Waveguide ``Equivalent Circuits'' for the Uniformly Moving Rigid String Termination

a) Velocity waves        b) Force waves

• String moves with speed $v_0$ or 0 only
• String is always one or two straight segments
• ``Helmholtz corner'' (slope discontinuity) shuttles back and forth at speed $c$
• String slope increases without bound
• Applied force at termination steps up to infinity
  • Physical string force is labeled $f(n)$
  • $f_0 = Rv_0 =$ incremental force per period