Advanced Improved Performance Research Integration Tool (IMPRINT) Vetronics Technology Test Bed Model Development

2003 ◽  
Author(s):  
Diane K. Mitchell
Keyword(s):  
Model Development ◽  
Test Bed ◽  
Research Integration ◽  
Improved Performance ◽  
Performance Research

Oscillations in self-aware networks

2008 ◽  
Vol 464 (2096) ◽  
pp. 2169-2185 ◽  
Author(s):  
Michael Gellman
Keyword(s):  
Adaptive Routing ◽  
Test Bed ◽  
Time Dynamic ◽  
Multiple Flows ◽  
Pros And Cons ◽  
Improved Performance ◽  
Store And Forward ◽  
Packet Flows ◽  
Distributed Reinforcement

Adaptive routing is once again of interest owing to the possibility to couple online probing in networks with real-time dynamic and distributed control of paths and flows. Wireless networks, with their rapidly changing network conditions also create a need to revisit this issue. This paper uses measurements in a wired adaptive network test bed, the cognitive packet network (CPN), to investigate the pros and cons of adaptive routing. CPN routes packet flows through a store and forward network according to their quality of service (QoS) needs through an online distributed reinforcement learning mechanism. This paper investigates routing oscillations that occur due to the interaction of multiple flows and studies their effect on QoS in the context of CPN. Our results indicate that routing oscillations can be easily controlled by randomizing the route switching, and that from an overall QoS viewpoint increased switching can also lead to improved performance.

Mechanistic Model for Spade Drills for Wood Drilling Operations, Part 1: Model Development

2003 ◽  
Vol 125 (2) ◽  
pp. 226-235 ◽  
Author(s):  
Hanxin Zhao ◽  
Kornel F. Ehmann
Keyword(s):  
Model Calibration ◽  
Prediction Models ◽  
Mechanistic Model ◽  
Model Development ◽  
Calibration Method ◽  
Technical Literature ◽  
Force System ◽  
Force Prediction ◽  
Drilling Operations ◽  
Improved Performance

The purpose of this work is to present an investigation of the force system generated during spade drill-bit drilling processes that is a prerequisite for the design of spade-drills with improved performance. The technical literature offers no references to this type of bit and process; hence an approach based on the well-established mechanistic force prediction methods will be used. The force and torque prediction models are based on a complete analytical model of a generalized spade bit that takes into account the cutting action of all the characteristic cutting edges of the spade bit, namely of its chisel edge, tip and major cutting edges. In conjunction with the model an efficient model calibration method is also introduced and experimentally verified.

Engaging Differences: How Socially Diverse Organizations Can Mobilize Their Resources More Effectively

Social Forces ◽  
2020 ◽  
Author(s):  
Brad R Fulton
Keyword(s):  
Social Interactions ◽  
Qualitative Data ◽  
Organizational Outcomes ◽  
Leadership Team ◽  
National Study ◽  
Social Differences ◽  
Multiple Measures ◽  
Cultural Activities ◽  
Improved Performance ◽  
Performance Research

Abstract Diversity is a goal for many organizations, yet it is not always connected to improved performance. This study advances diversity-performance research by examining the effect of engaging social differences. The analysis uses data from a national study of organizations containing information on the race, gender, class, and religion of each organization’s leaders as well as information on the type and content of interactions occurring among them. The data also contain multiple measures of organizational output, specifically the organization’s performance in forming alliances, developing strategies, organizing constituents, and mobilizing people. The analysis focuses on organizations with a diverse leadership team, examining the teams’ social interactions to assess whether engaging members’ social differences is associated with better performance. Additionally, qualitative data illustrate how engaging social differences impacts organizational outcomes. The study finds that teams whose members regularly participate in bridging cultural activities and discuss their social differences achieve greater output. Overall, this study indicates that an organization’s ability to realize the performance benefits of having a diverse leadership team is related to how the leaders interact with each other. The findings suggest that diverse organizations can improve their performance by ensuring that their members interact in ways that engage their social differences.

Mathematical Model Development of TMM25-Single Shaft Turbojet Engine

2012 ◽  
Vol 225 ◽  
pp. 267-272
Author(s):  
Khaled I. Azzabi ◽  
Aiman Elmahmodi
Keyword(s):  
Mathematical Model ◽  
Model Development ◽  
Development Stage ◽  
Test Bed ◽  
Nonlinear Mathematical Model ◽  
Significant Saving ◽  
Engine Design ◽  
And Control ◽  
Insight Into ◽  
Implementation Stage

A nonlinear mathematical model with thermodynamic relations permitting an accurate assessment of the dynamic influence on performance is developed in this study. The model is used within the framework of engine design in the development stage and in implementation stage. The use of simulations can give an invaluable insight into transient response and control problems; a significant saving is achieved with minimum test bed hardware development without endangering an engine. Successful simulations have been carried out using the proposed algorithm; an application utilizing Object Orientated Programming (OOP) was developed. The results obtained by the present developed model are in fair agreement with available experimental data.

scholarly journals Novel Fuzzy-Based Optimization Approaches for the Prediction of Ultimate Axial Load of Circular Concrete-Filled Steel Tubes

Buildings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 629
Author(s):  
Jinsong Liao ◽  
Panagiotis G. Asteris ◽  
Liborio Cavaleri ◽  
Ahmed Salih Mohammed ◽  
Minas E. Lemonis ◽  
...  
Keyword(s):  
Axial Compression ◽  
Structural Engineering ◽  
Model Development ◽  
Experimental Tests ◽  
Accurate Estimation ◽  
The Novel ◽  
Concrete Technology ◽  
Hybrid Techniques ◽  
Improved Performance ◽  
Concrete Filled Steel Tubes

An accurate estimation of the axial compression capacity of the concrete-filled steel tubular (CFST) column is crucial for ensuring the safety of structures containing them and preventing related failures. In this article, two novel hybrid fuzzy systems (FS) were used to create a new framework for estimating the axial compression capacity of circular CCFST columns. In the hybrid models, differential evolution (DE) and firefly algorithm (FFA) techniques are employed in order to obtain the optimal membership functions of the base FS model. To train the models with the new hybrid techniques, i.e., FS-DE and FS-FFA, a substantial library of 410 experimental tests was compiled from openly available literature sources. The new model’s robustness and accuracy was assessed using a variety of statistical criteria both for model development and for model validation. The novel FS-FFA and FS-DE models were able to improve the prediction capacity of the base model by 9.68% and 6.58%, respectively. Furthermore, the proposed models exhibited considerably improved performance compared to existing design code methodologies. These models can be utilized for solving similar problems in structural engineering and concrete technology with an enhanced level of accuracy.

scholarly journals Design of a cable-driven hyper-redundant robot with experimental validation

2017 ◽  
Vol 14 (5) ◽  
pp. 172988141773445 ◽  
Author(s):  
Lei Tang ◽  
Jungang Wang ◽  
Yang Zheng ◽  
Guoying Gu ◽  
Limin Zhu ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Mechanical Design ◽  
Load Capacity ◽  
Model Development ◽  
Joint Space ◽  
Kinematics Analysis ◽  
Test Bed ◽  
Real Time Control ◽  
Redundant Robot ◽  
Mechanism Model

This article presents a test bed for comprehensive study of a cable-driven hyper-redundant robot in terms of mechanical design, kinematics analysis, and experimental verification. To design the hyper-redundant robot, the multiple section structure is used. Each section consists of two rotational joints, a link mechanism, and three cables. In this sense, two degrees of freedom are achieved. For kinematics analysis between the actuator space and joint space, each section of the development is treated as three spherical–prismatic–spherical chains and a universal joint chain (3-SPS-U), which results in a four-chain parallel mechanism model. In order to obtain the forward kinematics from the joint space to task space directly and easily, the coordinate frames are established by the geometrical rules rather than the traditional Denavit–Hartenburg (D-H) rules. To solve the problem of inverse kinematics analysis, we utilize the product of exponentials approach. Finally, a prototype of 24-degrees of freedom hyper-redundant robot with 12 sections and 36 cables is fabricated and an experiment platform is built for real-time control of the robot. Different experiments in terms of trajectories tracking test, positioning accuracy test, and payload test are conducted for the validation of both mechanical design and model development. Experiment results demonstrate that the presented hyper-redundant robot has fine position accuracy, flexibility with mean position error less than 2%, and good load capacity.

scholarly journals Material Characterization of Candidate Silicon Based Ceramics for Stationary Gas Turbine Applications

1995 ◽  
Author(s):  
Vijay M. Parthasarathy ◽  
Jeffrey R. Price ◽  
William D. Brentnall ◽  
George Graves ◽  
Steven Goodrich
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Fatigue Testing ◽  
Composite Ceramics ◽  
Test Bed ◽  
Ceramic Components ◽  
Industrial Gas Turbines ◽  
Improved Performance ◽  
Silicon Based

The Ceramic Stationary Gas Turbine (CSGT) Program is evaluating the potential of using monolithic and composite ceramics in the hot section of industrial gas turbines. Solar Turbine’s Centaur 50 engine is being used as the test bed for ceramic components. The first stage blade, first stage nozzle and the combustor have been selected to develop designs with retrofit potential, which will result in improved performance and lowered emissions. As part of this DOE sponsored initiative a design and life prediction database under relevant conditions is being generated. This paper covers experiments conducted to date on the evaluation of monolithic silicon based ceramics. Mechanical property characterizations have included dynamic fatigue testing of tensile as well as flexural specimens at the temperatures representative of the blade root, the blade airfoil and the nozzle airfoil. Data from subcomponent testing of blade attachment concepts are also included.

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