Method for measuring noise reduction effect of noise reduction damping steel I-steel component

Abstract

The invention relates to a method for measuring the noise reduction effect of a noise reduction damping steel I-steel component. According to the method for measuring the noise reduction effect of the noise reduction damping steel I-shaped steel components, a first sound level meter and a second sound level meter are arranged at the two ends of the two I-shaped steel components in the first direction respectively; the middle of a first flange plate at one end of a first sound level meter of the I-shaped steel component, the edge of the first flange plate in the third direction and the middle of a web are knocked through force application pieces provided with force sensors, and the first sound level meter and a second sound level meter can obtain noise decibels close to a knock point and away from the knock point respectively; average values can be obtained through multiple times of knocking on the same position of the same I-shaped steel component, the difference values of the average values of noise decibels measured through multiple times of knocking on the same positions of the two I-shaped steel components are compared, and data comparison is conducted according to common I-shaped steel components. And evaluating the noise level, namely the noise reduction performance, caused by vibration, impact and the like in the use process of the I-shaped steel member made of the novel material.

Description

Technical Field

[0001] The present application relates to the technical field of building structure engineering, and in particular to a method for measuring the noise reduction effect of noise-reducing damping steel I-beam components. Background Art

[0002] As the primary load-bearing material in building structures, I-beams are widely used in various engineering projects. However, during use, I-beams can easily generate noise due to factors such as vibration and impact, impacting the surrounding environment and people's quality of life.

[0003] A new type of noise-reducing damping steel has been developed in the marine industry. Through its special alloy composition and processing technology, this steel can absorb and reduce vibration-induced noise to a certain extent. To explore its application in the construction industry, it is necessary to effectively measure and evaluate the noise reduction effect of I-beam components made of this steel.

[0004] Existing methods for measuring the sound insulation of acoustic buildings and building components include laboratory measurements of floor impact sound insulation using five hammers arranged in a straight line to strike the floor slab. Four sound level meters are placed beneath the slab to measure the sound pressure levels at different impact positions. However, existing building codes and standards primarily focus on measuring the sound insulation performance of building components such as walls and slabs, specifically assessing their ability to block sound transmission. However, these measurement methods are not suitable for evaluating the noise levels caused by vibration, impact, and other factors during the use of I-beam components, i.e., their noise reduction performance. Summary of the Invention

[0005] Based on this, it is necessary to provide a method for measuring the noise reduction effect of I-beam components using noise-reducing damping steel, in order to address the problem that existing acoustic building and building component sound insulation measurement methods are not suitable for evaluating the noise level caused by vibration, impact, etc. during use of I-beam components, that is, the noise reduction performance.

[0006] A method for measuring the noise reduction effect of a noise-reducing and damping steel I-beam component is used to measure the noise reduction performance of the damping steel I-beam component relative to an ordinary steel I-beam component under external excitation. The I-beam component includes: a first flange plate, a second flange plate, and a web plate. The first flange plate and the second flange plate are arranged opposite to each other and extend along a first direction. The web plate extends along the first direction. The web plate is connected to the first flange plate and the second flange plate on both sides along the second direction. The first direction, the second direction, and a third direction are perpendicular to each other. The third direction is the thickness direction of the web plate. The method for measuring the noise reduction effect of the noise-reducing and damping steel I-beam component includes the following steps:

[0007] S100: A first sound level meter is placed at the first end of each of the first flange plates of the two I-beam members along the first direction; a second sound level meter is placed at the second end of each of the first flange plates of the two I-beam members along the first direction; the first end and the second end are the two ends of the I-beam member along the first direction;

[0008] S200: Using a force-applying member equipped with a force sensor, striking the middle portion of the first end of the first flange plate of each I-beam member along the third direction, the edge portion of the first end of the first flange plate along the third direction, and the middle portion of the first end of the web plate, and collecting noise decibels measured by the first sound level meter and the second sound level meter and mechanical data measured by the force sensor for each strike;

[0009] S300: Repeat step S200 multiple times, and gradually increase the striking force when striking the same striking position each time;

[0010] S400: Calculate the average noise decibel value at each striking position of the two I-beam components; obtain the difference between the average noise decibel values of the two I-beam components and conduct comparative analysis.

[0011] In one embodiment, the step S400 in the noise reduction effect measurement method of the noise reduction damping steel I-beam component includes:

[0012] S410: fitting noise decibels measured by the first sound level meter and the second sound level meter at the same position of two I-beam members with different knocking forces to obtain fitting curves;

[0013] S420: Calculating, by fitting a curve, an average of the noise decibels measured by the first sound level meter and the second sound level meter at the same position of the two I-beam members with different striking forces;

[0014] S430: Compare the difference between the average values of noise decibels measured by multiple tapping on the same position of the two I-beam members.

[0015] In one embodiment, the noise decibels measured by the first sound level meter and the second sound level meter at the same position of two I-beam members with different knocking forces are fitted by the least squares method to obtain a fitting curve, wherein the fitting curve is a straight line, and the goal is to find a straight line from all the measured noise decibel data to the fitting curve so that the sum of the squares of the vertical distances of all data points to the fitting curve is minimized; the fitting curve is a linear trend line: ;

[0016] Where y is the dependent variable (the noise level in dB generated by the tapping), x is the independent variable (the magnitude of the external stimulus, N), m is the slope, and b is the intercept.

[0017] In one embodiment, the slope and intercept of the fitted curve are calculated as follows:

[0018] By adjusting m and b, the residual sum of squares SSR is minimized:

[0019] ;

[0020] Among them, y i is the experimental measured value, is the linear trend line predicted value;

[0021] Taking partial derivatives of SSR with respect to m and b respectively and setting the derivatives to zero, we can get:

[0022] :

[0023] Solving, we can get the slope: ,intercept: .

[0024] In one embodiment, after step S410, the following steps are further performed:

[0025] S411; respectively introduce the determination coefficient to analyze the fitting results of each fitting curve. If the determination coefficient is greater than 0.9, the fitting result is good. If the determination coefficient is less than 0.9, re-measure and fit to obtain the fitting curve, and analyze the fitting results again until the determination coefficient is greater than or equal to 0.9.

[0026] In one embodiment, the coefficient of determination R 2 The analysis method is:

[0027] ;

[0028] Among them SS res is the residual sum of squares: , SS bot is the total sum of squares: ,y i is the experimental measured value; is the linear trend line predicted value; It is the average value of the experimental measured values.

[0029] In one embodiment, each I-beam member is struck at the same position 30-40 times, and the force of each strike increases successively.

[0030] In one embodiment, the force of multiple strikes on the same position of each I-beam member is in the range of 10-120N.

[0031] In one embodiment, the damping steel I-beam member and the ordinary steel I-beam member have the same cross-sectional dimensions and lengths along the first direction.

[0032] In one embodiment, the noise level of the environment in which the damping steel I-beam member and the ordinary steel I-beam member are located is less than the minimum noise level generated by the I-beam member during subsequent knocking.

[0033] A noise reduction effect measurement method for noise-reducing damping steel I-beam components is used to measure the noise reduction performance of damping steel I-beam components relative to ordinary steel I-beam components under external excitation. A second sound level meter is placed at the second end of the first flange plates of the two I-beam components along the first direction, the first end and the second end are the two ends of the I-beam components along the first direction, and a force-applying member equipped with a force sensor is used to knock on the middle part of the first end of the first flange plate of each I-beam component along the third direction, the edge part of the first end of the first flange plate along the third direction, and the middle part of the first end of the web plate along the second direction, so that the noise decibels close to the knocking point (i.e., the first end) and away from the knocking point (i.e., the second end) can be obtained respectively by the first sound level meter and the second sound level meter. Multiple sets of data can be obtained by knocking on the same position of the same I-beam component multiple times and Take the average value, obtain the difference between the average noise decibel values of the two I-beam components and conduct comparative analysis. Specifically, the average noise decibel value of multiple knocks on the same position of the same I-beam component can be calculated with the knocking force as the horizontal coordinate and the noise decibel value as the vertical coordinate. Then, compare the average noise decibel value of the first sound level meter after knocking on the same position of the two I-beam components, the average noise decibel value measured by the second sound level meter after knocking on the same position of the two I-beam components, and the average noise decibel value generated by knocking on the two I-beam components at the same position. A comprehensive analysis of the same comparison method for the three positions can also be performed, so as to compare the data based on ordinary steel I-beam components and evaluate the noise level caused by vibration, impact, etc. during use of I-beam components made of new materials, that is, the noise reduction performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of measurement when a force-applying member strikes the middle and edge of the first flange plate according to one embodiment.

[0035] Figure 2 This is a schematic diagram of measurement when a force-applying member strikes the middle of a web according to an embodiment.

[0036] Figure 3 A side view of an I-beam member according to an embodiment.

[0037] Figure 4 A side view of the I-beam member is shown, showing the noise volume and striking force measured by a first sound level meter when striking the middle of the first flange plate of a damping steel I-beam member and a common steel I-beam member in one embodiment, as well as a fitting curve.

[0038] Figure 5A side view of the I-beam member showing the noise volume and striking force measured by a second sound level meter when striking the middle of the first flange plate of a damping steel I-beam member and a common steel I-beam member according to an embodiment, as well as a fitting curve.

[0039] Figure 6 This is a side view of the I-beam member showing the noise volume and striking force measured by a first sound level meter and a fitting curve when striking the first flange edge of a damping steel I-beam member and a common steel I-beam member according to an embodiment.

[0040] Figure 7 A side view of the I-beam member is shown, which shows the noise volume and striking force measured by a second sound level meter when striking the edge of the first flange plate of a damping steel I-beam member and a common steel I-beam member according to an embodiment, as well as a fitting curve.

[0041] Figure 8 A side view of the I-beam member showing the noise volume and striking force measured by a first sound level meter when striking the web of a damping steel I-beam member and a common steel I-beam member according to an embodiment, as well as a fitting curve.

[0042] Figure 9 A side view of the I-beam member showing the noise volume and striking force measured by a second sound level meter when striking the web of a damping steel I-beam member and a normal steel I-beam member according to an embodiment, as well as a fitting curve.

[0043] Description of Figure Numbers:

[0044] 10-I-steel components;

[0045] 100-first flange plate;

[0046] 200-second flange plate;

[0047] 300-belly plate;

[0048] 20-force applying member; 21-first sound level meter; 22-second sound level meter; 23-strike point;

[0049] 31-damping steel; 32-ordinary steel;

[0050] OX-first direction; OY-second direction; OZ-third direction. DETAILED DESCRIPTION

[0051] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0052] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0053] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0054] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0055] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0056] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0057] See Figure 1 and Figure 2 , Figure 1 The diagram shows a measurement diagram of the force applying member 20 striking the middle and edge of the first flange plate 100 in one embodiment of the present application. Figure 2 A measurement schematic diagram is shown when the force-applying member 20 in an embodiment of the present application strikes the middle of the web 300. The I-beam member 10 includes: a first flange plate 100, a second flange plate 200, and a web 300. The first flange plate 100 and the second flange plate 200 are arranged opposite to each other and extend along a first direction OX. The web 300 extends along the first direction OX. The web 300 is connected to the first flange plate 100 and the second flange plate 200 on both sides along the second direction OY. The first direction OX, the second direction OY, and the third direction OZ are perpendicular to each other. The third direction OZ is the thickness direction of the web 300. A noise reduction effect measurement method for a noise reduction and damping steel I-beam member provided in an embodiment of the present application is used to measure the noise reduction performance of a damping steel 31 I-beam member 10 relative to an ordinary steel 32 I-beam member 10 under external excitation. The noise reduction effect measurement method for a noise reduction and damping steel I-beam member includes the following steps:

[0058] S100: A first sound level meter 21 is placed on the first end of the first flange plates 100 of the two I-beam members 10 along the first direction OX; a second sound level meter 22 is placed on the second end of the first flange plates 100 of the two I-beam members 10 along the first direction OX; the first end and the second end are the two ends of the I-beam member along the first direction OX.

[0059] S200: Use the force-applying member 20 equipped with a force sensor to strike the middle of the first end of the first flange plate 100 of each I-beam member 10 along the third direction OZ, the edge of the first end of the first flange plate 100 along the third direction OZ, and the middle of the first end of the web 300 along the second direction OY, and collect the noise decibels measured by the first sound level meter 21 and the second sound level meter 22 for each strike and the mechanical data measured by the force sensor.

[0060] S300: Repeat step S200 multiple times, and gradually increase the striking force when striking the same striking position each time.

[0061] S400: Calculating the average noise decibel value at each striking position of the two I-beam members 10; obtaining the difference between the average noise decibel values of the two I-beam members 10 and conducting comparative analysis.

[0062] In the above embodiment, a second sound level meter 22 is placed at the second end of the first flange plate 100 of the two I-beam members 10 along the first direction OX, and the first end and the second end are the two ends of the I-beam member along the first direction OX. The force applying member 20 equipped with a force sensor is used to strike the middle part of the first end of the first flange plate 100 of each I-beam member 10 along the third direction OZ, the edge part of the first end of the first flange plate 100 along the third direction OZ, and the middle part of the first end of the web 300 along the second direction OY. Thus, the noise decibels close to the striking point 23 (i.e., the first end) and far from the striking point 23 (i.e., the second end) can be obtained respectively by the first sound level meter 21 and the second sound level meter 22. By repeatedly striking the same position of the same I-beam member 10, multiple sets of data can be obtained and the average value is taken to obtain the noise decibels of the two I-beam members. 10 and conduct comparative analysis. Specifically, the average noise decibel value of multiple knocks on the same position of the same I-beam component 10 can be calculated with the knocking force as the horizontal coordinate and the noise decibel as the vertical coordinate. Then, the average noise decibel value of the first sound level meter 21 after the two I-beam components 10 are knocked at the same position can be compared, and the average noise decibel value measured by the second sound level meter 22 after the two I-beam components 10 are knocked at the same position can be compared. After comparing the average noise decibel value generated by the knocking of the two I-beam components 10 at the same position, a comprehensive analysis of the same comparison method for the three positions can be performed, so as to compare the data based on the ordinary steel 32 I-beam component 10, and evaluate the noise level caused by vibration, impact, etc. during use of the I-beam component 10 made of new materials, that is, the noise reduction performance.

[0063] In one embodiment, the step S400 in the method for measuring the noise reduction effect of a noise reduction damping steel I-beam component includes:

[0064] S410: fitting the noise decibels measured by the first sound level meter 21 and the second sound level meter 22 at the same position and different knocking forces of the two I-beam members 10 to obtain a fitting curve.

[0065] S420: Calculate the average noise decibels measured by the first sound level meter 21 and the second sound level meter 22 at different knocking forces at the same position of the two I-beam members 10 by fitting the curve.

[0066] S430: Compare the difference between the average values of the noise decibels measured by repeatedly tapping the same position of the two I-beam members 10 .

[0067] Specifically, the noise decibels measured by the first sound level meter 21 and the second sound level meter 22 at the same position and different knocking forces of the two I-beam members 10 are fitted by the least squares method to obtain a fitting curve. The fitting curve is a straight line. The goal is to find a straight line from all the measured noise decibel data to the fitting curve so that the sum of the squares of the vertical distances of all data points to the fitting curve is minimized. The fitting curve is a linear trend line: ,

[0068] Where y is the dependent variable (the noise level in dB generated by the tapping), x is the independent variable (the magnitude of the external stimulus, N), m is the slope, and b is the intercept.

[0069] In one embodiment, the slope and intercept of the fitted curve are calculated as follows:

[0070] By adjusting m and b, the residual sum of squares SSR is minimized:

[0071] ,

[0072] Among them, y i is the experimental measured value, is the linear trend line forecast value,

[0073] Taking partial derivatives of SSR with respect to m and b respectively and setting the derivatives to zero, we can get:

[0074] :

[0075] Solving, we can get the slope: ,intercept: .

[0076] After step S410, you need to do the following:

[0077] S411, respectively introduce the determination coefficient to analyze the fitting results of each fitting curve. If the determination coefficient is greater than 0.9, the fitting result is good. If the determination coefficient is less than 0.9, re-measure and fit to obtain the fitting curve, and analyze the fitting results again until the determination coefficient is greater than or equal to 0.9.2 The analysis method is:

[0078] ,

[0079] Among them SS res is the residual sum of squares: , SS bot is the total sum of squares: ,y i is the experimental measured value, is the linear trend line forecast value, It is the average value of the experimental measured values.

[0080] In one embodiment, each I-beam member 10 is struck at the same position 30-40 times, and the force of each strike increases successively.

[0081] In one embodiment, the force of hitting the same position of each I-beam member 10 multiple times ranges from 10 to 120N.

[0082] In one embodiment, the cross-sectional dimensions and the lengths along the first direction OX of the I-beam component 10 made of the damping steel 31 and the I-beam component 10 made of the ordinary steel 32 are the same.

[0083] In one embodiment, the noise of the environment in which the damping steel 31 I-beam component 10 and the ordinary steel 32 I-beam component 10 are located is less than the minimum noise generated by the I-beam component 10 during subsequent knocking.

[0084] According to the noise reduction effect measurement method of the noise reduction damping steel I-beam component of the present application, the noise reduction effect of the damping steel I-beam component 10 was measured with ordinary steel 32 as a reference. The structural parameters of the I-beam component 10 of the present application are:

[0085]

[0086] See Figure 3 , where H is the distance between the first flange panel 100 and the second flange panel 200 along the second direction OY, B is the width of the first flange panel 100 and the second flange panel 200 along the third direction OZ, tf is the thickness of the first flange panel 100 and the second flange panel 200, tw is the thickness of the web 300, and L is the length in the first direction OX. 30 strikes were performed at each location with a strike force ranging from 10 to 120 N. The measured data and the fitting curve for each set of data are referenced as follows: Figure 5-9After evaluating the fitting results, the R2 value was 0.92-0.97, with an average value of 0.94. The trend line obtained by data fitting was used for subsequent data comparison analysis. The average values of the noise generated at the near end (i.e., the noise measured by the first sound level meter 21) and the noise generated at the far end (i.e., the noise measured by the second sound level meter 22) when the tapping point 23 was in the middle of the first flange plate 100, the edge of the first flange plate 100, and the middle of the web 300, as well as the noise difference at both ends were obtained as follows:

[0087]

[0088] The noise volume directly generated by the damping steel 31 at three different excitation points is 3.4-3.7dB smaller than that of the ordinary steel 32, with an average of 3.6dB; the noise volume generated at the far end is 4.6-5dB smaller than that of the ordinary steel 32, with an average of 4.8dB. Because the speed of sound propagation through solids is greater than that of air, the noise reduction amplitude at the far and near ends can be considered as the noise manifestation after the sound propagates along the steel structure. Therefore, for the two specimens in this test, the noise difference at both ends of the damping steel 31 specimen at three different excitation points is 0.9-1.6dB smaller than that of the ordinary steel 32, with an average of 1.2dB. This shows that the noise directly generated by vibration at the excitation point is smaller than that of the ordinary steel 32. At the same time, the noise volume reduced after propagating through the specimen to the far end is higher than that of the ordinary steel 32, indicating that the damping steel 31 has a good noise reduction effect.

[0089] Currently, there are established methods and standards for measuring the sound insulation of building components, such as the Chinese national standard GB / T 19889 series. These standards provide a basis for measuring and evaluating the sound insulation performance of building components such as walls and panels. However, these standards are not applicable to evaluating the noise level caused by vibration, impact, and other factors during use of the I-beam component 10, namely, its noise reduction performance. Therefore, the standards do not contain comparable measurement schemes and data results. The various technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as these combinations of technical features do not conflict, they should be considered within the scope of this specification.

[0090] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for measuring the noise reduction effect of a noise-reducing damping steel I-beam component, which is used to measure the noise reduction performance of a damping steel I-beam component relative to an ordinary steel I-beam component under external excitation, characterized in that: The I-beam component includes: a first flange plate, a second flange plate, and a web plate. The first flange plate and the second flange plate are arranged opposite to each other and extend along a first direction. The web plate extends along the first direction. The web plate is connected to the first flange plate and the second flange plate on both sides along the second direction. The first direction, the second direction, and the third direction are perpendicular to each other. The third direction is the thickness direction of the web plate. The noise reduction effect measurement method of the noise reduction and damping steel I-beam component includes the following steps: S100: A first sound level meter is placed on the first end of each of the first flange plates of the two I-beam members along the first direction; a second sound level meter is placed on the second end of each of the first flange plates of the two I-beam members along the first direction; the first end and the second end are the two ends of the I-beam member along the first direction. S200: Using a force-applying member equipped with a force sensor, striking the middle portion of the first end of the first flange plate of each I-beam member along the third direction, the edge portion of the first end of the first flange plate along the third direction, and the middle portion of the first end of the web plate, and collecting noise decibels measured by the first sound level meter and the second sound level meter and mechanical data measured by the force sensor for each strike; S300: Repeat step S200 multiple times, and gradually increase the striking force when striking the same striking position each time; S400: Calculate the average noise decibel value at each striking position of the two I-beam components; obtain the difference between the average noise decibel values of the two I-beam components and conduct comparative analysis.

2. The noise reduction effect measurement method of the noise reduction damping steel I-beam component according to claim 1 is characterized in that: The step S400 in the noise reduction effect measurement method of the noise reduction damping steel I-beam component includes: S410: fitting noise decibels measured by the first sound level meter and the second sound level meter at the same position of two I-beam members with different knocking forces to obtain fitting curves; S420: Calculating, by fitting a curve, an average of the noise decibels measured by the first sound level meter and the second sound level meter at the same position of the two I-beam members with different striking forces; S430: Compare the difference between the average values of noise decibels measured by multiple tapping on the same position of the two I-beam members.

3. The method for measuring the noise reduction effect of a noise reduction and damping steel I-beam member according to claim 2, characterized in that: The noise decibels measured by the first sound level meter and the second sound level meter at the same position and different knocking forces on two I-beam components are fitted by the least squares method to obtain a fitting curve. The fitting curve is a straight line. The goal is to find a straight line for all the measured noise decibel data so that the sum of the squares of the vertical distances from all data points to the fitting curve is minimized; the fitting curve is a linear trend line: ; Where y is the dependent variable (the noise level in dB generated by the tapping), x is the independent variable (the magnitude of the external stimulus, N), m is the slope, and b is the intercept.

4. The method for measuring the noise reduction effect of a noise reduction and damping steel I-beam member according to claim 3 is characterized in that: The slope and intercept of the fitted curve are calculated as follows: By adjusting m and b, the residual sum of squares SSR is minimized: ； Among them, y i is the experimental measured value, is the linear trend line predicted value; Taking partial derivatives of SSR with respect to m and b respectively and setting the derivatives to zero, we can get: ： Solving, we can get the slope: ,intercept: .

5. The method for measuring the noise reduction effect of a noise reduction and damping steel I-beam member according to claim 3, characterized in that: After step S410, you need to do the following: S411; respectively introduce the determination coefficient to analyze the fitting results of each fitting curve. If the determination coefficient is greater than 0.9, the fitting result is good. If the determination coefficient is less than 0.9, re-measure and fit to obtain the fitting curve, and analyze the fitting results again until the determination coefficient is greater than or equal to 0.

9.

6. The method for measuring the noise reduction effect of a noise reduction and damping steel I-beam member according to claim 5, characterized in that: The coefficient of determination R 2 The analysis method is: ； Among them SS res is the residual sum of squares: , SS bot is the total sum of squares: ,y i is the experimental measured value; is the linear trend line predicted value; is the average value of the experimental measured values.

7. The method for measuring the noise reduction effect of a noise reduction and damping steel I-beam member according to claim 2, characterized in that: Each I-beam component is struck 30-40 times at the same position, and the force of each strike increases successively.

8. The method for measuring the noise reduction effect of a noise reduction and damping steel I-beam member according to claim 7, characterized in that: The force range of multiple strikes on the same position of each I-beam member is 10-120N.

9. The method for measuring the noise reduction effect of a noise reduction and damping steel I-beam member according to claim 1, characterized in that: The damping steel I-beam component and the ordinary steel I-beam component have the same cross-sectional dimensions and lengths along the first direction.

10. The method for measuring the noise reduction effect of a noise reduction and damping steel I-beam member according to claim 1, characterized in that: The noise of the environment in which the damping steel I-beam component and the ordinary steel I-beam component are located is less than the minimum noise generated by the I-beam component during subsequent knocking.

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