Effect of Load Frequency on Dynamic Similitude of Scaled Model

Abstract:

The similitude requirement of excited load was deduced to maintain the consistent vibration between scaled model and prototype structure, based on the modal theory of multi-DOFs systems. The similitude of load frequency was another demand to maintain the consistent vibration, with the similitude of structure size and load magnitude. The dynamic similitude problem of a liquid tank was studied by finite element method and test analysis respectively. The results show that the similitude of load frequency is the insurance for the consistency of prototype and scaled model structures vibration. In a case the magnitude error of displacement is 8% to 10%, and the displacement and acceleration have all changed distinctly without the similitude of load frequency. All the results indicate that the similitude of load frequency is the key factor to analyze the scaled model dynamics correctly.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 3508-3513
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.3508
• Online since: October 2013
• Authors: Yu Chao Song*, Yan Nian Cai, Chao Ming Huang, Hong Liang Yu
• Keywords: Excited Frequency, Finite Element Method (FEM), Scaled Model, Similitude, Test

References

[1] Xiaoci Zhang. Scaling law for experiment of underwater explosion with several independent geometrical scales[J]. Journal of Ship Mechanics, 2008, 12(3): 490-499.

[2] Qiang Wei, Yuanying Qiu, Baoyan Duan. Wind induced vibration analysis of a 50 meter scaled model of large radio telescope. Chinese Journal of Applied Mechanics. Vol. 20(2003), pp.59-63. (In chinese).

[3] Yong Chen, Z.P. Tong, H.X. Hua, et al. Experim -ental investigation on the dynamic response of scaled ship model with rubber sandwich coatings subjected to underwater explosion[J]. International Journal of Impact Engineering, 2009, 36: 318-328.

DOI: 10.1016/j.ijimpeng.2007.12.015

[4] Tong Zhu, Jing Zhou, Gao Lin, etc. Research on dynamic structural model tests of chimneys. World Earthquake Engineering. Vol. 23(2007), pp.113-119. (In chinese).

[5] Jiaru Qian, Zuozhou Zhao, An Duan, etc. Pseudo-dynamic tests of a 1: 10 model of pr e-stressed concrete containment vessel for CNP1000 nuclear power plant. China Civil Engineering Journal. Vol. 40(2007), pp.7-13. (In chinese).

[6] Tong Zhu. The research on similitude problem of structural dynamic models and technology of structural dynamic tests. Dalian: Dalian University of Technology, 2004. (In chinese).

[7] Xudong Yang. The studying of some problems in shaking table model test. Beijing: China Architecture Design & Research Group, 2005. (In chinese).