WOLFRAM SYSTEM MODELER
SKF_NU_306_ECPRoller bearing parameterized with values corresponding to SKF NU_306_ECP |
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Diagram
Wolfram Language
In[1]:=
SystemModel["RotatingMachinery.RollingBearings.RollerBearings.SKF_NU_306_ECP"]
Out[1]:=
Information
SKF NU 306 ECP
By following this procedure, it is possible to parametrize around 200 SKF cylindrical roller bearings. This specific example is parameterized to model SKF NU 306 ECP.
Catalog Parameters
Catalog parameters are found in the bearing catalog from respective manufacturer, in this case the SKF Catalog [1].
Figure 1 shows the parameters for the NU 306 ECP bearing. These are the values that should be entered in the Catalog Parameters section of the Bearing Dimensions tab.
Figure 1: NU 306 ECP bearing catalog parameters.
System Parameters
The system parameters, which are the clearences need to be set. In the same catalog [2], the radial clearance limits are listed.
Figure 2: Radial internal clearance of NU 306 ECP.
The axial clearance in the NU 306 ECP has been set to 0, since there is no clearance between the outer ring and rollers. This is simply an implementation decision. However, it is recommended to set the radial clearance to -0.001 mm in order to make the simulations more robust. Without this setting, the simulations may generate numerous events as they try to determine whether or not contact is occurring.
Please, note that if you have a system where the bearing-related vibrations are not desired, these values can be set as even larger negative values. This type of adjustment enables you to have preloaded bearings. The axial clearance was set to 0 for the NU 306 ECP, since its outer ring and rollers have no clearance in between.
Other Parameters
To set the parameters not in the catalog, the Other parameters, you need to look at the CAD file given on the SKF website.
Figure 3 Bearing SKF NU 306 ECP CAD taken from the SKF website.
The roller dimensions, roller number and wall width can be measured from this CAD file.
References for Roller Bearing Parameter Values
[1] SKF Group. SKF Catalog, Chapter 6.1. "Single Row Cylindrical Roller Bearings." 2018: 518. https://www.skf.com/binaries/pub12/Images/0901d196802809de-Rolling-bearings---17000_1-EN_tcm_12-121486.pdf
[2] SKF Group. SKF Catalog, Chapter 6.1. "Single Row Cylindrical Roller Bearings." 2018: 508. https://www.skf.com/binaries/pub12/Images/0901d196802809de-Rolling-bearings---17000_1-EN_tcm_12-121486.pdf
Parameters (30)
| useOuterRingFlangeSupport |
Value: false Type: Boolean Description: Use the build in Fixed or connect to an external flange support |
|---|---|
| useShaftFlangeSupport |
Value: true Type: Boolean Description: Use if the rotating shaft (inner ring) is connected to an external component |
| d |
Value: 0.030 Type: Diameter (m) Description: Bearing inner (bore) diameter |
| D |
Value: 0.07230 Type: Diameter (m) Description: Bearing outer diameter |
| B |
Value: 0.019 Type: Distance (m) Description: Bearing width |
| d1 |
Value: 0.045 Type: Diameter (m) Description: Bearing innerring wall outer diamter |
| D1 |
Value: 0.05835 Type: Diameter (m) Description: Outer diameter for roller |
| F |
Value: 0.0405 Type: Diameter (m) Description: Inner diameter for roller |
| s |
Value: 0.0014 Type: Length (m) Description: Cage clearance |
| clearance_z |
Value: 0 Type: Length (m) Description: Clearance in z direction |
| clearance_dr |
Value: -1e-06 Type: Length (m) Description: clearence in radial direction |
| dRoller |
Value: 0.011 Type: Diameter (m) Description: Roller diameter |
| dLength |
Value: B * 0.625 Type: Distance (m) Description: Roller length |
| wallWidth |
Value: B * 0.18 Type: Distance (m) Description: Wall thickness of outer ring |
| numberOfRollers |
Value: 12 Type: Integer Description: Number of rollers |
| useShaftInitiated |
Value: false Type: Boolean Description: true = Shaft will be initiated. Set this to true at left side if no powersource is used |
| torsionalDampingConstant |
Value: 10 Type: RotationalDampingConstant (N⋅m⋅s/rad) Description: Damping constant |
| verticalDampingConstant |
Value: 10 Type: TranslationalDampingConstant (N⋅s/m) Description: Damping constant |
| horisontalDampingConstant |
Value: 10 Type: TranslationalDampingConstant (N⋅s/m) Description: Damping constant |
| outerRingDefect |
Value: false Type: Boolean Description: If an outer ring defect exists |
| addForceOuterRingDefectAmplitude |
Value: 0 Type: Force (N) Description: Size of outer ring defect. Used if outerRingDefect = true |
| axialPosition |
Value: 0 Type: Length (m) Description: Axial position in z direction (used if useOuterRingFlangeSupport = false) |
| horisontalPosition |
Value: 0 Type: Length (m) Description: Horisontal position in x direction (used if useOuterRingFlangeSupport = false) |
| verticalPosition |
Value: 0 Type: Length (m) Description: Vertical position in y direction (used if useOuterRingFlangeSupport = false) |
| animateOuterRing |
Value: false Type: Boolean Description: Animate outer ring |
| animateInnerRing |
Value: true Type: Boolean Description: Animate inner ring |
| animateCage |
Value: true Type: Boolean Description: Animate cage |
| animateRollers |
Value: true Type: Boolean Description: Animate rollers |
| animateRollerForce |
Value: true Type: Boolean Description: Animate roller forces |
| animateOuterRingForce |
Value: false Type: Boolean Description: Animate outer ring forces |
Connectors (3)
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frame_outer |
Type: Frame_a Description: Coordinate system fixed to the component with one cut-force and cut-torque (filled rectangular icon) |
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frame_b |
Type: Frame_b Description: Coordinate system fixed to the component with one cut-force and cut-torque (non-filled rectangular icon) |
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frame_a |
Type: Frame_a Description: Coordinate system fixed to the component with one cut-force and cut-torque (filled rectangular icon) |
Components (7)
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rollerAssembly |
Type: RollerAssembly Description: Model of an assembly of rollers, containing RollerPart components |
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outerRing |
Type: OuterRing Description: Model of the outer ring of an SKF roller bearing |
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innerRing |
Type: InnerRing Description: Model of an inner ring of an SKF roller bearing |
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fixedRotation |
Type: FixedRotation Description: Fixed translation followed by a fixed rotation of frame_b with respect to frame_a |
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shaftInitiated |
Type: ShaftInitiated Description: The main purpose for this component is to initiate a shaft supported with rolling bearings |
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fixedOuter |
Type: Fixed Description: Frame fixed in the world frame at a given position |
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cage |
Type: Cage Description: Model of a cage to be used in roller bearings |
Used in Examples (1)
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RotatingMachinery.Examples.BearingAnalysis Frequency analysis of a bearing defect on a simple shaft mounted on a structure |