19 Periodic action

Instead of continuous action, use periodic or pulsating actions.
  • Hitting something repeatedly with a hammer
  • Replace a continuous siren with a pulsed sound.

If an action is already periodic, change the periodic magnitude or frequency.
  • Use Frequency Modulation to convey information, instead of Morse code.
  • Replace a continuous siren with sound that changes amplitude and frequency.

Use pauses between impulses to perform a different action.
  • In cardio-pulmonary respiration (CPR) breathe after every 5 chest compressions.
TRIZ principe 19


The colour indicates the ranking of the proposed principle to solve the contradiction: 1st, 2nd, 3rd, 4th.
This ranking reflects the frequency of occurrence of the principle in the analysed patents for this type of contradiction.
When a principle appears in first position, it means that it is statistically the most used in the patents studied for this type of problem.

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