SYMOS

Shock and vibration simulation of mechanical systems

SYMOS is a computer program for the analysis of mechanical systems subjected to shock and vibration.
The model is built with rigid bodies connected by elastic or dissipative elements....
SYMOS provides linear and nonlinear analyses.

A postprocessor module allows :
• 3-D animation of the model.
• graphics display of model response.
• some complementary analyses (shock spectrum, Fourier spectrum).

1. Diesel Engine
Vibration isolation of a 2 mass - system

2. Aircraft engine trolley
Handling shock response

3. Road vehicle
Ramdon vibration response

4. Drop table machine Shock
test simulation

SYMOS program applications are multiple : structural motion, flexibily mounted systems calculation, help to shock and vibration test calibrations....
SYMOS program is also used as educational tool for schools and universities.

SYMOS program consists of 4 modules handled by userfriendly menus system :

MODEL

• bodies (1 to 6 degrees of freedom)
• joins
- linear springs
- nonlinear springs
- creation of load/deflection curves
- creation of libraries
- damping : viscous, Coulomb, quadratic,...
- joints , contacts, gaps

LOADING

• static
- externally forces applied to the bodies
- inertia loads (gravity, crash acceleration,...)
- imposed displacements
• transient (response vs. time)
- library of typical shocks (half-sine, versed sine pulses,....)
- creation of input files
• harmonic (response vs. frequency)
- vibrations sinus, aléatoires
- forces tournantes, couples oscillatoires,...

ANALYSES

• modal
• static linear and nonlinear
• transient linear and nonlinear
(large rotation of the model)
• harmonic
• shock spectrum
• Fourier spectrum

RESULTS

• response diagram vs. time or frequency (displacements, velocities, acceleration of the bodies ; forces in the joins).
• 3-D animation of the model