# US 10,309,223 B2 · Rotational imbalance reduction > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,223 B2 - Document ID: US10309223B2 - Status: Granted - Kind: B2 - Application number: 15/266,553 - Filed: 2016-09-15 - Published: 2018-03-15 - Granted: 2019-06-04 - Earliest claimed: 2016-09-15 - Assignees: General Electric Company - Applicants: General Electric Company - Inventors: Immanuel Safari Zadeh; James Michael Fogarty; Mateusz Wojciech Golebiowski - Web page: https://patentgrep.com/patent/US10309223B2 ## CPC - F01D 5/027: {Arrangements for balancing (for balancing rotating bodies in general F16F15/32; for compensating imbalance G01M1/36)} - F01D 5/08: Heating, heat-insulating or cooling means {(specially adapted for radial flow machines or engines F01D5/04)} - F01D 5/10: Anti- vibration means {(specially adapted for radial flow machines or engines F01D5/04)} - F01D 5/26: Antivibration means not restricted to blade form or construction or to blade-to-blade connections {or to the use of particular materials} - F01D 17/02: Arrangement of sensing elements - G01M 1/22: and converting vibrations due to imbalance into electric variables - G01M 1/30: Compensating imbalance - G01M 15/14: Testing gas-turbine engines or jet-propulsion engines - H05B 6/102: {the metal pieces being rotated while induction heated} - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract Various embodiments include apparatuses and systems for controlling rotational imbalance of a rotary element. In one embodiment, a rotational imbalance reduction apparatus includes at least one heating element for heating a location on a rotary element, a pulsing element configured to pulse actuate the heating element in synchronization with a multiple, fraction, or mixed fraction of the frequency of rotation of the rotary element, and a control system coupled with the pulsing element and the heating element, the control system actuating the heating element and the pulsing element to apply heat to the location of the rotary element in pulses synchronized with the multiple, fraction, or mixed fraction of the frequency of rotation of the rotary element. ## Claims ### Claim 1 A system comprising: a turbomachine rotor assembly including a rotary element; at least one heating element mounted proximate the rotary element; and a control system coupled with the heating element, the control system: determining whether a rotational imbalance of the turbomachine rotor assembly exceeds a predetermined level; and actuating the at least one heating element to heat the rotary element in response to determining that the rotational imbalance of the turbomachine rotor assembly exceeds the predetermined level; and wherein the at least one heating element comprises a first electrode and a second electrode, the first electrode coupled to a first power source, the second electrode coupled to a second power source; and wherein the first power source is configured to supply high frequency, high voltage electricity relative to electricity supplied by the second power source, and the second power source is configured to supply high current, low voltage electricity relative to electricity supplied by the first power source. ### Claim 2 (depends on 1) The system of claim 1, wherein the rotary element comprises a dopant on a surface location, the dopant increasing a heat response in the surface location upon actuating the heating element, the increasing heat response being relative to a material composing the surface location undoped. ### Claim 3 (depends on 1) The system of claim 1, further comprising a sensor system including at least one sensor to detect vibration amplitude of the rotary element. ### Claim 4 (depends on 1) The system of claim 1, wherein the at least one heating element comprises a light transmitter configured to transmit light onto the rotary element. ### Claim 5 (depends on 1) The system of claim 1, wherein the at least one heating element comprises at least one electrode electrically configured to generate an arc of electricity from the at least one electrode to the rotary element. ### Claim 6 (depends on 1) The system of claim 1, wherein the at least one heating element comprises at least one inductor configured to induce an eddy current in the rotary element. ### Claim 7 A system comprising: a turbomachine rotor assembly including a rotary element; at least one heating element mounted proximate the rotary element, the at least one heating element comprising a plurality of heating elements arranged to form at least a portion of a ring around the rotary element, the plurality of heating elements including a first subset and a second subset of heating elements; a control system coupled with the heating element, the control system: determining whether a rotational imbalance of the turbomachine rotor assembly exceeds a predetermined level; and actuating the at least one heating element to heat the rotary element in response to determining that the rotational imbalance of the turbomachine rotor assembly exceeds the predetermined level; and a pulsing element coupled to the control system and configured to pulse actuate the plurality of heating elements in synchronization with a multiple, fraction, or mixed fraction of a frequency of rotation of the rotary element; wherein the control system activates the first subset of the plurality of heating elements in first pulses synchronized with the multiple, fraction, or mixed fraction of the frequency of rotation of the rotary element, and the control system activates the second subset of the plurality of heating elements in second pulses synchronized with the multiple, fraction, or mixed fraction of the frequency of rotation of the rotary element, the first pulses being temporally offset from the second pulses. ### Claim 8 (depends on 7) The system of claim 7, wherein the rotary element comprises a dopant on a surface location, the dopant increasing a heat response in the surface location upon actuating the heating element, the increasing heat response being relative to a material composing the surface location undoped. ### Claim 9 (depends on 7) The system of claim 7, further comprising a sensor system including at least one sensor to detect vibration amplitude of the rotary element. ### Claim 10 (depends on 7) The system of claim 7, wherein the at least one heating element comprises a light transmitter configured to transmit light onto the rotary element. ### Claim 11 (depends on 7) The system of claim 7, wherein the at least one heating element comprises at least one inductor configured to induce an eddy current in the rotary element.