Method for evaluating health conditions of various components of gearbox
A state-of-health, gear box technology, applied in the testing of mechanical components, testing of machine/structural components, and testing of machine gears/transmission mechanisms, etc., can solve problems such as easy failure and damage, complex structure, etc.
Active Publication Date: 2016-07-13
AVIC SHANGHAI AERONAUTICAL MEASUREMENT CONTROLLING RES INST
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[0002] Gearboxes are key transmission components of aircraft and vehicles. They have complex structures and are exposed to high-speed, alternating and heavy-loaded harsh environments for a long time. Due to their non-redundant design, they are prone to failure and damage. Their health status is directly related to the safe operation and life safety of drivers
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[0031] The present invention will be further described in detail below with reference to the drawings and embodiments.
[0032] Such as Figure 5 As shown, a method of the present invention for evaluating the health status of various parts of the gearbox includes the following steps:
[0033] Step 1: X is the characteristic parameter sample data of a certain part of the gearbox in the normal state, which is an n×m matrix, where m is the number of characteristic parameters related to the state of the part, and n is the sample size. Calculate the mean value of each column of the characteristic parameter sample data μ j And standard deviation σ j , The calculation formula is: According to the mean μ j And standard deviation σ j Standardize X, the calculation formula is Obtain the standardized characteristic parameter sample data X′ in the normal state, where x′ ij Is the element in the ith row of the jth column of X'. Calculate the covariance matrix R of the characteristic paramete...
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The invention discloses a method for evaluating health conditions of various components of a gearbox. The method comprises the steps of for a certain component of a gearbox, selecting feature parameter sample data X associated with the component at a normal condition, and solving for a mean value <mu>j, a standard deviation <sigma>, a covariance matrix R and a normalized function parameter a by using the feature parameter sample data; and for feature parameter measured data Y monitored in real time, standardizing the feature parameter measured data by using the mean value <mu>j and the standard deviation <sigma>, calculating a Mahalanobis distance D of the standardized feature parameter measured data Y', and mapping the Mahalanobis distance D as a health degree value HI through a normalized function by using the normalized function parameter a. The invention can obtain performance and health degradation condition indexes of the various components in the operation process of the gearbox, and thus determines the health conditions of the various components of the gearbox.
Description
Technical field [0001] The invention belongs to the field of health assessment, and specifically relates to a method applied to the health assessment of gearbox components. Background technique [0002] Gearboxes are key transmission components such as airplanes and vehicles. They have complex structures and have been exposed to high-speed, alternating and heavy-duty environments for a long time. Because of their non-redundant design, they are prone to failure and damage. Their health is directly related to airplanes and vehicles. Safe operation and the life safety of drivers. Therefore, in order to improve the safety of aircraft and vehicles and prevent accidents, it is necessary to evaluate the health of the gearbox. [0003] Generally, most of the failures of the various parts of the gearbox do not occur suddenly, but undergo a gradual degradation process during use, until they fail or are planned to be replaced. If the state indicators that can indicate the performance and he...
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CPCG01M13/021
Inventor 单添敏郑国王景霖何召华林泽力曹亮马振国
Owner AVIC SHANGHAI AERONAUTICAL MEASUREMENT CONTROLLING RES INST