阅读说明：本技术 一种驾驶舱消音套件 (Cockpit amortization external member ) 是由 饶建渊 靳春梅 钟立元 邱优峰 熊飞 刘飞 王新 李书晓 韩亮 路怀华 于 2020-06-10 设计创作，主要内容包括：本申请实施例提供一种驾驶舱消音套件,所述消音套件安装至驾驶舱内的箱体结构内,包括：至少三层结构层以及至少一层多孔介质吸声层,所述至少三层结构层叠加构成具有多个扩张腔的消音器,每层结构层具有不同厚度以及大小的通孔,所述多孔介质吸声层位于所述箱体结构内。本申请实施例中令至少三层结构层叠加构成具有多个扩张腔的消音器,实现消音降噪,通过每层结构层具有不同厚度以及大小的通孔,从而使得消音套件在更大的频率范围都能有良好的消音效果。(The embodiment of the application provides a cockpit amortization external member, in the box structure of amortization external member installation to the cockpit, include: at least three-layer structure layer and at least one deck porous medium sound absorbing layer, at least three-layer structure layer stack constitutes the muffler that has a plurality of expansion chambeies, and every layer of structure layer has different thickness and the through-hole of size, porous medium sound absorbing layer is located in the box structure. Make at least three-layer structural layer stack to constitute the muffler that has a plurality of expansion chambeies in this application embodiment, realize the amortization and fall the noise, have different thickness and the through-hole of size through every layer structural layer to make the amortization external member can both have good noise cancelling effect at bigger frequency range.)

1. The utility model provides a cockpit amortization external member, its characterized in that, in the box structure of amortization external member installation to the cockpit includes: at least three-layer structure layer and at least one deck porous medium sound absorbing layer, at least three-layer structure layer stack constitutes the muffler that has a plurality of expansion chambeies, and every layer of structure layer has different thickness and the through-hole of size, porous medium sound absorbing layer is located in the box structure.

2. The cabin silencing kit of claim 1, wherein the relative positions of the at least three structural layers are adaptively adjusted according to a frequency range of noise in the vehicle.

3. The cabin silencing kit of claim 1, wherein the relative positions of the at least three structural layers are adaptively adjusted according to a frequency range of noise in the vehicle and the box structure.

4. The cabin silencing kit of claim 1, wherein the through hole of each of the at least three structural layers is located.

5. The cabin silencing kit of claim 1, wherein said sound absorbing layer of porous medium is located on the surface of a silencer having a plurality of expansion chambers formed by stacking said at least three structural layers.

6. The cabin silencing kit of claim 1, wherein said porous media sound absorbing layer is located on a surface of an interior cavity of said box structure.

7. The cockpit silencing kit of claim 6, further comprising: the baffle plate is arranged in the inner cavity of the box body structure, and the frequency range of noise in the vehicle is changed by changing the space structure of the inner cavity of the box body structure.

8. The cabin silencing kit of any one of claims 2 to 7, further comprising: and the electronic control unit is used for controlling the relative positions of the at least three structural layers to be adjusted according to the noise characteristic of the cockpit and the use working condition of the vehicle.

9. The cabin silencing kit of claim 8, wherein said electronic control unit is further configured to control said adaptively movable partition to adjust the installation position based on the cabin noise characteristics and the vehicle operating conditions.

10. The cabin silencing kit of claim 9, wherein said electronic control unit controls the relative position of said at least three structural layers to be adjusted and controls the installation position of said adaptively movable position partition to be adjusted by controlling the motor-operated actuator.

Technical Field

The embodiment of the application relates to the technical field of automobiles, in particular to a cockpit silencing kit.

Background

In recent years, with the rapid development of the automobile industry, people have higher and higher requirements on the sound field environment in the automobile, and the silencing kit is usually integrated in box bodies or cavity structures such as a subwoofer box body, an air conditioner box, a glove box, a blower box body and a beam cavity and is matched with the cockpit structure and the sound field environment to absorb noise in the cockpit so as to carry out silencing.

The main structure of a common silencing kit is convenient to fix on an air door of an air conditioning box, a shell of a blower and a shell of the air conditioning box. The forms are divided into three types, namely a flat plate type, a smooth type and a non-smooth type, and the corresponding forms are selected according to the specific structure of the installed box body, and the structure layers of the through holes with the same aperture of the silencing sleeve are superposed to form the silencing sleeve, so that the silencing sleeve can only carry out silencing treatment on noises with specific frequency, and cannot realize silencing treatment on noises with various frequencies.

Disclosure of Invention

In view of the above, one of the technical problems to be solved by the embodiments of the present application is to provide a cabin silencing kit, which overcomes some or all of the above technical problems.

The embodiment of the application provides a cockpit amortization external member, in the box structure of amortization external member installation to the cockpit, include: at least three-layer structure layer and at least one deck porous medium sound absorbing layer, at least three-layer structure layer stack constitutes the muffler that has a plurality of expansion chambeies, and every layer of structure layer has different thickness and the through-hole of size, porous medium sound absorbing layer is located in the box structure.

Optionally, the relative position of the at least three structural layers is adaptively adjusted according to the frequency range of the in-vehicle noise.

Optionally, the relative positions of the at least three structural layers are adaptively adjusted according to the frequency range of the noise in the vehicle and the box structure.

Optionally, the position of the through hole of each structural layer of the at least three structural layers.

Optionally, the porous medium sound absorption layer is positioned on the surface of the silencer with a plurality of expansion cavities formed by overlapping the at least three structural layers.

Optionally, the porous medium sound absorption layer is positioned on the surface of the inner cavity of the box body structure.

Optionally, the acoustic abatement kit further comprises: the baffle plate is arranged in the inner cavity of the box body structure, and the frequency range of the noise in the vehicle is changed by changing the space structure of the inner cavity of the box body structure.

Optionally, the cockpit silencing kit further comprises: and the electronic control unit is used for controlling the relative positions of the at least three structural layers to be adjusted according to the noise characteristic of the cockpit and the use working condition of the vehicle.

Optionally, the electronic control unit is further configured to control the partition board in the adaptive moving position to adjust the installation position according to the cockpit noise characteristic and the vehicle use condition.

Optionally, the electronic control unit controls the relative position of the at least three structural layers to be adjusted and controls the partition board in the adaptive moving position to be adjusted in the installation position by controlling the motor to operate the actuating mechanism.

In the box structure of amortization external member installation to cockpit in this application embodiment includes: at least three-layer structure layer and at least one deck porous medium sound absorbing layer, at least three-layer structure layer stack constitutes the muffler that has a plurality of expansion chambeies, and every layer of structure layer has different thickness and the through-hole of size, porous medium sound absorbing layer is located in the box structure. Make at least three-layer structural layer stack to constitute the muffler that has a plurality of expansion chambeies in this application embodiment, realize the amortization and fall the noise, have different thickness and the through-hole of size through every layer structural layer to make the amortization external member can both have good noise cancelling effect at bigger frequency range.

Drawings

Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a schematic block diagram of a cockpit silencing kit according to an embodiment of the present disclosure;

FIG. 2 is another schematic block diagram of a cockpit silencing kit provided in an embodiment of the present application;

FIG. 3 is yet another schematic block diagram of a cockpit silencing package according to an embodiment of the present application;

FIG. 4 is a schematic block diagram of a cockpit silencing package according to another embodiment of the present application;

FIG. 5 is another schematic block diagram of a cockpit silencing kit according to another embodiment of the present application.

Detailed Description

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It should be understood that the terms "first," "second," and the like as used in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The following further describes specific implementations of embodiments of the present application with reference to the drawings of the embodiments of the present application.

Example one

As shown in fig. 1-3, the present application provides a cockpit silencing kit, where the silencing kit 1 is installed in a box structure in a cockpit, and includes: at least three structural layers 11, 12, 13 and at least one layer of porous medium sound absorption layer 14, at least three structural layers 11, 12, 13 stack and constitute the muffler that has a plurality of expansion chamber, and every structural layer has different thickness and the through-hole of size, porous medium sound absorption layer 14 is located in the box structure.

In the box structure of amortization external member installation to cockpit in this application embodiment includes: at least three-layer structure layer and at least one deck porous medium sound absorbing layer, at least three-layer structure layer stack constitutes the muffler that has a plurality of expansion chambeies, and every layer of structure layer has different thickness and the through-hole of size, porous medium sound absorbing layer is located in the box structure. Make at least three-layer structural layer stack to constitute the muffler that has a plurality of expansion chambeies in this application embodiment, realize the amortization and fall the noise, have different thickness and the through-hole of size through every layer structural layer to make the amortization external member can both have good noise cancelling effect at bigger frequency range.

Specifically, this application embodiment can be applied to and carry out the amortization to the noise in the fixed frequency range, and fixed frequency range amortization external member generally uses in box structures such as air-conditioning box air door, blower casing, air-conditioning box casing, formulates the amortization structure of air-conditioning box air door, blower casing, air-conditioning box casing corresponding position according to the ordinary rotational speed range of air-blower rotational speed and noise spectrum characteristic.

The hiccup working process of the silencing kit in the embodiment of the application is as follows:

step 101, determining three main silencing frequencies and ranges [ omega ] of an air conditioning box and a blower box body according to the common rotating speed and the noise spectrum characteristics of the blower_i0，ω_i1]，i＝1，2，3。

And 102, determining the main body shape of the silencing external member according to the air door of the air-conditioning box, the blower shell and the box body structure of the air-conditioning box shell so as to be conveniently fixed in the air door of the air-conditioning box, the blower shell and the box body structure of the air-conditioning box shell.

103, defining the detail characteristics of the silencing structure according to the median frequency and the frequency range of the three frequency ranges, wherein the detail characteristic defining method of the silencing structure comprises the following steps:

(1) calculating corresponding median frequency omega_iAnd rate of change of frequency delta_i，

Wherein i is 1, 2, 3.

(2) Designing the size of the body shape according to the median frequency omega_iAnd rate of change of frequency delta_iStructural features of the acoustic attenuation kit are determined. The holes of the three structural layers 11, 12 and 13 shown in fig. 2 and 3 are combined together to form an expanded chamber silencer, and the central frequency ω c of the silencer is expressed as follows

Where c is the speed of sound.

The expression of the corresponding transfer loss TL is as follows

Where λ is the wavelength.

The value of n is as small as possible to ensure the central frequency omega of the silencer_cWith the median frequency omega_iApproximately, the thickness of the structural layer 11 is H1, the aperture of the through hole is L1, the thickness of the structural layer 12 is H2, the aperture of the through hole is L2, the thickness of the structural layer 13 is H3, the aperture of the through hole is L3, the thickness of the sound absorption layer of the porous medium is H4, the size of the thickness H2 of the structural layer 12 is preliminarily determined, the ratio of L2/L1 is determined according to the specific requirement of noise elimination volume, the ratio is generally 5, L1 is L3L 1 is 5mm, H1 is H2H 3, is generally defined as 2mm, and H4 is generally defined as 10mm according to the structural requirement.

(3) The initial size of the structure is the initial value of the cross-sectional size of some positions in the X and Y directions in the structure of the flat plate type silencing external member shown in figure 2, and the cross-sectional sizes of other positions are changed according to the frequency change rate delta_iDetermining, in fact, the rate of change of frequency δ_iWhich in turn affects the above-identified feature size, is a mutually iterative process. Finally, the specific size of each position is further determined according to the overall silencing effect.

Optionally, in another embodiment of the present application, the relative position of the at least three structural layers is adaptively adjusted according to a frequency range of the in-vehicle noise.

Specifically, in the embodiment of the present application, the silencing kit with the adaptive frequency range is generally applied to box structures such as glove boxes and subwoofers, and the silencing kit mainly changes the silencing frequency of the system by matching the main frequency range of the noise in the vehicle and adaptively adjusting the structure of the silencing kit or the opening and closing structure of a related cavity, so as to reduce the noise in the vehicle, and specifically includes the following implementation steps:

step 201, extracting the spectrum characteristic of noise in the automobile according to the common working conditions in the use process of the automobile, screening out the noise frequency to be silenced and the use working conditions of the whole automobile, obtaining a silencing frequency working condition table through sorting, and listing the frequency and the working conditions of the noise to be improved. As shown in table 1;

TABLE 1 frequency behavior table

[0049]	[0050]Frequency 1	[0051]Frequency 2	[0052]…	[0053]Frequency i
					[0054]Working condition 1	[0055]√	[0056]	[0057]…	[0058]
[0059]Working condition 2	[0060]	[0061]√	[0062]…	[0063]√
					[0064]…	[0065]…	[0066]…	[0067]…	[0068]…
[0069]Operating mode j	[0070]	[0071]√	[0072]…	[0073]√

Step 202, designing a glove box adaptive frequency range noise reduction suite.

Glove box adaptive frequency range amortization external member major structure the structure in the fixed frequency range amortization external member in the above-mentioned embodiment is similar, but specific structure is different, compares the difference and the characteristics of adaptive frequency range amortization external member with fixed frequency range amortization external member as follows:

the relative positions of different structural layers in the fixed frequency range silencing external member are fixed, and the relative positions of different structural layers in the self-adaptive frequency range silencing external member can be moved in a self-adaptive mode. The structure is that the thickness of the structural layer 12 in fig. 3 is H2, the thickness of the structural layer 13 is H3, the position of the structural layer in the fixed frequency range along with the X and Y directions is a variable value, the thickness of the structural layer 12 in the adaptive frequency range noise reduction kit is H2, and the thickness of the structural layer 13 is H3, so that the different layers can move relatively in the X or Y direction.

Optionally, the position of the through hole of each structural layer of the at least three structural layers.

In order to make the layers different when they are moved, the layers 11, 12, 13 are not perforated in one section.

In yet another embodiment of the present application, the relative positions of the at least three structural layers are adaptively adjusted according to the frequency range of the in-vehicle noise and the box structure.

The silencing structure of the self-adaptive frequency silencing kit is not only the structure of the self-adaptive frequency silencing kit, but also participates in silencing and noise reduction of the box structure where the self-adaptive frequency silencing kit is located.

Optionally, the porous medium sound absorption layer is positioned on the surface of the silencer with a plurality of expansion cavities formed by overlapping the at least three structural layers.

Optionally, the porous medium sound absorption layer is positioned on the surface of the inner cavity of the box body structure.

Specifically, the glove box adaptive frequency noise reduction kit is specifically designed as follows:

(1) the main form of the glove box self-adaptive frequency silencing kit is determined according to the space size of the glove box, the structure diagram of the glove box self-adaptive frequency silencing kit is shown, the sound wave transmission area of the outer plate of the glove box can enable sound waves of a cab to be smoothly transmitted to the silencing kit of a shell of the glove box, and the sound wave transmission area can be realized by directly opening a hole or replacing the sound wave transmission area with a fabric material.

(2) And designing a silencing kit according to the corresponding silencing frequency and range, as shown in a structure diagram of an adaptive silencing kit in FIG. 4:

the topological structure chart of amortization principle of glove box self-adaptation frequency amortization external member is shown as figure 5, through designing different structures on the structural layer for the structural layer is when moving, and the 1 amortization frequency of numerous little muffler changes, and the equivalent length L of sound wave transmission between cockpit and the glove box changes and makes the glove box change as the amortization frequency of helmholtz muffler.

The noise reduction frequency ranges of the glove box noise reduction kit are determined according to the space structure of the glove box and the size and the structure of the outer plates of the glove box shell [ f1, f2], [ f3, f4]. [ fn-1, fn ].

(3) And screening the silencing range of the glove box self-adaptive frequency silencing external member according to the working condition frequency information in the table 1 and the frequency range of the working condition frequency information (2), and enabling the silencing frequency of the silencing external member, the glove box cavity and the silencing external member to form a Helmholtz silencer together through structural design, wherein the silencing frequency of the Helmholtz silencer is basically consistent with the silencing frequency in the table 1.

In another embodiment of the present application, the design of the self-adaptive frequency muffling kit for the subwoofer box is to add a self-adaptive movable partition plate and a porous medium sound-absorbing layer in the box structure of the subwoofer box, change the space structure of the subwoofer box by the movement of the movable partition plate in the subwoofer box so as to change the cavity modal frequency, the subwoofer box is used as a muffler of a cockpit, the muffling frequency changes along with the change of the cavity modal frequency, the energy of the sound field in the cavity is absorbed by the porous medium sound-absorbing layer, and the change range of the cavity frequency of the subwoofer box is matched with that in table 1.

Optionally, the acoustic abatement kit further comprises: the baffle plate is arranged in the inner cavity of the box body structure, and the frequency range of the noise in the vehicle is changed by changing the space structure of the inner cavity of the box body structure.

In yet another embodiment of the present application, the cockpit silencing kit further comprises: and the Electronic Control Unit (ECU) is used for controlling the relative positions of the at least three structural layers to be adjusted according to the noise characteristic of the cockpit and the use condition of the vehicle.

In another embodiment of the present application, the electronic control unit is further configured to control the adaptive moving position of the partition plate to adjust the installation position according to the noise characteristics of the cockpit and the operating conditions of the vehicle.

In another embodiment of the present application, the electronic control unit controls the relative position of the at least three structural layers to be adjusted and controls the partition board in the adaptive moving position to be adjusted to the installation position by controlling the motor to operate the actuating mechanism.

Specifically, the ECU uses the control motor to operate the actuating mechanism according to relevant parameters of the using working conditions of the vehicle or the noise characteristics of the cockpit, so that the structural layer of the silencing external member of the glove box or the subwoofer box body is moved to a proper relative position, and the partition plate of the subwoofer box body is also moved to a proper position, so that the control mechanism enables the silencing frequency of the silencing external member of the glove box or the subwoofer to be consistent with the working condition frequency in the table 1 when the vehicle is used.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.