Effects of Fasteners Damping on Dynamical Characteristics of Track Structure

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Liu, Yan-Qi^1 ; Song, Chun-Fang^2 ; Zhang, Yan^2 ; Xu, Longlong^2 ; Yang, Min^1 ; Zhang, Jing^1

Beijing Key Laboratory of Environment Noise and Vibration, Beijing Municipal Institute of Labor Protection, Beijing, China^1

School of Mechanical Engineering, Jiangnan University, Wuxi, China^2

关键词: Amplitude frequency response;    Dynamic characteristics;    Dynamical characteristics;    Excitation frequency;    Harmonic excitation;    High frequency bands;    Principle of superposition;    Theoretical expression;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/5/052030/pdf
DOI  :  10.1088/1757-899X/490/5/052030

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Track structure is modelled as an Euler beam that is supported by a series of discrete points. Further, the governing equations of the track structure subjected to moving harmonic excitation are established. On the basis of the dynamical characteristics and principle of superposition in frequency domain of periodic structure subjected to moving harmonic excitation, for any point, theoretical expression of the amplitude-frequency response is derived. Consequently, the nature characteristic and the effects of fasteners damping on dynamical characteristics of track structure subjected to moving harmonic excitation are investigated. The researches reveal that influences of damping on resonant peak bandwidth and peak value of the track structure are no obvious. While the effects of damping on dynamic response are very obvious on non-resonant high frequency band, and with the increasing of damping the dynamical responses of the track structure obviously decrease. The dynamic characteristics of the fastener bearing points and the midpoint on track structure are almost similarity, while there is a certain difference only in the frequency range far away from the excitation frequency.