Study of structural analysis by large scale parallel multibody dynamic simulation

Environmental legislations in the Western world impose stringent effluent quality standards for ultimate protection of the environment. This is also observed in Turkey. The current paper presents efforts made to simulate an existing 0.77 million m3/day conventional activated sludge plant located at Ankara, AWTP. The ASM1 model was used for simulation in this study. The model contains numerous stoichiometric and kinetic parameters, some of which need to be determined on case by case bases. The easily degradable COD (SS) was determined by two methods, physical-chemical and respirometric methods, namely. The latter method was deemed unreliable and rejected in the further study. Dynamic simulation with SSSP program predicted effluent COD and MLSS values successfully while overestimating OUR. A complete fit could only be obtained by introducing a dimensionless correction factor (ηO2 = 0.58) to the oxygen term in ASM1.

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Menger-decomposition of a graph and its application to the structural analysis of a large-scale system of equations

Discrete Applied Mathematics ◽

10.1016/0166-218x(87)90008-4 ◽

1987 ◽

Vol 17 (1-2) ◽

pp. 107-134 ◽

Cited By ~ 2

Author(s):

Kazuo Murota

Keyword(s):

Structural Analysis ◽

Large Scale ◽

System Of Equations ◽

Large Scale System

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Independent and complementary methods for large-scale structural analysis of mammalian chromatin

Genome Research ◽

10.1101/gr.5636607 ◽

2007 ◽

Vol 17 (6) ◽

pp. 928-939 ◽

Cited By ~ 27

Author(s):

J. H. Dennis ◽

H.-Y. Fan ◽

S. M. Reynolds ◽

G. Yuan ◽

J. C. Meldrim ◽

...

Keyword(s):

Structural Analysis ◽

Large Scale ◽

Complementary Methods

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A new hybrid solver with two-level parallel computing for large-scale structural analysis

Concurrency and Computation Practice and Experience ◽

10.1002/cpe.3361 ◽

2014 ◽

Vol 27 (14) ◽

pp. 3661-3675 ◽

Cited By ~ 3

Author(s):

Xinqiang Miao ◽

Xianlong Jin ◽

Junhong Ding

Keyword(s):

Parallel Computing ◽

Structural Analysis ◽

Large Scale ◽

Hybrid Solver

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Random Loads Fatigue: The Use of Spectral Methods Within Multibody Simulation

Volume 1: 20th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C ◽

10.1115/detc2005-84453 ◽

2005 ◽

Cited By ~ 7

Author(s):

Claudio Braccesi ◽

Filippo Cianetti ◽

Luca Landi

Keyword(s):

Finite Element ◽

Stress State ◽

Dynamic Simulation ◽

Fatigue Damage ◽

Spectral Methods ◽

Mechanical Systems ◽

Frequency Domain Method ◽

Stress And Strain ◽

Damage Evaluation ◽

Multibody Dynamic

The evaluation of the fatigue damage performed by using the Power Spectral Density function (PSD) of stress and strain state is proving to be extremely accurate for a family of random processes characterized by the property of being stationary. The present work’s original contribution is the definition of a methodology which extracts stress and strain PSD matrices from components modelled using a modal approach (starting from a finite element modelling and analysis) within mechanical systems modelled using multibody dynamic simulation and subject to a generic random load (i.e. multiple-input, with partially correlated inputs). This capability extends the actual stress evaluation scenario (principally characterised by the use of finite element analysis approach) to the multibody dynamic simulation environment, more powerful and useful to simulate complex mechanical systems (i.e. railway, automotive, aircraft and aerospace systems). As regards the fatigue damage evaluation, a synthesis approach to evaluate an equivalent stress state expressed in terms of the PSD function of Preumont’s “equivalent von Mises stress (EVMS)”, starting from the complete stress state representation expressed in terms of PSD stress matrix and easily usable in the consolidated spectral methods, is proposed. This approach allows and has allowed the use of the above methods such as the Dirlik formula as a damage evaluation method. An additional result is the conception and implementation of a frequency domain method for the component’s most probable state of stress, allowing quickly identification of the most stressed and damageble locations. The described methodologies were developed and embedded into commercial simulation codes and verified by using as a test case a simple reference multibody model with a simple flexible component.

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