| 摘要 |
A cylindrical or spherical body comprises multiple acceleration sensors (S1, S2..SX) sensitive in a radial direction from the centre of the sphere of the mine. The output signals (1,2...X) proportional to the instantaneous acceleration are fed to an effective value element (RMS) and to a signal processing circuit, whose output signals (Z1,Z2....ZX), dependent on the amplitude of the input signals (1,2...X), control individual drive devices (B1,B2...BX).
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