WOLFRAM SYSTEM MODELER
NSK_NU_207_EWRoller bearing parameterized with values corresponding to NSK NU 207 EW |
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Diagram
Wolfram Language
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SystemModel["RotatingMachinery.RollingBearings.RollerBearings.NSK_NU_207_EW"]
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Information
NSK NU 207 EW
This component is included for demonstration purposes. It shows how to specify data from a specific NSK bearing type. By following this procedure, it is possible to parametrize around 240 NSK cylindrical roller bearings. This specific example is parameterized to model NSK NU 207 EW.
Catalog Parameters
Figure 1 shows the parameters for the NSK NU 207 EW bearing. These are the values that should be entered in the Catalog Parameters section of the Bearing Dimensions tab. This example is taken from the NSK Catalog [1].
Figure 1: NSK NU 207 EW bearing catalog parameters.
As seen in the catalog above, it is not possible to find all corresponding parameters. The parameters that are not listed in the catalog can be found in the CAD file, NSK Drawing.
Figure 2:NSK NU 207 EW CAD, diameter measurements.
Bearing inner ring wall outer diameter, d1, and outer diameter for roller can be measured from the CAD file, as seen above.
System Parameters
In the same catalog [2], the radial clearance limits are listed as follows:
Figure 3: Radial internal clearance of NSK NU 207 EW
The axial clearance in the NSK NU 207 EW has been set it 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 -0.001mm 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.
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 in NU 306 ECP was set 0, since its outer ring and rollers have no clearance in between.
Other Parameters
Finally, for the other parameters, you can look at the CAD file given on NSK Drawing.
Figure 4: NSK NU 207 EW CAD, roller measurements
The roller diameter (10.93mm), roller length(7.82mm), roller number(11) and wall width(4.59mm) can be measured from this CAD file.
References for Roller Bearing Parameter Values
[1] NSK. Rolling Bearings. "Single-Row Cylindrical Roller Bearings." NU 207 EW. (No date): 118 (B88 in the PDF). https://www.fagbearing.cc/PDF-bearings/NSK-Rolling-Bearings-PDF.pdf.
[2] NSK. Rolling Bearings. "Single-Row Cylindrical Roller Bearings." NU 207 EW. (No date): A90 in the PDF.https://www.fagbearing.cc/PDF-bearings/NSK-Rolling-Bearings-PDF.pdf.
Parameters (30)
| useOuterRingFlangeSupport |
Value: false Type: Boolean Description: Use the build in Fixed or connect to an external flange support |
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| useShaftFlangeSupport |
Value: true Type: Boolean Description: Use if the rotating shaft (inner ring) is connected to an external component |
| d |
Value: 0.035 Type: Diameter (m) Description: Bearing inner (bore) diameter |
| D |
Value: 0.072 Type: Diameter (m) Description: Bearing outer diameter |
| B |
Value: 0.017 Type: Distance (m) Description: Bearing width |
| d1 |
Value: 0.0604 Type: Diameter (m) Description: Bearing innerring wall outer diamter |
| D1 |
Value: 0.06587 Type: Diameter (m) Description: Outer diameter for roller |
| F |
Value: 0.044 Type: Diameter (m) Description: Inner diameter for roller |
| s |
Value: 0.0012 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: 0.01093 Type: Diameter (m) Description: Roller diameter |
| dLength |
Value: 0.00782 Type: Distance (m) Description: Roller length |
| wallWidth |
Value: 0.00459 Type: Distance (m) Description: Wall thickness of outer ring |
| numberOfRollers |
Value: 11 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 (3)
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RotatingMachinery.Examples.BearingAnalysis Two roller bearings on flexible supports |
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RotatingMachinery.Examples.BearingAnalysis Comparison bearings from a selection list |
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RotatingMachinery.Examples.BearingAnalysis Study of individual roller forces |