Create / Modify Needle Bearing element

Adams Machinery > Bearing AT > Needle Roller Bearing > Create / Modify Needle Bearing element

Create / Modify Needle Bearing element

Machinery → Bearing AT → Needle Bearing → Element → New/Modify

The dialog box allows you to create Adams View needle bearing element. The bearing geometrical parameters are displayed in the Basic Dimensions from Property File part of the General tab.

Main

Figure 99 Create needle bearing element dialog box - general

For the options	Do the following
Bearing Name	Enter the name of the bearing
Def. by.	Select the method of bearing element creation ■2 Parts; Ref Marker -> Select the reference marker to locate and orient new bearing element on any part; select shaft part and block part to attached new bearing element ■2 Markers -> Select markers on shaft part and block part to locate and orient new bearing element Note: Z-axis of reference marker defines rotational axis of bearing element
For the 2 Parts; Ref. Marker option you need to specify the Shaft Part and Block Part and one Reference marker to define unique location.
Ref. Marker	Select the bearing reference marker to define unique location and orientation of the bearing element. Note: The orientation of the Z axis can be flipped by the "Z axis +" / "Z axis -" radio button.
Shaft Part	Select the shaft part in your model to attach the bearing inner ring to. The marker will be automatically created on the selected part.
Block Part	Select a marker on the block part in your model to attach the bearing outer ring to. This is reference marker of bearing.
For the 2 Markers option you need to specify the Shaft Marker and Block Marker on respective parts to define both, the connectivity and location / orientation of the bearing element. Note: With this option you effectively define initial displacement of bearing rings relative to each other.
Shaft Marker	Select a marker on the shaft part in your model to attach the bearing inner ring to.
Block Marker	Select a marker on the block part in your model to attach the bearing outer ring to. This is reference marker of bearing.
Needle Property File	Browse the needle bearing property file (*.npf)
Microgeometry Modif. Name	Select one of the contact property files including micro-geometry variants you have preprocessed previously.

General

For the options	Do the following
Number of Needles	You can adjust the value of input from the preprocessing phase for Adams simulation. Default value as specified in the *.npf property file; a maximum of 150 rollers is supported.
Total Radial Clearance	It is radial operating clearance determined on a fitted bearing still warm from operation. It is defined as the amount by which the inner ring can be moved in a radial direction from one extreme position to the other in relation to the outer ring. The total radial clearance can be positive or negative. In case of negative clearance, the rolling elements are already preloaded at the design position The default value is 0.0

For the options

Do the following

Number of Needles

You can adjust the value of input from the preprocessing phase for Adams simulation.

Default value as specified in the *.npf property file; a maximum of 150 rollers is supported.

Total Radial Clearance

It is radial operating clearance determined on a fitted bearing still warm from operation. It is defined as the amount by which the inner ring can be moved in a radial direction from one extreme position to the other in relation to the outer ring. The total radial clearance can be positive or negative. In case of negative clearance, the rolling elements are already preloaded at the design position

The default value is 0.0

Damping

Figure 100 Create needle bearing element dialog box – Damping tab

For the options	Do the following
Damping Factor for translation	Damping force is applied per needle, when the compression of the needle is increasing. The damping force is defined by following equation Damping_force = roller_load * ( tran_velocity * damping factor ) Default: 0.01
Damping Limit for translation	If the expression ( tran_velocity * damping factor ) exceeds the Damping Limit, then the damping force is becoming: Damping_force = roller_load * damping limit Note: Very high damping can slow down the integrator. The Damping Limit was introduced to prevent unintentional high damping. Default: 0.01
Damping factor for misalignment	Damping torque is applied per needle, when the compression of the needle is increasing. The damping torque is defined by following equation Damping_torque = roller_torque * ( ang_velocity * damping factor ) Default: 0.01
Damping limit for misalignment	If the expression ( ang_velocity * damping factor ) exceeds the Damping Limit, then the damping torque is becoming: Damping_torque = roller_torque * damping limit Note: Very high damping can slow down the integrator. The Damping Limit was introduced to prevent unintentional high damping. Default: 0.01

Visual

Figure 101 Create needle bearing element dialog box - visual

For the options	Do the following
Max.load (Graphics Only)	Enter value of maximum needle load. This parameter is used as load threshold for animations, when color of the needle indicate the level of loading. The needle is colored red, when the needle load reaches the value of specified load. This color code (Figure 102) is activated, by the option menu from Bearing AT -> Animation Settings.
Ring Visibility	Toggle ON or OFF to put the Inner and Outer ring visible or invisible state
Graphic Outer Ring Angle Extent	Adjust this parameter to take a look into the bearing (Figure 103). A portion of the outer ring from this input till 360 degrees is not displayed.
Force Display	Set to whether you want to display force graphics for shaft part or none.

Figure 102 Max. load color coding

Figure 103 Graphics outer ring and ring visibility