聲阻抗差 的英文怎麼說
中文拼音 [shēngzǔkàngchā]
聲阻抗差
英文
acoustic impedance difference-
But to circular plate with large surface area, the vibrate modes generated is often so high that there is reverse phases existing, which result in a decrease in radiation impedance, electric - acoustic efficiency and the electric power, as well as poor directivity
然而對于輻射面積較大的彎曲振動圓盤，一般激勵的振動階數比較高，因此存在彎曲振動的反相區，導致換能器的輻射阻抗下降，電聲效率和聲功率降低以及指向性變差等問題。The analytical mode is based on the theory of sound propagation in layered media. the concept of equivalent parameters is established. the absorption of sound energy by damping layer ' s is represented by use of complex sound impedance
解析模型以分層介質中的波動理論為基礎，建立了等效參數的概念，並運用聲阻抗的復數表示法把阻尼層對介質層聲能吸收的影響都考慮進去，通過比較敷設消聲覆蓋層前後多層傳遞損失的差異來獲得消聲層的效率。When the acoustic impedance contrast between the thin dipping interface and its adjacent formations exits, their interfaces can be observed from the snapshots, but the acoustic field is rather complex
4 、當傾斜薄夾層的聲阻抗與其鄰層的聲阻抗相差較大時，盡管從波場圖中可以大致看出兩個地層界面的存在，但此時聲場分佈非常復雜。It is well known that the coupled interactions between the ship hull and the surrounding fluid field of explosion give rise great influence to both the fluid loadings over the structural wetted surface and the responses of the hull. jt is the coupling effect that provides the major difficulties in the underwater explosion induced dynamic responses of the ship structure. the second order doubly asymptotic approximation method ( dda2 ) has been commonly employed in the world to deal with the coupling effect
本文針對daa方法不適合於分析敷有聲阻抗與水差不多的聲學材料（如玻璃鋼與消聲瓦）的船體結構與水下沖擊波相互作用的局限性，依據聲波的反射和透射原理對二階daa方法的高頻段進行了改進，發展並提出了能夠分析聲學材料流固相互作用的adaa方法（ acousticdaa ） ，拓展了應用范圍，使現有的二階daa方法成為它的一個特例。分享友人