Exclusvie : DynaMat v1.0

DynaMat v1.0


Info:
The design of foundation for vibrating machines requires an accurate
prediction of the foundation response. The method of analysis is
complex because it involves the dimension and geometry of the machine
foundation, the embedment effect, the material and radiation damping of
soils, variation of soil properties with depth, and the interaction
effect between the foundation and soils.

DynaMat uses a three dimensional hybrid method to estimate the
equivalent dynamic stiffness and damping of machine foundations.
Multiple soil layers can be specified and considered by the program.

The hybrid method contains finite elements that are employed in the
near field in order to obtain a discrete solution. In the far field, a
semidiscrete solution is synthesized from modes also calculated by the
finite element method. The solutions are matched by applying the
stationarity condition of a functional.

The finite element method is particularly attractive when dealing with
problems involving complicated geometries and inhomogeneities. Thus it
is widely used in soil-structure interaction studies. Finite elements
are employed in the near field (neighborhood of the source of
excitation or region of interest). However, because of the
unboundedness of the soil region, the near field must be defined by
introducing an artificial boundary. It is then necessary to apply
conditions at this boundary in order to reproduce the effect of the far
field (the complementary unbounded region).Ssince the objective in
applying these conditions is to allow absortion or transmission of the
waves impinging on the artificial boundaries, the conditions are
referred to as absorbing or transmitting boundary conditions and the
boundaries are known as absorbing or transmitting boundaries.

Input parameters consist of the dynamic properties of the layered soil,
geometric configuration of the mat foundation, and definition of
frequencies of analysis. The user specify the foundation with either
circular or rectangular shape. The program will automatically generate
the three dimensional finite element mesh for the analysis.

LIST OF FEATURES
The program employed well-established analytical solutions for soil-structure interaction under dynamic loading conditions.
The program performs dynamic analysis in frequency domain which is the common practice for design of machine foundations.
Under the magnitude of the vibration force, the soil is assumed to behave in the linear-elastic range.
Unified soil parameters such as shear modulus, Poisson's ratio, mass density, and damping ratio, are employed for soil strata.
The user specify the foundation with either circular or rectangular
shape. The program will automatically generate the three dimensional
finite element mesh for the analysis.
The user can specify the embedment of the foundation.
The user can input any number of different soil layers as long as the computer has enough memory to perform the analysis.
The program accepts either S.I. units or English units.
The Graphics menu contains quick observations of results contained in the output file, i.e.:
* Horizontal Stifness,
* Vertical Stiffness,
* Rocking Stiffness,
* Finite Element Mesh,
The files of input data and output data are text based and may be
directly accessed from within the DynaMat program, employing the user's
preferred text editor or word processor.
A well-documented manual is provided with relevant theoretical
background. The manual includes a full description of all commands
contained in the program menu, and example problems that are supplied
for reference.

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