Để To simulate these conditions, both for the testing of the MR valves and the entire DVMCS, we designed the test bench shown in Figure 13. The test piece (5) is supported by linear bearings
(4) trên m T 'uphole' cu áp d Gi gi (4) on a large load frame (6). At the ‘uphole’ end, to the left, a large pneumatic cylinder (1)
applies a force simulating the loading from the drill string above the tool. The damping of the drill string motion is simulated by two hydraulic cylinders (2) configured to produce adjustable
damping. To mimic the driving force of the bit’s interaction with the bottom of the well, a lower assembly (7) is provided. In this assembly, a cam (8) is rotated by a variable speed gear motor
(9) at rates simulating the drillstring rotation rate. The cam, which is supported by ball bearings, can have a configuration to mimic a variety of degrees of irregularity of the well bottom.
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