scholarly journals Sensitivity analysis of building physical parameters to maximize heating energy saving using MPC

2019 ◽  
Author(s):  
Behrang Vand ◽  
Yuri Kaszubowski Lopes ◽  
Elizabeth Abigail Hathway ◽  
Peter Rockett
Keyword(s):  
Sensitivity Analysis ◽  
Energy Saving ◽  
Physical Parameters

scholarly journals Squeal Frequency of a Railway Disc Brake Evaluation by FE Analyses

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
F. Cascetta ◽  
F. Caputo ◽  
A. De Luca
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Experimental Tests ◽  
Numerical Approach ◽  
System Stability ◽  
Brake System ◽  
Physical Parameters ◽  
Disc Brake ◽  
Complex Eigenvalues ◽  
The Stability

This paper deals with the development of a numerical model, based on the Finite Element (FE) theory for the prediction of the squeal frequency of a railway disc brake. The analytical background has been discussed and presented, as well as the most efficient methods for evaluating the system stability; the attention has been paid particularly to the complex eigenvalues method, which has been adopted within this paper to investigate the railway disc brake system. Numerical results have been compared with measurements from experimental tests in order to validate the proposed numerical approach. At the end of this work, a sensitivity analysis, aimed at understanding the effects of some physical parameters influencing the stability of the brake system and the squeal propensity, has been carried out.

Exergy Evaluation of the Mineral Capital on Earth: Influence of the Reference Environment

2005 ◽  
Author(s):  
Alicia Valero ◽  
Antonio Valero ◽  
Amaya Marti´nez
Keyword(s):  
Sensitivity Analysis ◽  
Physical Parameters ◽  
The World ◽  
Chemical Exergy ◽  
Reference Environment ◽  
Mineral Reserves

The mineral capital on Earth is assessed from a 2nd law of thermodynamics approach. This requires to define precisely the Reference Environment (R.E.). Therefore, the exergy difference of the mineral capital generated from different R.E. is calculated. A sensitivity analysis is done to measure the influence of the element chemical exergy and other physical parameters of the R.E. on the mineral’s exergy. The exergy of the world mineral reserves, base reserves and world resources is obtained: 0.75, 1.08 and 6.59 Gtoe, respectively.

Cumulative Microslip in Conrod Big End Bearing System

2006 ◽  
Author(s):  
Jean-Louis Ligier ◽  
Nicolas Antoni
Keyword(s):  
Sensitivity Analysis ◽  
Gas Pressure ◽  
Design Stage ◽  
Physical Parameters ◽  
Mass Reduction ◽  
Combustion Gas ◽  
Automotive Engines ◽  
Mechanical Assemblies ◽  
Material Theory ◽  
Bearing System

High combustion gas pressure and mass reduction of modern automotive engines have generated new problems in mechanical assemblies. For example, it is now common to observe bearing shell rotation in the conrod of automotive prototype engines at the design stage. The consequence is sometimes the seizure of the bearing due to the presence of the joint face relief in the loaded area. Physically, the bearing shell rotation results from cumulated microslip between the bearing and the conrod. To have a better physical approach of the phenomenon and propose design recommendations, we have performed analyses based on the strength of material theory and numerical modellings. These tools permit us to obtain simple models allowing an easier mechanical understanding as well as an analysis of sensitivity to different parameters. The main results presented in this paper are: • The basic description of the phenomenon, • The modelling of the conrod, its sensitivity to deformation and numerical validation, • The analysis of the microslip between the bearing shell and the conrod, • The sensitivity analysis with respect to conception and physical parameters.

Energy Factor Analysis in Modular Product

2011 ◽  
Vol 130-134 ◽  
pp. 1314-1317
Author(s):  
Qing Di Ke ◽  
Hong Chao Zhang ◽  
Guang Fu Liu ◽  
Bing Bing Li
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Modular Design ◽  
Design Method ◽  
Energy Performance ◽  
Physical Parameters ◽  
Physical Analysis ◽  
Energy Factor ◽  
Modular Product ◽  
Energy Equations

Nowadays, due to the huge energy consumption, the energy-saving problems of the product have been emphasized with many designers. In this paper, informed by the modular design method, the total energy performance in modular product can be analyzed and separated into the energy performances of basic modules. And with the physical analysis of basic modules, the energy equations are established with the band graphs theory. Then, the physical parameters, which could influence the energy consumption, are identified as “energy factor”. Thus, the energy consumption of the modules could be optimized with adjusting design factors, and the energy-saving design scheme for the whole product is obtained in the optimized model. Finally, the model and the method in this paper are demonstrated by an instance of the crank block pump.

Estimation of Cumene Cracking Reaction-Diffusion Model Parameters: Uniqueness and Parametric Sensitivity Analysis

2003 ◽  
Vol 1 (1) ◽  
Author(s):  
Peter Schwan ◽  
Klaus P Möller
Keyword(s):  
Sensitivity Analysis ◽  
Steady State ◽  
Parameter Estimates ◽  
Physical Parameters ◽  
Model Parameters ◽  
Response Curves ◽  
Cumene Cracking ◽  
Irreversible Reaction ◽  
Reaction Diffusion Model ◽  
Order Of Magnitude

The pulse response of cumene cracking over ZSM5 extrudates has been measured using a Jetloop recycle reactor. A model assuming first order irreversible reaction with constant macro-pore diffusivity and linear adsorption was used to describe the response curves of the reactants and products. The model parameters adsorption, diffusion and reaction rate are in general highly correlated. Relationships for regions of parameter insensitivity and correlation functions between dependent parameters are given. With the aid of independent measurement of adsorption, a sensitivity analysis and a similarity analysis between equations, it was possible to reduce the 7 parameter model into a 2 parameter model for conditions of strong diffusion limitation observed in these experiments. Although good model fits could be achieved, a high degree of uncertainty in the parameter estimates remained, which reflects the high correlation of the physical parameters. Comparison with steady state results shows that the transient diffusivity for cumene is approximately equal to the Knudsen diffusivity, but an order of magnitude lower than the steady state diffusivity. The transient Thiele modulus for cumene was an order of magnitude higher than the steady state value.

scholarly journals Sensitivity Analysis of a Nuclear Reactor System Finite Element Model

2018 ◽  
Author(s):  
Gregory A. Banyay ◽  
Stephen D. Smith ◽  
Jason S. Young
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Surrogate Model ◽  
Computational Design ◽  
Element Model ◽  
Sensitivity Analyses ◽  
Physical Parameters ◽  
Loading Conditions ◽  
Pressurized Water

The structures associated with the nuclear steam supply system (NSSS) of a pressurized water reactor (PWR) warrant evaluation of various non-stationary loading conditions which could occur over the life of a nuclear power plant. These loading conditions include those associated with a loss of coolant accident and seismic event. The dynamic structural system is represented by a finite element model consisting of significant epistemic and aleatory uncertainties in the physical parameters. To provide an enhanced understanding of the influence of these uncertainties on model results, a sensitivity analysis is performed. This work demonstrates the construction of a computational design of experiment which runs the finite element model a sufficient number of times to train and verify a unique aggregate surrogate model. Adaptive sampling is employed in order to reduce the overall computational burden. The surrogate model is then used to perform both global and local sensitivity analyses.

scholarly journals Sensitivity analysis of electromagnetic quantities in time domain by means of fem

2004 ◽  
Vol 1 (2) ◽  
pp. 167-174 ◽  
Author(s):  
Konstanty Gawrylczyk ◽  
Mateusz Kugler
Keyword(s):  
Sensitivity Analysis ◽  
Finite Elements ◽  
Objective Function ◽  
Time Domain ◽  
Optimization Theory ◽  
Computational Effort ◽  
Physical Parameters ◽  
Mass Matrices ◽  
Electromagnetic Quantities ◽  
Measurement Coil

Sensitivity analysis belongs to the most important tools in optimization theory. It determines the dependence of global or local electromagnetic quantities on geometrical and physical parameters expressed in the form of an objective function. For several objective functions the sensitivity may be directly calculated differentiating the objective function versus one of material or geometric parameters. Such approach needs large computational effort, especially while evaluating in time domain. This paper presents effective methods for computing of sensitivity of nodal potentials in finite elements versus perturbations in conductivity of analyzed model in time domain. Derived equations are based on the method of stiffness and mass matrices derivative and Tellegen?s theorem known from circuit theory and have been expanded on field theory. Numerical example presented in the paper shows sensitivity of voltage induced in measurement coil versus variation of electrical conductivity in single finite element as function of time. The proposed methods calculate the sensitivity versus all finite elements in area of analysis at once. On the basis of sensitivity information the iterative algorithm for identification of shape and conductivity distribution of material flaws could be applied.

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