Papers by Keyword: System Modeling

Abstract: Flared natural gas emissions are one of the main sources of environmental pollution and global warming. To recover this gas, the presence of impurities like CO₂ in high concentrations forces oil producers to escape from investing in such intensive processing. Several implementations of no flaring methods have been reported in the literature, however, there have been limited concerning the bulk-CO₂ natural gases. This research developed an innovative idea for the use of the SOFC CHP system to recover flared bulk-CO₂ associated gas of Neem-Field in Western Sudan. The exergy of the system and the performance of the SOFCs are investigated in this paper, in addition to environmental and economic analysis. The simulation (Cycle-Tempo^©) results demonstrate that the proposed system can generate 1 MW electrical power and 0.068 MW thermal energy with efficiency approached 43.3% (based on LHV). The exergy analysis showed that 38% of system losses occurred in the air preheaters. Instead of conventional gas-burning, recovering the flared gas reduced the equivalent CO₂ GHGs emissions by 80%. Overall, the novel solution found to be environmentally friendly, and economically appealing with a total capital investment estimated to be US$1.175 million and a cost of electricity (COE) of 4.07 cents per kWh.

Abstract: The aim of this research is to develop a mathematical model of a compression ignition engine using cylinder-by-cylinder model approach to predict the performances; indicated work, indicated torque, in-cylinder pressures and temperatures and heat release rates. The method used in the study is based on ideal diesel cycle and is modified by the numerical formulations which affect the performance of the engine. The model consists of a set of tuning parameters such as engine geometries, EGR fractions, boost pressures, injection timings, air/fuel ratio, etc. It is developed in Simulink environment to promote modularity. A single-zone combustion model is developed and implemented for the combustion process which accounts for ignition delay, heat release. Derivations from slider-crank mechanism are involved to compute the instantaneous volume, area and stroke at any given crank angle. The results of the simulation model have been validated with experimental results with a close match between them.

Abstract: In this research work, the analysis of a parallel structure, hexapod type, was studied from the rigidity point of view. The modelling of the structure and the assembly were designed in SolidWorks one of the most used software for the design in the construction of machine tools, automotive and aeronautics field. The modal, the static analysis, forces and moment loading, were performed with ANSYS programme by finite element method, for each of the three studied positions of the structure.

Abstract: Remote instrumentation and measurement has always been an attractive area to researchers. Studies on grid-enabled instrumentation system have turned many instruments into resources similar to the computing and storage element. However, the advent of cloud computing further inspires the idea of instrumentation service provision rather than resources. Upon this philosophy, this paper proposes an architecture for instrumentation cloud aiming at guiding the development of the unified platform for remote instrumentation resources management and service provision. The design of the architecture is based on the analysis of requirements for future remote instrumentation system. Then, the use case and related activities of the instrumentation cloud system are derived. The detailed architecture and related function modules are designed according to previous system modeling. Finally a discussion is presented to analyze the potential problems that may encounter in developing the instrumentation cloud. However, most of them are just technique issues and can be solved once technology improves. The proposed architecture is a good guide for future development of on-cloud instrumentation system.

Abstract: A kind of design scheme of PTZ control system based on DC torque motor was proposed to improve fast tracking ability and tracking accuracy of moving target. The mathematical modeling methods for each link were given and the parameters were determined with the help of engineering design method. The simulation results showed that the system had higher location accuracy, better tracking performance and could satisfy the design request.

Abstract: This paper proposes a framework of modeling, analyzing, and controlling systems represented by interdependent physical laws, logic rules, and operating constraints, denoted as hybrid system. Based on the basic concept and characteristics of hybrid system, we classify the conventional models including hybrid automaton, hybrid Petri nets, mixed logic dynamics, et al. We introduce the method of stability analysis, and point out the main difficulties in optimization and control of hybrid systems. Finally, the further research directions are prospected.

Abstract: The cooperator’s optimal selection is a difficulty in manufacturing supply chains, but the complex networks developed rapid recent year provide us a new method. It proposed a probability distribution model for optimal selecting cooperator in supply chains. Analyzed the growth of Manufacturing Supply Chain Network Relationship Graph (MSCNRG) firstly, and put forward a probability distribution function consisted with degrees, relationships and conditions of the vertices; some experiments were carried out to check the model. The results of probability distribution model provide a novel method to analyze the optimal selecting cooperators in supply chains.

Abstract: Targeting the current status of cutting tool design long cycle and inefficient, this research presents an integrating system of cutting tool design (CAD) and simulation (CAE). First, the paper proposes the system architecture and analyzes the process. And then based on the architecture, the system prototype integrating SIEMENS NX and ANSYS is developed on the Visual Studio 2008 platform. The prototype can generate cutting tool 3D model on SIEMENS NX and continue to simulate on ANSYS based on the information from users. Finally, a kind of ball end mill is presented to certificate this system.

Abstract: The wide bandwidth and high amplitude feature of the beating heart motion makes surgeon hard to achieve the coronary artery bypass graph surgery on his or her own. The robot could help to cancel the relative motion between the end effecter of the robotic tool and certain point on the heart surface. Therefore a stationary operation screen could be used for the surgeon. The precise robot modeling is the prerequisite for tracking control algorithm. In the paper, we process the input and output data by using the nonlinear optimization method to obtain the system model. Next, we discuss the system identification related problems and modify the model. Finally, a good system model is achieved.

Abstract: The ultrasonic motor is a complex dynamic system, which be divided into an electro-mechanical coupling system and a drive and control system. The core of the electro-mechanical coupling system lies in excitation of elliptical movement of the mass points on the surface of the stator and frictional transfer of the power and the movement. Modeling of the electro-mechanical coupling dynamic system of the ultrasonic motor substantially comprises two aspects. First, the dynamic system is viewed as an integral transfer function, and an intuitive relationship between input of the electric energy and output of the power is established. Second, geometric parameters and material parameters of mechanisms are closely correlated with dynamics of the mechanisms.