For and small angles and , the angular velocity during linkage is defined by the initial value and the momentum of longitudinal momentum sin . During linkage with a “heavy station” the angular velocity of which is small, the angular velocity of rotation is mainly defined by the momenta and It should be noted that even when there is only an initial longitudinal velocity one should not limit consideration only to the momentum, which is equal to sin since in this case momentum Ny has a substantial effect. 5.4. Requirements on the Shock Absorption Systems The shock absorption system should provide shock absorption of the interaction of spacecraft during displacements in six degrees of freedom in a given range of initial conditions considering velocities acquired during previous impacts in all possible relative positions (cases of interaction). The value and character of the forces should not be reduced to overload of the docking device or the spacecraft as a whole; shock absorbers should have a specific energy capacity and their course should not exceed given limits. The configuration of the guide and buffer elements, as well as the characteristics of the shock absorbers should provide a relative movement to align the latches (linkage) and prevent collision of other elements of the docking device or spacecraft structures. The choice of the type and characteristics of shock absorbers must be linked with the general scheme of the shock absorption-drive system of the docking device. As shown in Chapter 2, the best characteristics are usually possessed by a combined shock absorption-drive system. The goal of the calculation is usually a determination of the basic parameters of the shock absorbers: rigidity and initial compression of the springs, the coefficient of attenuation , maximum course inertia of the moving parts, etc. In the calculation one also determines the forces in effect, the coefficient of recovery s, the perturbations of the spacecraft, and other parameters. The schemes and characteristics of shock absorption systems of various
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