A linear static analysis is an analysis where a linear relation holds between applied forces & displacements. In practice, this is applicable to structural problems where stresses remain in the
linear elastic range of the used material.

A modal or natural frequency analysis (Normal Modes or Eigenvalue Analysis) forms
the basis of several other dynamic analyses, including the modal approach formulations and
response spectrum analysis. In addition, the results of a modal analysis will tell you much about
the dynamic characteristics of the model, including whether or not you really have a dynamic
system at all. For this reason, analysts often run a normal modes analysis first to examine the basic
model dynamics and to check for modeling problems.

Linear-Buckling Analysis calculates buckling load magnitudes that cause buckling and associated
buckling modes. FEA programs provide calculations of a large number of buckling modes and the
associated buckling-load factors (BLF). The BLF is expressed by a number which the applied load
must be multiplied by (or divided - depending on the particular FEA package) to obtain the
buckling-load magnitude.

Transient dynamic analysis (sometimes called time-history analysis) is a technique used to
determine the dynamic response of a structure under the action of any general time-dependent
loads. You can use this type of analysis to determine the time-varying displacements, strains,
stresses, and forces in a structure as it responds to any combination of static, transient, and
harmonic loads.

Any sustained cyclic load will produce a sustained cyclic response (a harmonic response) in a
structural system. Harmonic response analysis gives you the ability to predict the sustained
dynamic behavior of your structures, thus enabling you to verify whether or not your designs will
successfully overcome resonance, fatigue, and other harmful effects of forced vibrations.
Harmonic response analysis is a technique used to determine the steady-state response of a linear
structure to loads that vary sinusoidal (harmonically) with time. The idea is to calculate the
structure's response at several frequencies and obtain a graph of some response quantity (usually
displacements) versus frequency. "Peak" responses are then identified on the graph and stresses
reviewed at those peak frequencies.

Random Response Analysis determines the technique to calculate the response of the structure due
to non-deterministic loads based on probability and statistics. In a random vibration study, loads are described statistically by power spectral density (PSD)
functions. PSD function is a statistical representation of the load time history.

Inertia Relief Method is the anlysis of unconstrained structure e.g. A plane in flight. The applied
loads are balanced by a set of Translational & Rotational accelerations (automatically determined by the solver)
instead of reaction forces (as with "classic" boundary conditions).

Viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics
when undergoing deformation. Viscous materials, like water, resist shear flow and strain linearly
with time when a stress is applied.

Viscoelastic materials have elements of both of these properties and exhibit time-dependent
strain. Whereas elasticity is usually the result of bond stretching along crystallographic planes in an ordered solid, viscosity is the result of the diffusion of atoms or molecules inside
an amorphous material.

STEADY-STATE THERMAL ANALYSIS

Steady-State Thermal Analysis determines temperatures, thermal gradients, heat flow rates, and
heat fluxes in an object that are caused by thermal loads that do not vary over time. A steadystate
thermal analysis calculates the effects of steady thermal loads on a system or component.
A steady-state thermal analysis may be either linear, with constant material properties; or
nonlinear, with material properties that depend on temperature. The thermal properties of most
material do vary with temperature, so the analysis usually is nonlinear. Including radiation effects
or temperature dependent convection coefficient also makes the analysis nonlinear.

TRANSIENT THERMAL ANALYSES

Transient Thermal Analyses determine temperatures and other thermal quantities that vary over
time. The variation of temperature distribution over time is of interest in many applications such
as with cooling of electronic packages or a quenching analysis for heat treatment.
Engineers commonly use temperatures that a transient thermal analysis calculates as input to
structural analyses for thermal stress evaluations. Many heat transfer applications-heat treatment
problems, nozzles, engine blocks, piping systems, pressure vessels, etc.-involve transient thermal
analyses.