US 12,215,633 B2
Midshaft rating for turbomachine engines
Narayanan Payyoor, Thrissur (IN); Weize Kang, Mason, OH (US); Thomas Lee Becker, Symmes Township, OH (US); and Richard Schmidt, Loveland, OH (US)
Assigned to GENERAL ELECTRIC COMPANY, Evendale, OH (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Oct. 13, 2023, as Appl. No. 18/486,523.
Application 18/486,523 is a continuation of application No. 18/152,991, filed on Jan. 11, 2023, granted, now 11,795,882.
Application 18/152,991 is a continuation of application No. 17/328,795, filed on May 24, 2021, granted, now 11,603,801, issued on Mar. 14, 2023.
Prior Publication US 2024/0117770 A1, Apr. 11, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F02C 7/36 (2006.01); F02C 7/06 (2006.01)
CPC F02C 7/36 (2013.01) [F02C 7/06 (2013.01); F05D 2240/54 (2013.01); F05D 2240/61 (2013.01); F05D 2250/711 (2013.01); F05D 2300/603 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating a turbomachine engine including a power turbine and a shaft that is coupled to the power turbine, the method comprising:
driving the shaft, wherein the shaft is characterized by a midshaft rating (MSR) between two hundred (ft/sec)1/2 and three hundred (ft/sec)1/2; and
operating the turbomachine engine up to a redline speed without passing through a critical speed associated with a first-order bending mode of the shaft.