1, problem description
How to protect the safety of drivers and passengers to the greatest extent in the case of car collision? The inflation pressure of airbag is insufficient, which can not effectively protect passengers; If the inflation pressure of the airbag is too high, it will cause too high pressure and cause harm to passengers.
2, the ideal solution to the problem
When the airbag collides, it can inflate the airbag to a suitable pressure to protect the safety of passengers.
3. Technical and physical contradictions in the system.
Technical contradiction: speed up the expansion of airbags to protect passengers; However, with the acceleration of airbag inflation, the large stiffness of airbag will hurt passengers. The corresponding technical contradiction is:
① Parameters that need to be improved: the action time of moving objects (accelerating the expansion speed of automobile airbags);
② Deterioration parameters: harmful factors caused by objects (airbag inflates too fast to hurt passengers).
Physical contradiction: airbag inflation should be fast, not too fast. Too fast inflation will harden the airbag and hurt passengers; The slow inflation speed will cause the airbag to fail to effectively protect passengers.
Step 4 Find available resources
Available resources: air, pressure, airbag itself, safety belt, etc.
5, using TRIZ tools-innovation principle, separation principle, etc.
According to the technical contradiction in the system, four innovative principles (2 1, 39, 16, 22) are retrieved from the contradiction matrix.
① Innovation Principle 2 1: Time to reduce harmful effects;
② Innovative principle 39: inert or vacuum environment;
③ Innovation principle 16: insufficient or excessive function;
④ Innovation Principle 22: Turn harm into benefit.
According to the physical contradiction in the system, four separation principles are adopted to try to solve it: spatial separation; Time separation; Conditional separation; Separation of whole and part.
6. Generate new ideas and technical implementation plans.
Innovative principle 16: "insufficient effect or excessive effect" means that when the expected effect is difficult to achieve 100%, the scope of action will be increased to an achievable level, thus simplifying the problem. Based on this innovative principle, students are inspired that airbags can quickly expand to a certain pressure value. So as to ensure that the air pressure for protecting passengers can be achieved in the shortest time, and the air bag is provided with a plurality of micropores; When the airbag pressure exceeds the threshold, the airbag micropores are opened, so that the airbag pressure does not rise any more. So as to solve the contradiction that the inflation speed of the airbag should be fast but not too fast.
7. Program evaluation
This scheme can make the airbag fill up quickly in a short time when the car has an accidental collision, and will not cause additional harm to passengers because of the high pressure value of the airbag. The improved airbag will be able to automatically adjust its hardness.
8, innovative teaching practice effect
The education and cultivation of innovative talents is a systematic project. The foundation of innovation comes from rich and solid technical knowledge, which can be guaranteed by strictly implementing the teaching plan in practice; The motive force of innovation comes from the development and progress of society, and it needs to cultivate students' keen insight in many aspects; Innovative thinking methods are varied and eclectic, but they can be acquired and strengthened through engineering training. The study of TRIZ principle is a useful attempt in this respect.