Vibration Performance Analysis of FR Vibration Damper Using Finite Elements Method

2010 ◽  
Vol 44-47 ◽  
pp. 1268-1272 ◽  
Author(s):  
Xiao Yu Luo ◽  
Yi Sheng Zhang ◽  
Yong Ping Zheng
Keyword(s):  
Transmission Lines ◽  
Mechanical Vibration ◽  
Vibration Energy ◽  
The Finite Element Method ◽  
Vibration Damper ◽  
Harmonic Response ◽  
Overhead Transmission Lines ◽  
Design And Manufacturing ◽  
Work Done ◽  
Vibration Performance

FR vibration damper is widely used in overhead transmission lines to prevent aerolian vibration. In this paper, the vibration characteristics of the damper are analyzed. The finite element method software ANSYS was applied to investigate the modal, harmonic response and PSD of the damper based on the theory of mechanical vibration and dynamic analysis. The results prove that the FR vibration damper performs well in consuming the vibration energy of the transmission lines. Work done in this paper provides a new way based on numerical simulation in design and manufacturing of vibration damper, and has laid a foundation for further study of vibration damper.

Analysis of 50Hz Electric Fields Generated by Multi-Circuit Transmission Lines on the Same Tower

2014 ◽  
Vol 700 ◽  
pp. 67-70 ◽  
Author(s):  
Bin Liu ◽  
Tao Wang ◽  
Fei Gu ◽  
Jie Wei ◽  
Hong Wei Cui ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Transmission Lines ◽  
The Finite Element Method ◽  
Protection Measures ◽  
Overhead Transmission Lines ◽  
Domestic Security ◽  
Phase Sequence ◽  
The Cross ◽  
Security Standards

The finite element method has been applied to calculate the 50Hz electric fields nearby the transmission lines. The electric field strengths nearby multi-circuit transmission lines on the same tower under different arrangement of phase sequence, nearby the cross-arm are calculated. According to the foreign and domestic security standards of 50Hz electric field, the impacts of overhead transmission lines on environment are evaluated and the adoptable measures to reduce electric field strength are proposed. Meanwhile the distributing pattern of the electric field nearby the cross-arm is analyzed and proposals for further protection measures during maintenance operation are provided.

Nonlinear Revision of the Linear Model for Stockbridge Vibration Damper and Experiment Validation

2013 ◽  
Vol 328 ◽  
pp. 504-508 ◽  
Author(s):  
Xiao Yu Luo ◽  
Yi Sheng Zhang ◽  
Yong Ping Zheng
Keyword(s):  
Linear Model ◽  
Transmission Lines ◽  
Vibration Velocity ◽  
Analytic Model ◽  
Vibration Damper ◽  
Steel Cable ◽  
Overhead Transmission Lines ◽  
The Past ◽  
Experiment Validation ◽  
Set Up

Stockbridge vibration damper is widely used in overhead transmission lines to alleviate the wind-induced aeoline vibration. In the past few decades, linear analytic model had been developed to interpret characteristics of the vibration damper. However, nonlinear vibration characteristics of the damper have rarely been studied theoretically. In this paper, experiment was set up to reveal the nonlinearity during the vibration of the Stockbridge vibration damper. Then the linear model was revised by considering the supporting part of the strand steel cable as elastic foundation. This makes the length of the cable a variable depending on the deflection of the cable, which is affected by the vibration velocity. Results obtained from the nonlinear revised model compare better with experiment than those from linear model.

scholarly journals Nonlinear Dynamic Analysis of High-Voltage Overhead Transmission Lines

2018 ◽  
Vol 2018 ◽  
pp. 1-35 ◽  
Author(s):  
Meng Zhang ◽  
Guifeng Zhao ◽  
Jie Li
Keyword(s):  
Transmission Line ◽  
Nonlinear Vibration ◽  
Transmission Lines ◽  
Internal Resonance ◽  
Nonlinear Dynamic Analysis ◽  
Primary Resonance ◽  
Vibration Energy ◽  
Overhead Transmission Lines ◽  
Out Of Plane ◽  
Plane Direction

According to a generalized Hamilton’s principle, three-dimensional (3D) nonlinear vibration equations for overhead transmission lines that consider geometric nonlinearity are established. Based on the characteristics of an actual transmission line, the 3D equations are simplified to two-dimensional equations, and the nonlinear vibration behavior of transmission lines is investigated by combining theoretical analysis with numerical simulation. The results show that transmission lines have inherently nonlinear vibration characteristics. When in free vibration, a transmission line can undergo nonlinear internal resonance, even when its initial out-of-plane energy is relatively low; as its initial out-of-plane energy increases, the coupling of in-plane and out-of-plane vibration becomes stronger. When forced to vibrate by an external excitation, due to the combined action of internal and primary resonance, the vibration energy of a transmission line transfers from the out-of-plane direction to the in-plane direction that is not directly under the excitation, resulting in an increase in the dynamic tension and the displacement amplitude of the transmission line. Increasing damping can consume the vibration energy of a transmission line but cannot prevent the occurrence of internal resonance.

scholarly journals Vibration Characteristics of Quartz Crystal and Analysis of System Error in Fiber Optic Voltage Sensor

2020 ◽  
Vol 8 ◽  
Author(s):  
Hanrui Yang ◽  
Yichang Guo ◽  
Shibo Xu ◽  
Linlin Xia ◽  
Wei Hong ◽  
...  
Keyword(s):  
Quartz Crystal ◽  
Fiber Optic ◽  
Mechanical Vibration ◽  
Axial Direction ◽  
Voltage Sensor ◽  
The Finite Element Method ◽  
System Error ◽  
Vibration Stress ◽  
System Output ◽  
Vibration Performance

The additional deformation of the quartz crystal under the vibration stress disturbance greatly affects the measurement accuracy of the fiber optic voltage sensor. In this paper, the influence of different vibration directions on quartz crystal deformation is analyzed by the finite element method based on the analysis and derivation of the system error mathematical model of the quasi-reciprocal reflected fiber optic voltage sensor. Furthermore, the effect of additional quartz crystal deformation on the output precision of the system is calculated. The results show that the vibration stress along the axial direction mainly causes the quartz crystal to deform in height, and the vibration stress along the radial direction mainly causes the quartz crystal to deform the circumference. Among them, the deformation of the crystal radial circumference is the main reason to influence the system output accuracy. In addition, the size and deformation parameters of the quartz crystal are related to the output error of the sensor system. This paper provides the parameter optimization and design guidance for improving the anti-mechanical vibration performance of the sensor head of the fiber optic voltage sensor and provides a theoretical basis for the suppression method of the system error.

Modeling of overhead transmission lines for trapped charge discharge rate studies

2021 ◽  
Vol 198 ◽  
pp. 107343
Author(s):  
J. Morales ◽  
J. Mahseredjian ◽  
I. Kocar ◽  
H. Xue ◽  
A. Daneshpooy
Keyword(s):  
Transmission Lines ◽  
Discharge Rate ◽  
Overhead Transmission Lines ◽  
Charge Discharge ◽  
Trapped Charge
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