Passive fault-tolerant control method for rigid body satellite attitude system based on adaptive pi control
An attitude system and fault-tolerant control technology, which is applied in attitude control, motor vehicles, space navigation equipment, etc., can solve the problem of the size of the gain without a perfect theoretical basis, unclear applicability of the satellite attitude control system, and in-depth research on the satellite attitude system And other issues
Active Publication Date: 2021-01-01
NANJING UNIV OF POSTS & TELECOMM
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[0004] However, it is well known that PI control suffers from three major drawbacks that limit its application in satellite attitude systems
[0005] First, so far, for the gain of the PI satellite attitude controller, most of them need to be determined by trial and error in engineering experiments, and there is no perfect theoretical basis to determine the size of the gain
[0006] Second, although PI control has shown good results when dealing with some linear time-invariant systems, its applicability to satellite attitude control systems is still unclear, and there is a lack of theory on the stability of closed-loop systems and various performances ensure
[0007] Third, the traditional constant gain PI satellite attitude control generally does not consider faults, and the research on the satellite attitude system is not in-depth
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[0081] The specific embodiment of the present invention will be further introduced in detail in conjunction with the accompanying drawings. In order for those skilled in the art to better understand the specific implementation steps of the present invention, the present invention also provides the simulation verification results of the passive fault-tolerant control of the rigid body satellite attitude system based on adaptive PI control using Matlab2014b software.
[0082] like figure 1 As shown, when the rigid satellite actuator failure occurs, in order to make the attitude control system achieve the desired attitude, under the framework of inversion control, two integral sliding modes are defined, and a PI control with adaptive gain is designed , its performance is better than the traditional constant gain PI control. This PI gain consists of two parts, one part is constant and the other part is time-varying. The constant part is flexibly determined by the designer, and t...
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The invention discloses a passive fault tolerance control method of rigid satellite attitude system p based on adaptive PI control. The method comprises steps of firstly, establishing an attitude kinetic model and a movement module of a rigidity satellite; establishing a mathematical model under the condition that a rigid satellite executor fails; and finally, under the framework of reversion control, designing a PI controller with adaptive gain. The PI gain consists of a constant part and a time-varying part. The constant part is flexibly determined by a designer. The time-varying part is automatically adjusted by an adaptive algorithm. In addition, the P-gain is in proportion to I-gain, and the method is not based on the independent traditional PI control, so the performance is better than that of traditional constant value gain PI control. According to the invention, the system is enabled to have the tolerance ability to faults, so stability of the system is ensured and the satellite is enabled to be quickly and accurately follow an expected attitude instruction.
Description
technical field [0001] The invention belongs to the field of satellite attitude control, in particular to a method for designing a passive fault-tolerant attitude controller of a rigid satellite based on self-adaptive PI. Background technique [0002] Satellites are usually used to complete various advanced space tasks, so the requirements for the safety, reliability and stability of satellites are particularly important. Due to the complexity of the mission, there are many challenges in the satellite attitude control system: Due to the influence of manufacturing level, cost and operating environment, satellites are more prone to unpredictable failures. Once a failure occurs, the satellite will reduce or even completely lose its intended function. For space planning, Economic, military, and even political can have serious ramifications. In the face of these challenges, in order to ensure the normal operation of the satellite, the attitude control system should be tolerant t...
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IPC IPC(8): G05D1/08
CPCB64G1/244
Inventor高志峰杨鹏蒋国平钱默抒许域菲林金星
OwnerNANJING UNIV OF POSTS & TELECOMM