Swing Reduction of Ropeway Carriers by Means of Two-Ball Rolling Type Damping Equipment

2006 ◽  
Author(s):  
H. Sato ◽  
M. Chishima
Keyword(s):  
Model Test ◽  
Design Parameters ◽  
Ball Rolling ◽  
Safety And Reliability ◽  
Transport Safety

To enhance transport safety and reliability of ropeway systems, it is essential to reduce the swing of the carriers that results from wind, etc. As a means to lessen the swing of the carriers, we will propose damping equipment that uses two balls as the movable mass. We will also discuss the method for adjusting the design parameters for this equipment. Based on a simulation, we will determine the effect of this equipment. In addition, we will refer to the results of a model test to verify the effect of this damping equipment.

Swing Reduction of Ropeway Carriers by Means of Two-Ball Rolling Type Damping Equipment: 2nd Report — Way to Implement Desired Damping for Two-Ball System

2007 ◽  
Author(s):  
H. Sato ◽  
M. Chishima
Keyword(s):  
Friction Coefficient ◽  
Frequency Response ◽  
Dynamic Model ◽  
Time Domain ◽  
Damping Coefficient ◽  
Ball Rolling ◽  
Safety And Reliability ◽  
Transport Safety ◽  
Time Domain Response ◽  
Rolling Balls

To enhance transport safety and reliability of ropeway systems, it is essential to reduce the swing of the carriers that results from wind, etc. In the previous report [1], we provided a practical damping equipment using two rolling balls (hereinafter described as “two-ball rolling type damping equipment”) to reduce the swing of ropeway carriers. A linearized dynamic model is proposed. Then, on the basis of relevant parameters, the frequency response and time domain response of the system is studied and discussed. In this report, we will study relationship between theoretical best damping coefficient ratio and friction coefficient of two-ball system. Then we will provide the way to implement the desired damping for the two-ball system. We will then provide the detail on how to estimate the inherent damping within the two-ball system. In addition, we will show and discuss two balls behavior when this equipment works experimentally.

Computational Modelling and Simulation of Pedestrian Subsystem Impactor With Sedan Vehicle and Truck Model

2020 ◽  
Author(s):  
Obaidur Rahman Mohammed ◽  
D. V. Suresh ◽  
Hamid M. Lankarani
Keyword(s):  
Finite Element ◽  
Public Transportation ◽  
Injury Risk ◽  
Computational Modelling ◽  
Design Parameters ◽  
Euro Ncap ◽  
Pedestrian Accidents ◽  
Transport Safety ◽  
Simulation Results ◽  
Pedestrian Collisions

Abstract The increase in public transportation in the last decade has resulted in a larger pedestrian population and hence a larger number of pedestrian collisions. In the past, car-pedestrian accident prevention had been a challenge for automotive and transport safety members. Recent reports in car-pedestrian accidents have influenced many improvements to prioritize pedestrian protection for automotive industries. The number of pedestrian fatalities in U.S has raised in last decade proportionally, Car manufacturers, and transport investigation teams are implementing new product designs and adding new development methods to reduce the risk of pedestrian collisions. In this study, adult headform and upper legform is tested with a finite element vehicle model to examine the simulation results and injury behavior during impact. All finite element simulation tests are produced under Euro-NCAP Committee regulations. Finite element models are configured as per the regulation’s and testing criteria. Both upper legform impactor and adult headform finite simulation results are tested with assessing criteria limits. Finite simulation tests are carried on the LS-DYNA – Code platform. This comparative study between sedan and pickup finite vehicle models gives an injury risk prediction of pedestrian safety and assesses design parameters of automotive industries.

Research on Diffusion Effect of Sewage Marine Discharge from Different Angles

2014 ◽  
Vol 675-677 ◽  
pp. 551-555
Author(s):  
Hang Yu
Keyword(s):  
Phase Ii ◽  
Marine Environment ◽  
Model Test ◽  
Deep Water ◽  
Large Angle ◽  
Premature Convergence ◽  
Design Parameters ◽  
Diffusion Effect ◽  
Environmental Material ◽  
Port Engineering

The sewage diffusion is an environmental material for protecting marine environment. It plays an important role in port engineering. Its effect under deep water was carried out between different diffuser design parameters based on the hydraulic model test, and YangKou port sewage marine disposal project phase II was taken as an example. For this project, jet angle was controlled to be 0 degree, and horizontal angle was controlled to be 0 degree. It not only can ensure that sewage fully diluted mixed, also can avoid the premature convergence and sewage lifting. It is feasible for selecting large angle nozzle under deep water and there are some technical bases have been provided for other sewage marine disposal project.

Research of Sewage Marine Discharge Diffusion Effect under Deep Water

2013 ◽  
Vol 726-731 ◽  
pp. 1027-1031
Author(s):  
Hang Yu ◽  
Jing Feng Bai ◽  
Xin Hai Wang ◽  
Hong Xin Zhao
Keyword(s):  
Model Test ◽  
Deep Water ◽  
Near Field ◽  
Large Angle ◽  
Hydraulic Model ◽  
Experimental Results ◽  
Premature Convergence ◽  
Design Parameters ◽  
Diffusion Effect ◽  
Horizontal Angle

The sewage diffusion effect under deep water was carried out between different diffuser design parameters based on the hydraulic model test, and Huizhou Dayawan sewage marine disposal project was taken as an example. The experimental results show that the design parameters are significant for sewage diffusion at the near field. For Dayawan project, jet angle was controlled to be 20 degree, and horizontal angle was controlled to be 90 degree. It not only can ensure that sewage fully diluted mixed, also can avoid the premature convergence and sewage lifting. It is feasible for selecting large angle nozzle under deep water and there are some technical bases have been provided for other sewage marine disposal project.

SAFETY AND RELIABILITY OF BREAKWATERS

1984 ◽  
Vol 1 (19) ◽  
pp. 164 ◽  
Author(s):  
A. Mol ◽  
R.L. Groeneveld ◽  
A.J. Waanders
Keyword(s):  
Reliability Analysis ◽  
Probability Distributions ◽  
Simulation Method ◽  
Design Parameters ◽  
Suggested Approach ◽  
Design Procedures ◽  
Traditional Design ◽  
Safety And Reliability ◽  
Event Trees ◽  
Rubble Mound Breakwaters

This paper discusses the need to incorporate a reliability analysis in the design procedures for rubble mound breakwaters. Such an analysis is defined and a suggested approach is outlined. Failure mechanisms are analysed and categorized in Damage Event Trees. The probability of failure is computed using a level III simulation method to include time and cumulative effects and to account for skewed probability distributions. Typical outputs of the computer program are shown and compared with results according to traditional design approaches. The paper concludes that there is a definite need to include reliability analysis in the design procedures for larger breakwaters and such an analysis must consider the accuracy of design parameters and methods.

Multicriterion Optimization of Stern Flap Design

2006 ◽  
Vol 43 (01) ◽  
pp. 42-54
Author(s):  
Michael G. Parsons ◽  
David J. Singer ◽  
Christopher M. Gaal
Keyword(s):  
Model Test ◽  
Cost Model ◽  
Specific Model ◽  
Design Parameters ◽  
Surface Model ◽  
Specific Response ◽  
Preliminary Design ◽  
Baseline Design ◽  
Multicriterion Optimization ◽  
Flap Design

Stern flaps have been used in many recent designs of transom stern vessels to provide increased top speed or to realize improvements in fuel economy over the operating range. The use of stern flaps has also become a practical retrofit on existing designs because significant improvements can be achieved at very minimal cost. Model test data from a limited series of stern flap designs for a group of combatant type vessels were utilized to develop a preliminary design model for stern flaps for these vessels. This model has been incorporated into Visual VB/Microsoft Excel-based software that will permit the investigation of the benefits of stern flaps in preliminary design. Within the limitations of the model, this software will also perform the multicriterion optimization needed to establish the initial parameters for a stern flap in preliminary design. This preliminary design can become the baseline design for use in a subsequent model test program. The software will then accept the results of tests of a systematic stern flap family developed about the baseline design and create a project-specific response surface model that can be used in subsequent detailed design. The software can then be utilized again to provide multicriterion optimization of this project-specific model to establish final design parameters for the stern flap.

Reliability measures for buried flexible pipes

2005 ◽  
Vol 42 (2) ◽  
pp. 541-549 ◽  
Author(s):  
G L Sivakumar Babu ◽  
Rajaparthy S Rao
Keyword(s):  
Bulk Density ◽  
Primary Objective ◽  
Design Parameters ◽  
Reliability Measures ◽  
Buried Pipe ◽  
Cross Sectional ◽  
Flexible Pipes ◽  
Safety And Reliability ◽  
Soil Modulus ◽  
Testing Design

The safety of infrastructure facilities such as buried pipelines is the primary objective of engineering design. An improved measure of safety and reliability of these structures can be obtained with concepts of probability. The assessment of safety involves uncertainties at various stages, such as testing, design, and field installation and operations. This paper presents a reliability analysis to estimate the deflection (cross-sectional ovalization) and buckling response of buried flexible pipes, considering uncertainties in the design parameters. The need to consider variations in design parameters, such as soil modulus and bulk density of the fill, and the influence of correlation between soil modulus and bulk density in the estimation of reliability is emphasized. It was observed that reliability index decreases with an increase in the coefficient of variation of soil modulus and bulk density of the fill and increases with increase in correlation coefficient between the variables. It is possible to obtain a central factor of safety (CFS) value on the basis of the target reliability and variations in the design parameters. The use of reliability-based considerations is illustrated with two typical simple cases of buried pipe installations.Key words: reliability measures, buried flexible pipes, deflection (ovalization), buckling, variability, safety.

scholarly journals Deterministic-Probabilistic Method of Waterway Design Parameters Determination

2012 ◽  
Vol 19 (2) ◽  
pp. 19-30
Author(s):  
Stanisław Gucma ◽  
Paweł Zalewski
Keyword(s):  
Probabilistic Method ◽  
Design Parameters ◽  
Spline Functions ◽  
Variable Speed ◽  
Minimum Width ◽  
Deterministic Methods ◽  
Positioning Method ◽  
Type Variable ◽  
Transport Safety ◽  
Speed Method

Abstract The paper presents a method of recommended waterway parameters determination, based on modified relationships derived from actual empirical research - the authors’ combination of PIANC and Canadian deterministic methods and stochastic relationships). These relationships are mostly discontinuous functions (e.g. of ship type variable, speed, method of determining the position, etc.), which can be approximated by continuous spline functions. Application built in C# allows determining the recommended minimum width of the waterway, the width increase due to the accuracy of the vessel positioning method, and the minimum radius of waterway bends. The results can be further utilized in the Decision Support System for Water Transport Safety.

Simulation Study on Sewage Discharge Environmental Effect in Tianjin South Port

2014 ◽  
Vol 1010-1012 ◽  
pp. 630-634
Author(s):  
Hang Yu
Keyword(s):  
Model Test ◽  
Deep Water ◽  
Simulation Study ◽  
Environmental Effect ◽  
Large Angle ◽  
Design Parameters ◽  
Sewage Discharge ◽  
Environmental Material ◽  
Port Engineering ◽  
Marine Environmental

The sewage diffusion is an environmental material for marine environmental protecting. It plays an important role in port engineering now. Its effect under deep water was carried out between different diffuser design parameters based on the hydraulic model test, and sewage marine disposal project in Tianjin south port was taken as an example. For this project, jet angle was controlled to be 0 degree, and horizontal angle was controlled to be 45 degree. It not only can ensure that sewage fully diluted mixed, also can avoid the premature convergence and sewage lifting. It is feasible for selecting large angle nozzle under deep water and there are some technical bases have been provided for other sewage marine disposal project.

Simulation Study on Ventilation & Cooling for an Indoor Substation

2014 ◽  
Vol 672-674 ◽  
pp. 1700-1707 ◽  
Author(s):  
Rui Xu ◽  
Zhong Min Mei ◽  
Ting Fang Yu
Keyword(s):  
Natural Ventilation ◽  
Three Dimensional ◽  
Organization Design ◽  
Temperature Fields ◽  
Design Parameters ◽  
Air Distribution ◽  
Safety And Reliability ◽  
Computational Fluid Dynamics Cfd ◽  
Dimensional Simulation ◽  
Cfd Method

— Based on natural ventilation design scheme for an indoor substation, different air distribution schemes were obtained by changing height and size of air inlets and outlets. For indoor substation, three-dimensional simulation of air distribution was conducted by using Computational Fluid Dynamics (CFD) method. Ventilation & cooling effect of different indoor ventilation schemes were simulated with software (Fluent). By analyzing velocity fields and temperature fields, influences of different design parameters on safety and reliability of main transformer room of indoor substation were compared and analyzed in details. Additionally, characteristics and change rules of air distribution with different parameter variations were concluded. Considerations of ventilation organization design for main transformer room of indoor substation and recommendation for better air distribution schemes were provided. The research results also offered some guidance for design and renovation of ventilation & cooling projects of indoor substation.

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