Application of PSO in frequency-based tension identification of hanger rods with two fixed ends

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (9) : 196-201.

LI Rui1 LI Xiaozhang1 ZHENG Xianglong2 ZHOU Yitang1

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Abstract

The Frequency method is widely used to measure tension of hanger rods in arch bridges. But, the traditional frequency method ignores the effects of bending stiffness. When it is used to calculate tensions of hanger rods with two fixed ends, the calculation error is too large to meet requirements of engineering accuracy. Here, the frequency equation of a hanger rod with two fixed ends was deduced with its dynamic equation. Then the particle swarm optimization (PSO) method was adopted to solve this transcendental frequency equation. Finally, two order natural frequencies measured of the hanger rod were employed to realize accurate recognition of tension and bending stiffness of the hanger rod. Through identifying tension of a virtual hanger rod and error analysis, the recognition accuracy of the proposed method was verified. Through identifying tension of an actual hanger rod, the engineering feasibility of the proposed method was verified.

Key words

particle swarm optimization (PSO)

/ tension identification / hanger rod with two fixed ends / frequency

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LI Rui1 LI Xiaozhang1 ZHENG Xianglong2 ZHOU Yitang1 . Application of PSO in frequency-based tension identification of hanger rods with two fixed ends[J]. Journal of Vibration and Shock, 2018, 37(9): 196-201

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