Dyrobes:
New Features and Improvements

Improvements for Ver 21.10

Released October 1, 2020, featuring:

  • Rotor PostProcessor – add option to plot the normalized modal stress (0-1). Default is the normalized plot now. To obtain the non-normalized plot as before, go to Options/Settings and uncheck the Normalized Stress.
  • Rotor – add Asymmetric Rotor Analysis

Improvements for Ver 21.00

Released February 17, 2020, featuring:

  • Base Motion (steady state harmonic base excitation)
  • Include the latest Hasp drivers from Gemalto

Improvements for Ver 20.30

Released October 1, 2019, featuring:

  • BePerf – Add Turbulence effect for the tilting pad bearing
  • Rotor – Fix an input bug for the Bearing Type 10 – General NonLinear Bearing
  • Rotor – Add Element Torque Table for Torsional Startup Transient Analysis requested by Solar Turbine

Improvements for Ver 20.21

Released August 8, 2018, featuring:

  • Add Element Torque Table for Torsional Short Circuit Transient Analysis requested by Solar Turbine
  • Add more digits text output in the transient analysis requested by Curtiss-Wright

Improvements for Ver 20.20

Released April 25, 2018, featuring:

  • Improve numerical integration stability for the Transient Analysis
  • Add cut-off low frequency to eliminate the low frequency noise in the transient analysis due to initial conditions and constant loading
  • Improve the BePerf – Tilting Pad Bearing Advanced Feature option
  • Enhance some Postprocessor Graphics

Improvements for Ver 20.10

Released February 16, 2018, featuring:

  • Add Analysis Type 13 – Morton Effect (optional program)
  • Add Analysis Type 14 – Multiple Analyses for the same rotor file
  • Enhance Postprocessor Graphics in the Time Transient Analysis – Frequency Domain

Improvements for Ver 20.00

Released December 2, 2017, featuring:

  • Add Design Comparison in Rotor to compare different designs:
    1. Compare two different (.rot) files
    2. Same rot file, but different bearing files
    3. Same rot and bearing files, but different bearing variables
  • Add Bearing Type 15 in Rotor. This option allows the Rotor and BePerf to be fully integrated, for linear analysis.
  • Add new features in BePerf for fixed-lobe and tilting pad journal bearing design, including parametric study and design comparison tools.
  • Add or modify more lubricants into the oil library.
  • Transient Analysis in Frequency domain, the initial condition for the high speed point uses the final condition from the previous speed point.
  • In the Transient Analysis, the integration time and time step are important for the FFT plot, therefore, add “Suggested Time Step” feature for the integration time and time step.
  • Add velocity and acceleration in the FFT displays.
  • Add damping factor vs. frequency ratio (API 610) in the Post Processor for the Whirl Speed and Stability Analysis.

Improvements for Ver 19.02

Released May 9, 2017, featuring:

  • Improve the Text Output Format (*.OU2 and *.OU4).
  • Correct some spelling errors.
  • Fix a bug existed in Ver 19.01 in the heat balance calculation for the Fixed Lobe Bearing Type with Advanced Features ON.
  • Fix a graphic error in the torsional mode shape plot when Rigid Link in the Shaft Elements tab is checked to connect two shafts.
  • Batch mode examples for verifications and future expansion – see BatchRunRotor.bat, BatchBePerfTpj.bat, BatchRunLobeDNF.bat, BatchRunReynolds.bat, and BatchRunExample.bat.
  • For more details on recent changes, see Release notes, version 19.02.

Improvements for Ver 19.01

Released January 7, 2017, featuring:

  • Use the latest Safenet (Software Protection Software) drivers.

Improvements in Dyrobes version 19.00

The release of Dyrobes version 19.00 includes:

  • Model Flipping (Reversing) – allows to flip the rotor model (left to right).
  • Models Combining (Merging or Appending) – allows to combine two model files into a single file. This allows users to build the complicated model with multiple rotors one rotor at a time.
  • Add leakage calculation for carbon ring seals – Rotor – Tools – Estimate Carbon Ring Seal Leakage.
  • Add calculation for the maximum allowable residual unbalance per API and ISO specifications.
  • Speed dependent bearing coefficients can be either spline interpolation or linear interpolation in the Rotor program.
  • Add more model checking features to avoid any mistakes in building the rotor model. An element L/D checking feature can be pre-specified in the Preference Settings – Model Display Settings.

Improvements in Dyrobes version 18.30

The release of Dyrobes version 18.30 includes:

  • Add Steady State Harmonic Response Analysis for Coupled Lateral-Torsional-Axial Vibration (Dyrobes Rotor).
  • Add descriptions for the probes and Speeds in the Rotor Balancing Program (RotorBal).
  • Add LabySeal option in the new Main Menu.
  • Rewrite the function “Print to File” for all the figures and animation files.
  • Correct a graphic bug in GearLoad.
  • For more details on recent changes, see Release notes, version 18.30.

Improvements in Dyrobes version 18.20

  • Add water properties into the lubricant library for bearing programs BePerf and ThrustBrg.
  • Add hydrostatic thrust bearing into ThrustBrg.
  • Add circular pad thrust bearing into ThrustBrg.
  • Add summary results in the graphic output into ThrustBrg.
  • For Floating Ring Bearing in Heat Balance Calculation, allow different Inlet Temperatures and Heat Carry Away Factors for the inner and outer films.
  • Increase Stack Size for large rotor models.
  • Add Herrinbone Gears (double – helix) and many other options in GearLoad.
  • For more details on recent changes, see Release notes, version 18.20.

Improvements in Dyrobes version 18.10

  • Allows for different single pad properties, such as preload, offset, arc length, and
    pivot location for each pad in tilting pad bearings.
  • Add inputs & outputs summary in thrust bearing graphic outputs.
  • Fixed bug in thrust bearing graphics for multiple runs
  • Add Reset button in the critical speed map plot to enter the bearing stiffness
    manually
  • Add more general motor driving torque for the torsional startup analysis
    Td = Trated [ Tavg + T1 sin( ω1t + φ1 ) + T2 sin( ω2t + φ2 ) ]
  • For more details on recent changes, see Release notes, version 18.10.

Improvements in Dyrobes version 18.0

  • Added Thrust Bearing and Spiral Face Seal modules.
  • Added more features for the Floating Ring Bearing in both Rotor & BePerf.
  • Improved computational efficiency, including x64.
  • In addition, version 17.0 introduced Lateral-Torsional-Axial coupled vibration for a geared system. In the vibration study of a single rotor system, the lateral, torsional, and axial vibrations are typically decoupled and can be studied separately in general. However, for a geared rotor system with multiple rotors, the lateral, torsional, and axial vibration are coupled through the gear mesh and/or rider ring.