Automated Calibration System and Method for Structural Modal Testing

DOI: https://doi.org/10.62517/jes.202502427

Author(s)

Hao Hou1, Haolin Sun2,*, Rilong Li1

Affiliation(s)

¹ Beijing Great Wall Metrology & Test Technology Institute, AVIC, Beijing, China ² School of Mechatronical Engineering of Beijing Institute of Technology, Beijing, China *Corresponding Author

Abstract

This study tackles key issues in current structural modal testing system calibration, like scattered modular operations, complex manual integration, and lack of system-level performance assessment. We developed an automated calibration system and method. Using an innovative "parameter-driven, full-process coordination, system-level closed-loop" design, the system integrates five key modules: intelligent fitting of standard modal components, precision automation assembly, dynamic optimization of impact hammer parameters, precision positioning module for laser vibrometry, and system-level feedback verification. It automates the entire calibration process for modal testing systems, including sensors, data acquisition devices, and analysis software. Experiments show the device fully meets the calibration needs of plate and shell structures (such as skins, ribs, and doors). Overall calibration success rate, efficiency, and accuracy significantly surpass traditional methods: system-level calibration accuracy improved by 35.7%, modal frequency error reduced from ±41.7Hz to ±0.97Hz; calibration efficiency increased by 68.2%, cutting single system calibration time from about 47 minutes to under 15 minutes; success rate reached 98.6%, far above the traditional 72.3%. The device complies with Civil Aircraft Structural Modal Testing Standards (AC-21-101) and has been successfully applied in aircraft vibration testing, providing reliable technical support for aerospace structural modal testing.

Keywords

Structural Modal Testing; Automated Calibration; System-level Closed-Loop; Impact Hammer Parameter Optimization; Laser Vibrometry

References

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