4. Conclusion

In 1995, Roure [41] wrote "Le contrôle actif, mais oui ça marche! This somewhat provocative title is a response to a criticism often levelled at active control, namely that there's a lot of talk about it, that the laboratory and simulation results are promising, but that it hardly ever works in practice". This sentence reflects the optimism of the time. Developments in digital electronics, the creation of technology transfer companies focused on active control, and the impressive number of scientific publications on the subject, suggested that the conditions were ripe for the industrial application of active control. What is the situation today?

• From a scientific point of view, the first thing to remember is that there are physics-related limits to active control. The two main...