KnowledgeBase

In addition to the previous range of functions, there is now a new option for specifying load spectra. This is done via the "Type of load spectrum" button in the Calculation Parameters tab for the Gear Unit.

Flexible load spectrum calculations can be activated under the Calculation Parameters tab for the Gear Unit component by selecting "Type of load spectrum" -> "Flexible load spectrum." The parameters for the load cases are then set under the Power Flow tab.

The new Transmission Ratio Element component (transmission_ratio_element) couples the rotational degrees of freedom of any two shafts with a freely selectable transmission ratio. A transmission ratio profile curve can be specified. The ability to flexibly set the transmission ratio in the load spectrum greatly simplifies the modeling of auxiliary units or hydrostats.

Right-click on a shaft in the Model Tree to add the new "Transmission ratio" component.

A transmission-efficiency curve can then be specified as a measurement data database component.

Split FEM gearbox casings

With FVA-Workbench 9.0, gearbox casings can now be imported and meshed as an assembly of individual CAD parts. This helps to avoid errors when merging CAD parts and saves time due to coarser meshing of less important components. This method minimizes errors and speeds up the process.

The parts of the casing are shown as separate components in the Model Tree.

A new Assistant can be used to semi-automatically determine the contact nodes between the casing parts.

Additional new FEM features

Consideration of backlash

The backlash of cylindrical gear stages can now be considered in the overall system in the calculation of the static angle of rotation. This makes it easier to compare the load-free angle of rotation with measurements.

The maximum, minimum, or no backlash can be considered in the system calculation.

Backlash deviations in planetary stages

Backlash deviations between the planets can also be considered in planetary stages. These may be additive to the backlash above.

The meshing backlash deviation (normal section) or angular backlash deviation (transverse section) can be specified for each of the engagements in the planetary stage.

Load capacity and tooth contact of worm gearboxes in the overall system

The calculation of worm stages as part of the system calculation ensures a consistent power flow. The results for the load capacity and the local load distribution are shown in the report.

Improved initial bearing stiffness

The automatically determined initial bearing stiffness and thus the convergence of the overall system has been improved. This is particularly effective for bearings with backlash and low loads.

New features

Bevel gear design according to ISO 23509

The user guidance for bevel gear design according to ISO 23509 has been optimized. The parameters for tooth depth shape, outer circumferential backlash, and chordal tooth thickness factor can now easily be selected. These data can also still be manually specified.

Furthermore, the helix and pressure angles can now be edited for all available gear cutting methods. Protuberances and tip relief can be configured separately for each flank.

The Attribute Help has also been expanded.

Additional new features

SKF calculation service enhancements

The functionality of the SKF calculation service has been significantly expanded. The following additional calculations are now available:

Expansion of rolling bearing calculations in the FVA-Workbench

The internal calculation module for rolling bearings in the FVA-Workbench has been expanded:

Rolling bearing selection dialog

A search field has been added to the rolling bearing selection dialog.

Interference fits

The stress hypotheses for tapered and cylindrical interference fits has been expanded, along with numerous user-friendliness improvements. Calculations can now be performed according to the von Mises deformation hypothesis in addition to the shear stress hypothesis according to DIN 7190. This allows strain hardening curves to be considered in order to more precisely capture the material behavior during partial plasticization.

Spline gear tolerance calculations

The tip and root diameters are now strictly determined according to the base tangent length deviations for spline gear calculations according to DIN 5480. The recommended diameters according to DIN 5480 Table 5 are also output for the different centering types. A sign error that deviated from the basic tolerance H has been corrected when determining the base tangent length of splined hubs.

To simplify the positioning of CAD/FEM components, the FVA-Workbench global coordinate system can now be moved and rotated. To verify the global coordinate origin, right-click in the 3D Model and choose "show coordinate system."

Sub-headers can now be added in the Report Configurator. They help to group the results in the output report. The sub-headers are also shown in the Model Tree. When you click on a sub-header in the Model Tree, the report scrolls to the corresponding position.

Sub-headers are added in the Report Configurator similar to results tables.

Two new buttons have been added to the Model Tree to hide components in the 3D Model and in output reports.

Import of REXS materials and lubricants

The FVA-Workbench also now supports importing database components for materials and lubricants as REXS files to facilitate the integration of custom data sets.

If multiple materials or lubricants are defined in the REXS file, the ones to be imported can be selected in the import dialog.

Support for REXS Version 1.6

Version 1.6 of the REXS format for exchanging gearbox models is now supported. The biggest change compared to version 1.5 is the ability to import and export plain bearings. Plain bearing tables are also supported.

Exporting 3D images of gearbox components

The new exportImage() feature can be used to export the complete gearbox model or individual components as an image. The orientation of the components and the image resolution can be configured. You can also specify whether the gearbox deformation should be considered during the export.

Revision of HTTP request functions

HTTP communication functions have been modified. These are breaking changes; i.e., existing scripts which use these functions must be updated. Essentially, the HTTP response has been packed into an object. This allows the response to be evaluated more accurately.

The following example executes an HTTP request and saves the response to the httpResponse variable. The information in the response, the HTTP status code (status), the status message (message), and the actual data (data) are then extracted and stored in separate variables.

let httpResponse = get('https://exampleurl/result');

let status  = httpResponse.status;
let message = httpResponse.message;
let data    = httpResponse.data;

if(status != 200){
    println("Something went wrong")
}

Components in rolling bearing selection dialog

Rolling bearings can be saved as components in the component library. The ability to select and add rolling bearings stored there via the rolling bearing selection dialog is new.

A rolling bearing can be saved as a component via the context menu.

In addition to manufacturer catalogs, the component library can also be selected as a source in the rolling bearing selection dialog. Stored bearings can be selected from a list based on their geometry parameters.

Component names are automatically pre-assigned when saving

The name is now automatically pre-assigned when creating a new component.

If the FVA-Workbench is used in a network that routes outgoing connections via a proxy server, the proxy server can now be configured in the settings. This configuration may be necessary if the SKF calculation service or scripting functions are used for client-server communication, in particular.

Overview of components for which a database component is used

If a database category such as material or lubricant is selected in the Model Tree, an overview of the gearbox components which use this database entry is now displayed.

Three different materials are used in this example gearbox. The overview shows their use at a glance.

New material groups in the materials database

Several cast aluminum and plastic materials have been added to the materials database.

Design calculation according to ISO 23509

Addtional