A kind of non-uniform structure vibration field engineering test method

Abstract

The invention relates to an engineering testing method of the vibration field of a non-uniform arrangement structure. Based on the condition number of a structural vibration modal matrix, vibration measuring points causing an increase of the condition number of the matrix are removed in the loop iteration process, so that reduction of the number of the measuring points and optimization of the positions of the measuring points are achieved. Then based on a mode superposition method, only measuring data of the optimized measuring points with the number reduced is adopted, and vibration field reconstruction of the whole large structure is achieved. According to the method, a few sensors are optimized for position arrangement, and the vibration response field of the whole structure is reconstructed by means of the measuring data of the sensors, so that space and weight are saved, the testing workload is significantly relieved, and a monitoring position optimization method is provided for avibration monitoring system.

Description

technical field [0001] The invention belongs to the technical field of vibration testing of large-scale structures in shipbuilding engineering, and in particular relates to an engineering testing method for vibration fields of non-uniformly distributed structures. Background technique [0002] The traditional method of vibration testing of large structures in ship engineering is to evenly arrange hundreds of sensors and their signal lines on the structure, and use the method of completely covering the sensors at all parts of the structure to achieve the purpose of measuring the vibration response of each part of the structure. This traditional method has a heavy workload for test preparation; testing the overall vibration of the structure also requires uniform arrangement of sensors at various positions on the structure, but it is difficult to arrange sensors in many positions due to factors such as equipment occupation and small space; a large number of sensors and signal li...

AI Technical Summary

Problems solved by technology

This traditional method has a heavy workload for test preparation; testing the overall vibration of the structure also requires uniform arrangement of sensors at various positions on the structure, but it is difficult to arrange sensors in many positions due to factors such as equipment occupation and small space; a large number of sensors and signal lines also increase the possibility Additional mass affecting the dynamic properties of the structure

If the sensor coverage density is reduced, too few sensors may lead to the risk of data deviation. Therefore, the traditional large-structure vibration test method is difficult to implement. Optimizing the number and arrangement of sensors is an important research direction to simplify engineering testing.

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