# US 2019/0379101 A1 · Radome membrane bladder and systems and methods thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0379101 A1 - Document ID: US20190379101A1 - Status: Published application - Kind: A1 - Application number: 16/002,621 - Filed: 2018-06-07 - Published: 2019-12-12 - Earliest claimed: 2018-06-07 - Assignees: Lockheed Martin Corporation - Applicants: Lockheed Martin Corporation - Inventors: Robert M. REESE - Web page: https://patentgrep.com/patent/US20190379101A1 ## CPC - H01Q 1/02: Arrangements for de-icing; Arrangements for drying-out {; Arrangements for cooling; Arrangements for preventing corrosion} - G05D 23/00: Control of temperature - H01Q 1/427: {Flexible radomes} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES ## Abstract A radome membrane bladder and systems and methods thereof can comprise an inner membrane having an inner surface and an outer surface opposite the inner surface, an outer membrane having an inner surface facing the inner membrane and an outer surface facing away from the inner membrane, and at least one port configured to control the supply of air provided between the inner membrane and the outer membrane. At least the outer membrane is movable between a state where no air is provided between the inner membrane and the outer membrane and an outward state when air is being provided or has been provided between the inner membrane and the outer membrane. Movement of the outer membrane can prevent, minimize, and/or remove ice or snow or other foreign material buildup on the outer surface of the radome (i.e., the outer surface of the outer membrane). ## Claims ### Claim 1 An ice inhibiting radome system, comprising: an air supply configured to provide an oscillating flow of air at a predetermined flow rate over a plurality of pressurization/depressurization oscillation cycles; a radome bladder fluidly connected to the air supply to receive the oscillating flow of air, the radome bladder having: an inner stretched membrane, an outer stretched membrane, the outer stretched membrane having an inner surface and an outer surface, the outer surface being smooth, at least one air inlet port configured to receive the oscillating flow of air and provide the oscillating flow of air to a variable volume chamber defined between the inner stretched membrane and the outer stretched membrane, and at least one air outlet port configured to output air from the variable volume chamber defined between the inner stretched membrane and the outer stretched membrane, wherein a peripheral portion of the inner stretched membrane is fixed to a peripheral portion of the outer stretched membrane to create an air-tight seal; a mechanical tensioning assembly coupled to the radome bladder and configured to provide adjustable tensioning of the inner stretched membrane and the outer stretched membrane; and control circuitry configured to control the air supply to controllably provide the oscillating flow of air at the predetermined flow rate to the variable volume chamber defined between the inner stretched membrane and the outer stretched membrane, via the at least one air input port, such that, for each said pressurization/depressurization oscillation cycle, the air causes adjacent portions of the inner stretched membrane and the outer stretched membrane to move apart and thereby increase the variable volume chamber during a pressurization phase of the oscillation cycle, and controllably output the air, via the at least one air output port, from the variable volume chamber, to cause the adjacent portions of the inner stretched membrane and the outer stretched membrane to move toward each other and thereby decrease the variable volume chamber during a depressurization phase of the oscillation cycle, wherein, during each said pressurization/depressurization oscillation cycle each of the inner stretched membrane and the outer stretched membrane goes from a pre-stressed state to an increased-stress state and back to the pre-stressed state. ### Claim 2 (depends on 1) The ice inhibiting radome system of claim 1, wherein the air provided by the air supply is unheated air. ### Claim 3 (depends on 1) The ice inhibiting radome system of claim 1, wherein the air is provided at the predetermined flow rate only during the pressurization phase of the oscillation cycle. ### Claim 4 (depends on 1) The ice inhibiting radome system of claim 1, wherein the predetermined flow rate is between about 1 m3/s to about 20 m3/s. ### Claim 5 (depends on 1) The ice inhibiting radome system of claim 1, wherein the air supply is one of an industrial blower and an air compressor. ### Claim 6 (depends on 1) The ice inhibiting radome system of claim 1, wherein the outer surface of the outer stretched membrane remains at ambient temperature during the plurality of pressurization/depressurization oscillation cycles. ### Claim 7 (depends on 1) The ice inhibiting radome system of claim 1, wherein the outer surface of the outer stretched membrane is coated with polytetrafluoroethylene (PTFE). ### Claim 8 (depends on 1) The ice inhibiting radome system of claim 1, wherein each said pressurization/depressurization oscillation cycle lasts from about three seconds to about three minutes. ### Claim 9 (depends on 1) The ice inhibiting radome system of claim 1, wherein the air supply includes a heater configured to heat air so the air supply provides heated air as the air provided to the radome bladder. ### Claim 10 (depends on 9) The ice inhibiting radome system of claim 9, further comprising one or more icing sensors configured to sense ice buildup and/or impending ice buildup on the outer surface of the outer stretched membrane, wherein the controller is configured to start a first one of said pressurization/depressurization oscillation cycles responsive to a signal from the one or more icing sensors that ice has built up or will imminently build up on the outer surface of the outer stretched membrane. ### Claim 11 A method of removing or preventing ice and/or snow accumulation on a radome using a flexible radome bladder, the method comprising: providing the radome, the radome including: the flexible radome bladder, the flexible radome bladder being fluidly connected to an air supply to receive forced air from the air supply and having: an inner membrane provided in parallel with an outer membrane, the outer membrane having an inner surface that touches an inner surface of the inner membrane, and an outer surface that faces away from the inner membrane, at least one air inlet port configured to receive the forced air from the air supply and provide the forced air between the inner membrane and the outer membrane, and at least one air outlet port configured to output air from between the inner membrane and the outer membrane; determining an ice and/or snow accumulation condition relative to the outer surface of the outer membrane; and controlling, using a processor, a center portion of the outer membrane to move away from a center portion of the inner membrane, responsive to said determining the ice and/or snow accumulation condition, by forcing the air from the air supply between the inner membrane and the outer membrane, wherein said controlling causes the outer membrane to move from a first pre-stressed state to a first increased-stress state. ### Claim 12 (depends on 11) The method of claim 11, further comprising controlling, using the processor, the center portion of the outer membrane to move toward the center portion of the inner membrane, immediately after said controlling the center portion of the outer membrane to move away from the center portion of the inner membrane. ### Claim 13 (depends on 11) The method of claim 11, wherein said controlling includes controlling the center portion of the inner membrane to move away from the center portion of the outer membrane, responsive to said determining the ice and/or snow accumulation condition, by forcing the air from the air supply between the inner membrane and the outer membrane, and wherein said controlling causes the inner membrane to move from a second pre-stressed state to a second increased-stress state. ### Claim 14 (depends on 11) The method of claim 11, further comprising heating the air prior to forcing the air from the air supply between the inner membrane and the outer membrane, the air forced between the inner membrane and the outer membrane being heated air. ### Claim 15 (depends on 11) The method of claim 11, further comprising repeatedly controlling, using the processor, the center portion of the outer membrane to move away from the center portion of the inner membrane by forcing the air from the air supply between the inner membrane and the outer membrane. ### Claim 16 (depends on 15) The method of claim 15, wherein the forced air provided between the inner membrane and the outer membrane pressurizes a chamber of the flexible radome bladder formed between the inner membrane and the outer membrane. ### Claim 17 A flexible radome bladder system comprising: an inner tensioned membrane having an inner surface and an outer surface opposite the inner surface; an outer tensioned membrane provided adjacent to the inner tensioned membrane, the outer tensioned membrane having an inner surface facing the inner tensioned membrane and an outer surface facing away from the inner tensioned membrane; at least one air inlet port configured to provide air between the outer tensioned membrane and the inner tensioned membrane; and at least one air outlet port configured to output the air provided between the outer tensioned membrane and the inner tensioned membrane, wherein the inner tensioned membrane and the outer tensioned membrane are affixed to each other to create an air-tight seal around the inner tensioned membrane and the outer tensioned membrane, and wherein the inner tensioned membrane and the outer tensioned membrane are configured such that respective inner portions are movable between a pre-tensioned state where no air is being provided between the inner tensioned membrane and the outer tensioned membrane and a predetermined increased-tension state when air is being or has been provided between the inner tensioned membrane and the outer tensioned membrane. ### Claim 18 (depends on 17) The flexible radome bladder system of claim 17, wherein the inner tensioned membrane and the outer tensioned membrane form a flat planar radome. ### Claim 19 (depends on 17) The flexible radome bladder system of claim 17, wherein the at least one air inlet port and the at least one air outlet port are the same. ### Claim 20 (depends on 17) The flexible radome bladder system of claim 17, further comprising a mechanical tensioning assembly coupled to the inner tensioned membrane and the outer tensioned membrane configured to provide tensioning of the inner tensioned membrane and the outer tensioned membrane at the pre-tensioned state.