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2020

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Articles 3271 - 3300 of 10642

Full-Text Articles in Engineering

Review On Interoperability Of Command Information System And Combat Simulation System, Zaijiang Tang, Xiangzhong Xu, Xue Qing, Haohua Xu Aug 2020

Review On Interoperability Of Command Information System And Combat Simulation System, Zaijiang Tang, Xiangzhong Xu, Xue Qing, Haohua Xu

Journal of System Simulation

Abstract: The interoperability of command information system and combat simulation system is an important and difficult problem of building practical training environment. The four aspects of interoperability connotation were summarized. The demands of interoperability were analyzed. The status and development of interoperability, especially for C4ISR/Sim Technical Reference Model (TRM), Battle Management Language (MBL), Levels of Conceptual Interoperability Model (LCIM) were studied. The existing problems were summarized, and four kinds of solutions were proposed. The general technical framework of interoperability based on service oriented architecture was designed, and the interoperability solving method based on Ontology was given.

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Total Least-Squares Algorithm For Wiener Errors-In-Variables System Modeling, Ziyun Wang, Zhicheng Ji Aug 2020

Total Least-Squares Algorithm For Wiener Errors-In-Variables System Modeling, Ziyun Wang, Zhicheng Ji

Journal of System Simulation

Abstract: The modeling problem of Wiener errors-in-variables systems was investigated where measurements of the system input and output were corrupted by the additive white Gauss noise. After the provided reformulation of the errors-in-variables system, a two-stage algorithm was developed to estimate the unknown parameters with the first stage employing the total least-squares algorithm, followed by a singular value decomposition in the second stage. The asymptotic maximum likelihood estimation property under the PE condition was strictly proven that with data length tends to infinite, and the proposed total least-squares solution provided an asymptotic maximum likelihood estimate for the nonlinear system parameter …

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Molecular Dynamics Of Fluid Properties By Normal Oscillations Of Solid Wall, Haijun Dong, Xiaoqing Lu, Haopeng Zhang, Mingming Shan Aug 2020

Molecular Dynamics Of Fluid Properties By Normal Oscillations Of Solid Wall, Haijun Dong, Xiaoqing Lu, Haopeng Zhang, Mingming Shan

Journal of System Simulation

Abstract: The fluid properties under the condition of the solid wall normal oscillations were studied using the molecular dynamics method. The two dimensional Couette flow model made up of copper wall and argon fluid was built. The fluid state of the near wall was simulated under the different oscillation parameters of solid wall and the corresponding fluid velocity field, the density distribution, the potential energy curves and the friction force were obtained. Then the influence mechanism of the wall oscillations on the frictional drag at liquid-solid interface was investigated. The results indicate that the frictional drag between wall and fluid …

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Novel Method To Identify Pmsm Parameters Based On Multiple Linear Regressive Models, Zhenwei Shi, Zhicheng Ji Aug 2020

Novel Method To Identify Pmsm Parameters Based On Multiple Linear Regressive Models, Zhenwei Shi, Zhicheng Ji

Journal of System Simulation

Abstract: A New Coupled Recursive Least Squares (C-FF-RLS) Algorithm with a forgetting factor was proposed for the Parameters Identification of Permanent Magnet Synchronous Motors (PMSMs). The deduced multiple linear regressive models of PMSM were proposed that were simple and appropriate for parameter identification. The C-FF-RLS identification algorithm had a high computational efficiency and a fast convergence speed because which Avoided the Matrix Inversion Operation in the Gain Matrix Compared with the Traditional Multivariable Recursive Least Squares (M-FF-RLS) Algorithm with a Forgetting Factor. The Proposed Identification Algorithm was applied on a simulation system of PMSM. The identification results achieved by …

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Guidance Simulation Credibility Evaluation Based On Clustering With Grey Cloud And Entropy Weight, Wang Fei, Xiaogeng Liang, Guo Chao, Peipei Li Aug 2020

Guidance Simulation Credibility Evaluation Based On Clustering With Grey Cloud And Entropy Weight, Wang Fei, Xiaogeng Liang, Guo Chao, Peipei Li

Journal of System Simulation

Abstract: Considering the problems of randomness and fuzziness in evaluating indexes from guidance simulation system, a novel grey clustering comprehensive evaluation model combined with center normal grey cloud whitening function and combination weighting function was presented. The comprehensive credibility evaluation index system for guidance simulation was built. The subjective weight vector of indexes was established by weighting cloud model based on analytic hierarchy process, the objective weight vector of indexes was obtained by entropy weighting method based on the entropy and classified distinction of the normal grey cloud whitening function, then the comprehensive weight vector was acquired by fusing the …

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Modeling And Analysis Of Command Control System Based On Devs, Xinlong Li, Xiang Mao Aug 2020

Modeling And Analysis Of Command Control System Based On Devs, Xinlong Li, Xiang Mao

Journal of System Simulation

Abstract: A comprehensive discussion was made on the application of DEVS theory in the modeling of command control (C2) system, which introduced the mathematical model of DEVS, gave the principle of using DEVS to model the C2's behavior and analyze how capability-requirement-measurements effected the simulation. The process and approach of DEVS-Modeling battalion's C2 system were introduced.

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Research On Live Migration Scheduling Method For Communication Network Simulation System Based On Vmotion, Yanfang Fu, Gao Xiang, Cheng Bing, Xueyao Feng Aug 2020

Research On Live Migration Scheduling Method For Communication Network Simulation System Based On Vmotion, Yanfang Fu, Gao Xiang, Cheng Bing, Xueyao Feng

Journal of System Simulation

Abstract: In order to make the quality of the simulation service not being affected by load dynamic changes, heuristic scheduling algorithm was proposed. Using the VMotion technology, the virtualization simulation platform was created by calling the SDK. Through the research of the simulation platform application overhead and virtual resource scheduling technology, the single communication network simulation model was modified, implementing the distributed network collaborative simulation which adapted to multiple virtual machines, providing new ideas for the mass communication network simulation system.

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Design Of Navigation Electronic Interference System For Flight Simulator, Zengbo Zhou, Chen Xi, Zhenyu Sun, Li Xiang Aug 2020

Design Of Navigation Electronic Interference System For Flight Simulator, Zengbo Zhou, Chen Xi, Zhenyu Sun, Li Xiang

Journal of System Simulation

Abstract: Modern military combat pays more attention to the electronic interference and anti interference, as the important component, the aircraft navigation system is one of the main objects attacked by enemy electronic jamming. In order to simulate the electronic jamming influence on navigation performance of the system, the establishment of an electronic jamming system in aircraft engineering simulator, was designed for the flight simulator interference model and statistical model frame work, and according to the integrity of the system testing and calculation results, the interference was divided into five levels, which not only specified the electrical interference, but also …

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Self Formation Development Mode With Vopes, Changming Fu, Chunsheng Long, Tang Hong Aug 2020

Self Formation Development Mode With Vopes, Changming Fu, Chunsheng Long, Tang Hong

Journal of System Simulation

Abstract: To solve the growing conflict between requirements and applications in simulation/visualization, self-formation development mode was proposed: domain experts DIY by WYSWYG in a self-adapting process. VOPES (Visual Open platform for Engineering System) was briefly introduced: integrated architecture, system modeling tools, visualization tools, automatic generation, debugging, deploying, and runtime infrastructure. VOPES enables domain expert to produce distributed simulation/visualization application, no need of coding, complex program skill, hard rules like UML, HLA, DDS, etc. VOPES can be widely used in applications like mission simulation, equipment demonstration, virtual range, training, ITEM. It is especially suitable to the fast, agile, complex simulation/visualization application, …

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Design Of Drilling Jumbo Simulation Training System Based On Vega Prime, Youcai Wang, Zilong Guo, Xinhai Xiang, Honghai Luan Aug 2020

Design Of Drilling Jumbo Simulation Training System Based On Vega Prime, Youcai Wang, Zilong Guo, Xinhai Xiang, Honghai Luan

Journal of System Simulation

Abstract: A drilling jumbo simulation training system was developed based on the Vega Prime in the MFC framework. The interactive communication control platform was built based on PCI bus, and then multithreading technology was adopted to achieving the Synchronous data communication between acquisition card and computer. A variety of modeling software was studied to aid Creator modeling method, and then the motion simulation of the drilling jumbo double-arm realization method based on DOF nodes was studied, which realized the real-time dynamic interaction of the system. By using the active 3d stereo imaging principle, the realization method of 3d stereo display …

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Boiler Combustion Optimization Based On Bayesian Neural Network And Genetic Algorithm, Haiquan Fang, Huifeng Xue, Li Ning, Fei Xi Aug 2020

Boiler Combustion Optimization Based On Bayesian Neural Network And Genetic Algorithm, Haiquan Fang, Huifeng Xue, Li Ning, Fei Xi

Journal of System Simulation

Abstract: Neural network and genetic algorithm have been extensively used in boiler combustion optimization problems. But the traditional Back Propagation neural network's generalization ability is poor. The Bayesian regularization can improve the neural network's generalization ability. A boiler combustion multi-objective optimization method combining Bayesian regularization BP neural network and genetic algorithm （Bayes NN-GA）was researched. A number of field test data from a boiler was used to simulate the Bayesian neural network model. The results show that the thermal efficiency and NOx emissions predicted by the Bayesian neural network model show good agreement with the measured, and the optimal results show …

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Attitude Control Of Three-Axis Flexible Satellite Based On Active-Disturbance-Rejection Sliding Mode Method, Yunjie Wu, Li Chen, Ma Zheng Aug 2020

Attitude Control Of Three-Axis Flexible Satellite Based On Active-Disturbance-Rejection Sliding Mode Method, Yunjie Wu, Li Chen, Ma Zheng

Journal of System Simulation

Abstract: By using Kane method, a mathematical model with CMGs as actuators was built for the three-axis satellite with flexible appendages. An active-disturbance-rejection sliding mode controller was designed for the demand about quickness and stability in attitude control. This controller observed the disturbance by expanded state observer, and compensated the output. The slide mode method in the controller made the system quick and stable. The simulation experiments show that the controller could control the attitude of three-axis satellite efficiently and weaken the vibration of flexible solar panel. The active-disturbance-rejection sliding mode controller shows the merits of both active-disturbance-rejection method …

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Least-Energy Maneuver Of Five-Link Manipulator Constrained Within Tunnel Space Using Direct Collocation, Xiuqiang Pan, Chengcai Mei, Junjie Chen Aug 2020

Least-Energy Maneuver Of Five-Link Manipulator Constrained Within Tunnel Space Using Direct Collocation, Xiuqiang Pan, Chengcai Mei, Junjie Chen

Journal of System Simulation

Abstract: Optimal control and designs least-energy maneuver control laws for a five-linked manipulator were applied in order to carry out designated tasks in a confined space. Lagrange-Euler equation described the relationships between the actuators and system dynamics. Euler-Lagrange formulation indicates how optimization can be achieved when optimum occurs. Direct collocation method was introduced in order to solve this highly nonlinear dynamic optimal control problem. Simulations were done to exploit how the manipulator reacted to the constraint. In this study, the diameter of the cylindrical space was shrunken each time by 0.1 meters. The value of the cost function and …

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Research Of Multi-Views Based Weapon And Equipment Simulation Model Architecture, Chunguang Peng, Jianhui Deng, Zhang Bo Aug 2020

Research Of Multi-Views Based Weapon And Equipment Simulation Model Architecture, Chunguang Peng, Jianhui Deng, Zhang Bo

Journal of System Simulation

Abstract: ：It's an important approach to build reasonable and complete simulation model architecture for promoting the simulation interoperability, establishing simulation model standards and promoting reusability of models and codes. Some problems existed in the research of simulation model architecture were analyzed. The weapon and equipment simulation model architecture describing method based on multi-views was brought out by using the system engineering theory, which emphasized on the complicated relations between modes and its environment. The method could describe simulation model architecture from different views of different users. Therefore, based on DoDAF and the popular software architecture, five-view models of weapon …

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Research On Equipment Operation Capabilities Requirements Based On Exploratory Simulation Experiment Methodology, Zongrui Yan, Yinhua Wu, Chen Yong, Jianshu Dong Aug 2020

Research On Equipment Operation Capabilities Requirements Based On Exploratory Simulation Experiment Methodology, Zongrui Yan, Yinhua Wu, Chen Yong, Jianshu Dong

Journal of System Simulation

Abstract: Analysis on equipment operation requirements is a very difficult problem which has included a lot of uncertain factors, and it can assist peoples to determine whether the equipment item should be started. Exploratory simulation experiment methodology which is synthetized by exploratory analysis and war fighting experimentation can provide a better service for many problems about the equipment demonstration. Through the summary on basic applications exploratory simulation experiments related out comes and its analysis for concrete implementation steps equipment demonstration areas, a tactical level exploratory simulation methodology and its concrete implementation steps were proposed for the operational requirements analysis. An …

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Research And Development Of Eicas System Emulator Based On Idata, Baoming Zhao, Hongshu Cheng, Cancan Liu, Jiying Li Aug 2020

Research And Development Of Eicas System Emulator Based On Idata, Baoming Zhao, Hongshu Cheng, Cancan Liu, Jiying Li

Journal of System Simulation

Abstract: Some modeling tools can't design simulation instruments efficiently and conveniently such as OpenGL, etc. A cockpit display development tool of IData was worked in which has graphical user interface and could develop a system easily and rapidly. IData is a method of designing maps and pictures, it can respond variables of application and controlling events in real time and develop graphical interface by clicking on the menu. So IData can reduce the time of graphic development and integration in simulation. In order to render maps in real time, IData used a powerful graphic editor to model for instruments, and …

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Diagnosis Of Aircraft Control Surface Fault Based On Semi-Physical Simulation, Yunlong Li, Xia Jie, Zifang Shi Aug 2020

Diagnosis Of Aircraft Control Surface Fault Based On Semi-Physical Simulation, Yunlong Li, Xia Jie, Zifang Shi

Journal of System Simulation

Abstract: The aircraft control surface defaults of rudders were mainly divided into jam fault and damage fault. On the basis of the relationship between motor toque and hinge moment, a new method of using the motor voltage was proposed to detect the control surface'faults of rudder. And the method could detect the damage degree of the faults. Torque motor was used to play the role of hinge moment. And the new method was simulated by Semi-Physical system which is consisted of dSPACE system, PC and simulated rudder actuator. The results show that, the damage faults and jam faults can be …

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On Creases And Curved Links: Design Approaches For Predicting And Customizing Behaviors In Origami-Based And Developable Mechanisms, Jared J. Butler Aug 2020

On Creases And Curved Links: Design Approaches For Predicting And Customizing Behaviors In Origami-Based And Developable Mechanisms, Jared J. Butler

Theses and Dissertations

This work develops models and tools to help designers address the challenges associated with designing origami-based and developable mechanisms. These models utilize strain energy, kinematics, compliant mechanisms, and graphical techniques to make the design of origami-based and developable mechanisms approachable and intuitive. Origami-based design tools are expanded through two methods. First presented is a generalized approach for identifying single-output mechanical advantage for a multiple-input compliant mechanism, such as many origami-based mechanisms. The model is used to predict the force-deflection behavior of an origami-based mechanism (Oriceps) and is verified with experimental data from magnetic actuation of the mechanism. Second is a …

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Linear And Nonlinear Dimensionality-Reduction-Based Surrogate Models For Real-Time Design Space Exploration Of Structural Responses, Gregory David Bird Aug 2020

Linear And Nonlinear Dimensionality-Reduction-Based Surrogate Models For Real-Time Design Space Exploration Of Structural Responses, Gregory David Bird

Theses and Dissertations

Design space exploration (DSE) is a tool used to evaluate and compare designs as part of the design selection process. While evaluating every possible design in a design space is infeasible, understanding design behavior and response throughout the design space may be accomplished by evaluating a subset of designs and interpolating between them using surrogate models. Surrogate modeling is a technique that uses low-cost calculations to approximate the outcome of more computationally expensive calculations or analyses, such as finite element analysis (FEA). While surrogates make quick predictions, accuracy is not guaranteed and must be considered. This research addressed the need …

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Research On Scenario-Driven Component-Based Model Composition Method, Jianchun Zhang, Fengju Kang Aug 2020

Research On Scenario-Driven Component-Based Model Composition Method, Jianchun Zhang, Fengju Kang

Journal of System Simulation

Abstract: To fulfil the requirements for fast, easy and integrated modeling under certain operation conditions, a model composition method of scenario-driven was proposed. Starting with corresponding composition framework, traditional component models were extended through corresponding meta-model and normalization description of scenario was given. Furthermore, a full combat simulation system could be constructed quickly by realizing integrated process including three processes: scenario parse, model search and match. By preliminarily performing underwater weapon system modeling and simulation application, the result shows efficiency of this composition method.

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Co-Designed Land-Use Scenarios And Their Implications For Storm Runoff And Streamflow In New England, Andrew John Guswa, Brian Hall, Chingwen Cheng, Jonathan R. Thompson Aug 2020

Co-Designed Land-Use Scenarios And Their Implications For Storm Runoff And Streamflow In New England, Andrew John Guswa, Brian Hall, Chingwen Cheng, Jonathan R. Thompson

Engineering: Faculty Publications

Landscape and climate changes have the potential to create or exacerbate problems with stormwater management, high flows, and flooding. In New England, four plausible land-use scenarios were co-developed with stakeholders to give insight to the effects on ecosystem services of different trajectories of socio-economic connectedness and natural resource innovation. With respect to water, the service of greatest interest to New England stakeholders is the reduction of stormwater and flooding. To assess the effects of these land-use scenarios, we applied the Soil and Water Assessment Tool to two watersheds under two climates. Differences in land use had minimal effects on the …

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Investigation Of Modeling Strategies For Slender Lightly Reinforced Concrete Shear Walls, Jenna Marie Williams, Tracy Destiny Doan Aug 2020

Investigation Of Modeling Strategies For Slender Lightly Reinforced Concrete Shear Walls, Jenna Marie Williams, Tracy Destiny Doan

Architectural Engineering: Graduate Reports

A large number of pre-1980’s non-ductile reinforced concrete (RC) structures in California utilizing RC shear walls to resist seismic lateral forces have been identified as deficient by industry practitioners. These non-ductile wall systems are typically lightly reinforced and lack adequate boundary element detailing. Analytical studies suggest these walls are susceptible to brittle, compression-controlled failure modes due to damage from concrete crushing and bar buckling. Furthermore, poor behavior of lightly reinforced concrete walls was observed in many recent earthquakes, for example in Chile (1985), New Zealand (2010/2011) and Mexico (2017). This has generated concern among engineers in high seismic regions around …

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Maleic Anhydride Compatibilized Peach Waste As Filler In Polypropylene And High Density Polyethylene Biocomposites, Caralyn Wong, Stephanie Jung, Joongmin Shin, Ajay Kathuria Aug 2020

Maleic Anhydride Compatibilized Peach Waste As Filler In Polypropylene And High Density Polyethylene Biocomposites, Caralyn Wong, Stephanie Jung, Joongmin Shin, Ajay Kathuria

Master's Theses

It is estimated that roughly 103, 515 tons of peach waste is produced annually in the US. The majority of the waste is disposed of in landfills, which contributes to climate change as they release 93 million metric tons of CO2 equivalent. Peach waste principally consists of remaining stone and seed after flesh removal. The agro-waste includes both cellulose and lignin, which can be utilized as a filler in plastic packaging to reduce carbon footprints and material cost. The objectives of this research are (1) to develop peach flour (PF)-filled biocomposites with a polyolefin matrix using maleic anhydride-g-high density …

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Microstructural And Mechanical Properties Of Alkali Activated Slag Concrete, Vighnesh Nayak Aug 2020

Microstructural And Mechanical Properties Of Alkali Activated Slag Concrete, Vighnesh Nayak

Manipal Institute of Technology, Manipal Theses and Dissertations

No abstract provided.

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Application Of Artificial Intelligence In The Design Of Pre-Engineered Buildings, Moahammed Sarthaz Aug 2020

Application Of Artificial Intelligence In The Design Of Pre-Engineered Buildings, Moahammed Sarthaz

Manipal Institute of Technology, Manipal Theses and Dissertations

Steel structures are widely growing in construction industry because of the low cost and time reduction in construction of a structure. Pre-engineered buildings, popularly known as PEB are Structures or components engineered at factory and then assembled at site. Computers have become indispensible in design offices because of their overall operation speed in design process. Designing in software helps reduce the design time and costs of project, if designers are well trained to use the software designs. The objective of this thesis is to develop nomograms for member end forces of single bay portal PEB frame by machine learning concept. …

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Accidental Torsion Effects On Buildings, Lakshmi M Aug 2020

Accidental Torsion Effects On Buildings, Lakshmi M

Manipal Institute of Technology, Manipal Theses and Dissertations

Accidental torsion is an important parameter that should be taken into account while designing structures. Torsion created because of the eccentricity between centre of mass and centre of stiffness that arises as a result of asymmetry in buildings is called as inherent torsion. Accidental torsion accounts for Non-uniform distribution of mass, stiffness and strength parameters which results in additional eccentricity which ultimately causes the building to rotate under seismic action and they have caused severe damage or collapse of structures in several past earthquakes. In the present study, response of structure due to accidental eccentricity is established by analyzing a …

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"Behavior Of Transmission Tower With Diaphragm System To The Wind Load And The Settlement Of Support Forces", Santosh M. Nayak Aug 2020

"Behavior Of Transmission Tower With Diaphragm System To The Wind Load And The Settlement Of Support Forces", Santosh M. Nayak

Manipal Institute of Technology, Manipal Theses and Dissertations

In recent years, with the increasing demands on electric power supply, it is very important to enhance the safety of power transmission line. Hence, considerable efforts have been made by different researchers to investigate the behaviour of power transmission towers under different loading and environmental conditions. One of the main cause for the failure of transmission tower is the strong wind load acting on the tower. Another reason for failure of the tower is settlement of support. The ground settlement will cause the incline of tower and distortion of tower leg, which will influence the capacity of towers suffering from …

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"Effect Of Modelling Podium Structure On The Overall Behaviour Of The Strcture In A Tall Building", Aditya Sehgal Aug 2020

"Effect Of Modelling Podium Structure On The Overall Behaviour Of The Strcture In A Tall Building", Aditya Sehgal

Manipal Institute of Technology, Manipal Theses and Dissertations

Podium surrounding tower walls are often widely preferred for multifaceted functionality of tall buildings. Horizontal offset buildings constitute a class of structures that are particularly prone to in-plane floor deformation and torsion occurring simultaneously. It is found from previous studies that podium can impose significant differential restraint on coupled tower walls. Amongst the different structural systems that are adopted world over, diaphragm with rigid and semi-rigid floor plate are adopted widely in the analysis. This research focuses on the backstay effect i.e. podium structural interaction with the tower area and consideration of retaining wall on all four sides and retaining …

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Negative-Triangularity Configuration On East: Analysis Of Engineering Limitations On Superconducting, D-Shaped, Target-Diverted Plasmas, David A. Weldon Aug 2020

Negative-Triangularity Configuration On East: Analysis Of Engineering Limitations On Superconducting, D-Shaped, Target-Diverted Plasmas, David A. Weldon

Graduate Theses - Electrical and Computer Engineering

Thermonuclear fusion is so named because of the high temperature that the majority of the fuel must maintain such that nuclei can overcome the electrostatic force, fuse, and produce energy. However, the ions and electrons (plasma) are so hot that any material used to confine them would be destroyed. To achieve confinement while maintaining the 50,000,000 K temperature needed for self-sustaining fusion, magnetic confinement is needed. As of 2019, the tokamak is the leading candidate for a practical fusion reactor. In recent years, tokamak research has repeatedly shown that the edge magneto-hydrodynamic stability is critical for handling the power to …

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Accuracy Comparison Of Aerial Lidar, Mobile-Terrestrial Lidar, And Uav Photogrammetric Capture Data Elevations Over Different Terrain Types, Mandar Khanal, Mahamudul Hasan, Nikolaus Sterbentz, Ryen Johnson, Jesse Weatherly Aug 2020

Accuracy Comparison Of Aerial Lidar, Mobile-Terrestrial Lidar, And Uav Photogrammetric Capture Data Elevations Over Different Terrain Types, Mandar Khanal, Mahamudul Hasan, Nikolaus Sterbentz, Ryen Johnson, Jesse Weatherly

Civil Engineering Faculty Publications and Presentations

Lidar and other remotely sensed data such as UAV photogrammetric data capture are being collected and utilized for roadway design on an increasing basis. These methods are desirable over conventional survey due to their efficiency and cost-effectiveness over large areas. A high degree of relative accuracy is achievable through the establishment of survey control. In this case study, elevations (z-values) derived from mobile-terrestrial lidar, aerial lidar, and UAV photogrammetric capture collected with survey control were statistically compared to conventionally surveyed elevations. A cost comparison of the methods is also included. Each set of z-values corresponds to a discrete horizontal point …

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