A two-step control assignment method for solid microthruster arrays

Abstract

The invention discloses a two-step control allocation method for a solid micro-thruster. The method comprises the steps that step one: area segmentation is performed on each solid micro-thruster arrayand the center of the area is seen as the action point of a pseudo thruster so as to establish a coarse allocation model; step two: coarse allocation is performed on the upper control force by usingthe coarse allocation model, the area requiring ignition is determined, then an allocation model is established for the elementary impulses in the ignition area to perform one time of fine allocation,and the control force demand is allocated to each elementary impulse; and step three: the allocation model is updated; the used elementary impulses are ensured not to be used in the next time of allocation; and if the elementary impulses or the ignition area are / is completely used, and the column of the corresponding efficiency matrix is enabled to be set as 0 so that updating of the allocation model can be completed. With application of the two-step allocation method, the problems that allocation to the elementary impulses of the micro-thruster array cannot be realized by the conventional planning method can be solved, and the practicality of the solid micro-thruster can be improved.

Description

technical field [0001] The invention belongs to the field of control distribution and relates to thrust distribution, in particular to a two-step control distribution method for solid micro-thruster arrays. Background technique [0002] In the traditional control system design, the control law and control allocation are generally combined, and the optimal design is carried out in an overall situation. However, as the actuators become more and more complex and the overdrive thruster configuration is widely used in spacecraft, the difficulty of global design increases rapidly. Aiming at the problem of control allocation under redundant actuators, the control allocation method can realize the optimal allocation of expected indicators, and then add additional performance indicators to the control system, improve the performance of the control system, and have a certain fault tolerance for actuator failures ability. The control distribution link can be designed separately from ...

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Problems solved by technology

[0006] The existing control distribution technology mainly adopts the modified pseudo-inverse and linear programming method. These two methods can handle the continuous limited thrust well, but for the actuators such as solid microthrusters that generate pulsed thrust, only the modified pseudo-inverse is used. Compared with the linear programming method, the thrust constraint cannot be well described, and the distribution results obtained are not optimal

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