2009, 29(1): 102-106.
doi: 10.11728/cjss2009.01.102
Abstract:
According to the principle of general relativity, in this paper the reference frame is chosen as the satellites, which levitate freely in the orbit under ideal circumstance, The movement of the test mass and the electrode cage of the electrostatically suspended accelerometer are discussed and the dynamics equation of test mass motion, inside the electrode cage is obtained. It is beared out, that the visible lacunan is in the similar expression offered by references [1],
[2]. The servo-control circuitry of the electrostatically suspended accelerometer is analyzed and the expressions of the electric damp coefficient, the closed loop natural angular frequency (i.e. the basic angular frequency of the accelerometer), the angular frequency dominated by the uncontrolled stiffness, such as the electrostatic negative stiffness, the acceleration from electrostatically suspending and the relatively displacement of the test mass etc are presented. It is put forward that the gain of the servo-control circuitry must be sufficient to provide the appropriate closed loop natural angular frequency. The expressions of the acceleration noise caused by the position noise are offered. It is proved, that the relatively displacement of the test mass is nearly naught in the frequency bandwidth of the suspension, when the gain of the servo-control circuitry is sufficient.
