RGYRO

Bulk Data Entry Includes data required to perform Rotor Dynamics analysis in Modal Frequency Response Analysis and/or Modal Complex Eigenvalue Analysis. The RGYRO Bulk Data Entry is referenced by a corresponding RGYRO Subcase Information Entry in a specific subcase.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
RGYRO	`RID`	`SYNCFLG`	`REFROTR`	`SPDUNIT`	`SPDLOW`	`SPDHIGH`	`SPEED`

Example

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
RGYRO	14	ASYNC	3	FREQ			55

Definitions

Field	Contents	SI Unit Example
`RID`	<INTEGER> setid: The `SID` is referenced by a RGYRO card in the Subcase Information section.
`SYNCFLG`	SYNC Synchronous Rotor dynamic analysis is selected, if SYNC is input in this field. ASYNC Asynchronous Rotor dynamic analysis is selected, if ASYNC is input in this field. No default
`REFROTR`	rotid Reference rotor ID. This field selects the rotor that will be used in the Rotor dynamic analysis. No default <INTEGER > 0>
`SPDUNIT`	RPM Specifies that the entries `SPDLOW`, `SPDHIGH` and `SPEED` are input in Revolutions Per Minute. FREQ Specifies that the entries `SPDLOW`, `SPDHIGH` and `SPEED` are input in revolutions per unit time. No default
`SPDLOW`	Minimum rotor speed for synchronous analysis. Default = 0.0 <Real>
`SPDHIGH`	Maximum rotor speed for synchronous analysis. Default = 99999.0 <Real>
`SPEED`	<INTEGER> If an integer value is input, it references a RSPEED Bulk Data Entry that specifies a set of reference rotor speeds for asynchronous analysis. 2 <Real>Default = 0.0 If a real number is input, the value is considered constant and a single reference rotor speed value is specified. 2 Default = 0 <INTEGER, Real>

Comments

Multiple RGYRO Bulk Data Entries with the same RID cannot exist.

The values entered on some optional fields of the RGYRO Bulk Data Entry depend on factors such as: solution sequence used, type of analysis performed, and the value of specific parameters. The following table shows some of the optional fields and their relevance based on the listed factors. Synchronous analysis is performed when the rotor speed is equal to the modal frequency (Complex Eigenvalue Analysis) or the frequency of the forcing function (Frequency Response Analysis) and Asynchronous analysis is performed when the user-specified rotor speed is used for the analysis.

Solution Sequence	Synchronous/Asynchronous Analysis	Required Entry	PARAM, `GYROAVG`	Comment
Modal Frequency Response Analysis	Synchronous	None	0	-
	Synchronous	`SPDLOW`, `SPDHIGH`	-1	3, 4
	Asynchronous	`SPEED`	0	-
	Asynchronous	`SPEED`	-1	4
Modal Complex Eigenvalue Analysis	Synchronous	`SPDLOW`, `SPDHIGH`	-	3, 4
Modal Complex Eigenvalue Analysis	Asynchronous	`SPEED`	-	4

When multiple rotors are present within the system being modeled, one of the rotors is chosen as a reference rotor. The speeds of the rest of the rotors are linearly dependent of the reference rotor. Scale factors S1 and S2 are used to relate the speeds.(1)
$Ω = S 1 + S 2 * Ω_{ref}$

Where,

Ω

Speed of a rotor (different from the reference rotor)

S1 and S2

Scale factors

Ω_ref

Speed of the reference rotor

The scale factors S1 and S2 will be calculated by a least-mean-square fit of the relative rotor speeds specified on the RSPINR entries (between SPDLOW to SPDHIGH of the reference rotor). If the SPDLOW or SPDHIGH values are beyond the range specified on the RSPINR entry, the values will be extrapolated from the RSPINR entry values.
PARAM, WR3 and PARAM, WR4 are necessary for rotor damping.