ARMD™ 5.7 G2

Advanced Rotating Machinery Dynamics:
Software for Machinery Design, Analysis, and Troubleshooting

The simulation software ARMD 5.7 developed by the US American company RBTS, Inc. is the most complete rotordynamic software package available to help you evaluate any bearing, rotor / bearing system, or mechanical drive train. Using leading edge technology and a host of valuable capabilities, ARMD has been proven effective and accurate in the design, analysis, and troubleshooting of rotating machinery by machinery manufacturers, equipment packagers and end users around the world.

ARLA distributes the software (including the professional engineering service, software support, update service, etc.) particularly in Germany and other European countries (cooperation with RBTS).

The modular software runs on PC systems with Windows 2000/XP/Vista/7. 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).

ARMD is developed for performing:

• Rotor Dynamics
• Torsional Vibrations
• Fluid-Film Bearings
• Rolling-Element Bearings
• Lubricant Temperature-dependent Properties

ARMD is an integrated analysis package that incorporates state-of-the-art numerical and modeling features giving the ability to evaluate the physical system accurately and efficiently. ARMD is user friendly with options and features that include:

• Context-sensitive help
• Menu and windowing environment
• Inter-module communication and data exchange
• Graphical and text capabilities
• Data range checking
• Advanced file management system
• Advanced mouse support features

ARMD was developed in-house by RBTS' principals who, prior to 1986, were employed at The Franklin Institute Research Laboratory (FIRL). FIRL was an internationally known scientific and engineering organization dating back to 1824. Since 1950, FIRL was a leader in the field of tribology and rotating machinery dynamics. RBTS' principals since the early 50's were, and still are, involved in the area of tribology and machinery dynamics. They have provided industry with engineering technical support and software for the design, development, fabrication, and application of fluid film/rolling element bearings and seals. RBTS has been at the forefront in the development of advanced software for the evaluation of bearings, bearing systems, and vibration associated with rotating machinery and drive trains.

The total package consists of various modules:

ROTLAT™ (Rotor Dynamics Lateral Vibration)

• stability analysis
  (natural frequencies, mode shapes, critical speed map)
• unbalance response (synchronous response)
• time-transient response (non-synchronous response)

TORSION™ (Torsional Vibration)

• stability analysis
  (natural frequencies, mode shapes, Campbell diagrams)
• steady-state response
• time-transient response

VISCOS™ (Lubricant temperature dependent properties)

generating as a function of temperature the following parameters: absolute & kinematic viscosity, specific gravity, weight density, specific heat, heat content, thermal conductivity (more information: Example 1, Example 2)

BEARINGS (Fluid-Film Bearings)

Complete performance predictions of hydrodynamic, hydrostatic, and hybrid lubricated journal, conical and thrust bearings operating in the laminar and/or turbulent regime (including many effects: cavitation, misalignment, pressurized boundaries or grooves, structural deformation, lubricant feed circuitry with specified pressures or restrictors, groove geometry and chamfers).

Configurations that can be evaluated:

COBRA™ Software Package
(Rolling-Element Bearing Analysis)

The rolling-element bearing module COBRA-EHL predicts the performance of up to six bearings of different types mounted on a shaft and experiencing radial, thrust and moment loading. Bearing types include Conrad (radial) ball, angular contact ball, cylindrical roller tapered roller, and spherical roller bearings. The program allows the evaluation of misalignment, offsets, preload,clearance or end-play on bearing performance. Bearing preload from spacer grinding or shimming as well as preload springs is included. Individual bearings can be made to "float". Bearing performance results with COBRA-EHL include ball load distribution, stress distribution, system and individual bearing reaction loads and displacements, Hertz contact stress, B10 life, contact angles, and spring rate (stiffness).

 
ARMD for windows incorporates advanced technical and user interface features with built-in help utilities in each of its modules to simplify modeling, analysis, presentation and interpretation of results. Tutorial and step by step sample sessions with advanced graphical presentation are among the many features implemented in the new version.

The front end of ARMD communicates directly with all preprocessors. Each of the preprocessors is utilized for input data creation, editing, saving, file management, processor communication, and text and graphical presentation of results (more details on the hierarchy of the preprocessors and processors).

With any purchase option, all pre and post processing modules are supplied. For example, if only the STABILITY solution module (ROSTAB) is ordered, the pre and post processor ROTLAT is supplied.

The Tutorial Version of ARMD includes ROTLAT, TORSION, JURNBR and VISCOS. This version includes sample problems of real life machinery and their support bearings for you to examine and familiarize yourself with the various input and output options of ARMD.

General ARMD features:

• user-friendly interface in the Window environment

• advanced project and file management system

• easy data input features supported by tables (data sheets)

• intermodule communication and data exchange
  (data compatibility to all ARMD modules)

• built-in help utilities (context sensitive help)

• advanced graphical presentations

• on-line tutorial and step-by-step sample session

Some applications in which ARMD has been utilized successfully include:

• large turbine generator set for a power plant
  Example: Turbine Generator Set
   
• six stage boiler feed pump
  Example: Model of the Lateral Vibration System
  Example: 1st Mode (Lateral Vibration)
  Example: Critical Speed Map
   
• rotor analysis of an electric motor
  Example: Electric Motor
   
• centrifugal compressor rotor system
  Example: Model of the Lateral Vibration System
  Example: Stability Map
  Example: Critical Speed Map
  Example: Bearing Forces
  Example: Time Transient & Orbit at Bearing Station #8

• pump for a petrochemical processing plant
• synchronous motor driven drive trains
• gear box for a Uranium enrichment plant
• miniature air turbine for a dental drill
• small compressor for an air-conditioner
• pump for an artificial heart
• fuel pump for a jet engine
• electric motor and a spindle drive for a hard disk

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