28 Mechanics substitution

Replace a mechanical means with a sensory (optical, acoustic, taste or smell) means.
  • Connected door lock opening via smartphone proximity instead of a mechanical key.
  • Replace a physical fence to confine a dog or cat with an acoustic fence (signal audible to the animal).
  • Use a bad smelling compound in natural gas to alert users to leakage, instead of a mechanical or electrical sensor.

Use electric, magnetic and electromagnetic fields to interact with the object.
  • To mix 2 powders, electrostatically charge one positive and the other negative. Either use fields to direct them, or mix them mechanically and let their acquired fields cause the grains of powder to pair up.

Change from static to movable fields, from unstructured fields to those having structure.
  • 5G beamforming: the antenna steers a focused signal toward each user instead of broadcasting in all directions.

Use fields in conjunction with field-activated (e.g. ferromagnetic) particles.
  • Heat a substance containing ferromagnetic material by using varying magnetic field. When the temperature exceeds the Curie point, the material becomes paramagnetic, and no longer absorbs heat.
Principe 28 : Connected door lock opening via smartphone proximity instead of a mechanical key.


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Concrete examples

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Is this TRIZ principle frequently used?

This principle is often used with 229 instances in the matrix.

This principle is proposed to solve the following contradictions:

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1/7 1/14 1/25 1/28 1/29 1/32 1/34 1/37 2/14 2/17 2/20 2/22 2/27 2/28 2/32 2/34 2/37 2/39 3/28 3/29 3/34 3/39 4/2 4/10 4/14 4/22 4/23 4/27 4/28 5/11 5/28 5/30 5/38 6/28 7/13 7/28 7/29 8/13 9/1 9/10 9/13 9/17 9/23 9/27 9/28 9/29 9/30 9/33 9/34 9/36 10/2 10/4 10/9 10/29 10/33 10/39 11/5 11/28 12/28 12/32 12/36 13/3 13/7 13/8 13/9 14/4 14/6 14/21 14/23 14/25 14/36 15/12 15/19 15/23 15/25 15/30 16/25 17/9 17/25 17/39 18/32 18/33 19/1 19/3 19/15 19/32 19/34 19/36 19/39 20/23 21/14 21/23 21/38 21/39 22/1 22/39 23/4 23/9 23/14 23/15 23/20 23/21 23/28 23/33 23/36 23/39 24/25 24/26 24/27 25/14 25/15 25/16 25/24 25/28 25/29 25/32 25/33 25/35 25/37 25/38 26/9 26/24 26/27 26/28 27/2 27/4 27/9 27/10 27/14 27/24 27/26 27/37 28/1 28/2 28/3 28/4 28/5 28/6 28/9 28/11 28/12 28/14 28/15 28/17 28/23 28/25 28/30 28/37 28/38 28/39 29/1 29/2 29/3 29/5 29/9 29/10 29/25 29/30 29/38 30/5 30/9 30/15 30/28 30/29 30/33 31/9 31/10 32/1 32/12 32/18 32/19 32/25 32/37 32/38 32/39 33/10 33/12 33/14 33/23 33/25 33/30 33/39 34/3 34/15 34/19 34/26 35/25 35/36 35/39 36/9 36/12 36/14 36/15 36/19 36/23 36/35 36/37 36/39 37/1 37/2 37/10 37/14 37/25 37/27 37/28 37/30 37/32 37/36 38/1 38/2 38/3 38/9 38/21 38/22 38/25 38/28 38/29 39/2 39/3 39/10 39/14 39/17 39/22 39/23 39/28 39/32 39/33 39/35 39/36


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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