in a peripheral docking device the diameter of the docking frame may not be less than 2Ar. For a docking device which forms a transition tunnel with a diameter the diameter of the tunnel has a substantial effect on in turn, cir determines the size of the transferred load and requirements on the comfort of transition (Table 2.6). It is reasonable that in the first type of docking device the diameters of the tunnel and receiving cone are about the same. Table 2.6. Diameters of locks and transition tunnels of docking devices. Depending on the size of the adjoining compartments of the spacecraft, and the required rigidity and durability of the docking device, the size of the docking frame may change. In determining one should consider that an increase in significantly increases the size and mass of construction. And not only transverse dimensions are increased. For angular deviations due to the initial conditions and additional rotations in the process of linkage and thereafter, the docking frames and the protruding elements of the docking assembly and other parts of the spacecraft may not touch each other. Thus, the larger the diameter of the frame, the larger the distance between the docking frames after linkage. As a result, as increases, the course of the buffer element of the docking mechanism increases, as does the longitudinal size of the docking device. One must also consider that in hermetic docking devices the force of internal pressure expanding the joint is proportional to the square of the diameter of the seal of the joint. 2.5.5. FJements of Control and Signaling The docking device is equipped with drives and sensors, and as a rule, one tries to minimize the number of drives. Tn active docking assemblies the following
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