CN105138746A - Method for inversely deducing Young modulus of loudspeaker vibrating member by means of stiffness coefficient of loudspeaker vibrating member - Google Patents
Method for inversely deducing Young modulus of loudspeaker vibrating member by means of stiffness coefficient of loudspeaker vibrating member Download PDFInfo
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- CN105138746A CN105138746A CN201510480173.2A CN201510480173A CN105138746A CN 105138746 A CN105138746 A CN 105138746A CN 201510480173 A CN201510480173 A CN 201510480173A CN 105138746 A CN105138746 A CN 105138746A
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- vibrating mass
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- young modulus
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Abstract
The present invention discloses a method for inversely deducing Young modulus of a loudspeaker vibrating member by means of a stiffness coefficient of the loudspeaker vibrating member, and belongs to the field of loudspeaker design and fabrication and material parameter measurement. The method comprises: firstly, obtaining a stiffness coefficient K1 of the loudspeaker vibrating member by using a measurement method; secondly, obtaining a stiffness coefficient K2 of the vibrating member by using an emulation analysis method, which comprises the steps of establishing a geometric model, establishing an emulation analysis model, carrying out static analysis solution and the like; and finally, by means of the stiffness coefficients K1 and K2, inversely deducing and calculating the Young modulus of the vibrating member material. According to the method, a material characteristic of the loudspeaker vibrating member can be relatively accurately obtained, so that a loudspeaker can be better designed and manufactured.
Description
Technical field
The invention belongs to loudspeaker design and manufacture and material property extracting field, what relate to is a kind of anti-method pushing away its Young modulus of stiffness factor by loudspeaker vibration parts.
Background technology
The vibrating mass of loudspeaker comprises centring disk, cone, dust cap, skeleton and voice coil loudspeaker voice coil etc., most of parts all belong to compound substance, such as centring disk, formed by hot-forming after fibrous braid is immersed in the glue matrixes such as phenolics, it is a kind of typical compound substance, its material behavior is comparatively complicated, is difficult to measure, and fabric dividing in process, joins the technique such as glue and hot pressing and all can produce material impact to the Young modulus of each parts finished product.But in the course of work of vibrating mass, show are mostly characteristics of linear elastic materials, vibrating mass is used as linear elastic materials process, greatly can simplifies the process of establishing of vibrating mass material model, be conducive to slip-stick artist and go more easily to understand and design vibrating mass.
The characteristic of linear elastic materials comprises Young modulus, Poisson ratio and density etc., wherein Young modulus is the main material parameter of linear elastic materials, be subject to the restriction of technological process and measuring method at present, cannot the Young modulus of Measurement accuracy vibrating mass material, can only use identical technological process as far as possible that the starting material of vibrating mass are pressed into smooth fabric, measure the Young modulus of fabric again, and the Young modulus be similar to as vibrating mass material, the fact shows, the error of this approximate generation is larger.Along with the continuous pursuit to loudspeaker quality, requirement can obtain a kind of method of Measurement accuracy vibrating mass young modulus of material.
Summary of the invention
The object of the invention is to obtain a kind of anti-method pushing away its Young modulus of stiffness factor by loudspeaker vibration parts;
The present invention is to solve cannot the problem of Measurement accuracy loudspeaker vibration component materials Young modulus.The present invention passes through measurement result and the simulation result of loudspeaker vibration parts stiffness factor, and Extrapolation goes out the Young modulus of vibrating mass material;
The anti-method pushing away its Young modulus of a kind of stiffness factor by loudspeaker vibration parts of the present invention, concrete steps are:
(1) stiffness factor obtaining vibrating mass is measured;
There are two kinds of mode measurements to obtain the stiffness factor of vibrating mass: the displacement amm/Mg 1) by vibrating mass design drawing indicates, calculate the stiffness factor of vibrating mass: K
1=M × 9.8 × 10
-3/ a(N/mm), M represents quality size, and a represents displacement size, and N represents unit of force; 2) use loudspeaker vibration parts compliance measuring instrument, measurement obtains certain some P on vibrating mass and is in different distortion displacement
x 1under stiffness factor
k 1 (
x 1);
Obtain higher measuring accuracy if wish, adopt mode 2) described in the stiffness factor of method measuring vibrations parts;
(2) simulation analysis obtains the stiffness factor of vibrating mass;
A. geometric model is set up;
Two kinds of modes are had to set up the geometric model of vibrating mass: 1) by the design drawing of vibrating mass, to obtain its geometric model; 2) 3D geometric profile scanner or coelosphere equipment is used, the geometric model of measuring vibrations parts, and the cad file being converted into STL form in Survey Software;
Obtain higher geometric accuracy if wish, suggestion employing mode 2) described in the geometric model of method measuring vibrations parts;
B. simulation analysis model is set up;
1) geometric model is imported: the geometric model importing vibrating mass in numerical evaluation software;
2) definition material parameter: define the Poisson ratio of vibrating mass material, density and Young modulus estimated value E
0;
3) physical field environment is set: select solid mechanics analytical model;
4) grid division: the geometric model of vibrating mass is divided into some grid cells, if 2D model, selects face unit, if 3D model, then and selective body unit;
5) boundary condition is defined: fixed boundary condition, the position of fixture when reference measure displacement or stiffness factor, at the corresponding site definition fixed boundary condition of vibrating mass geometric model; Load boundary condition, when adopt mode 1) measure obtain the stiffness factor of vibrating mass time, reference measure displacement time point of force application, vibrating mass corresponding site apply size be F=M × 9.8 × 10
-3n, direction is the load on vibrating mass operative orientation, when adopt mode 2) measure obtain the stiffness factor of vibrating mass time, point of force application during reference measure stiffness factor, applying size at the corresponding site of vibrating mass is 0.49N, and direction is the load on vibrating mass operative orientation;
C. static analysis solves;
1) in numerical evaluation software, select static analysis solver, solve the displacement obtaining corresponding P point place on vibrating mass
x 2;
2) the stiffness factor simulation result obtaining vibrating mass according to following formulae discovery is:
K
2=F/
x 2
(3) the anti-Young modulus pushing away vibrating mass material;
In the measurement result of vibrating mass stiffness factor
k 1 (
x 1) in, extract
x 1=
x 2the value K at place
1, the measurement result K of known vibrating mass stiffness factor
1, simulation result K
2with Young modulus estimated value E
0, according to the principle that Young modulus and the stiffness factor of linear elastic materials are directly proportional, the Young modulus E of Extrapolation vibrating mass material;
E=E
0×K
1/K
2
Numerical evaluation software comprises all business softwares based on finite element or boundary element theory, comprises COMSOL, ANSYS and ABAQUS.Loudspeaker vibration parts comprise dust cap, cone, centring disk, skeleton and voice coil loudspeaker voice coil.
Advantage of the present invention is: the inventive method passes through measurement result and the simulation result of loudspeaker vibration parts stiffness factor, the anti-Young modulus releasing vibrating mass material.The method can the Young modulus of Measurement accuracy vibrating mass material, helps electroacoustic engineering teacher to obtain the material behavior of loudspeaker vibration parts more exactly, thus designing and making loudspeaker better.
Accompanying drawing explanation
Fig. 1 is the invention process method flow diagram.
Fig. 2 is the 2D rotational symmetry geometric model of centring disk.
Fig. 3 is fixed boundary.
Fig. 4 is the stress and strain model result of this centring disk.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, the anti-method pushing away its Young modulus of a kind of stiffness factor by loudspeaker vibration parts of the present invention, concrete steps are:
(1) stiffness factor obtaining vibrating mass is measured;
There are two kinds of mode measurements to obtain the stiffness factor of vibrating mass: the displacement amm/Mg 1) by vibrating mass design drawing indicates, calculate the stiffness factor of vibrating mass: K
1=M × 9.8 × 10
-3/ a(N/mm), M represents quality size, and a represents displacement size, and N represents unit of force; 2) use loudspeaker vibration parts compliance measuring instrument, measurement obtains certain some P on vibrating mass and is in different distortion displacement
x 1under stiffness factor
k 1 (
x 1);
Obtain higher measuring accuracy if wish, adopt mode 2) described in the stiffness factor of method measuring vibrations parts;
(2) simulation analysis obtains the stiffness factor of vibrating mass;
A. geometric model is set up;
Two kinds of modes are had to set up the geometric model of vibrating mass: 1) by the design drawing of vibrating mass, to obtain its geometric model; 2) 3D geometric profile scanner or coelosphere equipment is used, the geometric model of measuring vibrations parts, and the cad file being converted into STL form in Survey Software;
Obtain higher geometric accuracy if wish, suggestion employing mode 2) described in the geometric model of method measuring vibrations parts;
B. simulation analysis model is set up;
1) geometric model is imported: the geometric model importing vibrating mass in numerical evaluation software;
2) definition material parameter: define the Poisson ratio of vibrating mass material, density and Young modulus estimated value E
0;
3) physical field environment is set: select solid mechanics analytical model;
4) grid division: the geometric model of vibrating mass is divided into some grid cells, if 2D model, selects face unit, if 3D model, then and selective body unit;
5) boundary condition is defined: fixed boundary condition, the position of fixture when reference measure displacement or stiffness factor, at the corresponding site definition fixed boundary condition of vibrating mass geometric model; Load boundary condition, when adopting the first measurement to obtain the stiffness factor mode of vibrating mass, point of force application during reference measure displacement, applying size at the corresponding site of vibrating mass is F=M × 9.8 × 10
-3n, direction is the load on vibrating mass operative orientation, when adopting the second measurement to obtain the stiffness factor mode of vibrating mass, and point of force application during reference measure stiffness factor, applying size at the corresponding site of vibrating mass is 0.49N, and direction is the load on vibrating mass operative orientation;
C. static analysis solves;
1) in numerical evaluation software, select static analysis solver, solve the displacement obtaining corresponding P point place on vibrating mass
x 2;
2) the stiffness factor simulation result obtaining vibrating mass according to following formulae discovery is:
K
2=F/
x 2
(3) the anti-Young modulus pushing away vibrating mass material;
In the measurement result of vibrating mass stiffness factor
k 1 (
x 1) in, extract
x 1=
x 2the value K at place
1, the measurement result K of known vibrating mass stiffness factor
1, simulation result K
2with Young modulus estimated value E
0, according to the principle that Young modulus and the stiffness factor of linear elastic materials are directly proportional, the Young modulus E of Extrapolation vibrating mass material;
E=E
0×K
1/K
2
Numerical evaluation software comprises all business softwares based on finite element or boundary element theory, comprises COMSOL, ANSYS and ABAQUS.Loudspeaker vibration parts comprise dust cap, cone, centring disk, skeleton and voice coil loudspeaker voice coil.
Now for the centring disk in a 6.5 inches of auto loud hailer vibrating mass, use its stiffness factor of COMSOL software emulation, and contrast with the stiffness factor by calculation of deflection method of the present invention is described.Described method mainly contain following steps;
Step 1: read displacement for 2.094mm/50g by the design drawing of centring disk, calculate its stiffness factor K
1=0.234N/mm;
Step 2: by the design drawing of centring disk, draws the 2D rotational symmetry geometric model of centring disk, sees Fig. 2;
Step 3: because centring disk is axially symmetric structure, therefore for the ease of calculating, first selects 2D rotational symmetry analysis environments in COMSOL software, then selects solid mechanics module, finally selects static analysis pattern;
Step 4: the 2D rotational symmetry geometric model importing centring disk in " geometry " of COMSOL software;
Step 5: use COMSOL to set up the finite element model of centring disk, concrete steps are as follows;
1) definition material characteristic.The density arranging centring disk is 450kg/m
3, Poisson ratio is 0.33, and Young modulus estimated value is 400MPa;
2) boundary condition is defined.Due to when measuring centring disk displacement, its outward flange is fixed by fixture, so define fixed boundary condition, as shown in thick lines in Fig. 3 at the geometric model outward flange of centring disk.Applying size at inward flange is-0.49N, and direction is the power of z;
3) stress and strain model.Arranging trellis-type is free triangular unit, and unit size is set to Extrafine, clicks Buildall, the results are shown in Figure 4;
Step 6: click Study starts to carry out static analysis and solves;
Step 7: after having solved, extracts the shift value of any point on centring disk inward flange
x 2=-1.4mm, then the simulation result of centring disk stiffness factor is;
K
2=
F/
x 2=-0.49N/(-1.4)mm=0.35N/mm
Step 8: instead push away Young modulus.Size and the Young modulus of centring disk stiffness factor are directly proportional, and by given data, can go out the Young modulus E=E of centring disk material by Extrapolation
0× K
1/ K
2=400MPa × 0.234/0.35=267.4MPa.
Last it is noted that above case study on implementation is only in order to illustrate implementation procedure of the present invention, and and unrestricted technical scheme described in the invention.Therefore, although this instructions with reference to above-mentioned each step to invention has been detailed description, but, those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, and all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, all should be encompassed in right of the present invention.
Claims (3)
1., by the anti-method pushing away its Young modulus of the stiffness factor of loudspeaker vibration parts, it is characterized in that this technology at least comprises the following steps:
(1) stiffness factor obtaining vibrating mass is measured;
There are two kinds of mode measurements to obtain the stiffness factor of vibrating mass: the displacement amm/Mg 1) by vibrating mass design drawing indicates, calculate the stiffness factor of vibrating mass: K
1=M × 9.8 × 10
-3/ a(N/mm), M represents quality size, and a represents displacement size, and N represents unit of force; 2) use loudspeaker vibration parts compliance measuring instrument, measurement obtains certain some P on vibrating mass and is in different distortion displacement x
1under stiffness factor K
1(x
1);
Obtain higher measuring accuracy if wish, adopt mode 2) described in the stiffness factor of method measuring vibrations parts;
(2) simulation analysis obtains the stiffness factor of vibrating mass;
A. geometric model is set up;
Two kinds of modes are had to set up the geometric model of vibrating mass: 1) by the design drawing of vibrating mass, to obtain its geometric model; 2) 3D geometric profile scanner or coelosphere equipment is used, the geometric model of measuring vibrations parts, and the cad file being converted into STL form in Survey Software;
Obtain higher geometric accuracy if wish, suggestion employing mode 2) described in the geometric model of method measuring vibrations parts;
B. simulation analysis model is set up;
1) geometric model is imported: the geometric model importing vibrating mass in numerical evaluation software;
2) definition material parameter: define the Poisson ratio of vibrating mass material, density and Young modulus estimated value E
0;
3) physical field environment is set: select solid mechanics analytical model;
4) grid division: the geometric model of vibrating mass is divided into some grid cells, if 2D model, selects face unit, if 3D model, then and selective body unit;
5) boundary condition is defined: fixed boundary condition, the position of fixture when reference measure displacement or stiffness factor, at the corresponding site definition fixed boundary condition of vibrating mass geometric model; Load boundary condition, when adopt mode 1) measure obtain the stiffness factor of vibrating mass time, reference measure displacement time point of force application, vibrating mass corresponding site apply size be F=M × 9.8 × 10
-3n, direction is the load on vibrating mass operative orientation, when adopt mode 2) measure obtain the stiffness factor of vibrating mass time, point of force application during reference measure stiffness factor, applying size at the corresponding site of vibrating mass is 0.49N, and direction is the load on vibrating mass operative orientation;
C. static analysis solves;
1) in numerical evaluation software, select static analysis solver, solve the displacement x obtaining corresponding P point place on vibrating mass
2;
2) the stiffness factor simulation result obtaining vibrating mass according to following formulae discovery is:
K
2=F/x
2
(3) the anti-Young modulus pushing away vibrating mass material;
At the measurement result K of vibrating mass stiffness factor
1(x
1) in, extract x
1=x
2the value K at place
1, the measurement result K of known vibrating mass stiffness factor
1, simulation result K
2with Young modulus estimated value E
0, according to the principle that Young modulus and the stiffness factor of linear elastic materials are directly proportional, the Young modulus E of Extrapolation vibrating mass material;
E=E
0×K
1/K
2。
2. as claimed in claim 1 by the anti-method pushing away its Young modulus of the stiffness factor of loudspeaker vibration parts, it is characterized in that numerical evaluation software comprises all business softwares based on finite element or boundary element theory, comprise COMSOL, ANSYS and ABAQUS.
3. as claimed in claim 1 by the anti-method pushing away its Young modulus of the stiffness factor of loudspeaker vibration parts, it is characterized in that loudspeaker vibration parts comprise dust cap, cone, centring disk, skeleton and voice coil loudspeaker voice coil.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108460204A (en) * | 2018-02-26 | 2018-08-28 | 浙江中科电声研发中心 | A method of pushing away its dynamic mechanics parameter of material by the way that the stress of loudspeaker vibration component and displacement are counter |
| WO2020063802A1 (en) * | 2018-09-28 | 2020-04-02 | 苏州上声电子股份有限公司 | Simulation and analysis method for speaker basket strength during screw mounting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108460204A (en) * | 2018-02-26 | 2018-08-28 | 浙江中科电声研发中心 | A method of pushing away its dynamic mechanics parameter of material by the way that the stress of loudspeaker vibration component and displacement are counter |
| CN108460204B (en) * | 2018-02-26 | 2022-02-18 | 浙江中科电声研发中心 | Method for reversely deducing dynamic mechanical parameters of material of loudspeaker through stress and displacement of vibrating part of loudspeaker |
| WO2020063802A1 (en) * | 2018-09-28 | 2020-04-02 | 苏州上声电子股份有限公司 | Simulation and analysis method for speaker basket strength during screw mounting |
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Address after: 314199 1 floor, 1 tower, science and technology center, 568 Jinyang East Road, Jiashan, Jiaxing, Zhejiang. Co-patentee after: Suzhou Sonavox electronic Limited by Share Ltd Patentee after: Zhejiang Electro-Acoustic R&D Center, CAS Address before: 314199 1 floor, 1 tower, science and technology center, 568 Jinyang East Road, Jiashan, Jiaxing, Zhejiang. Co-patentee before: Shangsheng Electronic Co., Ltd., Suzhou Patentee before: Zhejiang Electro-Acoustic R&D Center, CAS |
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