scholarly journals STABILITY ANALYSIS OF OCEAN PIPELINES : A PROBABILISTIC APPROACH

1986 ◽  
Vol 1 (20) ◽  
pp. 139
Author(s):  
Leon C. Geustyn ◽  
Gideon De F. Retief
Keyword(s):  
Monte Carlo Simulation ◽  
Stability Analysis ◽  
Probabilistic Approach ◽  
Statistical Error ◽  
Lateral Stability ◽  
Deterministic Approach ◽  
Stochastic Nature ◽  
Simulation Techniques ◽  
Sea Bed ◽  
The Stability

A probabilistic approach to the lateral stability of a pipeline on the sea-bed is considered. The uncertainties involved in the deterministic approach, due to the stochastic nature of variables, inaccuracy of models and statistical error are discussed. Variables representing these uncertainties are identified and their statistical properties investigated. Procedures for computing the probability of stability failure are developed using both analytical and Monte Carlo simulation techniques. Example calculations are presented indicating typical applications. It is concluded that the probabilistic procedure, as presented here, can serve as a valuable tool in the stability analysis of ocean pipelines.

A Study of the Lateral Stability of Railroad Vehicles Using a Nonlinear Constrained Multibody Formulation

2001 ◽  
Author(s):  
Davide Valtorta ◽  
Khaled E. Zaazaa ◽  
Ahmed A. Shabana ◽  
Jalil R. Sany
Keyword(s):  
Stability Analysis ◽  
Linear Stability ◽  
Linear Theory ◽  
Linear Stability Analysis ◽  
Numerical Study ◽  
Operating Conditions ◽  
Lateral Stability ◽  
Railroad Vehicles ◽  
Contact Formulation ◽  
The Stability

Abstract The lateral stability of railroad vehicles travelling on tangent tracks is one of the important problems that has been the subject of extensive research since the nineteenth century. Early detailed studies of this problem in the twentieth century are the work of Carter and Rocard on the stability of locomotives. The linear theory for the lateral stability analysis has been extensively used in the past and can give good results under certain operating conditions. In this paper, the results obtained using a linear stability analysis are compared with the results obtained using a general nonlinear multibody methodology. In the linear stability analysis, the sources of the instability are investigated using Liapunov’s linear theory and the eigenvalue analysis for a simple wheelset model on a tangent track. The effects of the stiffness of the primary and secondary suspensions on the stability results are investigated. The results obtained for the simple model using the linear approach are compared with the results obtained using a new nonlinear multibody based constrained wheel/rail contact formulation. This comparative numerical study can be used to validate the use of the constrained wheel/rail contact formulation in the study of lateral stability. Similar studies can be used in the future to define the limitations of the linear theory under general operating conditions.

scholarly journals Alternative Models for Calculation of Static Overturning Angle and Lateral Stability Analysis of Subcompact and Universal Tractors

Agriculture ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 861
Author(s):  
Radoslav Majdan ◽  
Rudolf Abrahám ◽  
Katarína Kollárová ◽  
Zdenko Tkáč ◽  
Eva Matejková ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Calculation Method ◽  
Rear Axle ◽  
Rear Wheel ◽  
Center Of Gravity ◽  
Lateral Stability ◽  
Regression Effect ◽  
Minimal Difference ◽  
Significant Regression ◽  
The Stability

Vehicle lateral stability is evaluated using the static overturning angle. The correct value of this parameter depends on the calculation method. The aim of this study was to compare the latest standard with previously published methodology, to propose two alternative methodologies (Models 1 and 2) and to analyze the influence of various levels of rear wheel ballast weights and overall tire widths on the stability of universal and subcompact tractors. The results showed a significant regression effect of the rear wheel ballast weight on static overturning angle. The influence of the rear wheel ballast weight was higher in the subcompact tractor than in the universal tractor due to a larger distance between the height of the center of gravity and the center of the rear axle. Comparing the latest standard with the previously published methodology, the highest difference values were 13.82% and 7.30%. Both models are based on the previously published methodology and differ from each other in rolling and slope lines. The methodology proposed in Model 2 differed from the standard similarly to the previously published methodology; therefore, it is irrelevant. Model 1 reached differences of only −1.81% and −1.63%, representing a minimal difference from the standard.

scholarly journals Probabilistic analysis of flood embankment stability: the case study of the Adige River embankment in Italy

2020 ◽  
Vol 195 ◽  
pp. 01003
Author(s):  
Alessia Amabile ◽  
Fabio De Polo ◽  
Alessandro Tarantino
Keyword(s):  
Stability Analysis ◽  
Probabilistic Approach ◽  
Flood Hazards ◽  
Probabilistic Distribution ◽  
Worldwide Phenomenon ◽  
The Stability ◽  
River Embankment ◽  
Flood Defence ◽  
Embankment Stability

Flooding is a worldwide phenomenon. Over the last few decades the world has experienced a rising number of devastating flood events and the trend in such natural disasters is increasing. Furthermore, escalations in both the probability and magnitude of flood hazards are expected as a result of climate change. Flood defence embankments are one of the major flood defence measures and stability assessment for these structures is therefore a very important process. Traditional deterministic approaches to stability analysis do not allow taking into account and quantifying the uncertainties in soil characterisation. For this reason they may not be sufficient to capture the failure of flood embankments. The paper presents a probabilistic approach for the stability analysis of flood embankments taking into account the probabilistic distribution of soil hydro-mechanical properties. The approach is validated against the failure case study of the Adige river embankment in Italy, by comparing the probability of failure of two sections, within and outside the failure segment respectively.

A PROBABILISTIC APPROACH TO THE STABILITY ANALYSIS OF REAL-TIME CONTROL SYSTEMS

2005 ◽  
Vol 38 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Manel Velasco ◽  
Pau Martí ◽  
Ricard Villà ◽  
Josep M. Fuertes ◽  
Jordi Ayza ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Control Systems ◽  
Real Time ◽  
Probabilistic Approach ◽  
Real Time Control ◽  
Time Control ◽  
The Stability

scholarly journals Effect of Twin Vertical Stabilizers on Lateral Directional Static Stability of an Aircraft – A Computational Study

2022 ◽  
pp. 89-95
Author(s):  
K Ajay Kumar Goud ◽  
Y D Dwivedi
Keyword(s):  
Stability Analysis ◽  
Dynamic Model ◽  
Computational Study ◽  
Static Stability ◽  
Lateral Stability ◽  
Control Parameters ◽  
Stability And Control ◽  
The Stability ◽  
And Control ◽  
The Relationship

The advantages of twin vertical Stabilizers over a single vertical Stabilizer of an aero plane are the rationale for this study. For conventional aero planes, the use of double vertical Stabilizers is being considered. The contribution to lateral stability has been examined for this application. XFLR5 software was used to conduct the overall analysis. The analysis was conducted for a single vertical Stabilizer as well as twin vertical Stabilizers, and the findings were compiled and correlated. It is critical to be able to fully explain and evaluate the stability and control parameters. It is crucial to understand the relationship between the aerodynamics of the airframe and its stability characteristics in order to increase flight endurance and deployment effectiveness. The stability analysis based on the dynamic model of the twin boom vertical Stabilizer is presented in this paper. The lateral-directional stability of an aero plane with a single vertical tail is determined to be 20% more efficient than that with twin boom vertical Stabilizers. The trim condition is moderately satisfied by an aircraft with twin vertical Stabilizers.

Sign in / Sign up

Export Citation Format

Share Document