CN106628099A - Tethered and autonomous flight dual-purpose solar aerostat - Google Patents

Tethered and autonomous flight dual-purpose solar aerostat Download PDF

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Publication number
CN106628099A
CN106628099A CN201611099874.2A CN201611099874A CN106628099A CN 106628099 A CN106628099 A CN 106628099A CN 201611099874 A CN201611099874 A CN 201611099874A CN 106628099 A CN106628099 A CN 106628099A
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CN
China
Prior art keywords
aerostatics
tethered
air bag
gasbag
dual
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611099874.2A
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Chinese (zh)
Inventor
龙飞
王根辉
张常东
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China Special Vehicle Research Institute
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China Special Vehicle Research Institute
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Priority to CN201611099874.2A priority Critical patent/CN106628099A/en
Publication of CN106628099A publication Critical patent/CN106628099A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64BLIGHTER-THAN AIR AIRCRAFT
    • B64B1/00Lighter-than-air aircraft
    • B64B1/06Rigid airships; Semi-rigid airships
    • B64B1/20Rigid airships; Semi-rigid airships provided with wings or stabilising surfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64BLIGHTER-THAN AIR AIRCRAFT
    • B64B1/00Lighter-than-air aircraft
    • B64B1/06Rigid airships; Semi-rigid airships
    • B64B1/22Arrangement of cabins or gondolas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64BLIGHTER-THAN AIR AIRCRAFT
    • B64B1/00Lighter-than-air aircraft
    • B64B1/06Rigid airships; Semi-rigid airships
    • B64B1/24Arrangement of propulsion plant
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64BLIGHTER-THAN AIR AIRCRAFT
    • B64B1/00Lighter-than-air aircraft
    • B64B1/06Rigid airships; Semi-rigid airships
    • B64B1/24Arrangement of propulsion plant
    • B64B1/26Arrangement of propulsion plant housed in ducts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64BLIGHTER-THAN AIR AIRCRAFT
    • B64B1/00Lighter-than-air aircraft
    • B64B1/40Balloons
    • B64B1/50Captive balloons
    • B64B1/52Captive balloons attaching trailing entanglements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64BLIGHTER-THAN AIR AIRCRAFT
    • B64B1/00Lighter-than-air aircraft
    • B64B1/58Arrangements or construction of gas-bags; Filling arrangements
    • B64B1/62Controlling gas pressure, heating, cooling, or discharging gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64DEQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D27/00Arrangement or mounting of power plant in aircraft; Aircraft characterised thereby
    • B64D27/02Aircraft characterised by the type or position of power plant
    • B64D27/24Aircraft characterised by the type or position of power plant using steam, electricity, or spring force
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00Aeronautics or air transport
    • Y02T50/60Efficient propulsion technologies, e.g. for aircraft

Abstract

The invention provides a tethered and autonomous flight dual-purpose solar aerostat. The tethered and autonomous flight dual-purpose solar aerostat comprises a gasbag and an auxiliary gasbag. The gasbag is filled with levitation gas. The auxiliary gasbag located on the lower middle portion of the gasbag is used for being inflated and deflated. A film type solar cell is pasted on the upper surface of the gasbag in a covering mode. An X-shaped empennage with a control plane is arranged on the rear portion of the gasbag. Electric duct steering propellers are arranged on the two sides of the middle of the gasbag correspondingly. An electric propeller is arranged at the tail of the gasbag. An undercarriage is arranged on the lower middle portion of the gasbag. The tethered and autonomous flight dual-purpose solar aerostat mainly combines the advantages of a traditional airship and a tethered balloon, thus the single aerostat can fly autonomously and can also achieve fixed point tethering, and meanwhile the solar cell and an energy storage cell are used for supplying electricity and providing flight power for shipboard equipment. Compared with the traditional airship, the dual-purpose solar aerostat has the advantages of being longer in endurance time, environmentally friendly, capable of saving energy and the like. Compared with a conventional tethered balloon, the dual-purpose solar aerostat has the advantages of being high in maneuverability, good in economic property, large in task execution area and the like.

Description

One kind is tethered at and autonomous flight dual-purpose solar aerostatics
Technical field
The invention belongs to aircraft field, and in particular to one kind both can be tethered at, and the solar buoy of autonomous flight can be carried out again Empty aircraft.
Background technology
Aerostatics is the light gas that a kind of internal filling is lighter than air, relies primarily on the boat that the quiet buoyancy of air realizes lift-off Pocket.Dirigible and captive balloon are also part important in aerostatics pedigree.
Captive balloon is that one kind is stably tethered in captive balloon with one by tether cable and ground anchoring device Determine the locus of height above sea level, and carry task device, ground and aerial target are performed it is prolonged scout, it is monitoring, pre- The alert, system platform of communication task, belongs to unpowered aerostatics.Different from captive balloon, dirigible is that one kind utilizes Powered Propulsion System, ship carry function system and flight control system etc., and the drive for realizing lift-off, decline, hovering or maneuvering flight is floated Pocket.By its difference of height of going up to the air, dirigible can be divided into troposphere dirigible and stratospheric airship.
Conventional convection layer dirigible generally adopts aero-engine, due to the restriction of entrained fuel oil, it is impossible to when carrying out growing boat Flight, therefore the fixed point for equally carrying out long-time (as more than a couple of days) without image of Buddha captive balloon is tethered at work.And captive balloon Denier is set up after lift-off, can only be pinpointed and is tethered at work, and its working region is limited by mission payload and lift-off height, if working region Beyond the working range of its captive or when needing the short time to be worked at a distance, then need to reclaim captive balloon, and by Ground transport is reinflated to carry out being tethered at work to working region, it is impossible to which autonomous flight performs task as dirigible.In addition, by Need autonomous flight in the air in dirigible, therefore dirigible is as aircraft, its profile need to be designed to it is streamlined, to ensure that dirigible has There is less resistance.And captive balloon only needs fixed point to be tethered at work, aerodynamic stability will get well, not high to spheroid resistance, because This, in captive balloon configuration design, general balloon head design is all more blunt.
There is presently no and traditional dirigible and captive balloon combine, realize single aerostatics can autonomous flight, and energy The aerostatics that fixed point is tethered at is disclosed.
The content of the invention
The purpose of the present invention is the advantage and handling characteristics with reference to traditional dirigible and conventional captive balloon, there is provided one kind can Fixed point is tethered at, and certain distance and the autonomous flight of time, the solar buoy pocket of energy-conserving and environment-protective can be carried out again.
The technical scheme is that:
Described one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:Including air bag and balloonet;Gas Intracapsular filling buoyance lift gas, in the underbelly balloonet of air bag charge and discharge air is used for;
Air bag upper surface posts membrane type solar cell;Air bag rear portion is provided with " X " type tail with rudder face;Air bag middle part two Side is respectively arranged electronic duct and turns to propeller, air bag afterbody arrangement electric plating propulsion;Air bag lower abdomen is provided with undercarriage;Floating Pocket bottom is provided with task gondola, task gondola places load and energy-storage battery, the energy-storage battery and solar battery group Into aerostatics power supply source;
Aerostatics head is provided with nose cone, and bottom is provided with rotary connector;When aerostatics is tethered in the air, aerostatics passes through Rotary connector connects tether cable, and tether cable is connected with Ground Mooring car;When the mooring of aerostatics ground, connected by rotating Connecing device makes aerostatics be connected with tether cable and be tethered on mooring car, and by the air cushion on mooring car aerostatics is supported, and leads to Cross the nose cone that nose cone lock pins aerostatics head.
Further preferred version, described one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:Gas Capsule is spindle structural balloon.
Further preferred version, described one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:Gas Capsule afterbody electric plating propulsion provides power for aerostatics cruise;Taking off, windy conditions or when declining, the electricity of air bag middle part both sides Dynamic duct turns to propeller and air bag afterbody electric plating propulsion provides power for aerostatics simultaneously.
Further preferred version, described one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:When When aerostatics is tethered in the air, if solar cell for supplying power is not enough, powered to equipment on aerostatics by tether cable.
Further preferred version, described one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:When When aerostatics is tethered in the air, can be by propeller on aerostatics and rudder face auxiliary gesture stability.
Further preferred version, described one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:When When aerostatics carries out autonomous flight, first aerostatics is recovered to into certain altitude, a certain amount of air is filled with into balloonet side by side A certain amount of buoyance lift gas in air bag is released, makes aerostatics in net weight state, start the afterbody electric plating propulsion on aerostatics Propeller is turned to electronic duct, and controls rotary connector unblock, aerostatics is separated with tether cable, aerostatics is in Liang Tai Electronic duct turns to VTOL under angle of rake impetus, and turns to propulsion by afterbody electric plating propulsion and electronic duct Device and rudder face effect rise to prearranged altitude flight.
Beneficial effect
The present invention's is tethered at/autonomous flight dual-purpose solar aerostatics, autonomous flight can be carried out on daytime, by solar energy Battery can provide prolonged operation flight.
With 200m3As a example by aerostatics, it is assumed that its max level speed 70km/h, by calculating, power demand is 11.5kW. This programme is the motor of 5kW and the motor of a 1.5kW from 2 power.The motor of 1.5kW is pushed away as afterbody is electronic Enter device and provide aerostatics with the power during speed cruise of 35km/h, 2 power are turned to for the motor of 5kW as electronic duct Propeller, for taking off in aerostatics, wind resistance and decline when, provide power jointly with afterbody electric plating propulsion.
62 square metres of solar panel is arranged on aerostatics, it is bent by calculating the solar energy generated energy of a day Line chart is shown in Fig. 2, Fig. 3.From data in figure, at winter, the morning 8 in one day:30 to afternoon 15:During 30, solar-electricity The generated energy in pond meets the consumption of 1.5kW power electric motors;At summer, the morning 7 in one day:00 to afternoon 17:During 00 too The generated energy of positive energy battery meets the consumption of 1.5kW power electric motors.And can be charged for energy-storage battery.Simultaneously in aerostatics 1 piece of 24V of upper outfit, 200Ah energy-storage batteries.
From data above, in the winter time so that during the speed flight of 35km/h, 6h can be no less than with follow-on mission;In summer When so that during the speed flight of 35km/h, 9h can be no less than with follow-on mission, compare traditional dirigible cruising time improve 50%~ 125%, voyage improves 75%~160%.
In cloudy day, evening and during without the need for maneuvering flight, aerostatics fixed point can be tethered at and carry on work, by floating Solar cell and energy-storage battery are powered for the operation of equipment and motor on aerostatics on pocket, if solar cell and energy storage The delivery of battery can not be met when consuming on aerostatics, can pass through operation of the tether cable to equipment on aerostatics and motor Power supply, compares captive balloon, and working range is bigger.
The additional aspect and advantage of the present invention will be set forth in part in the description, and partly will become from the following description Obtain substantially, or recognized by the practice of the present invention.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from the description with reference to accompanying drawings below to embodiment It is substantially and easy to understand, wherein:
Fig. 1 is ground anchoring view of the present invention;
Fig. 2 is winter solstice generated power of solar cell and single motor power demand curves figure;
Fig. 3 is summer solstice generated power of solar cell and single motor power demand curves figure;
Fig. 4 is aerial captive schematic diagram of the invention;
Fig. 5 is autonomous flight view of the present invention.
Wherein:1st, air bag;2nd, solar cell;3rd, empennage;4th, electronic duct turns to propeller;5th, electric plating propulsion;6、 Balloonet;7th, undercarriage;8th, task gondola;9th, nose cone;10th, rotary connector;11st, tether cable;12nd, mooring car;13rd, gas Pad;14th, nose cone lock;15th, revolving dial.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
In describing the invention, it is to be understood that term " " center ", " longitudinal direction ", " horizontal ", " length ", " width ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outward ", " up time The orientation or position relationship of the instruction such as pin ", " counterclockwise " is, based on orientation shown in the drawings or position relationship, to be for only for ease of The description present invention and simplified description, rather than indicate or imply that the device or element of indication must have specific orientation, Yi Te Fixed azimuth configuration and operation, therefore be not considered as limiting the invention.
As shown in figure 1, one kind proposed by the present invention is tethered at and autonomous flight dual-purpose solar aerostatics, including helium can be filled with The air bag 1 of gas, the solar cell layer being spliced to form by polylith membrane type solar cell 2 is posted in the upper surface of air bag 1.Floating Device, as power and drive control, at the rear portion of air bag 1 band rudder face is provided with using DC Brushless Motor and motor drive controller Empennage 3, empennage 3 be " X " type.The middle part both sides of air bag 1 are respectively arranged an electronic duct and turn to propeller 4 in the present embodiment, And arrange an electric plating propulsion 5 in afterbody.Angle of rake quantity and relative installation can be according to the size of aerostatics and cloth The change of office is adjusted.Balloonet 6 is provided with inside aerostatics lower abdomen, for charge and discharge air, the change of balance weight buoyancy. Undercarriage 7 is provided with aerostatics lower abdomen, for dirigible pattern landing.Task gondola 8, task gondola are provided with aerostatics bottom Interior to lay load and energy-storage battery, solar cell and energy-storage battery provide power supply for aerostatics jointly.In aerostatics head Nose cone 9 is provided with, for aerostatics ground anchoring.
Such as Fig. 1, when the mooring of aerostatics ground, make aerostatics be connected with tether cable 11 by rotary connector 10 to be Stay on mooring car 12, aerostatics is supported by the air cushion 13 on mooring car 12, aerostatics head is pinned by nose cone lock 14 Nose cone 9, makes aerostatics be fixed on mooring car.Simultaneously aerostatics can be turned round in strong wind weather with revolving dial 15.
Such as Fig. 4, when aerostat mooring, air bag 1 makes aerostatics rise shape in net full of the gas helium for being lighter than air State, and aerostatics linked together by rotary connector 10 with tether cable 11, and tether cable 1 connects with Ground Mooring car 12 Connect.Daytime typically provides the energy by solar cell 2 for equipment on aerostatics, and night or solar cell 2 and energy-storage battery supply The energy is provided to equipment on aerostatics and propeller 4 and 5 by tether cable 11 when electric not enough, because aerostatics is spindle knot Structure, is unfavorable for that attitude when being tethered at keeps, therefore the rudder face that need to pass through on aerostatics on propeller and empennage 3 aids in aerostatics Gesture stability.
Such as Fig. 5, when aerostatics maneuvering flight, if aerostatics is in captive, first aerostatics is recovered to necessarily Highly, it is filled with a certain amount of air into balloonet 6 and gives off the helium in air bag 1, make aerostatics in net weight state, rises Three electric plating propulsions 4 and 5 on dynamic aerostatics, and manually control rotary connector 10 is unlocked, and is made aerostatics and is tethered at Hawser 11 is separated, and aerostatics carries out climbing flight in the presence of the rudder face on three electric plating propulsions and empennage 3;In order to improve The cruising time of aerostatics and flying distance, when aerostatics cruising flight, the electronic duct steering for closing down aerostatics both sides is pushed away Enter device 4, using aerostatics afterbody electric plating propulsion 5 cruising flight is carried out.When aerostatics lands, the electricity of aerostatics both sides is started Dynamic duct turns to propeller 4, makes three propellers work simultaneously, and by the underbelly landing of undercarriage 7 ground of aerostatics.
When being tethered in the air again after aerostatics maneuvering flight landing, the air in balloonet 6 is emptied, and into air bag 1 Certain helium is filled with, makes aerostatics be in net liter state;Aerostatics is connected by rotary connector 10 with tether cable 11, Discharge hawser rises to aerostatics and is tethered at height.Floating is aided in by propeller on aerostatics 4 and 5 and the rudder face on empennage 3 The gesture stability of device.
One kind proposed by the present invention is tethered at and autonomous flight dual-purpose solar aerostatics, mainly in combination with traditional dirigible and being tethered at The advantage of balloon, realize single aerostatics can autonomous flight, and can pinpoint and be tethered at, while using solar cell and energy storage electricity Pond is that ship carries equipment and powers and provide flying power, and compared with traditional dirigible, the dual-purpose solar aerostatics has cruising time The advantages of longer and environmental protection and energy saving, compared with conventional captive balloon, the dual-purpose solar aerostatics has mobility strong, economy It is good, and perform mission area it is big the advantages of.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art is in the principle and objective without departing from the present invention In the case of above-described embodiment can be changed within the scope of the invention, change, replace and modification.

Claims (6)

1. one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:Including air bag and balloonet;Fill out in air bag Buoyance lift gas is filled, in the underbelly balloonet of air bag charge and discharge air is used for;
Air bag upper surface posts membrane type solar cell;Air bag rear portion is provided with " X " type tail with rudder face;Air bag middle part both sides point Do not arrange that electronic duct turns to propeller, air bag afterbody arrangement electric plating propulsion;Air bag lower abdomen is provided with undercarriage;In aerostatics Bottom is provided with task gondola, task gondola places load and energy-storage battery, and the energy-storage battery is floating with solar cell composition Pocket power supply source;
Aerostatics head is provided with nose cone, and bottom is provided with rotary connector;When aerostatics is tethered in the air, aerostatics is by rotation Connector connects tether cable, and tether cable is connected with Ground Mooring car;When the mooring of aerostatics ground, by rotary connector Aerostatics is connected with tether cable and is tethered on mooring car, aerostatics is supported by the air cushion on mooring car, by head Cone lock pins the nose cone of aerostatics head.
2. according to claim 1 one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:Air bag is spinning Hammer body structure air bag.
3. one kind according to claim 1 or claim 2 is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:Air bag Afterbody electric plating propulsion provides power for aerostatics cruise;Taking off, windy conditions or when declining, air bag middle part both sides it is electronic Duct turns to propeller and air bag afterbody electric plating propulsion provides power for aerostatics simultaneously.
4. according to claim 1 one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:Work as aerostatics When being tethered in the air, if solar cell for supplying power is not enough, powered to equipment on aerostatics by tether cable.
5. according to claim 2 one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:Work as aerostatics When being tethered in the air, can be by propeller on aerostatics and rudder face auxiliary gesture stability.
6. according to claim 3 one kind is tethered at and autonomous flight dual-purpose solar aerostatics, it is characterised in that:Work as aerostatics When carrying out autonomous flight, first aerostatics is recovered to into certain altitude, a certain amount of air is filled with into balloonet and gas is given off A certain amount of buoyance lift gas in capsule, makes aerostatics in net weight state, starts afterbody electric plating propulsion on aerostatics and electronic Duct turns to propeller, and controls rotary connector unblock, aerostatics is separated with tether cable, and aerostatics is in two electronic culverts Road turns to VTOL under angle of rake impetus, and by afterbody electric plating propulsion and electronic duct turn to propeller and Rudder face effect rises to prearranged altitude flight.
CN201611099874.2A 2016-12-05 2016-12-05 Tethered and autonomous flight dual-purpose solar aerostat Pending CN106628099A (en)

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CN108045585A (en) * 2017-11-21 2018-05-18 中国电子科技集团公司第四十八研究所 The unmanned plane that can remotely charge supplies electric installation, UAV system and control method
CN108248812A (en) * 2018-03-03 2018-07-06 丹阳昊天飞行器技术有限公司 A kind of high intensity nose cone attachment device of captive balloon
CN108944303A (en) * 2018-06-05 2018-12-07 吉林大学 A kind of beetle type three is dwelt bionical mobile robot
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CN112173060A (en) * 2020-11-02 2021-01-05 北京航空航天大学 Stratospheric airship with pressure maintaining device
CN112644681A (en) * 2020-12-30 2021-04-13 中国特种飞行器研究所 Offshore aerostat
CN114340047A (en) * 2021-11-22 2022-04-12 福建省邮电规划设计院有限公司 Balloon mooring type emergency communication 5G base station with adjustable angle

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107416172A (en) * 2017-07-28 2017-12-01 江西理工大学 A kind of full visual angle monitoring and method based on intelligent aerostatics platform
CN108045585A (en) * 2017-11-21 2018-05-18 中国电子科技集团公司第四十八研究所 The unmanned plane that can remotely charge supplies electric installation, UAV system and control method
CN108248812A (en) * 2018-03-03 2018-07-06 丹阳昊天飞行器技术有限公司 A kind of high intensity nose cone attachment device of captive balloon
CN108944303A (en) * 2018-06-05 2018-12-07 吉林大学 A kind of beetle type three is dwelt bionical mobile robot
CN108944303B (en) * 2018-06-05 2022-01-25 吉林大学 Beetle type triphibian bionic mobile robot
CN110015396A (en) * 2019-04-08 2019-07-16 上海交通大学 A kind of large scale semirigid structure dirigible
GB2582963A (en) * 2019-04-11 2020-10-14 Bae Systems Plc Method of flying an aircraft
CN112173060A (en) * 2020-11-02 2021-01-05 北京航空航天大学 Stratospheric airship with pressure maintaining device
CN112644681A (en) * 2020-12-30 2021-04-13 中国特种飞行器研究所 Offshore aerostat
CN114340047A (en) * 2021-11-22 2022-04-12 福建省邮电规划设计院有限公司 Balloon mooring type emergency communication 5G base station with adjustable angle
CN114340047B (en) * 2021-11-22 2023-05-19 福建省邮电规划设计院有限公司 Balloon tethered emergency communication 5G base station with adjustable angle

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Application publication date: 20170510