Partial least squares-based vibration response frequency domain forecasting method and device

Abstract

The invention provides a forecasting method and device of frequency domain vibration responses of multiple points based on partial least squares under a condition of an unknown multi-source load. Themethod comprises the following steps: by taking a frequency domain vibration response of a known measuring point as an input and taking frequency domain vibration responses of a plurality of unknown measuring points as outputs, training a partial least squares model by using historical data; and under a working condition that a multi-source load is unknown, by taking the frequency domain vibrationresponse of the known measuring point as an input of the trained partial least squares model, performing outputting to realize the forecasting of the frequency domain vibration responses of the plurality of unknown measuring points. The device comprises a plurality of vibration sources and a plurality of vibration response sensors; the plurality of vibration sources generate uncorrelated steady random excitations; the vibration sensors are fixedly arranged on a structure and record vibrations of the structure. The forecasting method and device have the advantage that the forecasting of the frequency domain vibration responses of the plurality of measuring points under the working condition that the multi-source load is unknown is realized.

Description

technical field [0001] The invention relates to the field of frequency-domain vibration response prediction under uncorrelated multi-source load unknown, in particular to a vibration response frequency-domain prediction method and device based on partial least squares under uncorrelated multi-source load unknown. Background technique [0002] With the development and progress of industry and control technology, engineering structures in the fields of aerospace, ships, large machinery, and bridges have become more and more complex, large-scale, and intelligent. Vibration is a design factor that has to be considered in mechanical design and navigation and aerospace engineering, especially in design and use, mechanical damage caused by excessive vibration response, bridge collapse, and navigation and aerospace accidents are common. However, the vibration response of some nodes under some working conditions cannot be directly measured, which makes the control and damping design ...

AI Technical Summary

Problems solved by technology

[0004] One is that for complex engineering structures, it is not easy to model the system and obtain the transfer function; the other is that in many cases, the load conditions of the structure cannot be directly measured, such as missiles flying in the air, ocean platforms It is difficult to directly measure or calculate the external load acting on the structure when large buildings are affected by wind, waves and traffic excitation, and sometimes the dynamic load cannot be measured because the load point is not accessible.

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