Arrangement Method of Vibration Dampers Considering Frequency Response Physical Characteristics and Stiffness of Conductor

Abstract In order to study the calculation method of installation distance of vibration dampers with higher precision, so as to maximize its anti-vibration performance on the conductor. The arrangement method of dampers based on the frequency response characteristics of conductors is proposed, the dynamic model of conductor considering stiffness is established. The model is solved by finite difference method, the natural frequency and vibration mode of conductor in case of Aeolian vibration are obtained, and the wavelength of conductor vibration is obtained according to its mode, so as to calculate the installation distance of vibration dampers. The calculation results of the new method are compared with those of the traditional method, which proves the advantage of the new method in calculation accuracy. The new method has a good effect on improving the calculation accuracy of the installation distance of the vibration dampers on the conductors, which is greatly influenced by its stiffness. At the same time, the frequency response of the conductor should be considered as much as possible in the calculation of the installation distance of the damper.

Download Full-text

1250mm2 Conductor Self-Damping Characteristics

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.635-637.377 ◽

2014 ◽

Vol 635-637 ◽

pp. 377-380

Author(s):

Yi Qi ◽

Kuan Jun Zhu ◽

Sheng Chun Liu ◽

Bin Liu

Keyword(s):

Frequency Response ◽

Frequency Range ◽

Large Section ◽

Analytical Expression ◽

Response Characteristics ◽

Damping Characteristics ◽

Aeolian Vibration ◽

Round Wire ◽

Frequency Response Characteristics ◽

Comparison And Analysis

Self-damping test and analysis for five types of 1250mm2 large section conductor are performed, and analytical expression and frequency response characteristics are obtained. Comparison and analysis between round wire and formed wire 1250mm2 conductors are given. And the main protection frequency range of Aeolian vibration of 1250mm2 conductor is determined from 0 to 30 Hz.

Download Full-text

Dynamic Characteristics of Infants Riding on Stroller

Volume 7A: Dynamics, Vibration, and Control ◽

10.1115/imece2020-23749 ◽

2020 ◽

Author(s):

Hiroyuki Okajima ◽

Shinichiro Ota ◽

Ryo Ota

Keyword(s):

Frequency Response ◽

Transient Response ◽

Upper Limb ◽

Lower Limb ◽

Vibration Mode ◽

Vibration Characteristics ◽

Vibration Modes ◽

Response Characteristics ◽

Resonance Frequencies ◽

Frequency Response Characteristics

Abstract When a stroller with an infant ride over protrusions or irregularities, vibrations are transmitted from the infant’s lower limb to the upper limb through the tire-frame-cushion. To reduce the load on the infant, the challenge is to reduce the vibration at each part of the infant’s body. To design an equipment for reducing such vibration, it is important to understand the vibration characteristics of infants. Therefore, the purpose of this study was to clarify the vibration characteristics of infants. Transient and frequency response characteristics of the infant–stroller system were investigated by riding over protrusions and irregularities, respectively. In the transient response obtained by both wheels riding over the protrusion, the vibration of the head and chest is a mixture of the primary secondary vibration modes. In the transient response obtained with one wheel riding over the protrusion, the primary vibration mode becomes prominent when the vibration transmitted to the stroller seat is small, and the secondary vibration mode becomes prominent when the vibration transmitted to the stroller seat is large. The frequency response shows some resonance frequencies between 1 Hz and 6 Hz. Vibrations over 8 Hz have small effects on the infants because the acceleration ratio is low at values below 1.

Download Full-text