Modeling And Simulation Research Articles

Poster Section 13: Modelling and Simulation

Poster Section 13: Modelling and Simulation

Three-dimensional biomechanical modeling and simulation of trephine cutting cornea for keratoplasty.

Trephination is one of the basic operations of keratoplasty, and the biomechanical mechanism of the operation can be revealed based on three-dimensional modeling and simulation of trephine cutting cornea. Based on the analysis of the physical and biomechanical characteristics of corneal trephination, a three-dimensional numerical model of corneal trephination is built, where the cornea can be simplified to two layers structure including stroma and epithelium, and the trephine cuts the cornea under the vertical motion load and the rotational motion load. A three-dimensional failure criterion of corneal material is proposed based on the yield strength theory. On this basis, trephination simulation is carried out, and the units of corneal material are removed from the model when they meet the defined failure criterion. Under the given parameters including the velocity, the angle and the angular velocity, the trephine force curves, include the linear cutting force and the rotary cutting force are obtained, and show the change of the forces with displacement during the process of trephination simulation. The maps of the equivalent stress show the destruction and deformation of the cornea. Then, the experiment of robotic trephination is carried out under the same parameters and the effectiveness of the simulation is evaluated. Based on mechanics theory and finite element method, the process of trephine cutting cornea has been reproduced, and the interaction mechanism is revealed, which lays the foundation for the development of real-time simulation and virtual system of the corneal surgery.

Modelling and simulation of system-of-systems using P-systems theory

Modelling and simulation of system-of-systems using P-systems theory

Effect of Radial Resistance Gap on the Pressure Drop of a Compact Annular-Radial-Orifice Flow Magnetorheological Valve

A compact annular-radial-orifice flow magnetorheological (MR) valve was developed to investigate the effects of radial resistance gap on pressure drop. The fluid flow paths of this proposed MR valve consist of a single annular flow channel, a single radial flow channel and an orifice flow channel through structure design. The finite element modelling and simulation analysis of the MR valve was carried out using ANSYS/Emag software to investigate the changes of the magnetic flux density and yield stress along the fluid flow paths under the four different radial resistance gaps. Moreover, the experimental tests were also conducted to evaluate the pressure drop, showing that the proposed MR valve has significantly improved its pressure drop at 0.5 mm width of the radial resistance gap when the annular resistance gap is fixed at 1 mm.

Modeling and Simulation of Hydrogen Behavior in Tungsten

Modeling and Simulation of Hydrogen Behavior in Tungsten

Modelling of an ozonation process for cyanide removal from blast furnace gas-washing water and analyses of process behaviour in different scenarios

In the steel sector, the control of cyanide in the wastewater of the gas washing system of blast furnaces is one of the main issues related to the wastewater quality. Although established treatment processes exist, the relevant costs, the stringent environmental regulation and the extremely complex and variable composition of gas washing water lead to investigate modifications of current treatments and to develop new ones. A cyanide treatment based on ozonation is one of the proposed and experimented methods within the European project “DynCyanide”. Starting from experimental data, a process model was developed through Aspen Plus® v.8.6, in order to test a wide range of operating conditions and wastewater features and to prove the robustness of the proposed process. The paper focuses on the process modelling and simulation phases. Water stream and ozonation are modelled through a number of theoretical reactors, by considering main and collateral reactions and a genetic algorithm is applied in order to reproduce at best the kinetics of these reactions. The validated model was applied for scenario analyses. Process knowledge was enhanced and, after finding the parameters and the compounds that reduce the ozonation efficiency, suggestions were obtained to improve the treatment performances. A temperature of 30°C and an initial pH value of 10 favour the cyanide ozonation; the batch mode of the treatment allows the removal of cyanide after 4.5 hours (3 cycles) using a limited ozone amount. If the wastewater contamination level is higher, a further cycle or a higher amount of ozone are needed.

Rate-based modelling and simulation of large-scale co2 capture using a piperazine-promoted aqueous ammonia solution

Rate-based modelling and simulation of large-scale co2 capture using a piperazine-promoted aqueous ammonia solution

Analysis of FBG process through modeling and simulation

Analysis of FBG process through modeling and simulation

882P - Potential impact of avelumab+axitinib (A+Ax) on tumor size (TS) compared with historical data of sunitinib (S) as evaluated by a modeling and simulation (MS) approach

882P - Potential impact of avelumab+axitinib (A+Ax) on tumor size (TS) compared with historical data of sunitinib (S) as evaluated by a modeling and simulation (MS) approach

Executive design and hermeneutics of téchne

The study concerns the contribution of technique towards the definition of the “executive” design, according to the connections with the conceptual apparatus aimed at defining the procedures and tools, both theoretical and practical, for the necessary knowledge and action within the production and construction environment. The analysis describes the work of “mediation” of technique towards the exploration of reality, according to the processes of “transcendence” and “artificial reproduction” supporting the modelling and simulation practices of the executive experience. Furthermore, the analysis focuses on the instrumentality introduced in the project by technique, with the aid of “executive models” pointing towards the anticipation and the “rational estimate” (by means of “pro-duction” and “operational representation” criteria).

Modelling and Simulation of a Transformer With Inter-turn Fault Including Saturation Effect and Variable Fault Parameters

Modelling and Simulation of a Transformer With Inter-turn Fault Including Saturation Effect and Variable Fault Parameters

Comparison of Different Types of Carbamate Amine for Stripping Process

Amine absorption process is an approach for mitigation of carbon dioxide (CO2) from flue gas that was produced from the power plant. Modelling and simulation of amine absorption process for CO2 removal at macro-scale is well established. This study aims to investigate different carbamate molecules for the regerenation process using molecular dynamic (MD) simulation. MD simulation was installed in the HP240 workstation using the software of Material Studio (version 7.0). The MD simulation was carried out at mole, volume, energy (NVE) (200 ps) and mole, volume, temperature (NVT) (1 ns) ensemble. Condensed-phase Optimized Molecular Potentials for Atomistic Simulation Studies (COMPASS) and Ewald models were used for the force field and summation method calculation within the simulation box. The simulation results show that, the carbamate ions of monoethanolamine (MEA) were difficult to break compared to 2-amino-2-methyl-1- propanol (AMP) and piperazine (PZ) for inter- and intra-molecular interactions on the stripping process. The high tendency for inter- and intra-molecular interactions happened on AMP and PZ, making them good choices to be blended with other amine solvent to overcome the limitation of other less reactive amines. The simulation results obtained from this study gave the fundamental explanation on the experimental and simulations results reported in the literature. The application of MD simulation in amine absorption process is capable to improve the understanding and give insight about this process at molecular level.

モデリング&シミュレーションにおけるV&Vの概要と規格化

モデリング&シミュレーションにおけるV&Vの概要と規格化

Dual Fuel Generator Modeling and Simulation for Development of PMS HILS

Dual Fuel Generator Modeling and Simulation for Development of PMS HILS

Modeling and simulation of multi-axle vehicle powertrain system

Modeling and simulation of multi-axle vehicle powertrain system

Component-based multi-resolution dynamic structure modeling and simulations

Component-based multi-resolution dynamic structure modeling and simulations

ChemInform Abstract: Modeling and Simulations in Photoelectrochemical Water Oxidation: From Single Level to Multiscale Modeling

AbstractReview: [95 refs.

Dynamic modeling and simulation analysis of robot driver's mechanical legs

Dynamic modeling and simulation analysis of robot driver's mechanical legs

Modeling and simulation of gear shifting in clutchless coupled motor-transmission system

Modeling and simulation of gear shifting in clutchless coupled motor-transmission system

Modeling and simulation of trabecular pattern formation in a cancellous bone defect under mechanical forces.

Understanding regeneration of the trabecular structure in cancellous bone defects is an important issue in bone tissue engineering and regenerative medicine. Biochemical and biomechanical viewpoints are indispensable for understanding the fundamental mechanism that underlies the regeneration of the trabecular structure. In vitro observations of the Turing pattern-like bone differentiation into osteoblasts from human mesenchymal stem cells suggest that mathematical modeling and simulation based on a reaction-diffusion system model would help us to understand the mechanism of trabecular pattern formation during cancellous bone regeneration. In this article, we propose a mathematical model of trabecular morphogenesis based on the reaction-diffusion system in 3D, which comprises activators and inhibitors of bone formation by combining with mechanical factors. Based on the proposed model, we conduct computational simulation of trabecular regeneration in a cancellous bone defect using a voxel-based finite element method for stress analysis and a finite difference method for reaction-diffusion analysis. The proposed model could express the regeneration of the three-dimensional trabecular structure with mechanically adapted functions as a load-bearing structure. Based on these results, the proposed model and simulation framework are expected to facilitate the analysis of regeneration of the cancellous bone;this will help us to examine bone regeneration that involve complex biological factors.