Calculation and Test Correction Method of Plane Type Eddy Current Damping Coefficient

CHEN Zheng-qing, TIAN Jing-ying, HUANG Zhi-wen, WANG Jian-hui

China Journal of Highway and Transport ›› 2016, Vol. 29 ›› Issue (10) : 46-53.

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China Journal of Highway and Transport ›› 2016, Vol. 29 ›› Issue (10) : 46-53.

Calculation and Test Correction Method of Plane Type Eddy Current Damping Coefficient

  • CHEN Zheng-qing, TIAN Jing-ying, HUANG Zhi-wen, WANG Jian-hui
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Abstract

In order to obtain the calculation formula for a novel plane type eddy current damping (ECD), which can be used to suppress the vibration of large-scale engineering structure, theoretical analysis and tested experiments were carried out. First, a simplified formula was deduced based on the assumptions of uniform magnetic field and infinite plate length, and a correction factor of magnetic field intensity was introduced in consideration of the uneven magnetic field intensity and finite plate length in reality. Then, a single-degree-of-freedom portal frame was developed to test the ECD coefficients and its variations under different copper plate's thicknesses, distances between cooper plate and magnets, magnet spacings and the conditions whether there is an iron plate behind copper plate. The value of the correction factor of magnetic field intensity was recommended for realistic engineering applications. The results show that the ECD coefficient varies with distances between cooper plate and magnets as negative exponential function, and increases as copper plate's thickness increases; the maximum ECD coefficient can be achieved when magnet spacing is 60% to 80% of magnet width; if there is an iron plate behind the copper plate, the ECD coefficient is dramatically increased; the value ranges of the recommended value for magnetic field intensity correction coefficient are 0.58 to 0.67 and 0.77 to 0.93 for the condition with and without iron plate set behind the copper plate, larger value should be taken when copper plate is thinner, and smaller value should be taken when copper plate is thicker.

Key words

bridge engineering / eddy current damping / data fitting / plane type eddy current damping / damping coefficient

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CHEN Zheng-qing, TIAN Jing-ying, HUANG Zhi-wen, WANG Jian-hui. Calculation and Test Correction Method of Plane Type Eddy Current Damping Coefficient[J]. China Journal of Highway and Transport, 2016, 29(10): 46-53

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