ARMD™ 5.7

One of the main ARMD modules is ROTLAT, which is a finite element based software for performing damped and undamped critical speeds, mode shapes, stability, unbalance response, and time-transient response.

ROTLAT's modeling capabilities include:

• solid, hollow, tapered, and stepped type elements
• cylindrical, conical, tilting-pad, and rolling element type bearings
• gravitational loading
• bearing elevation
• gyroscopic effects
• flexible coupling, casing, foundation flexibility
• material damping in the shaft and foundation

ROTLAT consists of four sub-modules (ROSTAB, ROTORMAP, ROSYNC, RORESP) integrated by ROTLAT's module messenger. The messenger controls the sub-modules to provide a complete lateral vibration analysis environment.

The four sub-modules are embedded in the rotor dynamics environment in order to solve different problems. Look through the following examples; you are certainly convinced of the powerful simulation technology. If you use the Internet Explorer 6.0, you should check the image set-up to ensure the correct resolution for the enlarged images (Help).

ROTLAT analyses results include:

1. Stability Analysis (ROSTAB + ROTORMAP)

• natural frequencies and mode shapes

• growth factors / damping ratios

• rotor orbit directions

• bearing reaction forces

• shaft weight, deflection, and centerline slope

• stability map and critical speed map (ROTORMAP)

2. Unbalance Response Analysis (ROSYNC)
(synchronous response)

• multiple unbalance forces

• magnitude and phase

• dynamic forces and moments

• vibratory amplitudes and orbits

• forces and moments transmitted to bearings and foundation

• foundation vibratory amplitudes

3. Time-Transient Response Analysis (RORESP)
(non-synchronous response)

• gravitational and external force: sinusoidal, step, ramp, and pulse type

• lateral amplitudes

• rotor orbits

• dynamic forces and moments

• dynamic stresses

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