Quantitative Investigation of Aircraft Rivet Alignment Behavior Using Smartphone-Based Acceleration Measurements

초록

Riveting is a critical fastening process in aircraft assembly, and the alignment of the rivet head andworkpiece directly affects the joint quality and structural reliability. However, rivet alignment remains heavilydependent on the experience of skilled workers and has rarely been quantified. In this study, rivet alignmentbehavior was quantitatively analyzed using smartphone-based acceleration sensors. Acceleration signals wereanalyzed in the time domain and numerically integrated to calculate velocity and displacement. The resultsshow that die alignment is an inherently dynamic process characterized by continuous low-amplitudevibrations in the horizontal and lateral directions, whereas the forming impact manifests as high-amplitude,short-duration acceleration peaks in the vertical direction. Alignment occurs under dynamic vibrationconditions of ±0.5 1.0 m/s² at approximately 5 Hz in the lateral direction. The estimated displacement during ––alignment was limited to ±0.2 0.3 mm, indicating that alignment is achieved through micro-motion rather thanmacroscopic repositioning. These findings explain why conventional rigid-position-controlled riveting systemsfrequently fail to replicate the precision of skilled human operations. By quantitatively identifying the dynamicfeatures associated with die alignment, this study provides fundamental physical data to support thedevelopment of riveting robots for aerospace manufacturing.

키워드