Dynamic excitations and the resulting stresses in a weaving mill can affect its functioning in many different ways. Possible consequences of service vibrations include emission of acoustic waves, reduction of product quality, damage of non-structural elements (especially partition walls and cladding) and the disturbance of the activity in buildings placed in close vicinity. It is difficult to identify the influence of the vibrations on the production, on the weaving shed and on the neighborhoods. In 2004, an Italian company has rented in Romania 6000 square meters in a huge, one level industrial building, in order to lay out a weaving mill. Connected to this building there is a small five level office building having 256 square meters in plane. Two categories of weaving looms were installed, air-jet based type and rapier based type. One may say that it was another well-known classical result of the acquisition of second hand equipment. This situation was often encountered in Romania in the last twenty years due to the poor economic situation of the country and to the set up of various private companies which could not afford new equipment. It was not the case, as the Italian company supplied the weaving factory with last generation weaving looms. When the machines started to operate, severe vertical vibrations were generated in the industrial building and annoying acoustical vibrations were induced in the office building, felt especially at the fifth floor. Practically, nobody could stay for more than 10 minutes in any room of that floor. In addition, the high intensity of the vertical vibrations affected the operation of sensitive electronic equipment and, as a result, a business center located at the fifth floor closed its activity. This made the owner lose a big amount of money obtained by renting the spaces. The owner of the building, together with the Italian company, asked R.N.C.E.E.V. to identify the source of the annoying vibrations and to find a technical solution in order to avoid them. As such a case is not frequently encountered and the technical literature is very poor on the subject, the author considers it of interest to be presented. In the paper, the entire process carried out in order to solve this spectacular case of annoying vibrations will be presented
