发表机构
TH Wildau; TU Dresden（维尔道应用技术大学; 德累斯顿工业大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出一种基于全场激光多普勒测振法的四螺栓板螺栓松动筛查流程，结合全局FRF相关性与局部FRAC图谱，无需训练分类器即可区分不同程度的FRF失真与空间变化。
AI 中文摘要
全场激光多普勒测振法（LDV）可揭示螺栓扭矩损失如何在整个结构上重新分布频响函数（FRF），而非仅在少数传感器位置。本研究提出一种四螺栓铝板的筛查流程，采用扫描得到的H1 FRF的逐点幅值与相位输出。从全紧固状态的空间均方根（RMS）频谱中选取候选共振峰，并在四个单螺栓0 Nm工况中对其进行追踪。七个基线响应在规定的组特定搜索窗口内保持可追踪，被保留为实验共振组RG1-RG7；每个测量频率均对应报告了无量纲板频率系数。全局变化通过仅幅值及保留相位的复模态保证差异进行量化，局部变化则采用匹配窗口的FRAC缺失图谱与归一化热点面积分数进行评估。保留的组分为低、中、高失真响应，局部图谱可区分紧凑的接头中心变化与分布式FRF重新分布。该工作流程因此将全局FRF失真与空间分辨的解释关联起来，且不依赖训练好的分类器或样本特定的节点标签。
英文摘要
Full-field laser Doppler vibrometry (LDV) can reveal how bolt torque loss redistributes a frequency response function (FRF) over an entire structure rather than only at a few sensor positions. This work presents a screening procedure for a four-bolt aluminum plate using pointwise amplitude and phase exports of scanned H1 FRFs. Candidate resonances were selected from the all-tight spatial RMS spectrum and tracked in four single-bolt 0 Nm cases. Seven baseline responses remained trackable within prescribed group-specific search windows and were retained as experimental resonance groups RG1-RG7; a dimensionless plate-frequency coefficient was reported alongside each measured frequency. Global changes were quantified using amplitude-only and complex, phase-retaining modal-assurance dissimilarities, and local changes were evaluated using matched-window FRAC-deficit maps and a normalized hotspot-area fraction. The retained groups separate into low-, intermediate-, and high-distortion responses, while the local maps distinguish compact joint-centered changes from distributed FRF redistribution. The workflow therefore links global FRF distortion with spatially resolved interpretation without relying on a trained classifier or specimen-specific node labels.
