CN116132882B - Method for determining installation position of loudspeaker - Google Patents
Method for determining installation position of loudspeaker Download PDFInfo
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- CN116132882B CN116132882B CN202211655931.6A CN202211655931A CN116132882B CN 116132882 B CN116132882 B CN 116132882B CN 202211655931 A CN202211655931 A CN 202211655931A CN 116132882 B CN116132882 B CN 116132882B
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- 238000009434 installation Methods 0.000 title claims abstract description 40
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims abstract description 43
- 238000004088 simulation Methods 0.000 claims abstract description 38
- 230000001133 acceleration Effects 0.000 claims abstract description 16
- 238000013016 damping Methods 0.000 claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims description 57
- 239000007787 solid Substances 0.000 claims description 8
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- 239000000463 material Substances 0.000 description 14
- 238000004458 analytical method Methods 0.000 description 11
- 238000000418 atomic force spectrum Methods 0.000 description 4
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- 238000012805 post-processing Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/02—Spatial or constructional arrangements of loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
- H04R2205/024—Positioning of loudspeaker enclosures for spatial sound reproduction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
The invention discloses a method for determining the installation position of a loudspeaker. The installation position determining method comprises the following steps: calculating transmission force of a vibration system of the loudspeaker, presetting an installation position of the loudspeaker on a loudspeaker installation plate, establishing a finite element model for applying the transmission force to the installation position of the loudspeaker installation plate, and carrying out simulation calculation to obtain deformation condition of the loudspeaker installation plate, and judging whether the preset installation position of the loudspeaker on the loudspeaker installation plate is reasonable or not according to the deformation condition; wherein the transmission force is calculated from the vibration displacement, vibration velocity amplitude, vibration acceleration amplitude, damping, mass and stiffness coefficients of the vibration system of the loudspeaker. The method for determining the mounting position of the loudspeaker can determine the reasonable mounting position of the loudspeaker on the loudspeaker mounting plate, and avoid blindly enhancing the strength of the loudspeaker mounting plate.
Description
Technical Field
The invention relates to a method for determining the installation position of a loudspeaker, in particular to a method for determining the installation position of a loudspeaker of an automobile in the automobile.
Background
With the vigorous development of new energy automobiles, the vehicle-mounted entertainment system also has been developed in a rapid and rapid manner. With the increase of the power of the loudspeaker, the problem of door resonance and interior resonance has also plagued large host factories. Because of the particularity of the loudspeaker diaphragm, the force sensor cannot be directly used for accurately measuring the related force parameters, and because the weight of the loudspeaker diaphragm is usually within 10 g and is similar to that of the force sensor, the force sensor cannot be directly used for measuring the force parameters. In order to avoid resonance problems of the vibration system of the speaker, automobile manufacturers generally reinforce the strength of the door or interior trim to which the speaker is mounted, but this is blind and has problems of excessive reinforcement or insufficient reinforcement.
Disclosure of Invention
The invention aims to provide a method for determining the mounting position of a loudspeaker, which can determine the reasonable mounting position of the loudspeaker on a loudspeaker mounting plate and avoid blindly enhancing the strength of the loudspeaker mounting plate.
An aspect of the present invention provides a mounting position determining method of a speaker for determining a mounting position of the speaker on a speaker mounting board, the mounting position determining method including: calculating transmission force of a vibration system of the loudspeaker, presetting an installation position of the loudspeaker on a loudspeaker installation plate, establishing a finite element model for applying the transmission force to the installation position of the loudspeaker installation plate, and carrying out simulation calculation to obtain deformation condition of the loudspeaker installation plate, and judging whether the preset installation position of the loudspeaker on the loudspeaker installation plate is reasonable or not according to the deformation condition;
wherein the transmission force of the vibration system of the loudspeaker is calculated by:
(1) Measuring a vibration displacement of a vibration system of the speaker;
(2) Calculating the vibration speed amplitude of a vibration system of the loudspeaker according to the vibration displacement;
(3) Calculating the vibration acceleration amplitude of a vibration system of the loudspeaker according to the vibration speed;
(4) Measuring damping, mass and stiffness coefficients of a vibration system of the loudspeaker;
(5) Calculating the transmission force according to the results of steps (1) to (4).
Herein, the "vibration system of a speaker" specifically includes a diaphragm and a voice coil of the speaker, and for a speaker having a dust cover, the "vibration system" also includes a dust cover; for speakers having a locating tab, the "vibration system" also includes a locating tab. The diaphragm includes, but is not limited to, a cone.
Preferably, in step (5), the transmission force is calculated according to the following formula:
F＝ξ a ×K ms +a a ×M ms +v a ×R ms
wherein F represents transmission force, xi represents vibration displacement of a vibration system of the loudspeaker, and K ms Representing stiffness coefficient of vibration system of loudspeaker, a a Representing vibration acceleration amplitude, M, of a vibration system of a loudspeaker ms Representing the mass of the vibrating system of the loudspeaker, v a Representing the vibration velocity amplitude of the vibration system of the loudspeaker, R ms Representing the damping of the vibration system of the loudspeaker.
Preferably, in step (1), the vibration displacement ζ of the speaker is calculated by the following formula:
ξ＝ξ a cos(ωt-θ)
wherein, xi a The amplitude of the vibration system of the speaker is represented, ω represents the angular frequency of the vibration system of the speaker, t represents time, and θ represents the phase of the vibration system of the speaker.
Preferably, the step (2) specifically includes:
and (3) obtaining the vibration speed v of the vibration system of the loudspeaker by the first derivative of the vibration displacement xi with respect to time t, wherein the equation is as follows:
amplitude v of vibration velocity a The formula is as follows:
v a ＝ξ a ω；
wherein, xi a The amplitude of the vibration system of the speaker is represented, ω represents the angular frequency of the vibration system of the speaker, t represents time, and θ represents the phase of the vibration system of the speaker.
Preferably, the step (3) specifically includes:
and (3) obtaining the vibration acceleration a of the vibration system of the loudspeaker by the first derivative of the vibration speed v of the vibration system of the loudspeaker with respect to time t, wherein the equation is as follows:
a＝ξ a ω 2 cos(ωt-θ+π)
amplitude a of vibration acceleration a The formula is as follows:
a a ＝ξ a ω 2 ；
wherein, xi a The amplitude of the vibration system of the speaker is represented, ω represents the angular frequency of the vibration system of the speaker, t represents time, and θ represents the phase of the vibration system of the speaker.
Preferably, the speaker mounting plate is an irregularly-shaped sheet metal part in an automobile, the speaker is mounted in a speaker mounting hole formed in the sheet metal part, the sheet metal part and the speaker mounting hole formed in the sheet metal part are simulated, a finite element model for applying the transmission force to the speaker mounting hole is built, the deformation condition of the sheet metal part is obtained through simulation, and whether the position of the opening of the speaker mounting hole is reasonable is judged according to the deformation condition.
Preferably, the deformation condition includes one or more of stress distribution, strain distribution, and deformation displacement.
Preferably, if the stress is smaller than the set stress value, the strain is smaller than the set strain value, and the deformation displacement is smaller than the set deformation displacement value, the preset mounting position is determined to be reasonable.
Preferably, the finite element model is built from a geometric model of the speaker-mounting plate and the calculated transmission force.
Preferably, in the process of establishing the finite element model, the calculated transmission force is set as the loading force in a physical field of 'solid mechanics'.
More preferably, the establishing and calculating of the finite element model specifically includes: 1) Establishing a geometric model; 2) Setting a material model, constraint conditions and a load force (namely, a calculated transmission force F) in a physical field of 'solid mechanics'; 3) Setting material parameters; 4) Setting the type and the size of the grid, and dividing the grid to generate a finite element model. Then, solving the finite element model by adopting a frequency domain analysis method, and obtaining a displacement distribution diagram, a stress distribution diagram, a strain distribution diagram and a vibration displacement diagram of the metal plate through post-treatment.
In a specific embodiment, the specific steps of establishing a finite element model for applying the transmission force to the mounting position of the speaker-mounting board and simulating to obtain the deformation condition of the speaker-mounting board are as follows:
(1) Establishing a finite element model
1) And establishing a geometric model. The geometric model comprises a loudspeaker monomer and a loudspeaker mounting plate, and the specific modeling steps are as follows:
A. speaker-mounting plate geometry model importation: a simplified geometric model is given to a three-dimensional geometric model of only the loudspeaker mounting plate; because the strength problem of the loudspeaker mounting plate is researched, the loudspeaker is ignored in the simulation analysis, so that the purposes of reducing the calculated amount and improving the calculation efficiency are achieved;
B. geometric cleaning: in the finite element model construction process, redundant points, lines, planes and volumes in the geometric model can have great influence on the grid quality, so that after the geometric model is imported, the redundant points, lines, planes and volumes in the model are removed by adopting a geometric cleaning function, and the grid quality is improved;
2) The physical field and the material model are set, and the detailed steps are as follows:
A. setting a physical field: selecting a physical field of 'solid mechanics' to simulate and analyze the installation position of the loudspeaker for determination;
B. setting a material model: setting the loudspeaker mounting plate as a linear elastic model;
3) Boundary conditions and loads are defined, and the detailed steps are as follows:
A. constraint conditions: adding a fixed constraint to the edge of the speaker mounting plate;
B. defining a load: the loudspeaker mounting plate is loaded with the transmission force F of the loudspeaker,
4) Defining material properties: the material properties of the finite element simulation model are related to the physical field, the material model and the boundary conditions, and the material parameters required to be set comprise Young modulus, density and Poisson's ratio;
5) Dividing grids: specifying the type and the size of a grid cell to generate a finite element grid cell, and adopting a free tetrahedral grid type;
(2) Solving and post-processing
1) Solving: frequency domain analysis involving nonlinearities in speaker mounting position determination analysis
2) Post-treatment: the result obtained by solving the finite element model can be subjected to imaging processing or list display through post-processing, and the obtained result mainly comprises: a displacement profile of the speaker mounting plate; stress distribution diagram of speaker mounting board; a strain profile of the speaker mounting plate; vibration displacement profile of a speaker mounting plate.
Compared with the prior art, the invention has the following advantages:
according to the method, the loudspeaker mounting plate is simulated through the finite element model according to the transmission force of the vibration system of the loudspeaker to be mounted, the deformation condition of the loudspeaker mounting plate is obtained through simulation, the optimal mounting position of the loudspeaker on the loudspeaker mounting plate is further determined, adverse effects caused by resonance problems of the vibration system of the loudspeaker are reduced or eliminated, blind reinforcement of the loudspeaker mounting plate is avoided, redundancy is reduced, and cost is increased.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a graph showing the vibration displacement of the vibration system of the woofer employed in simulation examples 1 to 3.
Fig. 2 is a graph showing the vibration velocity of the vibration system of the woofer employed in simulation examples 1 to 3.
Fig. 3 is a vibration acceleration curve of the vibration system of the woofer employed in simulation examples 1 to 3.
Fig. 4 is a transmission force curve of the vibration system of the woofer employed in simulation examples 1 to 3.
Fig. 5 is a geometric model of the sheet metal member used in simulation example 1.
Fig. 6a, 6b, 6c and 6d are respectively a displacement profile, a stress profile, a strain profile and a vibration displacement profile of the sheet metal part of simulation example 1.
Fig. 7 is a geometric model of the sheet metal member used in simulation example 2.
Fig. 8a, 8b, 8c and 8d are respectively a displacement profile, a stress profile, a strain profile and a vibration displacement profile of the sheet metal part of simulation example 2.
Fig. 9 is a geometric model of the sheet metal member used in simulation example 3.
Fig. 10a, 10b, 10c and 10d are respectively a displacement profile, a stress profile, a strain profile and a vibration displacement profile of the sheet metal part of simulation example 3.
The reference numerals are as follows:
1. a sheet metal part; 11. and a speaker mounting hole.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Automobile speakers are typically mounted on sheet metal parts in automobiles, for example door panel speakers need to be mounted on sheet metal parts of the door panels. The sheet metal parts constituting the doors of automobiles, interior parts, and the like are often irregularly shaped, and the mounting position of the speaker on the sheet metal parts has an important influence on the strength of the sheet metal parts. The embodiment provides a method for determining the installation position of a loudspeaker in an automobile, which is used for determining the optimal installation position of the loudspeaker on a sheet metal part of an automobile door or an interior trim part, and in the position, the influence of transmission force applied to the sheet metal part when a vibration system of the loudspeaker produces sound on the sheet metal part is small, resonance is avoided, and the deformation degree of the sheet metal part is reduced or eliminated.
The installation position determining method comprises the following steps: calculating transmission force of a vibration system of the loudspeaker, presetting an installation position of the loudspeaker on a loudspeaker installation plate, establishing a finite element model for applying the transmission force to the installation position of the loudspeaker installation plate, and carrying out simulation calculation to obtain deformation conditions of the loudspeaker installation plate, and judging whether the preset installation position of the loudspeaker on the loudspeaker installation plate is reasonable or not according to the deformation conditions.
Wherein the transmission force of the vibration system of the loudspeaker is calculated by:
s1, measuring vibration displacement of a vibration system of a loudspeaker by using a TRF module of a KLI PPEL R & D system;
s2, calculating the vibration speed and the vibration speed amplitude of a vibration system of the loudspeaker according to the vibration displacement obtained in the step S1;
s3, calculating the vibration acceleration and the vibration acceleration amplitude of a vibration system of the loudspeaker according to the vibration speed obtained in the step S2;
s4, measuring damping, mass and stiffness coefficients of the loudspeaker vibration system by utilizing an LPM module of the KLI PPEL R & D system;
s5, calculating the transmission force of the vibration system of the loudspeaker according to the results obtained in the steps S1, S2, S3 and S4.
Specifically, step S1 includes:
and measuring vibration displacement xi of a vibration system of the loudspeaker by using a TRF module of the KLI PPEL R & D system, wherein an equation of the vibration displacement xi of the vibration system of the loudspeaker is as follows:
ξ＝ξ a cos(ωt-θ) (1)
wherein, xi a For amplitude, ω is angular frequency, t is time, and θ is phase.
The step S2 comprises the following steps:
calculating the vibration speed v of a vibration system of the loudspeaker, and obtaining the vibration speed v by the first derivative of the vibration displacement xi with respect to the time t, wherein the equation is as follows:
thus, the amplitude of the vibration system of the vibration speed is the amplitude of the vibration displacement multiplied by the angular frequency, that is:
v a ＝ξ a ω (3)。
the step S3 comprises the following steps:
and calculating the vibration acceleration a of a vibration system of the loudspeaker, and obtaining the vibration acceleration a by the first derivative of the vibration speed v with time t, wherein the equation is as follows:
a＝ξ a ω 2 cos(ωt-θ+π) (4)
therefore, the amplitude of the vibration acceleration is the amplitude of the vibration displacement multiplied by the square of the angular frequency, that is:
a a ＝ξ a ω 2 (5)。
the step S4 includes:
by KLI PPEL R&D system LPM module measures damping R of vibration system of loudspeaker ms Mass M ms Coefficient of stiffness K ms 。
In step S5, the transmission force F of the speaker vibration system is:
F＝ξ a ×K ms +a a ×M ms +v a ×R ms (6)。
the transmission force of the vibration system of the loudspeaker is calculated, so that the engineering calculation is facilitated, the practical engineering significance is realized, and the practical operation is facilitated. The transmission force F is applied to different metal plates, and the deformation conditions of the different metal plates, including stress, strain and deformation displacement conditions, can be calculated by establishing a finite element simulation analysis model, so that whether the position of the loudspeaker mounted on the metal plate is reasonable or not is judged.
The finite element simulation analysis is specifically as follows:
(1) Establishing a finite element model
1) And establishing a geometric model. The geometric model comprises a loudspeaker monomer and a sheet metal part, and the specific modeling steps are as follows:
A. the sheet metal part geometric model is imported into COMSOL Mu lt iphys ics software: simplifying a three-dimensional geometric model of a sheet metal part; because the strength problem of the sheet metal part is researched, the loudspeaker is ignored in the simulation analysis, so that the purposes of reducing the calculated amount and improving the calculation efficiency are achieved;
B. geometric cleaning: in the finite element model construction process, redundant points, lines, planes and volumes in the geometric model can have great influence on the grid quality, so that after the geometric model is imported, the redundant points, lines, planes and volumes in the model are removed by adopting a geometric cleaning function, and the grid quality is improved;
2) The physical field and the material model are set, and the detailed steps are as follows:
A. setting a physical field: selecting a physical field of 'solid mechanics' to simulate and analyze the installation position of the loudspeaker for determination;
B. setting a material model: setting the sheet metal part as a linear elastic model;
3) Boundary conditions and loads are defined, and the detailed steps are as follows:
A. constraint conditions: adding fixed constraint for the edge of the sheet metal part;
B. defining a load: the sheet metal part is loaded with the transmission force F of the loudspeaker,
4) Defining material properties: the material properties of the finite element simulation model are related to the physical field, the material model and the boundary conditions, and the material parameters required to be set comprise Young modulus, density and Poisson's ratio;
5) Dividing grids: specifying the type and the size of a grid cell to generate a finite element grid cell, and adopting a free tetrahedral grid type;
(2) Solving and post-processing
1) Solving: frequency domain analysis method including nonlinearity in speaker installation position determination analysis
2) Post-treatment: the result obtained by solving the finite element model can be subjected to imaging processing or list display through post-processing, and the obtained result mainly comprises: displacement distribution diagram of sheet metal parts; stress distribution diagram of sheet metal parts; strain distribution diagram of sheet metal parts; vibration displacement curve graph of sheet metal part.
Simulation example 1
Using woofer units, using KLI PPEL R&The D-system TRF module measures the vibration displacement curve of the loudspeaker vibration system, as shown in fig. 1. By KLI PPEL R&D system LPM module measures and obtains damping R of loudspeaker vibration system ms = 1.767Kg/s, mass M ms 11.956g, stiffness coefficient K ms =2.51n/mm. Using the above formulas (1) to (5), a vibration velocity curve of the speaker vibration system is calculated, as shown in fig. 2; calculating a vibration acceleration curve of the loudspeaker vibration system, as shown in fig. 3; a transmission force curve of the loudspeaker vibration system is calculated as shown in fig. 4.
The geometric model of the sheet metal part 1 adopted in the simulation example 1 is shown in fig. 5, wherein the middle part of the sheet metal part 1 is provided with a speaker mounting hole 11, and the hole is the mounting position of the woofer. The geometric model is imported into finite element analysis software COMSOL Mu lt iphys ics, the calculated transmission force is set as the load force in the physical field of 'solid mechanics', the finite element model is constructed and solved, and a displacement distribution diagram, a stress distribution diagram, a strain distribution diagram and a vibration displacement diagram of the sheet metal part 1 are obtained, which are sequentially shown in fig. 6a to 6 d.
Simulation example 2
Simulation example 2 used the same woofer as simulation example 1, which had the same transmission force profile, as shown in fig. 4.
The geometric model of the sheet metal part 1 used in simulation example 2 is shown in fig. 7, wherein a speaker mounting hole 11 is formed in the middle of the left edge of the sheet metal part 1, and the hole is the mounting position of the woofer. The geometric model is imported into finite element analysis software COMSOL Mu lt iphys ics, the calculated transmission force is set as the load force in the physical field of 'solid mechanics', the finite element model is constructed and solved, and a displacement distribution diagram, a stress distribution diagram, a strain distribution diagram and a vibration displacement diagram of the sheet metal part 1 are obtained, which are sequentially shown in fig. 8a to 8 d.
Simulation example 3
Simulation example 3 used the same woofer as simulation example 1, which had the same transmission force profile, as shown in fig. 4.
The geometric model of the sheet metal part 1 used in simulation example 3 is shown in fig. 9, wherein a speaker mounting hole 11 is formed at one vertex angle position of the sheet metal part 1, and the hole is the mounting position of the woofer. The geometric model is imported into finite element analysis software COMSOL Mu lt iphys ics, the calculated transmission force is set as the load force in the physical field of 'solid mechanics', the finite element model is constructed and solved, and a displacement distribution diagram, a stress distribution diagram, a strain distribution diagram and a vibration displacement diagram of the sheet metal part 1 are obtained, which are sequentially shown in fig. 10a to 10 d.
Comparing the results of the solutions of simulation examples 1 to 3, it is known that the sheet metal part 1 of simulation example 1 has small displacement, stress, strain and vibration displacement, and the position setting of the speaker mounting hole in simulation example 1 is most reasonable.
It should be noted that: for convenience of comparison and understanding, the sheet metal parts 1 adopted in simulation examples 1 to 3 are regular squares, and according to common sense or physical stress analysis, it is known that for square sheet metal parts with uniform thickness, transmission force is applied to the middle parts of the square sheet metal parts, and the deformation degree of the sheet metal parts is minimum, which is consistent with the result of finite element simulation. However, in practical application, most sheet metal parts adopted by automobile panels or interior trim parts and the like are irregular, and according to common knowledge or acceptance analysis, it is difficult to know which position to mount a loudspeaker and at which selected mounting position can bear the transmission force without deformation, and then the deformation conditions such as stress, strain and displacement of the sheet metal parts at different mounting positions can be accurately known by adopting the method, so that the optimal or reasonable mounting positions are screened, the mounting design of the automobile loudspeaker in an automobile is facilitated, and blind reinforcement of the automobile interior trim parts is not needed while the influence of resonance is reduced or eliminated.
As used in this specification and in the claims, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.
The above-described embodiments are provided for illustrating the technical concept and features of the present invention, and are intended to be preferred embodiments for those skilled in the art to understand the present invention and implement the same according to the present invention, not to limit the scope of the present invention.
Claims (10)
1. A mounting position determining method of a speaker for determining a mounting position of the speaker on a speaker mounting board, characterized by comprising: calculating transmission force of a vibration system of the loudspeaker, presetting an installation position of the loudspeaker on a loudspeaker installation plate, establishing a finite element model for applying the transmission force to the installation position of the loudspeaker installation plate, and carrying out simulation calculation to obtain deformation condition of the loudspeaker installation plate, and judging whether the preset installation position of the loudspeaker on the loudspeaker installation plate is reasonable or not according to the deformation condition;
wherein the transmission force of the vibration system of the loudspeaker is calculated by:
(1) Measuring an amplitude of a vibration system of the speaker;
(2) Calculating the vibration speed amplitude of a vibration system of the loudspeaker according to the vibration displacement;
(3) Calculating the vibration acceleration amplitude of a vibration system of the loudspeaker according to the vibration speed;
(4) Measuring damping, mass and stiffness coefficients of a vibration system of the loudspeaker;
(5) Calculating the transmission force according to the results of steps (1) to (4).
2. The mounting position determining method according to claim 1, wherein in step (5), the transmission force is calculated according to the following formula:
F＝ξ a ×K ms +a a ×M ms +v a ×R ms
wherein F represents transmission force, ζ a Representing the amplitude, K, of the vibration system of the loudspeaker ms Representing stiffness coefficient of vibration system of loudspeaker, a a Representing vibration acceleration amplitude, M, of a vibration system of a loudspeaker ms Representing the mass of the vibrating system of the loudspeaker, v a Representing the vibration velocity amplitude of the vibration system of the loudspeaker, R ms Representing the damping of the vibration system of the loudspeaker.
3. The mounting position determining method according to claim 1 or 2, wherein in step (1), the vibration displacement ζ of the speaker is calculated by:
ξ＝ξ a cos(ωt-θ)
wherein, xi a The amplitude of the vibration system of the speaker is represented, ω represents the angular frequency of the vibration system of the speaker, t represents time, and θ represents the phase of the vibration system of the speaker.
4. A mounting position determining method according to claim 3, wherein the step (2) specifically comprises:
and (3) obtaining the vibration speed v of the vibration system of the loudspeaker by the first derivative of the vibration displacement xi with respect to time t, wherein the equation is as follows:
amplitude v of vibration velocity a The formula is as follows:
v a ＝ξ a ω；
wherein, xi a The amplitude of the vibration system of the speaker is represented, ω represents the angular frequency of the vibration system of the speaker, t represents time, and θ represents the phase of the vibration system of the speaker.
5. The method of determining a mounting position according to claim 4, wherein the step (3) specifically includes:
and (3) obtaining the vibration acceleration a of the vibration system of the loudspeaker by the first derivative of the vibration speed v of the vibration system of the loudspeaker with respect to time t, wherein the equation is as follows:
a＝ξ a ω 2 cos(ωt-θ+π)
amplitude a of vibration acceleration a The formula is as follows:
a a ＝ξ a ω 2 ；
wherein, xi a The amplitude of the vibration system of the speaker is represented, ω represents the angular frequency of the vibration system of the speaker, t represents time, and θ represents the phase of the vibration system of the speaker.
6. The method for determining a mounting position according to claim 1, wherein the speaker mounting plate is an irregularly shaped sheet metal part in an automobile, the speaker is mounted in a speaker mounting hole formed in the sheet metal part, the sheet metal part and the speaker mounting hole formed in the sheet metal part are simulated, a finite element model for applying the transmission force to the speaker mounting hole is built, deformation conditions of the sheet metal part are obtained through simulation, and whether the opening position of the speaker mounting hole is reasonable is judged according to the deformation conditions.
7. The mounting position determining method according to claim 1 or 6, wherein the deformation condition includes one or more of stress distribution, strain distribution, and deformation displacement.
8. The mounting position determining method according to claim 7, wherein the preset mounting position is judged to be reasonable if the stress is smaller than a set stress value, the strain is smaller than a set strain value, and the deformation displacement is smaller than a set deformation displacement value.
9. The mounting position determining method of claim 1, wherein the finite element model is built from a geometric model of the speaker-mounting board and the calculated transmission force.
10. The mounting position determining method according to claim 9, wherein the calculated transmission force is set as the load force in the "solid mechanics" physical field in the process of establishing the finite element model.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211655931.6A CN116132882B (en) | 2022-12-22 | 2022-12-22 | Method for determining installation position of loudspeaker |
| PCT/CN2023/127702 WO2024131284A1 (en) | 2022-12-22 | 2023-10-30 | Method for determining mounting position of speaker |
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| WO2024131284A1 (en) | 2024-06-27 |
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