Linear motion system health monitoring method based on spatial domain information

Abstract

The invention discloses a linear motion system health monitoring method based on spatial domain information, and belongs to the field of electromechanical system health state monitoring. The method comprises the steps: measuring a spatial position signal of a linear motion system, and an electric signal for dragging an AC motor of the linear motion system; converting the electric signal based on the time domain into a space domain; calculating a local characteristic index of the local travel interval and a global characteristic index of the whole motion travel; judging whether the local feature indexes and the global feature indexes exceed corresponding set thresholds or not; if any index exceeds a set threshold value, determining that the linear motion system is in an abnormal state at the corresponding spatial position; and if not, determining that the motion travels of the linear motion system are all in a healthy state. According to the method, the measurement information based onthe time domain is converted into the space domain, the health state of the linear motion system on the whole motion stroke can be comprehensively and accurately reflected, the position where the abnormal state occurs is indicated, and the method has great application value for linear motion system full-stroke monitoring.

Description

technical field [0001] The invention belongs to the field of fault diagnosis of electromechanical equipment, and more specifically relates to a health monitoring method of a linear motion system based on spatial domain information. Background technique [0002] Linear motion systems are widely used in processing and manufacturing, medical instruments, textiles, packaging and port machinery and other fields. Health status monitoring of linear motion systems can obtain equipment health status, implement preventive maintenance, and reduce downtime. As a conversion device from electrical energy to mechanical energy, AC motors are widely used in various industrial categories. In the linear motion system, the output speed, torque and power of the motor drive the load mechanism to move, and the health status information of the load mechanism will be reflected on the electrical signal of the motor through the relationship between speed and / or torque and / or power. The linear motion...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a linear motion system health monitoring method based on spatial domain information. However, it cannot reflect the spatial location where the abnormal state occurs, leading to technical problems of inaccurate monitoring results

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