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本頁翻譯進度

燈號說明

審定:吳士傑(簡介並寄信)
翻譯:沈茂霖(簡介並寄信)
編輯:侯嘉玨(簡介並寄信)


以下是這整個學期將會提及的主題:

A. 波動的物理來源例證

  • 緊繃的弦
  • 彈性桿件
  • 動脈中的血流
  • 導管中的聲音
  • 彈性基礎上的樑
  • 高速公路的車流
  • 線性化條件下的淺水長波
  • 參觀非破壞性檢測實驗室

B. 一維傳遞

  • 通解,動脈裡的分支,阻抗
  • 無限場域裡的波、D'Alembert's德藍伯特理論
  • 特徵函數
  • 半無限場域及反射
  • 一無限場域裡的強制波動
  • 彈性環境下的弦,頻散
  • 群波速及能量傳輸
  • 暫態頻散、定常相位法
  • 定常相位法
  • 諧波的散射及輻射,弱散射
  • 長水波由水深不連續引致之強散射
  • 輻射條件,Green格林函數
  • 一般等式,Green格林定理
  • 緩變介質中的反射,WKB近似值法

C. 二維傳遞

  • 平面波於介面中的反射與透射
  • 複雜波的入射角及反射係數
  • 固態平面彈性波,統御方程式
  • 無限域中的自由波,平面彈性波
  • 平面邊界中的彈性波反射
  • P波和SV波
  • SH波
  • SH波的散射
  • 散射中的光學原理
  • SH波於圓孔穴的散射
  • 線裂痕下的SH波繞射─拋物線近似
  • 半平面下的雷利波表面波
  • 地表面上移動的線負載所造成的彈性波:超音速、穿音速、次音速

D. 海洋中的波浪

  • 線性化方程式
  • 定水深之海洋前進波;頻散及流場;水粒子軌跡及能量傳輸
  • 二維障礙物下的波阻
  • 窄譜下的頻散波;由Schrodinger方程看包絡波。
  • 由自由液面的振動線壓力源所強制引發的輻射表面波
  • Kelvin船波
  • 成層流體的內波;頻散關係
  • 非侷限流的內波,St. Andrew's Cross

E. 隨機介質中的頻散波

  • 非規則下的局部化

依據同學興趣及時間,我們可能探討

F. 波通過夾層介質

  • 薄片介質中的適用方程式
  • 厚片介質中的適用方程式

G. 非線性波

  • 交通量波動、綠燈及紅燈
  • 震波及交通擁塞
  • 湧浪及水躍
  • 潰壩下的湧浪




The following topics will be covered throughout the semester:

A. Sample Physical Origins of Wave Motion

  • Taut String
  • Elastic Rod
  • Blood Flow in Arteries
  • Sound in a Pipe
  • Beam on an elastic foundation
  • Traffic Flow on a Freeway
  • Long Waves in Shallow Seas, Linearization
  • Visit to the Nondestructive Evaluation Laboratory

B. One dimensional propagation

  • General Solution, Branching of Arteries, Impedance
  • Waves in an Infinite Domain, D'Alembert's Theory
  • Characteristics
  • Semi-infinite Domain and Reflection
  • Forced Waves in an Infinite Domain
  • String in an Elastic Surrounding, Dispersion
  • Group Velocity and Energy Transport
  • Transient Dispersion, Method of Stationary Phase
  • Method of Stationary Phase
  • Scattering and Radiation of Harmonic Waves, Weak Scattering
  • Strong Scattering of Long Water Waves by Depth Discontinuity
  • Radiation Condition, Green's Function
  • General Identities, Green Theorem
  • Reflection in a Slowly Varying Medium, WKB Approximation

C. Two dimensional propagation

  • Reflection and Transmission of Plane Waves at an Interface
  • Angle of Incidence, Reflection coefficient in the Complex Wave
  • Elastic Wave in Solid, Governing Equations
  • Free Waves in Infinite Space, Plane Elastic Waves
  • Reflection of Elastic Waves from a plane boundary
  • P and SV waves
  • SH Waves
  • Scattering of SH waves
  • The Optical Theorem on Scattering
  • Scattering of SH Waves by a Circular Cavity
  • Diffraction of SH Waves by a line crack - Parabolic Approximation
  • Rayleigh Surface Waves in a Half Space
  • Elastics Waves due to a line load traveling on a the Ground Surface. Supersonic, Transonic, and Subsonic

D. Waves in the sea

  • Linearized Equations
  • Progressive Waves in Sea of Constant Depth. Dispersion and Flow Field. Particle Orbit and Energy Transport
  • Wave Resistance of a Two Dimensional Obstacle
  • Narrow banded dispersive waves. The Schrodinger equation for the Wave Envelope.
  • Radiation of Surface Waves Forced by an Oscillating Line Pressure on the Surface.
  • Kelvin Ship Waves
  • Internal Waves in a Stratified Fluid. Dispersion Relation.
  • Internal Waves in an Unbounded Fluid, St. Andrew's Cross

E. Dispersive Waves in Random Media

  • Localization by Disorder

Depending on class interest and time we may discuss

F. Waves through laminated media

  • Effective Equation for Thin Laminates
  • Effective Equation for Thick Laminates

or

G. Nonlinear waves

  • Traffic Waves. Green and Red Lights.
  • Shocks and Traffic Jam
  • Bores and Hydraulic Jumps
  • Bore from the Breaking of a Dam



 
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