Figure 7.4. Complex mechanical dynamic test unit. 1. spring compensator; 2. model of Apollo spacecraft; 3. television camera; 4. model of Soyuz spacecraft; 5. start-up lock; 6. spring compensator with jet control system imitator; 7. entry system; 8. control panel. docked spacecraft. The rigidity characterisics of the compartments adjoining the docking assemblies are also reproduced. The spring compensators are adjusted in the assembled unit so that a force is created in the compensator cable equal to . The parameters of the mechanism are chosen such that the compensation error deviates from the calculated value by no more than 1-2%. The compensators may also be used to reproduce the longitudinal thrust of the jet control system engines. In this case the force of the compensator is adjusted to the value The acceleration to the required velocity is done by deviating the suspended object by an additional angle , at which the force is not compensated. The value of the additional angle may be easily determined by measuring the potential and kinetic energy of the model
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