Open Access

ARTICLE

Distributed Dynamic Load in Structural Dynamics by the Impulse-Based Force Estimation Algorithm

Yuantian Qin^1,2, Yucheng Zhang^1,*, Vadim V. Silberschmidt²

1 College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
2 Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, LE11 3TU, UK

* Corresponding Author: Yucheng Zhang. Email:

Computer Modeling in Engineering & Sciences 2024, 139(3), 2865-2891. https://doi.org/10.32604/cmes.2024.046113

Received 19 September 2023; Accepted 28 December 2023; Issue published 11 March 2024

Abstract

This paper proposes a novel approach for identifying distributed dynamic loads in the time domain. Using polynomial and modal analysis, the load is transformed into modal space for coefficient identification. This allows the distributed dynamic load with a two-dimensional form in terms of time and space to be simultaneously identified in the form of modal force, thereby achieving dimensionality reduction. The Impulse-based Force Estimation Algorithm is proposed to identify dynamic loads in the time domain. Firstly, the algorithm establishes a recursion scheme based on convolution integral, enabling it to identify loads with a long history and rapidly changing forms over time. Secondly, the algorithm introduces moving mean and polynomial fitting to detrend, enhancing its applicability in load estimation. The aforementioned methodology successfully accomplishes the reconstruction of distributed, instead of centralized, dynamic loads on the continuum in the time domain by utilizing acceleration response. To validate the effectiveness of the method, computational and experimental verification were conducted.

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Keywords

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