SVT Bearings VI

SVT Bearings VI

Owning Palette: Machine Characteristics VIs

Requires: Sound and Vibration Toolkit

Calculates characteristic frequencies or orders of rolling-element bearings or hydrodynamic journal bearings. You must manually select the polymorphic instance you want to use.

Details  

SVT Rolling Elements Bearing

	desired units specifies whether this VI returns characteristic frequencies or orders. 0 Hz (default)—Specifies to return characteristic frequencies. 1 Order—Specifies to return characteristic orders.
	nominal speed [RPM] specifies the rotational speed, in revolutions per minute, of the bearing. Because the calculation of characteristic orders does not require rotational speed information, this VI ignores nominal speed [RPM] when you set desired units to Order. The default is 1200.
	bearing parameters specifies the bearing parameters that this VI uses to calculate characteristic frequencies or orders. Note  This VI does not specify units for pitch diameter and ball/roller diameter. You must use the same unit for pitch diameter and ball/roller diameter. number of rolling elements specifies the number of rolling elements that the bearing contains. The default is 8. pitch diameter specifies the pitch diameter of the bearing. The default is 1. ball/roller diameter specifies the diameter of the balls or rollers. The default is 0.2. contact angle [deg] specifies the contact angle, in degrees, of the bearing. The default is 0.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	outer race frequency returns the characteristic frequency or order of the outer race of the bearing.
	inner race frequency returns the characteristic frequency or order of the inner race of the bearing.
	fundamental train frequency returns the characteristic frequency or order of the fundamental train of the bearing.
	ball spin frequency returns the characteristic frequency or order of the ball spin.
	error out contains error information. This output provides standard error out functionality.

SVT Hydrodynamic Journal Bearing

	nominal speed [RPM] specifies the rotational speed, in revolutions per minute, of the bearing. The default is 1200.
	oil whirl order specifies the characteristic order of oil whirl, which is typically 0.38 to 0.48. The default is 0.45.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	oil whirl frequency returns the characteristic frequency of the oil whirl.
	error out contains error information. This output provides standard error out functionality.

SVT Bearings Details

This VI uses the following equations to calculate characteristic frequencies or orders of a rolling-element bearing.

where f_s is the rotational frequency of the shaft in revolutions per second, and N is the number of rollers or balls.