An aircraft landing gear health monitoring method
A technology for aircraft landing gear and health monitoring, applied in aircraft component testing, special data processing applications, instruments, etc., can solve problems such as time-consuming, cumbersome, and high theoretical requirements for physical and mathematical models, achieving high accuracy and easy monitoring , the effect of high engineering application value
Active Publication Date: 2019-05-03
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
For the determination of parameters, including the failure mode effect analysis (Failure Modes, Mechanisms, and Effects Analysis, FMMEA) method, the principle of this method is simple and clear and easy to master, but it is cumbersome and time-consuming; the method based on the model, but this method For complex systems, the theoretical requirements for establishing physical and mathematical models are high, and there are few researches at home and abroad
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[0048] see figure 1 — Figure 9 ,
[0049] The parameter model reflecting the inherent characteristics of the system described in the present invention is expressed as a transfer function of the main hydraulic pressure and the displacement of the actuating cylinder of the landing gear in the landing gear retracting system. The main hydraulic pressure and the over-damping coefficient affect the variation of the displacement response of the system. Applying the theoretical knowledge of the control system, in the overdamped state, the movement of the displacement with time when the landing gear is retracted is uniquely determined by the system transfer function. The landing gear retracting time and lowering time can directly reflect whether the overall displacement state of the landing gear is healthy or not. Therefore, the landing gear retraction time and downtime are determined as the characteristic parameters of the health state of the landing gear.
[0050] The invention ...
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The invention relates to an aircraft landing gear health monitoring method, which comprises the following steps of: establishing a system physical mathematical model by applying theoretical knowledgeof a control system, finding out a reason influencing the health state of the system through mechanism analysis, and verifying factors influencing the health state of a landing gear and parameters reflecting the health state through model simulation analysis. The health monitoring parameters selected by the method are as follows: the landing gear retraction time is obtained by a model-based method, the accuracy is high, the monitoring is easy, and the engineering application value is very high.
Description
technical field [0001] The invention belongs to the field of aircraft health monitoring, in particular to a method for monitoring the health of aircraft landing gear. Background technique [0002] In order to achieve active maintenance of equipment in health monitoring, it is necessary to fully understand and grasp the equipment performance and health degradation trends, and to grasp the health status information of equipment in real time. If the status indicators that can indicate the performance and health degradation of the equipment can be detected or measured during the operation of the equipment, the maintenance of the equipment can be organized in a targeted manner to prevent the occurrence of abnormal failure of the equipment. Although the health monitoring and forecasting system has gradually begun to be applied, there is still a certain gap from engineering practicality. [0003] There are two methods currently used for aircraft health monitoring. One is based on ...
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IPC IPC(8): G06F17/50B64F5/60
Inventor 郭一涵董旭马存宝佘智宇王家立
Owner NORTHWESTERN POLYTECHNICAL UNIV