In planning an attempt was made to obtain the maximum momentum for the selected dimensions of the brake (see section 6.3), which makes it possible to reduce the applied moment of inertia of the rotating parts of the brake and as a rule, the additional dynamic loads on the spacecraft. The maximum force of coupling determined analogous to the “rod and cone” type docking mechanism. The differential connection between the screws is implemented in the rod connection mechanisms (Figure 3.12), which is located on the ring with guides. This mechanism, which was developed in the creation of the APDA, was successful in all basic characteristics (kinematic and force schematics, configuration, etc.). Figure 3.12. Mechanism which connects the screws (Soyuz APDA). 1. left screw; 2. spring mechanism; 3. misalignment sensor; 4. measuring potentiometer; 5. electromechanical brake; 6. right screw. The mass of rotating parts of the three connection mechanisms m2,Cf is applied to the forward displacement of the ring. The parts are symmetrically arranged at an angle of 120*, and the mass is defined by the formula
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