CN204516347U - Based on the acoustic impedance regulating device of self-adaptation micro-perforated plate sound absorber - Google Patents
Based on the acoustic impedance regulating device of self-adaptation micro-perforated plate sound absorber Download PDFInfo
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Abstract
本实用新型涉及一种基于自适应微穿孔板吸声器的声阻抗调节装置，该声阻抗调节装置包括噪声探测器、自适应控制器、压电薄膜驱动电路和压电薄膜微穿孔板吸声体。噪声探测器，探头放置于噪声环境，其输出端与自适应控制器的输入端相连；自适应控制器，其输出端与压电薄膜驱动电路的输入端相连；压电薄膜驱动电路，其输出端与压电薄膜微穿孔板吸声体的外部电极相连；压电薄膜微穿孔板吸声体为压电薄膜微穿孔板及其后覆背腔构成的吸声结构。本实用新型利用压电薄膜的逆压电效应实时调整压电薄膜微穿孔板表面振动速度，即可优化微穿孔板共振吸声结构的吸声系数，大幅扩展微穿孔板共振吸声结构的有效吸声频带，实现按需降噪。
The utility model relates to an acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber. The acoustic impedance adjustment device includes a noise detector, an adaptive controller, a piezoelectric film drive circuit and a piezoelectric film micro-perforated plate sound absorber. body. Noise detector, the probe is placed in the noise environment, its output end is connected with the input end of the adaptive controller; the adaptive controller, its output end is connected with the input end of the piezoelectric film driving circuit; the piezoelectric film driving circuit, its output The end is connected to the external electrode of the piezoelectric film micro-perforated plate sound-absorbing body; the piezoelectric film micro-perforated plate sound-absorbing body is a sound-absorbing structure composed of a piezoelectric film micro-perforated plate and a back cavity. The utility model uses the inverse piezoelectric effect of the piezoelectric film to adjust the surface vibration speed of the piezoelectric film micro-perforated plate in real time, so as to optimize the sound absorption coefficient of the resonant sound-absorbing structure of the micro-perforated plate and greatly expand the effective performance of the resonant sound-absorbing structure of the micro-perforated plate. Sound-absorbing frequency band for on-demand noise reduction.
Description
技术领域 technical field
本实用新型涉及微穿孔板吸声器技术领域，具体涉及一种基于自适应微穿孔板吸声器的声阻抗调节装置。 The utility model relates to the technical field of a micro-perforated plate sound absorber, in particular to an acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber.
背景技术 Background technique
当今社会，科学技术迅速发展，社会前进步伐加快，然而随之而来的辐射噪声也给人们生产生活的各个方面带来了大量的危害。研究和控制噪声既是保护环境的迫切需要，也是提高工业产品质量、减小能耗所必须解决的问题。 In today's society, science and technology are developing rapidly, and the pace of social progress is accelerating. However, the accompanying radiation noise has also brought a lot of harm to all aspects of people's production and life. Research and control of noise is not only an urgent need to protect the environment, but also a problem that must be solved to improve the quality of industrial products and reduce energy consumption.
噪声控制主要有三种措施，一是控制噪声源；二是在控制噪声的传播途径；三是在接受者身上采取隔离措施，减少噪声对接受者的危害。在传播途径上加以控制是一种传统有效的技术，包括吸声、隔声、隔振、阻尼减振等。其中利用吸声材料或吸声结构来吸收声能，降低噪声强度是常用的最简洁、有效的控制方法 There are three main measures for noise control, one is to control the noise source; the other is to control the transmission of noise; the third is to take isolation measures on the receiver to reduce the harm of noise to the receiver. It is a traditional and effective technology to control the transmission path, including sound absorption, sound insulation, vibration isolation, damping and vibration reduction. Among them, the use of sound-absorbing materials or sound-absorbing structures to absorb sound energy and reduce noise intensity is the most simple and effective control method commonly used.
著名的声学专家、科学院院士马大猷教授提出的微穿孔板共振吸声体是一种常用的吸声结构。微穿孔板共振吸声结构具有高频吸声性能好，不含多孔性纤维材料，不怕水和潮气，耐温防火，不霉，不蛀，清洁，无污染，可耐高温，耐腐蚀，能承受高连气流冲击，装饰效果好，经久耐用等优点。众多科学家研究并制作出各种材质、各种结构的微穿孔板共振吸声结构，解决了许多吸声降噪问题，如人民大会堂的音质问题，德国议会大厅的声学缺陷问题等。同时，在解决高噪声的特殊环境下的吸声问题上，如火箭、导弹发射时的高噪声污染，微穿孔板共振吸声结构也起到了重要的作用。现在，随着不同材料、不同结构、不同加工工艺逐渐被引入到微穿孔板的制作中，微穿孔板共振吸声结构的应用范围也得到了拓展。 The micro-perforated plate resonant sound absorber proposed by Professor Ma Dayou, a well-known acoustic expert and academician of the Academy of Sciences, is a commonly used sound-absorbing structure. The resonant sound-absorbing structure of the micro-perforated plate has good high-frequency sound-absorbing performance, does not contain porous fiber materials, is not afraid of water and moisture, is heat-resistant and fire-resistant, does not mold, does not moth, clean, pollution-free, can withstand high temperature, corrosion resistance, energy Withstand the impact of high continuous airflow, good decorative effect, durable and so on. Many scientists have researched and produced micro-perforated plate resonant sound-absorbing structures of various materials and structures, which have solved many problems of sound absorption and noise reduction, such as the sound quality of the Great Hall of the People and the acoustic defects of the German Parliament Hall. At the same time, the resonant sound-absorbing structure of the micro-perforated plate also plays an important role in solving the problem of sound absorption in special environments with high noise, such as high noise pollution when rockets and missiles are launched. Now, as different materials, different structures, and different processing techniques are gradually introduced into the production of micro-perforated panels, the application range of the resonant sound-absorbing structure of micro-perforated panels has also been expanded.
但是，普通单层微穿孔板吸声体，其穿孔直径d、穿孔率p、板厚t和空腔深度D等结构参数固定之后，根据经典的微穿孔板理论可以预测其吸声性能（最大吸声系数以及有效吸声频带）。如目前大量使用的微穿孔板吸声体孔径在0.8mm左右，穿孔率介于3%~5%之间，其频带宽度约为1~2个倍频程，有效吸声频带较窄。这表明，一旦设计好结构的各种参数，吸声体的中心频率固定且吸声频带有限。而如今，使用微穿孔板吸声体来进行吸声降噪的环境更复杂，如大型动力设备、道路等开放环境，噪声信号具有频带宽且频谱复杂的特征。在这种情况下，一个传统的微穿孔板吸声体，难以应对这些复杂的应用环境，因此迫切需要拓宽微穿孔板吸声体的有效吸声频带。目前拓宽单层微穿孔板吸声体的有效吸声频带有四种主要的方法。第一种方法是采用多层复合的微穿孔板吸声结构，每一层的结构参数（穿孔率、穿孔直径、空腔深度以及板厚）可以不同，各层综合作用的效果显著提升了微穿孔板吸声体在全频段的吸声性能。但多层复合结构明显增加了结构复杂度，也大大增加了材料和加工成本，在实际工程应用中还受到空间距离的限制。第二种方法是在单层的微穿孔板背面放置吸声材料，但增加吸声材料会带来整个结构的二次污染，发挥不了微穿孔板作为绿色环保型吸声材料的优势。第三种方法是基于压电分流阻尼技术拓展单层微穿孔板吸声体的有效吸声频带。基于分流阻尼技术的噪声控制一般是针对低频单个振动模态的，对低频吸声效果改善的频带较窄，基于多个模态的分流电路可以拓宽低频的吸收频带，但分流电路结构较为复杂。第四种方法是主被动结合的复合吸声结构。将单层微穿孔板吸声体与后覆空腔内的主动吸声控制系统相结合组成复合吸声结构，可实现宽频带的高吸声性能。但主动吸声控制系统致使整个吸声器的结构过于复杂，实际应用中更容易受到空间距离的限制。 However, after fixing structural parameters such as perforation diameter d , perforation rate p , plate thickness t and cavity depth D of ordinary single-layer micro-perforated plate sound absorbing body, its sound absorption performance can be predicted according to the classic micro-perforated plate theory (maximum sound absorption coefficient and effective sound absorption frequency band). For example, the micro-perforated plate sound-absorbing body widely used at present has an aperture of about 0.8 mm, a perforation rate of 3% to 5%, a frequency bandwidth of about 1 to 2 octaves, and a narrow effective sound absorption frequency band. This shows that once the various parameters of the structure are designed, the center frequency of the sound absorber is fixed and the sound absorption frequency band is limited. Nowadays, the environment for sound absorption and noise reduction using micro-perforated plate sound absorbers is more complicated, such as large-scale power equipment, roads and other open environments, and the noise signal has the characteristics of wide frequency band and complex spectrum. In this case, a traditional micro-perforated sound absorber is difficult to cope with these complex application environments, so it is urgent to broaden the effective sound absorption frequency band of the micro-perforated sound absorber. At present, there are four main methods to broaden the effective sound absorption frequency band of the single-layer micro-perforated plate sound absorber. The first method is to use a multi-layer composite micro-perforated plate sound-absorbing structure. The structural parameters (perforation rate, perforation diameter, cavity depth and plate thickness) of each layer can be different. The sound absorption performance of the perforated plate sound absorber in the whole frequency range. However, the multilayer composite structure obviously increases the structural complexity, and also greatly increases the cost of materials and processing, and is also limited by the spatial distance in practical engineering applications. The second method is to place sound-absorbing material on the back of the single-layer micro-perforated plate, but adding sound-absorbing material will bring secondary pollution to the entire structure, and the advantages of the micro-perforated plate as a green and environmentally friendly sound-absorbing material cannot be fully utilized. The third method is to expand the effective sound absorption frequency band of the single-layer micro-perforated plate sound absorber based on piezoelectric shunt damping technology. Noise control based on shunt damping technology is generally aimed at a single low-frequency vibration mode, and the frequency band for improving the low-frequency sound absorption effect is narrow. A shunt circuit based on multiple modes can broaden the low-frequency absorption band, but the structure of the shunt circuit is relatively complicated. The fourth method is a composite sound-absorbing structure combining active and passive. Combining the single-layer micro-perforated plate sound-absorbing body with the active sound-absorbing control system in the back cavity to form a composite sound-absorbing structure, which can achieve high sound-absorbing performance over a wide frequency band. However, the active sound absorption control system makes the structure of the entire sound absorber too complicated, and it is more likely to be limited by the space distance in practical applications.
发明内容 Contents of the invention
本实用新型的目的在于提供一种基于自适应微穿孔板吸声器的声阻抗调节装置，该调节装置及其调节方法能够根据入射噪声声波特征实时优化微穿孔板共振吸声结构吸声系数，并大幅扩展微穿孔板共振吸声结构的有效吸声频带。 The purpose of this utility model is to provide an acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber. The adjustment device and its adjustment method can optimize the sound absorption coefficient of the resonant sound-absorbing structure of the micro-perforated plate in real time according to the characteristics of the incident noise sound wave. And greatly expand the effective sound absorption frequency band of the resonant sound absorption structure of the micro-perforated plate.
为实现上述目的，本实用新型采用了以下技术方案： In order to achieve the above object, the utility model adopts the following technical solutions:
一种基于自适应微穿孔板吸声器的声阻抗调节装置，该调节装置包括噪声探测器、自适应控制器、压电薄膜驱动电路和压电薄膜微穿孔板吸声体；所述的噪声探测器，探头放置于噪声环境，其输出端与自适应控制器的输入端相连；所述的自适应控制器，其输出端与压电薄膜驱动电路的输入端相连；所述的压电薄膜驱动电路，其输出端与压电薄膜微穿孔板吸声体的外部电极相连；所述的压电薄膜微穿孔板吸声体为压电薄膜微穿孔板及其后覆背腔构成的吸声结构。 An acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber, the adjustment device includes a noise detector, an adaptive controller, a piezoelectric film drive circuit and a piezoelectric film micro-perforated plate sound absorber; the noise Detector, the probe is placed in a noise environment, its output end is connected with the input end of the adaptive controller; the adaptive controller, its output end is connected with the input end of the piezoelectric film drive circuit; the piezoelectric film The drive circuit, whose output end is connected to the external electrode of the piezoelectric film micro-perforated plate sound-absorbing body; structure.
所述的自适应控制器是基于通用可编程DSP芯片或专用DSP芯片设计的集成电路控制板。优选的，所述的自适应控制器采用的芯片为TI公司生产的TMS320系列DSP芯片。 The adaptive controller is an integrated circuit control board designed based on a general-purpose programmable DSP chip or a special-purpose DSP chip. Preferably, the chips used in the adaptive controller are TMS320 series DSP chips produced by TI.
所述的压电薄膜驱动电路包括双路直流稳压电源、信号功放电路和音频变压器；所述的双路直流稳压电源，用于为信号功放电路供电；所述的信号功放电路，其输入端与自适应控制器的输出端相连，其输出端与音频变压器的输入端相连；所述的音频变压器，其输出端与压电薄膜微穿孔板吸声体的外部电极相连。 The piezoelectric film drive circuit includes a dual-channel DC stabilized power supply, a signal amplifier circuit and an audio transformer; the dual-channel DC stabilized power supply is used to supply power to the signal amplifier circuit; the signal amplifier circuit has an input The terminal is connected with the output terminal of the adaptive controller, and the output terminal is connected with the input terminal of the audio transformer; the output terminal of the audio transformer is connected with the external electrode of the piezoelectric film micro-perforated plate sound absorbing body.
所述的信号功放电路为专用的高电压高电流运算放大器；所述的音频变压器为坡莫合金型音频升压变压器。 The signal amplifier circuit is a dedicated high-voltage and high-current operational amplifier; the audio transformer is a permalloy audio step-up transformer.
所述的压电薄膜驱动电路的输出电压为100Hz~20KHz的单频或多频的交流激励信号。 The output voltage of the piezoelectric film drive circuit is a single-frequency or multi-frequency AC excitation signal of 100Hz-20KHz.
本实用新型利用压电薄膜的逆压电效应实时调整压电薄膜微穿孔板表面振动速度，即可优化微穿孔板共振吸声结构的吸声系数，大幅扩展微穿孔板共振吸声结构的有效吸声频带，实现按需降噪。 The utility model uses the inverse piezoelectric effect of the piezoelectric film to adjust the surface vibration speed of the piezoelectric film micro-perforated plate in real time, so as to optimize the sound absorption coefficient of the resonant sound-absorbing structure of the micro-perforated plate and greatly expand the effective performance of the resonant sound-absorbing structure of the micro-perforated plate. Sound-absorbing frequency band for on-demand noise reduction.
本实用新型的有益效果为： The beneficial effects of the utility model are:
（1）与传统的多层复合微穿孔板共振吸声结构相比，本实用新型可以满足宽频段吸声降噪的需求。 (1) Compared with the traditional multi-layer composite micro-perforated plate resonant sound-absorbing structure, the utility model can meet the needs of wide-band sound absorption and noise reduction.
（2）与传统背面放置吸声材料的单层微穿孔板相比，本实用新型是基于自适应微穿孔吸声器的，并不会带来二次污染。 (2) Compared with the traditional single-layer micro-perforated plate with sound-absorbing material placed on the back, the utility model is based on an adaptive micro-perforated sound absorber, which will not cause secondary pollution.
（3）与传统外接阻尼损耗电路的微穿孔板吸声器相比，本实用新型有效吸声中心频率和带宽可以自适应调整，实现宽频范围内的吸声优化，更适合复杂环境的吸声降噪要求。 (3) Compared with the traditional micro-perforated plate sound absorber with an external damping loss circuit, the effective sound absorption center frequency and bandwidth of the utility model can be adaptively adjusted to achieve sound absorption optimization in a wide frequency range, and is more suitable for sound absorption in complex environments noise reduction requirements.
（4）与传统的主被动结合的复合吸声结构相比，本实用新型可实现主动控制模块与微穿孔板共振吸声结构的集成化，节省整个吸声装置安装时占用的空间。 (4) Compared with the traditional active-passive composite sound-absorbing structure, the utility model can realize the integration of the active control module and the resonant sound-absorbing structure of the micro-perforated plate, saving the space occupied by the entire sound-absorbing device during installation.
附图说明 Description of drawings
图1是基于自适应微穿孔板吸声器的声阻抗调节装置的结构示意图； Fig. 1 is a structural schematic diagram of an acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber;
图2是基于自适应微穿孔板吸声器的声阻抗调节装置的功能模块示意图； Fig. 2 is a functional module schematic diagram of an acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber;
图3是基于自适应微穿孔板吸声器的声阻抗调节装置在阻抗管中进行实验的原理示意图。 Fig. 3 is a schematic diagram of the principle of the experiment of the acoustic impedance adjustment device based on the adaptive micro-perforated plate sound absorber in the impedance tube.
其中： in:
1、噪声探测器，2、自适应控制器，3、压电薄膜驱动电路，4、压电薄膜微穿孔板，5、背腔，6、吸声体的外部电极，7、信号发生器，8、功率放大器，9、声源扬声器，10、阻抗管，11、B&K型号4190传声器，12、B&K型号4190传声器，13、B&K公司PULSE7700噪声与振动分析软件平台，201、信号分析模块，202、阻抗调节信号计算模块，301、双路直流稳压电源，302、信号功放电路，303、音频变压器，400、压电薄膜微穿孔板吸声体，500、噪声源。 1. Noise detector, 2. Adaptive controller, 3. Piezoelectric film driving circuit, 4. Piezoelectric film micro-perforated plate, 5. Back cavity, 6. External electrode of sound absorbing body, 7. Signal generator, 8. Power amplifier, 9. Sound source speaker, 10. Impedance tube, 11. B&K model 4190 microphone, 12. B&K model 4190 microphone, 13. PULSE7700 noise and vibration analysis software platform of B&K company, 201. Signal analysis module, 202. Impedance adjustment signal calculation module, 301, dual-channel DC regulated power supply, 302, signal power amplifier circuit, 303, audio transformer, 400, piezoelectric film micro-perforated plate sound absorbing body, 500, noise source.
具体实施方式 Detailed ways
下面结合附图对本实用新型做进一步说明，本实用新型适用于单层或多层压电薄膜微穿孔吸声器： The utility model is further described below in conjunction with the accompanying drawings. The utility model is suitable for single-layer or multi-layer piezoelectric film micro-perforated sound absorbers:
如图1所示一种基于自适应微穿孔板吸声器的声阻抗调节装置，该调节装置包括噪声探测器1、自适应控制器2、压电薄膜驱动电路3和压电薄膜微穿孔板吸声体400。所述的噪声探测器1，探头放置于噪声环境，其输出端与自适应控制器2的输入端相连；所述的自适应控制器2，其输出端与压电薄膜驱动电路3的输入端相连；所述的压电薄膜驱动电路3，其输出端与压电薄膜微穿孔板吸声体的外部电极6相连；所述的压电薄膜微穿孔板吸声体为压电薄膜微穿孔板4及其后覆背腔5构成的吸声结构。 As shown in Figure 1, an acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber, the adjustment device includes a noise detector 1, an adaptive controller 2, a piezoelectric film drive circuit 3 and a piezoelectric film micro-perforated plate Acoustic body 400 . Described noise detector 1, probe is placed in noise environment, and its output end is connected with the input end of adaptive controller 2; Described adaptive controller 2, its output end is connected with the input end of piezoelectric film driving circuit 3 connected; the piezoelectric film driving circuit 3, its output terminal is connected with the external electrode 6 of the piezoelectric film micro-perforated plate sound absorbing body; the described piezoelectric film micro-perforated plate sound-absorbing body is a piezoelectric film micro-perforated plate 4 and the sound-absorbing structure formed by the back cover cavity 5.
如图2所示的一种基于自适应微穿孔板吸声器的声阻抗调节装置，该调节装置包括噪声探测器1、自适应控制器2、压电薄膜驱动电路3和压电薄膜微穿孔板吸声体400。所述的自适应控制器2包括信号分析模块201和阻抗调节信号计算模块202。所述的压电薄膜驱动电路3包括双路直流稳压电源301、信号功放电路302和音频变压器303。所述的双路直流稳压电源301，用于为信号功放电路302供电。所述的压电薄膜微穿孔板吸声体400为外设电极引线的压电薄膜微穿孔板及后覆刚性背腔。 As shown in Figure 2, an acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber, the adjustment device includes a noise detector 1, an adaptive controller 2, a piezoelectric film drive circuit 3 and a piezoelectric film micro-perforated Panel sound absorber 400 . The adaptive controller 2 includes a signal analysis module 201 and an impedance adjustment signal calculation module 202 . The piezoelectric film driving circuit 3 includes a dual-channel DC stabilized power supply 301 , a signal amplifier circuit 302 and an audio transformer 303 . The dual-channel DC stabilized power supply 301 is used to supply power to the signal power amplifier circuit 302 . The piezoelectric film micro-perforated plate sound absorber 400 is a piezoelectric film micro-perforated plate with external electrode leads and a back-covered rigid back cavity.
如图3所示，信号发生器7、功率放大器8、声源扬声器9、阻抗管10、B&K型号4190传声器11、B&K型号4190传声器12以及B&K公司 PULSE7700噪声与振动分析软件平台13共同构成了传递函数法测量吸声系数的装置。在阻抗管10中，压电薄膜微穿孔板正面暴露在垂直入射的声波下，背面为一空气腔；同时，压电薄膜微穿孔板通过电路引线端与外部的压电薄膜驱动器3进行连接，用于驱动压电薄膜微穿孔板产生振动；压电薄膜驱动电路3与自适应控制器2相连，由自适应控制器2发出相应的控制信号，控制压电薄膜驱动电路3输出合适大小的电压；自适应控制器2又与噪声探测器1相连，噪声探测器1正面暴露在垂直入射的声波下，用于探测入射噪声信号，并传输给自适应控制器3进行运算，分析探测噪声并产生相应的控制信号；噪声探测器1、自适应控制器2、压电薄膜驱动电路3和压电薄膜微穿孔板吸声体400共同构成了自适应微穿孔吸声器。 As shown in Fig. 3, signal generator 7, power amplifier 8, sound source speaker 9, impedance tube 10, B&K model 4190 microphone 11, B&K model 4190 microphone 12, and B&K company PULSE7700 noise and vibration analysis software platform 13 together constitute the transmission A device for measuring the sound absorption coefficient by the function method. In the impedance tube 10, the front of the piezoelectric film micro-perforated plate is exposed to vertically incident sound waves, and the back is an air cavity; at the same time, the piezoelectric film micro-perforated plate is connected to the external piezoelectric film driver 3 through the circuit lead end, Used to drive the piezoelectric film micro-perforated plate to generate vibration; the piezoelectric film drive circuit 3 is connected to the adaptive controller 2, and the adaptive controller 2 sends a corresponding control signal to control the piezoelectric film drive circuit 3 to output a suitable voltage The adaptive controller 2 is connected with the noise detector 1 again, and the noise detector 1 is exposed to vertically incident sound waves on the front side, and is used to detect the incident noise signal, and transmits it to the adaptive controller 3 for calculation, analyzes the detection noise and generates Corresponding control signals; the noise detector 1 , the adaptive controller 2 , the piezoelectric film drive circuit 3 and the piezoelectric film micro-perforated sound absorber 400 together constitute an adaptive micro-perforated sound absorber.
声阻抗调节及结构吸声性能检测实验的工作过程和原理为：信号发生器7产生噪声信号，经Classic牌型号4.0B的功率放大器8后传递至动圈式声源扬声器9，声源扬声器9在阻抗管10中输出噪声信号；噪声在阻抗管10中近似以平面波的形式传播，并垂直入射到压电薄膜微穿孔板共振吸声结构400的表面；同时噪声探测器1探测入射噪声信号，并传递给自适应控制器2；自适应控制器2综合输入信息，产生控制信号，控制压电薄膜驱动器3输出相应的电压来驱动压电薄膜微穿孔板共振吸声结构400中的主动控制执行器件——压电薄膜微穿孔板；基于逆压电效应，压电薄膜产生振动，进而可以改变表面辐射阻抗大小，调节压电薄膜微穿孔板共振吸声结构400的吸声系数；靠近压电薄膜微穿孔板共振吸声结构400表面的两个传声器11（12）同时将各自检测的声压信号传递到B&K PULSE7700系统，利用传递函数法计算压电薄膜微穿孔板共振吸声结构400的吸声系数，用于反馈微调理论计算得到驱动电压。 The working process and principle of the acoustic impedance adjustment and structural sound absorption performance testing experiment are as follows: the signal generator 7 generates a noise signal, which is transmitted to the moving coil sound source speaker 9 through the Classic brand model 4.0B power amplifier 8, and the sound source speaker 9 The noise signal is output in the impedance tube 10; the noise propagates approximately in the form of a plane wave in the impedance tube 10, and is vertically incident on the surface of the piezoelectric film micro-perforated plate resonant sound-absorbing structure 400; while the noise detector 1 detects the incident noise signal, And pass it to the adaptive controller 2; the adaptive controller 2 synthesizes the input information, generates a control signal, and controls the piezoelectric film driver 3 to output a corresponding voltage to drive the active control execution in the piezoelectric film micro-perforated plate resonant sound-absorbing structure 400 Device—a piezoelectric film micro-perforated plate; based on the inverse piezoelectric effect, the piezoelectric film vibrates, which in turn can change the surface radiation impedance and adjust the sound absorption coefficient of the piezoelectric film micro-perforated plate resonant sound-absorbing structure 400; close to the piezoelectric The two microphones 11 (12) on the surface of the film micro-perforated plate resonant sound-absorbing structure 400 simultaneously transmit the sound pressure signals detected by them to the B&K PULSE7700 system, and use the transfer function method to calculate the piezoelectric film micro-perforated plate resonant sound-absorbing structure 400 Acoustic coefficient, used for feedback fine-tuning theoretical calculation to obtain the driving voltage.
以上所述的实施例仅仅是对本实用新型的优选实施方式进行描述，并非对本实用新型的范围进行限定，在不脱离本发明设计精神的前提下，本领域普通技术人员对本发明的技术方案作出的各种变形和改进，均应落入本发明权利要求书确定的保护范围内。 The embodiments described above are only descriptions of preferred implementations of the present utility model, and are not intended to limit the scope of the present utility model. Under the premise of not departing from the design spirit of the present invention, technical solutions of the present invention are made by those of ordinary skill in the art. Various modifications and improvements should fall within the scope of protection determined by the claims of the present invention.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107316632A (en) * | 2017-06-14 | 2017-11-03 | 中国农业大学 | A kind of sound absorber and sound absorption method |
| CN108430016A (en) * | 2018-04-06 | 2018-08-21 | 西北工业大学 | A closed-cavity PVDF film loudspeaker |
| CN112365872A (en) * | 2020-11-10 | 2021-02-12 | 国网北京市电力公司 | Noise reduction regulation and control method, device and system and processor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107316632A (en) * | 2017-06-14 | 2017-11-03 | 中国农业大学 | A kind of sound absorber and sound absorption method |
| CN108430016A (en) * | 2018-04-06 | 2018-08-21 | 西北工业大学 | A closed-cavity PVDF film loudspeaker |
| CN108430016B (en) * | 2018-04-06 | 2020-04-03 | 西北工业大学 | Closed cavity type PVDF film loudspeaker |
| CN112365872A (en) * | 2020-11-10 | 2021-02-12 | 国网北京市电力公司 | Noise reduction regulation and control method, device and system and processor |
| CN112365872B (en) * | 2020-11-10 | 2024-05-28 | 国网北京市电力公司 | Noise reduction regulation method, device and system and processor |
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