Systematic abstractions of microprocessor RTL models to enhance simulation efficiency

2004 ◽  
Author(s):  
D. Bhaduri ◽  
M. Chandra ◽  
H. Patel ◽  
Shekhar Sharad ◽  
S. Suhaib
Keyword(s):  
Simulation Efficiency

scholarly journals Scale effect on runoff in alpine mountain catchments on China's Gongga Mountain

2010 ◽  
Vol 7 (2) ◽  
pp. 2157-2186 ◽  
Author(s):  
Y. Lin ◽  
G. X. Wang
Keyword(s):  
Vegetation Type ◽  
Meteorological Conditions ◽  
Hydrological Processes ◽  
Transfer Model ◽  
Scaling Method ◽  
Gongga Mountain ◽  
Mountain Watershed ◽  
Simulation Efficiency ◽  
Scaling Models ◽  
Different Seasons

Abstract. Finding an effective method to upscale or downscale hydrological processes is the central concern in hydrological research. The aim of this paper is to investigate a powerful, regulated relationship between runoff and catchment area, and establish the runoff scale transfer model for Gongga Mountain in China. We chose a series of catchments in which the contributing areas ranged from 0.41 km2 to 80.5 km2 to monitor the hydrological processes and meteorological conditions since 1990. To identify the nature and causes of variation in the runoff response to the size of catchments, a two-stage scaling method was proposed to describe the processes of runoff scaling. The results indicated that runoff had a different statistical relationship in different seasons and the related parameters were also different. The scaling models indicated a higher simulation efficiency and precision between the observed runoff and the calculated runoff, and they also provided a practical way for upscaling or downscaling in an alpine mountain watershed. For alpine mountain catchments, the results showed that the vegetation type and cover might be important factors for the runoff response to the scale effective.

Modeling Controlled Articulated Flexible Systems Using Assumed Modes: Part II — Numerical Investigation

2001 ◽  
Author(s):  
Theodore G. Mordfin ◽  
Sivakumar S. K. Tadikonda
Keyword(s):  
Multibody Dynamics ◽  
Dynamic Systems ◽  
Flexible Multibody Dynamics ◽  
Companion Paper ◽  
Parameter Variation ◽  
Flexible Bodies ◽  
Simulation Efficiency ◽  
Multibody Dynamic ◽  
Flexible Multibody ◽  
Assumed Mode

Abstract Guidelines are sought for generating component body models for use in controlled, articulated, flexible multibody dynamics system simulations. In support of this effort, exact truth models and linearized large-articulation models are developed in a companion paper. The purpose of the truth models is to aid in evaluating the use of various types of component body assumed modes in the large-articulation models. The assumed mode models are analytically evaluated from the perspectives of both structural dynamics and multibody dynamics. In this paper, component body assumed modes are tested in a linearized large-articulation model. The numerical behavior of the model and its performance in the presence of parameter variation is investigated and explained. The results show that high accuracy, high simulation efficiency, and numerical robustness cannot be simultaneously achieved. However, in many cases, satisfactory levels of all three are achievable. Guidelines are proposed for modeling the flexible bodies in controlled-articulation flexible multibody dynamic systems.

On Selecting Assumed Modes in a Controlled Articulated Flexible Multibody Dynamics System

2007 ◽  
Author(s):  
Theodore G. Mordfin ◽  
Sivakumar Tadikonda
Keyword(s):  
Exact Solutions ◽  
Numerical Solutions ◽  
Structural Characteristics ◽  
Flexible Multibody Dynamics ◽  
Control Laws ◽  
Simulation Efficiency ◽  
Multibody Dynamic ◽  
Non Linear ◽  
Flexible Multibody ◽  
Constituent Component

The modeling and simulation of controlled-articulation flexible multibody dynamic systems often involves the use of approximating functions, or assumed modes, to represent the structural characteristics of the constituent component bodies. However, clear and complete guidance on appropriate component body modeling techniques is lacking. As a result, researchers and applications engineers encounter severe and unexplained numerical problems when simulating such systems. Earlier studies demonstrated these problems, explained their causes, and developed modeling guidelines from the perspective of accuracy, robustness, and simulation efficiency. In this study, the guidelines are tested and confirmed for a controlled-articulation flexible multibody dynamic system. In support of this effort, exact closed-form and numerical solutions are developed for the small elastic motions of a planar, flexible, two-link system in which each link is represented by an Euler-Bernoulli bar in transverse vibration. The inboard link is pinned to the ground, and the outboard link is pinned to the outboard end of the first link in an arbitrary configuration. Articulation is controlled by proportional and proportional/derivative feedback control laws. The exact solutions are “truth models” for the linear characteristics of an analogous non-linear large articulation model in which link deformations are represented by assumed modes. Using a linearized version of the non-linear large-articulation model as an assumed modes testbed, the modeling guidelines are tested against the exact solutions. The numerical results conform with expectation, and the efficacy of the guidelines is successfully confirmed.

Exploratory Studies on the Control of High-Speed Flows With Magnetogasdynamics

2002 ◽  
Author(s):  
Datta V. Gaitonde
Keyword(s):  
Flow Control ◽  
High Speed ◽  
Three Dimensional ◽  
Experimental Investigations ◽  
Control Mechanisms ◽  
Ground Testing ◽  
Simulation Efficiency ◽  
The Status ◽  
Physical Phenomena ◽  
Insight Into

Magnetogasdynamics (MGD) has the potential to lift many of the constraints presently inhibiting sustained hypersonic flight and affordable access to space. Given the difficulty of ground-testing under the expected harsh conditions, numerical methods can provide insight into the physical phenomena, and thus complement experimental investigations in the development of future concepts. This paper describes the status of an effort to develop a high-fidelity, fully three-dimensional method to explore MGD flow control in complex configurations. The theoretical model includes several non-ideal effects and takes recourse to a blend of first principles and phenomenological approaches to enhance simulation efficiency. Boundary conditions are summarized and sample verification exercises are presented. Exploratory calculations on a reentry vehicle and flow-through scramjet flowpath with MGD-bypass demonstrate the versatility of the approach and yield insight into dominant flow control mechanisms.

Performance Analysis of the PISO-Based CFD Simulation

2014 ◽  
Vol 607 ◽  
pp. 872-876 ◽  
Author(s):  
Xiao Guang Ren
Keyword(s):  
Performance Optimization ◽  
Execution Time ◽  
Cfd Simulation ◽  
Fluid Flows ◽  
Total Execution Time ◽  
Simulation Performance ◽  
Simulation Efficiency ◽  
Matrix Operations ◽  
The Matrix ◽  
Computational Fluid Dynamics Cfd

Computational Fluid Dynamics (CFD) is widely applied for the simulation of fluid flows, and the performance of the simulation process is critical for the simulation efficiency. In this paper, we analyze the performance of CFD simulation application with profiling technology, which gets the portions of the main parts’ execution time. Through the experiment, we find that the PISO algorithm has a significant impact on the CFD simulation performance, which account for more than 90% of the total execution time. The matrix operations are also account for more than 60% of the total execution time, which provides opportunity for performance optimization.

scholarly journals Pavement Analysis and Design by Multiphysics Reconstructing Algorithm for the Virtual Asphalt Mixture Based on the Discrete-Element Method

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Danhua Wang ◽  
Xunhao Ding ◽  
Tao Ma ◽  
Weiguang Zhang ◽  
Deyu Zhang
Keyword(s):  
Asphalt Mixture ◽  
Two Dimensions ◽  
Shape Modeling ◽  
Particle Flow Code ◽  
Stochastic Algorithm ◽  
Analysis And Design ◽  
Coarse Aggregates ◽  
Simulation Efficiency ◽  
Actual Ratio ◽  
Compressive Tests

Based on the Particle Flow Code in Two dimensions (PFC2D), an algorithm for modeling the two-dimensional virtual asphalt mixture was proposed in this study. By combining the AIMS scanning technology (Aggregate Imaging Measurement System) with the designed stochastic algorithm, the virtual coarse aggregates could be generated rapidly and precisely. Different from the conventional methods, the contour shapes of the coarse aggregates were rebuilt only to balance the shape modeling precision and simulation efficiency. Then by distributing the coarse particles within container, virtual skeletons were formed firstly. An innovate algorithm was proposed afterwards to distinguish the external and internal area of the coarse aggregates and then model the mastic part by filling the irregular hollow shape with uniformly arranged balls. By deleting the mastic balls randomly, the voids were reconstructed consistent with the actual ratio. In the end, the virtual uniaxial compressive tests of AC-16 were simulated within PFC2D and the dynamic modulus at different load frequencies was predicted. The results indicated that the proposed algorithm could not only model the asphalt mixture precisely but also characterized its mechanical behavior as well.

Wavelength influence on CMOS SOS IC dose rate laser simulation efficiency

2013 ◽  
Author(s):  
Petr K. Skorobogatov ◽  
Alexander Y. Nikiforov ◽  
Andrey N. Egorov ◽  
Anastasiya V. Ulanova ◽  
Georgiy G. Davydov
Keyword(s):  
Dose Rate ◽  
Simulation Efficiency ◽  
Laser Simulation

scholarly journals Optimal Design and Simulation of a Microsuction Cup Integrated with a Valveless Piezoelectric Pump for Robotics

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Bingshan Hu ◽  
Hongliu Yu
Keyword(s):  
Network Model ◽  
Negative Pressure ◽  
Optimization Design ◽  
Design Method ◽  
Efficiency Coefficient ◽  
The Finite Element Method ◽  
Piezoelectric Pump ◽  
Electric Network ◽  
Simulation Efficiency ◽  
Suction Cup

The traditional suction mechanism with an air pump in robotics is difficult to miniaturize. Integrating a piezoelectric pump into a suction cup is an effective method to achieve miniaturization. In this paper, a novel suction cup with a piezoelectric micropump is designed. The micropump is valveless and the suction cup is designed with a laminated structure in order to facilitate miniaturizing and manufacturing. A systematic optimization design method of the suction cup is introduced which addresses the static and dynamic driving characteristics of the piezoelectric actuator and the rectifying efficiency of diffuser/nozzle’s optimization. The design is verified via simulation using an improved equivalent electric network model. Static lumped parameters in this model are calculated by the finite element method instead of the traditional analytic method, and the diffuser/nozzle’s flow resistance is computed by integrating and introducing rectifying efficiency coefficient. Simulation results indicate that the suction cup can generate a stable negative pressure, and the equivalent electric network model can improve the simulation efficiency and accuracy. The maximum steady-state negative pressure of the suction cup can also be effectively improved after optimization.

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