Construction Of Simulation Model Research Articles

Numerical Analysis of the Liquid Crystalline Backflow-Driven Effect under a Continuous Square Wave Electric Field

In order to broaden the application range of liquid crystals, a new microfluidic drive and control method is proposed. Through a simulation model construction that links the plate motion and the liquid crystal backflow, we can study the coupling of the internal alignment and velocity fields of the liquid crystal in the model. On applying a continuous square wave electric field, the upper plate of the cell can be driven to move continuously, and the moving state can be related to the structure of the cell. When the gap between the two plates was 50 μm, the range of the change of tilt angle at the center of the cell was 6090°, and the induced backflow velocity profile was an S-shape. When the gap was 110 μm, because of the influence of the kickback effect, the range changed to 90100°, and the velocity profile was a double S-shape.

Conjoint Simulation of Active Suspension and ABS

A conjoint simulation of suspension system and brake system is proposed based on vehicle braking performance and ride stability. A half car simulation model is built applying the software of MATLAB in which the dynamic load is used to control the active force for suspension system and adjust parameter value of ABS (Anti-lock brake system). The suspension system and ABS construction of the half car simulation model is illustrated in detail. Using the simulation model, the braking distance, the stroke for suspension and the pitch angle of body are measured in three status which include the individually control for active suspension, the individually control for ABS and the integration control respectively. The simulation data show that the integral control method synchronously ensures braking stability and riding stability.

Gigacell grids: indulgence or necessity

Upscaling techniques developed in the late 1980s continue to form the basis of including detailed geological data in flow simulation models. While these techniques are theoretically robust, in practice the process of upscaling has variable success and the concept of replacing a complex and detailed geological model with an array of effective properties is considered to be a source of error in the construction of simulation models. The default ratio between the geological grid and the simulation grid in popular geological modelling programs is eight fine cells to one coarse cell. Examination of the number of samples required to estimate the mean value of a population suggest that this ratio should be much higher, and that more accurate upscaling results would be obtained if there were 1,000 fine cells in each coarse cell. This suggests that a simulation grid of 500,000 cells should have a corresponding geological grid with 500 million cells to improve the accuracy of the computation of effective properties. This is beyond the capabilities of the present generation of commercial geological modelling software used in the petroleum industry. This paper discusses the creation of gigacell grids, and the ease of construction and difficulties in population using existing geostatistical algorithms.

Using Scripts for the Construction of Management Simulation Models in the Context of Multi-Agency Engagement

Abstract — For a solo researcher barriers have existed in how group model building scripts can be easily facilitated for those participating from multiple agencies to engage in producing convincing models. Overcoming these barriers enables System Dynamics to reach prospective beneficiaries who may not have considered modelling as a means of addressing dynamically complex, multi-faceted issues that are widespread in community healthcare. This paper aims to improve script selection, achieving effective results for participants involved in validating multi-agent, policy alternatives. By studying targeted elicitation techniques from system dynamics and elsewhere, it is possible to shed light on how learning from scripts for modelling in system dynamics can inform other problem structuring methods for engaging management decision makers. Index Terms—Group model building, scripts pilot, multi-agency engagement. I. INTRODUCTION Failure to agree suitable scripts from a list of descriptions provided in versions of Scriptapedia [1] with gatekeepers spanning health and education agencies, indicated the need for an improved approach to multi-phased model construction for an emerging process. Gatekeeper unfamiliarity in selecting scripts, combined with script facilitation in practice by the principal researcher, were both contributing factors. Alongside such needs, the research faced elevated risk associated with combining modeler/ facilitator/ recorder roles within workshops and reducing this was considered paramount for research project success. The purpose of the case study is therefore to decide the best approach for synthesizing sympathetic interventions in child and adolescent mental health through existing providers and managers located in a large, English urban unitary authority. Specifically, the goals of modelling the case study include capturing comprehensive decision drivers alongside those deciding resource allocations from contributing agencies and investigating the mechanisms by which policy ambitions can be realized. The gap in knowledge is then used to support negotiation and agreement on how to best intervene in the system to reduce anxiety for those aged 11 when transferring between primary (elementary) and secondary (high) schools in the UK.

Методика построения имитационных моделей защиты информации в каналах передачи данных телеметрических систем

Методика построения имитационных моделей защиты информации в каналах передачи данных телеметрических систем

PRT simulation research

The paper presents analyses results of PRT vehicle driveability in a ¼ scale conducted with the application of a simulation model for a straight line driving conditions and when driving on a curve. The results of the present work will be used in the analysis of a physical motion model in a laboratory stand reflecting a railway system of the stand. The paper discusses the first stage of research in the process of virtual pre-prototyping which is to be finalized with the construction of a non-commercial vehicle prototype. In the construction of the simulation model, particular attention has been paid to three issues. First of all, a correct description of design features connected with the lack of so called centring mechanism – and not profiled tyred wheels independently embedded in the axes of the set. Secondly, a proper description of a turning mechanism with the use of a leading rollers system alongside the rail edge. Thirdly, the use of linear motor for the vehicle drive. The simulation model has been developed within MBS environment. For the description of tyred wheels, the library of TNO Delft Tyre has been used. Vehicle motion stability has been tested on the straight and curved track sections. The research has been financed within the framework of ECO mobility project.

An ontology-driven framework for enhancing reusability of distributed simulation modeling of industrial construction processes

This paper describes an ontology-driven framework for developing distributed simulation modeling of construction processes. The research described in the paper is motivated by the necessity of knowledge sharing between distributed simulation modeling collaborators, and reuse and portability challenges in construction simulation models. Our approach addresses these challenges through ontological modeling and linking of construction simulation modeling components including (i) ontology of construction process, (ii) ontology of simulation world view, and (iii) ontology of distributed simulation modeling application tool. Within the paper, ontology driven approach and mapping of ontologies for information transference between simulation components has been described. Another discussed application of ontologies is structuring of simulation modeling development through use of reusable elements. A large-scale distributed simulation model of industrial construction processes has been outlined to illustrate the application of the approach.

Research on Exaltation Mechanism of Absorptive Capacity about Cross-Border Mergers and Acquisitions Based on System Dynamics Analysis

Cross-border mergers and acquisitions process are complex organizational behavior of complex organizations. The existence of cultural barriers, technical barriers, organizational barriers and knowledge distance would affect directly or indirectly absorptive capacity in cross-border M&As, thus affect the performance of knowledge transfer and M&AS strategy. Under the cross-cultural, cross-organizational, cross-environmental background, it is critical to analyze objectively and systematically absorptive capacity status in cross-border M&AS. Absorptive capacity in cross-border M&AS is divided into latent absorptive capacity and actual absorptive capacity in the research. The essence of exaltation mechanism of absorptive capacity is a sort of complex dynamic process that enterprises employ the way of organizational learning to polymerize and couple the knowledge elements of M&AS. As the analysis and research methods on dynamic complexity of system, SD (system dynamic) could integrate organically qualitative and quantitative methods to employ computer simulation technique to construct simulation model to analyze systematically the evolution process and exaltation path, so as to find the discipline of formation and exaltation of absorptive capacity.

Simulation Model Construction and Analysis on Effects of Intellectual Property Protection for Enterprise Independent Innovation

Simulation Model Construction and Analysis on Effects of Intellectual Property Protection for Enterprise Independent Innovation

Network Analysis: An Integrative Approach to the Structure of Psychopathology

In network approaches to psychopathology, disorders result from the causal interplay between symptoms (e.g., worry → insomnia → fatigue), possibly involving feedback loops (e.g., a person may engage in substance abuse to forget the problems that arose due to substance abuse). The present review examines methodologies suited to identify such symptom networks and discusses network analysis techniques that may be used to extract clinically and scientifically useful information from such networks (e.g., which symptom is most central in a person's network). The authors also show how network analysis techniques may be used to construct simulation models that mimic symptom dynamics. Network approaches naturally explain the limited success of traditional research strategies, which are typically based on the idea that symptoms are manifestations of some common underlying factor, while offering promising methodological alternatives. In addition, these techniques may offer possibilities to guide and evaluate therapeutic interventions.

Mathematical Model of the Servo Drive with Friction Wheals. Simulations and Real Object Examination Results

In this paper the servo drive with friction wheels is presented. The servo drive is designed to move the automatic laparoscope tool or laparoscope camera (thereinafter laparoscope sleeve or sleeve) in two Degrees of Freedom (DOF). The description of the drive mechanism, operating principle and mathematical model of this drive is presented. Based on this model, the Control System (CS) has been created, and used to the construction of a simulation model. The simulation illustrates the proper functionality of the mathematical model of the servo drive with the described CS. This paper also presents the servo drive test stand and the most important examination results from the point of view of using them in the cardiac surgery Robin Heart robot.

F214 廃熱利用発電を目的とした再生ブレイトンサイクル機関の研究開発 : 性能解析モデルの構築と特性解析(OS10 外燃機関・廃熱利用技術(2))

F214 廃熱利用発電を目的とした再生ブレイトンサイクル機関の研究開発 : 性能解析モデルの構築と特性解析(OS10 外燃機関・廃熱利用技術(2))

Generating Irregular Models for 3D Spherical-Particle-Based Numerical Methods

The realistic representation of an irregular geological body is essential to the construction of a particle simulation model. A three-dimensional (3D) sphere generator for an irregular model (SGIM), which is based on the platform of Microsoft Foundation Classes (MFC) in VC++, is developed to accurately simulate the inherent discontinuities in geological bodies. OpenGL is employed to visualize the modeling in the SGIM. Three key functions, namely, the basic-model-setup function, the excavating function, and the cutting function, are implemented. An open-pit slope is simulated using the proposed model. The results demonstrate that an extremely irregular 3D model of a geological body can be generated using the SGIM and that various types of discontinuities can be inserted to cut the model. The data structure of the model that is generated by the SGIM is versatile and can be easily modified to match various numerical calculation tools. This can be helpful in the application of particle simulation methods to large-scale geoengineering projects.

Selective recovery of germanium with N-methylglucamine functional resin from sulfate solutions

Growing demand of germanium and uncertainties in supply create a need for research into efficient separation methods. Ion exchange recovery of germanium from sulfate solutions was studied with equilibrium experiments, column experiments, and modeling. Based on screening of four commercial resins by equilibrium experiments, a bifunctional N-methylglucamine resin was selected for dynamic adsorption studies and modeling. The adsorption of germanium onto the resin depended strongly on pH. The first pKa value of germanic acid, Ge(OH)4, is 9 and its anionic dissociation products (oxoanions) were adsorbed to the nitrogen containing groups by anion exchange mechanism. The germanium species were all adsorbed to glucose sites. Other metal ions in the studied multimetal feeds decreased the Ge adsorption directly by competition, and indirectly by acting as buffers to prevent pH increase and the dissociation of germanic acid. Iron was found to have a particularly detrimental effect on the adsorption.A competitive adsorption model was used to describe the sorption equilibrium of germanic acid and its dissociation products to glucose sites and to amine groups. A transport-dispersive model with a solid film linear driving force model was employed for the dynamic modeling. Authentic and simulated feed solutions were used to study the effect of competing metals. The feed solutions contained 63–490mg/L Ge and metal sulfates so that ionic strengths were between 0.58 and 5.82mol/L. The constructed simulation model predicted the equilibrium isotherms and the breakthrough curves of germanium well.

Simulation Model Construction of Comprehensive Evaluation of Groundwater Reasonable and Effectively Utilization in Tokyo, Japan

After 1970s, Japan has established relative laws and regulations to constraint industrial water, building water usage and forbidden unreasonable ground water exploitation which is caused by large amount of groundwater exploitation in 1960s. Such measures solved ground collapse problem on one hand indeed; on the other hand, along with the prevention of ground water exploitation, the groundwater level recovered to the normal level, and the floating power brought by groundwater rising threatened the architecture underground. The claim for groundwater utilization is rising. Also, groundwater has high value and good quality to supply water resource. Therefore, this research aims to construct a comprehensive groundwater exploitation model to clarify the sustainable groundwater utilization and economic, environmental impacts brought by groundwater usage. This new comprehensive model combined optimal groundwater exploitation model, water cycle model and socio-economic model together to practice optimal simulation. Through computer scenarios, we can clearly ensure groundwater utilization amount and method considering the sustainable development. Furthermore, the simulation model can be applied in other regions adjusting by specific characteristics.

Finite element modelling and simulations for golf impact

The objective of this study was to construct a finite element model of a golf ball and an impact simulation model between the ball and a club, and to devise a method for the construction of simulation models by investigating the factors affecting the behaviour of the ball during and after impact. A ball model with hyperelasticity and viscoelasticity was constructed using solid elements, and the relationship between the material properties and the ball behaviour at impact was revealed by varying several material constants of the ball model. A finite element model of a club with elasticity was created from a computer-aided design surface model of a commercially available driver. The club head and shaft were modelled using solid and shell elements, respectively. The effects of initial conditions at impact on the rebound behaviour of the ball, that is, the velocity, angle and spin rate, were investigated from impact simulations by varying the impact points of the ball and the postures of the club. Then, methods for the construction of simulation models were proposed based on these relationships. Impact experiments were also conducted to obtain the ball behaviour. The results simulated using the models, constructed by the proposed methods, closely matched the experimental results.

Performance Evaluation of Extended Aodv Using Different Scenarios

The mobile Ad Hoc networks have become a major component of the future network development due to their ease of deployment, self configurability; flexibility and independence on any existing network infrastructure Mobile ad-hoc network have the attributes such as wireless connection, continuously changing topology, distributed operation and ease of deployment. Routing protocol election in MANET (Mobile Ad Hoc Network) is a great challenge, because of its frequent topology changes and routing overhead. In mobile ad hoc network research, simulation plays an important role in determining the network characteristics and measuring performance. For this reason, constructing simulation models closer to the real circumstances is very significant. For widening the coverage area of the MANET there is a growing need to integrate these ad hoc networks to the Internet. For this purpose we need gateways which act as bridges between these two different protocol architectures. The gateway discovery in hybrid network is considered as a critical and challenging task. In this paper the AODV reactive routing protocol is extended to support the communication between the MANET and the Internet. We have carried out a systematic simulation based performance evaluation of the different gateway discovery approaches using NS2 under different network scenarios. The performance differentials are analyzed on the basis of three metrics – packet delivery fraction, average end to-end delay and normalized routing load.

소부대 전술 훈련을 위한 개체기반 워게임 모델과 전차시뮬레이터 연동에 관한 연구

In this thesis, we propose an integrated simulation method of virtual tank simulators and an entity-based constructive simulation model for small unit tactical training. To do this, we first identify requirements for virtual-constructive integrated simulation in a synthetic environment. We then propose a virtual and constructive interoperation method where individual combat entities of virtual-constructive models are interacting with each others. We develop a method of aggregating individual combat entities into a larger combat unit and disaggregating an unit into entities from time to time. We also present a way of sharing synthetic environment information between the models. Finally, we suggest that for more effective interoperability, virtual and constructive models should be developed by using common combat object models. The proposed interoperation method can be extended to further live-virtual-constructive models.

The Research of the Asynchronous Motor Vector Control Arithmetic

This paper is based on analysis of mathematical model of the induction motor and the basis of the asynchronous motor vector control principle puts forward a torque of inner closed-loop speed, flux vector control system of induction motors. Using Matlab/Simulink construct simulation model and the simulation results are analyzed.

Realization of NURBS Surface CNC Machining Simulation in Matlab

This paper presents a method of realization of NURBS surface CNC Machining simulation in matlab, including NURBS surface production, tool path generation, discrete surface and simulation model construction and CNC machining simulation realization.