Method of Determining Brake Friction Coefficient Based on Wheel Side Force

A technology of friction coefficient and lateral friction, which is applied in the direction of aircraft component testing, electrical digital data processing, and special data processing applications, and can solve problems such as the inability to reasonably adjust the friction coefficient between tires and runway brakes

Active Publication Date: 2019-05-07
XIAN AVIATION BRAKE TECH
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Problems solved by technology

[0009] In order to overcome the problem that the existing technology cannot reasonably adjust the braking friction coefficient between the tire and the runway according to the difference in the lateral force received by the tire, the present invention proposes a method for determining the braking friction coefficient according to the lateral force of the wheel

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  • Method of Determining Brake Friction Coefficient Based on Wheel Side Force
  • Method of Determining Brake Friction Coefficient Based on Wheel Side Force
  • Method of Determining Brake Friction Coefficient Based on Wheel Side Force

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Embodiment 1

[0046] In this embodiment, when the aircraft speed is 120Km / H, and the pure radial load of the wheel is 6KN, the estimation method for determining the friction coefficient of the wheel braking is determined according to different wheel lateral forces, and the specific process is:

[0047] Step 1: Measure the brake friction coefficient μ(t) of the wheel under the condition of no lateral force.

[0048] Connect the wheel product to the landing gear of the aircraft according to the actual working conditions, and ensure that the specified radial load of 6KN is applied to the wheel. By dragging the wheel to rotate by the aircraft, keep the speed direction of the aircraft consistent with the rolling direction of the wheel. Control the brake pressure to gradually increase from zero, and at the same time control the thrust of the aircraft to maintain the forward speed of the aircraft V p It is always stable at 120km / H. Brake the wheel in this way until the wheel comes to a complete ...

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Abstract

Th present invention provides a method for determining a braking friction coefficient according to a wheel lateral force. The method comprises: by using a relational function mu(s) between a braking friction coefficient mu(t) of a wheel and a slip rate in a non-lateral-deviation state, obtaining a lateral force Fs(t) applied to a tire from the outside, and obtaining a lateral friction coefficient lambda(t) of a wheel at each moment in a braking process; and calculating a maximum lateral friction coefficient [lambda]p to obtain a real-time functional relationship between a braking friction coefficient [mu]s(t) and a tire slip rate s(t) when an airplane is subjected to a combined action of a lateral force and a braking force in an actual braking process. According to the method provided by the present invention, the problem that the braking friction coefficient cannot have a reasonable and accurate value because the braking friction coefficient [mu]s(t) of the wheel cannot correspond to the tire slip rate in a lateral force state can be avoided, and the anti-slip braking control characteristic and lateral slip characteristic of the airplane or motor vehicle can be modeled and simulated, and by comprehensively considering mutual influence and action between the lateral force and the braking force, ground maneuverability and maneuvering characteristics are studied and analyzed.

Description

technical field [0001] The invention relates to the technical field of brake system control, in particular to a method for determining the brake friction coefficient according to the wheel lateral force. Background technique [0002] The braking system of a common car or airplane not only has clear requirements on the braking distance and braking efficiency, but also must not allow the driver to lose control of the direction, which is crucial to the safety of the driver and the motor vehicle or airplane. Because during the braking process, the stress on the tire is very complex and changeable. In addition to the braking force required for braking, it is inevitable to bear a certain amount of lateral force to maintain control of the direction. In the middle, it will be subject to a large lateral force, which will affect the braking effect of the wheel, and will also cause the aircraft and motor vehicles to slip on the ground. Therefore, it is necessary to accurately measure a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50B64F5/60
CPCG06F30/15G06F30/20Y02T90/00
Inventor 张颖姝张谦
Owner XIAN AVIATION BRAKE TECH
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