Questions about iSTRDYN:
Q: Why would
iSTRDYN be used instead of a regular rotor dynamics program?
provides significantly more accuracy than traditional beam
element rotor-bearing programs. Beams overstate
stiffness of conical structures, used in many rotating
machines, and do not represent disk flexibility at all.
Calculations for rolling element and fluid film bearings are
embedded directly in iSTRDYN,
rather than being inefficiently linked to other programs
with assumed load distributions.
Q: Why would
iSTRDYN be used instead of a general purpose finite element
While general purpose FEA codes do have 2D axisymmetric
elements, none of these programs are particularly well
suited to rotor dynamics. For instance, defining a set
of speed dependent linear support coefficients is difficult,
and performing any bearing iterations is strictly a manual
is specifically oriented towards rotor-bearing systems, and
is not trying to supplant the more general codes. It
will take substantially more time to perform an analysis of
a rotating machine using a general purpose FEA code,
assuming the program can handle all speed dependent effects
such as gyroscopics, than with
Q: If I install
iSTRDYN on a network,
can it be used by several people?
Absolutely! The program has been designed to be
installed on a LAN, and operates very efficiently in this
client-server arrangement. Multiple users can have the
client installed on their local desktops, and when ready to
run an analysis, the server takes over and performs the
calculations, sending the results back to the client when
completed. Each analysis is treated independently by the
server, so several people can be running the program at one
Q: How do I obtain a copy of
The program is normally distributed by
downloading one of two versions
- the first for a local install, the second for access over
the Internet. For customers who require a hard version
of the distribution, such as on a CD, this is an option but
may incur sales taxes.
Q: How much does
There are numerous pricing options available to acquire
the program. Please contact us
to discuss your particular needs. In general, it is
more expensive than traditional rotor dynamics programs but
less than a general purpose FEA code. Similar to CFD
is not purchased outright but leased for a specific time
Q: What happens if I have trouble using
We will fully support our product. If you are
having difficulties getting results, we will assist you
directly, even over the phone. When you call us, you
will be talking with an engineer familiar with the program,
not some call center. You can send us your
model file and we'll take a look to offer advice. We
will also provide training and installation support if
desired. Please refer to our
support page for more information.
Q: Is there a User's Manual for
Like most modern programs, there is no separate User
Manual. The program has a comprehensive help system
that explains all features and options. The help files
are opened as a separate task on the desktop and can be
referred to while interacting with the program. We
also offer direct support, training, and consulting services
such as building models for inexperienced users.
Q: Who is DynaTech Software LLC?
A company formed from
Inc. and a group of private investors with the objective
to design, develop, and market
iSTRDYN to the
rotating machinery community. Half of the design and
development funding came from a US Air Force SBIR contract.