Application of multi-antenna GPS technique in the stability monitoring of roadside slopes

2008 ◽  
pp. 1411-1416
Keyword(s):  
Stability Monitoring ◽  
The Stability

Feasibility Boundary Evaluation Using Eigenproperties of Jacobi Matrix from the Power Flow Routine

2013 ◽  
Vol 860-863 ◽  
pp. 2112-2116
Author(s):  
Pavel V. Chusovitin ◽  
Andrey V. Pazderin ◽  
Grigory S. Shabalin ◽  
Valery A. Taschilin
Keyword(s):  
Power System ◽  
Power Flow ◽  
Jacobi Matrix ◽  
Power System Stability ◽  
System Stability ◽  
Stability Monitoring ◽  
Boundary Evaluation ◽  
Shortest Distance ◽  
On Line ◽  
The Stability

The paper is devoted to the stability and feasibility boundary evaluation. New technique for evaluating shortest distance to feasibility boundary is described and tested. The technique is based on analysis of Jacobi matrix form the power flow routine. Described technique can be applied together with PMU-based identification procedures leading to new opportunities for on-line power system stability monitoring.

Numerical Analysis of Lateral Wave Propagation in Drill-String for Stability Monitoring

2014 ◽  
Author(s):  
Yu Liu ◽  
Andrew J. Dick
Keyword(s):  
Wave Propagation ◽  
Drill String ◽  
Lateral Impact ◽  
Monitoring Scheme ◽  
Time Frequency ◽  
Impact Wave ◽  
Lateral Wave ◽  
Stability Monitoring ◽  
The Stability ◽  
Spectral Finite Element

In this paper, the propagation of lateral waves in a drill-string are studied by using a new numerical method and a stability monitoring scheme is proposed. The drill-string is modeled as a linear beam structure under gravitational field effects. An iterative wavelet-based spectral finite element method (WS-FEM) model is developed to obtain a high fidelity response. Numerical simulations of the lateral impact wave propagation at the bottom-hole-assembly (BHA) are conducted and a time-frequency analysis technique is applied to the response in order to identify the relationship between the position of the transition point between positive and negative strain and the dispersive properties of the lateral wave. Based on the results, a new monitoring scheme is proposed to monitor the stability of the drill-string based on a combination of lateral impact wave analysis at the BHA and the axial acoustic telemetry technique.

Stability Monitoring Using Voltage Perturbation for DC Distributed Power Systems

2002 ◽  
Vol 8 (2) ◽  
pp. 277-288 ◽  
Author(s):  
Jinjun Liu ◽  
Xiaogang Feng ◽  
Zhihong Ye ◽  
Fred C. Lee ◽  
Dushan Borojevich
Keyword(s):  
Power Systems ◽  
Perturbation Method ◽  
System Stability ◽  
Distributed Power ◽  
Stability Monitoring ◽  
Implementation Approach ◽  
Distributed Power Systems ◽  
Perturbation Source ◽  
On Line ◽  
The Stability

The stability issues in nonlinear systems such as multi-module power electronics systems, especially DC distributed power systems, are often dealt with by employing the impedance criterion. However, for on-line system stability monitoring, to direct measure the impedance of the source and load subsystems and then making comparisons is complicated and difficult. This paper proposes a practical and simple method, which involves utilizing voltage perturbation, to monitor the stability margin of DC distributed power systems. A voltage perturbation source is applied to the DC side of the system and only the amplitude of two voltages needs to be measured, therefore this method can be easily used for on-line stability monitoring. An implementation approach of this method, which does not employ additional voltage perturbation source but utilizes the front-end subsystem, is also presented. Theoretical analysis and computer simulations are given to verify the effectiveness of both the monitoring method and the implementation approach. A comparative evaluation of the voltage perturbation method versus the current perturbation method for stability monitoring is provided.

The Stability Monitoring of High Fill Soggy Railway Embankment in Chongqing Steel Plant

2014 ◽  
Vol 1049-1050 ◽  
pp. 442-446
Author(s):  
Qian Su ◽  
Jun Kai Yao ◽  
Jia Hao ◽  
Wen Sun
Keyword(s):  
Internal Stress ◽  
Dynamic Stability ◽  
Special Section ◽  
Horizontal Displacement ◽  
Steel Plant ◽  
Measuring Instruments ◽  
Mountainous Area ◽  
Stability Monitoring ◽  
Precision Measuring ◽  
The Stability

Based on the special section of high fill soggy embankment in Chongqing Steel Plant Railway, we successfully implemented high fill soggy embankment’s dynamic stability monitoring by laying high precision measuring instruments inside the embankment. This stability monitoring reveals the changes and rules of the lateral horizontal displacement, layered settlement, internal stress of this particular form of embankment and provides references for designing and construction for high fill soggy embankment in mountainous area.

Stability of Online Monitoring Stress for Shipbuilding Portal Crane

2014 ◽  
Vol 541-542 ◽  
pp. 1424-1428 ◽  
Author(s):  
Qing Liang Niu ◽  
Wei Xiao Tang ◽  
Nan Shan ◽  
Xue Ping Zhao
Keyword(s):  
Online Monitoring ◽  
Monitoring Method ◽  
Measuring Point ◽  
Wireless Monitoring ◽  
Signal Stability ◽  
Stability Monitoring ◽  
Project Costs ◽  
The Stability ◽  
Strain Signal ◽  
Portal Crane

The biggest problems of online monitoring stress for crane currently are the signal stability problem and the high cost problem. Aiming at these problems, the authors design the stability monitoring project for shipbuilding portal crane. The project adopts the wired monitoring method and the strain signal is amplified preliminarily at the measuring point, the combination of both which overcomes the problems of strain signal attenuation and electromagnetic interferences. The acquisition box is reset punctually to avoid the drift problem. An experiment of online monitoring stress for shipbuilding portal crane used for 5 years is done in a shipyard, and the experiment proves that the effective relative error is less than 6%. Compared with the wireless monitoring way, the project costs lower and isnt subject to electromagnetic interferences. Moreover, compared with the traditional wired monitoring way, the program has more stability signal.

scholarly journals A Cosmic Rays Tracking System for the Stability Monitoring of Historical Buildings

2019 ◽  
Author(s):  
Germano Bonomi ◽  
M. Caccia ◽  
A. Donzella ◽  
D. Pagano ◽  
V. Villa ◽  
...  
Keyword(s):  
Cosmic Rays ◽  
Tracking System ◽  
Historical Buildings ◽  
Stability Monitoring ◽  
The Stability
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