聲能吸收超材料

用傳統方法吸收低頻率聲音效果不佳，因所需之隔音層厚度過高。此創新吸音材料可以解決不同頻率範圍的噪音問題。此材料可製造成消聲面板或隔音牆，應用於室內和室外環境，例如降低航機和船舶內客艙的噪音，調節音樂廳和會議廳的音質，以及控制高速公路或鐵路沿線建築物的環境雜音。Low-frequency sound is difficult to absorb via conventional methods because the dissipation in linear systems is quadratic to frequency. The current absorption material can solve the sound attenuation problems over a wide frequency range. Absorptive metamaterial panel or the absorptive wall can be made with this design, with applications in both indoor and outdoor environments, such as lowering the cabin noise in airliners and ships, tuning the acoustic quality of music/convention halls, and environmental noise abatement in buildings along highways and railways

消聲結構

一种消声面板由实质透声的平面刚性框架构成，该刚性框架分成多个单独的大体二维单元。挠性材料薄片固定至刚性框架，以及，多个薄块固定至挠性材料薄片，使得每一个单独单元设置有各自的薄块，以建立共振频率，该共振频率由框架的平面几何特性、挠性材料的挠性、以及薄块限定。单元分成至少两种不同类型的单独单元，构造成使得，由不同类型单独单元的第一类单元发出的声波，与由不同类型单独单元的第二类单元、或不同类型单独单元的聚集体发出的声波，形成消声模式。A sound attenuation panel is configured with a substantially acoustically transparent planar, rigid frame divided into a plurality of individual, substantially two-dimensional cells. A sheet of a flexible material is fixed to the rigid frame, and a plurality of platelets fixed to the sheet of flexible material such that each individual cell of the plurality of cells is provided with a respective platelet to establish a resonant frequency, the resonant frequency defined by the planar geometry of the individual cells, the flexibility of the flexible material and the platelets. The cells are divided into at least two different types of the individual cells, configured so that sound waves emitted by a first type of said different types of individual cells establishes a sound cancellation pattern with sound waves emitted by a second type of said different individual cells or an aggregation of different types of the individual cells

兼具負有效質量密度和負有效體彈模量的聲學功能材料

本發明涉及兼具負有效品質密度和負有效體彈模量的聲學功能材料，其具有至少一個管狀部分、以及密封該管狀部分兩端的前薄膜和後薄膜。 所述密封該管狀部分的前薄膜和後薄膜將該管狀部分充分密封，從而建立起由該管狀部分和所述前薄膜及後薄膜限定的密封或受限的封閉流體空間，並杜絕因聲學振動而導致的流體流失或流體攝入。 在所述前薄膜和後薄膜上設置一對片狀物，使得這對片狀物中的一者大體上處於所述前薄膜的中心，而另一者大體上處於所述後薄膜的中心

雜化共振引起的超常聲學吸收和雜化共振超材料表面的聲電能轉換

一種聲音吸收超材料包括被構造為使入射聲波的反射最小化的聲阻抗匹配表面。所述表面包括彈性或柔性薄膜(121)和安裝在薄膜(121)上的實質上為剛性的重物(123)。相對固體表面作為反射表面設置並位於薄膜(121)後方。所述反射表面相對於彈性或柔性薄膜(121)隔開預定距離，從而形成薄膜(121)與固體表面之間的流體空間。安裝在薄膜(121)上的重物(123)與彈性薄膜(121)相結合建立了多個本征頻率。A sound absorbing metamaterial comprises an acoustic impedance-matched surface configured to minimize reflection from an incident acoustic wave. The surface is comprised of an elastic or flexible membrane and a substantially rigid mass mounted on the membrane. A relatively solid surface is provided as a reflective surface and is positioned behind the membrane. The reflective surface is separated by a predetermined distance from the elastic or flexible membrane and forms a fluid space between the membrane and the solid surface. The mass mounted on the membrane, in combination with the elastic membrane establish a plurality of eigenfrequencies

薄膜型聲學超材料的主動控制

Sound attenuation is performed using a sound attenuation panel using an electromagnetic or electrostatic response unit to modify resonance. The sound attenuation panel has an acoustically transparent planar, rigid frame divided into a plurality of individual cells configured for attenuating sound. In one configuration, each cell has a weight fixed to the membrane. The planar geometry of each said individual cell, the flexibility of the membrane, and the weight establish a base resonant frequency for sound attenuation. The electromagnetic or electrostatic response unit is configured to modify the resonant frequency of the cell