scholarly journals Numerical Analysis Models for Jointless Bridges Through Sensitivity Analysis

2021 ◽  
Vol 34 (4) ◽  
pp. 255-262
Author(s):  
Chi-Oug Noh ◽  
Seung-Won Kim ◽  
Hwan-Woo Lee ◽  
Moon-Seok Nam
Keyword(s):  
Sensitivity Analysis ◽  
Numerical Analysis ◽  
Jointless Bridges ◽  
Analysis Models

Evaluation of bridge support condition using bridge responses

2018 ◽  
Vol 18 (3) ◽  
pp. 767-777 ◽  
Author(s):  
Young-Soo Park ◽  
Sehoon Kim ◽  
Namgyu Kim ◽  
Jong-Jae Lee
Keyword(s):  
Sensitivity Analysis ◽  
Numerical Analysis ◽  
Field Test ◽  
Laboratory Tests ◽  
Spring Constant ◽  
Scale Model ◽  
Support Condition ◽  
Bridge Responses ◽  
Spring Constants

This article presents a method for evaluating the support condition of bridges. This is done by representing the aging and deteriorated supports as rotation springs with equivalent spring constants. Sensitivity analysis was performed to obtain a relationship between the spring constant and the bridge responses (deflections/slopes). From this relationship, measured bridge responses can be used to estimate the equivalent spring constants through interpolation. Numerical analysis was performed to check whether the method can be used to calculate equivalent spring constants. Then, the method was verified by performing laboratory tests on a scale model bridge and field test on an actual bridge. In both tests, spring constants were estimated using the proposed method and then verified by calculating the displacements and frequencies and comparing them to the measured values.

Numerical Analysis of the Dynamic Interaction Between Pantograph and Overhead Contact Line Using FEM

2011 ◽  
Author(s):  
Sung Pil Jung ◽  
Tae Won Park ◽  
Jin Hee Lee
Keyword(s):  
Numerical Analysis ◽  
Contact Line ◽  
Dynamic Interaction ◽  
Fe Analysis ◽  
Contact Forces ◽  
Analysis Program ◽  
Analysis Model ◽  
Element Analysis ◽  
Simulation Results ◽  
Analysis Models

This study aims to create a numerical analysis model which can investigate the interaction between pantograph and overhead contact line used for railway vehicles, and validate the simulation results according to EN 50318 standards. Finite element analysis models of pantograph and overhead contact line are created using SAMCEF, a commercial FE analysis program, and mean, standard deviation, maximum and minimum values of contact forces are obtained. The simulation results are validated according to EN 50318, and the reliability of SAMCEF as an analysis solver of railway vehicle’s catenary system is discussed.

NUMERICAL ANALYSIS OF SMART STRUCTURES WITH UNCERTAINTIES

2004 ◽  
Vol 01 (02) ◽  
pp. 227-239 ◽  
Author(s):  
S. VALLIAPPAN ◽  
C. K. CHEE
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Numerical Analysis ◽  
Fuzzy Sets ◽  
Numerical Method ◽  
Smart Structures ◽  
Sensitivity Index ◽  
Material Parameters ◽  
Element Technique ◽  
Fuzzy Parameters

In this paper, a numerical method for the analysis of smart structures with uncertainties involved in the material parameters is presented. This method combines the finite element technique, concepts of fuzzy sets and optimization. For the optimization of fuzzy parameters, a sensitivity index is proposed. The sensitivity analysis based on the proposed sensitivity index can be effectively used to reduce the number of variables to be fuzzified and thus reducing the computational efforts considerably.

scholarly journals The Economic Order Quantity in a Fuzzy Environment for a Periodic Inventory Model with Variable Demand

2022 ◽  
pp. 102-107
Author(s):  
K. Kalaiarasi ◽  
MARY HENRIETTA H ◽  
M. Sumathi ◽  
A. Stanley Raj
Keyword(s):  
Sensitivity Analysis ◽  
Numerical Analysis ◽  
Fuzzy Numbers ◽  
Economic Order Quantity ◽  
Economic Order ◽  
Order Quantity ◽  
Critical Part ◽  
Intuitionistic Fuzzy Numbers ◽  
Intuitionistic Fuzzy ◽  
Fuzzy Environment

The technique of limiting expenditure plays a critical part in an organization's ability to govern the smooth operation of its management system. The economic order quantity (EOQ) is calculated by solving a nonlinear problem, and the best solution is investigated in a fuzzy and intuitionistic fuzzy environment. The overall cost is made up of several factors, such as demand, holding, and ordering costs. The demand and stock-out characteristics were both fuzzified using fuzzy and intuitionistic fuzzy numbers. The numerical analysis shows the comparison between the two fuzzy numbers through sensitivity analysis.

Credit Policies for Deteriorating Imperfect Quality Items With Exponentially Increasing Demand and Partial Backlogging

2018 ◽  
pp. 90-106 ◽  
Author(s):  
Chandra K. Jaggi ◽  
Prerna Gautam ◽  
Aditi Khanna
Keyword(s):  
Sensitivity Analysis ◽  
Numerical Analysis ◽  
Trade Credit ◽  
Partial Backlogging ◽  
Inverse Relation ◽  
Screening Process ◽  
Imperfect Quality ◽  
Inspection Process ◽  
Increasing Demand ◽  
Delay In Payments

In retail industries every ordered lot carry some fraction of imperfect quality items which can vary depending upon production and handling conditions. The situation is even more subtle when the items are prone to deterioration. However, an inspection process can spare us from such a criticality by bifurcating the defectives from the good quality lot. Thus, a screening process is mandatory. In the hyper-competitive market, trade-credit is well-known gimmick in order to boost the sales. Keeping in view, an inventory scenario of a retailer is investigated who has to deal with imperfect and “deteriorating items” under “permissible delay in payments”. The demand is assumed to be increasing exponentially. Shortages are permitted to occur and supposed to be “partially backlogged.” Rate of backlogging is assumed to have inverse relation with the waiting time for the subsequent replenishment. In this chapter, shortage point and length of cycle are jointly optimized. Numerical analysis and sensitivity analysis is performed to provide important insights for managerial persistence.

Numerical Analysis of the Wave Topping Unit for Small Turbojet

2010 ◽  
Author(s):  
Janusz Piechna ◽  
Rafael Cerpa ◽  
Staniszewski Marcin ◽  
Pezhman Akbari ◽  
Norbert Mu¨ller
Keyword(s):  
Numerical Analysis ◽  
Reverse Flow ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Wave Rotor ◽  
High Rotational Speed ◽  
Machine Performance ◽  
Flow Features ◽  
The Common ◽  
Analysis Models

The paper is focused on the numerical analysis of a wave topping unit used in a small turbojet engine. The analysis focuses on a four-port reverse flow (RF) wave rotor. The special feature of the considered wave rotor is its very high rotational speed. The wave rotor is connected directly with the common shaft between compressor and turbine, thus, the effects of Coriolis accelerations become important. In this study, first a one-dimensional model is used to estimate geometry of the wave rotor and port timings. Then, multi-dimensional analysis models are employed to predict the different flow characteristics inside the wave rotor channels. Three-dimensional flow features that reduce machine performance and influence rotor blade and duct wall thermal loads are identified.

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