scholarly journals Survey of Sensitivity Analysis Methods During the Simulation of Residual Stresses in Simple Composite Structures

2018 ◽  
Author(s):  
STACY NELSON ◽  
ALEXANDER HANSON ◽  
BRIAN WERNER ◽  
KEVIN NELSON ◽  
TIMOTHY BRIGGS
Keyword(s):  
Sensitivity Analysis ◽  
Residual Stresses ◽  
Composite Structures ◽  
Analysis Methods

scholarly journals Comparing sensitivity analysis methods to advance lumped watershed model identification and evaluation

2007 ◽  
Vol 11 (2) ◽  
pp. 793-817 ◽  
Author(s):  
Y. Tang ◽  
P. Reed ◽  
T. Wagener ◽  
K. van Werkhoven
Keyword(s):  
Sensitivity Analysis ◽  
Model Identification ◽  
Local Analysis ◽  
Time Interval ◽  
Watershed Model ◽  
Soil Moisture Accounting ◽  
Analysis Methods ◽  
Accounting Model ◽  
Sobol’S Method ◽  
Comparative Results

Abstract. This study seeks to identify sensitivity tools that will advance our understanding of lumped hydrologic models for the purposes of model improvement, calibration efficiency and improved measurement schemes. Four sensitivity analysis methods were tested: (1) local analysis using parameter estimation software (PEST), (2) regional sensitivity analysis (RSA), (3) analysis of variance (ANOVA), and (4) Sobol's method. The methods' relative efficiencies and effectiveness have been analyzed and compared. These four sensitivity methods were applied to the lumped Sacramento soil moisture accounting model (SAC-SMA) coupled with SNOW-17. Results from this study characterize model sensitivities for two medium sized watersheds within the Juniata River Basin in Pennsylvania, USA. Comparative results for the 4 sensitivity methods are presented for a 3-year time series with 1 h, 6 h, and 24 h time intervals. The results of this study show that model parameter sensitivities are heavily impacted by the choice of analysis method as well as the model time interval. Differences between the two adjacent watersheds also suggest strong influences of local physical characteristics on the sensitivity methods' results. This study also contributes a comprehensive assessment of the repeatability, robustness, efficiency, and ease-of-implementation of the four sensitivity methods. Overall ANOVA and Sobol's method were shown to be superior to RSA and PEST. Relative to one another, ANOVA has reduced computational requirements and Sobol's method yielded more robust sensitivity rankings.

scholarly journals The Application and Implications of Novel Deterministic Sensitivity Analysis Methods

2020 ◽  
Vol 39 (1) ◽  
pp. 1-17
Author(s):  
Rick A. Vreman ◽  
Joost W. Geenen ◽  
Saskia Knies ◽  
Aukje K. Mantel-Teeuwisse ◽  
Hubert G. M. Leufkens ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Deterministic Sensitivity Analysis ◽  
Analysis Methods

Reliability and sensitivity analysis of composite structures by an adaptive Kriging based approach

2021 ◽  
Vol 278 ◽  
pp. 114682
Author(s):  
Changcong Zhou ◽  
Chen Li ◽  
Hanlin Zhang ◽  
Haodong Zhao ◽  
Chunping Zhou
Keyword(s):  
Sensitivity Analysis ◽  
Composite Structures ◽  
Adaptive Kriging

A Sensitivity Analysis Based Method for Robot Calibration

1992 ◽  
Author(s):  
S. Kaizerman ◽  
B. Benhabib ◽  
R. G. Fenton ◽  
G. Zak
Keyword(s):  
Sensitivity Analysis ◽  
Kinematic Model ◽  
Calibration Procedure ◽  
Inverse Kinematic ◽  
Model Parameters ◽  
Robot Calibration ◽  
Adjoint Sensitivity ◽  
Analysis Methods ◽  
The Matrix ◽  
Direct Sensitivity

Abstract A new robot kinematic calibration procedure is presented. The parameters of the kinematic model are estimated through a relationship established between the deviations in the joint variables and the deviations in the model parameters. Thus, the new method can be classified as an inverse calibration procedure. Using suitable sensitivity analysis methods, the matrix of the partial derivatives of joint variables with respect to robot parameters is calculated without having explicit expressions of joint variables as a function of task space coordinates (closed inverse kinematic solution). This matrix provides the relationship between the changes in the joint variables and the changes in the parameter values required for the calibration. Two deterministic sensitivity analysis methods are applied, namely the Direct Sensitivity Approach and the Adjoint Sensitivity Method. The new calibration procedure was successfully tested by the simulated calibrations of a two degree of freedom revolute-joint planar manipulator.

scholarly journals An Improved Analytical Solution for Process-Induced Residual Stresses and Deformations in Flat Composite Laminates Considering Thermo-Viscoelastic Effects

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2506 ◽  
Author(s):  
Chao Liu ◽  
Yaoyao Shi
Keyword(s):  
Differential Equation ◽  
Finite Element ◽  
Analytical Solution ◽  
Residual Stresses ◽  
Composite Laminates ◽  
Composite Structures ◽  
Numerical Models ◽  
Element Analysis ◽  
Current Time ◽  
Viscoelastic Effects

Dimensional control can be a major concern in the processing of composite structures. Compared to numerical models based on finite element methods, the analytical method can provide a faster prediction of process-induced residual stresses and deformations with a certain level of accuracy. It can explain the underlying mechanisms. In this paper, an improved analytical solution is proposed to consider thermo-viscoelastic effects on residual stresses and deformations of flat composite laminates during curing. First, an incremental differential equation is derived to describe the viscoelastic behavior of composite materials during curing. Afterward, the analytical solution is developed to solve the differential equation by assuming the solution at the current time, which is a linear combination of the corresponding Laplace equation solutions of all time. Moreover, the analytical solution is extended to investigate cure behavior of multilayer composite laminates during manufacturing. Good agreement between the analytical solution results and the experimental and finite element analysis (FEA) results validates the accuracy and effectiveness of the proposed method. Furthermore, the mechanism generating residual stresses and deformations for unsymmetrical composite laminates is investigated based on the proposed analytical solution.

Development of Design Analysis Methods for Carbon Silicon Carbide Composite Structures

2007 ◽  
Vol 41 (10) ◽  
pp. 1197-1215 ◽  
Author(s):  
Roy M. Sullivan ◽  
Pappu L.N. Murthy ◽  
Subodh K. Mital ◽  
Joseph L. Palko ◽  
Jacques C. Cuneo ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Composite Structures ◽  
Design Analysis ◽  
Carbide Composite ◽  
Analysis Methods

scholarly journals Convergence of sensitivity analysis methods for evaluating combined influences of model inputs

2019 ◽  
Vol 189 ◽  
pp. 109-122 ◽  
Author(s):  
Majdi Awad ◽  
Tristan Senga Kiesse ◽  
Zainab Assaghir ◽  
Anne Ventura
Keyword(s):  
Sensitivity Analysis ◽  
Analysis Methods
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