MASTA 9.0 Release Notes

Transcription

1 November Smart Manufacturing Technology Ltd. Commercial in Confidence Page 1 of 33

2 MASTA 9.0 Contents and Summary See next section for additional details The 9.0 release of MASTA contains all of the capabilities from previous releases, various additional features and some enhancements to previously included features. Various bug fixes are also included. Areas where you will find new or revised functionality include the following: Gear Whine/Harmonic Excitation Analysis New results available including airborne sound power for a full FE component. Interface improvements to allow more flexibility in the results shown, including showing the response at multiple locations on one plot. Export of operating deflection shapes in op2 file format that can directly be used in acoustic analysis packages. Display of operating deflection shapes in 3D view. Export kinetic or strain energy to raw text output. Frequency range setting now shared across a loadcase and a design. Shaft FE Meshing A new Create Shaft Mesh option is now available as part of the MA115 (Full FE Mesh Advanced Setup) to enable the generation of an FE mesh of a shaft directly within MASTA. FE Component Ability to create or import groups of element faces. These groups are available as result locations in Gear Whine/Harmonic Excitation analysis for surface based results. The Acoustic Radiation Efficiency can be specified for an FE for use in the airborne sound power calculation in a Gear Whine/Harmonic Excitation analysis. A new choice of Link Node Source, Use Nodes from Another Link, is available in Imported FE Mode s Connections tab. Statistics on selected nodes are now displayed in the Node Groups tab. In particular, when two nodes are selected the distance between and midpoint of their locations will be shown. If three nodes are selected, the radius and centre of the circle through them will be shown. Ability to set a Mass Scaling Factor to quickly see the effects of a change in mass on, for example, NVH results. Similar to existing Stiffness Scaling Factor option on load cases. Can specify if the FE model for a gear mesh contains teeth or not, affecting whether MASTA will, by default, only use surface nodes. Colour Map Options A number of new colour map options are now available that are used when displaying, e.g. gear contact charts and stress maps Smart Manufacturing Technology Ltd. Commercial in Confidence Page 2 of 33

3 Bearing Clearance at Mounting Points Improvements to the way rolling bearing mounting options are handled. If thermal expansion and/or fitting effects generate a clearance at a mounting point then this will be automatically included in the analysis. Bearing Support Tolerances The non-contacting diameter for a support tolerance is now user specifiable. Line Selection in 2D Charts A feature which allows selecting lines in 2d charts has been added. Surface Selection in 3D charts A feature which allows hiding/showing surfaces in 3D charts has been added. DRIVA Basic LTCA DRIVA can now use the Basic LTCA model for the gear mesh stiffness. Efficiency Can now view energy input/output/loss and efficiency results over a duty cycle in System Deflection reports. Updated SKF Bearing Data Further bearing design details (element diameter, pitch circle diameter, and number of elements) for SKF catalogue bearings. Flexible Spline Coupling Rigid Connectors can be set up with an Individual Contacts stiffness option with specifiable contact stiffness, pressure angle, helix angle and normal clearance Spacing and sizes of spline teeth can either be equal or specified per-tooth Can be used with Detailed Spline functionality FE Model can be automatically place nodes at each spline tooth, or on each flank of each tooth Effects of spline contacts are accounted for in System Deflection mode Specify Transverse Chamfer Angle The Chamfer Angle in the Transverse Plane can now be specified Smart Manufacturing Technology Ltd. Commercial in Confidence Page 3 of 33

4 Rough Cutter Creation Settings This adds the ability to choose between the minimum, average and maximum tooth thickness for which to create a new cutter. Additionally, it is now possible to specify rough tip and root clearance factors. Rough Hob Creation Enhancements Now uses ½ pitch thickness to define the hob reference height. Semi-topping blade now created if the Gear Design has a valid chamfer definition. Additional Options in RUNNA Users can now save numerical outputs into individual text files. Users can now save all files written out from RUNNA into the.runna file directory. Concentric Group Selection and Movement Concentric Groups can be selected in X,Y view. Users can specify Drawing Order of Concentric Groups in 2D view. CVT Model Improvements Forces and resultant moments on sheaves can be modelled in system deflection Smart Manufacturing Technology Ltd. Commercial in Confidence Page 4 of 33

5 MASTA 9.0 Details Gear Whine/Harmonic Excitation Analysis Airborne Sound Power Using the method of ISO/TS 7849 the airborne sound power is calculated based on the vibration of a full FE component. Several inputs go into the calculation to get a final value. The properties of the air are specified on the design. Combined with the load case air temperature gives the Characteristic Specific Acoustic Impedance. The value of this can be overridden on the load case to use a value other than the calculated one. The other inputs are the acoustic radiation efficiency (see FE Component improvements) and the root mean square velocity calculated from the gear whine/harmonic excitation analysis Smart Manufacturing Technology Ltd. Commercial in Confidence Page 5 of 33

6 Operating Deflection Shapes in 3D view In addition to the existing options to view the coupled or uncoupled mode shapes there are now options to view the operating deflection shapes in the 3D view. Two options are available. Operating Deflection Shapes by Excitation shows the actual deformed shape at a frequency due to a particular excitation, and so can be a combination of several modes. Operating Deflection Shapes by Order combines excitations and harmonics which have the same order, for example planetary meshes, and shows the actual deformed shape for that combination at a given frequency. There are additional contour options available in the 3D view for the normal displacement, velocity and acceleration of a full FE component. This shows the regions most likely to be contributing to the noise Smart Manufacturing Technology Ltd. Commercial in Confidence Page 6 of 33

7 Enhanced Interface for Dynamic Response Charts Following user feedback the interface for the Dynamic Response charts has been updated to improve the functionality and usability. The controls for the charts can now be found at the bottom of the charts. Controls that only affect a single chart are directly below the chart. Common chart controls can be found in the tabs below the charts. The first tab sets the range and type of chart. The second tab allows the excitations that are being shown to be selected. The third tab is used to select the result and result location that is being plotted. The final tab is used to manage groups of nodes that have been defined. Groups of result locations can be created (these can be nodes, parts or FE surfaces depending on the result type). These groups are saved in the MASTA file and are also available on other load cases after creating once Smart Manufacturing Technology Ltd. Commercial in Confidence Page 7 of 33

8 Contour Colour Skew Control This setting, available on the 2D and 3D waterfall charts, allows the adjustment of the colour gradient to increase its resolution at either the top or the bottom ends of the scale. Linear spacing of contour values, the default in previous versions of MASTA, has zero skew. The default for MASTA 9 is a skew of 1, which shows increased contrast at low frequencies and makes peaks more clear Smart Manufacturing Technology Ltd. Commercial in Confidence Page 8 of 33

9 Export Operating Deflection Shapes for Acoustic Analysis The export options for an FE component from a Gear Whine/Harmonic Excitation analysis now include two options for exporting the complex displacements of the full FE model for a speed/frequency sweep. Both options can combine excitations with the same order if required. Operating Deflection Shapes as OP2 File exports complex displacements in a binary format suitable for reading into third-party acoustic solvers. This option will export one file for each excitation or order, containing the full FE mesh as well as the results at every frequency value requested. Operating Deflection Shapes as Plain Text exports complex displacements, velocities or accelerations to a text format suitable for reading into FE packages. This also include the undeformed node coordinates, so that acoustic wrap meshes can interpolate values from the result. This option will export one file for each frequency and excitation (or order) combination. Plain Text Export Additionally, the existing Boundary Conditions as Plain Text option now supports the export of kinetic energy and strain energy for the Imported FE Component. Additionally, the extension for plain text files is now.tsv, or Tab-Separated Values. This file may be viewed in a plain text editor, as before, or conveniently opened directly in Microsoft Excel as a spreadsheet. This may be set as the default option in Microsoft Windows using the context menu option Open With and selecting the Microsoft Excel executable. Enhanced Frequency Controls Each load case now has an associated set of frequency options, which control the generation of frequency values. These values are used when plotting the Dynamic Mesh Forces charts and Dynamic Response charts in NVH mode, when generating data for RUNNA and PST properties, and when exporting results for an Imported FE Component Smart Manufacturing Technology Ltd. Commercial in Confidence Page 9 of 33

10 The options include setting the minimum and maximum frequency of interest, choosing to create data points at coupled modes, creating additional data points, and clustering the additional data points around the modes. These options are useful when generating charts or exported data and finding the best balance between computation time and accuracy. Additionally, all these settings have design defaults, which can be overridden on each load case as required Smart Manufacturing Technology Ltd. Commercial in Confidence Page 10 of 33

11 Shaft FE Meshing A new Create Shaft Mesh option is now available as part of the MA115 (Full FE Mesh Advanced Setup) to enable the generation of an FE mesh of a shaft directly within MASTA. A suitable mesh element size can be automatically calculated or manually specified. Following a System Deflection analysis, stress results on the FE-replaced shaft can be viewed. Following a System Deflection analysis, stress results on the FE-replaced shaft can be viewed. You can find more details in the MASTA Online Help Topics Smart Manufacturing Technology Ltd. Commercial in Confidence Page 11 of 33

12 FE Component Improvements Element Face and Node Groups Groups of element faces and nodes can now be created and saved with a full FE model. Groups that are defined in a mesh file that is imported will be created automatically. Element face groups can be used as a result location in the airborne sound power calculation in a Gear Whine/Excitation Analysis. To create element face groups there are new options to select element faces and surfaces. The surface selection uses the Edge Angle Tolerance property in the Appearance tab Smart Manufacturing Technology Ltd. Commercial in Confidence Page 12 of 33

13 Acoustic Radiation Efficiency This modifies the efficiency of the transmission of sound power depending on the frequency. This value must be determined by testing, full acoustic analysis or experience. There are several options for specifying the value depending on the available data. Use Nodes From Another Link A new choice of Link Node Source, Use Nodes from Another Link, is available in Imported FE Mode s Connections tab. Selecting it will give you a further choice of which other link to source nodes from. The nodes from the selected other link will then be used in reduction and subsequent analyses Smart Manufacturing Technology Ltd. Commercial in Confidence Page 13 of 33

14 Node Statistics Statistics on selected nodes are now displayed in the Node Groups tab. In particular, when two nodes are selected the distance between and midpoint of their locations will be shown. If three nodes are selected, the radius and centre of the circle through them will be shown. Mass Scaling Factor Ability to set a Mass Scaling Factor to quickly see the effects of a change in mass on, for example, NVH results Smart Manufacturing Technology Ltd. Commercial in Confidence Page 14 of 33

15 Gear Mesh Teeth Option Can specify on an FE Link if the FE model for a gear mesh contains teeth or not, affecting whether MASTA will, by default, use solid nodes or only surface nodes (as seen in the search regions tab). Colour Map Options A number of new colour map options are now available that are used when displaying, e.g. gear contact charts and stress maps. The options are available in the Graphics Settings: The previous versions of MASTA used the Jet colour map, which has two significant deficiencies: it is not suitable for users with any form colour-blindness, and it cannot be reproduced in greyscale (for example by a black-and-white printer). The colour maps Morganstemning and Kindlmann are based on recent research in colour perception, located at and Jet and Greyscale colour maps are also provided for backwards compatibility purposes Smart Manufacturing Technology Ltd. Commercial in Confidence Page 15 of 33

16 Morganstemning: Kindlmann: Jet: Greyscale: Bearing Clearance at Mounting Points Improvements to the way rolling bearing mounting options are handled. If thermal expansion and/or fitting effects generate a clearance at a mounting point then this will be automatically included in the analysis. For the inner and outer races (if present) there are a number of new options. For each race the axial mounting can be specified as Left, Right, Both, or None. These correspond to where the shaft or housing abutments are. The clearance and stiffness at these points can be specified. Left Right None Both 2018 Smart Manufacturing Technology Ltd. Commercial in Confidence Page 16 of 33

17 For each race the radial mounting type can be specified as either Interference or Clearance. An Interference mounting will result in an axial stiffness between the race and the shaft, independent of any axial mounting points that are specified. For example, if you specify an Interference mounting but no axial mounting points, then the bearing will not slide relative to the shaft/housing. If the Clearance option is selected then a radial mounting clearance must be specified, and the race will not be axially stiff with respect to the shaft/housing. Hence in this case the shaft/housing can move relative to the race as far as the axial mounting points will allow. Interference Clearance When loading old files with Sliding, Constrained to Left, or Constrained to Right mounting options for a bearing, the bearing will be given a clearance mounting with the appropriate axial mounting points in order to ensure no change in results. If thermal expansion and/or fitting effects are enabled on a load case, then any radial clearance value specified on the bearing will be ignored. In this case the clearance (if there is any) will be calculated using the fitting options and/or the thermal expansion. A new report called Mounting Stiffness Details on a bearing in System Deflection provides stiffness details about the mounting points. The mounting stiffness report does not show values if the bearing in mounted with an interference Smart Manufacturing Technology Ltd. Commercial in Confidence Page 17 of 33

18 The Mounting table in the default report on a bearing in System Deflection will now report the amount of clearance developing due to fitting and/or thermal expansion effects. For example, in the image below we see that with fitting effects there is 0.5 um of interference at the inner race at assembly, then including thermal expansion reduces this to 1.4 um of clearance Smart Manufacturing Technology Ltd. Commercial in Confidence Page 18 of 33

19 Bearing Support Tolerances The Non Contacting diameter for a support tolerance can now be overridden and user specified. Line Selection in 2D Charts A line selection feature has been added which allows for the selection of lines in 2d charts to improve presentation and readability of information. As an example, take the following chart: By selecting a few lines of interest, then right-clicking on the chart and selecting Reset Line Styles, the chart transforms to: 2018 Smart Manufacturing Technology Ltd. Commercial in Confidence Page 19 of 33

20 Surface Selection in 3D Charts A feature which allows for the showing/hiding of surfaces has been added to improve presentation and readability of information. As an example, take the following chart: By right-clicking on the chart, selecting Select Surfaces to View, and then choosing a few surfaces of interest, the chart transforms to: 2018 Smart Manufacturing Technology Ltd. Commercial in Confidence Page 20 of 33

21 DRIVA Basic LTCA In a DRIVA analysis there is now an option to use Basic LTCA for the gear mesh stiffness model. This replaces the previous variation with roll distance option. There is also an option for whether to include microgeometry or not. Efficiency Can now view energy input/output/loss and efficiency results over a duty cycle in System Deflection reports. All the load cases with the Include Efficiency option selected are included in the overall efficiency calculations Smart Manufacturing Technology Ltd. Commercial in Confidence Page 21 of 33

22 Updated SKF Bearing Data An updated bearing catalogue has been provided by SKF for this release of MASTA. Further bearing design details are included which were not previously supplied by SKF, and so were estimated by MASTA, in previous versions (element diameter, pitch circle diameter, and number of elements). Flexible Spline Coupling Rigid Connectors whose Type is set to Concept Spline or Detailed Spline can be set up with an Individual Contacts stiffness option with specifiable contact stiffness, pressure angle, helix angle and normal clearance. Options are found in the Component Report in the Editor tab or in the property view Smart Manufacturing Technology Ltd. Commercial in Confidence Page 22 of 33

23 By default MASTA will set up equally-sized spline teeth at equally spaced angles, but this can also be specified per-tooth. Such an individual contacts stiffness specification will work for cases where the spline halves have not been replaced by Imported FE components, however its main use is in the case where Imported FE Components replace the spline halves. Nodes and search regions can be automatically created in FE Mode. A Has Teeth option on the link is used to specify if your FE Model contains the spline teeth or not. If it does have teeth, a condensation node will be placed at each separate flank with thin search regions. Arrows pointing normal to the flank surface are shown to aid correct alignment of the FE model Smart Manufacturing Technology Ltd. Commercial in Confidence Page 23 of 33

24 If the model does not include teeth, a single node is placed for the centre point of each contact, with a wide search region spanning the whole angular extent of the tooth. Effects of spline contacts are then accounted for in System Deflection mode 2018 Smart Manufacturing Technology Ltd. Commercial in Confidence Page 24 of 33

25 Specify Transverse Chamfer Angle The Chamfer Angle in the Transverse Plane can now be specified as an alternative to the Chamfer Angle which is defined in the normal plane. Rough Cutter Creation Settings This adds the ability to choose between the minimum, average and maximum tooth thickness for which to create a new cutter. These settings can be accessed from the tool bar Edit Settings Gears + Cylindrical Gear Defaults. The default settings are to use the mean average tooth thickness which maintains previous behaviour. The Finished Thickness used to Generate Cutter is relevant when creating a rough cutter that will have a semi-topping blade. The manufactured tip form diameter is at an intersection between the rough-cut shape and the finished flank profile. The tooth thickness of both the rough shape and finish shape is therefore important for chamfer creation. The default for the Gear Tip Clearance Factor can also be set. The Gear Tip Diameter specified in Design mode, the chosen Rough Thickness Used to Generate Cutter, and the Gear Tip Clearance Factor collectively determine the desired tool root dimension. Similarly, the Gear Root Diameter specified in Design mode, the chosen Rough Thickness Used to Generate Cutter, and the Gear Root Clearance Factor collectively determine the desired tool tip dimension Smart Manufacturing Technology Ltd. Commercial in Confidence Page 25 of 33

26 Rough Hob Creation Enhancements An automatically created hob will now have a standard ½ pitch thickness to define the hob reference height. The shape of the hob is unaffected by this change. While the Hob Working Depth Delta will reflect the change to the reference, the Generating Addendum Modification Factor will be unchanged Smart Manufacturing Technology Ltd. Commercial in Confidence Page 26 of 33

27 Additionally, a semi-topping blade will now be created if the Gear Design has a valid chamfer definition. Automatically created rough hobs will generate the rough chamfer shape, which after finishing will give the specified chamfer diameter at the tooth thickness combination chosen in the Rough Cutter Creation Settings. The 2 most common ways of automatically creating a rough cutter are: In Design mode with a Cylindrical Gear Set selected and viewing the Editor tab, press the button named Create New Manufacturing Configuration, selecting the option Create New Suitable Cutters within the dialog box that appears. In Cylindrical Gear Manufacturing Mode, In the right-click context menu for a gear, select Create new Rough Cutter Compatible with Gear in Design Mode Additional Options in RUNNA Two options have been added to RUNNA in order to improve the link between it and HyperStudy. Firstly, numerical outputs can be written into separate text files, one for each numerical result. Setting this options to true will create a folder called "Outputs" in the Working Directory. Within the "Outputs" folder there will be a folder created per run, i.e. Run, Run 1, Run 2 etc. Within these folders, there will be the text files for each output. This will result in a text file containing 4 lines. The first line contains the design entity, the second line contains the path to the selected property, the third line contains the unit (blank if none), and the final line is the value Smart Manufacturing Technology Ltd. Commercial in Confidence Page 27 of 33

28 Secondly, all files created from RUNNA runs can be saved into the same folder as that of the.runna file which is executed by selecting the Save files from run in the same folder as the RUNNA file option. Concentric Group Selection and Movement In order to move all components with the shaft that they are mounted to, it is now possible to select the Concentric Group for the selected shaft in X,Y view Smart Manufacturing Technology Ltd. Commercial in Confidence Page 28 of 33

29 This will select the shaft and all components mounted to the shaft. All components in the group can be moved together. Additionally, users can specify in which order the Concentric Groups are drawn in 2D mode. This function can be accessed in Design Mode at Root Assembly level with the Editor set to Drawing Position : 2018 Smart Manufacturing Technology Ltd. Commercial in Confidence Page 29 of 33

30 This will enable users to manipulate the display of sections of complex models to facilitate viewing Smart Manufacturing Technology Ltd. Commercial in Confidence Page 30 of 33

31 CVT Model Improvements In a CVT design there is now an option to use the improved model. This model improves the representation of forces on the sheaves and enables effects of CVT on the system model to be included in the system deflection. The Clamping Force and Number of Nodes for each pulley can be specified in the load case options alongside the speed ratio Smart Manufacturing Technology Ltd. Commercial in Confidence Page 31 of 33

32 The effects of CVT moments and forces are then accounted for in System Deflection mode Smart Manufacturing Technology Ltd. Commercial in Confidence Page 32 of 33

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