Dynamic Characteristics Analysis of West-East Pipeline in China

2006 ◽  
Author(s):  
Yan Wu ◽  
Jing Gong ◽  
Li Fan
Keyword(s):  
Mathematical Models ◽  
Dynamic Characteristics ◽  
Hydraulic System ◽  
Initial Conditions ◽  
Hydraulic Characteristics ◽  
Operational Characteristics ◽  
Characteristics Analysis ◽  
The Impact ◽  
Dynamic Characteristics Analysis ◽  
Operation Characteristics

This paper, which is based on West-East Gas Transportation Project, manages to build mathematical models to describe hydraulic characteristics and simulate the operation of the system. It studies the impact of changes in hydraulic system, and analyzes the fluctuations in operational characteristics of pipeline combined with initial conditions and boundary conditions, particularly those delivery points that connect different consumers, and investigates operation characteristics and the interaction between laterals, liaison pipelines and the mainline.

Dynamic Characteristics Analysis and Modeling of Giant Magnetostrictive Actuator Turning System

2013 ◽  
Vol 477-478 ◽  
pp. 321-324
Author(s):  
Dong Li ◽  
Da-Wei Luan ◽  
Zhen-Fang Wang ◽  
Tao Ma
Keyword(s):  
Dynamic Characteristics ◽  
Force Model ◽  
Turning Process ◽  
Finite Element Software ◽  
Characteristics Analysis ◽  
Magnetostrictive Actuator ◽  
The Time Domain ◽  
The Impact ◽  
Turning System ◽  
Dynamic Characteristics Analysis

Based on DEFORM finite element software, the model of turning process of GMA was built, and the relation function among turning speed, turning depth and turning force of GMA turning system was achieved. Then, considering the turning force model, the dynamic equation of the turning system was established and the time domain and frequency domain of GMA turning system were discussed with different corresponding parameters. Results show that turning speed and turning depth have apparent effects on turning force of GMA turning system. Therefore, it is necessary to take the impact into consideration when analyzing dynamic characteristics of the turning system.

Model of Precision Loss for the Precision Ball Screw

2013 ◽  
Vol 753-755 ◽  
pp. 1680-1685 ◽  
Author(s):  
Guang Yuan Xu ◽  
Wei Jun Tao ◽  
Hu Tian Feng
Keyword(s):  
Dynamic Characteristics ◽  
Classical Mechanics ◽  
Load Condition ◽  
Ball Screw ◽  
Contact Theory ◽  
Hertz Contact ◽  
External Interference ◽  
Characteristics Analysis ◽  
The Impact ◽  
Dynamic Characteristics Analysis

Aiming at the precision retaining ability problems of the precision ball screw, the modeling on the motion precision loss process under load condition is studied. The mechanics and deformation of the interface of ball and groove under load condition is analyzed by using the classical mechanics and Hertz contact theory, also a precision loss model for precision ball screw is established based on the dynamic characteristics analysis of the ball screw. Regardless of the external interference, the impact of various factors on the precision loss is analyzed and calculated.

Dynamic Characteristics Analysis and Optimization for Hydraulic System of a Self-Propelled Steel Bridge Based on AMESim

2011 ◽  
Vol 250-253 ◽  
pp. 2146-2152
Author(s):  
Wei Ping Peng ◽  
Hui Fang Liu ◽  
Zhao Liu ◽  
Re Xia
Keyword(s):  
Dynamic Characteristics ◽  
Hydraulic System ◽  
Fluid Pressure ◽  
Sudden Change ◽  
Steel Bridge ◽  
Testing Performance ◽  
Characteristics Analysis ◽  
Hydraulic Cylinders ◽  
Dynamic Characteristics Analysis ◽  
Research Show

Based on AMESim，a method of dynamic characteristics analysis and optimization for hydraulic system of a self-propelled steel bridge (SPSB) is presented. The approach of this work includes steps of (1) modeling the hydraulic system by defining components and their parameters according to working conditions; (2) evaluating control modes of the system, testing performance of components and analyzing main factors causing load-impacted and movement-unsynchronized of cylinders in the system by repeated changing and running of the model; and (3) improving the system. The results of this research show that sudden change of piston-rod movement and fluid pressure in hydraulic cylinders could lead to larger load-impacted of the system, and fluid pressure loss and load change of hydraulic cylinders would greatly effect on stability and synchronization of the system; but accumulators installed in the circuits can effectively decrease load impact and enhance movement steady of cylinders, and proportional valves used to control the circuits can obviously improve synchronization performance of cylinders.

Dynamic Characteristics Analysis of Cable-Rib Tension Deployable Antenna

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 ◽  
Characteristics Analysis ◽  
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.

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