Figure 7.16. Horizontal test unit for the APDA. 1. rocking load; 2. compensator Tor the weight of the ring; 3. active APDA; 4. passive APDA; 5. load rotating in roll; 6. start-up mechanism; 7. imitator of the jet control system. immobile base. Due to changes in the position of the adapter, testing is done at different angles between the longitudinal axes of the assemblies at the moment of contact of the rings with guides; this case, which is reduced to the interaction of rings, as shown in section 5.6.3, is essential for APDAs. Other parameters of the unit are defined using (7.3). Thus, the test unit has three degrees of freedom and can perform docking with different initial conditions with the reproduction of five basic cases of interaction: 1) central impact; 2) impacts with roll; 3) guides among themselves; 4) guides with the ring; 5) impact of the rings. To accelerate the trolley and create loads on the drive of the docking mechanism a principal scheme with a “falling” weight is used, similar to that described above. There is an additional mechanism with a cable connection and a control system to stop it and remove it to simulate the thrust of the longitudinal engines of the jet control system, which assists linkage. The value of the equivalent thrust is defined by the approximate formula , (see section 5.6.3) and it is activated on a signal from the contact sensors of the APDA, if necessary with a given temporal delay.
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