Sound-absorbing material flow resistance measurement method, system, flow resistance meter and storage medium

Abstract

The present application discloses a method, system, flow resistance meter and storage medium for measuring the flow resistance of sound-absorbing materials. The method for measuring the flow resistance of sound-absorbing materials includes: obtaining the equipment parameters of the flow resistance meter and the sample parameters of the sample to be measured; based on the equipment parameters and the preset initial value of the detected airflow, automatically calculating the airflow working range of the flow resistance meter, and determining the airflow array to be measured based on the airflow working range; according to the preset stability parameter reading method, cyclically reading the target flow and target pressure difference corresponding to each airflow power point in the airflow array to be measured; based on the sample parameters and the target flow and target pressure difference corresponding to each airflow power point, calculating the measurement result of the sample to be measured. The present application solves the technical problem of low accuracy in measuring the flow resistance of samples.

Description

Technical Field

[0001] The present application relates to the technical field of flow resistance meter measurement, and in particular to a method and system for measuring the flow resistance of a sound absorbing material, a flow resistance meter and a storage medium. Background Art

[0002] Porous sound-absorbing materials are widely used in the field of sound absorption and noise reduction. The sound absorption performance of porous sound-absorbing materials is closely related to the resistance encountered by airflow when passing through the sound-absorbing materials. The resistance can be described by flow resistance. At present, the direct measurement of the flow resistance of porous sound-absorbing materials has been standardized by ISO_9053. It is obtained by measuring the pressure difference and air volume flow rate generated by steady-state airflow passing through the two sides of the porous sound-absorbing materials. However, it is impossible to determine the appropriate airflow during the measurement process. Often, an airflow is arbitrarily set within the range of the air source flow to collect the corresponding pressure difference and air volume flow rate, which may result in large measurement errors in the measured pressure difference and air volume flow rate, which in turn leads to low accuracy in measuring the flow resistance of porous sound-absorbing materials.

[0003] The foregoing description is intended to provide general background information and does not necessarily constitute the background technology of the present invention. Summary of the invention

[0004] The main purpose of the present application is to provide a method, system, flow resistance meter and storage medium for measuring the flow resistance of sound-absorbing materials, aiming to solve the technical problem of low accuracy in measuring the flow resistance of samples in the prior art.

[0005] To achieve the above object, the present application provides a method for measuring the flow resistance of a sound absorbing material, the method comprising:

[0006] Obtaining equipment parameters of the flow resistance meter and sample parameters of the sample to be tested;

[0007] Based on the equipment parameters and the preset initial value of the detected airflow, the airflow working range of the flow resistance meter is automatically calculated, and based on the airflow working range, an array of airflows to be measured is determined;

[0008] According to a preset stability parameter reading method, cyclically reading the target flow rate and target pressure difference corresponding to each airflow power point in the airflow array to be measured;

[0009] Based on the sample parameters and the target flow rate and target pressure difference corresponding to each of the airflow power points, the measurement result of the sample to be measured is calculated.

[0010] The present application also provides a sound absorbing material flow resistance measurement system, which is a virtual system and includes:

[0011] An acquisition module, used to acquire the device parameters of the flow resistance meter and the sample parameters of the sample to be tested;

[0012] A first calculation module, configured to automatically calculate the airflow operating range of the flow resistance meter based on the device parameters and a preset initial value of the detected airflow, and determine an array of airflows to be measured based on the airflow operating range;

[0013] A cyclic reading module, used for cyclically reading the target flow rate and target pressure difference corresponding to each airflow power point in the airflow array to be measured according to a preset stability parameter reading method;

[0014] The second calculation module is used to calculate the measurement result of the sample to be measured based on the sample parameters and the target flow rate and target pressure difference corresponding to each of the airflow power points.

[0015] The present application also provides a flow resistance meter, which is a physical flow resistance meter, and includes: a memory, a processor, and a sound absorbing material flow resistance measurement program stored in the memory, and the sound absorbing material flow resistance measurement program is executed by the processor to implement the steps of the sound absorbing material flow resistance measurement method as described above.

[0016] The present application also provides a storage medium, which is a computer-readable storage medium. The computer-readable storage medium stores a sound absorbing material flow resistance measurement program, and the sound absorbing material flow resistance measurement program is executed by a processor to implement the steps of the sound absorbing material flow resistance measurement method as described above.

[0017] The present application provides a method, system, flow resistance meter and storage medium for measuring the flow resistance of a sound-absorbing material. The present application obtains the device parameters of the flow resistance meter and the sample parameters of the sample to be measured, and then automatically calculates the airflow working range of the flow resistance meter based on the device parameters and the preset initial value of the detected airflow, and determines the airflow array to be measured based on the airflow working range. Further, according to the preset stability parameter reading method, the target flow and target pressure difference corresponding to each airflow power point in the airflow array to be measured are cyclically read, and then the measurement result of the sample to be measured is calculated based on the sample parameters and the target flow and target pressure difference corresponding to each airflow power point. The method realizes the automatic calculation of the appropriate airflow working range based on the device parameters and the preset initial value of the detected airflow, so that the target flow and target pressure difference corresponding to each airflow power point are collected based on the airflow working range. The accuracy of the collected flow and pressure difference can be effectively improved by collecting data multiple times, and then the measurement result of the sample to be measured is calculated based on several target flow and target pressure differences and based on the sample parameters, thereby improving the accuracy of the measurement of the sample to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 This is a schematic diagram of the flow chart of the first embodiment of the method for measuring the flow resistance of a sound-absorbing material of the present application;

[0021] Figure 2 It is a structural schematic diagram of the flow resistance meter in this application;

[0022] Figure 3 This is a schematic diagram showing the measurement results in the method for measuring the flow resistance of the sound absorbing material of the present application;

[0023] Figure 4 This is a schematic flow chart of a second embodiment of the method for measuring flow resistance of a sound-absorbing material of the present application;

[0024] Figure 5 A schematic diagram of the flow chart for calculating the lower limit of the detection flow range in the method for measuring the flow resistance of the sound-absorbing material of the present application;

[0025] Figure 6 This is a schematic flow chart of a third embodiment of the method for measuring flow resistance of a sound-absorbing material of the present application;

[0026] Figure 7 A schematic diagram of a flow chart for calculating the upper limit of the detection flow range in the method for measuring the flow resistance of sound-absorbing materials in the present application;

[0027] Figure 8 This is a schematic flow chart of a fourth embodiment of a method for measuring flow resistance of a sound-absorbing material of the present application;

[0028] Fig. 9 A schematic diagram of the process of reading flow rate and pressure difference in the automatic measurement method of this application;

[0029] Fig.10 This is a schematic diagram of the functional modules of the device for measuring the flow resistance of sound-absorbing materials in this application.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] The present application provides a method for measuring the flow resistance of a sound absorbing material. In the first embodiment of the method for measuring the flow resistance of a sound absorbing material of the present application, refer to Figure 1 , the method for measuring the flow resistance of the sound absorbing material comprises:

[0033] Step S10, obtaining the equipment parameters of the flow resistance meter and the sample parameters of the sample to be tested;

[0034] In this embodiment, it should be noted that the sample parameters include parameters such as the cross-sectional area and thickness of the sample to be tested. The sample to be tested is a porous sound-absorbing material, such as foam, various foam plastics, porous sound-absorbing bricks, sugarcane boards, felt and wool, etc. Figure 3 , Figure 3 This is a schematic diagram showing the measurement results in the flow resistance measurement method of the sound-absorbing material of the present application. The user can input the diameter and thickness of the sample to be measured on the terminal device connected to the device or on the display screen of the flow resistance meter, and the cross-sectional area parameters of the sample to be measured can be calculated based on the diameter.

[0035] It should be further explained that the equipment parameters are the range parameters of each sensor in the flow resistance meter, the sensors include flow meters, differential pressure meters and other sensors, and the range parameters include flow range, pressure difference range and gas source range.

[0036] Step S20, automatically calculating the airflow operating range of the flow resistance meter based on the equipment parameters and the preset initial value of the detected airflow, and determining the airflow array to be measured based on the airflow operating range;

[0037] The above step S20: automatically calculating the airflow working range based on the equipment parameters and the preset initial value of the detected airflow, includes:

[0038] Step S21, obtaining the detected flow rate and detected pressure difference of the flow resistance meter at the initial value of the detected airflow;

[0039] Step S22, based on the pressure difference range, flow range, and gas source range, detect the flow rate and detect the pressure difference, and calculate the lower limit value of the detection flow range and the upper limit value of the detection flow range;

[0040] Step S23, determining the airflow operating range based on the lower limit value of the detected flow range and the upper limit value of the detected flow range.

[0041] In this embodiment, it should be noted that the initial value of the detected airflow is artificially set according to the gas source range, and no specific limitation is made here. Preferably, the initial value of the detected airflow is set to 30% of the maximum value of the gas source range, and the airflow working range includes the lower limit value of the detection flow range and the upper limit value of the detection flow range.

[0042] As an implementable embodiment, specifically, for the lower limit of the detection flow range: first, the maximum value in the gas source range is pre-set as the lower limit of the target airflow, and an initial value of the detection airflow is set, and an end mark is set. For example, the first mark value corresponding to the end mark in the initial stage is set to 0, and then the detection flow and detection pressure difference of the flow resistance meter under the initial value of the detection airflow are obtained, wherein it should be noted that the detection flow and detection pressure difference are the average values ​​of the flow and pressure difference measured multiple times by each sensor. Specifically, the parameter information measured by each sensor is obtained, and the parameter information includes pressure difference and flow, and then the number of currently measured parameter information is compared with the preset minimum number. If it is lower than the minimum number, return to the execution step: obtain the parameter information measured by each sensor, and then compare the number of currently measured parameter information with the preset minimum number again, until the number of parameter information measured multiple times is not lower than the minimum number, and then the current number of measured parameter information is compared with the preset minimum number. The number of parameter information measured before is compared with the preset maximum number. If the number of parameter information is greater than or equal to the preset maximum number, the average value of the flow measured each time and the average value of the pressure difference measured each time are calculated, and then the average value of the flow is used as the detected flow, and the average value of the pressure difference is used as the detected pressure difference. If it is lower than the maximum number, it is further determined whether the range results between the flow rates and the range results between the pressure differences are less than the preset range threshold. If it is less than the range threshold, return to the execution step: calculate the average value of the flow measured each time and the average value of the pressure difference measured each time, and then the average value of the flow is used as the detected flow, and the average value of the pressure difference is used as the detected pressure difference. If it is not less than the range threshold, return to the execution step: obtain the parameter information measured by the preset sensors at the airflow power point until the number of the parameter information exceeds the maximum number or the range result is less than the range threshold.After obtaining the detected flow and the detected pressure difference, determine whether the detected flow is lower than the lower limit of the flow range, and whether the detected pressure difference is lower than the lower limit of the pressure difference range. If it is lower than the lower limit, increase the detected airflow initial value. Specifically, based on the detected airflow initial value, the target airflow lower limit and the first preset change ratio, calculate the detected airflow initial value of the current detection times, wherein the first preset change ratio is based on manual custom settings and is not specifically limited here. Furthermore, if it is not lower than the lower limit, determine whether the detected flow exceeds the upper limit of the flow range, and whether the detected pressure difference exceeds the pressure difference. The upper limit value of the range is exceeded. If it exceeds the upper limit value, the initial value of the detected airflow is reduced. Specifically, the initial value of the detected airflow is used as the lower limit value of the target airflow for the current detection times, and the initial value of the detected airflow for the current detection times is calculated based on the initial value of the detected airflow and the second preset change ratio, wherein the second preset change ratio is based on a manual custom setting and is not specifically limited here. If it does not exceed the upper limit value, the initial value of the detected airflow is used as the lower limit value of the target airflow for the current detection times, and based on the lower limit value of the pressure difference range, the detected pressure difference and the initial value of the detected airflow, the first airflow value corresponding to the pressure difference range is calculated, and Based on the lower limit value of the flow range, the detected flow and the initial value of the detected airflow, a second airflow value corresponding to the flow range is calculated, and then the largest value among the first airflow value, the second airflow value and the minimum value of the gas source range is selected as the initial value of the detected airflow for the current number of detections, and the end mark is set to a second mark value, for example, set to 1. Further, it is determined whether the current number of detections reaches the maximum number of detections or whether the range between the lower limit value of the target airflow for the current number of detections and the minimum value of the gas source range is less than a preset range value. If not, the initial value of the detected airflow at the current number of detections is obtained. The corresponding detection flow and detection pressure difference, and return to the execution step: determine whether the detection flow is lower than the lower limit of the flow range, and whether the detection pressure difference is lower than the lower limit of the pressure difference range, until the current detection times reaches the maximum detection times or determine whether the range between the target airflow lower limit value of the current detection times and the minimum value of the air source range is less than the preset range value. If so, further determine whether the end mark is the second mark value. If it is the second mark value, the target airflow lower limit value of the current detection times is used as the lower limit value of the detection flow range. If it is not the second mark value, it proves that the detection has failed, and then an alarm is issued.

[0043] Furthermore, for the upper limit value of the detection flow range: first, the minimum value in the gas source range is pre-set as the upper limit value of the target airflow, and an initial value of the detection airflow is set, and an end mark is set. For example, the first mark value corresponding to the end mark in the initial stage is set to 0, and then the detection flow and detection pressure difference of the flow resistance meter under the initial value of the detection airflow are obtained, wherein the method for obtaining the detection flow and the detection pressure difference is basically the same as the above-mentioned process steps for obtaining the detection flow and the detection pressure difference in the upper limit value of the detection flow range, and will not be repeated here.Then, after obtaining the detected flow and the detected pressure difference, determine whether the detected flow exceeds the upper limit of the flow range, and whether the detected pressure difference exceeds the upper limit of the pressure difference range. If it exceeds the upper limit, reduce the detected airflow initial value. Specifically, based on the detected airflow initial value, the target airflow upper limit and the third preset change ratio, calculate the detected airflow initial value of the current detection times, wherein the third preset change ratio is based on manual custom settings and is not specifically limited here. Furthermore, if it does not exceed the upper limit, determine whether the detected flow is lower than the lower limit of the flow range, and whether the detected pressure difference is lower than the pressure difference. The lower limit value of the range, if it is lower than the lower limit value, the initial value of the detected airflow is increased. Specifically, the initial value of the detected airflow is used as the upper limit value of the target airflow for the current detection times, and based on the initial value of the detected airflow and the fourth preset change ratio, the initial value of the detected airflow for the current detection times is calculated, wherein the fourth preset change ratio is based on a manual custom setting and is not specifically limited here. If it is not lower than the lower limit value, the initial value of the detected airflow is used as the upper limit value of the target airflow for the current detection times, and based on the upper limit value of the pressure difference range, the detected pressure difference and the initial value of the detected airflow, the third airflow value corresponding to the pressure difference range is calculated, and based on Based on the upper limit value of the flow range, the detected flow and the initial value of the detected airflow, a fourth airflow value corresponding to the flow range is calculated, and then the smallest value is selected from the third airflow value, the fourth airflow value and the maximum value of the gas source range as the initial value of the detected airflow of the current detection times, and the end mark is set to the second mark value, for example, the second mark value is set to 1, and further, it is determined whether the current detection times reaches the maximum detection times or whether the range between the target airflow upper limit value of the current detection times and the maximum value of the gas source range is less than the preset range value. If not, the detected airflow at the current detection times is obtained. The detection flow and detection pressure difference corresponding to the initial value, and return to the execution step: determine whether the detection flow exceeds the upper limit value of the flow range, and whether the detection pressure difference exceeds the upper limit value of the pressure difference range, until the current detection times reaches the maximum detection times or it is determined that the range between the target airflow upper limit value of the current detection times and the maximum value of the air source range is less than the preset range value. If so, further determine whether the end mark is the second mark value. If it is the second mark value, the target airflow upper limit value of the current detection times is used as the upper limit value of the detection flow range. If it is not the second mark value, it proves that the detection has failed, and then an alarm is issued.

[0044] Furthermore, it is detected whether the lower limit value of the airflow range and the upper limit value of the detection flow range of the airflow working range are valid. For example, it is detected whether the lower limit value of the airflow range is too small, whether the upper limit value of the airflow range is too large, and whether the lower limit value of the airflow range is lower than the upper limit value of the airflow range. If invalid, it is proved that the airflow working range cannot be automatically calculated. If it is detected that the lower limit value of the airflow range and / or the upper limit value of the detection flow range are manually modified, it is further detected whether the lower limit value of the airflow range and the upper limit value of the detection flow range are valid. If valid, a number of points are selected at the same interval in the airflow working range to form the airflow array to be measured.

[0045] Step S30, according to a preset stability parameter reading method, cyclically reading the target flow rate and target pressure difference corresponding to each airflow power point in the airflow array to be measured;

[0046] In this embodiment, it should be noted that the preset stability parameter reading method is a parameter reading method for averaging the flow and pressure differences obtained multiple times for each airflow power point in the airflow array to be measured. Specifically, the following steps are performed for each airflow power point in the airflow array to be measured:

[0047] First, at the airflow power point, the flow rate and pressure difference measured by each sensor are obtained, and the flow rate and pressure difference are used as parameter information, and then the quantity of the parameter information is compared with a preset minimum quantity, wherein the minimum quantity is manually set in advance according to actual conditions, for example, set to 3. Further, if the quantity of the parameter information is less than the preset minimum quantity, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point, until the quantity of the parameter information is not less than the preset minimum quantity.

[0048] Further, when the amount of the parameter information is not less than a preset minimum amount, it is further determined whether the amount of the parameter information is greater than or equal to a preset maximum amount, wherein the minimum amount is manually set in advance according to actual conditions, for example, set to 20. If it is greater than or equal to the maximum amount, the average value of the flow rate measured each time and the average value of the pressure difference measured each time are calculated, and then the average value of the flow rate is used as the target flow rate of the airflow power point, and the average value of the pressure difference is used as the target pressure difference of the airflow power point. If it is less than the maximum amount, it is determined whether the range results between the flow rates and the range results between the pressure differences are less than a preset range threshold, wherein the The extreme difference threshold is set artificially according to actual conditions, and again there is no specific restriction. If it is less than the extreme difference threshold, each flow rate and each pressure difference are averaged respectively to obtain the target flow rate and target pressure difference corresponding to the airflow power point. If it is not less than the extreme difference threshold, return to the execution step: obtain the parameter information measured by each pre-set sensor at the airflow power point, until the number of the parameter information is greater than or equal to the maximum number or the extreme difference result is less than the extreme difference threshold, and obtain the target flow rate and target pressure difference corresponding to the airflow power point, so that the pressure difference and flow rate are read multiple times at each airflow power point and averaged, so that the obtained target flow rate and target pressure difference are relatively stable and accurate, thereby improving the accuracy of the measurement of the sample to be tested.

[0049] Step S40, calculating and obtaining the measurement result of the sample to be tested based on the sample parameters and the target flow rate and target pressure difference corresponding to each of the airflow power points.

[0050] In this embodiment, specifically, a linear fitting operation is performed on the target flow and target pressure difference corresponding to each of the airflow power points to obtain a fitting result, referring to Figure 2 , Figure 2 The structure diagram of the flow resistance meter in the present application, wherein the flow velocity of the horizontal axis represents the target flow rate, and the pressure difference of the vertical axis represents the target pressure difference. In this embodiment, by linearly fitting the target flow rate and the target pressure difference corresponding to each airflow power point, the flow resistance calculated based on the target flow rate and the target pressure difference corresponding to each airflow power point is the same, thereby improving the accuracy of the measurement of the sample to be tested. Further, based on the fitting result, the flow resistance of the sample to be tested is determined. Further, based on the flow resistance and the sample parameters of the sample to be tested, the specific flow resistance and the flow resistivity of the sample to be tested are calculated. Figure 2The formula for calculating the flow resistance is: R=□p / qv, the formula for calculating the specific flow resistance is: Rs=R×A, and the formula for calculating the flow resistivity is: r=Rs / d, wherein □p represents the pressure difference above and below the sample to be tested (the target pressure difference in this embodiment), qv represents the volume velocity of the airflow passing through the sample to be tested (the target flow rate in this embodiment), A represents the cross-sectional area of ​​the sample to be tested, and d represents the thickness of the sample to be tested.

[0051] Through the above scheme, this embodiment realizes automatic calculation of the appropriate airflow working range based on the equipment parameters and the pre-set initial value of the detected airflow, realizes automatic measurement of the sample flow resistance, and then based on the airflow working range, collects the target flow and target pressure difference corresponding to each airflow power point. By collecting data multiple times, the accuracy of the collected flow and pressure difference can be effectively improved, and then the measurement result of the sample to be tested is calculated through several target flow rates and target pressure differences and based on the sample parameters, thereby improving the measurement accuracy of the sample to be tested.

[0052] Further, refer to Figure 4 Based on the first embodiment of the present application, in another embodiment of the present application, the step of calculating the lower limit value of the detection flow range based on the pressure difference range, the flow range, the gas source range, the detected flow, the detected pressure difference and the detected airflow initial value includes:

[0053] Step A10, setting the maximum value in the gas source range as the target gas flow lower limit value, and presetting an end mark, wherein the end mark is initially set to a first mark value;

[0054] Step A20, determining whether the detected flow rate is lower than the lower limit of the flow rate range, and whether the detected pressure difference is lower than the lower limit of the pressure difference range;

[0055] Step A30, if it is lower than the lower limit, then based on the detected airflow initial value, the target airflow lower limit and the first preset change ratio, the detected airflow initial value of the current detection number is calculated;

[0056] Step A40, if it is not lower than the lower limit, determining whether the detected flow exceeds the upper limit of the flow range, and whether the detected pressure difference exceeds the upper limit of the pressure difference range;

[0057] Step A50, if the upper limit value is exceeded, the detected airflow initial value is used as the target airflow lower limit value of the current detection times, and the detected airflow initial value of the current detection times is calculated based on the detected airflow initial value and the second preset change ratio;

[0058] Step A60, if it does not exceed the upper limit value, the detected airflow initial value is used as the target airflow lower limit value of the current detection times, and based on the target airflow lower limit value, the lower limit value of the pressure difference range, the lower limit value of the flow range, the detected flow, the detected pressure difference and the minimum value of the gas source range, the detected airflow initial value of the current detection times is calculated, and the end mark is set to the second mark value;

[0059] Step A70, determining whether the current detection times or the target airflow lower limit value of the current detection times meets a preset iteration end condition;

[0060] Step A80, if not satisfied, then obtain the detection flow and detection pressure difference corresponding to the initial value of the detection airflow at the current detection number, and return to the execution step: determine whether the detection flow is lower than the lower limit of the flow range, and whether the detection pressure difference is lower than the lower limit of the pressure difference range, until the current detection number or the target airflow lower limit value of the current detection number meets the preset iteration end condition;

[0061] Step A90: If the condition is satisfied and the end mark is the second mark value, the lower limit value of the target airflow of the current detection times is used as the lower limit value of the detection flow range.

[0062] In this embodiment, specifically, the maximum value in the gas source range is first pre-set as the lower limit value of the target airflow, and an initial value of the detected airflow is set, and an end mark is set. For example, the first mark value corresponding to the end mark in the initial stage is set to 0, and then the detected flow and detected pressure difference of the flow resistance meter at the initial value of the detected airflow are obtained, wherein the process of obtaining the detected flow and detected pressure difference can refer to the content in step S20, which will not be repeated here. Furthermore, after obtaining the detected flow and the detected pressure difference, it is determined whether the detected flow is lower than the lower limit of the flow range, and whether the detected pressure difference is lower than the lower limit of the pressure difference range. If it is lower than the lower limit, it proves that the detected airflow initial value needs to be increased. Specifically, based on the detected airflow initial value, the target airflow lower limit and the first preset change ratio, the detected airflow initial value of the current detection times is calculated. For example, the calculation formula for the detected airflow initial value of the current detection times is: k1*(Sr-S0)+S0, wherein k1 represents the first preset change ratio, Sr represents the target airflow lower limit, S0 represents the detected airflow initial value, and K1 is a value greater than 1. Preferably, K1 is set to 1.1.

[0063] Furthermore, if it is not lower than the lower limit value, it is further determined whether the detected flow exceeds the upper limit value of the flow range, and whether the detected pressure difference exceeds the upper limit value of the pressure difference range. If it exceeds the upper limit value, it proves that the initial value of the detected airflow needs to be reduced. Specifically, the initial value of the detected airflow is used as the lower limit value of the target airflow for the current detection times, and based on the product between the initial value of the detected airflow and the second preset change ratio, the initial value of the detected airflow for the current detection times is calculated, wherein the lower limit value of the target airflow for the current detection times: Sr=S0, wherein S0 represents the initial value of the detected airflow, the initial value of the detected airflow for the current detection times=k2*S0, wherein k2 represents the second preset change ratio, K2 is a value less than 1, and preferably, K2 is set to 0.9.

[0064] Furthermore, if it does not exceed the upper limit value, the initial value of the detected airflow is used as the lower limit value of the target airflow for the current number of detections, and then based on the lower limit value of the pressure difference range, the detected pressure difference and the initial value of the detected airflow, the first airflow value corresponding to the pressure difference range is calculated, wherein the calculation formula for the first airflow value corresponding to the pressure difference range is: Sp=S0*Pmin / P, wherein Sp represents the first airflow value, Pmin represents the lower limit value of the pressure difference range, and P represents the detected pressure difference. Further, based on the lower limit value of the flow range, the detected flow and the initial value of the detected airflow, the second airflow value corresponding to the flow range is calculated, wherein the calculation formula for the second airflow value corresponding to the flow range is: SF=S0*Fmin / F, SF represents the second airflow value, Fmin represents the lower limit value of the flow range, and F represents the detected flow. Further, the largest value is selected from the first airflow value, the second airflow value and the minimum value of the gas source range as the initial value of the detected airflow for the current number of detections, wherein the detection value of the current number of detections The initial value of airflow = max(Sp, SF, Smin), Smin represents the minimum value of the gas source range, and the end mark is set to the second mark value, for example, set to 1. Further, it is determined whether the current detection times reaches the maximum detection times or whether the range between the target airflow lower limit value of the current detection times and the minimum value of the gas source range is less than the preset range value. If not, the detection flow and the detection pressure difference corresponding to the initial value of the detection airflow at the current detection times are obtained, and the execution step is returned: it is determined whether the detection flow is lower than the lower limit value of the flow range, and whether the detection pressure difference is lower than the lower limit value of the pressure difference range, until the current detection times reaches the maximum detection times or whether the range between the target airflow lower limit value of the current detection times and the minimum value of the gas source range is less than the preset range value. If so, it is further determined whether the end mark is the second mark value. If it is the second mark value, the target airflow lower limit value of the current detection times is used as the lower limit value of the detection flow range. If it is not the second mark value, it proves that the detection has failed.

[0065] In addition, refer to Figure 5, 5 is a flow chart of calculating the lower limit of the detection flow range in the flow resistance measurement method of the sound-absorbing material of the present application, wherein S0 represents the initial value of the detection airflow, Flag=0 represents the first mark value of the end mark is 0, Sr represents the lower limit of the target airflow, Smax represents the maximum value in the air source range, flow F represents the detection flow, pressure difference P represents the detection pressure difference, F and P exceed the lower limit of the range to indicate whether the detection flow is lower than the lower limit of the flow range, and whether the detection pressure difference is lower than the lower limit of the pressure difference range, F and P Exceeding the upper limit of the range indicates the judgment of whether the detected flow exceeds the upper limit value of the flow range, and whether the detected pressure difference exceeds the upper limit value of the pressure difference range, Pmin indicates the lower limit value of the pressure difference range, Fmin indicates the lower limit value of the flow range, Smin indicates the minimum value in the gas source range, Sp indicates the first airflow value, SF indicates the second airflow value, δ indicates the preset extreme value, k1 indicates the first preset change ratio, k2 indicates the second preset change ratio, and Flag=1 indicates that the second mark value of the end mark is 1.

[0066] The embodiment of the present application realizes, through the above scheme, collecting the corresponding detection pressure difference and detection flow based on the set initial value of the detected airflow. If the detection pressure difference and the detection flow are lower than the lower limit of the measuring range, the lower limit of the detection flow range is increased. If the detection pressure difference and the detection flow exceed the upper limit of the measuring range, the lower limit of the detection flow range is reduced, thereby automatically calculating the appropriate lower limit of the detection flow range, and then accurately obtaining the appropriate airflow working range, and then testing each airflow power point in the airflow working range, thereby improving the accuracy of the flow resistance measurement of the sample to be tested.

[0067] Further, refer to Figure 6 Based on the first embodiment of the present application, in another embodiment of the present application, the step of calculating the upper limit value of the detection flow range based on the pressure difference range, the flow range, the gas source range, the detected flow, the detected pressure difference and the detected airflow initial value includes:

[0068] Step B10, setting the minimum value in the gas source range as the upper limit value of the target gas flow, and presetting an end mark, wherein the end mark is initially set to a first mark value;

[0069] Step B20, determining whether the detected flow exceeds the upper limit of the flow range, and whether the detected pressure difference exceeds the upper limit of the pressure difference range;

[0070] Step B30, if it exceeds the upper limit, then based on the detected airflow initial value, the target airflow upper limit value and the third preset change ratio, the detected airflow initial value of the current detection number is calculated;

[0071] Step B40, if it does not exceed the upper limit value, determining whether the detected flow rate is lower than the lower limit value of the flow rate range, and whether the detected pressure difference is lower than the lower limit value of the pressure difference range;

[0072] Step B50, if it is lower than the lower limit, taking the detected airflow initial value as the target airflow upper limit value of the current detection times, and calculating the detected airflow initial value of the current detection times based on the detected airflow initial value and the fourth preset change ratio;

[0073] Step B60, if it is not lower than the lower limit, the detected airflow initial value is used as the target airflow upper limit value of the current detection times, and the detected airflow initial value of the current detection times is calculated based on the upper limit value of the pressure difference range, the upper limit value of the flow range, the detected flow, the detected pressure difference and the detected airflow initial value, and the end mark is set to the second mark value;

[0074] Step B70, determining whether the current detection times or the target airflow upper limit value of the current detection times meets a preset iteration end condition;

[0075] Step B80, if not satisfied, obtain the detected flow and detected pressure difference corresponding to the initial value of the detected airflow of the current detection number, and return to the execution step: determine whether the detected flow exceeds the upper limit of the flow range, and whether the detected pressure difference exceeds the upper limit of the pressure difference range, until the current detection number or the target airflow upper limit of the current detection number meets the preset iteration end condition;

[0076] Step B90: If the condition is satisfied and the end mark is the second mark value, the upper limit value of the target airflow of the current detection times is used as the upper limit value of the detection flow range.

[0077] In this embodiment, specifically, the minimum value in the gas source range is first pre-set as the upper limit value of the target airflow, and an initial value of the detected airflow is set, and an end mark is set. For example, the first mark value corresponding to the end mark in the initial stage is set to 0, and then the detected flow and detected pressure difference of the flow resistance meter under the initial value of the detected airflow are obtained, wherein the method for obtaining the detected flow and the detected pressure difference is the same as the process steps for obtaining the detected flow and the detected pressure difference in the above-mentioned step S20, which will not be repeated here. After obtaining the detected flow and the detected pressure difference, determine whether the detected flow exceeds the upper limit of the flow range, and whether the detected pressure difference exceeds the upper limit of the pressure difference range. If it exceeds the upper limit, reduce the detected airflow initial value. Specifically, based on the detected airflow initial value, the target airflow upper limit and the third preset change ratio, calculate the detected airflow initial value of the current detection times, wherein the calculation formula of the detected airflow initial value of the current detection times is: k3*(St-S1)+S1, wherein k3 represents the third preset change ratio, St represents the target airflow upper limit, S1 represents the detected airflow initial value, and K3 is a value less than 1. Preferably, K3 can be set to 0.9.

[0078] Further, if it does not exceed the upper limit value, it is determined whether the detected flow is lower than the lower limit value of the flow range, and whether the detected pressure difference is lower than the lower limit value of the pressure difference range. If it is lower than the lower limit value, the initial value of the detected airflow is increased. Specifically, the initial value of the detected airflow is used as the upper limit value of the target airflow for the current detection times, and based on the product of the initial value of the detected airflow and the fourth preset change ratio, the initial value of the detected airflow for the current detection times is obtained, wherein the lower limit value of the target airflow for the current detection times is: St=S1, wherein S1 represents the initial value of the detected airflow, and the initial value of the detected airflow for the current detection times=k4*S1, wherein k4 represents the fourth preset change ratio, and K4 is a value greater than 1. Preferably, K4 is set to 1.1.

[0079] Furthermore, if it is not lower than the lower limit, the initial value of the detected airflow is used as the upper limit of the target airflow for the current number of detections, and then based on the upper limit of the pressure difference range, the detected pressure difference and the initial value of the detected airflow, the third airflow value corresponding to the pressure difference range is calculated, wherein the calculation formula of the third airflow value corresponding to the pressure difference range is: Sp = S1*Pmax / P, wherein Sp represents the third airflow value, Pmax represents the upper limit of the pressure difference range, and P represents the detected pressure difference. Further, based on the upper limit of the flow range, the detected flow and the initial value of the detected airflow, the fourth airflow value corresponding to the flow range is calculated, wherein the calculation formula of the second airflow value corresponding to the flow range is: SF = S1*Fmax / F, SF represents the fourth airflow value, Fmax represents the upper limit of the flow range, and F represents the detected flow. Then, the smallest value is selected from the third airflow value, the fourth airflow value and the maximum value of the gas source range as the initial value of the detected airflow of the current detection times, wherein the initial value of the detected airflow of the current detection times = min(Sp, SF, Smax), Smax represents the maximum value of the gas source range, and the end mark is set to the second mark value, for example, set to 1, and further, it is determined whether the current detection times reaches the maximum detection times or whether the range between the target airflow upper limit value of the current detection times and the maximum value of the gas source range is less than the preset range value. If not, the detection times at the current detection times are obtained. Measure the detection flow and detection pressure difference corresponding to the initial value of the airflow, and return to the execution step: determine whether the detection flow exceeds the upper limit value of the flow range, and whether the detection pressure difference exceeds the upper limit value of the pressure difference range, until the current detection times reaches the maximum detection times or it is determined that the range between the target airflow upper limit value of the current detection times and the maximum value of the air source range is less than the preset range value. If so, further determine whether the end mark is the second mark value. If it is the second mark value, the target airflow upper limit value of the current detection times is used as the upper limit value of the detection flow range. If it is not the second mark value, it proves that the detection has failed.

[0080] In addition, refer to Figure 7 , Figure 7The flow chart of calculating the upper limit value of the detection flow range in the method for measuring the flow resistance of the sound-absorbing material of the present application is shown in FIG. 1 , wherein S1 represents the initial value of the detection flow, Flag=0 represents the first mark value of the end mark is 0, St represents the upper limit value of the target flow, Smin represents the minimum value in the gas source range, flow F represents the detection flow, pressure difference P represents the detection pressure difference, F and P exceed the upper limit of the range to indicate whether the detection flow exceeds the upper limit value of the flow range, and whether the detection pressure difference exceeds the upper limit value of the pressure difference range, F and P exceed the upper limit value of the detection flow. The over-range lower limit indicates the judgment of whether the detected flow rate is lower than the lower limit value of the flow range, and whether the detected pressure difference is lower than the lower limit value of the pressure difference range, Pmax indicates the upper limit value of the pressure difference range, Fmax indicates the upper limit value of the flow range, Smax indicates the maximum value in the gas source range, Sp indicates the third airflow value, SF indicates the fourth airflow value, δ indicates the preset extreme value, k3 indicates the third preset change ratio, k4 indicates the fourth preset change ratio, and Flag=1 indicates that the second mark value of the end mark is 1.

[0081] The embodiment of the present application realizes, through the above scheme, collecting the corresponding detection pressure difference and detection flow based on the set initial value of the detected airflow. If the detection pressure difference and the detection flow exceed the upper limit of the measuring range, the upper limit of the detection flow range is reduced. If the detection pressure difference and the detection flow are lower than the lower limit of the measuring range, the upper limit of the detection flow range is increased, so as to automatically calculate the appropriate lower limit of the detection flow range, and then accurately obtain the appropriate airflow working range, and then test each airflow power point in the airflow working range, so as to improve the accuracy of the flow resistance measurement of the sample to be tested.

[0082] Further, refer to Figure 8 Based on the first embodiment of the present application, in another embodiment of the present application, the step of cyclically reading the target flow and target pressure difference corresponding to each airflow power point in the airflow array to be measured according to the preset stability parameter reading method includes:

[0083] Step C10, for each airflow power point in the airflow array to be measured, obtaining parameter information measured by each preset sensor at the airflow power point, wherein the parameter information includes the flow rate and the pressure difference;

[0084] Step C20, determining whether the amount of the parameter information is less than a preset minimum amount;

[0085] Step C30: if the number is less than the minimum number, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point until the number of the parameter information is not less than the preset minimum number;

[0086] Step C40: if the number is not less than the minimum number, then determining that the number of the parameter information is greater than or equal to the preset maximum number;

[0087] Step C50, if it is greater than or equal to the maximum value of the quantity, respectively calculating the flow average value between each of the flow rates and the pressure difference average value between each of the pressure differences, and taking the flow average value and the pressure difference average value as the target flow rate and the target pressure difference corresponding to the airflow power point;

[0088] Step C60, if it is less than the maximum value of the quantity, determining whether the range results between the flow rates and the range results between the pressure differences are less than a preset range threshold;

[0089] Step C70, if it is less than the extreme difference threshold, then average the flow rates and the pressure differences respectively to obtain the target flow rate and the target pressure difference corresponding to the airflow power point;

[0090] Step C80, if it is not less than the extreme value threshold, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point, until the amount of the parameter information is greater than or equal to the maximum amount or the extreme value result is less than the extreme value threshold.

[0091] In this embodiment, specifically, the following steps are performed for each of the airflow power points:

[0092] At the airflow power point, parameter information measured by each sensor is obtained, the parameter information including flow rate and pressure difference, and then the parameter information is stored in a pre-initialized array, and then the number of parameter information in the array is compared with a preset minimum number. If the number of parameter information is less than the preset minimum number, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point, until the number of parameter information is not less than the preset minimum number. Furthermore, after determining that the amount of the parameter information is not less than a preset minimum amount, further determine whether the amount of the parameter information is greater than or equal to a preset maximum amount. If it is greater than or equal to the maximum amount, then the average value of each measured flow rate is used as the target flow rate of the airflow power point, and the average value of each measured pressure difference is used as the target pressure difference of the airflow power point. If it is less than the maximum amount, determine whether the range results between each flow rate and the range results between each pressure difference are less than a preset range threshold. If it is less than the range threshold, then average each flow rate and each pressure difference respectively to obtain the target flow rate and target pressure difference corresponding to the airflow power point. If it is not less than the range threshold, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point until the amount of the parameter information is greater than or equal to the maximum amount or the range result is less than the range threshold, and obtain the target flow rate and target pressure difference corresponding to the airflow power point.

[0093] In addition, refer to Fig. 9 , Fig. 9 FIG. 1 is a flow chart of reading flow and pressure difference in the automatic measurement method of the present application, wherein the sensor parameter represents the parameter information, the data X Nrepresents the pre-initialized array, N represents the number of the parameter information, Nmin represents the minimum number, Nmax represents the maximum number, and δx represents the extreme difference threshold. For example, the minimum number is 3, the maximum number is 20, and the extreme difference threshold is 0.1. The parameter information measured by each sensor is obtained for the first time. The current number of parameter information is 1, which is lower than the minimum number. Then, the parameter information measured by each sensor is continuously obtained until the current number of parameter information is 3. Then, the current number of parameter information is compared with the maximum number (3<20), and then the extreme difference results between each flow rate and the extreme difference results between each pressure difference are calculated. If it is less than the extreme difference threshold, each flow rate and each pressure difference are averaged to obtain the target flow rate and target pressure difference corresponding to the airflow power point. If it is not less than the extreme difference threshold, then return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point until the number of the parameter information is greater than or equal to the maximum number or the extreme difference result is less than the extreme difference threshold.

[0094] Through the above-mentioned scheme, the embodiment of the present application realizes multiple readings of the flow rate and pressure difference measured by each sensor at each airflow power point, and then takes the average value between the multiple flow rates as the target flow rate, and takes the average value between the multiple pressure differences as the target pressure difference, thereby improving the stability and accuracy of obtaining the flow rate and pressure difference at the airflow power point, thereby effectively improving the measurement accuracy of the sample to be tested.

[0095] Furthermore, the present application also provides a flow meter, which may include: a processor 1001, such as a CPU, a memory 1005, and a communication bus 1002. The communication bus 1002 is used to realize the connection and communication between the processor 1001 and the memory 1005. The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may optionally be a storage flow meter independent of the aforementioned processor 1001.

[0096] In addition, please refer to Fig.10 , Fig.10 : is a functional module schematic diagram of the sound absorbing material flow resistance measuring device of the present application. The present application also provides a sound absorbing material flow resistance measuring system, the sound absorbing material flow resistance measuring system comprising:

[0097] An acquisition module, used to acquire the device parameters of the flow resistance meter and the sample parameters of the sample to be tested;

[0098] A first calculation module, configured to automatically calculate the airflow operating range of the flow resistance meter based on the device parameters and a preset initial value of the detected airflow, and determine an array of airflows to be measured based on the airflow operating range;

[0099] A cyclic reading module, used for cyclically reading the target flow rate and target pressure difference corresponding to each airflow power point in the airflow array to be measured according to a preset stability parameter reading method;

[0100] The second calculation module is used to calculate the measurement result of the sample to be measured based on the sample parameters and the target flow rate and target pressure difference corresponding to each of the airflow power points.

[0101] Optionally, the first calculation module is further used for:

[0102] Obtaining the detected flow rate and detected pressure difference of the flow resistance meter at the initial value of the detected airflow;

[0103] Calculating a lower limit value of a detection flow range and an upper limit value of a detection flow range based on the pressure difference range, the flow range, the gas source range, the detected flow, the detected pressure difference and the detected airflow initial value;

[0104] The airflow operating range is determined based on the lower limit value of the detected flow range and the upper limit value of the detected flow range.

[0105] Optionally, the first calculation module is further used for:

[0106] Setting the maximum value in the gas source range as the target gas flow lower limit value, and presetting an end mark, wherein the end mark is initially set to a first mark value;

[0107] Determine whether the detected flow rate is lower than the lower limit of the flow rate range, and whether the detected pressure difference is lower than the lower limit of the pressure difference range;

[0108] If it is lower than the lower limit, the initial value of the detected airflow for the current number of detections is calculated based on the initial value of the detected airflow, the lower limit of the target airflow and the first preset change ratio;

[0109] If it is not lower than the lower limit, it is determined whether the detected flow exceeds the upper limit of the flow range, and whether the detected pressure difference exceeds the upper limit of the pressure difference range;

[0110] If the upper limit is exceeded, the detected airflow initial value is used as the target airflow lower limit of the current detection times, and the detected airflow initial value of the current detection times is calculated based on the detected airflow initial value and the second preset change ratio;

[0111] If it does not exceed the upper limit value, the detected airflow initial value is used as the target airflow lower limit value of the current detection times, and based on the target airflow lower limit value, the lower limit value of the pressure difference range, the lower limit value of the flow range, the detected flow, the detected pressure difference and the minimum value of the gas source range, the detected airflow initial value of the current detection times is calculated, and the end mark is set to the second mark value;

[0112] Determine whether the current detection number or the target airflow lower limit value of the current detection number meets the preset iteration end condition;

[0113] If not satisfied, then obtain the detection flow and detection pressure difference corresponding to the initial value of the detection airflow at the current detection number, and return to the execution step: determine whether the detection flow is lower than the lower limit value of the flow range, and whether the detection pressure difference is lower than the lower limit value of the pressure difference range, until the current detection number or the target airflow lower limit value of the current detection number meets the preset iteration end condition;

[0114] If it is satisfied, and the end mark is the second mark value, the lower limit value of the target airflow of the current detection times is used as the lower limit value of the detection flow range.

[0115] Optionally, the first calculation module is further used for:

[0116] Setting the minimum value in the gas source range as the target gas flow upper limit value, and presetting an end mark, wherein the end mark is initially set to a first mark value;

[0117] Determining whether the detected flow rate exceeds the upper limit of the flow rate range, and whether the detected pressure difference exceeds the upper limit of the pressure difference range;

[0118] If it exceeds the upper limit, the detected airflow initial value of the current detection number is calculated based on the detected airflow initial value, the target airflow upper limit value and the third preset change ratio;

[0119] If it does not exceed the upper limit value, then judging whether the detected flow rate is lower than the lower limit value of the flow rate range, and whether the detected pressure difference is lower than the lower limit value of the pressure difference range;

[0120] If it is lower than the lower limit, the detected airflow initial value is used as the target airflow upper limit value of the current detection number, and the detected airflow initial value of the current detection number is calculated based on the detected airflow initial value and the fourth preset change ratio;

[0121] If it is not lower than the lower limit, the detected airflow initial value is used as the target airflow upper limit value of the current detection times, and based on the upper limit value of the pressure difference range, the upper limit value of the flow range, the detected flow, the detected pressure difference and the detected airflow initial value, the detected airflow initial value of the current detection times is calculated, and the end mark is set to the second mark value;

[0122] Determine whether the current detection number or the target airflow upper limit value of the current detection number meets the preset iteration end condition;

[0123] If not satisfied, the detection flow and detection pressure difference corresponding to the initial value of the detection airflow of the current detection number are obtained, and the execution step is returned to: judging whether the detection flow exceeds the upper limit value of the flow range, and whether the detection pressure difference exceeds the upper limit value of the pressure difference range, until the current detection number or the target airflow upper limit value of the current detection number meets the preset iteration end condition;

[0124] If it is satisfied, and the end mark is the second mark value, the upper limit value of the target airflow of the current detection times is used as the upper limit value of the detection flow range.

[0125] Optionally, the sound absorbing material flow resistance measurement system is also used for:

[0126] A plurality of points are selected at the same interval in the airflow working range to form the airflow array to be measured.

[0127] Optionally, the cyclic reading module is further used for:

[0128] For each airflow power point in the airflow array to be measured, obtaining parameter information measured by each preset sensor at the airflow power point, wherein the parameter information includes the flow rate and the pressure difference;

[0129] Determining whether the amount of the parameter information is less than a preset minimum amount;

[0130] If the number is less than the minimum number, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point until the number of the parameter information is not less than the preset minimum number;

[0131] If it is not less than the minimum quantity, then it is determined that the quantity of the parameter information is greater than or equal to the preset maximum quantity;

[0132] If it is greater than or equal to the maximum value of the quantity, the flow average value between each flow rate and the pressure difference average value between each pressure difference are calculated respectively, and the flow average value and the pressure difference average value are used as the target flow rate and target pressure difference corresponding to the airflow power point;

[0133] If it is less than the maximum value of the quantity, then determine whether the range results between the flow rates and the range results between the pressure differences are less than a preset range threshold;

[0134] If it is less than the extreme difference threshold, then average the flow rates and the pressure differences to obtain the target flow rate and target pressure difference corresponding to the airflow power point;

[0135] If it is not less than the extreme value threshold, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point until the amount of the parameter information is greater than or equal to the maximum amount or the extreme value result is less than the extreme value threshold.

[0136] Optionally, the second calculation module is further used for:

[0137] Performing linear fitting processing on the target flow rate and the target pressure difference corresponding to each of the airflow power points to obtain a fitting result, and determining the flow resistance of the sample to be tested based on the fitting result;

[0138] Based on the flow resistance and the sample parameters, the specific flow resistance and the flow resistivity of the sample to be tested are calculated.

[0139] The specific implementation of the sound absorbing material flow resistance measurement system of the present application is basically the same as the various embodiments of the sound absorbing material flow resistance measurement method described above, and will not be repeated here.

[0140] An embodiment of the present application provides a storage medium, which is a computer-readable storage medium, and the computer-readable storage medium stores one or more programs, and the one or more programs can also be executed by one or more processors to implement the steps of any of the above-mentioned methods for measuring the flow resistance of sound-absorbing materials.

[0141] The specific implementation of the computer-readable storage medium of the present application is basically the same as the embodiments of the above-mentioned method for measuring the flow resistance of the sound-absorbing material, and will not be described in detail here.

[0142] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A method for measuring the flow resistance of sound absorbing materials, It is characterized in that The method is applied to a flow resistance meter, and the flow resistance measurement method of the sound absorbing material includes: Obtaining equipment parameters of the flow resistance meter and sample parameters of the sample to be tested; Based on the equipment parameters and the preset initial value of the detected airflow, the airflow working range of the flow resistance meter is automatically calculated, and based on the airflow working range, an array of airflows to be measured is determined; According to a preset stability parameter reading method, cyclically reading the target flow rate and target pressure difference corresponding to each airflow power point in the airflow array to be measured; Based on the sample parameters and the target flow rate and target pressure difference corresponding to each of the airflow power points, the measurement result of the sample to be tested is calculated; The device parameters include a pressure difference range, a flow range and a gas source range, and the step of automatically calculating the airflow working range based on the device parameters and a preset initial value of the detected airflow includes: Obtaining the detected flow rate and detected pressure difference of the flow resistance meter at the initial value of the detected airflow; Calculating a lower limit value of a detection flow range and an upper limit value of a detection flow range based on the pressure difference range, the flow range, the gas source range, the detected flow, the detected pressure difference and the detected airflow initial value; Determining the airflow operating range based on the lower limit value of the detected flow range and the upper limit value of the detected flow range; The step of cyclically reading the target flow rate and target pressure difference corresponding to each airflow power point in the airflow array to be measured according to the preset stability parameter reading method includes: For each airflow power point in the airflow array to be measured, obtaining parameter information measured by each preset sensor at the airflow power point, wherein the parameter information includes the flow rate and the pressure difference; Determining whether the amount of the parameter information is less than a preset minimum amount; If the number is less than the minimum number, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point until the number of the parameter information is not less than the preset minimum number; If it is not less than the minimum quantity, then it is determined that the quantity of the parameter information is greater than or equal to the preset maximum quantity; If it is greater than or equal to the maximum value of the quantity, the flow average value between each flow rate and the pressure difference average value between each pressure difference are calculated respectively, and the flow average value and the pressure difference average value are used as the target flow rate and target pressure difference corresponding to the airflow power point; If it is less than the maximum value of the quantity, then determine whether the range results between the flow rates and the range results between the pressure differences are less than a preset range threshold; If it is less than the extreme difference threshold, then average the flow rates and the pressure differences to obtain the target flow rate and target pressure difference corresponding to the airflow power point; If it is not less than the extreme difference threshold, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point, until the amount of the parameter information is greater than or equal to the maximum amount or the extreme difference result is less than the extreme difference threshold; Wherein, the measurement result includes the flow resistance, specific flow resistance and flow resistivity of the sample to be tested, and the step of calculating the measurement result of the sample to be tested based on the sample parameters and the target flow and target pressure difference corresponding to each of the airflow power points includes: Performing linear fitting processing on the target flow rate and the target pressure difference corresponding to each of the airflow power points to obtain a fitting result, and determining the flow resistance of the sample to be tested based on the fitting result; Based on the flow resistance and the sample parameters, the specific flow resistance and the flow resistivity of the sample to be tested are calculated.

2. The method for measuring the flow resistance of a sound absorbing material according to claim 1, It is characterized in that The step of calculating the lower limit value of the detection flow range based on the pressure difference range, the flow range, the gas source range, the detected flow, the detected pressure difference and the detected airflow initial value comprises: Setting the maximum value in the gas source range as the target gas flow lower limit value, and presetting an end mark, wherein the end mark is initially set to a first mark value; Determine whether the detected flow rate is lower than the lower limit of the flow rate range, and whether the detected pressure difference is lower than the lower limit of the pressure difference range; If it is lower than the lower limit, the initial value of the detected airflow for the current number of detections is calculated based on the initial value of the detected airflow, the lower limit of the target airflow and the first preset change ratio; If it is not lower than the lower limit, it is determined whether the detected flow exceeds the upper limit of the flow range, and whether the detected pressure difference exceeds the upper limit of the pressure difference range; If the upper limit is exceeded, the detected airflow initial value is used as the target airflow lower limit of the current detection times, and the detected airflow initial value of the current detection times is calculated based on the detected airflow initial value and the second preset change ratio; If it does not exceed the upper limit value, the detected airflow initial value is used as the target airflow lower limit value of the current detection times, and based on the target airflow lower limit value, the lower limit value of the pressure difference range, the lower limit value of the flow range, the detected flow, the detected pressure difference and the minimum value of the gas source range, the detected airflow initial value of the current detection times is calculated, and the end mark is set to the second mark value; Determine whether the current detection number or the target airflow lower limit value of the current detection number meets the preset iteration end condition; If not satisfied, then obtain the detection flow and detection pressure difference corresponding to the initial value of the detection airflow at the current detection number, and return to the execution step: determine whether the detection flow is lower than the lower limit value of the flow range, and whether the detection pressure difference is lower than the lower limit value of the pressure difference range, until the current detection number or the target airflow lower limit value of the current detection number meets the preset iteration end condition; If it is satisfied, and the end mark is the second mark value, the lower limit value of the target airflow of the current detection times is used as the lower limit value of the detection flow range.

3. The method for measuring flow resistance of a sound absorbing material according to claim 1, It is characterized in that The step of calculating the upper limit value of the detection flow range based on the pressure difference range, the flow range, the gas source range, the detected flow, the detected pressure difference and the detected airflow initial value comprises: Setting the minimum value in the gas source range as the target gas flow upper limit value, and presetting an end mark, wherein the end mark is initially set to a first mark value; Determining whether the detected flow rate exceeds the upper limit of the flow rate range, and whether the detected pressure difference exceeds the upper limit of the pressure difference range; If it exceeds the upper limit, the detected airflow initial value of the current detection number is calculated based on the detected airflow initial value, the target airflow upper limit value and the third preset change ratio; If it does not exceed the upper limit value, then judging whether the detected flow rate is lower than the lower limit value of the flow rate range, and whether the detected pressure difference is lower than the lower limit value of the pressure difference range; If it is lower than the lower limit, the detected airflow initial value is used as the target airflow upper limit value of the current detection number, and the detected airflow initial value of the current detection number is calculated based on the detected airflow initial value and the fourth preset change ratio; If it is not lower than the lower limit, the detected airflow initial value is used as the target airflow upper limit value of the current detection times, and based on the upper limit value of the pressure difference range, the upper limit value of the flow range, the detected flow, the detected pressure difference and the detected airflow initial value, the detected airflow initial value of the current detection times is calculated, and the end mark is set to the second mark value; Determine whether the current detection number or the target airflow upper limit value of the current detection number meets the preset iteration end condition; If not satisfied, the detection flow and detection pressure difference corresponding to the initial value of the detection airflow of the current detection number are obtained, and the execution step is returned to: judging whether the detection flow exceeds the upper limit value of the flow range, and whether the detection pressure difference exceeds the upper limit value of the pressure difference range, until the current detection number or the target airflow upper limit value of the current detection number meets the preset iteration end condition; If it is satisfied, and the end mark is the second mark value, the upper limit value of the target airflow of the current detection times is used as the upper limit value of the detection flow range.

4. The method for measuring flow resistance of a sound absorbing material according to claim 1, It is characterized in that The step of determining the airflow array to be measured based on the airflow working range comprises: A plurality of points are selected at the same interval in the airflow working range to form the airflow array to be measured.

5. A sound absorbing material flow resistance measurement system, It is characterized in that The sound absorbing material flow resistance measurement system comprises: An acquisition module, used to acquire device parameters of the flow resistance meter and sample parameters of the sample to be tested, wherein the device parameters include a pressure difference range, a flow range, and a gas source range; A first calculation module, configured to automatically calculate the airflow operating range of the flow resistance meter based on the device parameters and a preset initial value of the detected airflow, and determine an array of airflows to be measured based on the airflow operating range; A cyclic reading module, used for cyclically reading the target flow rate and target pressure difference corresponding to each airflow power point in the airflow array to be measured according to a preset stability parameter reading method; A second calculation module, used to calculate the measurement result of the sample to be tested based on the sample parameters and the target flow rate and target pressure difference corresponding to each of the airflow power points, wherein the measurement result includes the flow resistance, specific flow resistance and flow resistivity of the sample to be tested; The first calculation module is further used to obtain the detected flow and detected pressure difference of the flow resistance meter under the initial value of the detected airflow; based on the pressure difference range, the flow range, the gas source range, the detected flow, the detected pressure difference and the initial value of the detected airflow, calculate the lower limit value of the detected flow range and the upper limit value of the detected flow range; based on the lower limit value of the detected flow range and the upper limit value of the detected flow range, determine the airflow working range; The cyclic reading module is also used to obtain parameter information measured by each preset sensor at the airflow power point for each airflow power point in the airflow array to be measured, wherein the parameter information includes the flow rate and the pressure difference; determine whether the amount of the parameter information is less than the preset minimum amount; if it is less than the minimum amount, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point until the amount of the parameter information is not less than the preset minimum amount; if it is not less than the minimum amount, determine that the amount of the parameter information is greater than or equal to the preset maximum amount; if it is greater than or equal to the maximum amount, calculate the flow rates between each of the flow rates respectively. The average value and the average value of the pressure difference between each of the pressure differences, and use the flow average value and the pressure difference average value as the target flow and target pressure difference corresponding to the airflow power point; if it is less than the maximum value of the number, determine whether the range results between each of the flow rates and the range results between each of the pressure differences are less than the preset range threshold; if it is less than the range threshold, average each of the flow rates and each of the pressure differences respectively to obtain the target flow and target pressure difference corresponding to the airflow power point; if it is not less than the range threshold, return to the execution step: obtain the parameter information measured by each preset sensor at the airflow power point, until the number of the parameter information is greater than or equal to the maximum value or the range result is less than the range threshold; The second calculation module is also used to perform linear fitting processing on the target flow and target pressure difference corresponding to each of the airflow power points to obtain fitting results, and determine the flow resistance of the sample to be tested based on the fitting results; based on the flow resistance and the sample parameters, calculate the specific flow resistance and flow resistivity of the sample to be tested.

6. A flow resistance meter, It is characterized in that The flow resistance meter comprises: a memory, a processor and a sound absorbing material flow resistance measurement program stored in the memory. The sound absorbing material flow resistance measurement program is executed by the processor to implement the steps of the sound absorbing material flow resistance measurement method according to any one of claims 1 to 4.

7. A storage medium, wherein the storage medium is a computer-readable storage medium, It is characterized in that The computer-readable storage medium stores a sound absorbing material flow resistance measurement program, which is executed by a processor to implement the steps of the sound absorbing material flow resistance measurement method according to any one of claims 1 to 4.

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