Dyrobes: New Features and Improvements

Improvements for Ver 23.10

Released July 1, 2025, featuring:

  • Rotor – Improve Torsional Analysis and Graphics with Reciprocating Excitations.
  • Rotor – Tools – Improve Equivalent Torsional Stiffness calculation.
  • Rotor – Torsional Analysis, the nonlinear coupling with dynamic magnifier for the damping. For the time transient analysis without specifying the excitation frequency, such as speed, etc., the first natural frequency will be used.
  • BePerf – Improve the graphics for the Non-Dimensional Analysis.

Improvements for Ver 23.00

Released January 1, 2025, featuring:

  • Add option to open “chm” help file under MENU Help. The .chm files are also the manual files, double click can also open it.
  • Rotor – Add option to display certain section of the Mode Shapes. Mainly used for the multiple shafts systems to display certain rotor motion.
  • BePerf – Add Supply Oil Flow for the fixed-lobe bearings. Note: 0 is the default value which indicates the side leakage will be used in the heat balance calculation.
  • Rotor – Add an add-on module to import the data from pdf file.

Improvements for Ver 22.01

Released September 1, 2023, featuring:

  • Rotor – Add mode shapes in the Critical Speed Map Analysis
  • BePerf – Add more numerical digits in the tabulated outputs
  • BePerf – Improve calculation accuracy for tilting pad bearings with extremely small L/D ratio.

Improvements for Ver 22.00

Released March 1, 2023, featuring:

  • Rotor – Increased the memory stack size, so the users can run with larger models.

Improvements for Ver 21.31

Released November 8, 2022, featuring:

  • Rotor – Fixed an issue in plotting the Bearing Transmitted Forces in the Steady State Synchronous Response Analysis.
  • Rotor – Fix the format using Import *.xls file
  • Rotor Compiler Optimization Settings – Use Default instead of Max Speed

Improvements for Ver 21.30

Released May 12, 2022, featuring:

  • Rotor – Fixed a bug in plotting the Foundation Coordinate Response in the Steady State Synchronous Response Analysis.

Improvements for Ver 21.20

Released August 1, 2021, featuring:

  • Rotor – Replaced the simplified asymmetric rotor analysis in Ver 21.10 with more general finite element approach. The option for the simplified model will be removed in the next release V22 in the future. See V21_Asymmetric_Rotor_Examples_Part2.pdf

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.