Same word as judder:
beating, fluctuation, judder, oscillation, pulsation, pulse, quake, quiver, resonance, reverberation, shake, shimmy, throb, throbbing, trembling, tremor, vacillation, wave, wavering
beating, fluctuation, judder, oscillation, pulsation, pulse, quake, quiver, resonance, reverberation, shake, shimmy, throb, throbbing, trembling, tremor, vacillation, wave, wavering