Good practices for designing and experimental testing of dynamically excited jointed structures: The Orion beam

Author(s)

Teloli, Rafael de O. ^[1] ; Butaud, Pauline ^[2] ; Chevallier, Gael ^[2] ; da Silva, Samuel ^[1]

Affiliation

^[1] Univ Estadual Paulista, Fac Engn Ilha Solteira, Dept Engn Mecan, UNESP, Av Brasil 56, BR-15385000 Ilha Solteira, SP - Brazil

^[2] Univ Bourgogne Franche Comte, Dept Appl Mech, CNRS UFC ENSMM UTBM, FEMTO ST Inst, 24 Chemin Epitaphe, F-25000 Besancon - France

• Document type: Journal article
• Source: MECHANICAL SYSTEMS AND SIGNAL PROCESSING; v. 163, JAN 15 2022.
• Web of Science Citations: 0

Abstract

This paper proposes a new lap-joint configuration, the so-called Orion beam. The new setup is composed of two thin beams connected by three bolted joints with contact patches on each connecting bolt. The Orion beam suggests an assembly configuration, in which there are bolts dedicated to ``static{''} functions to guarantee structural integrity and those that perform ``damping{''} functions to increase energy dissipation due to frictional contact. In particular, this paper analyzes the influence of the Orion beam's design in the repeatability of experimental measurements and the impact of the tightening torque and excitation amplitudes on the system's response. A feedback controller is proposed to control the excitation amplitudes during step-sine tests in the vicinity of resonance frequencies to measure the frequency response curves used to perform such analysis. Additionally, a single-degree-of-freedom Duffing-Van der Pol oscillator is proposed to evaluate, through its calibrated parameters, the impact of several tightening torque conditions and multiple excitation amplitudes on the structural stiffness and damping considering the vibration mode that promotes pronounced deformation around the lap-joint. Due to the presence of contact patches, the results show that the structure maintained impressive repeatability after several experimental measurements. Besides, it is possible to increase the damping for amplitude attenuation without significant losses in the contact stiffness. (AU)

• FAPESP's process: 19/19684-3 - Nonlinear structural health monitoring of structures assembled by bolted joints
• Grantee: Samuel da Silva
• Support type: Regular Research Grants
• FAPESP's process: 19/06540-3 - Experimental identification of nonlinear joints using frequency domain techniques
• Grantee: Rafael de Oliveira Teloli
• Support type: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 16/21973-5 - New contribuitions on the analysis and identification of hysteretic mechanical systems: applications on Bouc-Wen oscillator
• Grantee: Rafael de Oliveira Teloli
• Support type: Scholarships in Brazil - Doctorate (Direct)