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Compact asymmetric sound absorber at the exceptional point

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Science China(Physics,Mechanics & Astronomy) 2021年第4期64卷 10-16页

作者： DongTing Li sibo huang Yi Cheng Yong Li Institute of Acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092China

We present an asymmetric absorber at an exceptional point(EP) with a compact configuration and deep-subwavelength *** conventional side-branched sound absorbers in dual-port systems, the proposed asymmetric absorber exhibits a compact shape that is coaxial with the waveguide. By tuning the loss and geometric parameters of the non-Hermitian system to reach an EP, we observe extreme asymmetric absorption. This phenomenon is theoretically and experimentally validated by observing a quasi-perfect absorption and a near-total reflection for opposite incidences at the ultra-thin(1/28 th of the operating wavelength)neck-embedded tube employed in this study. Furthermore, we demonstrate an EP-induced tunable asymmetric absorption. Our study proposes novel approaches to manipulate the EP-induced wave phenomena, paving the way for the development of novel acoustic absorbers, sensors, isolators, and directional devices.

关键词： asymmetric sound absorber acoustic metamaterial non-Hermitian system exceptional point

Broadband impedance modulation via non-local acoustic metamaterials

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National Science Review 2022年第8期9卷 47-54页

作者： Zhiling Zhou sibo huang Dongting Li Jie Zhu Yong Li Institute of Acoustics School of Physics Science and EngineeringTongji University Department of Mechanical Engineering The Hong Kong Polytechnic University The Hong Kong Polytechnic University Shenzhen Research Institute

Causality of linear time-invariant systems inherently defines the wave-matter interaction process in wave physics. This principle imposes strict constraints on the interfacial response of materials on various physical platforms. A typical consequence is that a delicate balance has to be struck between the conflicting bandwidth and geometric thickness when constructing a medium with desired impedance, which makes it challenging to realize broadband impedance modulation with compact structures. In pursuit of improvement, the over-damped recipe and the reduced excessive response recipe are creatively presented in this work. As a proof-of-concept demonstration, we construct a metamaterial with intensive mode density that supports strong non-locality over a frequency band from 320 Hz to 6400 Hz. Under the guidelines of the over-damped recipe and the reduced excessive response recipe, the metamaterial realizes impedance matching to air and exhibits broadband near-perfect absorption without evident impedance oscillation and absorption dips in the working frequency band. We further present a dual-functional design capable of frequency-selective absorption and reflection by concentrating the resonance modes in three frequency bands. Our research reveals the significance of over-damped recipe and the strong non-local effect in broadband impedance modulation, which may open up avenues for constructing efficient artificial impedance boundaries for energy absorption and other wave manipulation.

关键词： impedance modulation acoustic absorption non-local metamaterials

Meta-silencer with designable timbre

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International Journal of Extreme Manufacturing 2023年第2期5卷 230-242页

作者： Nengyin Wang Chengcheng Zhou Sheng Qiu sibo huang Bin Jia Shanshan Liu Junmei Cao Zhiling Zhou Hua Ding Jie Zhu Yong Li Institute of Acoustics&MOE Key Laboratory of Advanced Micro-Structured Material School of Physics Science and EngineeringTongji UniversityShanghai 200092People’s Republic of China AECC Commercial Aircraft Engine Co. LTDShanghai 200240People’s Republic of China Department of Electrical Engineering City University of Hong KongHong KongPeople’s Republic of China

Timbre,as one of the essential elements of sound,plays an important role in determining sound properties,whereas its manipulation has been remaining challenging for passive mechanical systems due to the intrinsic dispersion nature of ***,we present a meta-silencer supporting intensive mode density as well as highly tunable intrinsic loss and offering a fresh pathway for designable timbre in *** global coupling is induced by intensive mode density and delicately modulated with the guidance of the theoretical model,which efficiently suppresses the resonance dispersion and provides desirable frequency-selective wave-manipulation capacity for timbre *** proof-of-concept demonstrations for our design concepts,we propose three meta-silencers with the designing targets of high-efficiency broadband sound attenuation,efficiency-controlled sound attenuation and designable timbre,*** proposed meta-silencers all operate in a broadband frequency range from 500 to 3200 Hz and feature deep-subwavelength sizes around 50 *** work opens up a fundamental avenue to manipulate the timbre with passive resonances-controlled acoustic metamaterials and may inspire the development of novel multifunctional devices in noise-control engineering,impedance engineering,and architectural acoustics.

关键词： designable timbre acoustic metamaterial multi-functional sound silencer resonance modulation

Acoustic Purcell effect induced by quasibound state in the continuum

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Fundamental Research 2024年第1期4卷 57-62页

作者： sibo huang Shuhuan Xie He Gao Tong Hao Shuang Zhang Tuo Liu Yong Li Jie Zhu Institute of Acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China College of Surveying and Geo-Informatics Tongji UniversityShanghai 200092China Department of Physics The University of Hong KongHong Kong 999077China Key Laboratory of Noise and Vibration Research Institute of AcousticsChinese Academy of SciencesBeijing 100190China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China

We study theoretically and experimentally the acoustic Purcell effect induced by quasi-bound states in the continuum(quasiBICs).A theoretical framework describing the acoustic Purcell effect of a resonant system is developed based on the system’s radiative and dissipative factors,which reveals the critical emission condition for achieving optimum Purcell *** show that the quasiBICs contribute to highly confined acoustic field and bring about greatly enhanced acoustic emission,leading to strong Purcell *** concept is demonstrated via two coupled resonators supporting a Friedrich-Wintgen quasiBIC,and the theoretical results are validated by the experiments observing emission enhancement of the sound source by nearly two orders of *** work bridges the gap between the acoustic Purcell effect and acoustic BICs essential for enhanced wave-matter interaction and acoustic emission,which may contribute to the research of high-intensity sound sources,high-quality-factor acoustic devices and nonlinear acoustics.

关键词： Acoustic Purcell effect Bound state in the continuum Mode coupling Sound emission enhancement High-quality-factor acoustic device

Tunable Double-Band Perfect Absorbers via Acoustic Metasurfaces with Nesting Helical Tracks

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Chinese Physics Letters 2020年第5期37卷 64-68页

作者： Shu-Huan Xie Xinsheng Fang Peng-Qi Li sibo huang Yu-Gui Peng Ya-Xi Shen Yong Li Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074 Institute of Acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092

We propose a design of tunable double-band perfect absorbers based on the resonance absorption in acoustic metasurfaces with nesting helical tracks and deep-subwavelength thicknesses(<λ/30 withλbeing the operation wavelength).By rotating the cover cap with an open aperture on the nesting helical tracks,we can tailor the effective lengths of resonant tubular cavities in the absorber at will,while the absorption peak frequency is flexibly shifted in spectrum and the acoustic impedance is roughly matched with *** simulated particle velocity fields at different configurations reveal that sound absorption mainly occurs at the open *** experiment measurements agree well with the theoretical analysis and simulation,demonstrating the wide-spectrum and tunable absorption performance of the designed flat acoustic device.

关键词： tunable absorber absorption

Compact broadband acoustic sink with coherently coupled weak resonances

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Science Bulletin 2020年第5期65卷 373-379页

作者： sibo huang Zhiling Zhou Dongting Li Tuo Liu Xu Wang Jie Zhu Yong Li Institute of Acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Broadband sound sink/absorber via a structure with deep sub-wavelength thickness is of great and continuing interest in physics and engineering *** intuitive technique extensively used is to combine components(resonators)with quasi-perfect absorption to piece together a broad absorbing band,but the requirement of quasi-perfect absorption substantially places a very strict restriction on the impedance and thickness of the ***,we theoretically and experimentally demonstrate that a compact broadband acoustic sink that quasi-perfectly absorbs broadband arriving sound waves can be achieved with coherently coupled‘‘weak resonances"(resonant sound absorbing systems with low absorption peaks).Although each component exhibits rather low absorption peak alone,via manipulating the coherent coupling effect among the components,they collectively provide a remarkably improved performance over a wide frequency range with a significantly compressed *** illustrate the design principle,a hybrid metasurface utilizing the coaction of parallel and cascade couplings is presented,which possesses an average absorption coefficient of 0.957 in the quasi-perfect band(a>0:9)from 870 to 3224 Hz with a thickness of only 3.9 *** results open new avenues for the development of novel and highly efficient acoustic absorbers against low frequency noise,and more essentially,suggest an efficient approach towards on-demand acoustic impedance engineering in broadband.

关键词： Broadband acoustic sink Acoustic metasurface Coherent coupling Imperfect components

基于微穿孔板和卷曲背腔复合结构的低频宽带吸声体

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科学通报 2020年第15期65卷 1420-1427页

作者：李东庭黄思博莫方朔王旭李勇同济大学物理科学与工程学院声学研究所上海200092

通过引入卷曲腔的概念并结合微穿孔板所设计的吸声结构具有深亚波长厚度、低频宽带吸声和高效吸声的特性.通过理论分析、数值模拟和实验,揭示了卷曲吸声结构工作的物理机制.首先在理论上分析单个吸声体的吸声性能并进行了数值和实验验证... 详细信息

通过引入卷曲腔的概念并结合微穿孔板所设计的吸声结构具有深亚波长厚度、低频宽带吸声和高效吸声的特性.通过理论分析、数值模拟和实验,揭示了卷曲吸声结构工作的物理机制.首先在理论上分析单个吸声体的吸声性能并进行了数值和实验验证,两个吸声单体的共振频率分别为282和429 Hz.进一步,基于模耦合理论将低/高频吸声单体联合起来,设计出一个厚度只有100 mm(~λ/12,λ为相对低频吸声单体共振频率对应的波长),在较宽频带(232~533 Hz)内吸声系数大于0.5,在262~469 Hz内吸声系数大于0.8的宽频高效吸声结构.理论、仿真与实验结果符合较好.与传统的大体积吸声结构相比,本研究提出的轻薄高效吸声体具有结构简单和容易制造等特点,在低频噪声控制工程中有潜在的应用前景.

关键词：宽频吸声卷曲腔微穿孔板深亚波长

Innovation Requirements and Progress of Dialysis Water Treatment System

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临床医学工程 2017年第S1期24卷 40-41页

作者： Jun Ke Lifong Yan Taksui Wong Bo Hu Shuang Cui sibo huang Aiyun Cha Jie huang Hongwei Hu Dawen Yun Shaofeng huang Jie Shu Mingming Ma Lianghong Yin Xiangnan Dong Chen Yun Zuhui Chen Fanna Liu Guangdong Medical Instruments Quality Surveillance and Inspection Center of State Food and Drug Administration Department of Nephrology the First Affiliated Hospital of Jinan University Guangzhou Enttxs Medical Products Co. Ltd. Guangzhou Obers Medical Instrument Co. Ltd. Guangzhou Weili Medical Equipment Limited by Share Ltd.

With the development of medicine,people are becoming more and more aware of the quality of medical water supply,such as dial ysis water,dental water,preparation water,operating room water,supply room ***,People are constantly improving the water treatment system and its standardized,and the demand for dialysis water is also becoming more and more *** is an effective means of maintaining the life of renal failure patients,120~180L water will be used for a conventional dialysis treatment,and high flux dialysis will consume more.

关键词： Innovation Requirements and Progress of Dialysis Water Treatment System

Application Status and Prospect of Bio-artificial Liver

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临床医学工程 2017年第S1期24卷 33-36页

作者： Xiaoyi Chen Mingming Ma sibo huang Shuang Cui Huanhuan Liu Jun Ke Shengling huang Xiangnan Dong Huixia Yu Yongpin Lu Chen Yun Yu Mong Fanna Liu B.Hocher Hongwei Hu Jie Shu Lianghong Yin Department of Nephrology the First Affiliated Hospital of Jinan University Guangzhou Medical Instruments Quality Surveillance and Inspection Center of State Food and Drug Administration Guangzhou Obers Medical Instrument Co. Ltd. University of Potsdam Institute of Nutritional Science Guangzhou Enttxs Medical Products Co. Ltd. Guangzhou Weili Medical Equipment Limited by Share Ltd.

Liver failure which can be caused by viral hepatitis,alcohol,drugs,metabolic diseases,autoimmune processes or other fac tors is the end stage of chronic liver *** liver transplantation is currently considered to be the primary treatment measures of chronic liver *** to donor shortages,surgical complications and immune rejection,cell therapy has been extensively studied.?Hepa tocyte transplantation and artificial liver have evolved into a simpler alternative to liver failure *** liver can be used as Liver replacement therapy in patients who were waiting for the liver transplantation with chronic liver *** ideal biological artificial liver must have the liver material metabolism,detoxification,synthesis and secretion and other *** bio-artificial liver has carried out a large number of clinical trials and get some progress.?This article is now discuss the status of bio-artificial liver and its re placement therapy prospects.

关键词： Liver failure Biological artificial liver Liver support