检索结果-内蒙古大学图书馆

41st Aerospace Sciences Meeting and Exhibit 2003

作者： Thompson, David S. Soni, Bharat K. Mississippi State University Department of Aerospace Engineering Computational Simulation and Design Center ERC MS 39762 United States Mississippi State University Department of Mechanical Engineering The University of Alabama at Birmingham MS 39762 United States

ISBN: (纸本)9781624100994

In this paper we describe the technology employed in the development of the integrated software package ICEG2D{a Navier-Stokes based ice accretion prediction code. ICEG2D provides a framework to couple the execution of its component modules with the ice accretion prediction code LEWICE and the flow solvers NPARC and WIND. The development philosophy was to rely on validated software whenever possible and implement techniques that required minimal changes to LEWICE, NPARC, and WIND. ICEG2D was designed to automatically perform five main functions: 1) generate a gridready surface definition based on the geometrical characteristics of the iced airfoil surface, 2) generate a high-quality structured grid starting from a surface definition, 3) generate the solver-dependent input files (for NPARC or WIND), 4) generate the input needed for the ice accretion prediction code LEWICE, and 5) generate a surface point distribution, grid, and NPARC or WIND initial/restart files in response to the deforming airfoil definition. The results generated using ICEG2D are compared with experimental data for representative ice shapes. © 2003 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Software packages

来源：评论

学校读者我要写书评

暂无评论

Motion design of a hybrid wheeled/legged robot for lunar exploration

引用

Journal of Harbin Institute of Technology(New Series) 2003年第3期10卷 246-249页

作者：陈学东田文罡李小清渡边桂吾 School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Dept. of Advanced Systems Control Engineering Saga University Japanhe robot consists of a quadruped mechanism and two active dual-wheel casters possesses the advantages of wheeled and legged mechanism and can quickly move on the relatively plane ground with the wheeled mechanism and can walk on the extremely uneven terrain with the legged mechanism. The effectiveness of the motion design of the hybrid robot is iHustrated by simulation results.

The robot consists of a quadruped mechanism and two active dual-wheel casters possesses the advantages of wheeled and legged mechanism, and can quickly move on the relatively plane ground with the wheeled mechanism, and can walk on the extremely uneven terrain with the legged mechanism. The effectiveness of the motion design of the hybrid robot is iHustrated by simulation results.

关键词： Lunar exploration robot Quadruped mechanism Mobile mechanism Hybrid wheeled/legged

来源：评论

学校读者我要写书评

暂无评论

Research on simulation and Test of the Nonlinear Responses for the Hydraulic Shock Absorber

引用

Journal of Donghua University(English Edition) 2003年第4期20卷 98-102页

作者：张建武刘延庆 School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 China School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 Chinaasically on the multi-body system dynamics the virtual prototype of the hydraulic shock absorber for the bench test is developed in the ADAMS environment. Dynamic behaviors of the absorber are studied by both computer simulation and real test. Numerical predictions of dynamic responses are produced by the established virtual prototype of the absorber and compared with experimental results. It has been shown from the comparison that the vibration behaviors of the prototype with hysteretic damping characteristics are considered to be more identical with the bench test results than those of the same prototype with piecewise linear damping properties are. The current virtual prototype of the shock absorber is correct and can be a developing terrace for the optimizing design of the absorber and matching capability of the whole car.

Basically on the multi-body system dynamics,the virtual prototype of the hydraulic shock absorber for the bench test is developed in the ADAMS *** behaviors of the absorber are studied by both computer simulation and real *** predictions of dynamic responses are produced by the established virtual prototype of the absorber and compared with experimental *** has been shown from the comparison that the vibration behaviors of the prototype with hysteretic damping characteristics are considered to be more identical with the bench test results than those of the same prototype with piecewise linear damping properties *** current virtual prototype of the shock absorber is correct and can be a developing terrace for the optimizing design of the absorber and matching capability of the whole car.

关键词： Shock absorber hysterctic damping Multi-body dynamics

来源：评论

学校读者我要写书评

暂无评论

design space visualization and its application to a design by shopping paradigm

Design space visualization and its application to a design b...

引用

2003 ASME design engineering Technical Conferences and Computers and Information in engineering Conference

作者： Stump, Gary M. Simpson, Timothy W. Yukish, Mike Harris, E. Nathan Applied Research Laboratory Pennsylvania State University University Park PA 16802 United States Dept. of Mechanical Engineering Pennsylvania State University University Park PA 16802 United States Prod. and Process Design Department Applied Research Laboratory Pennsylvania State University University Park PA 16802 United States Modeling and Simulation Lockheed Martin Space Systems Space and Strategic Missiles Denver CO 80201 United States

We have developed a data visualization interface that facilitates a design by shopping paradigm, allowing a decision-maker to form a preference by viewing a rich set of good designs and use this preference to choose an optimal design. design automation has allowed us to implement this paradigm, since a large number of designs can be synthesized in a short period of time. The interface allows users to visualize complex design spaces by using multi-dimensional visualization techniques that include customizable glyph plots, parallel coordinates, linked views, brushing, and histograms. As is common with data mining tools, the user can specify upper and lower bounds on the design space variables, assign variables to glyph axes and parallel coordinate plots, and dynamically brush variables. Additionally, preference shading for visualizing a user's preference structure and algorithms for visualizing the Pareto frontier have been incorporated into the interface to help shape a decision-maker's preference. Use of the interface is demonstrated using a satellite design example by highlighting different preference structures and resulting Pareto frontiers. The capabilities of the design by shopping interface were driven by real industrial customer needs, and the interface was demonstrated at a spacecraft design conducted by a team at Lockheed Martin, consisting of Mars spacecraft design experts.

关键词： Computer aided design

来源：评论

学校读者我要写书评

暂无评论

Computation of vortex-intensive incompressible flow fields

Computation of vortex-intensive incompressible flow fields

引用

32nd AIAA Fluid Dynamics Conference and Exhibit 2002

作者： Sreenivas, Kidambi Hyams, Daniel Mitchell, Brent Taylor, Lafayette Marcum, David Whitfield, David Computational Simulation and Design Center Engineering Research Center Mississippi State University Dept. of Mechanical Engineering MS 39762 United States Dept. of Aerospace Engineering Engineering Research Center Mississippi State University Dept. of Mechanical Engineering MS 39762 United States

ISBN: (纸本)9781624101137

The objective of this study is to use U2NCLE, an unstructured, parallel, Reynolds averaged Navier-Stokes solver, to compute vortex intensive flow fields and compare the results with experimental data. Vortex intensive flow fields arise under a variety of conditions. The ones considered in this study are those arising due to rotating propellers and due to flow past submarine hulls. The examples considered here involve computations at design as well as offdesign conditions for the propellers and the SUBOFF model at various angles of drift. Results are presented for propeller P-4381 (overall thrust and torque coefficients) as well as for propeller P-5168 (velocity profiles downstream of the propeller). Forces and moments are also compared for the SUBOFF hull at various angles of drift to experimental data. Good agreement with experimental data is obtained for the various cases. © 2002 by the author(s). Published by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Propellers

来源：评论

学校读者我要写书评

暂无评论

A parallel flow solver for unsteady multiple blade row turbomachinery simulations

A parallel flow solver for unsteady multiple blade row turbo...

引用

ASME Turbo Expo 2001: Power for Land, Sea, and Air, GT 2001

作者： Chen, J.P. Briley, W.R. ERC Computational Simulation and Design Center United States Mechanical Engineering Department Mississippi State University Mississippi State MS United States

ISBN: (纸本)9780791878507

A parallel flow solver has been developed to provide a turbomachinery flow simulation tool that extends the capabilities of a previous single-processor production code (TURBO) for unsteady turbomachinery flow analysis. The code solves the unsteady Reynolds-averaged Navier-Stokes equations with a turbulence model. The parallel code now includes most features of the serial production code, but is implemented in a portable, scalable form for distributed-memory parallel computers using MPI message passing. The parallel implementation employs domain decomposition and supports general multiblock grids with arbitrary grid-block connectivity. The solution algorithm is an iterative implicit time-accurate scheme with characteristics-based finite-volume spatial discretization. The Newton subiterations are solved using a concurrent block-Jacobi symmetric Gauss-Seidel (BJ-SGS) relaxation scheme. Unsteady blade-row interaction is treated either by simulating full or periodic sectors of blade-rows, or by solving within a single passage for each row using phase-lag and wake-blade interaction approximations at boundaries. A scalable dynamic sliding-interface algorithm is developed here, with an efficient parallel data communication between blade rows in relative motion. Parallel computations are given here for flat plate, single blade row (Rotor 67) and single stage (Stage 37) test cases, and these results are validated by comparison with corresponding results from the previously validated serial production code. Good speedup performance is demonstrated for the single-stage case with a relatively small grid of 600,000 points. Copyright © 2001 by ASME.

关键词： Iterative methods

来源：评论

学校读者我要写书评

暂无评论

Slit Die Optimisation Employing A Gradient Free Method

Slit Die Optimisation Employing A Gradient Free Method

引用

The Fourth World Congress of Structural and Multidisciplinary Optimization

作者： J.Sienz J.F.T.Pittman D.S.Langley Centre for Polymer Processing Simulation and Design ADOPT Research Group Departments of Mechanical and Civil Engineering University of Wales Swansea Singleton Park Swansea SA2 8PP UK Centre for Polymer Processing Simulation and Design ADOPT Research Group Departments of Mechanical and Civil Engineering University of Wales Swansea Singleton Park Swansea SA2 8PP UK Centre for Polymer Processing Simulation and Design ADOPT Research Group Departments of Mechanical and Civil Engineering University of Wales Swansea Singleton Park Swansea SA2 8PP UK

A brief review of the application of optimisation methods in conjunction with numerical simulation to design of extrusion dies for plastics and rubber is given. Following this, based on a simulation of slit die performance that takes into account the coupling of melt flow and die body deflection due to melt pressure, a genetic algorithm is applied to determine choker bar profiles to give optimum melt flow distribution. The software makes it possible to predict the practical operating range of dies in terms of melt flow properties and throughput.

关键词： optimization, slit die design, die body deflection

来源：评论

学校读者我要写书评

暂无评论

Probabilistic fatigue life prediction for ship structures using fracture mechanics

引用

NAVAL ENGINEERS JOURNAL 2000年第5期112卷 88-88页

作者： Gifford, LN Gilberto F. M. de Souza:is an assistant professor at the department of Mechanical Engineering at the University of São Paulo Brazil. He completed his B.S. and M.S. degrees in naval architecture and marine engineering in 1985 and 1990 respectively at the University of Sao Paulo and completed his Ph.D. degree in mechanical engineering in 1994 at the University of São Paulo. He is also a visiting scholar in the Center of Technology and System Management at the University of Maryland at College Park. He is conducting research with professor Bilal M. Ayyub in the area of development of fatigue fracture reliability-based design of ship structures. He has authored or co-authored several papers and reports. He has taken part in research developed for the Brazilian Navy and Petrobras—Brazilian Petroleum Company in the area of structural analysis and design of marine structures. Bilal M. Ayyub:is a Professor of Civil Engineering and the Director of the Center for Technology and Systems Management at the University of Maryland (College Park). He is also a researcher and consultant in the areas of structural engineering inspection methods and practices reliability and risk analysis. He completed his B.S. degree in civil engineering in 1980 and completed both the M.S. (1981) and Ph.D. (1983) in civil engineering at the Georgia Institute of Technology. Dr. Ayyub has an extensive background in uncertainty modeling and analysis risk-based analysis and design simulation and marine structural reliability. He is engaged in research work involving structural reliability marine structures uncertainty modeling and analysis and mathematical modeling using the theories of probability statistics and fuzzy sets. He has completed several research projects that were funded by the NSF USCG USN USACE ASME and several engineering companies. Dr. Ayyub served the engineering community in various capacities through societies that include ASNE ASCE ASME SNAME IEEE-CS and NAFIPS. He is the author and coauthor of about 250 p

The design of steel structures against fatigue requires the consideration of fatigue damage accumulation in the form of fatigue crack growth analysis and prediction. Fatigue is an important criterion to evaluate the adequacy of ship structural details, and the methods for prediction of fatigue life taking into account the crack growth are becoming of great interest This paper provides a methodology for ship structure fatigue analysis based on probabilistic linear elastic fracture mechanics. Probabilistic analysis requires the use of reliability methods for assessing fatigue life by considering the crack propagation process and the uncertainties associated with it The limit state function that governs fatigue crack growth is developed based on Paris law by considering as random variables the coefficient of the curve that describes the rate of change of crack size due to loading cycles and its relationship to stress level and initial crack size and the stresses induced by external loading. As an improvement to the traditional fatigue fracture probabilistic approach, this paper presents a methodology for probabilistic analysis of ship structure fatigue failure considering the effects of the residual stresses induced by hull fabrication process over the crack growth rate.

关键词： Shipbuilding

来源：评论

学校读者我要写书评

暂无评论

Erratum to: Multiple sweeping using the Denavit–Hartenberg representation method

引用

Computer-Aided design 1999年第13期31卷 855-855页

作者： K. Abdel-Malek S. Othman Department of Mechanical Engineering and Center for Computer-Aided Design The University of Iowa Iowa City IA 52242 USA US National Advanced Driving Simulator and Simulation Center 2401 Oakdale Avenue The University of Iowa Iowa City IA 52242 USA

来源：评论

学校读者我要写书评

暂无评论

Propulsion system simulations: Making the right choice for the application

引用

NAVAL ENGINEERS JOURNAL 1997年第5期109卷 83-97页

作者： Neilson, JJ Tarbet, RM Jeff Neilson:received a bachelor's degree in mechanical engineering from Carleton University in 1986. Since graduating he has worked for Gas TOPS Ltd. and has been involved in a number of projects related to control system analysis design and simulation of mechanical systems for aircraft and marine propulsion systems. He has evaluated the dynamic performance of gas turbine and diesel powered propulsion systems for destroyers frigates corvettes minehunters submarines and landing ships. Jeff is currently the manager of simulation systems in the Controls and Instrumentation Division of GasTOPS Ltd. 1996 Modeling Simulation and Virtual Prototyping Conference 24–26 June 1996 Crystal City Arlington Virginia. Robin Tarbet:received his bachelor's degree in mechanical engineering from Carleton University in 1988 and received a master's degree in aeronautical engineering from the same institution in 1990. He joined GasTOPS Ltd. in 1990 where he has been involved in a number of projects primarily related to the simulation and analysis of distributed digital systems for ship machinery control. Robin is currently a senior project engineer in the Controls and Instrumentation Division of GasTOPS Ltd.

The effective use of simulation for the design and analysis of propulsion systems, and for operator training of these systems, requires a clear definition of the simulation's intended purpose and expected results. Issues such as model fidelity, computational performance and data requirements must be carefully balanced against the development effort and costs. The relative importance of each of these factors can only be determined once the purpose and expected outputs from the simulation are known. Experience with some recent marine propulsion simulation initiatives has highlighted the need for dear definitions of model requirements, especially with regard to simulation fidelity and the use of physics-based models. Marine propulsion system simulations can be used for a variety of purposes ranging from machinery performance analysis through maneuvering and seakeeping analysis to equipment health monitoring studies. This wide range of applications, with differing requirements, provides an excellent forum for examining the influence of fidelity on simulation computational performance, data requirements, and development cost. Examples from various marine propulsion machinery simulations are used to illustrate the discussion.

关键词： Ship propulsion

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：