Air Bearing Design Program

Current Release: Quick 4.31 (steady-state rectangular grid solver)
Dyn 4.42 (dynamic solver)
CMLAir 7.05
FESolver 0.95
Release Date: August 19, 2008
New Release:

CMLAir_v705_setup.exe

This release incorporates the new CML Finite Element Solver version 0.95 into the interface. The speed of the Finite Element solver has been improved since the release of version 0.92. Most features supported by Quick 4 are not fully implemented in the Finite Element Solver.

Features not implemented in the Finite Element Solver and CMLAir:
  • Sensitivities
  • Elastic-Plastic contact model
  • User defined slip model
  • Ramp rails
  • Rails that lie below the base recess of the slider.
  • Slider geometry works but it's a bit different than CMLAir/Quick 4. In CMLAir, if a rail with a deeper recess, overlaps a rail with a shallower recess. The recess for the overlapped region will be determined by which rail has a larger rail index value. In the finite element solver, the overlapped region will automatically be at the shallower recess.
  • User defined geometry and regional height adjustments
  • Use existing grid input option (ioldg)
  • Humidity simulations
  • Postprocessor:
    • Massflow Analysis
    • Shear Analysis
    • Pressure Analysis
    • Lube Depletion
    • Massflow plot
Release Date: May 23, 2008 (updated 7/01/08)
New Release:

CMLAir_v704_setup.exe

This release is a small update to CMLAir, Quick 4 and Dyn

CMLAir 7.04 features and changes

  • Modified the air parameters and altitudes. A PowerPoint presentation describing the changes can be found here.
  • Small changes to dynamic solver and interface to better reflect irrelevant parameters for Finite Element simulations.
  • Minor bug fixes and improvements (fixed humidity edit box 6/23/08).
Release Date: May 2, 2008
Development Release:

CML Finite Element Solver  (version 0.92) 

This is a development release of CML's finite element air bearing solver. The solver is still in heavy development but we wanted to give our members a peek at the work we're doing to improve our solvers. The solver can solve many of the air bearing designs that Quick 4 has trouble with. It's still a bit rough around the edges but getting better every day.

Changes in this release:

  • Adaptive meshing has been reworked and should be more robust and easier to understand.
  • Meshing.dat has been modified
  • The solver will attempt to describe lines that define the rail and outer wall boundaries for the mesher.  This results in more accurate representations of the slider. 
  • Output files have been modified.  The intermediate sliderx files are now deleted at the end of the simulation.  The new output files are described in the readme file.
  • The y coordinate of the slider nodes has been corrected.  Previously the nodes output by the solver were a mirror image of the slider in the y direction.
Release Date: A while back (updated 8/01/08)
Previous Release:

Quick428.exe

Some folks are still using Quick 428. This release fixes the expiration date of the solver

Release Date: A while back (updated 8/04/08)
Previous Release:

Dyn439.exe

Some folks are still using Dyn439.exe. This release fixes the expiration date of the solver

Release Date: November 3, 2005 (updated 7/2/08)
Previous Release: CMLAir_v657c_install.exe

CMLAir 6.57 New Features and Changes:

  • Quick 4 is significantly faster and more stable for almost all cases. The speed improvements have been achieved by modifying the grid generation and multigrid portions of the solver.
  • The static results table has been improved.
  • The ability to view real-time simulation results while a simulation is running has been added. This feature is available from the options menu in the solver output window.
  • It is now possible to zoom in and out in the rail design window.
  • New User Defined Geometry allows multiple regions to be specified.
  • BUG FIX: A bug in the interface affecting the importing the xf0 (pitch offset) parameter of dynamics.def has been fixed. Things should be importing correctly now.
  • BUG FIX: (12/6/05) User defined geometry is now generated correctly in the dynamic solver. Also, Dyn439.exe now outputs geom.dat which can be used to cHeck the slider geometry.
  • BUG FIX: (7/17/06) Interface should now support an unlimited number of rails and rail points.

Additional Files: If you plan to run simulations on a Windows95/98/NT computer, the above file is the only one you need. Download the self-extracting archive and run it.

If you plan to use the remote run feature with a UNIX machine, or you wish to use a solver that has been optimized for a specific processor, you will need to use one or more of the following solvers.
  • A more complete description of the CML Air Bearing Dynamic Solver exists, including information regarding the L/UL solver.
  • NOTE: CMLAir is not compatible with the CML Dynamic L/UL Solver.
  • Manual: The updated manual is distributed as on-line help with CMLAir. An older version is also available as an Adobe Acrobat document.
    Description: Solvers: Determines steady state and dynamic flying characteristics of arbitrary rail shapes under user specified run conditions. Quick4 is distributed as a Win32 binary. Dyn4 is distributed as a Linux (i386) or Win32 (i386) binary.

    Interface: MS-Windows 95/NT user interface for Quick4, Quick5, and Dyn4 solver (above). Visual creation of solver input files, local and remote execution functionality, graphical 2-d and 3-d post-processing, on-line help. Distributed with MS-Windows solver binaries. 

    Notes:

     




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