CN215622798U - Indoor debugging equipment of multi-rotor unmanned aerial vehicle - Google Patents

Indoor debugging equipment of multi-rotor unmanned aerial vehicle Download PDF

Info

Publication number
CN215622798U
CN215622798U CN202122013294.XU CN202122013294U CN215622798U CN 215622798 U CN215622798 U CN 215622798U CN 202122013294 U CN202122013294 U CN 202122013294U CN 215622798 U CN215622798 U CN 215622798U
Authority
CN
China
Prior art keywords
unmanned aerial
aerial vehicle
debugging
flight
indoor
Prior art date
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.)
Active
Application number
CN202122013294.XU
Other languages
Chinese (zh)
Inventor
王炎
范嘉宇
刘云平
丁明明
张豪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Naikela Intelligent Technology Co ltd
Original Assignee
Nanjing University of Information Science and Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nanjing University of Information Science and Technology filed Critical Nanjing University of Information Science and Technology
Priority to CN202122013294.XU priority Critical patent/CN215622798U/en
Application granted granted Critical
Publication of CN215622798U publication Critical patent/CN215622798U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Toys (AREA)

Abstract

The utility model discloses indoor debugging equipment for a multi-rotor unmanned aerial vehicle, which comprises a debugging fixing mechanism, wherein the debugging fixing mechanism plays a role in offsetting the lift force of the unmanned aerial vehicle to stabilize the debugging equipment; the attitude detection mechanism is positioned right above the debugging and fixing mechanism, is in sliding connection with the debugging and fixing mechanism, and is used for detecting the flight attitude of the unmanned aerial vehicle; the unmanned aerial vehicle flight mechanism is fixedly assembled at the top end of the attitude detection mechanism, provides a basic hardware unit for the unmanned aerial vehicle, and performs test work on the flight controller. In order to solve the problems that when parameters of a multi-rotor unmanned aerial vehicle are adjusted, flight is dangerous, testing is not easy to conduct, aircraft testing is affected by field weather, and the like, the utility model provides indoor debugging equipment for the multi-rotor unmanned aerial vehicle.

Description

Indoor debugging equipment of multi-rotor unmanned aerial vehicle
Technical Field
The utility model relates to the technical field of unmanned aerial vehicles, in particular to indoor debugging equipment for a multi-rotor unmanned aerial vehicle.
Background
An unmanned aerial vehicle, abbreviated as Unmanned Aerial Vehicle (UAV) in English, refers to an autopilot that is controlled wirelessly by a remote controller or an automation program. Along with the progress of science and technology, unmanned aerial vehicles suitable for various scenes emerge day by day, and the level of intellectuality and autonomy of unmanned aerial vehicle is higher and higher. Most unmanned aerial vehicles still adopt traditional PID control, although the control method is stable, the optimal solution is difficult to obtain when the unmanned aerial vehicles leave a factory, the unmanned aerial vehicles are frequently debugged repeatedly according to experience and then test-fly repeatedly, the unmanned aerial vehicles with unstable parameters have certain dangerousness when test-fly, and accidents such as runaway and crash are easy to occur. And receive weather effect great, for example outdoor wind speed often influences unmanned aerial vehicle's barometer, makes it appear extra disturbance, is difficult to accurate reaction unmanned aerial vehicle flight condition, has increased aircraft tester's the work degree of difficulty, has reduced the reliability of debugging.
The device for the multi-polarity unmanned aerial vehicle debugging platform and the multi-polarity unmanned aerial vehicle debugging method, which are disclosed by the patent CN201810376101.7, is formed by parallelly supporting a triangular structure and reacting test data through a mechanical sensor at the top end. However, the flying attitude of the unmanned aerial vehicle cannot be observed, the unmanned aerial vehicle is fixed on the support frame and cannot move, the flying attitude of the unmanned aerial vehicle cannot be intuitively reflected, and the debugging condition of the unmanned aerial vehicle cannot be comprehensively reflected.
Patent CN201921325123.7 discloses "an unmanned aerial vehicle debugs isolated plant", through transversely slide to with the vertical slide reaction unmanned aerial vehicle flight gesture, through pressure sensor reaction test data. This test can be rolled unmanned aerial vehicle's bucket, and every single move data tests, but can't measure unmanned aerial vehicle's driftage, and unmanned aerial vehicle's aircraft nose can only aim at the single direction promptly, so the device has very big test limitation.
Therefore, in order to solve the problems that the flight is dangerous and difficult to test when the parameters of the multi-rotor unmanned aerial vehicle are adjusted, the aircraft test is influenced by the field weather, and the like, the utility model provides the indoor debugging equipment for the multi-rotor unmanned aerial vehicle, the equipment provides basic conditions for the debugging of the multi-rotor unmanned aerial vehicle, and the unmanned aerial vehicle can be directly installed on the equipment for indoor test, so that the test of the takeoff and flight attitude of the unmanned aerial vehicle is completed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide indoor debugging equipment for a multi-rotor unmanned aerial vehicle, which aims to solve the problems in the background technology.
In order to solve the technical problems, the utility model provides the following technical scheme: an indoor debugging of many rotor unmanned aerial vehicle is equipped, includes:
the debugging fixing mechanism plays a role in offsetting the lift force of the unmanned aerial vehicle to stabilize the debugging equipment;
the attitude detection mechanism is positioned right above the debugging and fixing mechanism, is in sliding connection with the debugging and fixing mechanism, and is used for detecting the flight attitude of the unmanned aerial vehicle;
the unmanned aerial vehicle flight mechanism is fixedly assembled at the top end of the attitude detection mechanism, provides a basic hardware unit for the unmanned aerial vehicle, and performs test work on the flight controller.
Further, the debugging fixing mechanism comprises:
a fixed base frame arranged in a vertical direction;
and the support column is fixedly arranged at the central position of the fixed underframe along the vertical direction.
Further, the posture detecting mechanism includes:
the inserted rod is vertically inserted into the free end of the supporting column and is in sliding connection with the supporting column, so that the action of limiting the movement range of the unmanned aerial vehicle in the horizontal direction is achieved;
the supporting plate is transversely arranged above the inserted rod and is connected with the inserted rod through a rotating assembly;
the sliding rod is transversely inserted into the upper end of the inserting rod, and two ends of the sliding rod are respectively in sliding connection with the side wall of the fixed underframe, so that the function of limiting the movement range of the unmanned aerial vehicle in the vertical direction is achieved;
the gyro angle indicator is fixedly assembled on the supporting plate and positioned on one side of the rotating assembly, and is used for observing the flight attitude condition of the unmanned aerial vehicle in a hovering state;
the battery mounting groove, its fixed assembly in on the layer board and with gyro angle appearance homonymy sets up, aims at providing power for unmanned aerial vehicle flight mechanism.
Wherein, rotating assembly and gyro angle appearance mating reaction, unmanned aerial vehicle's debugging error can embody on multi freedom's rotating assembly, and the real-time detection error data of rethread gyro angle appearance.
Further, unmanned aerial vehicle flight mechanism includes:
the machine body is transversely arranged right above the supporting plate and is fixedly connected with the supporting plate through a fixing plate;
the flight control installation box is fixedly assembled on one side of the machine body, which is far away from the fixed plate, and is used for installing a flight controller so as to perform test work;
and the power assembly is fixedly assembled at the free end of the machine body in a centrosymmetric mode, and provides basic power for the machine body so as to test the flight controller.
Further, the power assembly includes:
a brushless motor fixedly assembled at a free end of the body in a vertical direction;
and the paddle is switched to the action end of the brushless motor.
Further, unmanned aerial vehicle flight mechanism still includes wireless data transmission platform, wireless data transmission platform is fixed to be located on the organism and be located one side of flight control mounting box sets up the aim at and transmits unmanned aerial vehicle's basic flight parameter to the host computer.
Further, fixed chassis includes the vertical slide bar of horizontal support frame and left and right sides, the spout has been seted up on the relative lateral wall of vertical slide bar, the slide bar constitutes sliding connection with the spout, sets up aim at restriction unmanned aerial vehicle at the ascending home range of vertical side to be convenient for detect unmanned aerial vehicle's the gesture of taking off.
Further, debugging fixed establishment still includes the foot rest, the foot rest with central symmetry form arrange in the bottom of fixed chassis sets up aim at: firstly, stably supporting and fixing the underframe; secondly, offset unmanned aerial vehicle lift.
Further, the foot rest sets up to the sucking disc formula, and the aim at who sets up utilizes suction to offset unmanned aerial vehicle's lift to make fixed chassis stable, prevent that disturbance input from influencing the observation result.
Compared with the prior art, the utility model has the following beneficial effects: according to the indoor debugging equipment for the multi-rotor unmanned aerial vehicle, the debugging fixing mechanism, the attitude detection mechanism and the unmanned aerial vehicle flying mechanism are arranged, basic conditions are provided for debugging of the multi-rotor unmanned aerial vehicle, the unmanned aerial vehicle needing parameter debugging can be subjected to flight testing directly in an indoor environment, the testing steps of an unmanned aerial vehicle flying controller are simplified, convenient detection is provided for parameter adjustment of the unmanned aerial vehicle, various data during flight testing can be monitored in real time, and data support is provided for subsequent reliable flight of an aircraft.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic diagram of the overall assembly structure of the indoor debugging equipment of the multi-rotor unmanned aerial vehicle;
fig. 2 is a schematic structural diagram of a debugging fixing mechanism of the indoor debugging equipment of the multi-rotor unmanned aerial vehicle;
fig. 3 is a schematic structural diagram of an attitude detection mechanism of the indoor debugging equipment of the multi-rotor unmanned aerial vehicle of the utility model;
fig. 4 is a schematic structural diagram of an unmanned aerial vehicle flight mechanism of the indoor debugging equipment of the multi-rotor unmanned aerial vehicle of the utility model;
in the figure: 1. 1-1 parts of a debugging fixing mechanism, 1-11 parts of a fixing bottom frame, 1-2 parts of a chute, 1-3 parts of a support column and a foot rest; 2. 2-1 parts of a posture detection mechanism, 2-2 parts of an inserted rod, 2-3 parts of a supporting plate, 2-4 parts of a sliding rod, 2-5 parts of a gyroscope angle turning instrument, 2-6 parts of a battery installation groove and a rotating assembly; 3. 3-1 parts of an unmanned aerial vehicle flight mechanism, 3-2 parts of a machine body, 3-3 parts of a flight control installation box, 3-31 parts of a power assembly, 3-32 parts of a brushless motor, 3-4 parts of blades, 3-5 parts of a wireless data transmission platform and a fixing plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides the following technical solutions: an indoor debugging of many rotor unmanned aerial vehicle is equipped, includes:
the debugging fixing mechanism 1 plays a role in offsetting the lift force of the unmanned aerial vehicle to stabilize the debugging equipment;
the attitude detection mechanism 2 is positioned right above the debugging and fixing mechanism 1, is in sliding connection with the debugging and fixing mechanism 1, and is used for detecting the flight attitude of the unmanned aerial vehicle;
unmanned aerial vehicle flight mechanism 3, its fixed assembly in the top of gesture detection mechanism 2 provides the basic hardware unit of unmanned aerial vehicle, carries out test work to flight controller.
The debugging fixing mechanism 1 includes:
a fixed base frame 1-1 arranged in a vertical direction;
and the support column 1-2 is fixedly arranged at the center of the fixed bottom frame 1-1 along the vertical direction.
The posture detection mechanism 2 includes:
the inserting rod 2-1 is vertically inserted into the free end of the supporting column 1-2 and is in sliding connection with the supporting column 1-2;
the supporting plate 2-2 is transversely arranged above the inserted bar 2-1 and is connected with the inserted bar 2-1 through a rotating assembly 2-6;
the sliding rod 2-3 is transversely inserted into the upper end of the inserting rod 2-1, and two ends of the sliding rod are respectively in sliding connection with the side wall of the fixed underframe 1-1;
a gyro angle 2-4 fixedly mounted on the supporting plate 2-2 and positioned at one side of the rotating assembly 2-6;
and the battery mounting groove 2-5 is fixedly assembled on the supporting plate 2-2 and is arranged at the same side as the gyroscope 2-4.
The battery mounting grooves 2-5 are of detachable design, batteries with different capacities can be mounted according to the type to be tested, and power is provided for the unmanned aerial vehicle flight system.
In one embodiment, the rotating assemblies 2-6 are a combination of rotating fasteners and rotating balls, and in other embodiments, other types of engagement members are also possible.
Unmanned aerial vehicle flying mechanism 3 includes:
the machine body 3-1 is transversely arranged right above the supporting plate 2-2 and is fixedly connected with the supporting plate 2-2 through a fixing plate 3-5;
the flight control installation box 3-2 is fixedly assembled on one side, away from the fixed plate 3-5, of the machine body 3-1;
and the power assembly 3-3 is fixedly assembled at the free end of the machine body 3-1 in a central symmetry mode.
The flight control installation box 3-2 is of a detachable design, and different flight controllers can be installed on different unmanned aerial vehicles 3-1 to perform multiple tests according to design requirements, so that the most reliable detection data can be obtained.
The power assembly 3-3 includes:
the brushless motor 3-31 is fixedly assembled at the free end of the machine body 3-1 along the vertical direction;
and the paddle 3-32 is connected with the action end of the brushless motor 3-31 in a switching way.
In one embodiment, the power assemblies 3-3 are arranged in four groups, and the brushless motors 3-31 drive the blades 3-32 to provide basic power for the unmanned aerial vehicle. In other embodiments, the specific number of power assemblies 3-3 is determined by design requirements.
The unmanned aerial vehicle flight mechanism 3 further comprises a wireless data transmission platform 3-4, and the wireless data transmission platform 3-4 is fixedly arranged on the machine body 3-1 and is positioned on one side of the flight control installation box 3-2.
In other embodiments, the unmanned aerial vehicle flight mechanism 3 is further provided with a magnetic compass, a barometer and other devices, wherein the magnetic compass provides data of the heading angle of the unmanned aerial vehicle, detects the horizontal state of the unmanned aerial vehicle in real time, and reflects the yaw condition of the unmanned aerial vehicle; the barometer calculates the height of the unmanned aerial vehicle and detects the vertical direction state of the unmanned aerial vehicle in real time.
The fixed underframe 1-1 comprises a transverse support frame and vertical sliding rods at the left side and the right side, sliding grooves 1-11 are formed in opposite side walls of the vertical sliding rods, and the sliding rods 2-3 are in sliding connection with the sliding grooves 1-11.
The debugging and fixing mechanism 1 further comprises foot rests 1-3, and the foot rests 1-3 are arranged at the bottom end of the fixed underframe 1-1 in a centrosymmetric mode.
In one embodiment, the stands 1-3 are provided in four groups, and are arranged at four corners of the fixed base frame 1-1 in a central symmetrical manner. In other embodiments, the specific number of legs 1-3 is determined by design requirements.
The foot rest 1-3 is in a sucker type.
The working principle of the utility model is as follows:
1. an operator presses the fixed underframe 1-1 downwards to extrude the air in the suction cup type foot rest 1-3 to be tightly attached to the ground;
2. installing a flight controller in a flight control installation box 3-2, installing a battery in a battery installation groove 2-5, and communicating circuits among the flight controller, a brushless motor 3-31, a wireless data transmission platform 3-4, a gyroscope rotation angle instrument 2-4 and the battery;
3. starting to test the flight attitude of the unmanned aerial vehicle, wherein the sliding rod 2-3 is positioned at the bottom end of the sliding chute 1-11, and the supporting plate 2-2 is in surface contact with the end part of the supporting column 1-2;
starting the brushless motor 3-31 to drive the blades 3-32 to rotate and provide a certain lift force for the body 3-1;
4. the machine body 3-1 is connected with the fixed plate 3-5 and the supporting plate 2-2 to move so as to drive the inserted rod 2-1 to generate upward displacement in the vertical direction relative to the supporting column 1-2;
5. the inserted link 2-1 drives the sliding rod 2-3 to generate upward displacement in the vertical direction relative to the fixed underframe 1-1;
meanwhile, the wireless data transmission platform 3-4 transmits the attitude data of the unmanned aerial vehicle in real time and transmits the attitude data to the upper computer;
7. until the sliding rod 2-3 moves to the top end of the sliding groove 1-11, the machine body 3-1 keeps a hovering state, the rotating assembly 2-6 reflects the debugging error of the unmanned aerial vehicle by utilizing the characteristic of multiple degrees of freedom, and then the data of the yaw error of the takeoff of the unmanned aerial vehicle is detected in real time through the gyroscope 2-4;
8. and (4) integrating various debugging data of the unmanned aerial vehicle and determining whether the flight controller meets the debugging requirements.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The utility model provides an indoor debugging of many rotor unmanned aerial vehicle is equipped which characterized in that, the debugging is equipped and is included:
the debugging fixing mechanism plays a role in offsetting the lift force of the unmanned aerial vehicle to stabilize the debugging equipment,
the debugging fixed establishment includes:
a fixed base frame arranged in a vertical direction;
the supporting column is fixedly arranged at the center of the fixed underframe along the vertical direction;
the attitude detection mechanism is positioned right above the debugging and fixing mechanism, is in sliding connection with the debugging and fixing mechanism and is used for detecting the flight attitude of the unmanned aerial vehicle,
the posture detection mechanism includes:
the inserted rod is vertically inserted into the free end of the supporting column and is in sliding connection with the supporting column;
the supporting plate is transversely arranged above the inserted rod and is connected with the inserted rod through a rotating assembly;
the sliding rod is transversely inserted into the upper end of the inserting rod, and two ends of the sliding rod are respectively in sliding connection with the side wall of the fixed underframe;
the gyroscope angle meter is fixedly assembled on the supporting plate and is positioned on one side of the rotating component;
the battery mounting groove is fixedly assembled on the supporting plate and is arranged at the same side as the gyroscope rotation angle instrument;
the unmanned aerial vehicle flying mechanism is fixedly assembled at the top end of the attitude detection mechanism;
the fixed underframe comprises a transverse support frame and vertical sliding rods arranged on the left side and the right side, sliding grooves are formed in opposite side walls of the vertical sliding rods, and the sliding rods are in sliding connection with the sliding grooves.
2. The indoor commissioning apparatus of claim 1, wherein said drone flight mechanism comprises:
the machine body is transversely arranged right above the supporting plate and is fixedly connected with the supporting plate through a fixing plate;
the flight control installation box is fixedly assembled on one side of the machine body, which is far away from the fixed plate;
and the power assembly is fixedly assembled at the free end of the machine body in a central symmetry mode.
3. The indoor commissioning apparatus of claim 2, wherein said power assembly comprises:
a brushless motor fixedly assembled at a free end of the body in a vertical direction;
and the paddle is switched to the action end of the brushless motor.
4. The indoor commissioning device of a multi-rotor drone of claim 2, wherein: unmanned aerial vehicle flight mechanism still includes wireless data transmission platform, wireless data transmission platform is fixed to be located on the organism and be located one side of flight control mounting box.
5. The indoor commissioning device of a multi-rotor drone of claim 1, wherein: the debugging and fixing mechanism further comprises foot frames which are arranged at the bottom end of the fixed bottom frame in a centrosymmetric mode.
6. The indoor commissioning device of a multi-rotor drone of claim 5, wherein: the foot rest is of a sucker type.
CN202122013294.XU 2021-08-25 2021-08-25 Indoor debugging equipment of multi-rotor unmanned aerial vehicle Active CN215622798U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122013294.XU CN215622798U (en) 2021-08-25 2021-08-25 Indoor debugging equipment of multi-rotor unmanned aerial vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122013294.XU CN215622798U (en) 2021-08-25 2021-08-25 Indoor debugging equipment of multi-rotor unmanned aerial vehicle

Publications (1)

Publication Number Publication Date
CN215622798U true CN215622798U (en) 2022-01-25

Family

ID=79901983

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202122013294.XU Active CN215622798U (en) 2021-08-25 2021-08-25 Indoor debugging equipment of multi-rotor unmanned aerial vehicle

Country Status (1)

Country Link
CN (1) CN215622798U (en)

Similar Documents

Publication Publication Date Title
CN106525375B (en) Self-adaptive system for detecting wind resistance of unmanned aerial vehicle
Sharf et al. Ground effect experiments and model validation with Draganflyer X8 rotorcraft
CN107272740B (en) Novel four-rotor unmanned aerial vehicle control system
JP2017132461A (en) Unmanned flying body characteristic measurement device and unmanned flying body evaluation system using the same
CN109229421B (en) Unmanned aerial vehicle power performance test system and method
CN103979106A (en) Rotor-type unmanned aerial vehicle automatically adjusting gravity center and adjustment method
CN108225809B (en) Ground test system for flight performance of unmanned aerial vehicle
CN108413956A (en) Multi-rotor aerocraft stability analysis platform
CN213259512U (en) Flying adsorption robot for bridge deflection detection
CN110254652A (en) A kind of unmanned plane recycling charging unit based on Horizontal Stable Platform
CN111707442A (en) Supersonic wind tunnel propeller numerical model measurement verification system and control method thereof
CN103984339B (en) Mechanical breakdown debugging apparatus for rotor craft
CN107036795B (en) Multifunctional debugging platform
Karásek et al. Free flight force estimation of a 23.5 g flapping wing MAV using an on-board IMU
CN215622798U (en) Indoor debugging equipment of multi-rotor unmanned aerial vehicle
CN111959819A (en) Multi-rotor unmanned aerial vehicle algorithm verification and parameter adjustment system and use method thereof
Setyawan et al. Linear quadratic regulator controller (LQR) for AR. Drone's safe landing
CN203870468U (en) Mechanical failure debugging device used for rotorcraft
CN206057971U (en) A kind of low latitude unmanned plane balance system
CN111216921A (en) Test system and test method for ground-imitating flight of unmanned aerial vehicle
CN115826602B (en) Unmanned aerial vehicle-based flight dynamic and accurate positioning management system and method
CN112171692B (en) Intelligent bridge deflection detection device and method
CN109813521A (en) A kind of plant protection drone wind field detection device
CN104699082A (en) Unmanned aerial vehicle whole inertial navigation test bench
CN209264238U (en) A kind of plant protection drone wind field detection device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20230913

Address after: Room 603-1, Building A, NetEase Digital Industry Base, No. 51 Yuanda Road, Jiangbei New District, Nanjing, Jiangsu Province, 210000

Patentee after: Nanjing naikela Intelligent Technology Co.,Ltd.

Address before: No.219, ningliu Road, Jiangbei new district, Nanjing, Jiangsu Province, 210032

Patentee before: Nanjing University of Information Science and Technology