Dynamic Characteristics Analysis of Two Adjacent Transmission Towers

Suspended Cables ◽

Analysis Models ◽

Dynamic analysis models of two adjacent transmission towers, two adjacent corner towers and the correspond single-tower are established, its dynamic characteristics are analyzed and compared. The results showed that: Dynamic characteristics of two adjacent transmission towers are close, but the towers connected with the corner tower changes much. Compared with the single-tower, its dynamic characteristics have changed regardless of corner tower or straight line transmission towers. It is also shown that suspended cables not only have mass effects, but have coupled stiffness effects applied to towers on transverse direction and longitudinal direction.

Dynamic Characteristics Analysis of Two Adjacent Transmission Towers

Advanced Materials Research ◽

10.4028/scientific5/amr.446-449.833 ◽

2012 ◽

Vol 446-449 ◽

pp. 833-836

Author(s):

Xiang Mei Yan

Keyword(s):

Dynamic Characteristics ◽

Transmission Towers ◽

Dynamic Characteristics Analysis of an Escalator Using the Computational Dynamics Program

Volume 1A: 25th Biennial Mechanisms Conference ◽

10.1115/detc98/mech-5813 ◽

1998 ◽

Author(s):

Yi Sug Kwon ◽

Chan Jong Park

Keyword(s):

Dynamic Analysis ◽

Dynamic Characteristics ◽

Degree Of Freedom ◽

Analysis Program ◽

Friction Contact ◽

Computational Dynamics ◽

Independent Degree ◽

Multi Body ◽

Abstract Predicting dynamic characteristics of an escalator by means of the computational dynamic analysis is a meaningful subject, and has not been thoroughly investigated before. The general purposed kinematic and dynamic analysis program, DADS which has been shown to be effective in the dynamic analysis of multi-body, is utilized to analyze the interaction of the escalator to be more than 900 independent degree-of-freedom. Thousands of friction contact elements are applied to correctly simulate impact, permanent contact and temporary contact of rollers and the handrail. The presented model is experimentally verified to substantiate the accuracy and efficacy.

Testing in-Phase Analysis for Adjacent Transmission Towers under Ambient Vibration

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.105-107.112 ◽

2011 ◽

Vol 105-107 ◽

pp. 112-116

Author(s):

Xiang Mei Yan

Keyword(s):

Dynamic Characteristics ◽

Damping Ratio ◽

Longitudinal Direction ◽

Ambient Vibration ◽

Induced Response ◽

Line System ◽

Vibration Data ◽

Transmission Towers ◽

Ambient Vibration Testing ◽

Suspended Cables

Based on the random vibration and system identification theory, the ambient vibration testing of two adjacent transmission towers were carried out, dynamic characteristics of the towers were obtained from ambient vibration data. The result shown that the suspended cables not only have mass effects, but have coupled stiffness effects applied to tower on transverse direction and longitudinal direction. At the same, testing value shows that the two adjacent towers have basically the same dynamic characteristics and damping ratio of the two transmission towers less than 0.01. Owing to the influence of conductors, frequency of the insulators is different to the towers at the two directions. It is disadvantage for wind-induced response of transmission line system under ambient loads.

Dynamic Characteristics Analysis of the Mud Transfer Pump Rotor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.455.248 ◽

2013 ◽

Vol 455 ◽

pp. 248-252

Author(s):

Jun Yuan Sun ◽

Ji Ming Xiao

Keyword(s):

Dynamic Analysis ◽

Modal Analysis ◽

Dynamic Characteristics ◽

Natural Frequencies ◽

Mode Shapes ◽

Dam Construction ◽

Pump Rotor ◽

Rotor Dynamic ◽

The mud pump damming technology is a new idea put forward for realization of mechanization and automation of warping dam construction. A mud pump damming machine is studied, the FEM of the mud transfer pump rotor is built, modal analysis and rotor-dynamic analysis are carried out, natural frequencies and mode shapes under different constraints are obtained and the critical speeds of the pump rotor are determined, which will provide reference to improve the running reliability of the mud transfer pump rotor.

Dynamic Characteristics Analysis of Cable-Rib Tension Deployable Antenna

Volume 5A: 40th Mechanisms and Robotics Conference ◽

10.1115/detc2016-59218 ◽

2016 ◽

Author(s):

Liu Ruiwei ◽

Hongwei Guo ◽

Zhang Qinghua ◽

Rongqiang Liu ◽

Tang Dewei

Keyword(s):

Dynamic Characteristics ◽

Structural Parameters ◽

Element Model ◽

Structure Design ◽

Antenna Structure ◽

New Type ◽

Dynamic Characteristics Analysis ◽

The Finite Element Model ◽

Weight Dynamic

Balancing stiffness and weight is of substantial importance for antenna structure design. Conventional fold-rib antennas need sufficient weight to meet stiffness requirements. To address this issue, this paper proposes a new type of cable-rib tension deployable antenna that consists of six radial rib deployment mechanisms, numerous tensioned cables, and a mesh reflective surface. The primary innovation of this study is the application of numerous tensioned cables instead of metal materials to enhance the stiffness of the entire antenna while ensuring relatively less weight. Dynamic characteristics were analyzed to optimize the weight and stiffness of the antenna with the finite element model by subspace method. The first six orders of natural frequencies and corresponding vibration modes of the antenna structure are obtained. In addition, the effects of structural parameters on natural frequency are studied, and a method to improve the rigidity of the deployable antenna structure is proposed.