provided by the present invention is used to obtain the performance parameters of the tested material. The performance parameters of the tested material refer to the fact that under the action of a microwave signal at a specific frequency, a predetermined external force is applied to the tested material but the tested material The displacement remains unchanged, but its geometric shape and size will be deformed. At this time, the deformation of the tested material is called strain. When the material under test is deformed, an equal and opposite force will be generated inside the material under test to resist the predetermined external force, and this force per unit area is called stress. While the strain lags the stress, there is a phase difference between the two, the phase difference and the loss angle.

Wherein, the frequency division data corresponding to the frequency of the microwave signal is obtained by performing frequency division processing on the high-frequency microwave signal generated by the microwave signal generator and pre-applied to the material to be tested.

Step 102: Using the microwave signal to acquire response data of the tested material under a predetermined external force.

Wherein, the order of the step 101 and the step 102 can be interchanged without affecting the execution result of the method of the present invention.

Wherein, the high-frequency microwave signal is applied to the tested material, and a predetermined external force is applied to the tested material at the same time, and the reaction data of the tested material under the action of the microwave signal under the predetermined external force is acquired.

Step 103: Obtain the stress value and loss angle value of the tested material in the microwave signal according to the frequency division data and the reaction data.

Wherein, the frequency division data and the reaction data are calculated, and the stress value and the loss angle value of the tested material in the microwave signal are obtained according to the distribution data and the reaction data.

It can be seen from the above scheme that the first embodiment of a method for obtaining material performance parameters provided by the present invention generates frequency-division data corresponding to the frequency of the microwave signal by performing frequency-division processing on a microwave signal of a predetermined frequency. The signal acquires the response data of the tested material under the predetermined external force, and acquires the stress value and the loss angle value of the tested material in the microwave signal according to the frequency division data and the response data. Therefore, the use of the tested material can be judged according to the stress value and the loss angle value.

Referring to FIG. 2 , it shows a partial flowchart of Embodiment 2 of a method for acquiring material performance parameters provided by the present invention. Based on Method Embodiment 1 of the present invention, the method may further include the following steps:

Step 201: Obtain a preset displacement control value corresponding to the predetermined external force.

Wherein, the corresponding relationship between the external force applied to the tested material and its preset displacement control value is preset, and when the predetermined external force is applied to the tested material in the microwave signal, the corresponding value of the predetermined external force is obtained. Displacement control value.

Step 202: Obtain a standard strain value corresponding to the displacement control value according to the relationship between the displacement control value and the standard strain value.

Wherein, before obtaining the material property parameters of the tested material, the relationship between the displacement control value and the standard strain value is set. When setting the relationship between the displacement control value and the standard strain value, it can be set according to the historical data obtained from the parameter acquisition of the tested material. Thus, the standard strain value corresponding to the displacement control value is obtained according to the relationship between the displacement control value and the standard strain value. For example, formulate the displacement to be controlled, that is, the relationship between the displacement control value and the standard strain value, such as: a value of 600 corresponds to 5 microns, and after obtaining the displacement control value corresponding to the predetermined external force, based on the relationship between the above two, the Standard strain value, 600*displacement control value/5 is the standard strain value corresponding to the displacement control value.

Step 203: Obtain a test strain value of the tested material under the action of the predetermined external force.

Wherein, the execution order of the step 201 and the step 202 and the step 203 can be exchanged without affecting the execution of the solution of the present invention, for example, the step 203 is executed first, and then the step 201 and the step 202 are executed .

Wherein, the data acquisition is performed on the strain generated by the tested material under the action of the predetermined external force, that is, the test strain value of the tested material under the action of the predetermined external force is acquired.

Step 204: Calculate the displacement control value, the standard strain value and the test strain value to obtain an actual strain value.

Wherein, after obtaining the displacement control value, the standard strain value and the test strain value, calculating the displacement control value, the standard strain value and the test strain value to obtain an actual strain value, The specific calculation process, as shown in Figure 3 provided by the present invention, includes:

Step 301: Record the displacement control value, the standard strain value and the test strain value as um, by and cy, respectively.

Step 302: Obtain the deviation cy-by between the test strain value cy and the standard strain value by, and obtain the deviation rate according to the deviation cy-by and the standard strain value by

Step 303: Based on $\mathrm{wy}=\mathrm{um}+\frac{\mathrm{cy}-\mathrm{by}}{\mathrm{by}}\×\mathrm{um}$ Get the actual strain value;

为所述测试应变值的偏差率相对于所述位移控制值的偏差值，计算得出的wy为所述实际应变值。in,

is the deviation rate of the test strain value relative to the deviation value of the displacement control value, and the calculated wy is the actual strain value.

It can be known from the above scheme that the second embodiment of the method for obtaining material performance parameters provided by the present invention obtains the displacement control value corresponding to the predetermined external force, and obtains the relationship between the displacement control value and the standard strain value according to the relationship between the displacement control value and the standard strain value. the standard strain value corresponding to the displacement control value and obtain the test strain value of the tested material under the action of the predetermined external force, and calculate the displacement control value, the standard strain value and the test strain value to obtain the actual strain value. Therefore, the use of the tested material can be judged according to the strain value.

Referring to FIG. 4 , it shows a flowchart of Embodiment 3 of a method for obtaining material performance parameters provided by the present invention. Based on Embodiment 1 of the method of the present invention, the step 103 may include the following steps:

Step 403: extract the intermediate data of the reaction data, and obtain an array of intermediate data.

Wherein, before calculating the frequency division data and the response data, in order to improve the accuracy of data calculation, data extraction is performed on the response data, and the middle part of the response data can be extracted according to a preset extraction rule. data, and form an array of intermediate data from the extracted intermediate data, and the size of the array is determined according to the extraction rule.

Step 404: Extract even-numbered data and odd-numbered data from the intermediate data array to obtain a first intermediate data array and a second intermediate data array respectively.

Wherein, the intermediate data array obtained by the accurate data extraction is extracted again, and divided into two groups of data, that is, the even-numbered data is extracted from the intermediate data array, and the first intermediate data composed of the even-numbered data is obtained. An array, forming a second intermediate data array from the remaining odd-numbered data in the intermediate data array.

Step 405: Calculate the frequency division data, the first intermediate data array, and the second intermediate data array to obtain stress values and loss angle values.

It should be noted that the step 401 and the step 402 are consistent with the step 101 and the step 102 described in the first method embodiment of the present invention, and will not be repeated here.

Wherein, in the step 405, the specific calculation process, as shown in Figure 5 provided by the present invention, includes:

Step 501: divide the frequency-division data and the first intermediate data array into multiple arrays respectively, and calculate the grouped data of the frequency-division data and the first intermediate data array to obtain the first stress data array.

Wherein, the frequency-division data, the first intermediate data array, and the second intermediate data array are respectively denoted as w[n1], y1Data[n3], and y2Data[n4], wherein n1, n3, and n4 are respectively is the number of data in the frequency division data, the first intermediate data array and the second intermediate data array.

Wherein, in the step 501, w[n1] and y1Data[n3] are respectively divided into multiple arrays, and the data grouped by w[n1] and y1Data[n3] are calculated to obtain the first stress data array, which can be Recorded as deg yi[n8];

Wherein, n8 is the number of data in the first stress data array.

Wherein, the specific calculation process in the step 501 includes:

Separately divide wt[n1] and y1Data[n3] into multiple arrays to form multiple array combination sets composed of two arrays, for example, divide wt[n1] and y1Data[n3] into 10 arrays, and extract them A set of arrays combining wt1[n5] and yData1[n6];

Among them, n5 and n6 are the number of data in the array wt1[n5] and array yData1[n6] respectively;

in accordance with $x1\left[i\right]=\cos \left(\mathrm{\ωt}1\right[i\left]\right)-\frac{\underset{i=0}{\overset{\mathrm{no}5-1}{\mathrm{\Σ}}}\cos \left(\mathrm{\ωt}1\right[i\left]\right)}{\mathrm{no}5},$ $x2\left[i\right]=\sin \left(\mathrm{\ωt}1\right[i\left]\right)-\frac{\underset{i=0}{\overset{\mathrm{no}5-1}{\mathrm{\Σ}}}\sin \left(\mathrm{\ωt}1\right[i\left]\right)}{\mathrm{no}5}$ and $\mathrm{the\; y}\left[i\right]=\mathrm{yData}1\left[i\right]-\frac{\underset{i=0}{\overset{\mathrm{no}6-1}{\mathrm{\Σ}}}\mathrm{yData}\left[i\right]}{\mathrm{no}6}$ Obtain the first intermediate number x1[n5], the second intermediate array x2[n5] and the third intermediate array y[n6] respectively;

Among them, i∈[0,n5-1], wt[i] is the i-th data of wt[n1], yData1[i] is the i-th data of yData1[n6];

in accordance with $a=\frac{N2\×k2-N3\×k1}{N2\×N2-N1\×N3},$ $b=\frac{N2\×k1-N1\×k2}{N2\×N2-N1\×N3}$ Obtain the first intermediate variable a and the second intermediate variable b from x1[n5], x2[n5] and y[n6];

in, $k1=\underset{i=0}{\overset{\mathrm{no}5-1}{\mathrm{\Σ}}}\left(\mathrm{the\; y}\right[i]\×x1[i\left]\right),$ $k2=\underset{i=0}{\overset{\mathrm{no}5-1}{\mathrm{\Σ}}}\left(\mathrm{the\; y}\right[i]\×x2[i\left]\right),$ $N1=\underset{i=0}{\overset{\mathrm{no}5-1}{\mathrm{\Σ}}}\left(x1\right[i]\×x1[i\left]\right),$ $N2=\underset{i=0}{\overset{\mathrm{no}5-1}{\mathrm{\Σ}}}\left(x1\right[i]\×x2[i\left]\right),$ $N3=\underset{i=0}{\overset{\mathrm{no}5-1}{\mathrm{\Σ}}}\left(x2\right[i]\×x2[i\left]\right),$ x1[i], x2[i] and y[i] are the first data of x1[n5], x2[n5] and y[n6] respectively;

对a的平方与b的平方进行加和后取该加和值的平方根，获取第三中间变量A1；in accordance with

After summing the square of a and the square of b, taking the square root of the sum to obtain the third intermediate variable A1;

Determine the values of a and b, and obtain the fifth intermediate variable degree1 as the first data of deg yi[n8] according to a and b;

Among them, if a>0 and b<0, the fourth intermediate variable ${\mathrm{the\; angle}=}^{\arcsin \left(\frac{-b}{A1}\right)},$ If a > 0 and b > 0, ${\mathrm{the\; angle}=}^{2\mathrm{\&pi;}-\arcsin \left(\frac{b}{A1}\right)},$ If a<0 and b<0, ${\mathrm{the\; angle}=}^{\mathrm{\&pi;}-\arcsin \left(\frac{-b}{A1}\right)},$ If a<0 and b>0, ${\mathrm{the\; angle}=}^{\mathrm{\&pi;}+\arcsin \left(\frac{b}{A1}\right)};$

获取第五中间变量degree1作为deg yi[n8]的第一数据；in accordance with

Obtain the fifth intermediate variable degree1 as the first data of deg yi[n8];

Calculate other array combinations in the array combination set according to the above method to obtain other data in deg yi[n8].

Step 502: divide the frequency-division data and the second intermediate data array into multiple arrays respectively, and calculate the grouped data of the frequency-division data and the second intermediate data array to obtain second stress data array and a third array of stress data.

Wherein, wt[n1] and yData2[n4] are respectively calculated according to the data calculation method of wt[n1] and yData1[n3] in the above step 501 to obtain deg yi[n8] to obtain the third stress data array deg li [n8].

Wherein, wt[n1] and yData2[n4] are respectively calculated according to the data calculation method for calculating the grouped data of wt[n1] and yData1[n3] in the above step 501 to obtain multiple A1 values to obtain the second stress data array Ali[n7].

Step 503: Sorting the data in the second stress data array to obtain stress values.

Among them, the data in Ali[n7] are sorted, and the sorting rules can be selected from large to small, and the fourth data after the sorting is calculated to obtain the stress value of the tested material .

Step 504: Obtain an intermediate stress data array according to the first stress data array and the third stress data array.

Among them, according to degi[j]=|degli[j]-deg yi[j]|, deg li[n8] and deg yi[n8] are calculated to obtain degi[n8], where j∈[0,n8- 1], degi[j] is the jth data in degi[n8], degli[j] is the jth data in degli[n8], deg yi[j] is the jth data in deg yi[n8] .

Step 505: Judging whether the data in the intermediate stress data array is greater than 270 degrees, if yes, execute step 506, otherwise execute step 507;

Step 506: Obtain the absolute value of the difference between the data item whose data is greater than 270 degrees and 360 degrees, and use the absolute value as the data item corresponding to the data item in the intermediate stress data array;

Step 507: Use the data item as a data item corresponding to the data item in the intermediate stress data array.

Wherein, it is judged whether each item of data in degi[n8] is greater than 270 degrees, if yes, then obtain the absolute value of the difference between the data item whose data is greater than 270 degrees and 360 degrees, and use the absolute value as deg[n8] Otherwise, use the data item as the data item corresponding to the data item in deg[n8].

Step 508: Sort the data in the intermediate stress data array to obtain the loss angle value.

Among them, the data in deg[n8] are sorted, and the sorting rules can be selected from large to small, and the fourth sorted data is selected as the loss angle value of the tested material.

It can be seen from the above scheme that the third embodiment of a method for obtaining material performance parameters provided by the present invention generates frequency-division data corresponding to the frequency of the microwave signal by performing frequency-division processing on a microwave signal of a predetermined frequency, and using the microwave The signal acquires the response data of the tested material under the predetermined external force, and extracts the response data, and obtains the stress value and the loss angle value according to the frequency division data and the extracted response data, so as to ensure the stress value and the loss angle value accuracy. Therefore, the use of the tested material can be judged according to the stress value and the loss angle value.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can.

The method for acquiring material performance parameters provided by this application has been introduced in detail above. In this paper, specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above examples are only used to help understand the method of this application. and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation and application scope. limits.

Claims (4)

1. A method for acquiring material performance parameters is characterized by comprising the following steps:

performing frequency division processing on a microwave signal with a preset frequency to generate frequency division data corresponding to the frequency of the microwave signal;

acquiring reaction data of the tested material under the action of a preset external force by using the microwave signal;

acquiring a stress value and a loss angle value of the tested material in the microwave signal according to the frequency division data and the reaction data;

acquiring a preset displacement control value corresponding to the preset external force;

obtaining a standard strain value corresponding to the displacement control value according to the relation between the displacement control value and the standard strain value;

acquiring a test strain value of the tested material under the action of the preset external force;

and calculating the displacement control value, the standard strain value and the test strain value to obtain an actual strain value.

2. The method of claim 1, wherein the calculating the displacement control value, the standard strain value, and the test strain value to obtain an actual strain value specifically comprises:

recording the displacement control value, the standard strain value and the test strain value as um, by and cy respectively;

acquiring the deviation cy-by of the test strain value cy and the standard strain value by, and acquiring a deviation rate according to the deviation cy-by and the standard strain value by

According to $\mathrm{wy}=\mathrm{um}+\frac{\mathrm{cy}-\mathrm{by}}{\mathrm{by}}\&times;\mathrm{um}$ Acquiring an actual strain value;

wherein,

and calculating wy which is a deviation value of the deviation rate of the test strain value relative to the displacement control value and is the actual strain value.

3. The method of claim 1, wherein obtaining the stress value and the loss angle value of the material under test in the microwave signal according to the frequency division data and the response data specifically comprises:

extracting intermediate data of the reaction data to obtain an intermediate data array;

extracting even data and odd data from the intermediate data array to respectively obtain a first intermediate data array and a second intermediate data array;

and calculating the frequency division data, the first intermediate data array and the second intermediate data array to obtain a stress value and a loss angle value.

4. The method of claim 3, wherein calculating the frequency-divided data, the first intermediate data array, and the second intermediate data array to obtain stress values and loss angle values comprises:

dividing the frequency division data and the first intermediate data array into a plurality of arrays respectively, and calculating the data after the frequency division data and the first intermediate data array are grouped to obtain a first stress data array;

dividing the frequency division data and the second intermediate data array into a plurality of arrays respectively, and calculating the data after the frequency division data and the second intermediate data array are grouped to obtain a second stress data array and a third stress data array;

sequencing all data in the second stress data array to obtain stress values;

acquiring a middle stress data array according to the first stress data array and the third stress data array;

judging whether each item of data in the middle stress data array is larger than 270 degrees, if so, acquiring a difference absolute value between a data item of which the data is larger than 270 degrees and 360 degrees, and taking the absolute value as a data item corresponding to the data item in the middle stress data array, otherwise, taking the data item as a data item corresponding to the data item in the middle stress data array;

and sequencing all data in the middle stress data array to obtain a loss angle value.

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