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ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition, GT 1998

作者： Chiang, Hsiao-Wei D. Chung, Meng-Hsuan Center for Aviation and Space Technology Industrial Technology Research Institute United States Division of Research and Promotion National Center for High-Performance Computing United States

ISBN: (纸本)9780791878668

A frequent cause of turbomachinery blade failure is excessive vibration due to flutter or forced response. One method for dealing with this problem is to increase blade structural damping using either tip or mid-span shroud designs. Unfortunately, most existing aeroelastic analyses deal with a blade alone model which can not be used for system mode analysis. Therefore, judgments based on past experience are used to determine the acceptability of a shrouded blade design. A new cyclic symmetry analysis has been developed to predict shrouded blade flutter. The method provides a system approach, over and above the standard blade alone approach, for predicting potential aeroelastic problems. Using the blade natural frequencies and mode shapes from a cyclic symmetry finite element model, the unsteady aerodynamic forces of the system mode are calculated. A cyclic symmetry flutter analysis is then performed. This analysis has been applied to a typical shrouded fan blade to investigate blade flutter. The predicted system mode flutter demonstrated that the blade alone analysis can be non-conservative. Copyright © 1998 by ASME All Rights Reserved.

关键词： Finite element method

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A Semicustom masterslice synthesisor

A Semicustom masterslice synthesisor

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1998 3rd International Conference on ASIC

作者： Chen Lan Tang Zhiming Center of High Performance Computer Institute of Computing Technology Chinese Academy of Science

A synthesisor used to generate Gate Array's, FPGA 's,or CPLD 's masterslice is *** includes the abstraction of the common system model of these semicustom IC's basewafer and the synthesising algorithm which is structure cells binary generating tree *** time complexity of the synthesising algorithm is O（logn）.where n is the number of the nodes of the structure cells binary generating tree.

关键词： Semi-custome masterslice Synthesisor Structure cells binary generating treee Structure graphic of placement

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Transporting Design Data on Netlist Level——A Practical Application Example

Transporting Design Data on Netlist Level——A Practical App...

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1998 3rd International Conference on ASIC

作者： Chen Lan Tang Zhiming Center of High Performance Computer Institute of Computing Technology Chinese Academy of Sciences

Tht transportability of IC design data is becoming more and more important today for design reusable. This means that tht EDA tools should be able to accept the third part design *** right now almost all EDA tools vendor applied that their EDA tools can accept the industry standard EDA design data format,there arc still a lot of work must to be done first when a set of design data which has been finished with ont EDA tools will be reused in a new EDA tools which is different from the original *** an example ICT-R1455,this paper introduced a sheme that use tht third part design data which has already be *** EDA tools we used are CADENCE for simulation and MAX+PLUS H for Altera FPGA developing. The ICT-R1455 teas realized on Altera FPGA EPF10kRC240-3 with 40%gates usage.

关键词： Transportability of design data EDIF(Electronic Data Interchange Format) netlist design level

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Multi-spectral shocklayer radiance from a hypersonic slender body 33rd

Multi-spectral shocklayer radiance from a hypersonic slender...

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33rd Thermophysics Conference, 1999

作者： Levin, Deborah A. Candler, Graham V. Limbaugh, Charles C. Department of Chemistry George Washington University WashingtonDC20052 United States Department of Aerospace Engineering and Mechanics Army High Performance Computing Research Center University of Minnesota MinneapolisMN55455 United States Sverdrup Technology Inc AEDC Division Arnold Air Force Base TN37388-9013 United States

This paper presents a methodology for the calculation of the IR shocklayer radiance from a slender hypersonic vehicle. An overlay technique that has been successfully employed for chemically reacting hypersonic compressed and expanding flows has been extended to accurately model the vibrational state distributions of NO, CO, water and CO2, which are potential shocklayer radiators in the midwave infra-red. The spectral predictions show that radiation from shock heated ambient CO2 will be an important contribution at most altitudes and speeds slower than 3.5 km/set. A detailed vibrational statespecific model of CO2 excitation has been incorporated with the flow modeling using an overlay technique. Comparisons of the spatial distributions of CO2 vibrational states with a corresponding Boltzmann distribution at the translational temperature show that there are substantial differences in the populations. These predictions are important for the design of an upcoming sounding rocket experiment. © 1999, American institute of Aeronautics and Astronautics, Inc.

关键词： Hypersonic vehicles

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A hierarchical approach for dependability analysis of a commercial cache-based RAID storage architecture

A hierarchical approach for dependability analysis of a comm...

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International Symposium on Fault-Tolerant computing (FTCS)

作者： M. Kaaniche L. Romano Z. Kalbarczyk R. Iyer R. Karcich LAAS CNRS Toulouse France Center for Reliable and High Performance Computing University of Illinois Urbana-Champaign Urbana IL USA Storage Technology Corporation Louisville CO USA

We present a hierarchical simulation approach for the dependability analysis and evaluation of a highly available commercial cache-based RAID storage system. The architecture is complex and includes several layers of overlapping error detection and recovery mechanisms. Three abstraction levels have been developed to model the cache architecture, cache operations, and error detection and recovery mechanism. The impact of faults and errors occurring in the cache and in the disks is analyzed at each level of the hierarchy. A simulation submodel is associated with each abstraction level. The models have been developed using DEPEND, a simulation-based environment for system-level dependability analysis, which provides facilities to inject faults into a functional behavior model, to simulate error detection and recovery mechanisms, and to evaluate quantitative measures. Several fault models are defined for each submodel to simulate cache component failures, disk failures, transmission errors, and data errors in the cache memory and in the disks. Some of the parameters characterizing fault injection in a given submodel correspond to probabilities evaluated from the simulation of the lower-level submodel. Based on the proposed methodology, we evaluate and analyze: the system behavior under a real workload and high error rate (focusing on error bursts); the coverage of the error detection mechanisms implemented in the system and the error latency distributions; and the accumulation of errors in the cache and in the disks.

关键词： Cache storage Error correction Analytical models Delay Fault detection Error analysis performance analysis Fault tolerance Computer architecture Computational modeling

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d-Wave Pairing Correlation in the Two-Dimensional t−J Model

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Physical Review Letters 1998年第6期81卷 1294-1294页

作者： C. T. Shih Y. C. Chen H. Q. Lin T. K. Lee National Center for High-Performance Computing Hsinchu Taiwan Department of Physics Tunghai University Taichung Taiwan Department of Physics Chinese University of Hong Kong Hong Kong China Institute of Physics Academia Sinica Nankang Taipei Taiwan National Center for Theoretical Sciences P.O. Box 2-131 Hsinchu Taiwan

The pair-pair correlation function of the two-dimensional t−J model is studied by using the power-Lanczos method under the assumption of monotonic behavior. In comparison with the results of the ideal Fermi gas, we conclude that the 2D t−J model does not have long-range d-wave superconducting correlation in the interesting parameter range of J/t≤0.5. Implications of this result are also discussed.

关键词： .HTSC wave pairing pairing correlation pair-pair correlation

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An iterative Riemann solver for relativistic hydrodynamics

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SIAM JOURNAL ON SCIENTIFIC computing 1997年第4期18卷 982-995页

作者： Dai, WL Woodward, PR University of Minnesota MN 55455 Army High Performance Computing Research Center Supercomputer Institute School of Physics and Astronomy University of Minnesota MN 55455

An approximate method for solving the Riemann problem is needed to construct Godunov schemes for relativistic hydrodynamical equations. Such an approximate Riemann solver is presented in this paper which treats all waves emanating from an initial discontinuity as themselves discontinuous. Therefore, jump conditions for shocks are approximately used for rarefaction waves. The solver is easy to implement in a Godunov scheme and converges rapidly for relativistic hydrodynamics. The fast convergence of the solver indicates the potential of a higher performance of a Godunov scheme in which the solver is used.

关键词： shock Riemann problem relativistic flows Godunov scheme

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An Interaction of Coherence Protocols and Memory Consistency Models in DSM Systems

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Operating Systems Review (ACM) 1997年第4期31卷 41-54页

作者： Shi, Weisong Hu, Weiwu Tang, Zhimin Center of High Performance Computing Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China

Coherence protocols and memory consistency models are two improtant issues in hardware coherent shared memory multiprocessors and softare distributed shared memory(DSM) systems. Over the years, many researchers have made extensive study on these two issues repectively. However, the interaction between them has not been studied in the literature. In this paper, we study the coherence protocols and memory consistency models used by hardware and software DSM systems in detail. Based on our analysis, we draw a general definition for memory consistency model, i.e., memory consistency model is the logical sum of the ordering of events in each processor and coherence protocol. We also point that in hardware DSM system the emphasis of memory consistency model is relaxing the restriction of event ordering, while in software DSM system, memory consistency model focuses mainly on relaxing coherence protocol. Taking Lazy Release Consistency(LRC) as an example, we analyze the relationship between coherence protocols and memory consistency models in software DSM systems, and find that whether the advantages of LRC can be exploited or not depends greatly on it's corresponding protocol. We draw the conclusion that the more relaxed consistency model is, the more relaxed coherence protocol needed to support it. This conclusion is very useful when we design a new consistency model. Furthermore, we make some improvements on traditional multiple writer protocol, and as far as we aware, we describe the complex state transition for multiple writer protocol for the first time. In the end, we list the main research directions for memory consistency models in hardware and software DSM systems.

关键词： Coherence Protocol Event Ordering Hardware DSM Systems Memory Consistency Models Software DSM Systems

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Computation of double-cone experiments in high enthalpy nitrogen 32nd

Computation of double-cone experiments in high enthalpy nitr...

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32nd Thermophysics Conference, 1997

作者： Olejniczak, Joseph Candler, Graham V. Hornung, Hans G. Department of Aerospace Engineering and Mechanics Army High Performance Computing Research Center University of Minnesota MinneapolisMN55455 United States Graduate Aeronautical Laboratories California Institute of Technology PasadenaCA91125 United States

A series of experiments studying hypervelocity nitrogen flow over double-cone geometries has been conducted in the T5 Shock tunnel at the California institute of technology. Holographic interferometry was used to visualize the flow. These experiments were designed to test thermochemical models used in hypersonic flow computations, and the geometries were chosen specifically to produce flow fields sensitive to the effects of finite rate chemistry. Comparisons between the experimental and computational interferograms show that the computations cannot reproduce the experimental results. The reasons for the differences between the computations and experiments are the uncertainties in both equilibrium and nonequilibrium dissociation rates for nitrogen. The double-cone flow fields with a large separation zone are much more sensitive to the chemical rates than blunt body flow fields. Until the equilibrium dissociation rates for nitrogen are known more accurately, it is impossible to asses the validity of current vibration-dissociation coupling models. © 1997 by Joseph Olejniczak. Published by the American institute of Aeronautics and Astronautics, Inc.

关键词： Flow fields

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A data-parallel line relaxation method for the Navier-Stokes equations 13th

A data-parallel line relaxation method for the Navier-Stokes...

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13th Computational Fluid Dynamics Conference, 1997

作者： Wright, Michael J. Candler, Graham V. Bose, Deepak Department of Aerospace Engineering and Mechanics Army High Performance Computing Research Center University of Minnesota MinneapolisMN55455 United States Thermosciences Institute NASA Ames Research Center Moffet FieldCA94035 United States

The Gauss-Seidel Line Relaxation (GSLR) method of MacCormack is modified for the simulation of viscous flows on massively parallel computers. The resulting Data-Parallel Line Relaxation (DPLR) method is shown to have good convergence properties for a series of test cases. The new method requires significantly more memory than the previously developed data-parallel relaxation, methods, but it reaches a steady-state solution in much less time for all cases tested to date. In addition, the DPLR method shows good convergence properties even on the high cell aspect ratio grids required to simulate high Reynolds number flows. The new method is implemented using message-passing on the Cray T3E, and the parallel performance of the method on this machine is discussed. The DPLR method combines the fast convergence of the GSLR method with a high parallel efficiency, and thus shows promise for large-scale simulation of viscous flows. © 1997, American institute of Aeronautics and Astronautics, Inc.

关键词： Viscous flow

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