Wave Dynamics
摘要
In this chapter, we focus on the physics behind wave dynamics. After reviewing the harmonic oscillation of point mass-spring systems, we discuss how oscillatory motions transition into a wave. We derive wave equations from the equation of motion for oscillatory dynamics in air and solids. Considering some solutions to the wave equation, we discuss the propagation of waves as a flow of energy, along with related topics such as acoustic impedance and acoustic wave intensity. Finally, after briefly reviewing the laws of reflection and refraction, we discuss the propagation of acoustic waves through the boundary of media having different elastic properties.