EP2480478A1 - Suspended payload platform thrusted by fluid mass flow generators - Google Patents

Suspended payload platform thrusted by fluid mass flow generators

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Publication number
EP2480478A1
EP2480478A1 EP10749902A EP10749902A EP2480478A1 EP 2480478 A1 EP2480478 A1 EP 2480478A1 EP 10749902 A EP10749902 A EP 10749902A EP 10749902 A EP10749902 A EP 10749902A EP 2480478 A1 EP2480478 A1 EP 2480478A1
Authority
EP
European Patent Office
Prior art keywords
fluid mass
mass flow
payload platform
payload
action
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.)
Granted
Application number
EP10749902A
Other languages
German (de)
French (fr)
Other versions
EP2480478B1 (en
Inventor
Gábor STÉPÁN
László KOVÁCS
Richárd WOHLFART
Mihály JURÁK
Dániel BACHRATHY
András Ó
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.)
Budapesti Muszaki es Gazdasagtudomanyi Egyetem
Original Assignee
Budapesti Muszaki es Gazdasagtudomanyi Egyetem
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 Budapesti Muszaki es Gazdasagtudomanyi Egyetem filed Critical Budapesti Muszaki es Gazdasagtudomanyi Egyetem
Publication of EP2480478A1 publication Critical patent/EP2480478A1/en
Application granted granted Critical
Publication of EP2480478B1 publication Critical patent/EP2480478B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack

Definitions

  • the present invention relates to th-rusting a payload platform suspended like a pendulum on a single cable or -on parallel cables attached to a supporting el-ement.
  • the pendulum like suspension system may include complex multi- body or multi-cable sections but at least one section of it is limited to a single cable or parallel cables.
  • the present invention is directed to thrusting a payload platform of an aerial tethered robot or a suspended rescue system or a crane system.
  • the concept of the aerial tethered system was inspired by deep sea marine robotics where a host ship uses a tethered robot to survey the site of a shipwreck and deploy tiny robotic agents from the tethered robot into an opening within the sunken vessel. This concept was applied to aerial systems .
  • the aerial robot may include at least one pair of counter-rotating blades or propellers, which may be contained within a circumferential shroud or a duct.
  • the aerial robot may have the ability to hover and move indefinitely getting the electric power through a tether anchoring the robot to a ground station.
  • the robot is suitable for remote observation, environment detection, communication, but due to the lifting force powered by fans not suitable for carrying heavy payloads.
  • a design of a tethered aerial robot is presented by P. J. McKerrow and D.
  • Ratner originally published as: McKerrow, PJM & Ratner, D, The design of a tethered aerial robot, IEEE International Conference on Robotics and Automation 2007, Rome, Italy, 10-14 April 2007, 355-360. Copyright 2007 IEEE; in which the concept of a tethered aerial robot swinging on the end of a tether is described.
  • the weight of the robot is carried by the tether and the thrusting force is generated -by two fans with parallel axis.
  • the critical issue in such suspended systems is the under-actuation of the suspended payload.
  • the two ducted fans with parallel axes can only provide a one- directional thrust force and a resulting moment acting upon the suspended payload as independent control inputs.
  • the number of actuators is lower than the degrees of f-reedom of the suspended payload.
  • a suspended payload platform can be a part of a robotic system or that of a crane structure as well.
  • Pendulum-like suspension systems that include single or parallel cables do not allow the actuation of the payload platform through the cables only.
  • the required position and orientation of the payload can only be provided with the use of additional actuators, because of the pendulum-like behavior of these systems.
  • the present invention involves a new system which solves the aforementioned problems, as well as other problems that will become apparent from an understanding of the following description.
  • the invention is based on the recognition that a payload platform suspended like a pendulum on single or parallel cables can only be controlled with serious limitations by a single direction thrust force -or a pair of thrust forces. So the object of the invention is to provide a system of thrust forces of fluid mass flows for moving a payload platform the weight of which is compensated by pendulum-like single or parallel suspending cables attached to a suspending element. In the system of thrust forces the fluid mass flows are generated by at least three fluid mass flow generators each of them providing a force vector.
  • Fluid mass flow generator is a system that determines the magnitude and the direction of the thrust force vector produced by emission of fluid or solid body particles.
  • fluid mass flow can be made by an axial or radial fan without or within a tube, nozzle with routed fluid mass flow from an external or on board compressor, nozzle with routed fluid mass flow from - A - an external or on board fluid bottle, fluid storage tank.
  • the source of thrust can be turned, deflectors including slewable nozzles or controlled valves can be used at the inlet (s) or outlet (s) of the source of the fluid mass flow, and variable blade pitch impellers -can be applied.
  • the fluid mass flow generators are fans, preferably ducted fans provided with reversible blade pitch impellers.
  • two lines of action of the thrust force vectors may be parallel whereas the third line of action of the thrust force is a skew line at an angle to the parallel lines of actions, or two lines of action of the thrust force vectors are parallel whereas the line of action of a third thrust force vector is a skew line at a right angle to the parallel lines of actions.
  • FIGURE 1 shows a simplified model of the pendulum-like suspended payload platform.
  • FIGURES 2/a, 2/b, 2/c and 2/d present concepts for pendulum-like single and parallel cable based suspending systems .
  • FIGURES 3/a and 3/b show arrangements of fluid mass flow generators (for simplicity modeled by ducted fans) and the supplied thrust force for two different designs that use three or six fluid mass flow generators, respectively.
  • FIGURE 4 shows a possible embodiment of a 3 fluid mass flow generator based design.
  • FIGURE 5 shows a possible embodiment of a six fluid mass flow generator based design.
  • the main operating functions that the pendulum-like suspended payload platform PP should provide are: compensating for the gravity by using single or parallel cables attached to the supporting element SE, and making thrust for controlling the position and orientation of the payload PL.
  • the swinging out of the payload is described by the nutation angle, while its polar displacement is described by the precession angle.
  • turning the payload is characterized by the rotation angle about an axis fixed to the payload.
  • the roll and pitch of the payload e.g., and not by way of limitation, is to be set by additional fluid mass flow generators or by using windable orienting cables.
  • FIGURES 2/a, 2/b, 2/c and 2/d some possible solutions are presented for the pendulum-like suspension system composed at least in part of single or parallel cable segments. Solutions described in FIGURE 2/b, 2/c and 2/d utilizing windable cables for the actuation of the roll and pitch of the payload platform, while concept in FIGURE 2/a requires complementary actuators such as fans, gyros, etc.
  • the primary design constraint is the amount of the required thrust.
  • FIGURE 3/a there are two fluid mass flow generators that pull the payload platform from the vertical direction and a complementary transversal fluid mass flow generator is used to provide actuation in the direction of precession.
  • the two parallel fluid mass flow generators can exert high thrust in a specific direction.
  • FIGURE 3/b six identical fluid mass flow generators are utilized. Considering these generators as ducted fans it is apparent that the thrust supplied by the smaller fans will be lower, however they provide better maneuverability for the suspended payload platform. This is because the special triangular arrangement of the fans that ensures closely uniform thrusting.
  • FIGURE 4 and FIGURE 5 show the possible embodiments of the three and six fluid mass flow generator based designs. These designs show the similarities and main differences between the two concepts as well. Both concepts utilizes ducted fans as thrust sources, since these devices have lower weight (and smaller size) compared to other solutions.
  • the three fluid mass flow generator based design reaches a singular position. If the thrust force is not reversible, a small change of the position of the payload platform may require infinite angular accelerations. Reversing of the thrust may also be needed for the orientation of the payload platform when it hangs vertically down. In addition, the moment generated by the opposite direction thrust forces can be used to compensate for the inertial effects of the payload.
  • the design concept based on three fluid mass flow generators should incorporate two ducted fans arranged in parallel and a complementary ducted fan with transversal air mass flow, while the thrusting forces should be reversible at all ducted fans.
  • the role of the fluid mass flow generators cannot be separated. They are identical to each other and contribute to the thrusting and turning of the payload platform equally.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A fluid mass flow based thrusting system for facilitating full penduling actuation of single cable or parallel cables suspended payload especially but not exclusively for aerial tethered/cable suspended robots, rescue systems and crane systems is provided. The required position and orientation of the payload is provided with the use of additional actuators along desired trajectories. Using at least three fluid mass flow generators in the proposed geometrical arrangements enable the full actuation of the nutation, precession and rotation/yaw angles of the pendulum like a suspended payload platform (pp). The roll and pitch of the payload, e.g., and not by way of limitation, is to be set by additional fluid mass flow generators or by using windable orienting cables or gyros.

Description

-Jl-
'Suspended payload platform t-hrusted -by -fluid mass flow generators
TECHNICAL FIELD The present invention relates to th-rusting a payload platform suspended like a pendulum on a single cable or -on parallel cables attached to a supporting el-ement. The pendulum like suspension system may include complex multi- body or multi-cable sections but at least one section of it is limited to a single cable or parallel cables. In particular, and not by way of limitation, the present invention is directed to thrusting a payload platform of an aerial tethered robot or a suspended rescue system or a crane system. BACKGROUND
The concept of the aerial tethered system was inspired by deep sea marine robotics where a host ship uses a tethered robot to survey the site of a shipwreck and deploy tiny robotic agents from the tethered robot into an opening within the sunken vessel. This concept was applied to aerial systems .
In US-2007200027 patent publication an aerial robot is disclosed. The aerial robot may include at least one pair of counter-rotating blades or propellers, which may be contained within a circumferential shroud or a duct. The aerial robot may have the ability to hover and move indefinitely getting the electric power through a tether anchoring the robot to a ground station. The robot is suitable for remote observation, environment detection, communication, but due to the lifting force powered by fans not suitable for carrying heavy payloads. A design of a tethered aerial robot is presented by P. J. McKerrow and D. Ratner originally published as: McKerrow, PJM & Ratner, D, The design of a tethered aerial robot, IEEE International Conference on Robotics and Automation 2007, Rome, Italy, 10-14 April 2007, 355-360. Copyright 2007 IEEE; in which the concept of a tethered aerial robot swinging on the end of a tether is described. In this approach the weight of the robot is carried by the tether and the thrusting force is generated -by two fans with parallel axis. The critical issue in such suspended systems is the under-actuation of the suspended payload. The two ducted fans with parallel axes can only provide a one- directional thrust force and a resulting moment acting upon the suspended payload as independent control inputs. Thus, the number of actuators is lower than the degrees of f-reedom of the suspended payload.
However the problem mentioned above can be extended to any payload platform suspended like a pendulum on single cable or on parallel cables and actuated by thrusting forces irrespective of the application in the technology, i.e., a suspended payload platform can be a part of a robotic system or that of a crane structure as well.
Pendulum-like suspension systems that include single or parallel cables do not allow the actuation of the payload platform through the cables only. The required position and orientation of the payload can only be provided with the use of additional actuators, because of the pendulum-like behavior of these systems.
We have set ourselves the objective with this invention to improve the thrusting of suspended payload platfo-rms.
SUMMARY
The present invention involves a new system which solves the aforementioned problems, as well as other problems that will become apparent from an understanding of the following description.
The invention is based on the recognition that a payload platform suspended like a pendulum on single or parallel cables can only be controlled with serious limitations by a single direction thrust force -or a pair of thrust forces. So the object of the invention is to provide a system of thrust forces of fluid mass flows for moving a payload platform the weight of which is compensated by pendulum-like single or parallel suspending cables attached to a suspending element. In the system of thrust forces the fluid mass flows are generated by at least three fluid mass flow generators each of them providing a force vector.
Fluid mass flow generator is a system that determines the magnitude and the direction of the thrust force vector produced by emission of fluid or solid body particles. In particular, and not by way of limitation, fluid mass flow can be made by an axial or radial fan without or within a tube, nozzle with routed fluid mass flow from an external or on board compressor, nozzle with routed fluid mass flow from - A - an external or on board fluid bottle, fluid storage tank. In particular, and not by way of limitation, for vectoring, including the reversing of the thrust produced by the previously listed systems, the source of thrust can be turned, deflectors including slewable nozzles or controlled valves can be used at the inlet (s) or outlet (s) of the source of the fluid mass flow, and variable blade pitch impellers -can be applied.
In a possible embodiment, a three fluid mass flow generator based design is described.
In a possible embodiment, a six fluid mass flow generator based design is described.
In possible embodiments the fluid mass flow generators are fans, preferably ducted fans provided with reversible blade pitch impellers.
In case of three mass flow generators two lines of action of the thrust force vectors may be parallel whereas the third line of action of the thrust force is a skew line at an angle to the parallel lines of actions, or two lines of action of the thrust force vectors are parallel whereas the line of action of a third thrust force vector is a skew line at a right angle to the parallel lines of actions.
In case of six mass flow generators, six lines of action of the thrust force vectors are coplanar, or are grouped into three pairs of parallel lines of action thrust force vectors that can be axisymmetrical to the bisectors of an equilateral triangle. The most important advantage of the invention is that the payload platform suspended like a pendulum on single or parallel cables is fully actuated.
BRIEF DESCRIPTION OF THE DRAWINGS In the following, the essential features of the invention will be described in detail by showing two preferred embodiments, with reference to the figures of the attached drawing.
FIGURE 1 shows a simplified model of the pendulum-like suspended payload platform.
FIGURES 2/a, 2/b, 2/c and 2/d present concepts for pendulum-like single and parallel cable based suspending systems .
FIGURES 3/a and 3/b show arrangements of fluid mass flow generators (for simplicity modeled by ducted fans) and the supplied thrust force for two different designs that use three or six fluid mass flow generators, respectively.
FIGURE 4 shows a possible embodiment of a 3 fluid mass flow generator based design. FIGURE 5 shows a possible embodiment of a six fluid mass flow generator based design.
DETAILED DESCRIPTION
As it is seen in FIGURE 1, the main operating functions that the pendulum-like suspended payload platform PP should provide are: compensating for the gravity by using single or parallel cables attached to the supporting element SE, and making thrust for controlling the position and orientation of the payload PL. The swinging out of the payload is described by the nutation angle, while its polar displacement is described by the precession angle. In addition, turning the payload is characterized by the rotation angle about an axis fixed to the payload. The roll and pitch of the payload, e.g., and not by way of limitation, is to be set by additional fluid mass flow generators or by using windable orienting cables.
The detailed analysis of the engineering systems and physical processes that fit the requirements has resulted in the mechanical and control related design principles for generating concepts for the pendulum-like suspended payload platform. It was found that for full actuation of the nutation, precession and rotation of the payload, a possible solution is the use of fluid mass flow generators such as ducted fans. In addition, it was concluded that auxiliary suspending cables can be used to compensate for the roll and pitch of the payload.
In FIGURES 2/a, 2/b, 2/c and 2/d, some possible solutions are presented for the pendulum-like suspension system composed at least in part of single or parallel cable segments. Solutions described in FIGURE 2/b, 2/c and 2/d utilizing windable cables for the actuation of the roll and pitch of the payload platform, while concept in FIGURE 2/a requires complementary actuators such as fans, gyros, etc. In case of the pendulum-like suspended payload platform, the primary design constraint is the amount of the required thrust. By seeing that the nutation of the payload platform is proportional to the fluid mass flow generated, it should be maximized in order to provide a large working volume. On the other hand, by increasing the "fluid mass flow, the noise and the blow of the unit may become disturbing and the size/weight of the device may constrain the applicability of the whole system. Making and vectoring the thrust, and rotating the payload were analyzed in parallel to the two concepts with different (high and low) thrust requirements.
In FIGURE 3/a there are two fluid mass flow generators that pull the payload platform from the vertical direction and a complementary transversal fluid mass flow generator is used to provide actuation in the direction of precession. The two parallel fluid mass flow generators can exert high thrust in a specific direction. In FIGURE 3/b six identical fluid mass flow generators are utilized. Considering these generators as ducted fans it is apparent that the thrust supplied by the smaller fans will be lower, however they provide better maneuverability for the suspended payload platform. This is because the special triangular arrangement of the fans that ensures closely uniform thrusting. FIGURE 4 and FIGURE 5 show the possible embodiments of the three and six fluid mass flow generator based designs. These designs show the similarities and main differences between the two concepts as well. Both concepts utilizes ducted fans as thrust sources, since these devices have lower weight (and smaller size) compared to other solutions.
In order to achieve good maneuverability for the three fluid mass flow generator based payload platform, the direction of the generated thrust force has to be controlled. In addition, turning the payload in a nutated position with fixed precession requires a rotatable mechanical interface or a gyro system. In case of the six fluid mass flow generator based concept, by varying the performance of the individual fans, the generating moment can rotate the payload without the need of further actuators. Hence, this concept results in an easier solution for rotating the suspended payload platform and the payload.
When the payload platform is to be stopped in a hanging down position (at zero nutation) , the three fluid mass flow generator based design reaches a singular position. If the thrust force is not reversible, a small change of the position of the payload platform may require infinite angular accelerations. Reversing of the thrust may also be needed for the orientation of the payload platform when it hangs vertically down. In addition, the moment generated by the opposite direction thrust forces can be used to compensate for the inertial effects of the payload.
According to the above considerations, it can be concluded that the design concept based on three fluid mass flow generators should incorporate two ducted fans arranged in parallel and a complementary ducted fan with transversal air mass flow, while the thrusting forces should be reversible at all ducted fans. However, in case of the concept with six fluid mass flow generators, the role of the fluid mass flow generators cannot be separated. They are identical to each other and contribute to the thrusting and turning of the payload platform equally.
Although preferred embodiments of the present invention have been illustrated in the accompanying Drawings and described in the foregoing Detailed Description, it is understood that the invention is not limited to the embodiments disclosed and to the use of ducted fans as fluid mass flow generators, but is capable of numerous rearrangements, modifications, and substitutions without departing from the concept of the invention as set forth and defined by the following claims.

Claims

1. A payload platform the weight of which is compensated by suspension system connected to a suspending element and thrusted by fluid mass flows; characterized in that,
the suspension system is composed in part or in whole of single or parallel suspending cable segments,
the fluid mass flows are generated by at least three fluid mass flow generators,
each of the fluid mass flow generators provides a thrust force vector.
2. The payload platform of claim 1 characterized in that the thrust force vectors are arranged in at least three different lines of action.
3. The payload platform of claim 2 characterized in that the lines of action of the thrust force vectors are arranged to avoid single point intersection.
4. The payload platform of claim 1 characterized in that there are three fluid mass flow generators which are three fans.
5. The payload platform of claim 4 characterized in that the fans are ducted fans.
6. The payload platform of claim 5 characterized in that the ducted fans are provided with reversible blade pitch impellers.
7. The payload platform of claim 1 characterized in that two lines of action of the thrust force vectors (Fτ,main) are parallel whereas a third line of action of the thrust force (FT(trans) is a skew line at an angle to the parallel lines of actions.
8. The payload platform of claim 1 characterized in that two lines of action of the thrust force vectors (Fτ,main) are parallel whereas a third line of action of the thrust force (Fτ,trans) is a skew line at a right angle to the parallel lines of actions .
9. The payload platform of claim 1 characterized in that there are six fluid mass flow generators, which are fans .
10. The payload platform of claim 9 characterized in that, the fans are six ducted fans.
11. The payload platform of claim 1 characterized in that six lines of action of the thrust force vectors (Fτ) are coplanar.
12. The payload platform of claim 1 characterized in that the six lines of action of the thrust force vectors (Fx) are grouped by three pairs of parallel lines of action.
13. The payload platform of claim 12
characterized in that the parallel lines of action of three pairs of the thrust force vectors (Fτ) are axisymmetrical to the perpendicular bisectors of the sides of an equilateral triangle.
EP10749902.2A 2009-07-28 2010-07-27 Suspended payload platform thrusted by fluid mass flow generators Not-in-force EP2480478B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU0900467A HUP0900467A2 (en) 2009-07-28 2009-07-28 Suspended payload platform thrusted by fluid mass flow generators
PCT/HU2010/000084 WO2011012915A1 (en) 2009-07-28 2010-07-27 Suspended payload platform thrusted by fluid mass flow generators

Publications (2)

Publication Number Publication Date
EP2480478A1 true EP2480478A1 (en) 2012-08-01
EP2480478B1 EP2480478B1 (en) 2014-12-17

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HU (1) HUP0900467A2 (en)
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US11142316B2 (en) 2018-02-08 2021-10-12 Vita Inclinata Technologies, Inc. Control of drone-load system method, system, and apparatus
US11746951B2 (en) 2019-02-26 2023-09-05 Vita Inclinata Ip Holdings Llc Cable deployment apparatus, system, and methods for suspended load control equipment
US11618566B1 (en) 2019-04-12 2023-04-04 Vita Inclinata Technologies, Inc. State information and telemetry for suspended load control equipment apparatus, system, and method
US11834305B1 (en) 2019-04-12 2023-12-05 Vita Inclinata Ip Holdings Llc Apparatus, system, and method to control torque or lateral thrust applied to a load suspended on a suspension cable
EP3778393B1 (en) 2019-08-13 2021-12-08 AIRBUS HELICOPTERS DEUTSCHLAND GmbH A load carrying assembly
US11873099B2 (en) 2020-12-02 2024-01-16 Airbus Helicopters Deutschland GmbH Load carrying assembly
WO2023211499A1 (en) 2022-04-29 2023-11-02 Vita Inclinata Ip Holdings Llc Machine learning real property object detection and analysis apparatus, system, and method
US11992444B1 (en) 2023-12-04 2024-05-28 Vita Inclinata Ip Holdings Llc Apparatus, system, and method to control torque or lateral thrust applied to a load suspended on a suspension cable

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Also Published As

Publication number Publication date
HUP0900467A2 (en) 2011-06-28
EP2480478B1 (en) 2014-12-17
WO2011012915A1 (en) 2011-02-03
HU0900467D0 (en) 2009-09-28

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