Affiliations: [a] State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi ERC for NDT and Structural Integrity Evaluation, Xi’an Jiaotong University, Xi’an, China | [b] Xi’an Aerospace Propulsion Institute, Xi’an, China | [c] Zhengzhou University of Light Industry, Zhengzhou, China
Correspondence:
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Corresponding authors: Yong Li, State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi ERC for NDT and Structural Integrity Evaluation, Xi’an Jiaotong University, Xi’an 710049, China. E-mail: [email protected] and Zhenmao Chen, State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi ERC for NDT and Structural Integrity Evaluation, Xi’an Jiaotong University, Xi’an 710049, China. E-mail: [email protected]
Abstract: In this paper, inversion schemes for reconstruction of load and constraint of pipeline structure of a liquid rocket engine for global vibration evaluation of pipelines have been proposed and validated. The method involved modeling for forward simulation of random vibration and a multistep inversion scheme to reconstruct the unknown load and constraint parameters. In parallel, a piping structure vibration experimental system was also established to acquire the measured vibration signals for experimental validation of the numerical method. From both the numerical and experimental results, it was verified that a fine finite element model of a pipeline structure can be established based on the reconstructed load and constraint parameters which enabled a global vibration evaluation of the pipeline structure based on limited vibration information.
Keywords: Pipeline structure, reconstruction schemes, load and constraint, global vibration evaluation
