Abstract
The angular vibration is concerned in many fields such as satellite platform, manufacturing equipment for micro-electromechanical systems. However, the angular vibration with a frequency more than 15 Hz is difficult to be measured by traditional gyroscopes. The angular vibration sensor based on Magnetohydrodynamics can meet the requirements of both wide bandwidth and higher precision. In order to optimize the structure, a response of conducting fluid in the static magnetic field to the angular vibration is modeled in this paper. Based on this model, the sensitivity of the design parameters of magnetic field intensity, conducting fluids' height and width are analyzed to get an optimized parameter for higher precision and bandwidth. A prototype was developed to verify the analysis and optimization. The experiment results showed that the model is accurate with 6.7% error in lower-cut-off frequency and 1.4% error in scale factor. It can meet the design requirement of 6–1000 Hz.
Highlights
Posture direction of the payload in a satellite platform has two basic requirements
Measurements of angular vibration with wide bandwidth rely on angular vibration sensors
There have been several sensors widely used on satellite platforms to measure the micro-radian angular vibration with high precision and wide bandwidth
Summary
Posture direction of the payload in a satellite platform has two basic requirements. The first is a very higher precision with an ultra-low noise, and the second is the wide bandwidth to a frequency of 2000 Hz. Xu proposed a parallel magnetic field scheme to design and realize a prototype, and finished the corresponding testing [17], improved its performance with new methods and structures in follow-up researches [18,19,20,21]. All these reports did not reveal the precise transfer function from the angular vibration to the voltage output. A prototype was manufactured to verify the model and the design
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