نتایج جستجو برای ' Sensitivity analysis '

Sensitivity Analysis of Dual Mixed Refrigerant Cycle for low temperature Processes Sensitivity analysis can be used to identify important model parameters, in particular, normalized sensitivity coefficients; by allowing a one-on-one comparison. In this paper, important parameters of two optimal conditions of the Dual Mixed Refrigerant (DMR) cycles were identified by sensitivity analysis. For these conditions, the normalized sensitivity coefficient values indicated that power consumption of the ...

Sensitivity analysis of force generated in high-strength, pre-tensioned bolts with T-stub connections In this paper, the sensitivity analysis of the force generated in high-strength, pre-tensioned bolts with T-stub connections is needed to apply the pre-tensioning force in a bolt to an axis of force applied to the bolt and an interior surface parallel to the cross-section of the bolt (the section to which force is applied). The datum-axis command is used to create the force axis. To create the ...

Sensitivity analysis of pile settlement in clay by changing the geometric parameters of pile and soil resistance In this study, using Plaxis 3D Foundation finite element software, a sample of 4 concrete pile group in clay was modeled based on the modified geotechnical data of Monorail project in Kermanshah. The effect of changes in soil resistance parameters and geometry of the pile on the settlement level has been investigated. Due to the wide range of parameters, sensitivity analysis on the d...

The Optimization of Reinforced Concrete Cantilever Retaining Walls by Using the Firefly Algorithm (FA) In order to minimize the cost and weight of reinforcement cantilever concrete retaining walls, the optimization is performed by a new swarm intelligence algorithm that is called firefly algorithm (FA). This algorithm has been inspired from firefly behavior which search for food and find mates using bioluminescent communication. A computer program has been developed to investigate the capabilit...

In Tarzia, Int. Comm. in Heat and Mass Transfer, 25 (1998), 139–147, explicit formulas for the simultaneous determination of unknown thermal coefficients of a semi-infinite material through a phase-change process with temperature-dependent thermal conductivity were obtained. Moreover, ten different cases were studied: four cases of free boundary problems (i.e. Stefan-like problems) and six cases of moving boundary problems (i.e. inverse Stefan-like problems). The goal of this paper is to o...

Sensitivity analysis is a powerful technique used to determine robustness, reliability and efficiency of a model. The main problem in this procedure is the evaluating total sensitivity indices that measure a parameter’s main effect and all the interactions involving that parameter. From a mathematical point of view this problem is presented by a set of multidimensional integrals. In this work a simple adaptive Monte Carlo technique for evaluating Sobol’ sensitivity indices is develop...

In this paper, artificial neural network (ANN) and genetic algorithm (GA) were applied to observe the optimal practical conditions, i.e., adsorbent dosage, sonication time, MB concentration, Auramine-O (AO) concentrations, Er concentration as input parameters and % removal AO as output parameters. To enhance the adsorption of AO dye from ternary aqueous solutions containing AO, Erythrosine (Er) and Methylene Blue (MB) were rapidly performed onto the copper-doped zinc sulfide nanoparticles loaded...

Respirator comfort and fit are two important parameters for respirator design, usage, and standard development. The contact pressure (as measured between a respirator and the wearer) plays an important role in comfort and fit. This work attempts to investigate the contact mechanism and factors that affect the contact pressure. This paper focuses on mechanical factors such as strap tension, strap orientation, strap location, friction, and seal material. A finite element (FE) model-based method wa...

In this paper we propose a method for constrained shape optimization governed with a nonlinear axisymmetric magnetostatic state problem and we apply it to an optimal shape design of an electromagnet. The state problem is solved via Hiptmair’s symmetric coupling of finite elements employed in the interior ferromagnetic domain and boundary elements modelling the exterior air domain as well as current excitations. As a novelty we derive Duffy regularization transforms of the boundary element ...

A limit of statistical energy analysis (SEA) is that of providing only the mean values of the mechanical energy of a vibrating system. In this paper, the variability of SEA solution under uncertain SEA parameters (coupling loss factors, internal loss factors and injected powers) is investigated by comparing a sensitivity approach and a design of experiment (DoE) approach. Uncertainties of the SEA parameters depend on uncertainties in the physical properties of the considered mechanical system. N...