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A method for collecting the rotational speed of a momentum wheel

A collection method and momentum wheel technology, which are used in measurement devices, linear/angular velocity measurement, velocity/acceleration/impact measurement, etc., can solve the problems that the accuracy and real-time performance cannot meet the test requirements, and achieve timely data update and high test accuracy. Effect

Active Publication Date: 2015-10-21
BEIJING INST OF CONTROL ENG
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  • Application Information

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Problems solved by technology

However, for a high-precision test system with a sampling period of 4-8ms, a momentum wheel working at 500-5500rpm, and stability requirements, its accuracy and real-time performance cannot meet the test requirements.

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  • A method for collecting the rotational speed of a momentum wheel
  • A method for collecting the rotational speed of a momentum wheel
  • A method for collecting the rotational speed of a momentum wheel

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Embodiment Construction

[0023] The present invention will be further introduced below in conjunction with the accompanying drawings.

[0024] Such as figure 1 , the present invention improves the technology designed from the following three aspects in order to realize the high-precision and fast acquisition of the momentum wheel speed.

[0025] 1. Stability design of speed pulse acquisition

[0026] In the present invention, the speed pulse is the object to be measured. Since the distance from the output of the momentum wheel circuit box to the speed acquisition system is long, the rise time and fall time of the pulse signal are relatively long (about 10 μs ~ 30 μs), but From the measured waveform, it can be found that the repeatability of the pulses generated by the same sensitive element (there are 24 sensitive elements in the momentum wheel, which generate 24 speed pulses per week) is very good. In the present invention, the acquisition of the pulse adopts the fixed comparison level detection me...

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Abstract

The invention discloses a rotating-speed acquisition method for a momentum wheel. The method comprises the steps that 1) multiple sensing elements which are acquired in the momentum wheel are determined; 2) output signals of the sensing elements are acquired via fixed comparison level detection and hysteresis comparison, and are stored according to periods of the output signals, wherein the output signals are rotating-speed pulse signals; and 3) aberrant points of the stored output signals are eliminated, and then at the data update moment, the output signals which are stored most recently are read, and weighted averaging is carried out on the output signals to calculate the rotating speed of the momentum wheel. The method can highly precisely and rapidly acquire the rotating speed of the momentum wheel.

Description

technical field [0001] The invention relates to a method for collecting the rotational speed of a momentum wheel. Background technique [0002] The momentum wheel is an important actuator on the spacecraft. In the ground test, the simulated satellite (dynamic software) generally directly converts the rotational speed change of the momentum wheel set into the control torque to control the attitude of the satellite. The measurement and acquisition accuracy and time delay of momentum wheel speed will directly affect the degree and effect of simulation, thus affecting the effectiveness of ground testing. [0003] In the original test plan, two methods of low-frequency counting and high-frequency width measurement are used: [0004] 1. Low frequency counting method [0005] Design a timing counter, timing 2.5s, use this timer to count the momentum wheel speed pulses, and read the count value of the timing counter every 2.5s. The accuracy of the counting method is too low to f...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/481
Inventor 朱莲枝丰平于嘉茹严欣颖斯祝华
Owner BEIJING INST OF CONTROL ENG