CN112051336A - Test system and test method for distinguishing type and thickness of automobile glass - Google Patents
Test system and test method for distinguishing type and thickness of automobile glass Download PDFInfo
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- CN112051336A CN112051336A CN202010823042.0A CN202010823042A CN112051336A CN 112051336 A CN112051336 A CN 112051336A CN 202010823042 A CN202010823042 A CN 202010823042A CN 112051336 A CN112051336 A CN 112051336A
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- 239000011521 glass Substances 0.000 title claims abstract description 155
- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 238000010998 test method Methods 0.000 title claims abstract description 14
- 230000005284 excitation Effects 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000005341 toughened glass Substances 0.000 claims abstract description 10
- 239000002390 adhesive tape Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims description 55
- 238000001228 spectrum Methods 0.000 claims description 30
- 239000000523 sample Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000005340 laminated glass Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 17
- 238000001816 cooling Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000003872 anastomosis Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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- 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
- G01N29/22—Details, e.g. general constructional or apparatus details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0237—Thin materials, e.g. paper, membranes, thin films
Abstract
The invention relates to a test system and a test method for distinguishing the type and thickness of automobile glass, wherein the system comprises an excitation system consisting of a loudspeaker and an acoustic shield, the loudspeaker is arranged at the front end of the acoustic shield, the acoustic shield comprises a right-angle-shaped flanging, a layer of double-sided adhesive tape is bonded on the surface of the flanging, the excitation system is fixed on one side of toughened glass, and a sound intensity tester is arranged on the other side of the glass and has the same axis with the acoustic shield. The test method comprises the following steps: manufacturing an excitation system, arranging a bench test, testing the bench test, establishing a database, testing the state of the whole vehicle, judging the type of glass and judging the thickness of the glass. The test system and the test method for distinguishing the type and the thickness of the automobile glass adopt the acoustic method principle, can distinguish the type and the thickness of the glass under the condition that the glass is not disassembled in the whole automobile state, and have the advantages of simple method, small workload and no damage to a test object.
Description
Technical Field
The invention belongs to the technical field of glass thickness detection, and particularly relates to a test system and a test method for distinguishing the type and thickness of automobile glass.
Background
At present, when the front windshield glass, the rear windshield glass, the triangular window glass, the skylight glass and other glass of an automobile are subjected to competitive product alignment, the section is difficult to view, and the type and the thickness of the glass are difficult to distinguish. Generally, the glass needs to be detached from a vehicle, part of the glass needs to damage a coated sealing strip, the type of the glass is distinguished by observing the section structure and measuring the density and the loss factor of the glass, and the thickness of the glass is measured by a vernier caliper or a micrometer. However, the disassembly work is large, and the test object is difficult to recover after being damaged.
The prior art discloses a control method and a control device for glass thickness detection, wherein the control device for glass thickness detection comprises the following steps: the transmission assembly is used for transmitting glass to be detected, the feeding assembly is used for moving the glass to be detected to the detection platform, the detection platform is used for detecting the thickness of the glass, the discharging assembly moves out the detected glass on the detection platform, and the control method for detecting the thickness of the glass comprises the following steps: controlling the feeding assembly to move the glass to be detected on the transmission assembly to the detection platform; acquiring a thickness parameter of the glass detected by the detection platform; and controlling the blanking assembly to move out the glass on the detection platform. It will wait to detect glass through the material loading subassembly and remove to testing platform on, after having detected glass thickness, control unloading subassembly shifts out glass, and whole journey does not need manual operation, provides the degree of automation of the control process that glass thickness detected, avoids the manual work to detect and the very low problem of in-process efficiency of transport glass. However, the method mainly aims at single glass detection and is not suitable for detecting the state of the whole vehicle.
The prior art also discloses a glass thickness measuring device, which comprises a controller, a display, a cooling box and a glass thickness detector; a cooling channel is arranged in the cooling box, and the glass thickness detector is arranged in the cooling box; the display and the glass thickness detector are both electrically connected with the controller. This glass thickness measurement device measures glass thickness through set up glass thickness detector in the cooler bin to set up cooling channel in the cooler bin and be used for letting in cooling medium and cool off, in order to protect the probe end of glass thickness detector, make it not influenced by ambient temperature or glass temperature in the measurement process, and then guaranteed the measurement accuracy of glass thickness detector. This patent is mainly solved the thickness calliper and is carried out the problem that there is great measuring error in manual measurement to be not applicable to whole car state and survey glass thickness.
With the acceleration of automobile development speed, how to acquire the information on the type and thickness of the standard automobile glass without disassembling the automobile has become an important issue for developing the NVH performance of the automobile.
The prior art discloses a glass thickness detection device and a glass thickness detection method, which comprise the following steps: a housing having a bottom surface portion capable of being in contact with a surface of a glass to be measured, the bottom surface portion having a planar shape and being transparent to light; two light sources, which are oppositely arranged in the shell with a specified distance, and can emit detection light to the bottom surface part; a photoelectric detection unit which is formed by arranging a plurality of light detection units, is arranged in the shell, and can receive the reflected light from the glass to be detected; and a glass thickness calculating unit for calculating a thickness parameter of the glass to be measured based on the detection information outputted from the photoelectric detecting unit. Although the method can test the thickness of the glass under the condition that the glass is not disassembled in the whole vehicle state, the thickness is detected by a photoelectric detection method, the method process is complicated, and the workload is large.
Disclosure of Invention
The invention aims to provide a test system for distinguishing the type and thickness of automobile glass and a test method for distinguishing the type and thickness of the automobile glass, so as to overcome the defects that the glass needs to be detached from an automobile, the workload is high, and a test object is difficult to recover after being damaged in the conventional test method.
The purpose of the invention is realized by the following technical scheme:
a test system for discriminating the type and thickness of automotive glass includes an excitation system;
the excitation system consists of a loudspeaker 1 and a sound insulation cover 2;
the loudspeaker 1 is arranged at the front end of the sound insulation cover 2, the sound insulation cover 2 comprises a right-angle flange 3, and a layer of double faced adhesive tape 4 is adhered to the surface of the flange 3;
the excitation system is fixed on one side of toughened glass 6 with the thickness of 3.2mm, and the sound intensity tester 5 is arranged on the other side of the glass 6 and is coaxial with the sound insulation cover 2.
Further, the sound insulation cover 2 is cylindrical and made of steel.
Further, the sound insulation cover 2 is 2mm in thickness, 200mm in height and 50mm in bottom surface diameter.
Further, the width of the flange 3 is 30 mm.
Further, the distance between the probe of the sound intensity tester 5 and the glass 6 is 150 mm.
Further, the sound intensity tester 5 frequency resolution is set to 1 Hz.
A test method for discriminating between type and thickness of automotive glass comprising the steps of:
A. manufacturing an excitation system: the excitation system mainly comprises a loudspeaker 1 and a sound insulation cover 2, wherein the sound insulation cover 2 is cylindrical and made of steel, the thickness of the sound insulation cover is 2mm, the height of the sound insulation cover is 200mm, the diameter of the bottom surface of the sound insulation cover is 50mm, the sound insulation cover 2 comprises a right-angle flange 3, the width of the flange 3 is 30mm, and the surface of the sound insulation cover is bonded with a layer of double-sided adhesive tape 4;
B. bench test arrangement: in the anechoic chamber, the excitation system is fixed on one side of toughened glass with the thickness of 3.2mm, the sound intensity tester is arranged on the other side of the glass 6, and a probe of the sound intensity tester is 150mm away from the glass and is coaxial with the sound insulation cover 2;
C. bench test: the loudspeaker 1 continuously emits narrow-band white noise of 400Hz to 4000Hz, the frequency resolution of the sound intensity tester is set to be 1Hz, the sound intensity level can be considered to reach a stable state after 3 seconds, and the sound intensity test is carried out at the moment to obtain a sound intensity level frequency spectrum of 400Hz to 4000 Hz;
D. establishing a database: testing the sound intensity levels of different types of glass 6 with different thickness specifications on a rack by the same method, wherein the types of the glass 6 comprise 4 types including toughened glass, acoustic laminated glass, common laminated glass and resin glass; in each test, the sound production of the loudspeaker and the size of the sound insulation cover are kept consistent, the distance between the sound intensity probe and the surface of the glass 6 is consistent, and a database is accumulated;
E. and (3) testing the whole vehicle state: in the anechoic chamber, an excitation system is fixed on the inner side of glass 6, a sound intensity tester 5 is arranged on the outer side, and the sound intensity level frequency spectrum of the glass 6 to be tested at 400 Hz-4000 Hz is tested by the same method;
F. judging the type of the glass: and analyzing the sound intensity level frequency spectrum of 1600Hz to 4000Hz, calculating the difference between the sound intensity level frequency spectrum and the sound intensity level frequency spectrum of all different types of glass 6 with different thickness specifications in the database, then calculating the standard deviation of the frequency spectrum difference, finding out the minimum value of the standard deviation, checking the corresponding glass type and thickness, and determining the glass type of the glass 6 measured under the state of the whole vehicle.
G. Judging the thickness of the glass: after the type of the glass is confirmed, analyzing the sound level frequency spectrum of 400 Hz-1600 Hz, calculating the difference with the sound level frequency spectrum of the glass with different thicknesses of the type of the database, then calculating the standard deviation of the frequency spectrum difference, finding out the minimum value of the standard deviation, checking the corresponding glass thickness, and confirming the glass thickness of the glass measured in the state of the whole vehicle.
Further, step D, the thickness of the glass 6 includes 3.2mm, 3.5mm, 3.85mm, 4mm, 4.36mm, 4.76mm, 4.85mm and 5 mm.
Further, in the step E, the frequency spectrum is 400 Hz-1600 Hz.
Compared with the prior art, the invention has the beneficial effects that:
the test system and the test method for distinguishing the type and the thickness of the automobile glass adopt the acoustic method principle, can distinguish the type and the thickness of the glass under the condition that the glass is not disassembled in the whole automobile state, and have the advantages of simple method, small workload and no damage to a test object.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the excitation system;
FIG. 2 is a schematic view of the position of the sound intensity tester and the excitation system;
FIG. 3 is a schematic diagram of an application of the test system for discriminating the type and thickness of automotive glass according to the present invention;
fig. 4 is a schematic diagram of the anastomosis effect.
In the figure, 1, a loudspeaker 2, a sound insulation cover 3, a flanging 4, a double-sided adhesive tape 5, a sound intensity tester 6 and glass.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
First, the following terms are explained in order to better understand the technical aspects of the present invention.
1. The anastomosis effect is as follows: the phenomenon that the sound insulation quantity is reduced because the sound wave action caused by the incident angle of the sound wave is matched with the propagation speed of bending waves in the sound insulation piece is shown. As shown in FIG. 4, where a represents stiffness control, b represents resonance, c represents mass law, d represents critical frequency, e represents damped, and f represents undamped. The rightmost side is an anastomosis effect frequency band which corresponds to the 1600 Hz-4000 Hz frequency band of the automobile glass. Different glass has large damping difference and curve shape difference.
2. Mass law: the mass law refers to the basic law for determining the sound insulation quantity of sound insulation pieces or other building boards. Can be expressed as follows: the sound insulation of the sound insulation piece or other building boards is proportional to the logarithm of the surface density (or mass per unit area) of the sound insulation piece or other building boards, and can be expressed as R0-20 log (fps) -43 formula: r0 is the normal incidence sound insulation; ps is the areal density; f is the acoustic frequency. The mass law shows that when the material of the sound insulation piece is determined, in order to increase the sound insulation quantity, the only method is to increase the thickness of the sound insulation piece by one time, so that the mass per unit area is doubled, and the sound insulation quantity is increased by 6 dB. As shown in FIG. 4, the middle is a coincidence frequency band corresponding to the 400 Hz-1600 Hz frequency band of the automobile glass. Under the same material, the surface densities of different thicknesses are different, and the curve size difference is large.
As shown in FIGS. 1-3, the present invention relates to a test system for identifying the type and thickness of automotive glass, comprising an excitation system;
the excitation system consists of a loudspeaker 1 and a sound insulation cover 2;
the loudspeaker 1 is arranged at the front end of the sound insulation cover 2, the sound insulation cover 2 comprises a right-angle flange 3, and a layer of double faced adhesive tape 4 is adhered to the surface of the flange 3;
the excitation system is fixed on one side of toughened glass 6 with the thickness of 3.2mm, and the sound intensity tester 5 is arranged on the other side of the glass 6 and is coaxial with the sound insulation cover 2.
The sound insulation cover 2 is cylindrical and made of steel.
The sound insulation cover 2 is 2mm in thickness, 200mm in height and 50mm in bottom surface diameter.
The width of the flanging is 30 mm.
The probe of the sound intensity tester 6 is 150mm away from the glass.
The frequency resolution of the sound intensity tester 5 is set to 1 Hz.
The invention discloses a test method for distinguishing the type and thickness of automobile glass, which comprises the following steps:
A. manufacturing an excitation system: the excitation system mainly comprises a loudspeaker 1 and a sound insulation cover 2, as shown in figure 1, the sound insulation cover 2 is cylindrical, made of steel, 2mm in thickness, 200mm in height and 50mm in bottom surface diameter, the sound insulation cover comprises a right-angle flange 3, the width of the flange is 30mm, and a layer of double faced adhesive tape 4 is bonded on the surface of the sound insulation cover.
B. Bench test arrangement: in the anechoic chamber, an excitation system is fixed on one side of toughened glass 6 with the thickness of 3.2mm, a sound intensity tester 5 is arranged on the other side of the glass 6, and a probe of the sound intensity tester 5 is 150mm away from the glass and is coaxial with the sound insulation cover 2, as shown in figure 2.
C. Bench test: the loudspeaker 1 continuously emits narrow-band white noise of 400Hz to 4000Hz, the frequency resolution of the sound intensity tester 5 is set to be 1Hz, the sound intensity level can be considered to reach a stable state after 3 seconds, and the sound intensity test is carried out at the moment to obtain a sound intensity level frequency spectrum of 400Hz to 4000 Hz.
D. Establishing a database: by the same method, the sound intensity levels of different types of glass 6 with different thickness specifications are tested on a bench, and the types of the glass 6 comprise 4 types including tempered glass, acoustic laminated glass, common laminated glass and resin glass, and can cover all types of glass sold in the market. The thickness of the glass 6 comprises 3.2mm, 3.5mm, 3.85mm, 4mm, 4.36mm, 4.76mm, 4.85mm and 5mm, and can cover the thickness specification of most glasses of the vehicle types sold in the market. In each test, the sound of the loudspeaker 1 is consistent, the size of the sound insulation cover 2 is consistent, the distance between the probe of the sound intensity tester 5 and the surface of the glass 6 is consistent, and a database is accumulated.
E. And (3) testing the whole vehicle state: in the anechoic chamber, an excitation system is fixed on the inner side of glass 6, a sound intensity tester 5 is arranged on the outer side, and as shown in figure 3, the sound intensity level frequency spectrum of the glass to be tested at 400 Hz-4000 Hz is measured by the same method.
F. Judging the type of the glass: analyzing the sound intensity level frequency spectrum of 1600 Hz-4000 Hz, calculating the difference with the sound intensity level frequency spectrum of all different types of glass with different thickness specifications in the database, then calculating the standard deviation of the frequency spectrum difference, finding out the minimum value of the standard deviation, checking the corresponding glass type and thickness, and determining the glass type of the glass measured in the state of the whole vehicle.
Note 1: due to the influence of the coincidence effect, the frequency spectrum curves of the 4 kinds of glass in the frequency band have large difference, and the type of the glass is easy to judge.
Note 2: the influence of the glass thickness on the frequency spectrum curve of the frequency band is small, and the glass thickness is not easy to confirm.
Note 3: the influence of the mass law is large, the influence of the glass thickness on the spectrum curve of 400 Hz-1600 Hz is large, and the glass thickness is easy to judge.
G. Judging the thickness of the glass: after the type of the glass is confirmed, analyzing the sound level frequency spectrum of 400 Hz-1600 Hz, calculating the difference with the sound level frequency spectrum of the glass with different thicknesses of the type of the database, then calculating the standard deviation of the frequency spectrum difference, finding out the minimum value of the standard deviation, checking the corresponding glass thickness, and confirming the glass thickness of the glass measured in the state of the whole vehicle.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A test system for discriminating between type and thickness of automotive glass, comprising: comprises an excitation system;
the excitation system consists of a loudspeaker (1) and a sound insulation cover (2);
the loudspeaker (1) is arranged at the front end of the sound insulation cover (2), the sound insulation cover (2) comprises a right-angle-shaped flanging (3), and a layer of double-faced adhesive tape (4) is bonded on the surface of the flanging (3);
the excitation system is fixed on one side of toughened glass (6) with the thickness of 3.2mm, and the sound intensity tester (5) is arranged on the other side of the glass (6) and has the same axis with the sound insulation cover (2).
2. The test system for distinguishing between the type and thickness of automotive glass as claimed in claim 1, wherein: the sound insulation cover (2) is cylindrical and is made of steel.
3. The test system for distinguishing between the type and thickness of automotive glass as claimed in claim 1, wherein: the sound insulation cover (2) is 2mm in thickness, 200mm in height and 50mm in bottom surface diameter.
4. The test system for distinguishing between the type and thickness of automotive glass as claimed in claim 1, wherein: the width of the flanging (3) is 30 mm.
5. The test system for distinguishing between the type and thickness of automotive glass as claimed in claim 1, wherein: the distance between the probe of the sound intensity tester (5) and the glass (6) is 150 mm.
6. The test system for distinguishing between the type and thickness of automotive glass as claimed in claim 1, wherein: the frequency resolution of the sound intensity tester (5) is set to be 1 Hz.
7. A test method for distinguishing the type and thickness of automotive glass comprises the following steps:
A. manufacturing an excitation system: the excitation system mainly comprises a loudspeaker (1) and a sound insulation cover (2), wherein the sound insulation cover (2) is cylindrical and made of steel, the thickness of the sound insulation cover is 2mm, the height of the sound insulation cover is 200mm, the diameter of the bottom surface of the sound insulation cover is 50mm, the sound insulation cover (2) comprises a right-angle flanging (3), the width of the flanging (3) is 30mm, and the surface of the sound insulation cover is bonded with a layer of double-sided adhesive tape (4);
B. bench test arrangement: in the anechoic chamber, the excitation system is fixed on one side of toughened glass with the thickness of 3.2mm, the sound intensity tester is arranged on the other side of the glass (6), and the probe of the sound intensity tester (5) is 150mm away from the glass and has the same axis with the sound insulation cover (2);
C. bench test: the loudspeaker (1) continuously emits narrow-band white noise of 400Hz to 4000Hz, the frequency resolution of the sound intensity tester is set to be 1Hz, the sound intensity level can be considered to reach a stable state after 3 seconds, and the sound intensity test is carried out at the moment to obtain a sound intensity level frequency spectrum of 400Hz to 4000 Hz;
D. establishing a database: testing the sound intensity levels of different types of glass (6) with different thickness specifications on a rack by the same method, wherein the types of the glass (6) comprise 4 types of toughened glass, acoustic laminated glass, common laminated glass and resin glass; in each test, the consistent sound production of the loudspeaker (1) and the consistent size of the sound insulation cover (2) are required to be kept, the distance between a probe of the sound intensity tester (5) and the surface of the glass (6) is consistent, and a database is accumulated;
E. and (3) testing the whole vehicle state: in the anechoic chamber, an excitation system is fixed on the inner side of glass (6), a sound intensity tester (5) is arranged on the outer side, and the sound intensity level frequency spectrum of the glass (6) to be tested at 400 Hz-4000 Hz is measured by the same method;
F. judging the type of the glass: and analyzing the sound intensity level frequency spectrum of 1600Hz to 4000Hz, calculating the difference between the sound intensity level frequency spectrum of all different types of glass (6) with different thickness specifications in the database, then calculating the standard deviation of the frequency spectrum difference, finding out the minimum value of the standard deviation, checking the corresponding glass type and thickness, and determining the glass type of the glass 6 measured under the state of the whole vehicle.
G. Judging the thickness of the glass: after the type of the glass is confirmed, analyzing the sound level frequency spectrum of 400 Hz-1600 Hz, calculating the difference with the sound level frequency spectrum of the glass with different thicknesses of the type of the database, then calculating the standard deviation of the frequency spectrum difference, finding out the minimum value of the standard deviation, checking the corresponding glass thickness, and confirming the glass thickness of the glass measured in the state of the whole vehicle.
8. The test method for distinguishing between the type and thickness of automotive glass as claimed in claim 7, wherein: and D, the thickness of the glass (6) comprises 3.2mm, 3.5mm, 3.85mm, 4mm, 4.36mm, 4.76mm, 4.85mm and 5 mm.
9. The test method for distinguishing between the type and thickness of automotive glass as claimed in claim 7, wherein: and E, the frequency spectrum is 400 Hz-1600 Hz.
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| CN202010823042.0A CN112051336A (en) | 2020-08-17 | 2020-08-17 | Test system and test method for distinguishing type and thickness of automobile glass |
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| CN202010823042.0A CN112051336A (en) | 2020-08-17 | 2020-08-17 | Test system and test method for distinguishing type and thickness of automobile glass |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022222650A1 (en) * | 2021-04-21 | 2022-10-27 | Hong Kong Applied Science and Technology Research Institute Company Limited | Apparatus and method for classifying glass object using acoustic analysis |
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