CN111444589A - Fitting method and device for sound absorption coefficient of interior material - Google Patents
Fitting method and device for sound absorption coefficient of interior material Download PDFInfo
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- CN111444589A CN111444589A CN201910034196.9A CN201910034196A CN111444589A CN 111444589 A CN111444589 A CN 111444589A CN 201910034196 A CN201910034196 A CN 201910034196A CN 111444589 A CN111444589 A CN 111444589A
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Abstract
The invention discloses a fitting method and a fitting device for sound absorption coefficients of interior materials, wherein the fitting method for the sound absorption coefficients of the interior materials comprises the following steps: obtaining the flow resistance, porosity and standing wave tube sound absorption coefficient of the interior original material; inputting the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube into first software, and calculating by using the first software to obtain a bending factor, a thermal characteristic length and a viscous characteristic length of the interior original material; inputting the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and preset parameters into second software to establish an attribute card of the interior original material; and simulating a sound absorption coefficient curve of a certain part in the interior trim of the vehicle by utilizing second software according to the attribute card of the original material of the interior trim. The fitting method and the fitting device for the sound absorption coefficient of the interior material, provided by the embodiment of the invention, can flexibly realize the material proportion of different combinations and sequences at the same part, have real and reliable data, effectively shorten the experimental period and save the cost.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a fitting method and device for sound absorption coefficients of interior materials.
Background
The automobile acoustic package refers to a generic name of various sound-absorbing, sound-insulating, shock-absorbing, and sealing components related to NVH (Noise, Vibration, Harshness) performance of an automobile, such as a dash heat insulating pad, a carpet, a ceiling, a hole plug, a cavity partition, and the like. When the automobile acoustic bag is simulated, the sound absorption coefficient of the interior material is needed. Generally, the sound absorption coefficient of the interior material is measured mainly by an alpha cabin test. However, the method needs a long experimental period, and the data obtained by the test is single and high in cost.
Disclosure of Invention
The object of the present invention is to solve at least to some extent one of the above mentioned technical problems.
Therefore, the first purpose of the invention is to provide a fitting method of the sound absorption coefficient of the interior material, which can flexibly realize the material proportion of different combinations and sequences at the same part, has real and reliable data, effectively shortens the experimental period and saves the cost.
The second purpose of the invention is to provide a fitting device for the sound absorption coefficient of the interior decoration material.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a method for fitting sound absorption coefficients of interior materials, the method including:
obtaining the flow resistance, porosity and standing wave tube sound absorption coefficient of the interior original material;
inputting the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube into first software, and calculating by using the first software to obtain a bending factor, a thermal characteristic length and a viscous characteristic length of the interior original material;
inputting the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and preset parameters into second software to establish an attribute card of the interior original material;
and simulating a sound absorption coefficient curve of a certain part in the interior trim of the vehicle by utilizing the second software according to the attribute card of the original material of the interior trim.
Optionally, obtaining the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube of the interior original material includes:
detecting the flow resistance of the interior original material by using a flow resistance instrument;
detecting the porosity of the interior original material by using a porosity instrument;
and detecting the sound absorption coefficient of the standing wave tube of the interior original material by using the standing wave tube.
Optionally, the flow resistance, the porosity, and the sound absorption coefficient of the standing wave tube are input to a first software, and the first software is used to calculate and obtain the tortuosity factor, the thermal characteristic length, and the viscous characteristic length of the interior original material, including:
setting experiment conditions by using the first software, wherein the experiment conditions comprise environmental conditions, simulation types, density and frequency, and the environmental conditions comprise temperature, air pressure and humidity;
and inputting the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube into the first software to obtain the tortuosity factor, the thermal characteristic length and the viscous characteristic length of the interior original material.
Optionally, inputting the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and preset parameters into a second software to establish an attribute card of the interior original material, including:
generating a blank attribute card of the interior original material;
filling the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and preset parameters into the blank attribute card;
and setting the material simulation type and the material thickness of the interior original material.
Optionally, simulating a sound absorption coefficient curve of a certain part in the interior trim of the vehicle according to the attribute card of the original material of the interior trim by using the second software, including:
determining the composition and the layering sequence of a certain part in the vehicle interior;
selecting an attribute card of a required interior original material according to the composition and the layering sequence to simulate a certain part in the vehicle interior;
setting an experiment boundary condition and an experiment method to fit the sound absorption coefficient of a certain part in the vehicle interior.
Optionally, the first software is FOAM-X software, and the second software is NOVA software.
According to the fitting method of the sound absorption coefficient of the interior material, disclosed by the embodiment of the invention, the flow resistance, the porosity and the sound absorption coefficient of the interior original material are obtained, then the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube are input into first software, the bending factor, the thermal characteristic length and the viscous characteristic length of the interior original material are obtained by utilizing the first software to calculate, the flow resistance, the porosity, the bending factor, the thermal characteristic length, the viscous characteristic length and preset parameters are input into second software to establish an attribute card of the interior original material, finally, the second software is utilized, a sound absorption coefficient curve of a certain part in a vehicle interior is simulated according to the attribute card of the interior original material, the material matching and sequencing of different combinations of the same part can be flexibly realized, the data is real and reliable, the experimental period is effectively shortened, and the cost is saved.
In order to achieve the above object, a second aspect of the present invention provides a fitting device for sound absorption coefficient of interior material, including:
the acquisition module is used for acquiring the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube of the interior original material;
the calculation module is used for inputting the flow resistance, the porosity and the standing wave tube sound absorption coefficient into first software, and calculating and obtaining a tortuosity factor, a thermal characteristic length and a viscous characteristic length of the interior original material by utilizing the first software;
the establishing module is used for inputting the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and preset parameters into second software so as to establish an attribute card of the interior original material;
and the simulation module is used for simulating a sound absorption coefficient curve of a certain part in the interior trim of the vehicle according to the attribute card of the original material of the interior trim by using the second software.
Optionally, the obtaining module is configured to:
detecting the flow resistance of the interior original material by using a flow resistance instrument;
detecting the porosity of the interior original material by using a porosity instrument;
and detecting the sound absorption coefficient of the standing wave tube of the interior original material by using the standing wave tube.
Optionally, the calculating module is configured to:
setting experiment conditions by using the first software, wherein the experiment conditions comprise environmental conditions, simulation types, density and frequency, and the environmental conditions comprise temperature, air pressure and humidity;
and inputting the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube into the first software to obtain the tortuosity factor, the thermal characteristic length and the viscous characteristic length of the interior original material.
Optionally, the establishing module is configured to:
generating a blank attribute card of the interior original material;
filling the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and preset parameters into the blank attribute card;
and setting the material simulation type and the material thickness of the interior original material.
Optionally, the simulation module is configured to:
determining the composition and the layering sequence of a certain part in the vehicle interior;
selecting an attribute card of a required interior original material according to the composition and the layering sequence to simulate a certain part in the vehicle interior;
setting an experiment boundary condition and an experiment method to fit the sound absorption coefficient of a certain part in the vehicle interior.
Optionally, the first software is FOAM-X software, and the second software is NOVA software.
According to the fitting device for the sound absorption coefficient of the interior material, disclosed by the embodiment of the invention, the flow resistance, the porosity and the sound absorption coefficient of the interior original material are obtained, then the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube are input into the first software, the bending factor, the thermal characteristic length and the viscous characteristic length of the interior original material are obtained by utilizing the first software to calculate, the flow resistance, the porosity, the bending factor, the thermal characteristic length, the viscous characteristic length and preset parameters are input into the second software to establish the attribute card of the interior original material, and finally, the sound absorption coefficient curve of a certain part in the interior of a vehicle is simulated by utilizing the second software according to the attribute card of the interior original material, so that the material in different combination and sequencing at the same part can be flexibly realized, the data is real and reliable, the experiment period is effectively shortened, and the cost is saved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a fitting method of sound absorption coefficients of an interior material according to an embodiment of the present invention;
FIG. 2 is a graph showing the effect of setting experimental conditions using the first software;
FIG. 3 is a graph showing the effect of obtaining the tortuosity factor, thermal property length and adhesive property length of an interior trim raw material;
FIG. 4 is a first diagram of the effect of creating a property card of an interior original material;
FIG. 5 is a second diagram of the effect of creating an attribute card of the interior original material;
FIG. 6 is an effect view of a passenger compartment carpet assembly layering sequence;
FIG. 7 is a graph showing the effect of setting experimental boundary conditions and experimental methods;
FIG. 8 is a graph of the effect of sound absorption coefficient curves for a simulated passenger compartment carpet assembly;
FIG. 9 is an effect diagram for verifying the reliability of the sound absorption coefficient curve;
fig. 10 is a schematic structural diagram of a fitting device for sound absorption coefficient of an interior material according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The fitting method and apparatus of sound absorption coefficient of interior material of the embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a fitting method of sound absorption coefficients of an interior material according to an embodiment of the present invention.
As shown in fig. 1, the fitting method of the sound absorption coefficient of the interior material comprises the following steps:
s101, obtaining the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube of the interior original material.
With the increasingly intense competition of the automobile market and the increasing requirements of consumers on automobile products, the automobiles will continuously move towards the directions of safety, environmental protection, low cost, informatization and comfort in the future. The satisfaction degree of the consumer to the comfort of the automobile is mainly reflected in the satisfaction degree of the overall NVH performance of the automobile, namely the consumer needs the experience of low noise, low vibration and smooth driving. In order to improve the performance, the test is usually performed by means of simulation of an automobile acoustic package. Most of interior materials selected for the acoustic bag have the performances of sound absorption, sound insulation and shock absorption, and the proportion of the original materials adopted by the interior materials is different according to different specific installation positions. When the sound absorption coefficient of the interior material is tested by adopting an alpha cabin experiment, the required experiment period is long, the cost is high, and the material proportion of different combination sequencing at the same part cannot be flexibly realized. Therefore, the application provides a fitting method of the sound absorption coefficient of the interior material to solve the problems.
The interior of the automobile is formed by combining a plurality of different interior raw materials, wherein parameters such as flow resistance, porosity, standing wave tube sound absorption coefficient and the like of each interior raw material are different from those of other interior raw materials. Therefore, in the first step, the flow resistance, the porosity and the standing wave tube sound absorption coefficient of the interior original material need to be tested.
In one embodiment of the invention, the flow resistance of the interior original material can be detected by using a flow resistance instrument, the porosity of the interior original material can be detected by using a porosity instrument, and the sound absorption coefficient of the interior original material can be detected by using a standing wave tube.
S102, inputting the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube into first software, and calculating by using the first software to obtain the tortuosity factor, the thermal characteristic length and the viscous characteristic length of the interior original material.
The first software can be used for setting experimental conditions, namely inputting some experimental information when the flow resistance instrument, the porosity instrument and the standing wave tube are used for detecting the interior original material. The experimental conditions may include environmental conditions, simulation type, density, and frequency. The environmental conditions further include temperature, air pressure and humidity. As shown in FIG. 2, the temperature was 22.2 degrees, the air pressure was 1016 mbar, the humidity was 59.8%, and the simulation type was selected to be rigid or flexible and the density was 15kg/m3The frequency was set to a starting frequency of 300 hz and an ending frequency of 6400 hz.
After that, the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube can be input into the first software to obtain the tortuosity factor, the thermal characteristic length and the viscous characteristic length of the interior original material. It should be understood that the detected flow resistance, porosity, and standing wave tube acoustic absorption may be an average of data obtained from multiple detections. As shown in fig. 3, 3 standing wave tube sound absorption coefficients of two-component cotton with different thicknesses are selected, the porosity is 0.991, the flow resistance is 10586, and a correlation threshold value automatically generated based on software is 0.94799, so that the bending factor, the thermal characteristic length and the adhesive characteristic length of the interior original material are calculated.
Wherein, the first software is FOAM-X software.
S103, inputting the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and the preset parameters into second software to establish an attribute card of the interior original material.
After the tortuosity factor, the thermal characteristic length and the adhesive characteristic length of the interior trim raw material are obtained through calculation, an attribute card corresponding to the interior trim raw material can be generated in the second software by combining other parameters of the interior trim raw material.
Specifically, a blank attribute card of the interior original material may be generated, and then the flow resistance, porosity, tortuosity factor, thermal characteristic length, adhesive characteristic length, preset parameters, and the like corresponding to the interior original material may be filled into the blank attribute card. Then, the material simulation type and the material thickness of the interior original material are set, so that an attribute card of the interior original material is generated. The preset parameters may include an elastic modulus, a poisson's ratio, a sound propagation speed, an attenuation rate, and the like.
As shown in FIG. 4, the name of a certain interior original material is primary foaming 15mm, and the fluid parameters thereof can include a density of 1.167kg/m3Sound propagation speed 346.4m/s, porosity 0.944, flow resistance 69061, tortuosity factor 4.617827, viscosity length 9.481735e-5, thermal length 0.0002099; the solids parameter may include a solids density of 71kg/m3The modulus of elasticity was 12750, the Poisson ratio was 0.422, and the damping was 0.256.
As shown in FIG. 5, the simulation type of the material with 15mm primary foaming is set to be elastic, and the thickness of the material is 0.015 m.
And S104, simulating a sound absorption coefficient curve of a certain part in the interior trim of the vehicle by utilizing second software according to the attribute card of the original material of the interior trim.
After the attribute card of the interior original material is established, the second software can select the appropriate attribute card of the interior original material to simulate the sound absorption coefficient curve of a certain part in the vehicle interior.
Specifically, the composition and the layering sequence of a certain part in the vehicle interior can be determined, and then the required attribute card of the interior original material is selected according to the composition and the layering sequence, so that the certain part in the vehicle interior can be simulated. Then, experimental boundary conditions and experimental methods are set so as to fit the sound absorption coefficient of a certain part in the vehicle interior. As shown in fig. 6, the passenger compartment carpet assembly is composed of three raw materials of tufted carpet, EPDM (Ethylene Propylene Diene Monomer), and virgin foam. Thus, tufted carpet (860g), EPDM-1.4mm, and virgin foamed 15mm may be selected for fitting and ordered in order from top to bottom. The first layer is a tufted carpet, located on the air side, i.e. the layer in contact with the air; the second layer is EPDM and is a middle layer; the third layer is a virgin foam, on the metal side, i.e., the layer in contact with the metal of the vehicle. After the layering sequence was determined, experimental boundary conditions and experimental methods were set, and as shown in fig. 7, TMM (Transfer Matrix Method) was selected, and 0-90 degree diffuse sound field was selected to fit the sound absorption coefficient of the passenger compartment carpet assembly as shown in fig. 8.
Wherein the second software is NOVA software.
In addition, after the sound absorption coefficient curve of a certain part in the vehicle interior is simulated, the sound absorption coefficient curve can be compared with data obtained by an alpha cabin experiment, so that the reliability of the sound absorption coefficient curve is verified.
The simulation is carried out by taking a ceiling of a certain type of vehicle as an example, and the ceiling material is as follows: the parameter list of the 15mm felt +3mm PU plate +3.2mm knitted fabric is shown in the table I:
The simulated sound absorption coefficient curve (dotted line part) is compared with the alpha cabin experimental data (solid line part), as shown in fig. 9, the two trends are consistent, the goodness of fit is high, and a certain error range requirement is met. Therefore, the method provided by the application can be determined, the obtained data is real and reliable, and the alpha cabin experiment can be replaced, so that the experiment cost is reduced, the experiment period is shortened, the cost is saved, and the data diversification of the combination ratio of each layer material of the interior material can be realized.
According to the fitting method of the sound absorption coefficient of the interior material, disclosed by the embodiment of the invention, the flow resistance, the porosity and the sound absorption coefficient of the interior original material are obtained, then the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube are input into first software, the bending factor, the thermal characteristic length and the viscous characteristic length of the interior original material are obtained by utilizing the first software to calculate, the flow resistance, the porosity, the bending factor, the thermal characteristic length, the viscous characteristic length and preset parameters are input into second software to establish an attribute card of the interior original material, finally, the second software is utilized, a sound absorption coefficient curve of a certain part in a vehicle interior is simulated according to the attribute card of the interior original material, the material matching and sequencing of different combinations of the same part can be flexibly realized, the data is real and reliable, the experimental period is effectively shortened, and the cost is saved.
In order to realize the embodiment, the invention further provides a fitting device for the sound absorption coefficient of the interior material.
As shown in fig. 10, the fitting device of sound absorption coefficient of interior material may include an obtaining module 1100, a calculating module 1200, a building module 1300, and a simulating module 1400.
The obtaining module 1100 is used for obtaining the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube of the interior original material.
The calculating module 1200 is configured to input the flow resistance, the porosity, and the sound absorption coefficient of the standing wave tube into the first software, and calculate and obtain the bending factor, the thermal characteristic length, and the adhesion characteristic length of the interior original material by using the first software.
The establishing module 1300 is used for inputting the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and the preset parameters into the second software so as to establish the attribute card of the interior original material.
And the simulation module 1400 is used for simulating a sound absorption coefficient curve of a certain part in the interior trim of the vehicle according to the attribute card of the original material of the interior trim by using the second software.
It should be noted that, the explanation of the fitting method for sound absorption coefficient of an interior material is also applicable to the fitting device for sound absorption coefficient of an interior material in the embodiment of the present invention, and details not disclosed in the embodiment of the present invention are not repeated herein.
According to the fitting device for the sound absorption coefficient of the interior material, disclosed by the embodiment of the invention, the flow resistance, the porosity and the sound absorption coefficient of the interior original material are obtained, then the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube are input into the first software, the bending factor, the thermal characteristic length and the viscous characteristic length of the interior original material are obtained by utilizing the first software to calculate, the flow resistance, the porosity, the bending factor, the thermal characteristic length, the viscous characteristic length and preset parameters are input into the second software to establish the attribute card of the interior original material, and finally, the sound absorption coefficient curve of a certain part in the interior of a vehicle is simulated by utilizing the second software according to the attribute card of the interior original material, so that the material in different combination and sequencing at the same part can be flexibly realized, the data is real and reliable, the experiment period is effectively shortened, and the cost is saved.
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.
Furthermore, the terms "first", "second" and "first" 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 description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. 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.
Claims (12)
1. A method of fitting acoustic absorption coefficients of interior materials, comprising:
obtaining the flow resistance, porosity and standing wave tube sound absorption coefficient of the interior original material;
inputting the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube into first software, and calculating by using the first software to obtain a bending factor, a thermal characteristic length and a viscous characteristic length of the interior original material;
inputting the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and preset parameters into second software to establish an attribute card of the interior original material;
and simulating a sound absorption coefficient curve of a certain part in the interior trim of the vehicle by utilizing the second software according to the attribute card of the original material of the interior trim.
2. The method of claim 1, wherein obtaining the flow resistance, porosity, and standing wave tube acoustic absorption coefficient of the interior trim precursor comprises:
detecting the flow resistance of the interior original material by using a flow resistance instrument;
detecting the porosity of the interior original material by using a porosity instrument;
and detecting the sound absorption coefficient of the standing wave tube of the interior original material by using the standing wave tube.
3. The method of claim 1, wherein inputting the flow resistance, the porosity, and the standing wave tube acoustic absorption coefficient to a first software, and using the first software to calculate a tortuosity factor, a thermal characteristic length, and a viscous characteristic length of the interior original material comprises:
setting experiment conditions by using the first software, wherein the experiment conditions comprise environmental conditions, simulation types, density and frequency, and the environmental conditions comprise temperature, air pressure and humidity;
and inputting the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube into the first software to obtain the tortuosity factor, the thermal characteristic length and the viscous characteristic length of the interior original material.
4. The method of claim 1, wherein inputting the flow resistance, the porosity, the tortuosity factor, the thermal property length, the viscous property length, and preset parameters to a second software to create a property card of the interior trim raw material comprises:
generating a blank attribute card of the interior original material;
filling the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and preset parameters into the blank attribute card;
and setting the material simulation type and the material thickness of the interior original material.
5. The method of claim 1, wherein simulating an acoustic absorption coefficient curve for a portion of an interior trim of a vehicle based on an attribute card of the trim starting material using the second software comprises:
determining the composition and the layering sequence of a certain part in the vehicle interior;
selecting an attribute card of a required interior original material according to the composition and the layering sequence to simulate a certain part in the vehicle interior;
setting an experiment boundary condition and an experiment method to fit the sound absorption coefficient of a certain part in the vehicle interior.
6. The method of claim 1, wherein the first software is FOAM-X software and the second software is NOVA software.
7. An apparatus for fitting acoustic absorption coefficients of interior materials, comprising:
the acquisition module is used for acquiring the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube of the interior original material;
the calculation module is used for inputting the flow resistance, the porosity and the standing wave tube sound absorption coefficient into first software, and calculating and obtaining a tortuosity factor, a thermal characteristic length and a viscous characteristic length of the interior original material by utilizing the first software;
the establishing module is used for inputting the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and preset parameters into second software so as to establish an attribute card of the interior original material;
and the simulation module is used for simulating a sound absorption coefficient curve of a certain part in the interior trim of the vehicle according to the attribute card of the original material of the interior trim by using the second software.
8. The apparatus of claim 7, wherein the acquisition module is to:
detecting the flow resistance of the interior original material by using a flow resistance instrument;
detecting the porosity of the interior original material by using a porosity instrument;
and detecting the sound absorption coefficient of the standing wave tube of the interior original material by using the standing wave tube.
9. The apparatus of claim 7, wherein the computing module is to:
setting experiment conditions by using the first software, wherein the experiment conditions comprise environmental conditions, simulation types, density and frequency, and the environmental conditions comprise temperature, air pressure and humidity;
and inputting the flow resistance, the porosity and the sound absorption coefficient of the standing wave tube into the first software to obtain the tortuosity factor, the thermal characteristic length and the viscous characteristic length of the interior original material.
10. The apparatus of claim 7, wherein the establishing module is to:
generating a blank attribute card of the interior original material;
filling the flow resistance, the porosity, the tortuosity factor, the thermal characteristic length, the viscous characteristic length and preset parameters into the blank attribute card;
and setting the material simulation type and the material thickness of the interior original material.
11. The apparatus of claim 7, wherein the simulation module is to:
determining the composition and the layering sequence of a certain part in the vehicle interior;
selecting an attribute card of a required interior original material according to the composition and the layering sequence to simulate a certain part in the vehicle interior;
setting an experiment boundary condition and an experiment method to fit the sound absorption coefficient of a certain part in the vehicle interior.
12. The apparatus of claim 7, wherein the first software is FOAM-X software and the second software is NOVA software.
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| CN201910034196.9A CN111444589B (en) | 2019-01-15 | 2019-01-15 | Fitting method and fitting device for sound absorption coefficient of interior material |
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| CN201910034196.9A CN111444589B (en) | 2019-01-15 | 2019-01-15 | Fitting method and fitting device for sound absorption coefficient of interior material |
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| CN111444589A true CN111444589A (en) | 2020-07-24 |
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Citations (3)
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|---|---|---|---|---|
| EP1742048A1 (en) * | 2005-06-08 | 2007-01-10 | Rieter Technologies AG | Acoustic device for determining parameters of a porous material |
| CN103031461A (en) * | 2012-12-24 | 2013-04-10 | 大连理工大学 | Design method for noise-absorption metal fibrous porous material, metal fibrous porous material and preparation method thereof |
| CN107563063A (en) * | 2017-09-05 | 2018-01-09 | 无锡吉兴汽车声学部件科技有限公司 | The method for building up of acoustical material CAE simulation parameter databases |
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Patent Citations (3)
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|---|---|---|---|---|
| EP1742048A1 (en) * | 2005-06-08 | 2007-01-10 | Rieter Technologies AG | Acoustic device for determining parameters of a porous material |
| CN103031461A (en) * | 2012-12-24 | 2013-04-10 | 大连理工大学 | Design method for noise-absorption metal fibrous porous material, metal fibrous porous material and preparation method thereof |
| CN107563063A (en) * | 2017-09-05 | 2018-01-09 | 无锡吉兴汽车声学部件科技有限公司 | The method for building up of acoustical material CAE simulation parameter databases |
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| Title |
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| 上官文斌 等: "车用多层平板材料吸隔声特性的测试与计算分析" * |
| 张锦岚;钱家昌;王文博;: "基于NOVA的多孔材料吸声性能分析及优化" * |
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