CN1910650A - Automotive dash insulators containing viscoelastic foams - Google Patents
Automotive dash insulators containing viscoelastic foams Download PDFInfo
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- CN1910650A CN1910650A CNA2005800022194A CN200580002219A CN1910650A CN 1910650 A CN1910650 A CN 1910650A CN A2005800022194 A CNA2005800022194 A CN A2005800022194A CN 200580002219 A CN200580002219 A CN 200580002219A CN 1910650 A CN1910650 A CN 1910650A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
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Abstract
Sound insulating systems including viscoelastic foams are described. The sound insulating system includes a sound-absorbing layer. The sound-absorbing layer can include viscoelastic foams. An optional barrier layer is adjacent to the sound-absorbing layer. Additionally, an optional substrate layer is adjacent to the sound-absorbing layer, and is spaced and opposed from the optional barrier layer. The sound insulating system is particularly well adapted to be employed as vehicle dashmats.
Description
The mutual reference of related application
The application requires the U.S. provisional application No.60/535 of submission on January 12nd, 2004,933 right of priority.The disclosure of application more than this introduces by reference.
Technical field
The present invention relates generally to sound insulation system.More particularly, the present invention relates to comprise the sound insulation system of viscoelastic foam (viscoelastic foams).
Background technology
The automaker makes great efforts to reduce global noise and the vibration in the vehicle.Limit noise, vibration and violence (that is, " NVH ") have become the important consideration of Automobile Design.Before, engine noise was typically occupied an leading position in overall vehicle noise.Other noise source as tire, wind and gas outlet, also becomes the same reduction that needs with engine noise.More recent, interior vehicle noise suppresses to have become the direct result that the consumer requires to reduce noise in the vehicle.
Therefore, people drop into the reduction of making great efforts to be devoted to interior vehicle noise significantly.One of these effort are to use barrier (barrier) notion, dividing plate pad (dashmat) or dash insulators (dash insulator) system before being also referred to as.These preceding dividing plate pads are used to reduce the noise from the engine to the vehicle interior.Typically, so preceding dividing plate pad is placed on base material (substrate) and goes up or adjacent base material, and this base material such as firewall (firewall) are to reduce the noisiness that passes to vehicle interior from engine by firewall.General description to preceding dividing plate pad technology can find in the open No.2003/0180500 A1 of U.S. patented claim, specially introduces the whole instructions of the document by reference at this.
Preceding dividing plate pad is formerly typically made by decoupler (decoupler), usually form by foam (dull and stereotyped (slab) or casting (cast) foam) and barrier, typically by TPO (thermoplastic polyolefin, TPO) or the ethylene vinyl acetate sheet (ethylene vinylacetate EVA) makes.These preceding dividing plate pads all are intended to reduce overall engine compartment noise.The dividing plate pad is typically heavier relatively before such barrier type, reduces the result to produce required noise.
The suitable major part of dividing plate pad performance depends on the performance of foam before believing.It has been generally acknowledged that foaming properties is the function of transmission loss, absorption, modulus and damping (damping) characteristic of foam.
More recent, use the preceding dividing plate pad of lightweight.Lightweight concept adopts absorbent material, as long bullet velvet apple (shoddy cotton).The target of dividing plate pad is to absorb and the dissipation engine noise when nacelle passes to vehicle interior when engine noise before this type, rather than the blocking-up engine noise.The dividing plate mattress system also reduces the overall weight of vehicle before these lightweights.Can be to the general description of dividing plate mattress system before these types of lightweight at U.S. patent Nos.6, find in 145,617 and 6,296,075, at this specially by with reference to the whole instructions of introducing described document.
The major function of dividing plate pad is to reduce the noise level of vehicle interior before arbitrary type.Traditionally, believe according to mass law and come block noise offer the best noise transfer loss and noise reduction.It is the typical measurement parameter that is used for the preceding dividing plate mattress system performance of quantification that transmission loss and noise reduce.
Although the dividing plate pad is successful reducing interior vehicle noise aspect horizontal to a certain extent before conventional, they are not entirely satisfactory.More specifically, insulation foam (that is, decoupler) is a relative nullity, because it does not have suitable absorptive acoustic properties.Therefore, when noise entered vehicle interior by preceding dividing plate pad, let it be, and what the source was, all sufficiently do not blocked, dissipates or reduce.In addition, insulation foam early since the vibration of base material or barrier layer and prevent aspect the noise not too effective.
Therefore, hope can provide the preceding dividing plate pad of the transmission loss Performance Characteristics with raising, so that can be used to reduce engine compartment noise of coming by firewall and the noise that enters passenger compartment from other source during vehicle operating.
Summary of the invention
According to first embodiment of the present invention, the sound insulation system that comprises sound absorbing layer is provided, the absorption coefficient of this sound absorbing layer is about 0.2 to about 1.0 scope, the damping loss factor about 0.3 to about 2.0 scope.
According to alternate embodiment of the present invention, the sound insulation system that comprises sound absorbing layer is provided, the absorption coefficient of this sound absorbing layer is about 0.2 to about 1.0 scope, the damping loss factor about 0.3 to about 2.0 scope.This system further comprises the barrier layer that is connected to this sound absorbing layer and impermeable basically fluid stream of flowing through.
According to alternate embodiment of the present invention, the sound insulation system that comprises sound absorbing layer is provided, this sound absorbing layer comprises viscoelastic foam.About 0.7 to about 1 scope, and the damping loss factor is in about scope of 0.4 to 1.6 at the absorption coefficient of about 1000Hz to the frequency of about 6000Hz for this viscoelastic foam.This system further comprises the barrier layer that is connected to this viscoelastic foam and impermeable basically fluid stream of flowing through.
Description of drawings
Can understand the present invention more fully from the detailed description and the accompanying drawings, in the accompanying drawings:
Fig. 1 is the cut-open view of the exemplary sound insulation system of general instruction according to the present invention;
Figure 1A is the cut-open view that is connected to the sound insulation system shown in Figure 1 of base material according to one embodiment of the invention;
Fig. 2 is illustrating according to the normal incident absorption coefficient characteristic of one embodiment of the invention comparative example expressivity sound absorbing layer;
Fig. 3 is the summary description of determining the illustrative test of the elastic modulus of exemplary sound absorbing layer and damping according to one embodiment of the invention;
Fig. 4 illustrating that be comparison according to the transmission loss characteristics of sound insulation system of the present invention and conventional sound insulation system;
Fig. 5 illustrating that be comparison according to the surface weight characteristic of sound insulation system of the present invention and conventional sound insulation system;
Fig. 6 is according to one embodiment of the invention, with intended target (profile) relevant and comparison illustrating according to the transmission loss characteristics of sound insulation system of the present invention and conventional sound insulation system that distribute;
Fig. 7 is according to one embodiment of the invention, and the average noise of sound insulation system more of the present invention and conventional sound insulation system reduces improved the illustrating of decibel of characteristic;
Fig. 8 is the figure that shows the damping test result;
Fig. 9 is the figure that shows the damping test result;
Figure 10 shows the figure that inserts the loss test result; And
Figure 11 is the figure that shows the damping test result.
Embodiment
Following description to preferred embodiment only is exemplary in essence, and never is intended to limit the present invention, its application or purposes.
Fig. 1 is the viewgraph of cross-section of one embodiment of the invention.As shown in Figure 1, existence is shown generically 10 sound insulation system.Sound insulation system 10 preferably includes multilayer system.Sound insulation system 10 preferably includes and refers generally to be shown 12 sound absorbing layer.Refer generally to be shown 14 the preferably contiguous sound absorbing layer 12 of optional barrier layer.Will be appreciated that system 10 preferably can be in order to movably or for good and all fastening or be connected to and refer generally to be shown 14 optional substrate, as firewall, shown in Figure 1A.Base material 16 preferred adjacent tones layers 12 and spaced apart and relative with barrier layer 14.
Sound absorbing layer 12 preferably includes foamed material 18.Foamed material 18 preferably includes viscoelastic foam, more preferably viscoelastic (flexible) foam, also more preferably viscoelastic polyurethane foam.Viscoelastic foam is also referred to as memory (memory) or is in harmonious proportion (temper) foam, is (open-celled) of perforate and the slow recovery that is characterized as after compression it usually substantially.
The use of viscoelastic foam according to the present invention in preceding dividing plate mattress system also may substituting as the shock material that is commonly referred to clay (mastic).
Although viscoelastic foam is preferred for enforcement of the present invention, can separately or be used in combination other foam with necessary performance described herein.Therefore, foamed material 18 can comprise any natural or synthetic foam, no matter be dull and stereotyped or (molded) of molding.Foamed material 18 can be perforate or closed pore or its combination.Foamed material 18 can comprise latex foam polyolefin, polyurethane, polystyrene, polyester and combination thereof.Foamed material 18 also can comprise and utilizes foam, lathery fiber mat or micro-pore elastomer foam again.In addition, foamed material 18 can comprise organic and/or inorganic filler.In addition, other adjuvant can be introduced in the foamed material 18, such as but not limited to fire retardant, antifoggant, ultraviolet light absorber, thermal stabilizer, pigment, colorant, odor control agent etc.
According to the preferred embodiments of the invention, foamed material 18 has high relatively absorption coefficient.Be not subjected to the constraint of the particular theory that the present invention operates, believe that high relatively absorption coefficient can increase overall transmission loss by the dissipation of sound in foamed material 18.
Fig. 2 shows the sound absorption of various foams.VE represents viscoelastic foam.PCF is with lb/ft
3The density measure of meter.Employed specific VE foam is FOAMEX H300-10N.Plate foam is a melamine and cast foam is an isocyanurate foam.According to the preferred embodiments of the invention, the absorption coefficient of foamed material 18 is about 0.2 or bigger, and more preferably from about 0.4 or bigger, also more preferably from about 0.7 or bigger, most preferably from about 1.0.In the most preferred embodiment, about 1000Hz to the frequency of about 6000Hz absorption coefficient in about scope of 0.7 to 1.
According to the preferred embodiments of the invention, foamed material 18 has low relatively elastic modulus.Be not subjected to the constraint of the particular theory that the present invention operates, believe low relatively elastic modulus allow foamed material 18 more equably contact substrate 16 (as, firewall or vehicle steel construction), and prevent that the side noise from entering vehicle interior.Therefore, preferably has relatively low modulus.Lower modulus allows froth bed 18 easier applying base materials.If modulus is too high, foam 18 will be too firm and be not easy the base material of fitting.Yet, to such an extent as to modulus should be not low do not have a structural intergrity.
Usually, minimum modulus enough allows foam abscess (cells) keep their structure.According to the preferred embodiments of the invention, the elastic modulus of foamed material 18 is about 4 * 10
3Pa is to about 1 * 10
6In the scope of Pa.
In another preferred embodiment, modulus is about 1 * 10
4To about 1 * 10
5Scope in.These scopes are to measure according to test setting shown in Figure 3.
According to the preferred embodiments of the invention, foamed material 18 has the high relatively damping loss factor (tan delta).Be not subjected to the constraint of the particular theory that the present invention operates, believe that the high relatively damping loss factor helps to reduce the vibration in the vehicle steel construction, the overall transmission loss of dividing plate pad before it can increase.According to the preferred embodiments of the invention, the damping loss factor of foamed material 18 (tan delta) is about 0.3 or bigger, and more preferably from about 0.4 or bigger, also more preferably from about 1.0 or bigger.
According to another preferred embodiment of the present invention, the damping loss factor of foamed material 18 (tan delta) is about 0.3 to about 2.0 scope, more preferably about 0.4 to about 2.0 scope, also more preferably about 0.4 to about 1.6 scope.These numerical value are to measure according to test setting shown in Figure 3.
As non-limitative example, satisfy the above foamed material that requires and comprise Dow test viscoelastic polyurethane foam #76-16-06 HW, #76-16-08HW, #76-16-10HW, #056-53-01HW and #056-53-29HW; Foamex 2 pounds every cubic feet (pcf) and FoamexH300-10N 3pcf viscoelastic foam (commercial easily); Carpenter 2.5 pcf viscoelastic foams (commercial easily); And Leggett and Platt viscoelastic foam 25010MF and 30010MF (commercial easily).
The thickness of sound absorbing layer 12 can be dependent on specific application and changes.Although preferred thickness for about 6mm between about 100mm, 12mm about 50mm extremely more preferably from about, also 12mm about 25mm extremely more preferably from about will appreciate that thickness can be dependent on specific application and changes, even beyond these scopes.Thickness is influential to the rigidity of sound absorbing layer 12.Will appreciate that also the thickness variable of sound absorbing layer 12 can be heterogeneous also.
In addition, be appreciated that sound absorbing layer 12 can comprise the combination of material adjacent one another are.That is, sound absorbing layer 12 can comprise the more than one subgrade (sublayer) of similar or dissimilar material.
The normal incident absorption coefficient of sound absorbing layer of the present invention is measured according to ASTM E1050.With reference to figure 2, show three kinds of sample foams, Dow#76-16-10HW and #76-16-08HW and Leggett; The normal incident absorption coefficient of Platt 30010MF distributes.Should be noted that these three kinds of sample foams fall into the preferable range of absorption coefficient, that is, and about scope of 1000 to 8000Hz.
The elastic modulus of sound absorbing layer of the present invention and damping are to use plate, Vib. and two accelerometer measurements.With reference to figure 3, show the summary description of illustrative test.Between accelerometer 1 and accelerometer 2, measure transitivity and determined first resonant frequency of system.Determine elastic modulus by following formula then:
E＝ω
2mt/WL
Wherein: E=elastic modulus (Pa)
ω=angular frequency (rad/s)
M=plate quality (kg)
T=depth of foam (m)
W=plate width (m)
L=plate length (m)
Damping is to use the half-power bandwidth technology to measure from transitivity.
Barrier layer 14 preferably includes the basic impermeable bed of relative thin.The impermeable substantially fluid stream of flowing through of barrier layer 14.According to the preferred embodiments of the invention, barrier layer 14 comprises thermoplastic olefin.Pass through non-limitative example, barrier layer 14 preferably include acrylonitrile-butadiene-styrene (ABS), high-impact polystyrene, polyethylene terephthalate, tygon, polypropylene (as, the polypropylene of filling), the sheet of polyurethane (as, molded polyurethane), ethylene vinyl acetate etc.Barrier layer 14 can comprise that also natural or synthon are used to give intensity.But barrier layer 14 also preferably shape be shaped and retainable, with for any specific application and applying sound absorbing layer 12 and/or base material 16.In addition, barrier layer 14 can comprise organic and/or inorganic filler.In addition, other adjuvant can be introduced barrier layer 14 compositions, such as but not limited to fire retardant, antifoggant, ultraviolet light absorber, thermal stabilizer, pigment, colorant, odor control agent etc.
According to the preferred embodiments of the invention, barrier layer 14 preferably comprises about 15wt.% polypropylene, about 25wt.% thermoplastic elastomer (as, Kraton , commercially available), about 55wt.% pearl filler and about 5wt.% adjuvant (as, processing aid, colorant etc.).
According to the preferred embodiments of the invention, the proportion of barrier layer 14 is preferably about 0.9 or bigger, and more preferably from about 1.4 or bigger, also more preferably from about 1.6 or bigger.Also the surface weight of preferred barrier layer 14 is about .1kg/m
2Or it is bigger.More preferably the surface weight of barrier layer 14 is greater than .4kg/m
2
As absorption layer 12, barrier layer 14 can have the thickness of variation.The thickness of preferred barrier layer 0.1 and 50mm between.In addition, it should be understood that thickness to can be dependent on specific application and change, even beyond preferred range, and thickness also can be heterogeneous.
Although show single barrier layer 14, it should be understood that, can use a plurality of barrier layers 14 of variable thickness.Therefore, each barrier layer 14 can comprise the more than one subgrade of similar or dissimilar material.
As mentioned above, but barrier layer 14 preferably shape be shaped with retainable, to make the adhered shape base material 16 of system 10 for any application.For in conjunction with sound absorbing layer 12 and barrier layer 14, can use any suitable manufacturing technology.Some such examples comprise by heat lamination or by each the layer between apply bonding agent connect each the layer.Such bonding agent can be thermal activation.Also can be during the shape forming technology by making layer heating and in forming tool, exert pressure then, or apply bonding agent to layer and in forming tool, exert pressure then, and bonding each layer.
Base material 16 can comprise the suitable material of any number.As non-limitative example, base material 16 can comprise metal, natural fiber pad, synthon pad, long bullet pulvinus, flexible polyurethane foam, hard polyurethane foams and combination thereof.
Arrive base material 16 about fastening or connection sound absorbing layer 12, can adopt the appropriate method of any number.As non-limitative example, can use machanical fastener, heat fusing, sound wave fusing and/or bonding agent (as, glue, adhesive tape etc.).
Analyze, in preceding dividing plate pad, use the performance benefit of viscoelastic foam of the present invention with respect to the traditional lightweight slab foam structure to show.By checking 0.8mm steel facing and preceding dividing plate mattress system (that is) transmission loss, viscoelastic foam sound absorbing layer and thermoplastic olefin barrier layer, and dividing plate pad performance before determining.Transmission loss is to use the analogy method that is called statistic energy analysis to calculate.This material property of analyzing employing foam and other material calculates transmission loss and other amount with 100 to 10 in the frequency range of 000Hz.
Design variable in the analysis is: (1) foam-type: (a) traditional lightweight slab foam; (b) Dow viscoelastic foam (prescription #76-16-10HW); (c) Foamex 2 pcf viscoelastic foams; (2) barrier layer (as, thermoplastic olefin) proportion: 1.2,1.4 and 1.6; (3) depth of foam: 13mm and 18mm.Should be noted that barrier layer thickness is held constant at 2.4mm.
Preceding dividing plate pad structure is according to typical shock absorber/barrier layer system simulation, shown in Figure 1A is general.Every kind of combination calculation transmission loss for design variable.
With reference to figure 4, be presented at the comparison between the configuration of using various foam-types and various specific gravity barrier under the 18mm depth of foam.Test process is below described.As shown in Figure 4, change foam-type and improved the transmission loss of preceding dividing plate mattress system, particularly 1000 to 10, in the zone of 000Hz to any viscoelastic foam.In addition, change foam-type and increase transmission loss greater than the proportion that when using plate foam, increases barrier layer to any viscoelastic foam.
For more effectively comparing the performance of design variable, the select target configuration.Select target is configured to following configuration: the 18mm traditional slab foam has the barrier layer of 1.4 proportions.Disposing all other viscoelasticity therewith, the performance of target configuration compares.
Sample is placed on the 0.8mm steel plate, and assembly is inserted in the wall between reverberation chamber and the semianechoic room.In reverberation chamber, use loudspeaker to produce noise, and use four microphone measurement sound pressure levels that are placed on apart from steel plate 1.17m.The array of 12 microphones is put into semianechoic room apart from sample outer foam side 0.76m.Use formula 1, according to the puppy parc calculating noise reduction of SAE J1400.What the noise reduction was tested the results are shown in Figure 4.
Formula 1.NR=(average SPL
1Average SPL of)-(
2)
Wherein: SPL
2=noise elimination sound pressure level (dB)
SPL
1=reverberant sound voltage levels (dB)
With reference to figure 5, show and compare the surface weight of all viscoelastic foam configurations with target surface weight.Surface weight (that is, the quality of preceding dividing plate pad structure is divided by the panel area) is used for the relative weight of more every kind of configuration.In the preceding dividing plate pad structure is required than low weight for improved vehicle fuel economy, engine performance etc.The surface weight of three kinds of viscoelastic foam configurations is lower than target.These are: the 13mm Dow viscoelastic foam of (1) 1.2 proportion (prescription #76-16-10HW); (2) 18mm Foamex 2 pcf viscoelastic foams; (3) 13mmFoamex 2 pcf viscoelastic foams.
With reference to figure 6, show and target configuration two kinds of viscoelastic foam configurations relatively.This two kinds of configurations showed viscoelastic foam adopt similar or before more low weight increases the dividing plate dig pass pass the ability of loss.
Test is also finished on the partition part (section) before the GM truck vehicle, to determine the comparing noise reduction ability of viscoelastic foam with dividing plate pad before the traditional slab foam.Owing to be difficult to measure transmission loss for vehicle sections, replace transmission loss so use noise to reduce.Vehicle sections is placed in the wall between reverberation chamber and the anechoic room.Carrying out the sound pressure level measurement in two chambers reduces with calculating noise.
With reference to figure 7, show the result who adopts three kinds of preceding partition part of the same dividing plate pad testing vehicles.The dividing plate pad can be described as before tested three kinds: dividing plate pad before 1.4 proportions that (1) is optimized, promptly before the dividing plate spacer traditional slab foam is arranged and have 1.4 specific gravity barrier (as, TPO); (2) dividing plate pad before 1.8 proportions of You Huaing, promptly before the dividing plate spacer traditional slab foam is arranged and have 1.8 specific gravity barrier (as, TPO); (3) dividing plate pad before 1.4 proportions of You Huaing, promptly before the dividing plate spacer Foamex 2 pcf viscoelastic foams are arranged and have 1.4 specific gravity barrier (as, TPO).Notice, recognize sealing wear problem (particularly show negative dB improved those) for some tests at the 630Hz place.
Fig. 7 explanation is compared with traditional slab foam, has the preceding dividing plate pad of viscoelastic foam according to the present invention until 2000Hz shows better, and be similar to traditional slab foam more than 2000Hz.
12 uses have increased the damping of vibrating on the steel disc metal of application system 10 as sound absorbing layer with viscoelastic foam.This reduction enters the noise radiation of vehicle interior.Viscoelastic foam also reduces the oscillating movement of barrier layer 14 by damping.That is, absorption layer suppresses vibration to barrier layer to reduce the vibration of this barrier layer.Adopt this mode, absorption layer is also as the vibration damping layer.This can cause the increase of the transmission loss of system 10.In addition, viscoelastic foam is owing to the foam structure and the viscoelasticity of foam have good sound absorbing capabilities.Will recognize that viscoelastic foam layers is suitable for placing against (against) base material, place as assembly against vehicle.
Fig. 8 show the condition of equivalent thickness foam various samples damping ratio.First foam of enumerating in the legend is aforesaid viscoelastic foam, but is the 2pcf foam.Second foam of enumerating is the plate foam of 1.2pcf.The weight that has also shown foam sample.Employed plate foam comprises melamine.Adopt manner known in the art to carry out damping test.Adopt vibration to come excited sample.Calculate transition function by acceleration divided by applied force with plate.Adopt this mode, eliminated of the influence of the size of power the result.As shown in Figure 8, viscoelastic foam causes lower level of vibration by higher damping.Therefore, when being used as sound absorbing layer 12 in system 10, viscoelastic foam reduces the oscillating movement of barrier layer 14 by damping.This can increase the transmission loss of overall system.
The damping ratio that Fig. 9 shows the sample with equal mass.Adopt above same way as to test with Fig. 8 related description.
Figure 10 shows against steel placement viscoelastic layer inserting the influence of loss.More specifically, preparation system 10 sample.Sample is made up of viscoelastic foam absorber layer 12, HIPS barrier layer 14 and long bullet hair absorption layer 12.Test is undertaken by following mode: at first will contiguous steel placement of long bullet hair absorption layer and the employing mode definite insertion loss identical with above explanation.Subsequently, by placing the viscoelasticity absorption layer against steel and determining to insert loss and test identical sample.The results are shown in Figure 10.As shown in the figure, when the increase that when steel is placed viscoelastic foam, obtains to insert loss.Therefore, when installation system 10, preferably viscoelastic foam layers is placed against base material, as placing against vehicle assembly.
Figure 11 shows the damping of viscoelastic foam to barrier layer.For the damping of viscoelasticity absorption layer on the test barrier, two samples have been tested.In each case, absorption layer is a viscoelastic foam.In first sample, viscoelastic foam is above definite FOAMEX foam.In second sample, viscoelastic foam comprises also the Qylite available from FOAMEX.Barrier layer all is HIPS in each case.The situation identical with transition function shown in Figure 8 represented in frequency response shown in Figure 11.The test that is used for determining frequency response with above about Fig. 8 illustrate identical.Shown in the result among Figure 11, viscoelastic foam absorber layer reduces the motion or the vibration of barrier layer.This makes less noise transfer to vehicle interior.
Recognize that also use although system 10 is particularly suitable for automobile, it also can be used for other application.Other application like this comprises building, industry, utensil, space flight, truck/motorbus/railway, amusement, sea and Military Application.
Although in above content, describe the present invention for illustrative purposes in detail, it should be understood that, such details only is used for that purpose, and wherein can be changed and do not deviated from the spirit and scope of the present invention by those skilled in the art, unless it is limited by claim.
Claims (19)
1. sound insulation system comprises:
Absorption coefficient about 0.2 to about 1.0 scope and the damping loss factor at about 0.3 sound absorbing layer to about 2.0 the scope.
2. sound insulation system as claimed in claim 1, wherein this sound absorbing layer comprises viscoelastic foam.
3. sound insulation system as claimed in claim 2, wherein the damping loss factor of this viscoelastic foam is in about scope of 0.4 to 1.6.
4. sound insulation system as claimed in claim 3, wherein the elastic modulus of this viscoelastic foam is about 4 * 10
3Pa is to about 1 * 10
6In the scope of Pa.
5. sound insulation system as claimed in claim 4 further comprises the barrier layer that is fixed to this viscoelastic foam, the impermeable substantially fluid stream of flowing through of this barrier layer.
6. sound insulation system as claimed in claim 5, wherein under the frequency of about 1000Hz to about 6000Hz scope, this absorption coefficient of this viscoelastic foam preferably about 0.7 to about 1 scope.
7. sound insulation system as claimed in claim 6 further comprises base material, and this viscoelastic foam is fixed to this base material.
8. sound insulation system as claimed in claim 7, wherein this base material is the metal construction on the vehicle.
9. sound insulation system comprises:
Absorption coefficient about 0.2 to about 1.0 scope and the damping loss factor at about 0.3 sound absorbing layer to about 2.0 the scope; With
Be connected to the barrier layer of this sound absorbing layer and impermeable substantially fluid stream of flowing through.
10. sound insulation system as claimed in claim 1, wherein this sound absorbing layer comprises viscoelastic foam.
11. sound insulation system as claimed in claim 10, wherein the damping loss factor of this viscoelastic foam is in about scope of 0.4 to 1.6.
12. sound insulation system as claimed in claim 11, wherein the elastic modulus of this viscoelastic foam is about 4 * 10
3Pa is to about 1 * 10
6In the scope of Pa.
13. sound insulation system as claimed in claim 12, wherein under the frequency of about 1000Hz to about 6000Hz scope, this absorption coefficient of this viscoelastic foam preferably about 0.7 to about 1 scope.
14. sound insulation system as claimed in claim 13 further comprises base material, this viscoelastic foam is fixed to this base material.
15. sound insulation system as claimed in claim 14, wherein this base material is the metal construction on the vehicle.
16. a sound insulation system comprises:
The sound absorbing layer that contains viscoelastic foam, its absorption coefficient are about 0.7 to about 1 scope under the frequency of about 1000Hz to about 6000Hz scope, and the damping loss factor is in about scope of 0.4 to 1.6; With
Be connected to the barrier layer of this this viscoelastic foam and impermeable substantially fluid stream of flowing through.
17. sound insulation system as claimed in claim 16, wherein the elastic modulus of this viscoelastic foam is about 4 * 10
3Pa is to about 1 * 10
6In the scope of Pa.
18. sound insulation system as claimed in claim 17 further comprises base material, this viscoelastic foam is fixed to this base material.
19. sound insulation system as claimed in claim 18, wherein this base material is the metal construction on the vehicle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US53593304P | 2004-01-12 | 2004-01-12 | |
| US60/535,933 | 2004-01-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1910650A true CN1910650A (en) | 2007-02-07 |
| CN100578609C CN100578609C (en) | 2010-01-06 |
Family
ID=34794374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200580002219A Expired - Fee Related CN100578609C (en) | 2004-01-12 | 2005-01-12 | Automotive dash insulators containing viscoelastic foams |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20050150720A1 (en) |
| EP (1) | EP1706863A1 (en) |
| JP (1) | JP2007519556A (en) |
| KR (1) | KR20060123475A (en) |
| CN (1) | CN100578609C (en) |
| WO (1) | WO2005069273A1 (en) |
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| WO2010060381A1 (en) * | 2008-11-26 | 2010-06-03 | Dow Global Technologies Inc. | Acoustic baffle members and methods for applying acoustic baffles in cavities |
| CN102144255A (en) * | 2008-08-04 | 2011-08-03 | 欧文斯科宁知识产权资产有限公司 | Insulation element for an electrical appliance such as a dishwasher |
| US9790314B2 (en) | 2013-03-05 | 2017-10-17 | Wanhua Chemical (Beijing) Co., Ltd. | Viscoelastic sound-absorbing polyurethane foam and preparation method thereof |
| CN112185330A (en) * | 2020-09-07 | 2021-01-05 | 南京航空航天大学 | Cross transverse reinforcing arrangement partition plate filled viscoelastic material underwater sound absorption structure |
| CN112454921A (en) * | 2020-10-30 | 2021-03-09 | 南通华阁汽车配件有限公司 | Compound automobile sound insulation foam laminating adhesive laminating process |
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- 2005-01-12 KR KR1020067013957A patent/KR20060123475A/en not_active Application Discontinuation
- 2005-01-12 CN CN200580002219A patent/CN100578609C/en not_active Expired - Fee Related
- 2005-01-12 WO PCT/US2005/001524 patent/WO2005069273A1/en active Search and Examination
- 2005-01-12 JP JP2006549688A patent/JP2007519556A/en active Pending
- 2005-01-12 US US11/034,173 patent/US20050150720A1/en not_active Abandoned
- 2005-01-12 EP EP05705846A patent/EP1706863A1/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102144255A (en) * | 2008-08-04 | 2011-08-03 | 欧文斯科宁知识产权资产有限公司 | Insulation element for an electrical appliance such as a dishwasher |
| WO2010060381A1 (en) * | 2008-11-26 | 2010-06-03 | Dow Global Technologies Inc. | Acoustic baffle members and methods for applying acoustic baffles in cavities |
| US9790314B2 (en) | 2013-03-05 | 2017-10-17 | Wanhua Chemical (Beijing) Co., Ltd. | Viscoelastic sound-absorbing polyurethane foam and preparation method thereof |
| CN112185330A (en) * | 2020-09-07 | 2021-01-05 | 南京航空航天大学 | Cross transverse reinforcing arrangement partition plate filled viscoelastic material underwater sound absorption structure |
| CN112185330B (en) * | 2020-09-07 | 2023-07-25 | 南京航空航天大学 | Cross transverse reinforced arrangement partition plate filled viscoelastic material underwater sound absorption structure |
| CN112454921A (en) * | 2020-10-30 | 2021-03-09 | 南通华阁汽车配件有限公司 | Compound automobile sound insulation foam laminating adhesive laminating process |
| CN112454921B (en) * | 2020-10-30 | 2022-07-05 | 南通华阁汽车配件有限公司 | Compound automobile sound insulation foam laminating adhesive laminating process |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007519556A (en) | 2007-07-19 |
| WO2005069273A1 (en) | 2005-07-28 |
| KR20060123475A (en) | 2006-12-01 |
| US20050150720A1 (en) | 2005-07-14 |
| EP1706863A1 (en) | 2006-10-04 |
| CN100578609C (en) | 2010-01-06 |
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