CN114113333A - Method and related device for testing sound insulation performance of whole vehicle - Google Patents
Method and related device for testing sound insulation performance of whole vehicle Download PDFInfo
- Publication number
- CN114113333A CN114113333A CN202010886063.7A CN202010886063A CN114113333A CN 114113333 A CN114113333 A CN 114113333A CN 202010886063 A CN202010886063 A CN 202010886063A CN 114113333 A CN114113333 A CN 114113333A
- Authority
- CN
- China
- Prior art keywords
- target vehicle
- sound insulation
- insulation performance
- area
- square
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 94
- 238000012360 testing method Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005259 measurement Methods 0.000 claims description 43
- 238000004590 computer program Methods 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 8
- 238000010998 test method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 14
- 238000009826 distribution Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
Abstract
The method divides a tested area into three basic geometric areas according to the characteristics of a tested part of a target vehicle, wherein the three basic geometric areas are respectively of a line type, a face type and an angle type, and respectively correspond to a line segment with the length of a, a square with the side length of a and a hexahedron with the side length of a. And determining an internal measuring point of the target vehicle according to the type of the measured area, and obtaining the sound insulation performance of the measured area through the noise data of the internal and external measuring points. Therefore, the sound insulation performance of the tested area can be obtained under the condition that the whole vehicle is not damaged, the tested area cannot deform due to the fact that the corresponding tested area is not cut, the accuracy of the test result of the tested area can be improved, corresponding test environments do not need to be customized for different tested areas, workload during testing is reduced, and test cost is reduced.
Description
Technical Field
The invention relates to the technical field of noise measurement, in particular to a method and a related device for testing the sound insulation performance of a whole vehicle.
Background
Along with more and more attention paid to the comfort of the whole vehicle, the sound insulation level of the vehicle is more and more concerned by people. For example, the noise outside the vehicle increases with the increase of the vehicle speed, and when the vehicle runs on a highway, if the sound insulation performance of the whole vehicle is poor, the noise inside the vehicle can be irritated and uneasy, and the comfort is poor. Therefore, reducing the noise level in the vehicle and improving the acoustic environment in the vehicle have become a hot spot and a focus of research in the automotive field.
In the related art, in order to measure the sound insulation performance of each part of a vehicle, the vehicle needs to be destructively cut, and the cut part is placed in an anechoic chamber-reverberation chamber to be tested for the sound insulation performance, for example, when a front wall of the automobile is tested, the front wall of the automobile needs to be cut, a tool needs to be customized, and the sealing condition is higher, so that the workload is much larger than that of a flat plate material test. Meanwhile, the cutting operation causes irreversible damage to the vehicle, and the tested part can also deform during cutting, so that the measurement result of the sound insulation performance of the whole vehicle is influenced.
Disclosure of Invention
In order to solve the problems, the application provides a method and a related device for testing the sound insulation performance of a whole vehicle, which can obtain the distribution situation of the sound insulation performance of the whole vehicle and improve the measurement result of the sound insulation performance of the whole vehicle on the premise of not damaging the whole vehicle.
In a first aspect of the present application, a method for testing sound insulation performance of a whole vehicle is provided, where a target vehicle is placed in a reverberation room, and the method includes:
determining an internal measuring point of the target vehicle according to the measured area of the target vehicle; the measured area is a geometric area divided according to the characteristics of the measured part of the target vehicle, the geometric area is a line segment with the length of a, a square with the side length of a or a hexahedron with the side length of a, and the a is a natural number greater than 0;
acquiring internal noise data of the target vehicle at the internal measurement point;
obtaining external noise data of the target vehicle at a preset external test point;
and obtaining the sound insulation performance of the tested area according to the internal noise data and the external noise data.
Optionally, in the interior of the target vehicle, when the measured region is a square with a side length of a, the determining the internal measurement point of the target vehicle according to the measured region of the target vehicle includes:
determining the position with the length s as an internal measuring point of the target vehicle on the central normal of the measured area; wherein s satisfies the following condition:
optionally, in the interior of the target vehicle, when the measured area is a line segment with a length of a, the determining the internal measurement point of the target vehicle according to the measured area of the target vehicle includes:
the line segment is on the intersection line of any two adjacent surfaces in the target vehicle;
respectively establishing a first square and a second square on any two adjacent surfaces by taking the line segment as the side length, wherein the first square is vertical to the second square;
establishing a third square which is simultaneously vertical to the first square and the second square by taking the middle point of the line segment as a vertex; the side length of the third square is s, and the s meets the following conditions:
and determining the top points which are not adjacent to the middle point of the line segment as the internal measuring points of the target vehicle.
Optionally, in the interior of the target vehicle, when the measured area is a hexahedron with a side length of a, the determining the internal measurement point of the target vehicle according to the measured area of the target vehicle includes:
one vertex angle of the hexahedron is an angle formed by any three adjacent surfaces in the target vehicle;
determining a point on a body diagonal line where one corner of the hexahedron is located as an internal measurement point of the target vehicle, wherein the point is locatedThe distance from the internal measuring point to any one of the three adjacent surfaces is s, and the s meets the following condition:
optionally, the method further includes:
dividing the target vehicle into a plurality of detected regions;
obtaining sound insulation performance of the plurality of tested areas; wherein the s corresponding to the plurality of measured areas are equal;
and obtaining the sound insulation performance of the target vehicle according to the sound insulation performance of the plurality of tested areas.
Optionally, the value of s is 10 cm, 12.5cm, 16 cm, 20 cm, 25cm or 31.5 cm.
Optionally, the number of the preset external measuring points is 6, and the preset external measuring points are respectively located in front of, behind, on the left of, on the right of, above and below the target vehicle.
In a second aspect of the present application, there is provided a device for testing sound insulation performance of a whole vehicle, where a target vehicle is placed in a reverberation room, the device including: the device comprises a determining unit, a first acquiring unit, a second acquiring unit and a result unit.
The determination unit is used for determining an internal measuring point of the target vehicle according to a measured area of the target vehicle; the measured area is a geometric area divided according to the characteristics of the measured part of the target vehicle, the geometric area is a line segment with the length of a, a square with the side length of a or a hexahedron with the side length of a, and the a is a natural number greater than 0;
the first acquisition unit that acquires internal noise data of the target vehicle at the internal measurement point;
the second acquisition unit is used for acquiring external noise data of the target vehicle at a preset external measuring point;
and the result unit is used for obtaining the sound insulation performance of the tested area according to the internal noise data and the external noise data.
In a third aspect of the present application, there is provided a test apparatus for sound insulation performance of a finished vehicle, the apparatus comprising a processor and a memory:
the memory is used for storing a computer program and transmitting the computer program to the processor;
the processor is used for executing the test method for the sound insulation performance of the whole vehicle according to the instructions in the computer program.
In a fourth aspect of the present application, a computer-readable storage medium is provided, where the computer-readable storage medium is used to store a computer program, and the computer program is used to execute any one of the above-mentioned methods for testing sound insulation performance of a finished automobile.
Compared with the prior art, the technical scheme of the application has the advantages that:
the embodiment of the application provides a method for testing the sound insulation performance of a whole vehicle, which comprises the following steps of firstly, determining an internal test point of a target vehicle according to a tested area of the target vehicle; the measured area is a geometric area divided according to the characteristics of the measured part of the target vehicle, the geometric area is a line segment with the length of a, a square with the side length of a or a hexahedron with the side length of a, and a is a natural number greater than 0. Next, external noise data of the target vehicle is obtained at a preset external measurement point. And finally, obtaining the sound insulation performance of the tested area according to the internal noise data and the external noise data.
The measured area is divided into three basic geometric areas, namely a line type, a face type and an angle type according to the characteristics of the measured part of the target vehicle, and the three basic geometric areas respectively correspond to a line segment with the length of a, a square with the side length of a and a hexahedron with the side length of a. And determining an internal measuring point of the target vehicle according to the type of the measured area, and obtaining the sound insulation performance of the measured area through the noise data difference of the internal and external measuring points. Therefore, the sound insulation performance of the tested area can be obtained under the condition that the whole vehicle is not damaged, the tested area cannot deform due to the fact that the corresponding tested area is not cut, the accuracy of the test result of the tested area can be improved, corresponding test environments are not required to be customized for different tested areas, workload during testing is reduced, and test cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for testing sound insulation performance of a finished automobile provided by the application;
FIG. 2 is a schematic diagram of a target vehicle area under test provided by an embodiment of the present application;
FIG. 3 is a schematic view of another target vehicle area under test provided by an embodiment of the present application;
FIG. 4 is a schematic view of another target vehicle area under test provided by an embodiment of the present application;
FIG. 5 is a schematic view of a target vehicle exterior layout microphone provided by an embodiment of the present application;
FIG. 6 is a schematic view of a geometric region provided in an embodiment of the present application;
FIG. 7 is a schematic view of another geometric region provided by an embodiment of the present application;
FIG. 8 is a schematic view of yet another geometry region provided by an embodiment of the present application;
FIG. 9 is a schematic view of yet another geometric region provided by an embodiment of the present application;
FIG. 10 is a schematic view of another geometric region provided by an embodiment of the present application;
FIG. 11 is a schematic diagram of a measurement result provided by an embodiment of the present application;
FIG. 12 is a schematic diagram of another measurement result provided by an embodiment of the present application;
FIG. 13 is a schematic diagram of a test device for sound insulation performance of a whole vehicle according to an embodiment of the present application;
FIG. 14 is a structural diagram of a test device for sound insulation performance of a finished automobile according to an embodiment of the present application;
fig. 15 is a schematic diagram of a computer-readable storage medium according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to test the sound insulation performance of the whole vehicle, the test environment is described first.
When the sound insulation performance of the whole vehicle is measured, the vehicle is generally placed in an acoustic laboratory for measurement, and the acoustic laboratory is generally divided into a full anechoic chamber, a half anechoic chamber, a mixed anechoic chamber and the like. In a full anechoic chamber or a half anechoic chamber, a sound source is placed in a vehicle, in a reverberation chamber, the sound source is arranged outside the vehicle, then some measuring points in the vehicle and some measuring points outside the vehicle are selected, microphones are placed at the measuring points, and the sound insulation performance of the whole vehicle is obtained through the data difference between the microphones in the vehicle and outside the vehicle.
The reverberation room is selected as the test environment in the present application due to the high cost of the total or semi-anechoic room. And closing a door and a window of the whole vehicle (hereinafter referred to as a target vehicle) of the detected vehicle and putting the whole vehicle into a reverberation room. The application does not limit the placement position of the vehicle, for example, the vehicle is placed in the middle of the reverberation room, so that the target vehicle uniformly receives sound, and the measurement result of the sound insulation performance of the whole target vehicle is improved.
The following is a description of sound sources arranged in a reverberation room. Sound sources are placed in the corners of the reverberation room so that they fill the entire reverberation room. The number of sound sources to be placed is not limited in the present application, and for example, the sound sources may be placed in one corner, two corners, or four corners. The sound source is placed at a height of 1-3 m from the ground and 1-3 m from two wall surfaces at a corner, preferably, the sound source can be simultaneously at the same distance from the two wall surfaces, for example, the sound source is simultaneously 1m from the two wall surfaces and 1m from the ground, so that the sound source is filled in the whole reverberation room. The present application does not specifically limit the type of sound source, and a volume sound source may be employed, for example. The volume sound source can continuously and stably emit white noise, single-frequency noise, pink noise and other different types of noise with certain sound power. The target vehicle is thus in a sound field that totally reflects sound energy at all boundaries and is sufficiently diffuse therein to form a diffuse field with a uniform sound energy density throughout and a random distribution in all directions of propagation.
The following describes a method for testing the sound insulation performance of a target vehicle with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a flowchart of a method for testing sound insulation performance of a finished automobile, which may include S101-S104.
S101: determining an internal measuring point of the target vehicle according to the measured area of the target vehicle; the measured area is a geometric area divided according to the characteristics of the measured part of the target vehicle, the geometric area is a line segment with the length of a, a square with the side length of a or a hexahedron with the side length of a, and the a is a natural number greater than 0.
In order to make the technical personnel in the technical field understand the scheme better, the target vehicle is abstracted into geometric figures, for example, corner areas such as the upper left side of the front side or the upper left side of the rear side in the interior of the target vehicle can be abstracted into hexahedrons, even a cube and other simplified abstract models.
When the sound insulation performance of each part of the target vehicle is measured, each part to be measured is located in one measured area, and the target vehicle can be divided into different types of measured areas according to the characteristics of each part. The measured area can be divided into three basic types in geometric form, namely, a face, a line and an angle. The three basic types are described below.
The first method comprises the following steps: and (5) kneading.
When the sound insulation performance of parts such as a door, a roof and a glass of a target vehicle is measured, the parts such as the door, the roof and the glass are all plane areas, so that the plane areas can be divided into area to be measured of a plane type, and the area to be measured can be represented by a square with the side length of a or a plane area consisting of a plurality of squares with the side length of a.
Referring to fig. 2, the figure is a schematic view of a target vehicle detected area provided in the embodiment of the present application. The measured area shown in fig. 2 is an area where a window on the front side of the target vehicle is located, and is represented by a square having a length a.
And the second method comprises the following steps: a wire.
When the sound insulation performance of the components such as the A column and the upper part of the door frame of the target vehicle is measured, the components such as the A column and the upper part of the door frame are all linear regions, so the linear regions can be divided into linear regions to be measured, and the regions to be measured can be represented by line segments with the length of a or long line segments consisting of a plurality of line segments with the length of a.
Referring to fig. 3, another schematic diagram of a target vehicle detected area is provided in the embodiment of the present application. The measured area shown in fig. 3 is a position where a plane where a rear door of the target vehicle is located intersects with a plane where a rear window is located, and is represented by a line segment having a length a.
And the third is that: and (4) an angle.
When sound insulation performance of a region such as a front upper left side or a rear upper left side of the interior of a target vehicle is measured, since the front upper left side or the rear upper left side of the interior is a corner region, the corner region may be divided into a corner type region to be measured, and the region to be measured may be represented by a rectangular parallelepiped having a length of a.
Fig. 4 is a schematic view of another target vehicle detected area provided in the embodiment of the present application. The region to be measured shown in fig. 4 is a rear upper right region in the interior of the target vehicle, that is, a region where the rear side door is located and three surfaces of the rear side windshield and the roof intersect each other, and is represented by a hexahedron having a side length of a.
Different interior points of the target vehicle can be determined from different types of measured regions of the target vehicleThe internal measuring point is positioned in the vehicle and is at a distance s from the measured area or a square related to the measured area, s is a natural number greater than 0, and the relation between s and a is
S102: internal noise data of the target vehicle is acquired at the internal measurement point.
The present application is not particularly limited to a method of obtaining target vehicle interior noise data at interior stations. For example, a microphone is installed at an internal measurement point, and internal noise data of the subject vehicle is obtained by the microphone.
S103: external noise data of the target vehicle is obtained at a preset external measurement point.
The present application is not particularly limited to the method of obtaining the target vehicle interior noise data at the external measurement points. For example, a microphone is installed at an external measurement point, and external noise data of the subject vehicle is obtained by the microphone.
The number and the position of the external measuring points are not particularly limited in the application, and can be set by a person skilled in the art according to actual needs.
For example, in order to obtain representative noise data representing sound energy in a reverberant room, microphones are mounted one at each of the front, rear, left, right, upper, and lower sides of a target vehicle. Referring to fig. 5, a schematic diagram of a target vehicle exterior layout microphone according to an embodiment of the present application is shown.
In this case, the upper sensor and the lower sensor of the target vehicle shown in fig. 5 are projected on a single point, and the target vehicle lower sensor is not shown in the drawing. The microphone under the target vehicle may be placed half way up the height of the ground from the underside of the target vehicle and in the center of the target vehicle. The microphones located at the positions above, behind, left, right, and above the target vehicle may be located at positions 1m to 3m from the surface of the target vehicle while being located at positions not less than 1m from the wall of the reverberation room.
S104: and obtaining the sound insulation performance of the tested area according to the internal noise data and the external noise data.
The sound insulation performance of the tested area of the target vehicle is the difference value of the external noise data and the internal noise data of the target vehicle. As shown in the following formula:
IL＝Lpouter cover-LpInner part (1)
Wherein IL represents the sound insulation performance of the tested area, LpOuter coverExternal noise data, Lp, representing the area under testInner partInternal noise data representing the region under test.
The embodiment of the application provides a method for testing the sound insulation performance of a whole vehicle, which comprises the following steps of firstly, determining an internal test point of a target vehicle according to a tested area of the target vehicle; the measured area is a geometric area divided according to the characteristics of the measured part of the target vehicle, the geometric area is a line segment with the length of a, a square with the side length of a or a hexahedron with the side length of a, and a is a natural number greater than 0. Next, external noise data of the target vehicle is obtained at a preset external measurement point. And finally, obtaining the sound insulation performance of the tested area according to the internal noise data and the external noise data.
The measured area is divided into three basic geometric areas, namely a line type, a face type and an angle type according to the characteristics of the measured part of the target vehicle, and the three basic geometric areas respectively correspond to a line segment with the length of a, a square with the side length of a and a hexahedron with the side length of a. And determining an internal measuring point of the target vehicle according to the type of the measured area, and obtaining the sound insulation performance of the measured area through the noise data difference of the internal and external measuring points. Therefore, the sound insulation performance of the tested area can be obtained under the condition that the whole vehicle is not damaged, the corresponding tested area is not cut, the tested area cannot deform, the accuracy of the test result of the tested area can be improved, the corresponding test environment for different tested areas does not need to be customized, the workload during testing is reduced, and the test cost is reduced.
In order to make the technical solutions provided by the embodiments of the present application clearer, the following describes, with reference to fig. 6 to 10, determining internal test points according to different test areas provided by the embodiments of the present application.
The region to be measured is divided into three types, and the determination methods of the three types are described in detail below.
The first method comprises the following steps: and (5) kneading.
In the interior of the target vehicle, when the measured area is a square with a side length of a, the measured part is included in the square, for example, the square shown in fig. 2 includes a front side glass area of the target vehicle.
Referring to fig. 6, a schematic diagram of a geometric region provided in an embodiment of the present application is shown.
On the normal to the center point o of the square, a point p is found, which is at a distance s from the square. When the point p is far away from the square, more noise reaching the point p through the region outside the square region is received; when the point p is close to the square, noise that has reached the point p in the area of the square cannot be completely received. Through a plurality of experiments of the applicant, the embodiment of the application provides a method capable of correctly reflecting the distance of the noise reaching the point p through the square area, namely s satisfies the condition that
If the measured area is longer and larger or the sound insulation performance of continuous different parts is required to be obtained, a plurality of squares with the side length of a can be spliced for measurement. The following description will be made by taking a region to be measured composed of a square with six sides a as an example.
Referring to fig. 7, a schematic view of another geometric region provided by embodiments of the present application is shown.
Six squares with the side length of a form a region to be measured, and each square corresponds to one internal measuring point. E.g. o1The measuring point corresponding to the square is p1，o2The measuring point corresponding to the square is p2And so on. The distance s between each measuring point and the corresponding square is the same, and the condition that s meets is
And the second method comprises the following steps: a wire.
In the interior of the target vehicle, when the measured area is a line segment with a length of a, the line segment is a part of an intersection line of any two adjacent surfaces in the target vehicle, for example, a line segment on an intersection line of a plane where a right side door of the target vehicle is located and a plane where a rear side window of the target vehicle is located as shown in fig. 3.
Reference is made to fig. 8, which is a schematic illustration of yet another geometric region provided by an embodiment of the present application.
The line segment is an intersection line of a first face and a second face of the target vehicle, the first face and the second face are two adjacent faces, a first square is established in the first face by taking the line segment as the side length, a second square is established in the second face by taking the line segment as the side length, and the first square is perpendicular to the second square. And establishing a third square op' pp which is simultaneously vertical to the first square and the second square by taking the middle point o of the line segment as a vertex, and taking the vertex p which is not adjacent to the middle point o of the line segment as an internal measuring point of the target vehicle. Wherein the side length of the third square is s, and s satisfies the condition
The distance between the inner measuring point p and two adjacent squares, namely the distance between the inner measuring point p and two adjacent surfaces of the target vehicle, is s, and the projection of the inner measuring point p is at the position of the midpoint o of the line segment.
If the measured area is long or the sound insulation performance of continuous different parts is required to be obtained, a plurality of line segments with the length of a can be spliced for measurement. The following description will be given taking as an example a region to be measured composed of two line segments having a length of a.
Reference is made to fig. 9, which is a schematic illustration of yet another geometric region provided by an embodiment of the present application.
And two line segments with the length of a form a measured area, and each line segment corresponds to one internal measuring point. For example, the lower line segment corresponds to a measurement point p1The measuring point corresponding to the upper line segment is p2. The distance s between each measuring point and the corresponding square is the same, and the condition that s meets is
And the third is that: and (4) an angle.
In the interior of the target vehicle, when the measured area is a hexahedron with a side length of a, the hexahedron is an area formed by any three adjacent surfaces in the target vehicle, and one vertex angle of the hexahedron is an angle formed by the three adjacent surfaces, for example, a plane where a right side door of the target vehicle is located, a plane where a rear side window is located, and a plane where a roof of the target vehicle is located, which are intersected to form an angle area.
Referring to fig. 10, another schematic view of a geometric region provided in an embodiment of the present application is shown.
One vertex angle area of the hexahedron is an angle area formed by a first surface, a second surface and a third surface of the target vehicle, and the first surface, the second surface and the third surface are three adjacent surfaces and coincide with the three adjacent surfaces of the square. Three superposed surfaces of squares are taken as an example for explanation, a first square is established in a first surface by taking the vertex of a vertex angle as a center, a second square is established in a second surface, a third square is established in a third surface, the first square, the second square and the third square are mutually vertical, the side lengths of the first square, the second square and the third square are a, and a hexahedron with the side length of a is formed. And determining the point on the body diagonal where the top angle is positioned as an internal measuring point. The distance from the internal measuring point to any one of the three adjacent surfaces is s, the distance from the internal measuring point p to the three adjacent squares is s, namely, the distances from the three adjacent surfaces of the target vehicle are s, and the s meets the following conditions:
in order to measure the overall sound insulation performance of the target vehicle, the target vehicle may be divided into a plurality of regions to be measured. For example, in order to reflect the sound insulation capability of different areas of the target vehicle, complete measurements can be made according to six surfaces, the important sides and the corner areas, of the front, back, upper, lower, left and right of the target vehicle. Then, the three basic types of tested areas can be divided into units with basically proper sizes, uniform distance measurement s is selected, and the sound insulation performance of each tested area is obtained respectively. And finally, obtaining the sound insulation performance of the target vehicle according to the sound insulation performance of the plurality of tested areas.
The value of s is not specifically limited in the present application, and those skilled in the art can set the value according to actual needs. For example, through multiple experiments of the applicant, the value of s can be sequentially selected from 10 cm, 12.5cm, 16 cm, 20 cm, 25cm or 31.5 cm, and compared with the traditional test set according to experience, the value can obtain a more accurate result by using a smaller number of measuring points.
The embodiment of the present application does not specifically limit the manner in which the test result of the target vehicle is obtained from the test results of the plurality of regions under test. For example, taking equation (1) as an example, for a measured area represented by an internal measurement point of a target vehicle, an a-weighting sound pressure level Lp and/or a Z-weighting sound pressure level Lp of the measured area can be obtained; a-weighted and/or Z-weighted noise spectra lp (f) of the region under test (spectra may be selected from octaves, 1/3 octaves, other octaves or line spectra). The frequency spectrum of the sound insulation quantity at a certain position can be described in a form of a table or a spectrogram.
By adopting the measuring method, the data obtained by testing the same distance measurement s can be used for comparing the performance states of a certain part before and after improvement or the same positions of different vehicles, and the distribution condition of the sound insulation quantity in the whole vehicle can be obtained. Therefore, the method can be used for establishing indexes, judging the qualification and checking and accepting the performance in the development process. Meanwhile, different measuring points adopt the same test rule, and can be compared with each other and then used as contribution analysis for an improvement scheme for refining the sound insulation performance of the vehicle.
The following description is continued with a test procedure to describe the method for testing the sound insulation performance of the whole vehicle provided by the present application.
The first step is as follows: preparation of the test
A target vehicle and a sound source are arranged in the reverberation room, the sound source in the embodiment has 7 gears, and the corresponding sound power gears are white noise with the noise power of-35 dB, -30dB, -25dB, -20dB, -15dB, -10dB and-5 dB respectively.
The second step is that: microphones disposed outside and inside the subject vehicle.
The target vehicle is gridded up, down, left, right, front, and rear 6 surfaces by using a grid of 25cm, s is selected to be 12.5cm, the internal measurement points are determined by the method described in the above embodiment, and microphones in the corresponding areas are arranged at the internal measurement points.
An external microphone is respectively arranged on the upper, lower, left, right, front and rear 6 surfaces of the target vehicle.
The third step: external noise data and internal noise data of a target vehicle are acquired.
And respectively opening the sound source to different gears, and simultaneously collecting the noise of different measuring points inside and outside the train at different sound power gears.
Referring to fig. 11, a schematic diagram of a measurement result provided in an embodiment of the present application is shown.
Fig. 11 is only one form of recording that is easy to view, and is not the only form of recording. For another example, refer to fig. 12, which is a schematic diagram of another measurement result provided in the embodiment of the present application, and represents a spectrogram of an acoustic insulation amount at a certain position.
FIG. 11 records the value of the weighted sound pressure level A inside and outside the vehicle when the sound power of the sound source is-35 dB. Since the outside of the car is a reverberant field, the sound pressure levels at several test locations are substantially identical, with only one numerical value representing 46.02 dB.
The fourth step: the sound insulation performance of the target vehicle is obtained.
For the calculation of the sound insulation amount for each position, for example, 14 measurement points are arranged in the right side portion of the vehicle, and 14 pieces of data are obtained.
For example, to calculate the amount of sound insulation at the first row and first column on the right side, the calculation can be performed by equation (1), ILRight 11＝LpOuter cover-LpInner part46.02-25.90-20.12 db (a). The amount of sound insulation at each measurement position can be calculated in the same way. And finally, obtaining the complete sound insulation quantity distribution condition of the target vehicle.
The above results represent the weighted sound insulation amount a of each measurement point, and if different frequencies are calculated respectively, the sound insulation capacity of each measurement point in different frequency bands is obtained, see fig. 12, and meanwhile, the different sound insulation performance of each position can also be represented by the sound insulation performance curve of the point in different frequencies, which is not described in detail herein.
The embodiment of the application provides a test method for sound insulation performance of a whole vehicle, and also provides a test device for sound insulation performance of a whole vehicle, as shown in fig. 13, which is a schematic diagram of the test device for sound insulation performance of a whole vehicle provided by the embodiment of the application.
The device for testing the sound insulation performance of the whole vehicle comprises a determining unit 1301, a first acquiring unit 1302, a second acquiring unit 1303 and a result unit 1304.
The determining unit 1301 is used for determining an internal measuring point of the target vehicle according to a measured area of the target vehicle; the measured area is a geometric area divided according to the characteristics of the measured part of the target vehicle, the geometric area is a line segment with the length of a, a square with the side length of a or a hexahedron with the side length of a, and the a is a natural number greater than 0;
the first acquisition unit 1302, configured to acquire internal noise data of the target vehicle at the internal measurement point;
the second acquiring unit 1303, configured to acquire external noise data of the target vehicle at a preset external survey point;
and the result unit 1304 is used for obtaining the sound insulation performance of the tested area according to the internal noise data and the external noise data.
As a possible implementation manner, the result unit 1304 is specifically configured to determine, in the interior of the target vehicle, when the measured area is a square with a side length of a, an internal measurement point of the target vehicle at a position with a length of s on a center normal of the measured area; wherein s satisfies the following condition:
as a possible implementation manner, the result unit 1304 is specifically configured to, in the interior of the target vehicle, when the detected area is a line segment with a length a, determine that the line segment is located in any two adjacent line segments of the target vehicleOn the intersection line of the faces; respectively establishing a first square and a second square on any two adjacent surfaces by taking the line segment as the side length, wherein the first square is vertical to the second square; establishing a third square which is simultaneously vertical to the first square and the second square by taking the middle point of the line segment as a vertex; the side length of the third square is s, and the s meets the following conditions:
and determining the top points which are not adjacent to the middle point of the line segment as the internal measuring points of the target vehicle.
As a possible implementation manner, the result unit 1304 is specifically configured to, in the interior of the target vehicle, when the measured area is a hexahedron with a side length of a, a vertex angle of the hexahedron is a corner formed by any three adjacent surfaces in the target vehicle; determining a point on a body diagonal where one vertex of the hexahedron is located as an internal measurement point of the target vehicle, wherein a distance from the internal measurement point to any one of the three adjacent surfaces is s, and the s satisfies the following condition:
as a possible implementation manner, the device further comprises a whole vehicle sound insulation performance acquisition unit, which is used for dividing the target vehicle into a plurality of detected areas; obtaining sound insulation performance of the plurality of tested areas; wherein the s corresponding to the plurality of measured areas are equal; and obtaining the sound insulation performance of the target vehicle according to the sound insulation performance of the plurality of tested areas.
As a possible implementation manner, the value of s is 10 cm, 12.5cm, 16 cm, 20 cm, 25cm or 31.5 cm.
As a possible implementation, the number of the preset external measuring points is 6, which are respectively located at the front, the rear, the left, the right, the upper and the lower of the target vehicle.
The embodiment of the application provides a test device for sound insulation performance of a whole vehicle, and the test device divides a tested area into three basic geometric areas according to the characteristics of a tested part of a target vehicle, wherein the three basic geometric areas are respectively of a line type, a face type and an angle type, and respectively correspond to a line segment with the length of a, a square with the side length of a and a hexahedron with the side length of a. And determining an internal measuring point of the target vehicle according to the type of the measured area, and obtaining the sound insulation performance of the measured area through the noise data difference of the internal and external measuring points. Therefore, the sound insulation performance of the tested area can be obtained under the condition that the whole vehicle is not damaged, the corresponding tested area is not cut, the tested area cannot deform, the accuracy of the test result of the tested area can be improved, the corresponding test environment for different tested areas does not need to be customized, the workload during testing is reduced, and the test cost is reduced.
The embodiment of the present application provides a device for testing sound insulation performance of a finished automobile, referring to fig. 14, which shows a structure diagram of the device for testing sound insulation performance of a finished automobile provided in the embodiment of the present application, as shown in fig. 14, the device includes a processor 1410 and a memory 1420:
the memory 1410 is used for storing a computer program and transmitting the computer program to the processor;
the processor 1420 is configured to execute any one of the above methods for testing the sound insulation performance of the entire vehicle according to the instructions in the computer program.
An embodiment of the present application provides a computer-readable storage medium, referring to fig. 15, which shows a schematic diagram of a computer-readable storage medium provided in an embodiment of the present application, as shown in fig. 15, the computer-readable storage medium is used for storing a computer program 1510, and the computer program 1510 is used for executing any one of the above-mentioned methods for testing sound insulation performance of a finished vehicle.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above-described apparatus embodiments are merely illustrative, and the units and modules described as separate components may or may not be physically separate. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (10)
1. A method for testing sound insulation performance of a whole vehicle is characterized in that a target vehicle is placed in a reverberation room, and comprises the following steps:
determining an internal measuring point of the target vehicle according to the measured area of the target vehicle; the measured area is a geometric area divided according to the characteristics of the measured part of the target vehicle, the geometric area is a line segment with the length of a, a square with the side length of a or a hexahedron with the side length of a, and the a is a natural number greater than 0;
acquiring internal noise data of the target vehicle at the internal measurement point;
obtaining external noise data of the target vehicle at a preset external test point;
and obtaining the sound insulation performance of the tested area according to the internal noise data and the external noise data.
2. The test method according to claim 1, wherein, in the interior of the target vehicle, when the region under test is a square with a side length of a, the determining the interior test point of the target vehicle from the region under test of the target vehicle includes:
determining the position with the length s as an internal measuring point of the target vehicle on the central normal of the measured area; wherein s satisfies the following condition:
3. the test method according to claim 1, wherein the determining an inside test point of the target vehicle from the measured area of the target vehicle when the measured area is a line segment having a length a in the inside of the target vehicle comprises:
the line segment is on the intersection line of any two adjacent surfaces in the target vehicle;
respectively establishing a first square and a second square on any two adjacent surfaces by taking the line segment as the side length, wherein the first square is vertical to the second square;
establishing a third square which is simultaneously vertical to the first square and the second square by taking the middle point of the line segment as a vertex; the side length of the third square is s, and the s meets the following conditions:
and determining the top points which are not adjacent to the middle point of the line segment as the internal measuring points of the target vehicle.
4. The test method according to claim 1, wherein the determining an inside test point of the target vehicle from the measured area of the target vehicle when the measured area is a hexahedron having a side length of a in the inside of the target vehicle includes:
one vertex angle of the hexahedron is an angle formed by any three adjacent surfaces in the target vehicle;
determining a point on a body diagonal where one vertex of the hexahedron is located as an internal measurement point of the target vehicle, wherein a distance from the internal measurement point to any one of the three adjacent surfaces is s, and the s satisfies the following condition:
5. the method of claim 1, further comprising:
dividing the target vehicle into a plurality of detected regions;
obtaining sound insulation performance of the plurality of tested areas; wherein the s corresponding to the plurality of measured areas are equal;
and obtaining the sound insulation performance of the target vehicle according to the sound insulation performance of the plurality of tested areas.
6. The method of any one of claims 2 to 5, wherein s is 10 cm, 12.5cm, 16 cm, 20 cm, 25cm or 31.5 cm.
7. The method according to any one of claims 1-5, wherein the number of preset exterior stations is 6, located respectively in front of, behind, to the left of, to the right of, above and below the target vehicle.
8. A test device for sound insulation performance of a whole vehicle is characterized in that a target vehicle is placed in a reverberation room, and comprises: a determination unit, a first acquisition unit, a second acquisition unit and 1301.
The determination unit is used for determining an internal measuring point of the target vehicle according to a measured area of the target vehicle; the measured area is a geometric area divided according to the characteristics of the measured part of the target vehicle, the geometric area is a line segment with the length of a, a square with the side length of a or a hexahedron with the side length of a, and the a is a natural number greater than 0;
the first acquisition unit that acquires internal noise data of the target vehicle at the internal measurement point;
the second acquisition unit is used for acquiring external noise data of the target vehicle at a preset external measuring point;
and the result unit is used for obtaining the sound insulation performance of the tested area according to the internal noise data and the external noise data.
9. The utility model provides a test equipment for whole car sound insulation performance which characterized in that, test equipment includes treater and memory:
the memory is used for storing a computer program and transmitting the computer program to the processor;
the processor is used for executing the test method for the sound insulation performance of the whole vehicle as claimed in any one of claims 1 to 7 according to the instructions in the computer program.
10. A computer-readable storage medium for storing a computer program for executing the method for testing sound insulation performance of a finished vehicle according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010886063.7A CN114113333A (en) | 2020-08-28 | 2020-08-28 | Method and related device for testing sound insulation performance of whole vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010886063.7A CN114113333A (en) | 2020-08-28 | 2020-08-28 | Method and related device for testing sound insulation performance of whole vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114113333A true CN114113333A (en) | 2022-03-01 |
Family
ID=80375043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010886063.7A Pending CN114113333A (en) | 2020-08-28 | 2020-08-28 | Method and related device for testing sound insulation performance of whole vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114113333A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115666A (en) * | 2012-07-03 | 2013-05-22 | 重庆长安汽车股份有限公司 | Method of testing and evaluating sound insulation property of finished automobile based on reverberation room |
| CN103175699A (en) * | 2011-12-23 | 2013-06-26 | 南车青岛四方机车车辆股份有限公司 | Noise transmission route testing method for railway vehicle |
-
2020
- 2020-08-28 CN CN202010886063.7A patent/CN114113333A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175699A (en) * | 2011-12-23 | 2013-06-26 | 南车青岛四方机车车辆股份有限公司 | Noise transmission route testing method for railway vehicle |
| CN103115666A (en) * | 2012-07-03 | 2013-05-22 | 重庆长安汽车股份有限公司 | Method of testing and evaluating sound insulation property of finished automobile based on reverberation room |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108963356A (en) | A kind of devices and methods therefor obtaining the distribution of inside lithium ion cell state | |
| Li et al. | Propagation of sound in long enclosures | |
| CN109541034A (en) | Train body siding sound insulation property test method based on vehicle semianechoic room environment | |
| Albert et al. | Ground effects for aircraft noise certification | |
| CN114113333A (en) | Method and related device for testing sound insulation performance of whole vehicle | |
| US20160223495A1 (en) | Method for the non-destructive ultrasonic testing of a part by echo analysis | |
| Bradley et al. | Comparison of measured and computer-modeled objective parameters for an existing coupled volume concert hall | |
| CN109342571B (en) | Noise reduction performance test method for sound insulation cover | |
| CN208297685U (en) | A kind of non-destructive testing device obtaining the distribution of inside lithium ion cell state | |
| Pődör et al. | Testing some aspects of usability of crowdsourced smartphone generated noise maps | |
| Forssén et al. | Statistics of A-weighted road traffic noise levels in shielded urban areas | |
| Schröder et al. | Open measurements of edge diffraction from a noise barrier scale model | |
| Dolezal et al. | Akustik Center Austria-New research and testing competence for timber constructions | |
| Sakamoto et al. | Experimental study on calculation model of road traffic noise radiated from semi-underground roads | |
| Orr | Characterization of the center for acoustics and vibration (CAV) reverberation chamber | |
| Bogema et al. | High-frequency time domain source path contribution: from engine test bench data to cabin interior sounds | |
| Minck et al. | Array based acoustic power measurement, Renault pass-by noise | |
| Hickling et al. | Determining Sound Power for Automotive Applications | |
| Lutgendorf et al. | Numerical simulation of the sound reflection effects of noise barriers in near and far field | |
| Piippo | Noise in street canyons with asymmetrical cross sections | |
| Kingan et al. | An experimental investigation of ground board mounted microphones for outdoor noise measurement | |
| Bian | Outdoor sound propagation modeling based on an efficient Gaussian beam tracing method | |
| Pinhède et al. | Active Control of the Diffracted Field by the Reflecting Wall of a Semi-Anechoic Room | |
| Navarro et al. | A physically-based model for fast prediction of the reverberation time in room acoustic applications | |
| Didier et al. | Numerical study of the impact of reverberation room shape, diffusers, and source positions on low-frequency sound absorption measurements |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |