Abstract
As the core power source of the hydraulic transmission system, hydraulic pump has been widely used in various industrial machinery and national defense equipment. It is of great significance to explore the monitoring of the health status of the hydraulic pump. It is also necessary to extract the effective components in condition monitoring of the hydraulic pump. In this work, based on fast empirical mode decomposition (FEMD) and relative entropy, a novel method is proposed for extracting the effective components of the signal. The original signal can be automatically separated by FEMD, and the useful components of the signal can be obtained via the measurement of relative entropy. Through the validation of the numerical experiment and measured data, the results indicate that the method presents good ability in the useful component extraction for signals with multi-frequency vibration. It provides an effective solution for the reduction of the interference of useless signals, including the direct current component and noise. The desired useful signals are also accurately reconstructed.
Highlights
Hydraulic pump is the essential power source of the hydraulic transmission system
The original signal can be automatically separated by fast empirical mode decomposition (FEMD), and the useful components of the signal can be obtained via the measurement of relative entropy
Through the validation of the numerical experiment and measured data, the results indicate that the method presents good ability in the useful component extraction for signals with multi-frequency vibration
Summary
Hydraulic pump is the essential power source of the hydraulic transmission system. Known as the “heart” of the hydraulic system, it has been widely used in machinery equipment of the diverse fields, including industry and national defense. Once the pump fails, it may lead to shutdown or affect product quality. Known as the “heart” of the hydraulic system, it has been widely used in machinery equipment of the diverse fields, including industry and national defense.. It may lead to shutdown or affect product quality. In the worst case scenario, it will paralyze the entire production line and cause huge economic losses, even disasters such as catastrophic crash, and serious social impact.. The hydraulic pump often confronts severe working conditions such as high pressure, high speed, high temperature, and heavy load.. The special working environment accelerates the deterioration of the health status.. It is vital to monitor the health status of the hydraulic pump. In consideration of condition monitoring, it is necessary to extract the valid components from the status signal
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