A Closed-loop Test Method for Damping Coefficient of Q-Flex Accelerometer
Aerospace-Quartz-Accelerometer-3
Q-Flex accelerometer is a kind of inertial measurement device, which utilizes the quartz pendulum to measure the acceleration of the object by the characteristic of deviating from the equilibrium position by the inertial force. Thanks to the low temperature coefficient of high-purity quartz material and stable structural characteristics, Q-Flex accelerometer has high measurement accuracy, low measurement noise, good long-term stability, and is widely used in attitude control, navigation and guidance of aircraft, as well as geological exploration and other industrial environments.
1.Detection method for Q-Flex Accelerometer
When the system is open-loop, because the system can not produce feedback moment, the pendulum assembly is subjected to weak inertia moment or the active moment of the torque converter, the quartz pendulum easily touches the yoke iron and saturated phenomenon, which makes it very difficult to test the damping parameters under the open-loop, therefore, the damping parameters are considered to be measured under the closed-loop state of the system.
The closed-loop frequency characteristics of the control system reflect the variation of the amplitude and phase of the output signal with the frequency of the input signal. The frequency response of the stabilized system is at the same frequency as the input signal, and its amplitude and phase are functions of the frequency, so the amplitude-phase characteristic curve of the frequency response can be applied to determine the mathematical model of the system. In order to obtain the actual damping parameters of the accelerometer, the closed-loop frequency response measurement method is used.
In the closed-loop frequency response measurement method, the accelerometer is fixed on the horizontal vibration table in the "pendulum" state, so that the acceleration input direction of the vibration table is aligned with the sensitive axis of the accelerometer and the accelerometer is placed horizontally in the "pendulum" state, which can eliminate the asymmetry of the gravitational force on the input acceleration. The horizontal placement of the accelerometer in the "pendulum state" eliminates the effect of gravity on the asymmetry of the input acceleration.
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