Dynamic Modeling of Bolted-joint Interface and Radiated Noise Reduction for Cover Plate

doi:10.3901/JME.2025.17.161

Abstract

Abstract: An engineering issue concerning the substantial performance discrepancy resulting from the linear simulation of the bolted joint interface for cover plate has been addressed. This has been achieved through the integration of finite element modal analysis, experimental modal analysis, and integrated optimization. A novel virtual material layer block modeling and parameter identification technique has been developed, which is tailored to the structural characteristics of cover plate. Additionally, a noise evaluation method has been introduced to facilitate structural design optimization. In response to the non-uniform stiffness distribution of the bolted joint interfaces, an enhanced virtual material layer method has been developed. This method involves the subdivision of the virtual material layer and utilization of surrogate model. The optimization objective is to minimize the average deviation between finite element modal values and experimental modal values, thereby improving the accuracy of the modeling. The optimization focuses on minimizing the maximum equivalent radiated acoustic power within concerned frequency band. This is achieved by ensuring that the multi-order modes in the low-frequency range meet the set value as a constraint. The volume fraction of stiffeners is controlled to preserve a lightweight design. Furthermore, based on manufacturability considerations, topology optimization of cover plate has been conducted. Refining the reinforcement structure based on topology optimization results, a noise reduction has been confirmed through virtual validation and experimental confirmation. The results indicate that the enhanced virtual material layer method has reduced the average deviation of the first six orders of modal frequencies, from 4.29% to 0.12%. Post-optimization, the radiated noise within the frequency band of 1 400-2 200 Hz has been favorably impacted, confirming the efficacy of the developed optimization approach.

Key words: bolted interface, virtual material layer, surrogate model, topology optimization, radiated noise

CLC Number:

U463
TH122

SU Yonglei, ZHANG Zhifei. Dynamic Modeling of Bolted-joint Interface and Radiated Noise Reduction for Cover Plate[J]. Journal of Mechanical Engineering, 2025, 61(17): 161-170.

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