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公开(公告)号：US11567459B2
公开(公告)日：2023-01-31
申请号：US16580463
申请日：2019-09-24
Applicant: ROLLS-ROYCE plc
Inventor： Derek S Wall , Chana T Goldberg , Panagiotis Laskaridis , Devaiah K Nalianda
Abstract: A method of optimizing the operation of a fleet of gas turbine engines is provided. The method comprises the steps of: (a) measuring respective values for plural control actuator settings within each of the gas turbine engines; (b) deriving, based on data external to the operation of the gas turbine engines, a desired performance modification of the gas turbine engines; (c) determining, based on the measured control actuator settings, one or more respective trim signals for varying selected of the control actuator settings to achieve the desired performance modification; and (d) transmitting the trim signals to respective electronic controllers of the engines to vary the selected control actuator settings accordingly.
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公开(公告)号：US11561235B2
公开(公告)日：2023-01-24
申请号：US16690650
申请日：2019-11-21
Applicant: ROLLS-ROYCE PLC
Inventor： Robert N Shepherd , Kevin E Gapper
Abstract: A system for monitoring the axial position of a rotating shaft includes a phonic wheel mounted coaxially to the shaft for rotation with a circumferential row of teeth. The system includes a sensor configured to detect the passage of the teeth by generating an alternating measurement signal. First and second portions of the teeth alternate around the row and contribute respective first and second components to the alternating measurement signal. The first portion of teeth vary in height in an axial direction of the wheel such that the relative height of the first and second portions varies with axial distance across the phonic wheel, and the sensor is positioned relative to the phonic wheel such that axial displacement of the shaft causes the signal to vary the first component's amplitude relative to the second component's amplitude due to the height variation, to monitor the axial position of the shaft.
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公开(公告)号：US20230018916A1
公开(公告)日：2023-01-19
申请号：US17811740
申请日：2022-07-11
Applicant: ROLLS-ROYCE plc
Inventor： David R. TRAINER , Ellis F H CHONG , Jonathan M. STEVENS
Abstract: An AC to DC conversion device has first and second AC input terminals arranged to be coupled respectively to first and second terminals of a phase of an AC current generator, an H-bridge rectification device comprising two pairs of diodes, each pair being coupled to a respective one of the AC terminals to produce a DC output comprising a rectified back EMF waveform, and a waveform generator. The waveform generator comprises an output coupled to the DC output of the H-bridge rectification device, and is configured to input a unidirectional waveform to the DC output having the same magnitude and fundamental frequency as the rectified back EMF, phase shifted by a predetermined angle relative to the rectified back EMF waveform.
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公开(公告)号：US20230015929A1
公开(公告)日：2023-01-19
申请号：US17856575
申请日：2022-07-01
Applicant: ROLLS-ROYCE PLC , ROLLS-ROYCE DEUTSCHLAND LTD & CO KG
Inventor： Michael R SMITH , Imon-Kalyan BAGCHI
IPC: F23R3/28
Abstract: A lean burn fuel spray nozzle comprises: a lean burn fuel spray nozzle head comprising a pilot fuel injector with a pilot fuel injector outlet and a main fuel injector with a main fuel injector outlet; a feed arm adapted to feed pilot fuel from pilots pipework to the pilot fuel injector through a pilot fuel circuit and feed main fuel from mains pipework to the main fuel injector through a main fuel circuit; and a switching device comprising a switching valve adapted to switch between a Main On position, wherein the main fuel injector is in fluid communication with the mains pipework such that main fuel is sprayed through the main fuel injector outlet, and a Main Off position, wherein the main fuel injector outlet is not in fluid communication with the mains pipework such that main fuel is prevented to flow through the main fuel injector.
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公开(公告)号：US11555248B2
公开(公告)日：2023-01-17
申请号：US17125270
申请日：2020-12-17
Applicant: ROLLS-ROYCE plc
Inventor： Feng Li , Iulian Marinescu , Adrian W Y Tan , Sun Wen , Erjia Liu
Abstract: A method comprising: cold-spraying a surface of a substrate with a bond material to form a bond coating; and cold-spraying a surface of the bond coating with a coating material to form a top coating. The bond material is different from the coating material and harder than the surface of the substrate.
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Patent Agency Ranking
公开(公告)号：US11549687B2
公开(公告)日：2023-01-10
申请号：US16916589
申请日：2020-06-30
Applicant: ROLLS-ROYCE plc
Inventor： Michael Griffiths , Daniel J. Bickley
Abstract: A combustion staging system for fuel injectors of a multi-stage combustor of a gas turbine engine. The system includes plural fuel injectors, each having respective pilot and mains injection stages. It further includes a splitting unit which, to perform staging control of the combustor, receives a metered fuel flow and, for pilot and mains operation, controllably splits the received fuel flow into a pilot flow for injecting at the pilot stages of the injectors and a mains flow for injecting at the mains stages of the injectors, and for pilot-only operation, controllably splits the received fuel flow into a first part of the pilot flow for injecting at the pilot stages of a first portion of the injectors and a second part of the pilot flow for injecting at the pilot stages of a second portion of the injectors.
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公开(公告)号：US11549438B2
公开(公告)日：2023-01-10
申请号：US17494523
申请日：2021-10-05
Applicant: ROLLS-ROYCE plc
Inventor： Stephen J Bradbrook , Martin N Goodhand , Paul M Hield , Andrew Parsley , Natalie C Wong , Robert J Corin , Thomas S Binnington
Abstract: A turbofan gas turbine engine includes heat exchanger module, fan assembly, compressor, turbine and exhaust modules. The fan includes a plurality of fan blades. The heat exchanger in fluid communicates with the fan assembly by an inlet duct, and the heat exchanger includes a plurality of radially-extending hollow vanes arranged in a circumferential array, with a channel extending axially between each pair of adjacent hollow vanes. An airflow entering the heat exchanger is divided between a set of vane airflows and a set of channel airflows. Each vane airflow has a vane mass flow rate FlowVane, and each channel air flow has a channel mass flow rate FlowChan. Each hollow vane includes, an inlet, heat transfer, and exhaust portions, with the inlet portion comprising a diffuser element and the heat transfer portion including at least one heat transfer element. The diffuser element causes FlowVane to be lower than FlowChan.
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公开(公告)号：US11542873B2
公开(公告)日：2023-01-03
申请号：US17827214
申请日：2022-05-27
Applicant: ROLLS-ROYCE plc
Inventor： Mark Spruce
Abstract: Gearboxes for aircraft gas turbine engines, in particular arrangements for journal bearings such gearboxes, and related methods of operating such gearboxes and gas turbine engines. A gearbox for an aircraft gas turbine engine includes: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.
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公开(公告)号：US11542021B2
公开(公告)日：2023-01-03
申请号：US17197708
申请日：2021-03-10
Applicant: ROLLS-ROYCE PLC
Inventor： Richard Harwood , Kalyani G. Menon , Joseph Palmer , Ivan Popovic
IPC: H02P23/14 , H02P5/74 , B64D27/24 , B63H21/20 , B61C5/00 , B63H21/17 , B64D27/02 , H02J7/34 , H02J3/02 , H02J50/10 , H02J3/00 , H02J3/46 , B64D27/10
Abstract: An aircraft propulsion system includes at least first and second electrical generators, each being configured to provide electrical power to a respective first and second AC electrical network. The system further comprises at least first and second AC electrical motors directly electrically coupled to a respective AC network and coupled to a respective propulsor, and a DC electrical network electrically coupled to the first and second AC networks via respective first and second AC to DC converters, and to a further electrical motor, the further electrical motor being coupled to a propulsor.
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公开(公告)号：US20220411954A1
公开(公告)日：2022-12-29
申请号：US17842447
申请日：2022-06-16
Applicant: ROLLS-ROYCE plc
Inventor： Daniel CLARK
Abstract: A method of electropolishing an internal passageway of a component, wherein the passageway has an inlet and an outlet; including: providing an electrode assembly including a flexible electrode, a shuttle and a guide cable extending between the flexible electrode and the shuttle; inserting the shuttle into the inlet; causing fluid to flow through the passageway to transport the shuttle through the passageway from the inlet towards the outlet; pulling the guide cable through the passageway to position the electrode in the passageway adjacent to a region of the passageway to be polished; and electropolishing the passageway using the electrode while moving the electrode within the passageway. Also, an electrode assembly for electropolishing an internal passageway of a component, including: a flexible electrode, a shuttle, and a guide cable extending between the flexible electrode and the shuttle.
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