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pressure. For example, you may solve the vibration frequency by Nastran software
and get a result file as .op2 form, and read this file into Sysnoise software the sound
pressure should be solved through you define some conditions and solve it.
Another example is to solve the aeroacoustics by this method. You should solve the
air flow or water flow near a car, an aircraft or a submarine by Fluent software and
read these results into Sysnoise to solve the sound pressure. This is a most useful
method to solve the sound which caused by fluid flow.
Difference from NVH analysis that fatigue analysis and topology optimization
should first to solve the stress-strain relationship of a part and read these results into
corresponding software to solve the life circle or optimization result. You may choose
any FEM software to solve the stress-strain relationship like Nastran, Abaqus, Ansys, Marc,
etc. And there also exist some software to solve the fatigue like MSC.Fatigue and so forth.
5 Secondary Development
Sum up the secondary development of engineers always use there maybe exist two
typical types should be classified or defined from it.
Ⅰ
-Secondary development and
Ⅱ
- Secondary development should be separately nominated by this paper.
Ⅰ
-Secondary development is a method that the user should project some program
sentences depend on pure numerical algorithm to achieve some functions. This
method indicates the process was derived by strict mathematics relationship like user
may define the concentration force followed boundary conditions for MSC.Marc
software [8] or dynamic mesh for Fluent software [13]. In other words, most of ex-
amples previous paper should be classified to this type. Through this method you may
define some complex material constitutive relations, complex boundary conditions to
develop the solve ability for software.
Ⅱ
- Secondary development is the method that user should connect some software
through some ports and to achieve truly interactive simulation. This method indicates
the interface between software and software. Pre-treatment & post-processing and call
some commands in a software like Visual C++ or Visual Basic from another software
like MATLAB are the most usually used at present. This method will not involve the
mathematics relationship and only some ports to active the function of software have
contained itself. One example is you define the solve conditions in Hypermesh soft-
ware for MSC.Nastran software to solve and you should set some code variables for
MSC.Nastran along. Another example is you should call the magic function in Visual C++
from MATLAB software to easily solve any order magic square by a simple command.
It is maybe very clear to realize the secondary development from this classified.
And as of these expressions you may have an overall realization to interactive simula-
tion and development of simulation at present. Based on these expressions an initial
concept of simulation platform or simulation system should be built in your mind and
it maybe the latest development at present.
6 Simulation Platform
Most ultimate and aspiration form of interactive simulation may be nominated as
simulation platform. It is a new concept advancing and developing in these years.
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