Aircraft anti-skid brake control method

An aircraft and braking system technology, applied in the field of automatic brake control, can solve the problems of deep slippage of the system and unhelpful braking, and achieve the effect of taking into account the efficiency of anti-skid braking and the safety of anti-lock braking

Inactive Publication Date: 2014-02-05
渭南高新区晨星专利技术咨询有限公司
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Problems solved by technology

[0007] In response to these problems, the present invention will adopt the following methods to improve this problem: the first method is to carry out online identification of the longitudinal dynamics process of the aircraft through neural networks, construct the longitudinal sliding dynamics process, and then control the aircraft through the adaptive neural network. To ensure that the braking system can track the set slip rate in the presence of vertical and longitudinal uncertainties. Considering the physical constraints of the braking torque input, excessive braking torque will not help the braking, but will easily cause the system to fall into deep skid , the invention performs constraint processing on the control input, so that the controller can learn the uncertain part and track the set slip curve under the input constraint situation

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  • Aircraft anti-skid brake control method

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Embodiment Construction

[0193]In order to verify the validity and robustness of the previous design algorithm, the present invention considers two working conditions: one is that the interference caused by the vibration of the landing gear to the friction identification of the braking system is not considered; the other is that the landing gear is a spring Damping systems, or periodic vertical loads to the wheels. The torque input is constrained in the neighborhood in here choose for simulation. The present invention discusses two cases, the reference model parameters are set at ω n =10rad / s and ζ n =1. The optimal slip ratios of the aircraft on the dry runway and wet runway are 0.16 and 0.14 respectively;

[0194] First discuss the case of no periodic vertical load on the landing gear, from image 3 It can be observed that through the online identification at the initial stage, the operating point of the system can be maintained near the optimal slip rate λ=0.14. Near the new optimal slip...

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Abstract

The invention relates to an aircraft anti-skid brake control method. According to the aircraft anti-skid brake control method, an aircraft reduction rate signal is constructed by means of the robustness and anti-interference characteristics of a tracking differentiator or a second-order sliding mode differentiator, and is used for calculating slip force, and learning identification in a longitudinal dynamics process is avoided. According to the method, braking longitudinal force does not need to be assumed to be uniformly distributed, and the method can be used for a multi-wheel brake system. In addition, a safety operation range of the brake system is considered, the brake pressure is constrained, the anti-skid brake efficiency and anti-lock safety are considered simultaneously, and the method has certain advancement.

Description

technical field [0001] The invention relates to an aircraft anti-skid brake control method, which belongs to the technical field of brake automatic control. Background technique [0002] The landing gear-braking system is a subsystem with relatively independent functions on the aircraft. Its function is to bear the static weight of the aircraft, dynamic impact load and absorb the kinetic energy of the aircraft when it lands, so as to realize the landing, taxiing and turning control of the aircraft. Modern aircraft are generally equipped with anti-skid brake system (Anti-skid Brake System, ABS), which uses a closed-loop control method to automatically adjust the braking torque on the basis of the traditional braking system to prevent the aircraft wheel from being damaged due to excessive braking pressure during braking. lockout. It can make full use of the maximum combination coefficient between the aircraft tires and the ground to obtain higher braking efficiency, thereby e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64C25/42B60T8/32B60T8/56
Inventor 不公告发明人
Owner 渭南高新区晨星专利技术咨询有限公司
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