CN104681021A - Magnetic-field-adjustable low-frequency sound insulation structure and sound insulation material - Google Patents
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Abstract
一种磁场可调控低频隔声结构，包括：四周封闭、且中部具有通孔的基体、嵌入在该基体的通孔内的磁性质子、以及附着在所述的基体与磁性质子缝隙之间的软性材料，该软性材料分别与所述的基体、磁性质子固定连接。当外扰声波入射到该本发明表面时会激起相应的振动，通过频谱分析会发现共振峰和反共振峰，反共振峰的位置附近即为隔声效果较好的频段。外界磁场可以控制该结构单元中的磁性材料和软质材料的受力情况，从而移动反共振峰的位置。在材料弹性范围内，所加磁场越大，隔声量峰值的移动便越大，故而可根据外界噪声的频率分布及变化情况，通过调控外加磁场大小，使得材料隔声量峰值移动到与外界噪声频率吻合处，实现非常好的主动隔声效果。
A low-frequency sound insulation structure that can be regulated by a magnetic field, comprising: a matrix with closed surroundings and a through hole in the middle, magnetic protons embedded in the through holes of the matrix, and soft soft soft material, the soft material is fixedly connected with the matrix and the magnetic proton respectively. When external disturbance sound waves are incident on the surface of the present invention, corresponding vibrations will be aroused, and resonance peaks and anti-resonance peaks will be found through spectrum analysis, and the vicinity of the anti-resonance peak is the frequency band with better sound insulation effect. The external magnetic field can control the stress of the magnetic material and soft material in the structural unit, thereby moving the position of the anti-resonant peak. Within the elastic range of the material, the greater the applied magnetic field, the greater the movement of the peak value of the sound insulation. Therefore, according to the frequency distribution and changes of the external noise, by adjusting the magnitude of the external magnetic field, the peak value of the material's sound insulation can be moved to the frequency of the external noise. The anastomosis achieves a very good active sound insulation effect.
Description
技术领域technical field
本发明涉及低频隔声材料技术领域，具体是一种磁场可调控低频隔声结构及隔声材料。The invention relates to the technical field of low-frequency sound-insulating materials, in particular to a low-frequency sound-insulating structure and a sound-insulating material that can be regulated by a magnetic field.
背景技术Background technique
通过插入材料来阻隔噪声的传播路径或者吸收消耗噪声的能量，使通过材料后的声能量减小的方法，叫做隔声。通常用隔声量来描述材料本身固有的隔声能力，其定义为：噪声通过材料前后的声能量比，即入射声能与透视声能之比取对数得到的分贝数，又称为传递损失，常用符号R或者TL(dB)表示。The method of inserting materials to block the propagation path of noise or absorb and consume the energy of noise to reduce the sound energy after passing through the material is called sound insulation. The inherent sound insulation ability of the material itself is usually described by the sound insulation capacity, which is defined as: the sound energy ratio before and after the noise passes through the material, that is, the decibel number obtained by taking the logarithm of the ratio of the incident sound energy to the perspective sound energy, also known as the transmission loss , commonly used symbols R or TL (dB) said.
改革开放以来，我国的工业化进程高速发展，在带来了高经济效益的同时造成了严重的噪声污染，其中低频噪声对人体的危害最为严重。主要损伤人体的听觉系统以及神经系统。低频噪声的来源主要包括电梯，变压器，中央空调以及交通噪声。根据经典的质量定理，对于传统隔声材料高频域的隔声可以达到很好的效果，但对于低频声波的衰减效果较差，能量衰减缓慢，穿透力强，传播距离远，导致对于低频声波的隔声降噪成为一个尚未解决的棘手的工程难题。Since the reform and opening up, my country's industrialization process has developed rapidly, which has brought high economic benefits and caused serious noise pollution, among which low-frequency noise is the most harmful to the human body. It mainly damages the auditory system and nervous system of the human body. Sources of low-frequency noise mainly include elevators, transformers, central air conditioners, and traffic noise. According to the classic mass theorem, traditional sound insulation materials can achieve good sound insulation effects in the high-frequency domain, but the attenuation effect on low-frequency sound waves is poor, the energy attenuation is slow, the penetration is strong, and the propagation distance is long, resulting in low-frequency sound waves. The sound insulation and noise reduction of sound waves has become an unresolved thorny engineering problem.
2000年的Science期刊上，刘正猷等人首次提出了局域共振型声子晶体的概念。文中提出用硅胶包覆铅球按照简单立方晶格排列在环氧树脂基体中，理论和实验都证明了这一结构具有400Hz左右的低频带隙，比相同尺寸的Bragg散射型声子晶体的第一带隙频率降低了两个数量级。这一发现实现了小尺寸控制大波长，对解决低频振动噪声问题提供了新的思路。In the journal Science in 2000, Liu Zhengyou and others first proposed the concept of local resonance phononic crystals. In this paper, it is proposed that lead balls coated with silica gel are arranged in an epoxy resin matrix according to a simple cubic lattice. Both theory and experiments have proved that this structure has a low-frequency band gap of about 400 Hz, which is better than that of the first Bragg scattering phononic crystal of the same size. The bandgap frequency is reduced by two orders of magnitude. This discovery realizes the control of large wavelength in a small size, and provides a new idea for solving the problem of low-frequency vibration and noise.
根据安培定理，通电导线周围会产生磁场，实验中经常使用通电线圈产生具有梯度的非匀强磁场，非匀强磁场作用在磁性质量单元上会产生一个力，这个力会改变磁性质量单元的位置和软性材料的受张力情况，从而改变整个弹性体的等效刚度，进而影响磁性质量单元的振动情况以及低频域的隔声峰值频率范围。According to Ampere's theorem, a magnetic field will be generated around the energized wire. In the experiment, a energized coil is often used to generate a non-uniform magnetic field with a gradient. The non-uniform magnetic field acts on the magnetic mass unit to generate a force, which will change the position of the magnetic mass unit. And the tension of the soft material, thereby changing the equivalent stiffness of the entire elastic body, and then affecting the vibration of the magnetic mass unit and the peak frequency range of sound insulation in the low frequency domain.
磁性材料按照磁化后去磁的难易程度，可分为软磁性材料和硬磁性材料。硬磁材料是指磁化后不易退磁而能长期保留磁性的一种材料。常用的永磁材料有稀土永磁材料、金属永磁材料、铁氧体永磁材料。Magnetic materials can be divided into soft magnetic materials and hard magnetic materials according to the difficulty of demagnetization after magnetization. Hard magnetic material refers to a material that is not easy to demagnetize after magnetization and can retain magnetism for a long time. Commonly used permanent magnet materials include rare earth permanent magnet materials, metal permanent magnet materials, and ferrite permanent magnet materials.
现有的低频隔声超材料，其物理特性一经定型便无法更改，均只能对低频声波的某一频段进行有效隔绝，难以适用于复杂多变的外界噪声。The existing low-frequency sound-isolating metamaterials cannot be changed once their physical properties are finalized, and they can only effectively isolate a certain frequency band of low-frequency sound waves, which is difficult to apply to complex and changeable external noises.
发明内容Contents of the invention
本发明的目的在克服上述现有技术的不足，提供一种磁场可调控低频隔声结构及隔声材料，可以人为隔离某一任意低频段的噪声影响，即能够选择性地主动对低频噪音进行衰减，高效且易于实现。The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and to provide a magnetic field adjustable low-frequency sound insulation structure and sound insulation material, which can artificially isolate the noise influence of any low-frequency band, that is, can selectively and actively conduct low-frequency noise attenuation, efficient and easy to implement.
为了解决上述问题，本发明的技术解决方案如下：In order to solve the above problems, the technical solution of the present invention is as follows:
一种磁场可调控低频隔声结构，其特点在于，包括：四周封闭、且中部具有通孔的基体、嵌入在该基体的通孔内的磁性质子、以及附着在所述的基体与磁性质子缝隙之间的软性材料，该软性材料分别与所述的基体、磁性质子固定连接。A magnetic field adjustable low-frequency sound insulation structure, which is characterized in that it includes: a matrix with closed surroundings and a through hole in the middle, a magnetic proton embedded in the through hole of the matrix, and a gap between the matrix and the magnetic proton The soft material between them is fixedly connected with the matrix and the magnetic proton respectively.
所述的基体是由杨氏模量大于1Gpa的硬质材料制成。The base body is made of hard material with Young's modulus greater than 1Gpa.
所述的软性材料层是由杨氏模量小于1Gpa的软性材料制成。The soft material layer is made of soft material with Young's modulus less than 1Gpa.
所述的软性材料是硅橡胶或丁苯橡胶。The soft material is silicon rubber or styrene-butadiene rubber.
所述的磁性质子是由硬磁材料或软磁材料制成。The magnetic proton is made of hard magnetic material or soft magnetic material.
所述的基体与软性材料层的厚度一致，且在1mm-10mm之间。The base body and the soft material layer have the same thickness, which is between 1mm and 10mm.
所述的磁性质子的半径不超过10mm。The radius of the magnetic proton is not more than 10mm.
一种磁场可调控低频隔声材料，由一个或多个上述的磁场可调控低频隔声结构周期性排列组成。A magnetic field-adjustable low-frequency sound insulation material is composed of one or more of the above-mentioned magnetic field-adjustable low-frequency sound insulation structures arranged periodically.
外部磁场由通电线圈或永磁体产生，可以通过改变线圈的空间结构，通电电流大小方向或者永磁体的位置来改变磁场的梯度。通过调节外界磁场的梯度大小，可以改变弹性体的等效弹性系数，从而改变了本发明的共振频率，进而改变反共振即高隔声量处的峰值频率。The external magnetic field is generated by a energized coil or a permanent magnet, and the gradient of the magnetic field can be changed by changing the spatial structure of the coil, the magnitude and direction of the energized current, or the position of the permanent magnet. By adjusting the gradient of the external magnetic field, the equivalent elastic coefficient of the elastic body can be changed, thereby changing the resonance frequency of the present invention, and further changing the anti-resonance, that is, the peak frequency at high sound insulation.
与现有技术相比，本发明有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
1)能够选择性地对低频噪音进行主动衰减，方便地通过调整外加磁场大小或永磁体的位置，改变高隔声量的频段。1) It can selectively actively attenuate low-frequency noise, and easily change the frequency band with high sound insulation by adjusting the size of the external magnetic field or the position of the permanent magnet.
2)通过调节磁性材料的重量与磁化强度，可以调节隔声量峰值频段移动的效率。2) By adjusting the weight and magnetization of the magnetic material, the efficiency of the movement of the peak frequency band of the sound insulation can be adjusted.
3)结构设计简单，易于批量化加工和制造。3) The structural design is simple, and it is easy to process and manufacture in batches.
附图说明Description of drawings
图1是本发明磁场可调控低频隔声结构的示意图。Fig. 1 is a schematic diagram of a low-frequency sound insulation structure adjustable by a magnetic field according to the present invention.
图2是外加磁场强度B的方向平行于永磁体所受的力F的方向时的示意图。Fig. 2 is a schematic diagram when the direction of the applied magnetic field intensity B is parallel to the direction of the force F experienced by the permanent magnet.
图3是图2的等效物理模型。FIG. 3 is an equivalent physical model of FIG. 2 .
图4是不同磁场大小时的样品隔声量曲线频谱图。Fig. 4 is the spectrum diagram of the sound insulation curve of the sample at different magnetic field sizes.
图5是麦克风驻波管法测试装置示意图。Fig. 5 is a schematic diagram of the testing device for the microphone standing wave tube method.
具体实施方式Detailed ways
为使本发明的目的和技术方案更加清楚明白，以下结合实施例并参照附图，对本发明进行详细的说明。In order to make the purpose and technical solution of the present invention clearer, the present invention will be described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.
参照图1，图1是本发明磁场可调控低频隔声结构的示意图，如图所示，一种磁场可调控低频隔声结构，包括：四周封闭、且中部具有通孔的基体1、嵌入在该基体的通孔内的磁性质子3、以及附着在所述的基体与磁性质子3缝隙之间的软性材料2，该软性材料2分别与所述的基体、磁性质子固定连接。Referring to Fig. 1, Fig. 1 is a schematic diagram of a low-frequency sound insulation structure adjustable by a magnetic field according to the present invention. As shown in the figure, a low-frequency sound insulation structure adjustable by a magnetic field includes: a matrix 1 with a closed surrounding and a through hole in the middle, embedded in The magnetic protons 3 in the through holes of the substrate, and the soft material 2 attached between the substrate and the magnetic protons 3, the soft material 2 is fixedly connected with the substrate and the magnetic protons respectively.
由杨氏模量大于1Gpa的硬质材料作为基体，且固定连接于外界设备上或框架上。所谓杨氏模量，是表征材料弹性系数的参数。本发明中所写的固定连接的含义就是这种连接方式能保证两种材料之间不会发生相对运动，包括用胶水或者螺钉固定等。基体的厚度在1mm-10mm之间。The hard material with Young's modulus greater than 1Gpa is used as the substrate, and it is fixedly connected to the external equipment or frame. The so-called Young's modulus is a parameter that characterizes the elastic coefficient of a material. The meaning of the fixed connection written in the present invention is that this connection method can ensure that there will be no relative movement between the two materials, including fixing with glue or screws. The thickness of the matrix is between 1mm-10mm.
杨氏模量小于100Mpa的材料可用作填充的软质材料，可以是实心的也可以是孔状的，软质材料包括但不限于丁苯橡胶和硅橡胶等，硬质材料和软质材料接触部分采用固定连接。软质材料的厚度与硬质材料一致。Materials with Young's modulus less than 100Mpa can be used as soft materials for filling, which can be solid or porous. Soft materials include but not limited to styrene-butadiene rubber and silicone rubber, etc., hard materials and soft materials The contact part adopts fixed connection. The soft material has the same thickness as the hard material.
嵌入在软质材料中的磁性质子选用磁性材料，包括硬磁材料和软磁材料。磁性质子的形状可以是但不限于圆柱形，球形，正方形等。磁性质子和软质材料固定连接，包括用胶水连接以及制备的时候直接将磁质子固化于软质材料中。磁性质子的厚度或者直径在0.1mm-10mm之间。软质材料中嵌入的磁性质子数量不限。Magnetic protons embedded in soft materials are selected from magnetic materials, including hard magnetic materials and soft magnetic materials. The shape of the magnetic proton can be but not limited to cylindrical, spherical, square, etc. The fixed connection between the magnetic proton and the soft material includes connecting with glue and directly solidifying the magnetic proton in the soft material during preparation. The thickness or diameter of the magnetic proton is between 0.1mm-10mm. There is no limit to the number of magnetic protons embedded in soft materials.
一种磁场可调控低频隔声材料，由一个或多个上述的磁场可调控低频隔声结构周期性排列组成。A magnetic field-adjustable low-frequency sound insulation material is composed of one or more of the above-mentioned magnetic field-adjustable low-frequency sound insulation structures arranged periodically.
本发明的制备方法如下：The preparation method of the present invention is as follows:
①将杨氏模量大于1Gpa的较硬的材料的薄板，采取钻孔或铣等方式成型成带有通孔的基体。用丙酮溶液清洗基体与磁性质子表面，从而能与硅胶粘连牢固。① A thin plate of a harder material with a Young's modulus greater than 1Gpa is formed into a matrix with through holes by drilling or milling. Wash the substrate and the surface of the magnetic proton with acetone solution, so that it can be firmly adhered to the silica gel.
②在基体以及磁性质子表面涂抹一层助粘剂，在通风环境中静止十五分钟，待其干燥。②Apply a layer of adhesion promoter on the substrate and the surface of the magnetic proton, and let it stand in a ventilated environment for fifteen minutes, and wait for it to dry.
③在基体的下方放置一块具有较弱磁性的软橡胶磁板，以便于后续放入通孔中的磁性质子固定位置。磁性质子的极性排列可以任意排列。③ A soft rubber magnetic plate with weak magnetism is placed under the substrate to facilitate the fixed position of the magnetic protons that are subsequently placed in the through holes. The polarity arrangement of the magnetic protons can be arranged arbitrarily.
④配置液态硅胶并浇入，让液态硅胶充满磁性质子与基体间空隙。④Configure liquid silica gel and pour it in, so that the liquid silica gel fills the gap between the magnetic protons and the substrate.
⑤将结构放入真空恒温箱中，抽多次真空，将硅胶中的汽泡完全排出。将真空恒温箱置温度50度，加热600分钟，以使硅胶凝固。⑤Put the structure in a vacuum incubator and pump the vacuum several times to completely discharge the bubbles in the silica gel. Set the temperature of the vacuum incubator at 50°C and heat for 600 minutes to solidify the silica gel.
⑤取出并清理表面多余的硅胶，移去软橡胶磁板，制备完毕。⑤Take out and clean the excess silica gel on the surface, remove the soft rubber magnetic plate, and the preparation is complete.
图2是外加磁场强度B的方向平行于永磁体所受的力f的方向时的示意图，图3是图2的等效物理模型，即所述隔声材料对应的弹簧质量系统中一个负质量单元的力学模型示意图，其中f为声波传播过程中单元所受的力，k为软质材料的弹性系数，d为磁性材料对应外圈硬质材料的位移，M为磁性材料的质量。当磁场方向和磁铁受外界磁场作用力方向一致时，根据牛顿第二定律可得f-kd-fmag＝-Mw2d，根据等效质量的定义，Ftot＝-Meffw2d，联立这两个公式可得Meff＝M(1-wc 2/w2)，其中共振频率由麦克斯韦方程可得，磁场力fmag＝Mu0E▽H,其中，μ0为真空磁导率，H为磁场强度，▽H即为磁场强度的梯度，E是磁性材料的磁化强度。因此，即通过调节外界磁场的梯度大小，可以改变了弹性体的等效弹性系数，从而改变了共振频率，从而也会改变反共振即高隔声量处的峰值频率。通电线圈或永磁体产生的磁场易于调控，而且具有非接触等优点。所加的外界磁场方向可以但不限于与磁性质子的方向平行或者相反。通过外加磁场改变磁性质子和软质材料的受力振动模式，从而调控材料隔声峰值对应的频率位置，达到高效便捷的主动隔声目的。Fig. 2 is a schematic diagram when the direction of the applied magnetic field intensity B is parallel to the direction of the force f suffered by the permanent magnet, and Fig. 3 is the equivalent physical model of Fig. 2, that is, a negative mass in the spring mass system corresponding to the sound insulation material Schematic diagram of the mechanical model of the unit, where f is the force on the unit during the sound wave propagation, k is the elastic coefficient of the soft material, d is the displacement of the magnetic material corresponding to the hard material of the outer ring, and M is the mass of the magnetic material. When the direction of the magnetic field is consistent with the force direction of the magnet by the external magnetic field, according to Newton's second law, f-kd-f mag = -Mw 2 d, according to the definition of equivalent mass, F tot = -M eff w 2 d, Combining these two formulas, M eff = M(1-w c 2 /w 2 ), where the resonance frequency From Maxwell's equations, the magnetic field force f mag = Mu 0 E▽H, where μ0 is the vacuum permeability, H is the magnetic field strength, ▽H is the gradient of the magnetic field strength, and E is the magnetization of the magnetic material. therefore, That is, by adjusting the gradient of the external magnetic field, the equivalent elastic coefficient of the elastic body can be changed, thereby changing the resonance frequency, and thus also changing the anti-resonance, that is, the peak frequency at high sound insulation. The magnetic field generated by energized coils or permanent magnets is easy to control and has the advantages of non-contact. The direction of the applied external magnetic field can be, but not limited to, parallel to or opposite to the direction of the magnetic protons. The force vibration mode of magnetic protons and soft materials is changed by an external magnetic field, thereby adjusting the frequency position corresponding to the peak value of the sound insulation of the material, and achieving the purpose of active sound insulation efficiently and conveniently.
图5是麦克风驻波管法测试装置示意图，图中，S1为1号麦克风与2号麦克风之间的距离，S2为3号麦克风与4号麦克风之间的距离，d1和d2分别为样品前表面到第二个和第三个麦克风之间的距离，A代表声源入射到样品表面的声信号，B代表样品表面反射的声信号，C代表进过样品之后透射的声信号，D代表驻波管末端反射回来的微弱声信号。基于ASTM(American Societyfor Testing and Materials，美国材料与测试协会)的E2611-09：“Standard testmethod for measurement of normal incidence sound transmission of acousticalmaterials based on the transfer matrix method”的采用四麦克风驻波管法对材料的隔声量测试标准进行测试，即可得到材料的在各个频率处的隔声量大小。Figure 5 is a schematic diagram of the microphone standing wave tube method test device, in the figure, S 1 is the distance between No. 1 microphone and No. 2 microphone, S 2 is the distance between No. 3 microphone and No. 4 microphone, d 1 and d 2 are the distances from the front surface of the sample to the second and third microphones, A represents the acoustic signal incident on the sample surface from the sound source, B represents the acoustic signal reflected from the sample surface, and C represents the transmitted acoustic signal after entering the sample , D represents the weak acoustic signal reflected back from the end of the standing wave tube. Based on ASTM (American Society for Testing and Materials, American Society for Testing and Materials) E2611-09: "Standard testmethod for measurement of normal incidence sound transmission of acousticalmaterials based on the transfer matrix method", the four-microphone standing wave tube method is used to test the material According to the sound insulation test standard, the sound insulation of the material at each frequency can be obtained.
实施效果：利用软件对磁场调控隔声量的频率范围进行了调控测试，磁性质子为圆柱形，底面直径4厘米，厚度1.875厘米，密度为7克每立方厘米，体积为23.55立方厘米。软质材料采用硅胶薄膜，密度为1.3克每立方厘米，厚度也为1.875厘米，硬质材料采用铝，密度为2.7克每立方厘米。我们利用通电线圈产生不同梯度大小的磁场，并作用于样品上面，利用测试系统得到低频隔声量曲线，如图4所示。从图中可以看出，外加磁场的确能调控隔声量峰值频率的大小，粗实直线表示外加磁场在质子上产生的等效力为0N时的低频隔声量曲线图，虚线表示外加磁场在质子上产生的等效力为1.1775mN时的低频隔声量曲线图，点横虚线表示外加磁场在质子上产生的等效力为4.170mN时的低频隔声量曲线图，细实直线表示外加磁场在质子上产生的等效力为8.340mN时的低频隔声量曲线图。比较各条曲线可得，当外加磁场的梯度越大的时候，隔声量的峰值频率移动也越大。当外扰声波入射到该本发明表面时会激起相应的振动，通过频谱分析会发现共振峰和反共振峰，反共振峰的位置附近即为隔声效果较好的频段。外界磁场可以控制该结构单元中的磁性材料和软质材料的受力情况，从而移动反共振峰的位置。在材料弹性范围内，所加磁场越大，隔声量峰值的移动便越大，故而可根据外界噪声的频率分布及变化情况，通过调控外加磁场大小，使得材料隔声量峰值移动到与外界噪声频率吻合处，实现非常好的主动隔声效果。Implementation effect: The software is used to control the frequency range of the magnetic field to control the sound insulation. The magnetic proton is cylindrical, with a bottom diameter of 4 cm, a thickness of 1.875 cm, a density of 7 grams per cubic centimeter, and a volume of 23.55 cubic centimeters. The soft material is made of silicone film with a density of 1.3 grams per cubic centimeter and a thickness of 1.875 centimeters. The hard material is made of aluminum with a density of 2.7 grams per cubic centimeter. We use energized coils to generate magnetic fields with different gradient sizes, and act on the sample, and use the test system to obtain the low-frequency sound insulation curve, as shown in Figure 4. It can be seen from the figure that the external magnetic field can indeed control the peak frequency of the sound insulation. The thick solid straight line represents the low-frequency sound insulation curve when the equivalent force generated by the external magnetic field on the proton is 0N, and the dotted line represents the generation of the external magnetic field on the proton. The low-frequency sound insulation curve when the equivalent force is 1.1775mN, the dotted horizontal dotted line represents the low-frequency sound insulation curve when the equivalent force of the external magnetic field on the proton is 4.170mN, and the thin solid line represents the equivalent force generated by the external magnetic field on the proton Low-frequency sound insulation curve when the efficacy is 8.340mN. Comparing the curves, it can be seen that when the gradient of the applied magnetic field is larger, the peak frequency shift of the sound insulation is also larger. When external disturbance sound waves are incident on the surface of the present invention, corresponding vibrations will be aroused, and resonance peaks and anti-resonance peaks will be found through spectrum analysis, and the vicinity of the anti-resonance peak is the frequency band with better sound insulation effect. The external magnetic field can control the stress of the magnetic material and soft material in the structural unit, thereby moving the position of the anti-resonant peak. Within the elastic range of the material, the greater the applied magnetic field, the greater the movement of the peak value of the sound insulation. Therefore, according to the frequency distribution and changes of the external noise, by adjusting the magnitude of the external magnetic field, the peak value of the material's sound insulation can be moved to the frequency of the external noise. The anastomosis achieves a very good active sound insulation effect.
以上所述，仅为本发明的优选实施例而已，当不能以此限定本发明实施的范围，即大凡依本发明权利要求及发明说明书内容所做的简单的等效变化与修饰，皆应仍属本发明专利覆盖的范围内。The above is only a preferred embodiment of the present invention, and should not limit the scope of the present invention, that is, all simple equivalent changes and modifications made according to the claims of the present invention and the content of the description of the invention should still be It belongs to the scope covered by the patent of the present invention.
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| CN106678271A (en) * | 2016-12-08 | 2017-05-17 | 西北工业大学 | Local resonance low-frequency band gap vibration suppression periodic structure |
| CN107274880A (en) * | 2017-07-04 | 2017-10-20 | 北京市劳动保护科学研究所 | A kind of non-linear magnetic force negative stiffness Active Absorption device |
| CN108447467A (en) * | 2018-03-30 | 2018-08-24 | 重庆速阔智能科技有限公司 | A kind of active acoustical metamaterial structure unit and its control device |
| CN109493840A (en) * | 2018-12-06 | 2019-03-19 | 南京航空航天大学 | Adjustable double-layer thin web acoustic metamaterial structure based on the effect of permanent magnet repulsion |
| CN109505904A (en) * | 2018-12-27 | 2019-03-22 | 长沙理工大学 | A kind of low frequency vibration damping Meta Materials |
| CN110501419A (en) * | 2019-07-18 | 2019-11-26 | 江苏大学 | An acoustic measurement system with an axially adjustable uniform magnetic field loading device |
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| CN112259066A (en) * | 2020-10-23 | 2021-01-22 | 西安交通大学 | An N-Order Acoustic Metamaterial Low-Frequency Sound Insulation Structure |
| CN112878219A (en) * | 2021-01-14 | 2021-06-01 | 西南大学 | Phononic crystal sound barrier with self-adaptive function |
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| CN112259066A (en) * | 2020-10-23 | 2021-01-22 | 西安交通大学 | An N-Order Acoustic Metamaterial Low-Frequency Sound Insulation Structure |
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