Dyrobes Full Version
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Please see FAQ731-376 for tips on how to make the best use of Eng-Tips. RE: Rotor Dynamics Modeling Programs WCFoiles (Mechanical)16 Jan 07 10:43Dyrobes is a good program.
XLROTOR uses Excel. Regards,
Bill RE: Rotor Dynamics Modeling Programs HalMcK57 (Mechanical)18 Jan 07 09:48I started using XLRotor about 4 months ago and find it very satisfactory. We looked at XLRotor and DyRoBeS and found them pretty comparable. We selected XLRotor for two main reasons:
1.) Its Excel based format was appealing since I was familiar with it.
2.) We were working with Dr. John Vance (Texas A&M) at the time and he had a great deal of familiarity with the program.
We did speak with another engineer who had knowledge of the DyRoBeS program and thought it to be a good package, but no first-hand knowledge.
They are comparably priced (expensive! - XL was $6K), so I don't think you can go wrong with either of them. The salesman (owner?) from DyRoBeS claimed his product was better than XLRotor for large machines, but we build small engines so it wasn't a concern for me. RE: Rotor Dynamics Modeling Programs cbrn (Mechanical)22 Jan 07 08:50Hi,
I do believe it's worth adding to the list the rotodynamics kernel MADYN. It's extremely powerful if compared both to XL-Rotor and DyRoBeS (allows for kinematic couplings of complex types, has very robust eigenvalues sorting in case of analyses in the complex domain, can calculate data for various types of bearings, can do statics, eigenvectors analyses, transients, harmonic response, spectral analysis, etc...
As far as I know, Dr Klement in Darmstadt is the original developer of the kernel, and you can purchase the "genuine" version of the program from him. Otherwise, there is Madyn2000 which should be based on the Madyn kernel 4 (of some sub-version, I don't remember which one), over which it adds a very user-friendly GUI.
Mathematically speaking, Madyn is in my opinion the most advanced kernel available for rotodynamics.
Regards RE: Rotor Dynamics Modeling Programs johngeren (Aerospace)30 Jan 07 22:38Dyrobes can be used in excel too. You have to save the file as a .txt (just change the extension) file and import it into excel as a .csv After mods change the filename back to the DyRoBes extension and it can be read in (it's still just a text file).
It's good for shafts and symetric systems. It cannot handle things such as car engines from last info I heard from the programmers. I think it's 6-7 K a year. ANSYS can also now handle RD, but I have not used it. RE: Rotor Dynamics Modeling Programs johngeren (Aerospace)30 Jan 07 22:47Oh forgot to mention, Dyrobes developer will call you back the same day if you email him. Dr. Wen Jeng Chen is his name, give him a call or email from the website (search for dyrobes). googletag.cmd.push(function() googletag.display('div-gpt-ad-1406030293255-2'); ); Red Flag This PostPlease let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
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Academic License: Teachers and researchers at educational institutions receive discounts on licenses up to 50%. Academic discounts are occasionally provided to small consultancies. You may contact in...@dyrobes.com to see if you qualify.
DyRoBeS is developed by Eigen Technologies, Inc.. The most popular version of this product among our users is 1.0. The names of program executable files are BePerf.exe, DyRoBeS_Menu.exe and Rotor.exe. The product will soon be reviewed by our informers.
This option calculates the shaft static deflection and bearing/constraint reaction forces for the static determinate and indeterminate problems. The resulting element internal shear forces and bending moments are also derived. The associated stresses are also calculated. The external static loads, gravity, and misalignment are included in this analysis. In the window version of DyRoBeS_Rotor, the finite element stations where linear bearings are located at can be either constrained (zero displacements) or flexible with their bearing stiffnesses being used in the calculation. For multiple speed dependent bearing coefficients, the bearing stiffness at the lowest speed is used. The non-linear bearing and active magnetic bearing stations are still constrained. This window version allows for multiple shaft systems.
Eight lessons in running the demo version of Dyrobes, from install (Module 0) to full examples (Module 3.2). Presented by Rugved Nakade. To view the full playlist, click the menu icon in the top left corner of the video.
The Critical Speed Map calculates the undamped critical speeds for a given range of bearing stiffnesses. The flexible supports were ignored in the Critical Speed Map Analysis before Ver 16.20. That is, the bearings can not be in series before Ver 16.20. The intention for the Critical Speed Map is to examine the rotor flexibility with the support stiffness. So, the bearing stiffness used here is the total equivalent support stiffness if there are bearings in series. However, one may use this analysis to study the effect of that particular bearing stiffness on the critical speed. So, after Ver 16.20, this restriction has been removed. That is, now, it allows bearings in series. However, if you would like to vary the flexible support stiffness, then create a bearing for the flexible support stiffness in the bearing data, and only enter the flexible support mass in the support data. A check box Allow Bearings in Series is added for this option. If the box is checked, then it will allow bearings in series (new feature in Ver 16.20), if the box is unchecked, any flexible supports are ignored, just like old versions.
In Version 6.0 and above, it allows you to vary the stiffnesses of several selected bearings and hold the remaining bearing stiffnesses fixed. In Version 5.0 and below; however, all the bearings are varied with the assumption that all the bearings are identical. This enhanced capability allows you to analyze the multiple shaft systems.
Two types of the generalized non-linear isotropic bearing are provided in this bearing option. This option replaces the previous version for the rolling element bearing with clearance. The journal motion is shown below:
Dyrobes, gl ve ok ynl ve ğrenmesi kolay, eksiksiz bir rotor dinamiği yazılım aracıdır. Dyrobes, rotor dinamik analizi, titreşim analizi, yatak performansı ve Sonlu Eleman Analizine dayalı balans hesaplamaları sunar. Yazılım, en zorlu endstri gereksinimlerini karşılayabilecek gelişmiş modelleme ve analiz yetenekleriyle sezgisel Windows tabanlı bir arabirimi birleştirir.
Dyrobes software has been developed to analyze the bearing steady state and dynamics performance of fixed lobes, pressure dam, multiple pockets, floating ring bushing, flexural pad and tilting pad hydrodynamics journal bearings based on Finite Element Methods. In additional to journal bearing analysis, the program also performs thrust bearing analysis, lubricant properties analysis, and oil flow calculation.
This program calculates the bearing loads due to gear power transmission and aero thrust forces. The gears can be spur gears, helical gears, or double helical gears (herringbone gears). Applications include integrally geared compressors, blowers, pumps, and expanders, etc. Typical compressor system configuration includes a driver unit (motor, engine, turbine, etc.), which drives several high-speed shafts (driven units). The Gear can be either a Driver or Driven Gear. For applications like expander or turbine which high-speed expander/turbine will drive the low speed bull gear and the low speed bull gear becomes the driven unit.
Since the least square method is used to solve the simultaneous equations, the Number of Measured Probes times the Number of Speed Points must be greater than or equal to the Number of Balancing Planes. (NsXNm >= Nb).
Pad crown can be present and modeled for the tilting pad thrust bearing, particularly when the pivot is centrally located. The dam (shroud) can be present at inner and outer diameters for the taper land and step thrust bearings. Currently, only the sector-shape of the pad is allowed for the tilting pad thrust bearing. The tilting pad geometry is specified by the pad circumferential arc length (degree), and the pad inner and outer diameters. However, for the taper land and step bearings (fixed profile geometry bearings), commonly the constant oil groove width is specified instead of the pad arc. For the taper land and step bearings, this program allows for both options: 1. Specify the oil groove with a constant width, or 2. Specify the oil groove with a constant arc at the pitch diameter. Another unique feature is that this program allows for the partial arc bearing (sometimes called horseshoe type) where the bearing does not have a full 360 degrees extent.
Constant viscosity, which only lubricant viscosity and density are required for the inputs. Density is used if turbulence effect is checked. Heat balance. In this option, the lubricant properties as a function of temperature are required for the simple heat balance calculation. However, constant viscosity is still used in the Reynolds equation, and the outlet (exit) temperature is calculated using the flow and power loss equation. Reynolds equation is solved along with the energy equation for the pressure and temperature distribution. This will give accurate temperature distribution and temperature reading at the probe location.
Another useful design feature provided in this program is the multiple runs, which allows the users to perform multiple design iterations to optimize the design. For multiple runs, only the changed parameters are entered in the table, blank and zero entries indicate the parameters are unchanged from the baseline design.
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