A real-time identification method of external loads based on truncated response sparse decomposition

Abstract

The invention discloses an external load real-time identification method based on a truncated response sparse decomposition method, belonging to the field of external load identification, which solvesthe technical problem of long-time external load real-time identification. The method comprises the following steps: (1) adopting an accelerometer to pick up the dynamic response of a structure in real-time; (2) a finite element model being established according to the structural design parameters; (3) the modal parameters of the structure being obtained by a field test, the finite element modelbeing modified according to the measured modal parameters, and the frequencies and modes of the structure being calculated by the modified model; (4) real-time interception of response data by rectangular windows; (5) the truncated response sparse decomposition method being used to identify the external loads corresponding to the current rectangular window; (6) moving the rectangular window to intercept the new response data, and repeating the recognition process until the task is finished. The invention can realize the real-time identification of the long-time external load under the condition of the unknown initial condition.

Description

technical field [0001] The invention relates to the technical field of structural external load identification, in particular to a real-time external load identification method based on a truncated response sparse decomposition method. Background technique [0002] Accurate acquisition of structural external loads has basic practical value in the safety research of various projects (such as: aerospace, vehicle engineering, ship engineering, civil engineering, mechanical automation), and can provide structural design, monitoring, evaluation, maintenance, Control and reinforcement provide important reference information. Determining the external load includes direct measurement method and indirect measurement method, wherein the direct measurement method refers to directly measuring the magnitude of the contact force through various force sensors. However, due to factors such as the environment, measurement costs, and measurement equipment, many structural external loads are ...

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Problems solved by technology

However, this type of technology also has shortcomings. For example, because each fixed window is identifying the dynamic external load with known initial conditions, the recognition error from the front window will affect the recognition result of the rear window, and error accumulation is more likely to occur Phenomenon

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