You are here: NI Home > Support > Product Reference > Manuals > Sound and Vibration Measurement Suite 7.0 Help

Owning Palette: Torsional Vibration Measurement VIs

Installed With: Sound and Vibration Measurement Suite

Calculates torsional vibration signals from digital tachometer signals. This VI can return torsional vibration signals as either waveform signals or even-angle signals. The data type you wire to the digital tacho info input determines the polymorphic instance to use.

Example

Use the pull-down menu to select an instance of this VI.

Select an instance OAT Torsional Vibration (Digital Tacho) (Waveform) (1 Ch)OAT Torsional Vibration (Digital Tacho) (Waveform) (N Ch - 1 Setting)OAT Torsional Vibration (Digital Tacho) (Waveform) (N Ch - N Settings)OAT Torsional Vibration (Digital Tacho) (Even-Angle) (1 Ch)OAT Torsional Vibration (Digital Tacho) (Even-Angle) (N Ch - 1 Setting)OAT Torsional Vibration (Digital Tacho) (Even-Angle) (N Ch - N Settings)

OAT Torsional Vibration (Digital Tacho) (Waveform) (1 Ch)

	compensate geometric imperfection? specifies whether to apply compensation to the geometric imperfection of the tachometer system. The default is FALSE.
	reset? specifies the initialization of the internal states. If reset? is TRUE, or when the VI first runs, the internal states initialize to zero. If reset? is FALSE, this VI sets the internal states to the final states from the previous call to the VI. The default is FALSE.
	digital tacho info specifies the tachometer information from the digital input channel of the counter device. tacho counts specifies the counter value at each tachometer pulse. The default is 0. counter timebase [Hz] specifies the frequency of the counter clock in hertz. The default is 1,000. counter task type specifies how this VI measures tachometer pulses. 0 period measurement—Specifies tacho counts as the count between two sequential pulses. 1 event counting—(Default) Specifies tacho counts as the count from the measurement start time to the pulse arrival time. counter digit specifies the number of digits the counter generates. The default is 32.
	pulse/revolution specifies the number of pulses the tachometer generates during each revolution. The default is 1.
	torsional vibration units specifies the units of the output torsional vibration signal. 0 RPM (Default) 1 deg/s 2 rad/s
	error in describes error conditions that occur before this node runs. The default is no error. If an error occurred before this node runs, the node passes the error in value to error out. This node runs normally only if no error occurred before this node runs. If an error occurs while this node runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this node ran or FALSE (checkmark) to indicate a warning or that no error occurred before this node ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning. The default is an empty string.
	output interval [s] specifies the time interval, in seconds, for which this VI returns the torsional vibration signal. The default is 0.001.
	torsional vibration signal returns the waveform torsional vibration signal of the input digital tachometer signal.
	speed profile returns information about the tachometer pulse arrival time and the rotational speed at each pulse. time [s] returns the arrival time, in seconds, of each tachometer pulse. speed [RPM] returns the rotational speed, in revolutions per minute, of each tachometer pulse.
	unit label returns the units of the torsional vibration signal.
	error out contains error information. If error in indicates that an error occurred before this node ran, error out contains the same error information. Otherwise, it describes the error status that this node produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning.

OAT Torsional Vibration (Digital Tacho) (Waveform) (N Ch - 1 Setting)

	compensate geometric imperfection? specifies whether to apply compensation to the geometric imperfection of the tachometer system. The default is FALSE.
	reset? specifies the initialization of the internal states. If reset? is TRUE, or when the VI first runs, the internal states initialize to zero. If reset? is FALSE, this VI sets the internal states to the final states from the previous call to the VI. The default is FALSE.
	digital tacho info specifies the tachometer information from the digital input channel of the counter device for each channel. tacho counts specifies the counter value at each tachometer pulse. The default is 0. counter timebase [Hz] specifies the frequency of the counter clock in hertz. The default is 1,000. counter task type specifies how this VI measures tachometer pulses. 0 period measurement—Specifies tacho counts as the count between two sequential pulses. 1 event counting—(Default) Specifies tacho counts as the count from the measurement start time to the pulse arrival time. counter digit specifies the number of digits the counter generates. The default is 32.
	pulse/revolution specifies the number of pulses the tachometer generates during each revolution. The default is 1.
	torsional vibration units specifies the units of the output torsional vibration signal. 0 RPM (Default) 1 deg/s 2 rad/s
	error in describes error conditions that occur before this node runs. The default is no error. If an error occurred before this node runs, the node passes the error in value to error out. This node runs normally only if no error occurred before this node runs. If an error occurs while this node runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this node ran or FALSE (checkmark) to indicate a warning or that no error occurred before this node ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning. The default is an empty string.
	output interval specifies the time interval, in seconds, at which this VI returns the torsional vibration signals. The default is 0.001.
	torsional vibration signals returns the waveform torsional vibration signals of the digital tachometer signals.
	speed profiles returns information about the tachometer pulse arrival time and the rotational speed at each pulse for each channel. time [s] returns the arrival time, in seconds, of each tachometer pulse. speed [RPM] returns the rotational speed, in revolutions per minute, of each tachometer pulse.
	unit labels returns the units of the torsional vibration signals.
	error out contains error information. If error in indicates that an error occurred before this node ran, error out contains the same error information. Otherwise, it describes the error status that this node produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning.

OAT Torsional Vibration (Digital Tacho) (Waveform) (N Ch - N Settings)

	compensate geometric imperfection? specifies whether to apply compensation to the geometric imperfection of the tachometer system. The default is FALSE.
	reset? specifies the initialization of the internal states. If reset? is TRUE, or when the VI first runs, the internal states initialize to zero. If reset? is FALSE, this VI sets the internal states to the final states from the previous call to the VI. The default is FALSE.
	digital tacho info specifies the tachometer information from the digital input channel of the counter device for each channel. tacho counts specifies the counter value at each tachometer pulse. The default is 0. counter timebase [Hz] specifies the frequency of the counter clock in hertz. The default is 1,000. counter task type specifies how this VI measures tachometer pulses. 0 period measurement—Specifies tacho counts as the count between two sequential pulses. 1 event counting—(Default) Specifies tacho counts as the count from the measurement start time to the pulse arrival time. counter digit specifies the number of digits the counter generates. The default is 32.
	pulse/revolution specifies, for each channel, the number of pulses the tachometer generates during each revolution. The default is 1.
	torsional vibration units specifies the units of the output torsional vibration signal. 0 RPM (Default) 1 deg/s 2 rad/s
	error in describes error conditions that occur before this node runs. The default is no error. If an error occurred before this node runs, the node passes the error in value to error out. This node runs normally only if no error occurred before this node runs. If an error occurs while this node runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this node ran or FALSE (checkmark) to indicate a warning or that no error occurred before this node ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning. The default is an empty string.
	output interval specifies the time interval, in seconds, at which this VI returns the torsional vibration signals. The default is 0.001.
	torsional vibration signals returns the waveform torsional vibration signals of the digital tachometer signals.
	speed profiles returns information about the tachometer pulse arrival time and the rotational speed at each pulse for each channel. time [s] returns the arrival time, in seconds, of each tachometer pulse. speed [RPM] returns the rotational speed, in revolutions per minute, of each tachometer pulse.
	unit labels returns the units of the torsional vibration signals.
	error out contains error information. If error in indicates that an error occurred before this node ran, error out contains the same error information. Otherwise, it describes the error status that this node produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning.

OAT Torsional Vibration (Digital Tacho) (Even-Angle) (1 Ch)

	reset? specifies the initialization of the internal states. If reset? is TRUE, or when the VI first runs, the internal states initialize to zero. If reset? is FALSE, this VI sets the internal states to the final states from the previous call to the VI. The default is FALSE.
	digital tacho info specifies the tachometer information from the digital input channel of the counter device. tacho counts specifies the counter value at each tachometer pulse. The default is 0. counter timebase [Hz] specifies the frequency of the counter clock in hertz. The default is 1,000. counter task type specifies how this VI measures tachometer pulses. 0 period measurement—Specifies tacho counts as the count between two sequential pulses. 1 event counting—(Default) Specifies tacho counts as the count from the measurement start time to the pulse arrival time. counter digit specifies the number of digits the counter generates. The default is 32.
	pulse/revolution specifies the number of pulses the tachometer generates during each revolution. The default is 1.
	torsional vibration units specifies the units of the output torsional vibration signal. 0 RPM (Default) 1 deg/s 2 rad/s
	error in describes error conditions that occur before this node runs. The default is no error. If an error occurred before this node runs, the node passes the error in value to error out. This node runs normally only if no error occurred before this node runs. If an error occurs while this node runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this node ran or FALSE (checkmark) to indicate a warning or that no error occurred before this node ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning. The default is an empty string.
	even-angle torsional vibration signal returns the even-angle torsional vibration signal of the input digital tachometer signal. r0 returns the starting index value for counting revolutions. dr returns the revolution interval between two sequential samples. Y returns the value of the even-angle-spaced sample in a scaled engineering unit.
	even-angle channel info returns information about the measurement configuration for the even-angle torsional vibration signal.
	speed profile returns information about the tachometer pulse arrival time and the rotational speed at each pulse. time [s] returns the arrival time, in seconds, of each tachometer pulse. speed [RPM] returns the rotational speed, in revolutions per minute, of each tachometer pulse.
	position info returns the position information of the even-angle torsional vibration signal. positions [s] returns the locations of the samples, in seconds. samples/rev returns the number of samples in one revolution.
	unit label returns the units of the torsional vibration signal.
	error out contains error information. If error in indicates that an error occurred before this node ran, error out contains the same error information. Otherwise, it describes the error status that this node produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning.

OAT Torsional Vibration (Digital Tacho) (Even-Angle) (N Ch - 1 Setting)

	reset? specifies the initialization of the internal states. If reset? is TRUE, or when the VI first runs, the internal states initialize to zero. If reset? is FALSE, this VI sets the internal states to the final states from the previous call to the VI. The default is FALSE.
	digital tacho info specifies the tachometer information from the digital input channel of the counter device for each channel. tacho counts specifies the counter value at each tachometer pulse. The default is 0. counter timebase [Hz] specifies the frequency of the counter clock in hertz. The default is 1,000. counter task type specifies how this VI measures tachometer pulses. 0 period measurement—Specifies tacho counts as the count between two sequential pulses. 1 event counting—(Default) Specifies tacho counts as the count from the measurement start time to the pulse arrival time. counter digit specifies the number of digits the counter generates. The default is 32.
	pulse/revolution specifies the number of pulses the tachometer generates during each revolution. The default is 1.
	torsional vibration units specifies the units of the output torsional vibration signal. 0 RPM (Default) 1 deg/s 2 rad/s
	error in describes error conditions that occur before this node runs. The default is no error. If an error occurred before this node runs, the node passes the error in value to error out. This node runs normally only if no error occurred before this node runs. If an error occurs while this node runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this node ran or FALSE (checkmark) to indicate a warning or that no error occurred before this node ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning. The default is an empty string.
	even-angle torsional vibration signals returns the even-angle torsional vibration signals of the digital tachometer signals. r0 returns the starting index value for counting revolutions. dr returns the revolution interval between two sequential samples. Y returns the value of the even-angle-spaced sample in a scaled engineering unit.
	even-angle channel info returns information about the measurement configuration for the even-angle torsional vibration signals.
	speed profiles returns information about the tachometer pulse arrival time and the rotational speed at each pulse for each channel. time [s] returns the arrival time, in seconds, of each tachometer pulse. speed [RPM] returns the rotational speed, in revolutions per minute, of each tachometer pulse.
	position info returns the position information of the even-angle torsional vibration signals. positions [s] returns the locations of the samples, in seconds. samples/rev returns the number of samples in one revolution.
	unit labels returns the units of the even-angle torsional vibration signals.
	error out contains error information. If error in indicates that an error occurred before this node ran, error out contains the same error information. Otherwise, it describes the error status that this node produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning.

OAT Torsional Vibration (Digital Tacho) (Even-Angle) (N Ch - N Settings)

	reset? specifies the initialization of the internal states. If reset? is TRUE, or when the VI first runs, the internal states initialize to zero. If reset? is FALSE, this VI sets the internal states to the final states from the previous call to the VI. The default is FALSE.
	digital tacho info specifies the tachometer information from the digital input channel of the counter device for each channel. tacho counts specifies the counter value at each tachometer pulse. The default is 0. counter timebase [Hz] specifies the frequency of the counter clock in hertz. The default is 1,000. counter task type specifies how this VI measures tachometer pulses. 0 period measurement—Specifies tacho counts as the count between two sequential pulses. 1 event counting—(Default) Specifies tacho counts as the count from the measurement start time to the pulse arrival time. counter digit specifies the number of digits the counter generates. The default is 32.
	pulse/revolution specifies, for each channel, the number of pulses the tachometer generates during each revolution. The default is 1.
	torsional vibration units specifies the units of the output torsional vibration signal. 0 RPM (Default) 1 deg/s 2 rad/s
	error in describes error conditions that occur before this node runs. The default is no error. If an error occurred before this node runs, the node passes the error in value to error out. This node runs normally only if no error occurred before this node runs. If an error occurs while this node runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this node ran or FALSE (checkmark) to indicate a warning or that no error occurred before this node ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning. The default is an empty string.
	even-angle torsional vibration signals returns the even-angle torsional vibration signals of the digital tachometer signals. r0 returns the starting index value for counting revolutions. dr returns the revolution interval between two sequential samples. Y returns the value of the even-angle-spaced sample in a scaled engineering unit.
	even-angle channel info returns information about the measurement configuration for the even-angle torsional vibration signals.
	speed profiles returns information about the tachometer pulse arrival time and the rotational speed at each pulse for each channel. time [s] returns the arrival time, in seconds, of each tachometer pulse. speed [RPM] returns the rotational speed, in revolutions per minute, of each tachometer pulse.
	position info returns the position information of the even-angle torsional vibration signals. positions [s] returns the locations of the samples, in seconds. samples/rev returns the number of samples in one revolution.
	unit labels returns the units of the even-angle torsional vibration signals.
	error out contains error information. If error in indicates that an error occurred before this node ran, error out contains the same error information. Otherwise, it describes the error status that this node produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning.

Example

Refer to the Torsional Vibration Measurement (Digital Tacho) VI in the labview\examples\Order Analysis\Torsional Vibration directory for an example of using the OAT Torsional Vibration (Digital Tacho) VI.