Vibration sensor placement optimization method based on complex network theory

Abstract

The invention provides a vibration sensor arrangement optimization method based on the complex network theory. Firstly, the method divides a virtual mesh on the equipment surface to be arranged with the sensor, and carries out vibration scanning measurement according to the nodes of the mesh. Then the time-domain and frequency-domain signal characteristic indices of the vibration scanning data areextracted, and the principal component analysis method is used to reduce the dimension of the signal feature set. The scanned points are used as the nodes of the network, and the weights of the connecting edges are obtained based on canonical correlation analysis, and the complex network model of the equipment surface vibration is established by using threshold method. Finally, by calculating thecharacteristic index of the network model, the community analysis is carried out, and the center node of the network community is used as the sensor measurement point. Based on the vibration laser scanning means, the invention proceeds from the criterion of evaluating the similarity of the sensor signal and combines the complex network theory to carry out comprehensive evaluation on the measuringpoint signal, thereby determining the optimal measuring point of the sensor.

Description

technical field [0001] The invention belongs to the field of vibration state monitoring and diagnosis of mechanical equipment, and in particular relates to a method for optimizing the layout of vibration sensors on the surface of mechanical equipment based on complex network theory. Background technique [0002] There are many internal vibration excitation sources in complex mechanical equipment such as internal combustion engines and gearboxes. Different excitation sources form different vibration transmission paths through their complex mechanical structures. Therefore, such mechanical equipment exhibits complex mechanical vibration characteristics. When monitoring and diagnosing the vibration state of such equipment, due to its compact internal structure, the locations available for placing sensors are very limited. Quantity and specific location are the primary issues in mechanical equipment vibration monitoring. If too many sensors are installed and arranged, not only ...

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Problems solved by technology

These methods rely on the finite element modal calculation or experimental modal results of the analyzed object, and require a large amount of measuring point data for support, but the obtained results are only theoretically optimal. This method is still suitable for objects with static and relatively simple structures. More effective, but for devices with complex structures and dynamic characteristics, the effect is not good because accurate modal information cannot be obtained

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