Abstract: Unidirectional vibration testing apparatus under a controlled atmosphere comprising a tight enclosure (10) in which is placed a support (24) for the equipment to be tested and a vibration generator (18) positioned outside the enclosure and connected to the support by a connecting rod (22). The latter is connected to two opposite walls (10a, 10b) of the enclosure by two identical sealing systems (26, 34) mounted in opposition, so as to eliminate the parasitic or spurious effects induced by the sealing system (26), which must be placed between the rod (22) and the wall (10a) located between the vibration generator (18) and the support (24).

Abstract: A measuring apparatus for determining the mass-related characteristics of a body has a base which supports a receiving table for the body mounted so as to oscillate about an approximately vertical axis on either side of an angular equilibrium position to which the table is returned elastically. The base and the table are provided with an angular position detector and blocking elements. The base is supported by a movable structure which rests on a stand and is mounted so as to oscillate about an adjustable horizontal axis which intersects said vertical axis at an adjustable height on either side of a stable angular equilibrium position. The base and the movable structure are provided with a system for detecting angular position and with means for adjusting the height of the instantaneous horizontal axis of oscillation. The apparatus also has means for positioning and blocking the body with respect to the movable structure.

Abstract: A dynamic balancing system has a chamber (21) which surrounds a rotating object (3) which is equipped with protruding objects and which chamber rotates around the same shaft in order to move the air (20) surrounding the object (3) and to reduce the aerodynamic forces. This has application to the balancing of artificial satellites.