WO2011069491A2 - Verfahren zur simulation des bewegungsverhaltens eines fluids in einem geschlossenen bewegten behältnis - Google Patents
Verfahren zur simulation des bewegungsverhaltens eines fluids in einem geschlossenen bewegten behältnis Download PDFInfo
- Publication number
- WO2011069491A2 WO2011069491A2 PCT/DE2010/001430 DE2010001430W WO2011069491A2 WO 2011069491 A2 WO2011069491 A2 WO 2011069491A2 DE 2010001430 W DE2010001430 W DE 2010001430W WO 2011069491 A2 WO2011069491 A2 WO 2011069491A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gravity
- container
- fluid
- center
- cog
- 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.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Definitions
- the present invention relates to a method for simulating the
- Movement behavior of a fluid in a closed moving container and the forwarding of thus determined web data to a downstream processing unit It further relates to the application of this method in the control of a vehicle and the application of this method when discharging a container having the disposable load of a
- Liquids in containers are not dimensionally stable, but react to each container movement with a proper movement. Depending on
- Degree of filling of the container different physical effects that can affect the shape of the movement and the proper movement of the container noticeably, especially if the container itself is maneuvered, so is moved.
- Such predictions may prevent the ejected tank from making a web change due to this intrinsic motion, which makes it collide with the original host vehicle, such as the aircraft.
- Such forecasts must be performed as simulations, for example, to obtain aircraft approvals or approvals for certain discharge maneuvers. However, they must also be performed to simulate certain dropping procedures on an aircraft, for example, so that no accidents, such as collisions of the dropped object with the discarding aircraft, occur during actual use.
- Characteristics of the fluid in the container to be known.
- the simulation of fluid movements in a container is conventionally based on equations of motion of frictionless and viscous flows carried out.
- Other computational approaches use very sophisticated relationships based on atomic physics and molecular motion. Although these methods are very accurate in the corresponding formulation, they require very large computer powers in order to arrive at a result. Such computer services are often not available on board vehicles and take even in the case of an external
- Simulation on the ground may take several hours or even days.
- the inventor has recognized that the freedom of movement of a fluid in a container - regardless of the shape of the container - by a
- Spheroids or ellipsoids can be surrounded with satisfactory accuracy.
- the center of gravity of the liquid always moves along an elliptical path along the surface of the spheroid or the ellipsoid.
- the drive for the liquid movement is dependent on the difference between the angle of inclination of the container and the solid angle of the
- Fault level deflects E, which has a container axis.
- the inventive method assumes that the center of gravity of the fluid volume moves on an elliptical path, a very simple and quickly feasible calculation of the behavior of the fluid in the container is made possible, on the one hand very quickly feasible and also on-board computers of the vehicle can be performed in near real time.
- the method is used when the container is part of a moving device or a vehicle, in particular the application in an aircraft or in a spacecraft is advantageous.
- this procedure for the predetermination of the
- Motion behavior of land vehicles or watercraft with a container containing a fluid e.g., a liquid.
- the downstream processing unit comprises a control computer of the moving device or of the vehicle and if then the expected mass forces acting on the container by the moving fluid are taken into account in the control of the moving device or of the vehicle.
- the path data and mass forces determined by the method are forwarded to the control computer of the vehicle.
- Subordinate processing unit has an on-board computer of the vehicle.
- the vehicle is preferably formed by an aircraft.
- This may either be a fighter jet discarding an auxiliary tank or a cruise missile having a liquid-filled tank, or it may be, for example, a cargo plane that is in air-drop
- Vehicles or other loads throws, which themselves have again filled with a fluid container.
- the expected mass forces, which act on the container by the moving fluid are taken into account in determining permissible release conditions for the ejectable load.
- On-board computer of the vehicle forwarded.
- the on-board computer can then take into account the current
- Trajectory data make a decision whether the release of the load at a certain time is allowed and may release the release if necessary.
- the on-board computer can also suggest to the driver a corresponding movement procedure for the vehicle, which is the safe
- a departure simulation of the disposable load can be performed, in which the expected mass forces acting on the container by the agitated fluid are calculated upon the determination of an allowable discharge condition for the disposable load become. This may either be done during the flight or may be performed on the ground independently of a current flight and a current launch mission to demonstrate and obtain the flight certification of the aircraft and the equipment involved, such as the droppings.
- the invention is also directed to a computer program with program code means for carrying out all the steps of the method according to the invention when the program is executed on a computer.
- the invention is directed to a computer program product with program code means which are stored on a computer-readable medium to perform the inventive method when the program is executed on a computer.
- FIG. 2 shows a representation of the outflow behavior of an additional tank after it has been dropped from an aircraft
- Fig. 3 is a flock of ellipses, the different
- Fig. 5 is an illustration of the attacking at the center of gravity of the fluid
- Fig. 1 is a longitudinal section cut open additional tank shown schematically
- the auxiliary tank 10 has an outer shell
- the auxiliary tank 10 has a front tank chamber 14 and a rear one
- Tank chamber 15 each forming a first and a second container for a fluid.
- the fluid in the present case is liquid fuel.
- the front tank chamber 14 is close to a fluid 16 completely filled, while the rear tank chamber 15 is filled to about half with a fluid 17.
- FIG. 2 shows the temporally successive phases of movement of an auxiliary tank 10 ejected by the aircraft 1.
- FIG. 2 shows the temporally successive phases of movement of an auxiliary tank 10 ejected by the aircraft 1.
- the additional tank 10 rotates after detachment from the aircraft 1 about its transverse axis by the tail 10 'of the additional tank 10 drops faster than the bow 10 "At the same time, the additional tank also performs a (not recognizable in the illustration ) Rotation about an axis parallel to the axis of movement of the aircraft.
- Aircraft is located in an unfavorable residual fuel volume in the tank one of the illustrated in Fig. 2 ideal departure movement of
- Additional tanks 10 deviate movement occur, which is induced by the proper movement of the fuel in the tank.
- the bow 10 "or the tail 10 'of the auxiliary tanks 10 may collide with the wing of the aircraft 1 in the worst case, but such a collision must be reliably avoided 1, with the current movement data of the aircraft, the movement data of the additional tank detached from the aircraft, the
- Aircraft 1 precalculated, so simulated, be.
- the inventor has now found that the trajectory of the center of gravity of a moving in a container fluid can be approximately represent an ellipse.
- Fig. 3 shows a family of numerically determined
- Container is 5%.
- the next inner ellipse already describes a degree of filling of 10%. With a 100% filled container, the ellipse reduces to the intersection of the two axes.
- V L for the volume of the fluid
- V f. for the
- Capacity of the container stand Acts on the resting container, for example on that shown in Fig. 1
- Supplementary tank 10 and thus also on the fluid resting therein, such as the fuel, a sudden external disturbance, such as a
- ⁇ where XE and z E are the coordinates of the center of gravity (CoG) on the elliptical orbit with the semiaxes a and b;
- L is a damping term that reflects the viscosity influence of the moving fluid.
- This damping term L can be determined experimentally; for kerosene this attenuation term is in the range of 0.1 to 0.25.
- the effective fluid bearing force F generated by the Fluid acting on the wall 11 of the container 10 is given by the following formula:
- Movements can be used.
- departure behavior of an external fuel additive tank from an aircraft can be calculated hereby.
- inventive process is also applicable to other fluent materials, such as fluidized bed solids.
- Reference signs in the claims, the description and the drawings are only for a better understanding of the invention and are intended to the
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Automation & Control Theory (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Vibration Prevention Devices (AREA)
- Devices For Use In Laboratory Experiments (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP10816302A EP2510467A2 (de) | 2009-12-11 | 2010-12-09 | Verfahren zur simulation des bewegungsverhaltens eines fluids in einem geschlossenen bewegten behältnis |
| BR112012014050A BR112012014050A2 (pt) | 2009-12-11 | 2010-12-09 | processo para simulação do comportamento de movimento de um fluido em um recipiente fechado, movido |
| US13/514,684 US9038961B2 (en) | 2009-12-11 | 2010-12-09 | Method for simulating the movement behaviour of a fluid in a closed, moving container |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009057878.1A DE102009057878B4 (de) | 2009-12-11 | 2009-12-11 | Verfahren zur Steuerung eines Fahrzeugs und zum Abwerfen einer Last von einem Fahrzeug |
| DE102009057878.1 | 2009-12-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2011069491A2 true WO2011069491A2 (de) | 2011-06-16 |
| WO2011069491A3 WO2011069491A3 (de) | 2012-03-01 |
Family
ID=43992803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2010/001430 Ceased WO2011069491A2 (de) | 2009-12-11 | 2010-12-09 | Verfahren zur simulation des bewegungsverhaltens eines fluids in einem geschlossenen bewegten behältnis |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9038961B2 (de) |
| EP (1) | EP2510467A2 (de) |
| BR (1) | BR112012014050A2 (de) |
| DE (1) | DE102009057878B4 (de) |
| WO (1) | WO2011069491A2 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009057878B4 (de) * | 2009-12-11 | 2024-01-25 | Airbus Defence and Space GmbH | Verfahren zur Steuerung eines Fahrzeugs und zum Abwerfen einer Last von einem Fahrzeug |
| US11379627B2 (en) * | 2017-03-31 | 2022-07-05 | The Boeing Company | Vehicular liquid container design and manufacture |
| CN107256283B (zh) * | 2017-05-10 | 2021-04-20 | 西安交通大学 | 一种飞行器燃油箱内串油特性的高精度分析方法 |
| JP7012944B2 (ja) * | 2018-10-11 | 2022-01-31 | オムロン株式会社 | シミュレーション装置、シミュレーション方法及びシミュレーションプログラム |
| US11462128B2 (en) * | 2018-11-20 | 2022-10-04 | Arizona Board Of Regents On Behalf Of Arizona State University | Method and apparatus for simulated hydrodynamics in mixed-reality fluid vessels |
Family Cites Families (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3149601A (en) * | 1962-04-30 | 1964-09-22 | Raytheon Co | Self-adaptive control system |
| US3754601A (en) * | 1972-06-26 | 1973-08-28 | A Linkewich | Fire bombing method and apparatus |
| US3901467A (en) * | 1974-11-06 | 1975-08-26 | Field Aviat Company Limited | Aircraft fire bombing system |
| US4789170A (en) * | 1987-05-26 | 1988-12-06 | Reberland Equipment, Inc. | Tank baffles |
| JPH05116689A (ja) | 1991-10-25 | 1993-05-14 | Mitsubishi Heavy Ind Ltd | 航空機の燃料タンク投棄装置 |
| US5320185A (en) * | 1992-06-15 | 1994-06-14 | Erickson Air-Crane Co. | Aircraft fluid drop system |
| US5452869A (en) * | 1992-12-18 | 1995-09-26 | Hughes Aircraft Company | On-board three-axes attitude determination and control system |
| WO1999061773A2 (en) * | 1998-04-08 | 1999-12-02 | Lockheed Martin Corporation | Anti-slosh liquid propellant tank for launch vehicles |
| US6889776B2 (en) * | 2000-08-08 | 2005-05-10 | The University Of Hong Kong | Airborne water diffuser |
| JP3679070B2 (ja) * | 2001-06-22 | 2005-08-03 | 本田技研工業株式会社 | 燃料電池自動車の制御装置 |
| EP1552066A4 (de) * | 2002-05-29 | 2007-08-01 | Gary A Rogers | Schneebeseitigungssystem |
| US8924049B2 (en) * | 2003-01-06 | 2014-12-30 | General Electric Company | System and method for controlling movement of vehicles |
| US7337021B2 (en) * | 2003-03-26 | 2008-02-26 | The Boeing Company | Robust spacecraft controller and method for designing same |
| WO2005030571A2 (en) * | 2003-07-03 | 2005-04-07 | Advanced Maritime Support Technology, Inc. | Marine payload handling craft and system |
| US7410130B2 (en) * | 2003-12-03 | 2008-08-12 | The Boeing Company | Star-tracker-based attitude determination for spinning spacecraft |
| US7580778B2 (en) | 2005-06-23 | 2009-08-25 | Honeywell International Inc. | Methods and systems for controlling multi-body vehicles with fuel slosh |
| US20070007021A1 (en) * | 2005-07-11 | 2007-01-11 | Colin Regan | Fire retardent smart bombs |
| DE602006014651D1 (de) * | 2006-03-23 | 2010-07-15 | Elasis Societa Consortile Per | Verfahren zur Bestimmung der dynamischen Verteilung eine Flüssigkeit in einem Fahrzeugtank |
| DE102007025619B4 (de) * | 2007-06-01 | 2012-11-15 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Steuerung eines hydraulischen Stellers |
| FR2938498B1 (fr) * | 2008-11-17 | 2012-02-03 | Gaztransp Et Technigaz | Navire ou support flottant equipe d'un dispositif d'attenuation des mouvements de carenes liquides |
| FR2945511B1 (fr) * | 2009-05-14 | 2011-07-22 | Saipem Sa | Navire ou support flottant equipe d'un dispositif de detection des mouvements de carenes liquides |
| US8380473B2 (en) * | 2009-06-13 | 2013-02-19 | Eric T. Falangas | Method of modeling dynamic characteristics of a flight vehicle |
| DE102009057878B4 (de) * | 2009-12-11 | 2024-01-25 | Airbus Defence and Space GmbH | Verfahren zur Steuerung eines Fahrzeugs und zum Abwerfen einer Last von einem Fahrzeug |
| US8494697B2 (en) * | 2011-03-28 | 2013-07-23 | The Boeing Company | Methods and systems for predicting water vessel motion |
| US8868260B2 (en) * | 2012-11-01 | 2014-10-21 | Honeywell International Inc. | Consolidated vehicle propulsion control using integrated modular avionics |
-
2009
- 2009-12-11 DE DE102009057878.1A patent/DE102009057878B4/de active Active
-
2010
- 2010-12-09 EP EP10816302A patent/EP2510467A2/de not_active Withdrawn
- 2010-12-09 WO PCT/DE2010/001430 patent/WO2011069491A2/de not_active Ceased
- 2010-12-09 US US13/514,684 patent/US9038961B2/en active Active
- 2010-12-09 BR BR112012014050A patent/BR112012014050A2/pt not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| None |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011069491A3 (de) | 2012-03-01 |
| US20140107859A1 (en) | 2014-04-17 |
| US9038961B2 (en) | 2015-05-26 |
| DE102009057878A1 (de) | 2011-06-16 |
| DE102009057878B4 (de) | 2024-01-25 |
| EP2510467A2 (de) | 2012-10-17 |
| BR112012014050A2 (pt) | 2016-04-12 |
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