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Application Of Fk Analysis Of Surface Waves For Geotechnical Characterization, Sebastiano Foti, Renato Lancellotta, Laura V. Socco, Luigi Sambuelli Mar 2001

Application Of Fk Analysis Of Surface Waves For Geotechnical Characterization, Sebastiano Foti, Renato Lancellotta, Laura V. Socco, Luigi Sambuelli

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Since the introduction of the SASW method the use of surface waves for soil characterization has gained great popularity in geotechnical engineering. The typical two-receiver testing configuration shows some inherent drawbacks, for this reason a multistation approach is proposed in this paper. The dispersion curve evaluation with a multistation scheme has several advantages. First of all, the estimate is much more stable and less sensitive to noise and internal phases of the instruments. Moreover signal interpretation is much clearer with respect to SASW approach and there is no need for subjective choices in the construction of the experimental dispersion curve. …

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Dynamic Youngis Modulus And Axial Strain Relationships, X. J. Zhang, M. S. Aggour Mar 2001

Dynamic Youngis Modulus And Axial Strain Relationships, X. J. Zhang, M. S. Aggour

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Equations of Young’s moduli of sands as a function of the axial strain amplitude for different types of dynamic loading were developed from a series of resonant column tests. Ottawa 20-30 sand specimens were excited longitudinally with one of three types of loading at three different confining pressures. In the sinusoidal tests, excitation signals were generated by a variable frequency sine-wave oscillator. In the random tests, input signals were generated by a white-noise generator and a pulse signal generator was used in the impulse tests. Input and output signals were analyzed by an FFT analyzer in the random and impulse …

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The Influence Of Lateral Faults In The Nonlinear Analysis In An Alluvionar Valley, Marcel Vasile Sincraian, Carlos Sousa Oliveira, J. V. Lemos Mar 2001

The Influence Of Lateral Faults In The Nonlinear Analysis In An Alluvionar Valley, Marcel Vasile Sincraian, Carlos Sousa Oliveira, J. V. Lemos

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The nonlinear dynamic behavior of an alluvionar valley situated in São Sebastão region in Terceira island (Azores archipel) is performed. The Mohr-Coulomb model is used in this paper. A bidimensional cross-section with 1240 m long and 250 m depth is considered. The cross-section of the model is composed by layers having different type of ground, each one having their own geotechnical characteristics. The Distinct Element method is employed in this case. UDE Code is used. The size of Finite Elements has been tailored to the wavelength of the propagating waves through the layers. The objectives of this paper are: 1) …

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Determination Of The Zone Of Destruction Of Soil And Rock Mass At Explosive Loads, B. E. Khusanov Mar 2001

Determination Of The Zone Of Destruction Of Soil And Rock Mass At Explosive Loads, B. E. Khusanov

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper studies the behavior of grounds and rock mass under explosive loads using a new worked out model of deformation of ground and rock mass accounting structural destruction of grounds. Here mechanical characteristics of grounds are the functions on the degree of structural destruction (on the second invariant of the deviator of deformation). The problem on excitation propagation from hemispherical cavity cut from ground half-space, to the sides of this cavity a load is applied, imitating the action of explosion. The problem is solved numerically - by the method of finite differences according to the scheme offered by Wilkins …

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Natural Frequency Of Vibrating Foundations On Layered Soil System-An Experimental Investigation, D. K. Baidya, G. Muralikrishna Mar 2001

Natural Frequency Of Vibrating Foundations On Layered Soil System-An Experimental Investigation, D. K. Baidya, G. Muralikrishna

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper presents model block vibration tests results on two and three layered soil system underlain by rigid layer. Using sand and sawdust in different positions (either at top or at middle or at bottom) and thickness (es) inside a tank, different layered soil bed are prepared and vibration tests are conducted on each prepared bed using Lazan Type oscillator. A large number of response curves (frequency vs. amplitude) are obtained on different layered system. Maximum amplitudes (resonant amplitude) and corresponding frequencies (resonant frequency) are tabulated to study the effect of layering on resonant frequencies. Effects of position and thickness …

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Dynamic Interaction Between Rail Track Systems And The Layered Subsoil Solutions In The Frequency-And Time Domain, S. Savidis, S. Bergmann, C. Bode, R. Hirschauer Mar 2001

Dynamic Interaction Between Rail Track Systems And The Layered Subsoil Solutions In The Frequency-And Time Domain, S. Savidis, S. Bergmann, C. Bode, R. Hirschauer

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

For the numerical simulation of dynamic soil-structure interaction problems both a frequency and a time domain formulation are presented. In order to be capable to consider more sophisticated models of the structure, the frequency domain algorithms for homogeneous and layered halfspaces have been coupled to the Finite Element Program ANSYS. Flexibility functions are presented for a concrete slab track system. Furthermore the stress distribution in the subsoil is calculated and visualized. The time domain formulation is applied for demonstrating the basic phenomena of a moving load passing by with sub- and supercritical speed. Besides that, a nonlinear, tension-free condition of …

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Vibration Of Synchrotron Foundation Due To Ground-Transmitted Excitation, M. Hesham El Naggar, Bruce F. Sparling Mar 2001

Vibration Of Synchrotron Foundation Due To Ground-Transmitted Excitation, M. Hesham El Naggar, Bruce F. Sparling

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The Canadian Light Source (CLS) is a third generation synchrotron that will be capable of generating a wide spectrum of electromagnetic radiation used in the study of the atomic and sub-atomic structure of materials. The CLS facility will feature a 50 m diameter vacuum storage ring used to contain a highly focused stream of electrons. The accuracy required in aiming the electron beam and resulting radiation necessitates very stringent operational tolerances on foundation vibrations, with peak dynamic displacements being limited to less than 0.35 μm. To assess the level of seismic excitation at the site due to traffic on an …

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Reflection And Refraction Of Quasi-P Wave Due To A Sandwich Isotropic Layer Between Two Monoclinic Half-Spaces, S. Saha, A. Chattopadhyay, D. Banerjee Mar 2001

Reflection And Refraction Of Quasi-P Wave Due To A Sandwich Isotropic Layer Between Two Monoclinic Half-Spaces, S. Saha, A. Chattopadhyay, D. Banerjee

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The reflection and refraction of quasi-P(qP) wave below a transition isotropic layer sandwiched between two monoclinic media have studied. Due to incident of qP-wave at the interface of monoclinic lower half space and isotropic transition layer of thickness H, it will give rise to reflected qP, qSV, qSH-wave in the lower monoclinic half space and reflected P-wave and SV-wave at the isotropic transition layer of thickness H. As there is mother interface between transition layer and monoclinic upper-half space extended up to infinity, these two refracted P and SV-wave will incident at the interface with angle and 64 respectively. These …

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An Experimental Investigation On Trench Isolation Techniques For Vibration Control, E. Saibaba Reddy, K. Rama Sastri, M. Abishekar Paul Mar 2001

An Experimental Investigation On Trench Isolation Techniques For Vibration Control, E. Saibaba Reddy, K. Rama Sastri, M. Abishekar Paul

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

One of the methods of controlling vibration amplitudes at source is by adopting active isolation techniques. Trench barriers are identified as methods of isolation. This paper deals with series experimental investigation carried out on block vibration tests with active isolation trench barriers. The parameters like depth of embedment, dimensions of trench, fill material in trench etc., are studied by carrying out the block vibration test in field. The results are analysed to identify the influence of those parameters.

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Computational Simulation Procedure For Soil-Structure Interaction Modeling In Building Seismic Damage Response, Ismail M. Ismail, Chris Mullen Mar 2001

Computational Simulation Procedure For Soil-Structure Interaction Modeling In Building Seismic Damage Response, Ismail M. Ismail, Chris Mullen

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A finite element based computational procedure is presented for soil-structure interaction modeling in building seismic response. Attention is focused on a combination of contact surfaces at the soil-foundation interface, nonlinear soil material and infinite elements as transmitting boundary conditions. A rationale for efficient mesh design is offered for the building/foundation/soil system model based on computational wave propagation studies using infinite elements. As a the proposed procedure, a comparison is made between results of eigen mode analysis of two models for a 3-story office building, with the conventional treatment of the foundation and soil as discrete linear springs [3], and …

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Dynamic Soil-Pile-Structure Interaction, Yingcai Han Mar 2001

Dynamic Soil-Pile-Structure Interaction, Yingcai Han

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The largest compressor train in North America was installed for a new ethylene production plant at the Nova Chemicals Facility located near Joffre, Alberta. To illustrate the effect of soil-pile-structure interaction, the dynamic behavior of the structure using flexible piled foundation is compared to the same structure fixed to a rigid base in this paper. Both field and laboratory tests were carried out to investigate the soil properties including down hole seismic tests to provide soil shear wave velocities at different depths. Different design options are considered and an optimum design selected to limit vibration and produce a safe, economic …

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Foundation-Soil-Inclusion Interaction Modelling For Rion-Antirion Bridge Seismic Analysis, Dan Yang, Ricardo Dobry, Ralph B. Peck Mar 2001

Foundation-Soil-Inclusion Interaction Modelling For Rion-Antirion Bridge Seismic Analysis, Dan Yang, Ricardo Dobry, Ralph B. Peck

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The Rion-Antirion Bridge in Greece will span a total length of 352 1 m, which includes a five span cable-stayed bridge 2252m in length and two approach viaducts. Upon completion in 2004, the bridge will be the longest cable-stayed bridge in the world. The main factors affecting the foundation design involve high seismicity, poor in-situ soil conditions, deep sea water (65m) and high ship impact force. These factors called for an innovative foundation design for each of the 90m diameter piers by the foundation designer, Geodynamique et Structure (GDS) from France. The proposed design consists of vertical open-ended steel cylinders …

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Prediction Of Lateral Dynamic Response Of Single Piles Embedded In Fine Soils, Shamsher Prakash, Houda Jadi Mar 2001

Prediction Of Lateral Dynamic Response Of Single Piles Embedded In Fine Soils, Shamsher Prakash, Houda Jadi

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The lateral dynamic response of a single pile predicted by analytical models often yields higher natural frequencies and lower resonant amplitudes than those determined in field tests. This has been related to overestimated soil’s shear modulus and radiation damping used in the calculations of the response. The objective of this study was to determine a simple method to improve the theoretical predictions, primarily those of piles embedded in clay or fine silty sands. Accordingly, reduction factors to the soil’s shear modulus and radiation damping were proposed. These factors were related to the shear strain at predicted peak amplitudes.

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Soil-Pile Interaction Analysis Using Fe-Be Coupling In Frequency Domain, Moon Kyum Kim, Yun Mook Lim, Min Kyu Kim, Seok Ho Cho Mar 2001

Soil-Pile Interaction Analysis Using Fe-Be Coupling In Frequency Domain, Moon Kyum Kim, Yun Mook Lim, Min Kyu Kim, Seok Ho Cho

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In this study, a numerical method for soil-pile interaction problems in multi-layered half-plane is developed in frequency domain using FE-BE coupling technique. The soil-pile interaction system is divided into two parts, so-called near field and far field. In the near field, beam elements are used for modeling pile and plane-strain finite elements for surrounding soil media. Also, a superstructure is considered as a lumped mass on a pile. In the far field, layered soil media is modeled by boundary element formulation using the dynamic fundamental solution. Then, these two fields are assembled using FE-BE coupling technique. This coupled numerical method …

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Seismic Active And Passive Earth Pressures On Rigid Retaining Structures By A Kinematical Approach, Abdul-Hamid Soubra, Borut Macuh Mar 2001

Seismic Active And Passive Earth Pressures On Rigid Retaining Structures By A Kinematical Approach, Abdul-Hamid Soubra, Borut Macuh

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The seismic active and passive earth pressure problems are investigated by means of the kinematical method of the limit analysis theory. Two rotational kinematically admissible failure mechanisms M1 and M2 are proposed. Quasi-static representation of earthquake effects using the seismic coefficient concept is adopted. The solutions obtained are rigorous upper-bound ones in the framework of the limit analysis theory. The numerical results of the seismic active and passive earth pressure coefficients are presented and compared with other authors’ results. These results improve the best available upper-bound solutions given by Chen and Liu (1990) in the active case and Soubra (2000) …

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Seismic Analysis And Retrofit Of Dock Walls, Andrew J. Mair, David Muir Wood Mar 2001

Seismic Analysis And Retrofit Of Dock Walls, Andrew J. Mair, David Muir Wood

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Numerical analyses have been performed in order to assess the performance of old dock walls under earthquake loading and, if necessary, to develop appropriate remedial measures and check the seismic performance of these. This paper describes the procedures that have been adopted in order to use the numerical analysis program FLAC for time domain analyses. Boundary conditions have been chosen in order to permit synthetic time histories of base motion to be applied to the models. Fills have been modelled as elastic-Mohr-Coulomb frictional materials; concrete and masonry have been modelled as elastic materials, but the inclusion of interfaces representing construction …

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Seismic Response Calculation Of Saturated Soft Soil, Huang Yu, Ye Weimin, Tang Yiqun, Chen Zhuchang Mar 2001

Seismic Response Calculation Of Saturated Soft Soil, Huang Yu, Ye Weimin, Tang Yiqun, Chen Zhuchang

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In this paper, Shanghai saturated soft soil is modeled as a two-phase porous media system consisting of solid and fluid phases. On the basis of resonant column test and dynamic triaxial test data of Shanghai saturated soft soil, the dynamic calculation model including a set of relationships of stress, strain, and pore water pressure and earthquake subsidence is developed to compute the seismic response of soil. The procedure to identify soil constants for the dynamic calculation model is also reported in detail. Subsequently, a dynamic effective stress analysis with the finite element method has been recommended to predict the seismic …

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Dynamic Response Of Seabed Under Wave-Induced Loading, Maotian Luan, Dong Wang Mar 2001

Dynamic Response Of Seabed Under Wave-Induced Loading, Maotian Luan, Dong Wang

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In this paper, the characteristics of the development of effective stresses and pore water pressure in elastic or elasto-plastic seabed with time under a sequence of wave loading are studied by virtue of numerical finite element analyses. Compared with analytical solution for elastic problem, the numerical procedure proposed can deal with complicated situation of seabed and can predict residual pore pressure. For inelastic seabed, bounding-surface hypoplasticity model is employed to describe the nonlinear stress-strain relationship of sand under cyclic loading. The development pattern of pore pressure under undrained condition obtained from laboratory experiments is not necessary in the numerical simulation.

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Lateral Impedance Of Single Piles In Inhomogeneous Soil, George Mylonakis, Demetri Roumbas Mar 2001

Lateral Impedance Of Single Piles In Inhomogeneous Soil, George Mylonakis, Demetri Roumbas

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The flexural stiffness and damping (dynamic impedance) of a single vertical pile in an inhomogeneous soil deposit with continuously increasing stiffness with depth, is studied. An analytical formulation based on the Beam-on-Dynamic-Winkler-Foundation (BDWF) model is implemented. The model is used in conjunction with a virtual work approximation and pertinent shape functions for the deflected shape of a long flexible pile, which are analogous to those used in finite-element formulations. Explicit closed-form solutions are derived for: (1) the dynamic pile stiffness; and (2) the damping coefficient at the pile head. Both swaying and rocking vibrations are considered and all associated impedance …

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Simplified Methods For The Dynamic Analysis Of Single Pile In Layered Soils, Roberto Cairo, Enrico Conte, Giovanni Dente Mar 2001

Simplified Methods For The Dynamic Analysis Of Single Pile In Layered Soils, Roberto Cairo, Enrico Conte, Giovanni Dente

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In this paper, two simplified methods are used to calculate the impedance function of an axially loaded pile embedded in layered soils. The methods are: a semi-analytical procedure which uses the discrete layer stiffness matrices derived by Kausel and Roesset (1981), and the cone model which was developed by Wolf et al. (1992). A number of comparisons with more rigorous solutions are shown in order to assess the accuracy of the methods used.

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Soil Column Response And Liquefaction Analyses, Sanjeev Kumar Mar 2001

Soil Column Response And Liquefaction Analyses, Sanjeev Kumar

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper presents the procedure and results of soil column response (ground response) and liquefaction analyses performed for a site located in St. Charles, Missouri. Synthetic earthquake time histories were developed since recorded strong ground motion data for Central United States are not available. For ground response analysis, synthetic earthquake time histories and ground motions from two earthquakes in Canada were used. Synthetic time histories were generated using attenuation relationships for Central and Eastern United States. Liquefaction analysis was performed using the widely used simplified procedure which involves comparison of Cyclic Stress Ratio (CSR) and Cyclic Resistance Ratio (CRR).

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Relevant Aspects Of Applying Soil Improvement Method For Liquefaction Mitigation — Case Study, Valtko Sesov, Kosta Talaganov Mar 2001

Relevant Aspects Of Applying Soil Improvement Method For Liquefaction Mitigation — Case Study, Valtko Sesov, Kosta Talaganov

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper presents some experience gathered during the implementation of soil improvement in founding of a residential-business complex located in seismically prone area. The previously performed field and laboratory geomechanical tests proved that the geotechnical medium of the location was characterized by a high heterogeneity of soil materials with predominant presence of layers of low strength-deformability characteristics. A high underground water level and layers of fine-grained uniform sands susceptible to dynamic instability under seismic effects were observed. Such an unfavorable geotechnical situation of the given location imposed the need of improving of the natural foundation soil. The most favorable and …

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Shear Wave Velocity Relations For Silty And Gravely Soils, S. Thevanayagam, J. Liang Mar 2001

Shear Wave Velocity Relations For Silty And Gravely Soils, S. Thevanayagam, J. Liang

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Shear wave velocity vs, dynamic shear modulus Gmax, and damping characteristics are important parameters required for both static and dynamic response analyses of earth structures. Traditional indirect methods for estimation of these parameters based on void ratio, relative density, and mean effective stress have been successful for rather narrowly graded soils, but not for the most commonly found silty and gravelly soils. Their direct application to determine the above characteristics for silty and gravely soils are not satisfactory. A primary reason for this is that global void ratio is not a good measure of intergrain contact …

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Infrared Thermography Of Dissipation In Soil, Minh-Phong Luong Mar 2001

Infrared Thermography Of Dissipation In Soil, Minh-Phong Luong

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The paper introduces infrared thermography as a noncontact and non-destructive technique that conveniently offers the possibility of evaluating the energy-dissipating ability of soil, traditionally difficult to be determined using traditional techniques. It allows records and observations in real time of heat patterns produced by the dissipation of energy caused by friction between grains. Such dissipative heat occurs when soil is subjected to vibratory loading exceeding the characteristic threshold, and it evidences the distortion mechanism. This energy dissipation mechanism influences the wave speed, intergranular attenuation, and dispersion through particles contacts. The infrared thermographic technique, which couples mechanical and thermal energy, offers …

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Effect Of Plasticity Of Soil On Seismic Response Of Pile Foundation: Parametric Study, B. K. Maheshwari, K. Z. Truman, P. L. Gould Mar 2001

Effect Of Plasticity Of Soil On Seismic Response Of Pile Foundation: Parametric Study, B. K. Maheshwari, K. Z. Truman, P. L. Gould

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Much of the reported research on the dynamic analysis of pile foundations assumes linear behavior of soil that may not be valid at strong excitations. In this paper material nonlinearity of soil caused by plasticity and work hardening is considered for the dynamic analysis of pile foundations. An advanced plasticity based soil model, HISS, is incorporated in a finite element technique. Analysis is carried out in the time domain. The algorithm is verified with available analytical results and then linear and nonlinear responses of a single end bearing pile are compared. Effects of different frequencies of excitation (harmonic) and ratio …

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Local Site Effects Of Transient Dynamic Characteristics Of Irregularly Layered Grounds, Takashi Akiyoshi, Kunihiko Fuchida, Shozo Shirinashihama Mar 2001

Local Site Effects Of Transient Dynamic Characteristics Of Irregularly Layered Grounds, Takashi Akiyoshi, Kunihiko Fuchida, Shozo Shirinashihama

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

To explain the heavily damaged area for Kobe earthquake in 1995, nonlinear response characteristics of 2D irregularly reclaimed soil layers of saturated and unsaturated soil are investigated by using the existing FE program for effective stress analysis. For numerical computations, a typical Kobe ground model and a reference ground model with the absorbing boundary conditions are used. In order to understand the local transient characteristics of grounds due to liquefaction, the time-dependent fundamental natural period are investigated as a key parameter. Main conclusions are that liquefaction changes the dynamic characteristics of the sites into the transient high-cut filters and also …

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Seismic Response Of Deep Stiff Granular Soil Deposits, Lynn A. Salvati, Thomas M.-H. Lok, Juan M. Pestana Mar 2001

Seismic Response Of Deep Stiff Granular Soil Deposits, Lynn A. Salvati, Thomas M.-H. Lok, Juan M. Pestana

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Seismic site response analysis is of paramount importance for many problems in earthquake engineering and has been studied extensively over the last 50 years. More recently, the observed response of deep stiff soil profiles during seismic events has indicated the possibility of significant ground amplification. In this study, a new enhanced hysteretic constitutive model is used for the evaluation of dynamic site response of deep granular soil deposits. The constitutive laws are implemented in a finite element computer code, AMPLE2000. The response of two soil profiles to different earthquake records was calculated using the newly developed model implemented in AMPLE …

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Hybrid Evolutionary Computing Model For Mobile Agents Of Wireless Internet Multimedia, William S. Hortos Mar 2001

Hybrid Evolutionary Computing Model For Mobile Agents Of Wireless Internet Multimedia, William S. Hortos

Electrical Engineering and Computer Science Faculty Publications

The ecosystem is used as an evolutionary paradigm of natural laws for the distributed information retrieval via mobile agents to allow the computational load to be added to server nodes of wireless networks, while reducing the traffic on communication links. Based on the Food Web model, a set of computational rules of natural balance form the outer stage to control the evolution of mobile agents providing multimedia services with a wireless Internet protocol (WIP). The evolutionary model shows how mobile agents should behave with the WIP, in particular, how mobile agents can cooperate, compete and learn from each other, based …

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Statistical Characterization Of Macroscale Multiphase Flow Textures In Trickle Beds, Y. Jiang, M. (Muthanna) H. Al-Dahhan, M. P. Duduković Mar 2001

Statistical Characterization Of Macroscale Multiphase Flow Textures In Trickle Beds, Y. Jiang, M. (Muthanna) H. Al-Dahhan, M. P. Duduković

Chemical and Biochemical Engineering Faculty Research & Creative Works

Experimental Studies (Lutran Et Al., Ind. Engng Chem. Res. 30 (1991) 1270; Ravindra Et Al., Ind. Engng Chem. Res. 36 (1997) 5133) and Numerical Simulation (Jiang Et Al., Chem. Engng Sci. 54 (1999) 2409-2419) Lead to the Conclusion that Fluid Flow Distribution in Trickle Beds is a Function of Bed Structure (I.e. Porosity Distribution), Particle External Wetting and Inlet Superficial Velocities of the Two Fluids. in This Study, Quantitative Relationships among the above Parameters Are Developed in a Statistical Manner through a Series of Computational Fluid Dynamics Simulations. the Contribution of Capillary Forces to Liquid Maldistribution is Significant in the …

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Interval Computations As A Particular Case Of A General Scheme Involving Classes Of Probability Distributions, Scott Ferson, Lev Ginzburg, Vladik Kreinovich, Harry Schulte Mar 2001

Interval Computations As A Particular Case Of A General Scheme Involving Classes Of Probability Distributions, Scott Ferson, Lev Ginzburg, Vladik Kreinovich, Harry Schulte

Departmental Technical Reports (CS)

Traditionally, in science and engineering, measurement uncertainty is characterized by a probability distribution; however, we don't know this probability distribution exactly, so we must consider classes of probability distributions. Interval computations deal with a very specific type of such classes: classes of all distributions which are located on a given interval. We show that in general, we need all convex classes of probability distributions.

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