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Analysis of Dynamic Force Error in Fatigue Testing under Nonlinear Mechanical Model Based on Finite Element Numerical Simulation

Author(s)

Yu Wu, YingWu*

Affiliation(s)

Chongqing Academy of Metrology and Quality Inspection, Chongqing, China *Corresponding Author

Abstract

This article summarizes the problems existing in multi degree of freedom linear vibration systems and finds that it is necessary to consider the influence of structural nonlinear sources on measurement results in some cases. Therefore, the perturbation method is used to theoretically analyze the nonlinear response caused by subharmonics under nonlinear characteristics. The influence of even and odd harmonics on displacement waveforms is theoretically derived. At the same time, finite element numerical simulation method is used to analyze the transient response of a two degree of freedom nonlinear stiffness spring mass vibration system. It is found that nonlinear sources will cause high-frequency vibration of subharmonics in the vibration system and have a more significant impact on acceleration measurement results. This situation will have an impact on the process of correcting dynamic force measurement errors using the A1.4 accelerometer method according to ASTM E467-2008D.

Keywords

Finite Element; Nonlinear; Dynamic Force; Fatigue Testing Machine

References

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