公开(公告)号：US20240270398A1

公开(公告)日：2024-08-15

申请号：US18441405

申请日：2024-02-14

Applicant: PRATT & WHITNEY CANADA CORP.

Inventor： Mert CEVIK ,  James Robert JARVO ,  Keith MORGAN ,  Elizabeth GIOIA

IPC: B64D31/18 ,  B64D27/33

CPC classification number: B64D31/18 ,  B64D27/33

Abstract: A method of operating a hybrid engine for an aircraft, the hybrid engine having a thermal engine and an electric motor. The method includes verifying, using an engine control unit of the hybrid engine, that a selected power level is under a predetermined threshold for operation of the hybrid engine in a sub-idle hybrid mode. The method further includes operating the hybrid engine in the sub-idle hybrid mode, using the engine control unit, by controlling the thermal engine to operate in a standby mode, and by controlling the electric motor to operate in an active mode wherein the electric motor provides a majority of a propulsive power to the aircraft, wherein in the standby mode the thermal engine operates in a sub-idle condition to provide at most minimal propulsive power to the aircraft.

公开(公告)号：US20220275831A1

公开(公告)日：2022-09-01

申请号：US17188249

申请日：2021-03-01

Applicant: PRATT & WHITNEY CANADA CORP.

Inventor： Mert CEVIK ,  Philip A. VARNEY ,  Robert J. MORRIS ,  David BEAMISH

IPC: F16C27/04 ,  F01D25/16 ,  F16F15/023

Abstract: A dual-film damper has a housing defining an annular damper fluidly connected to a source of pressurized oil. First and second damper rings are coaxially nested within the damper cavity. A first set of spacers allows for the formation of a first oil film annulus between the first and second damper rings. A second set of spacers allows for the formation of a second oil film annulus between the second damper ring and the housing. The first and second oil film annuli have a thickness-to-length ratio (T/L) selected to provide a desired damping capacity.