CN105161089A - Sound absorbing device - Google Patents
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- CN105161089A CN105161089A CN201510336790.5A CN201510336790A CN105161089A CN 105161089 A CN105161089 A CN 105161089A CN 201510336790 A CN201510336790 A CN 201510336790A CN 105161089 A CN105161089 A CN 105161089A
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Abstract
The embodiment of the invention discloses a sound absorbing device, and belongs to the field of devices which are used for preventing or reducing energy consumption and standing waves of a sound wave ultralow frequency band (120Hz below). The sound absorbing device comprises a sealing assembly, a supporting frame and a first plate body, and is characterized in that the supporting frame is installed on the wall, the first plate body is installed on the supporting frame, the first plate body, the wall and the supporting frame form a vibration chamber, and the vibration chamber is sealed by the sealing assembly. The invention aims to provide a sound absorbing device so as to effectively reduce the size of an existing small-space ultralow frequency standing wave interference processing device and effectively avoid excessive absorption for high frequency in sound.
Description
Technical field
The present invention relates to the device field for preventing or reduce sound wave, in particular to a kind of sound absorber.
Background technology
Current architectural acoustics is comparative maturity in professional large space such as music hall, venue, and for home theater, this kind of little spatial-acoustic of recording studio because application was general not in the past, on technique direction, be different from more greatly large space acoustics again simultaneously, but in the past the output value too low and ignore by the various acoustic mechanism in the world, research and input also compare less, so there is no the pointed solution of specialty.
The computing formula of standing wave is: standing wave frequency f
0=speed of sound/space opposite distance/2.General little space standing wave seriously can betide the frequency range of 25Hz-125Hz.And can learn from formula, large space acoustics, because opposition reflecting surface distance is larger, is not easy formation standing wave, and spatial volume is also larger, ultra-low frequency energy attenuation also than comparatively fast, so there is the problem of ultralow frequency standing wave hardly in large space acoustics.But little spatial-acoustic therefore singularity, ultralow frequency Stationary Wave has become global difficult point to be solved, and present private savings audiovisual studio is day by day universal, and traditional treating method is also in the processing scheme continuing to use large space acoustics, cannot solve the distinctive Stationary Wave of little spatial-acoustic.
The large space acoustic treatment way that existing little spatial-acoustic standing wave treatment technology is applied mechanically, process standing wave processes with bass trap, and the agent structure of bass trap is the superposition of sound-absorbing porous material, its computing formula is absorption frequency f
0thickness/(numerical value between 10 to 4) of=speed of sound/acoustic absorbant, if such as will absorb the standing wave of 32Hz, calculated thickness is 1.076 meters to 2.6875 meters.Clearly that impossible hold thickness minimum is the bass trap sound absorption structure of 1.076 meters in little spatial-acoustic.
Specialty defines little spatial-acoustic is any one distance of length, width and height lower than 10 meters be little spatial-acoustic, general actual audiovisual studio mostly then is the separate space of the floor area of 8-50 square meter.Be difficult to hold effective enormousness required for bass trap in lower conventional art, absorb because sound-absorbing porous material is full frequency band simultaneously, the lower limit and the thickness that are absorption frequency have relation, and upper frequency limit side is hypersorption, also can cause the problem of taken in excess.
Summary of the invention
The object of the present invention is to provide a kind of sound absorber, while the volume of the treating apparatus disturbed with the ultralow frequency standing wave effectively reducing existing little space, effectively avoid the taken in excess to sound high frequency.
First aspect, a kind of sound absorber provided by the invention, comprise: seal assembly, support frame and the first plate body, described support frame is arranged on metope, described first plate body is arranged on described support frame, described first plate body, described metope and described support frame around cavity form vibration chamber, described seal assembly seals described vibration chamber.
In conjunction with first aspect, the embodiment of the present invention additionally provides the first possibility embodiment of first aspect, wherein, described seal assembly comprises seal pad, described support frame comprises multiple vertical installing plate, multiple described vertical installing plate interval is arranged on described metope and forms vertical fence, described first plate body is arranged on described vertical fence, described vibration chamber by described first plate body, described metope and described vertical fence around cavity form, described vibration chamber is sealed to airtight chamber by described seal pad.
In conjunction with the first possibility embodiment of first aspect, the embodiment of the present invention additionally provides the second possibility embodiment of first aspect, wherein, described support frame also comprises multiple horizontal installing plate, multiple described horizontal installing plate interval is arranged on described vertical fence and forms horizontal fence, described first plate body is arranged on described horizontal fence, described vibration chamber by described first plate body, described metope, described vertical fence and described horizontal fence around cavity form, described vibration chamber is sealed to airtight chamber by described seal pad.
In conjunction with the second possibility embodiment of first aspect, the embodiment of the present invention additionally provides the third possibility embodiment of first aspect, and wherein, described horizontal installing plate is arranged on described vertical fence by self-tapping screw nail; The screw rod of described self-tapping screw nail is arranged with iron glue Composition spacer, during use, between the nut that described iron glue Composition spacer is followed closely at described horizontal installing plate and described self-tapping screw.
In conjunction with the third possibility embodiment of first aspect, the embodiment of the present invention additionally provides the 4th kind of possibility embodiment of first aspect, and wherein, described vertical installing plate is provided with mounting hole, described self-tapping screw nail bit enters in described mounting hole, is plugged with rubber blanket in described mounting hole.
In conjunction with the 4th kind of possibility embodiment of first aspect, the embodiment of the present invention additionally provides the 5th kind of possibility embodiment of first aspect, and wherein, the one side away from described metope of described first plate body is stacked is provided with the second plate body.
In conjunction with first aspect or first aspect the first may embodiment or the second may embodiment or the third may embodiment or the 4th kind may embodiment or the 5th kind may embodiment, the embodiment of the present invention additionally provides the 6th kind of possibility embodiment of first aspect, wherein, the span of the thickness of described first plate body is 2.8 millimeters to 12.2 millimeters.
In conjunction with the 6th kind of possibility embodiment of first aspect, the embodiment of the present invention additionally provides the 7th kind of possibility embodiment of first aspect, and wherein, described first plate body is scale board, and the thickness of described first plate body is 12 millimeters.
In conjunction with the 5th kind of possibility embodiment of first aspect, the embodiment of the present invention additionally provides the 8th kind of possibility embodiment of first aspect, wherein, described second plate body is plasterboard, the thickness of described second plate body is 9 millimeters, described first plate body is scale board, and the span of the thickness of described first plate body is 2.8 millimeters to 12.2 millimeters.
May embodiment in conjunction with the 8th kind of first aspect, the embodiment of the present invention additionally provides the 9th kind of first aspect may embodiment, and wherein, the thickness of described first plate body is any one of 9 millimeters, 5 millimeters, 3 millimeters and 12 millimeters.
In the embodiment of the present invention, the bracing frame of support frame is a centre that a multiple framing component surrounds to be empty surrounding be framing component, similar window frame or doorframe, there is certain thickness, described frame installation on the wall, namely the framing component of surrounding is fixing on the wall, again the first plate body is installed on the support frame, the mode of installing can be, the periphery of described first plate body is arranged in the framed structure of the surrounding of support frame, then has seal assembly will to form vibration cavity seal between described first plate body, described metope and described support frame.
Therefore, the thickness of support frame determines the thickness of the air layer of described vibration chamber, described vibration chamber forms an occluded air layer, namely a vibrational system is constituted, the resonant frequency of described vibrational system and the relevant with the air layer thickness of wall, the mass area ratio of the first plate body etc. of the first plate body, according to the frequency of sound to be absorbed, the thickness of choose reasonable first plate body and air layer thickness, the sound absorber that the embodiment of the present invention is provided, when Speech input, produces resonance.The vibration frequency of the first plate body and frequency of sound wave are matched, resonates, and then make acoustic wave energy be converted into the kinetic energy of physical vibration, acoustic wave energy is consumed by kinetic energy, thus play the function of the sound wave absorbing certain frequency.
Different from the employing sound-absorbing porous material process little spatial-acoustic problem of prior art, sound-absorbing porous material volume is excessive to be compared, the embodiment of the present invention is by the resonance sound-absorbing of the first plate body, completely different from the principle of sound-absorbing porous material, when avoiding existing employing sound-absorbing porous material process little spatial-acoustic problem, volume is excessive.
In addition, absorption sound wave frequency is relevant with the thickness of the first plate body, and thickness one timing, the frequency that can absorb sound is certain, avoids the absorption of the sound to all frequencies, effectively avoids taken in excess spatial model being caused to the sound frequency beyond standing wave frequency.
Other features and advantages of the present invention are set forth at instructions subsequently, and, partly become apparent from instructions, or understand by implementing the embodiment of the present invention.Object of the present invention and other advantages realize by structure specifically noted in write instructions, claims and accompanying drawing and obtain.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.Shown in accompanying drawing, above-mentioned and other object of the present invention, Characteristics and advantages will be more clear.Reference numeral identical in whole accompanying drawing indicates identical part.Deliberately do not draw accompanying drawing by physical size equal proportion convergent-divergent, focus on purport of the present invention is shown.
Fig. 1 shows the structural drawing of a kind of sound absorber that the embodiment of the present invention provides;
Fig. 2 shows the structural drawing of the another kind of sound absorber that the embodiment of the present invention provides;
Fig. 3 shows the structural drawing of the another kind of sound absorber that the embodiment of the present invention provides;
Fig. 4 shows the remaining frequency response after the frequency response curve of the space sound wave without described sound absorber process that the embodiment of the present invention provides and 250 milliseconds;
Fig. 5 shows the remaining frequency response after the frequency response curve of the space sound wave through described sound absorber process that the embodiment of the present invention provides and 250 milliseconds;
The matched curve without described sound absorber process and the frequency response through the space sound wave of described sound absorber process that Fig. 6 shows that the embodiment of the present invention provides.
Reference numeral: support frame 101, the first plate body 102, second plate body 103, seal pad 104, vertical installing plate 201, horizontal installing plate 202, self-tapping screw nail 203.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, carry out clear, complete description to the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Current architectural acoustics is comparative maturity in professional large space such as music hall, venue, and for home theater, this kind of little spatial-acoustic of recording studio because application was general not in the past, on technique direction, be different from more greatly large space acoustics again simultaneously, but in the past the output value too low and ignore by the various acoustic mechanism in the world, research and input also compare less, so there is no the pointed solution of specialty.
The computing formula of standing wave is: standing wave frequency f
0=speed of sound/space opposite distance/2.General little space standing wave seriously can betide the frequency range of 25Hz-125Hz.And can learn from formula, large space acoustics, because opposition reflecting surface distance is larger, is not easy formation standing wave, and spatial volume is also larger, ultra-low frequency energy attenuation also than comparatively fast, so there is the problem of ultralow frequency standing wave hardly in large space acoustics.But little spatial-acoustic therefore singularity, ultralow frequency Stationary Wave has become global difficult point to be solved, and present private savings audiovisual studio is day by day universal, and traditional treating method is also in the processing scheme continuing to use large space acoustics, cannot solve the distinctive Stationary Wave of little spatial-acoustic.
The large space acoustic treatment way that existing little spatial-acoustic standing wave treatment technology is applied mechanically, process standing wave processes with bass trap, and the agent structure of bass trap is the superposition of sound-absorbing porous material, its computing formula is absorption frequency f
0thickness/(numerical value between 10 to 4) of=speed of sound/acoustic absorbant, if such as will absorb the standing wave of 32Hz, calculated thickness is 1.076 meters to 2.6875 meters.Clearly that impossible hold thickness minimum is the bass trap sound absorption structure of 1.076 meters in little spatial-acoustic.
Specialty defines little spatial-acoustic is any one distance of length, width and height lower than 10 meters be little spatial-acoustic, general actual audiovisual studio mostly then is the separate space of the floor area of 8-50 square meter.Be difficult to hold effective enormousness required for bass trap in lower conventional art, absorb because sound-absorbing porous material is full frequency band simultaneously, the lower limit and the thickness that are absorption frequency have relation, and upper frequency limit side is hypersorption, also can cause the problem of taken in excess.
Therefore, in order to overcome above-mentioned difficulties, in order to the volume that effectively reduces the treating apparatus of the ultralow frequency standing wave interference in existing little space and the taken in excess effectively avoiding sound frequency, embodiments provide a kind of sound absorber, as shown in Figure 1, described sound absorber comprises: support frame 101 and the first plate body 102, in the embodiment of the present invention, the bracing frame of support frame 101 is a centre that a multiple framing component surrounds to be empty surrounding be framing component, as shown in Figure 1, similar window frame or doorframe, described support frame 101 is arranged on metope, described first plate body 102 is arranged on described support frame 101.The mode of installing can be, the size of described first plate body 102 is mated with the size of described support frame 101, the periphery of described first plate body 102 is arranged on four frames of described support frame 101, therefore, a vibration chamber is just constituted between described first plate body 102, described support frame 101 and described metope.
As shown in Figure 1, also comprise seal assembly, described seal assembly seals described vibration chamber, and concrete sealing means can be, the described gap of seal assembly sealing between the described periphery of the first plate body 102, the frame of described support frame 101 and described metope.
The principle of the resonance sound-absorbing that the embodiment of the present invention provides is as follows:
The blank perimeter such as scale board, hardboard, plasterboard, cement asbestos board, sheet metal are fixed on framework, and the occluded air layer after through plate, also forms vibrational system.The resonant frequency f of this structure
0available following formula calculates:
In above formula, ρ
0represent atmospheric density, c represents the speed of sound in air, M
0the mass area ratio of display plate, the i.e. surface density of the first plate body 102 described in the embodiment of the present invention, air layer thickness before L display plate and wall, K represents the rigidity factor of described sound absorber structure, and the elasticity of K and plate, skeleton structure, installation situation are relevant.
For rectangular slab, the length of side is a and b, and thickness is h, then K is:
E is dynamic elasticity (Young) the film amount of plate material, and σ is Poisson ratio.For general sheet material under ordinary construction condition, K=(1 ~ 3) * 10
6kg/ (m
2* S
2).When the rigidity factor K of plate and air layer L is smaller, then resonant frequency f
0computing formula in radical sign in Section 2 more much smaller than Section 1, then Section 2 can be omitted.But when L value is larger, more than 100cm, in radical sign, Section 1 will be more much smaller than Section 2, and resonant frequency has just almost had nothing to do with air layer thickness.
In the embodiment of the present invention, the thickness of described support frame 101 is 50 millimeters, and the thickness of the air layer therefore between described first plate body 102 and described metope is 50 millimeters, and the span of the thickness of described first plate body 102 is 2.8 millimeters to 12.2 millimeters.
Many experiments through inventor is summed up, and the embodiment of the present invention can absorption frequency be effectively the energy of the low-frequency sound wave of 25Hz to 100Hz.
Such as, described first plate body 102 is scale board, when thickness is 12 millimeters, be that sound wave acoustically effective between 25Hz to 54Hz is remarkable to standing wave frequency, especially be the sound wave between 38Hz to 52Hz to frequency, first plate body 102 absorbs frequency when being the sound wave between 38Hz to 52Hz, the vibration of the first plate body 102 is violent, the acceleration of the vibration of the first plate body 102 and the numerical value of displacement larger, vibration is violent, vibration displacement is larger, illustrate that the energy of the sound wave that the first plate body 102 absorbs almost is converted to the kinetic energy of the first plate body 102 completely, be used for doing mechanical motion, sound wave is consumed.Such as, when standing wave frequency is 51Hz, more than 7 times that the vibration acceleration of the first plate body 102 is standing wave frequency when being 25Hz, vibration displacement is close to 4 times, when described first plate body 102 is the scale board of 12 millimeters, when air layer thickness is 50 millimeters, very good to the assimilation effect of the sound wave of 51Hz.
Therefore, the thickness of support frame 101 determines the thickness of the air layer of described vibration chamber, described vibration chamber forms an occluded air layer, namely a vibrational system is constituted, the resonant frequency of described vibrational system and the first plate body 102 with the air layer thickness of wall, the mass area ratios of the first plate body 102 etc. are relevant, according to the frequency of sound to be absorbed, the thickness of choose reasonable first plate body 102 and air layer thickness, the sound absorber that the embodiment of the present invention is provided is when Speech input, produce resonance, the vibration frequency of the first plate body 102 and frequency of sound wave are matched, resonate, and then make acoustic wave energy be converted into the kinetic energy of physical vibration, acoustic wave energy is consumed by kinetic energy, thus play the function of the sound wave absorbing certain frequency.
Different from the employing sound-absorbing porous material process little spatial-acoustic problem of prior art, sound-absorbing porous material volume is excessive to be compared, the embodiment of the present invention is by the resonance sound-absorbing of the first plate body 102, completely different from the principle of sound-absorbing porous material, when avoiding existing employing sound-absorbing porous material process little spatial-acoustic problem, volume is excessive.
In addition, absorption sound wave frequency is relevant with the thickness of the first plate body 102, thickness one timing, and the frequency that can absorb sound is certain, avoid the absorption of the sound to all frequencies, effectively avoid taken in excess spatial model being caused to the sound frequency beyond standing wave frequency.
In addition, as shown in Figure 2, the another kind of sound absorber that the embodiment of the present invention provides, comprise: multiple vertical installing plate 201, seal pad 104, first plate body 102 and the second plate body 103, multiple described vertical installing plate 201 interval is arranged on the vertical fence described metope formed as shown in Figure 2, described first plate body 102 is arranged on described vertical fence, and the described vibration chamber formed between described first plate body 102, described metope and described vertical fence is sealed to airtight chamber by described seal pad 104.
In the embodiment of the present invention, the structure of described sound absorber can be:
The thickness of described vertical installing plate 201 is 50 millimeters, described first plate body 102 is the scale board of rectangle, the width of described first plate body 102 equals the length of described vertical installing plate 201, two limits of the width of described first plate body 102 are arranged on the dual-side of vertical fence respectively, two limits of the length of the first described plate body 102 are arranged on the two other limit of vertical fence, with seal pad 104, the surrounding of sound absorber is sealed, make the space between the periphery of the periphery of the first plate body 102 and vertical fence and metope airtight, make the first plate body 102, the described vibration chamber formed between described metope and described vertical fence is airtight chamber.
Embodiment is as shown in Figure 1 known, the frequency of sound absorption is relevant with the thickness of the first plate body 102, described first plate body 102 is scale board, when thickness is 12 millimeters, be that sound wave acoustically effective between 25Hz to 54Hz is remarkable to standing wave frequency, especially be the sound wave between 38Hz to 52Hz to frequency, first plate body 102 absorbs frequency when being the sound wave between 38Hz to 52Hz, the vibration of the first plate body 102 is violent, the acceleration of the vibration of the first plate body 102 and the numerical value of displacement larger, vibration is violent, vibration displacement is larger, illustrate that the energy of the sound wave that the first plate body 102 absorbs almost is converted to the kinetic energy of the first plate body 102 completely, be used for doing mechanical motion, sound wave is consumed.Such as, when standing wave frequency is 51Hz, more than 7 times that the vibration acceleration of the first plate body 102 is standing wave frequency when being 25Hz, vibration displacement is close to 4 times, when described first plate body 102 is the scale board of 12 millimeters, when air layer thickness is 50 millimeters, very good to the assimilation effect of the sound wave of 51Hz.
In addition, the embodiment of the present invention can also on the surface away from metope of the first plate body 102 stacked second plate body 103, now, by described first plate body 102 with described second plate body 103 is stacked forms one piece of plate body, such as, described second plate body 103 is the plasterboard of 9 millimeters, in the embodiment of the present invention, described second plate body 103 is plasterboard, and can not only coincide resonant frequency, but also for paint coating during room finish or can provide convenient when pasting wallpaper.
The span of the thickness of described first plate body 102 is 2.8 millimeters to 12.2 millimeters, and concrete can have following several preferably selection:
When the scale board that the first plate body 102 is 12 millimeters, when second plate body 103 is the plasterboard of 9 millimeters, when standing wave frequency in little space is between 29Hz to 49Hz, the vibration of certain displacement can be there is in the combined plate body of described first plate body 102 and the second plate body 103, especially when standing wave frequency node is that vibration between 30.945Hz to 36Hz and 40Hz to 48Hz is especially violent, wherein, when standing wave frequency is 33Hz, the vibration acceleration of the combined plate body that described first plate body 102 and described second plate body 103 are formed, speed and displacement reach maximal value, namely best to the assimilation effect of the sound wave of 33Hz.Therefore, the plasterboard of the scale board of 12 millimeters and 9 millimeters and and metope between the standing wave frequency of airtight vibration chamber to little space sound field that form of air layer be assimilation effect between 30.945Hz to 36Hz and 40Hz to 48Hz clearly, and be that the assimilation effect of the sound wave of 33Hz is best to the standing wave frequency of little space sound field.
When the scale board that the first plate body 102 is 9 millimeters, when second plate body 103 is the plasterboard of 9 millimeters, for the sound wave of standing wave frequency node between 30Hz to 46Hz in little space, the vibration of described first plate body 102 and described second plate body 103 is more violent, vibration between 38Hz to 41Hz clearly, especially when standing wave frequency is near 40Hz, the vibration acceleration of the first plate body 102 and the second plate body 103, speed and displacement all reach maximal value, therefore, the plasterboard of the scale board of 9 millimeters and 9 millimeters and and metope between the standing wave frequency of airtight vibration chamber to little space sound field that form of air layer be assimilation effect between 38Hz to 41Hz clearly, and be that the assimilation effect of the sound wave of 40Hz is best to the standing wave frequency of little space sound field.
When the scale board that the first plate body 102 is 5 millimeters, when second plate body 103 is the plasterboard of 9 millimeters, the sound wave of standing wave frequency node between 30Hz to 54Hz for little space can make described first plate body 102 and described second plate body 103 vibrate, and vibration between 41Hz to 54Hz clearly, especially when standing wave frequency is 53Hz, the vibration acceleration of the first plate body 102 and the first plate body 102, speed and displacement all reach maximal value, therefore, the plasterboard of the scale board of 5 millimeters and 9 millimeters and and metope between the standing wave frequency of airtight vibration chamber to little space sound field that form of air layer be assimilation effect between 41Hz to 54Hz clearly, and be that the assimilation effect of the sound wave of 53Hz is best to the standing wave frequency of little space sound field.
Firstth plate body 102 is the scale board of 3 millimeters, when second plate body 103 is the plasterboard of 9 millimeters, the sound wave of standing wave frequency node between 30Hz to 54Hz for little space can make described first plate body 102 and described second plate body 103 vibrate, and vibration between 44Hz to 52Hz clearly, especially, when standing wave frequency is 47Hz and 49Hz, the vibration acceleration of the first plate body 102 and the first plate body 102, speed and displacement all reach maximal value.Therefore, the plasterboard of the scale board of 3 millimeters and 9 millimeters and and metope between the standing wave frequency of airtight vibration chamber to little space sound field that form of air layer be assimilation effect between 44Hz to 52Hz clearly, and be that the assimilation effect of the sound wave of 47Hz and 49Hz is best to the standing wave frequency of little space sound field.
Moreover as shown in Figure 3, the embodiment of the present invention additionally provides another kind of sound absorber, comprising: the first plate body 102, second plate body 103, multiple vertical installing plate 201, multiple horizontal installing plate 202 and seal pad 104.
In the embodiment of the present invention, the rough ground for being of a size of 30 millimeters * 50 millimeters of described vertical installing plate 201, the i.e. rectangle of the xsect of described vertical installing plate 201 to be length be 50 mm wide 30 millimeters, therefore the rectangular parallelepiped plate of described vertical installing plate 201, the wide of wherein two faces of described vertical installing plate 201 is 50 millimeters, described vertical installing plate 201 wide is that the face of 50 millimeters is adjacent on metope, other vertical installing plate 201 also adopts before this mode is arranged on, the length direction level of multiple vertical installing plate 201, and the vertical central point of multiple vertical installing plate 201 is positioned on a horizontal line.The concrete thickness of described vertical installation version and described horizontal installing plate 202 can be determined according to the intrinsic standing wave node in space.
In the embodiment of the present invention, multiple vertical installing plate 201 is arranged on metope by damping nail, and described damping nail can ensure described vertical installing plate 201 with body of wall without rigid contact.
In the punching of 300 millimeters, the interval from one end of length direction of each vertical installing plate 201, and rubber blanket is filled in each hole, with self-tapping screw nail 203, horizontal installing plate 202 is fixed in the hole of described vertical installing plate 201, the screw rod of described self-tapping screw nail 203 is arranged with iron glue Composition spacer, during use, described iron glue Composition spacer is followed closely between the nut of 203 at described horizontal installing plate 202 and described self-tapping screw.
In the embodiment of the present invention, described horizontal installing plate 202 level is arranged on described vertical installing plate 201, the length direction of described horizontal installing plate 202 is vertical with the length direction of described vertical installing plate 201, the xsect of described horizontal installing plate 202 is of a size of 20 millimeters * 30 millimeters, and described horizontal installing plate 202 is rough ground.As shown in Figure 3, described vertical installing plate 201 constitutes a vertical fence, and two horizontal installing plates 202 are corresponding to be respectively arranged on two horizontal sides of vertical fence.
By self-tapping screw nail 203, described first plate body 102 is fixedly mounted on described horizontal installing plate 202, the stacked one side away from metope being arranged on described first plate body 102 of described second plate body 103.
The airtight sealing of surrounding of the resonant cavity described first plate body 102, described second plate body 103, described vertical installation version and described horizontal installing plate 202 and metope formed by seal pad 104.
Therefore, described rubber blanket and described iron glue Composition spacer can to reduce when the first plate body 102 and the second plate body 103 vibrate described damage of laterally installing version, play the effect of buffering.
Described first plate body 102 and the distance before metope are the thickness sum of horizontal installing plate 202 and vertical installing plate 201, be 50 millimeters, the span of the thickness of described first plate body 102 is 2.8 millimeters to 12.2 millimeters, and concrete can have following several preferably selection:
When the scale board that the first plate body 102 is 12 millimeters, when second plate body 103 is the plasterboard of 9 millimeters, when standing wave frequency in little space is between 29Hz to 49Hz, the vibration of certain displacement can be there is in the combined plate body of described first plate body 102 and the second plate body 103, especially when standing wave frequency node is that vibration between 30.945Hz to 36Hz and 40Hz to 48Hz is especially violent, wherein, when standing wave frequency is 33Hz, the vibration acceleration of the combined plate body that described first plate body 102 and described second plate body 103 are formed, speed and displacement reach maximal value, namely best to the assimilation effect of the sound wave of 33Hz.Therefore, the plasterboard of the scale board of 12 millimeters and 9 millimeters and and metope between the standing wave frequency of airtight vibration chamber to little space sound field that form of air layer be assimilation effect between 30.945Hz to 36Hz and 40Hz to 48Hz clearly, and be that the assimilation effect of the sound wave of 33Hz is best to the standing wave frequency of little space sound field.
As shown in Figure 4, Figure 5 and Figure 6, horizontal ordinate expression sound wave frequency, ordinate represents the loudness of sound wave, unit is dB, solid line in Fig. 4 represents the actual measurement frequency response curve of the sound wave without described sound absorber process, and the dotted line in Fig. 4 represents the frequency response curve of the sound wave residual amount of energy after 250 milliseconds without described sound absorber process.Solid line in Fig. 5 represents the actual measurement frequency response curve of the sound wave after described sound absorber process, and the dotted line in Fig. 5 represents the frequency response curve of the sound wave residual amount of energy after 250 milliseconds after described sound absorber process.In Fig. 6, solid line represents the actual measurement frequency response curve of the sound wave without described sound absorber process, and dotted line represents the actual measurement frequency response curve of the sound wave through described sound absorber process.
As seen from Figure 4, sound wave without described sound absorber process has extremely strong standing wave energy to continue at about 31Hz, and whole ultralow frequency is almost difficult to dissipate 250 milliseconds of self-energys, comparison diagram 4 and Fig. 5 can find out, after described sound absorber process, decay to 56dB at 30Hz standing wave node after 250 milliseconds from 84dB, damping capacity is 31dB, and non-standing wave node beyond 30Hz almost complete attenuation is to below 40dB, suitable with neighbourhood noise.Except about 31Hz also has very slight acoustic wave energy, other frequencies consume totally completely.
Therefore, different from the employing sound-absorbing porous material process little spatial-acoustic problem of prior art, sound-absorbing porous material volume is excessive to be compared, the embodiment of the present invention is by the resonance sound-absorbing of the first plate body 102, or pass through the resonance sound-absorbing of the combination of the first plate body 102 and the second plate body 103, completely different from the principle of sound-absorbing porous material, when avoiding existing employing sound-absorbing porous material process little spatial-acoustic problem, volume is excessive.
In addition, absorption sound wave frequency is relevant with the thickness of the first plate body 102, and thickness one timing, the frequency that can absorb sound is certain, avoids the absorption of the sound to all frequencies, effectively avoids the taken in excess to sound frequency.Precisely acoustic energy consumption absorption can be carried out for the intrinsic standing wave node in each space in little spatial-acoustic, such as, when the first plate body 102 to be the scale board of 12 millimeters and the second plate body 103 be the plasterboard of 9 millimeters is combined into two-layer compound sheet material, during the low frequency audio sound of woofer playback 25Hz to the 40Hz in little space, will be there is the resonance motion matched with frequency of sound wave in the two-layer compound sheet material that the embodiment of the present invention provides, acoustic wave energy changes into the kinetic energy of physical vibration.When frequency is 33Hz, the acceleration of two-layer compound sheet material, speed and displacement reach maximal value, confirm that the centre frequency of this two-layer compound sheet material is 33Hz, have the strongest energy ezpenditure to the sound wave of frequency centered by 33Hz.
In addition, those skilled in the art are on the basis of reading the embodiment of the present invention, can expect except Fig. 1 easily, the structure of the embodiment outside Fig. 2 and Fig. 3, and, the material of described first plate body 102 can also be scale board, hardboard, plasterboard, gypsum cement plate, other the material such as sheet metal or Europe deals, the concrete material of the first plate body 102 and the selection of thickness, can according to the standing wave node in little space, the relational expression of resonant frequency and the thickness of air layer of the first plate body 102 of unlike material thickness decide, therefore, within the spirit and principles in the present invention all, any amendment of doing, equivalent replacement, improve, all should be included within protection scope of the present invention.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a sound absorber, it is characterized in that, comprise: seal assembly, support frame and the first plate body, described support frame is arranged on metope, described first plate body is arranged on described support frame, described first plate body, described metope and described support frame around cavity form vibration chamber, described seal assembly seals described vibration chamber.
2. sound absorber according to claim 1, it is characterized in that, described seal assembly comprises seal pad, described support frame comprises multiple vertical installing plate, multiple described vertical installing plate interval is arranged on described metope and forms vertical fence, described first plate body is arranged on described vertical fence, described vibration chamber by described first plate body, described metope and described vertical fence around cavity form, described vibration chamber is sealed to airtight chamber by described seal pad.
3. sound absorber according to claim 2, it is characterized in that, described support frame also comprises multiple horizontal installing plate, multiple described horizontal installing plate interval is arranged on described vertical fence and forms horizontal fence, described first plate body is arranged on described horizontal fence, described vibration chamber by described first plate body, described metope, described vertical fence and described horizontal fence around cavity form, described vibration chamber is sealed to airtight chamber by described seal pad.
4. sound absorber according to claim 3, is characterized in that, described horizontal installing plate is arranged on described vertical fence by self-tapping screw nail; The screw rod of described self-tapping screw nail is arranged with iron glue Composition spacer, during use, between the nut that described iron glue Composition spacer is followed closely at described horizontal installing plate and described self-tapping screw.
5. sound absorber according to claim 4, is characterized in that, described vertical installing plate is provided with mounting hole, and described self-tapping screw nail bit enters in described mounting hole, is plugged with rubber blanket in described mounting hole.
6. sound absorber according to claim 5, is characterized in that, the one side away from described metope of described first plate body is stacked is provided with the second plate body.
7., according to arbitrary described sound absorber of claim 1-6, it is characterized in that, the span of the thickness of described first plate body is 2.8 millimeters to 12.2 millimeters.
8. sound absorber according to claim 7, is characterized in that, described first plate body is scale board, and the thickness of described first plate body is 12 millimeters.
9. sound absorber according to claim 6, is characterized in that, described second plate body is plasterboard, and the thickness of described second plate body is 9 millimeters, and described first plate body is scale board, and the span of the thickness of described first plate body is 2.8 millimeters to 12.2 millimeters.
10. sound absorber according to claim 9, is characterized in that, the thickness of described first plate body is any one of 9 millimeters, 5 millimeters, 3 millimeters and 12 millimeters.
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