WO2020160749A1 - Optimising ship noise radiation using digital twins and controls - Google Patents

Optimising ship noise radiation using digital twins and controls Download PDF

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Publication number
WO2020160749A1
WO2020160749A1 PCT/EP2019/052655 EP2019052655W WO2020160749A1 WO 2020160749 A1 WO2020160749 A1 WO 2020160749A1 EP 2019052655 W EP2019052655 W EP 2019052655W WO 2020160749 A1 WO2020160749 A1 WO 2020160749A1
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WO
WIPO (PCT)
Prior art keywords
ship
virtual
behaviour
environment
state
Prior art date
Application number
PCT/EP2019/052655
Other languages
French (fr)
Inventor
Philip Maertens
Original Assignee
Siemens Industry Software Nv
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 Siemens Industry Software Nv filed Critical Siemens Industry Software Nv
Priority to PCT/EP2019/052655 priority Critical patent/WO2020160749A1/en
Publication of WO2020160749A1 publication Critical patent/WO2020160749A1/en

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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B17/00Systems involving the use of models or simulators of said systems
    • G05B17/02Systems involving the use of models or simulators of said systems electric
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B9/00Simulators for teaching or training purposes
    • G09B9/02Simulators for teaching or training purposes for teaching control of vehicles or other craft
    • G09B9/06Simulators for teaching or training purposes for teaching control of vehicles or other craft for teaching control of ships, boats, or other waterborne vehicles
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/10Geometric CAD
    • G06F30/15Vehicle, aircraft or watercraft design
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/20Design optimisation, verification or simulation

Abstract

The present invention is related to a method of and system for optimising operation of a ship as well as a ship comprising said system. By means of a digital twin of the ship and a model of the response of the environment of the ship a virtual behaviour of the ship is simulated. The virtual behaviour of the ship is optimised according to at least one predefined threshold. An optimised virtual operation state of the ship according to the optimised virtual behaviour of the ship is used to adjust the real operation state of the ship.

Description

Description
Optimising Ship Noise Radiation Using Digital Twins and
Controls
The present invention is related to a method of and system for optimising operation of a ship as well as a ship
comprising said system.
Ships are one of the major transportation means; from small one man boats to big cruise ships housing several thousand people or cargo/tanker ships able of carrying several
thousand tons of cargo or litres of oil-ore. Especially for ships driven by combustion engines (e.g. diesel engines) an improvement of efficiency and reduction of
emissions/pollution is desirable. Additionally, there are many regulations setting limit values for noise radiation in harbours and inshore. Further, even under changing conditions the cruise should be as pleasant as possible for passengers.
It is an objective of the present invention to solve or at least alleviate these problems. Thereto, the present
invention provides a method of optimising operation of a ship according to independent claim 1 and a corresponding system as well as a ship according to the remaining independent claims. Refinements and preferred embodiments of the present invention are subject to the dependent claims.
According to a first aspect of the present invention a method of optimising operation of a ship, comprises the following steps :
Simulating a current virtual behaviour of the ship with a digital twin of the ship and a model of a response of the environment of the ship based on a current real operation state of the ship.
Optimising the virtual behaviour of the ship regarding at least one predefined threshold with the digital twin and the model of the environment of the ship by
adjusting a virtual operation state of the ship.
Adjusting the real operation state of the ship according to the optimised virtual operation state of the ship.
According to a second aspect of the present invention a system for optimising operation of a ship is arranged and configured for executing the method according to the first aspect of the present invention. The system comprises a simulation module, an optimisation module and controls for the ship. The simulation module is arranged and configured for simulating a current virtual behaviour of the ship with a digital twin of the ship and a model of a response of the environment of the ship based on a current real operation state of the ship. The optimisation module is arranged and configured for optimising the virtual behaviour of the ship regarding at least one predefined threshold with the digital twin and the model of the environment of the ship by
adjusting a virtual operation state of the ship. The controls for the ship are arranged and configured for adjusting the real operation state of the ship according to the optimised virtual operation state of the ship.
According to a third aspect of the present invention a ship comprises the system according to the second aspect of the present invention.
The digital twin or virtual model of the ship produces a current virtual operation state of the ship based on the current real operation state of the ship (in the simulation module) . The current real operation state of the ship
comprises input variables relating to current properties of the ship like rotational speed of the engine (s), torque of the engine (s) and the like. These input variables describing the current operation state of the ship may be provided by a controller of the ship controlling operation of the ship and additionally or alternatively by sensors (also virtual sensors indirectly measuring the respective physical quantities based on a corresponding model) measuring the respective physical quantities. The digital twin may be based on Computational Fluid Dynamics (CFD) and/or lD-System- Modelling .
The model of the response of the environment of the ship simulates the reaction of the environment to the current virtual operation state of the ship and returns the resulting response of the environment (in the simulation module) . Based on the response an interaction between the ship in its current operation state and the environment is simulated.
With this interaction the virtual behaviour of the ship (e.g. noise radiation, speed, acceleration, exhaust emission, etc.) can be simulated based on the current operation state of the ship. The digital twin may be based on Computational Fluid Dynamics (CFD) and/or lD-System-Modelling .
The predefined threshold may be a regulation regarding maximal noise radiation in harbours or inshore and/or an upper limit for the acceleration/deceleration of the ship (e.g. deceleration during approaching a landing and docking) and/or an upper limit for exhaust emission and the like.
Based on the predefined threshold the virtual behaviour of the ship is optimised until the at least one predefined threshold is met. For example an upper limit for the noise radiation in a harbour has to be met, while at the same time a maximal possible acceleration should be maintained. This is a common optimisation problem that can be solved based on any known optimisation algorithm, wherein the virtual operation state of the ship is continuously altered and adjusted until an optimum for the given at least one predefined threshold is found (in the optimisation module) .
When the optimum for the given at least one predefined threshold is found, the virtual behaviour of the ship is optimal. Besides the optimal virtual behaviour of the ship the virtual operation state of the ship resulting in this optimal virtual behaviour of the ship is known. This optimal virtual operation state (in relation to the at least one threshold) is fed back to (the controls of) the ship such that the real operation state of the ship can be adjusted to meet the optimised virtual operation state of the ship. By adjusting the real operation state of the ship according to the adjusted operation state the behaviour of the ship can be optimised regarding the at least one
threshold and the at least one predefined threshold is optimally complied with.
Only if the simulation and the optimisation together are completed in less than a few minutes, the optimisation results (optimised virtual behaviour and corresponding optimised virtual operation state) can be reasonably applied to the ship.
With the method and system according to the present invention the behaviour of a ship can be optimised such that predefined thresholds can be optimally complied with.
According to a refinement of the present the current real operation state of the ship is fetched from at least one of controls for the ship and sensors (also virtual sensors) of the ship.
The current real operation state comprises input variables (rotational speed of engine (s), torque of engine (s), load, etc.) . These input variables are provided to the digital twin of the ship (in the simulation module) by the controls (e.g. a controller of the controls controlling the operation of the ship) and additionally or alternatively by the sensors measuring the respective quantities. The sensors may also be virtual sensors.
With a direct input of the current real operation state of the ship to the digital twin a very precise simulation result can be achieved. According to a refinement of the present invention the method further comprises the following initial steps:
Simulating a current interaction-free virtual behaviour of the ship with the digital twin of the ship based on the current real operation state of the ship.
Providing information about the current real behaviour of the ship.
Deriving at least a part of the model of the response of the environment of the ship by comparing the
interaction-free virtual behaviour of the ship with the current real behaviour of the ship.
According to a further refinement of the present invention the simulation module is further arranged and configured for simulating a current interaction-free virtual behaviour of the ship with the digital twin of the ship based on the current real operation state of the ship. The simulation module is further arranged and configured for deriving at least a part of the model of the response of the environment of the ship by comparing the interaction-free virtual
behaviour of the ship with a current real behaviour of the ship based on provided information about the current real behaviour of the ship.
The at least a part of the model of the response of the environment of the ship may not be known. For example, the response of a water body surrounding the ship to vibrations of the ship (for example caused by the engine (s) of the ship) cannot be simulated by a universally valid model. Far off shore where the depth of water is so large that the sea ground does not significantly contribute to the response a universally valid model of the water body can be assumed. However, in harbours or inshore the surrounding water body is greatly influenced by the sea ground, wharves and the like. Consequently, no universally valid model of the response of the environment (here of the surrounding water body) can be used for the simulation. The model of the response of the current environment has to be generated for the area where the ship is currently located.
Thereto, the current interaction-free virtual behaviour of the ship (behaviour as if no environment was present) is simulated with the digital twin of the ship (in the
simulation module) as described before. Additionally, the real current behaviour of the ship (e.g. noise radiation, exhaust emission, acceleration, etc.) is provided (for example by environmental (virtual) sensors of the ship) .
Based on the real current behaviour of the ship and the simulated interaction-free virtual behaviour of the ship the response of the environment can be derived. Based on the derived response of the environment at least a part of the model of the response of the environment can be generated. In other words, based on the "environment-free" behaviour and the real behaviour in the real environment the model of the environment or rather its response is derived.
The derived (part of the) model of the response of the environment can be utilised in the simulation of the virtual behaviour of the ship and the subsequent optimisation of the virtual behaviour of the ship.
With the derivation of at least a part of the model of the response of the environment highly precise simulation and optimisation of the virtual behaviour of the ship is
possible. Thus, the real behaviour of the ship can be
adjusted with high precision based on the simulation and optimisation results with the derived (part of the) model of the response of the environment even in shallow water like in harbours and inshore.
According to a refinement of the present invention the step of deriving at least a part of the model of the response of the environment of the ship is based on Computational Fluid Dynamics (CFD) . The (part of the) model of the response of the environment is derived from the interaction-free virtual behaviour of the ship and the provided current real behaviour of the ship based on CFD. The problem is solved with an approximation procedure (e.g. finite difference methods (FDM) , finite volume method (FVM) , finite element method (FEM) , spectral method, Lattice-Boltzmann method (LBM) , smoothed particle hydrodynamics (SPH) , boundary element method (BEM) , fast multipole method (FMM) , method of fundamental solutions
(MFS) , finite point method (FPM) (mesh-free) , moving particle semi-implicit method (MPS) , fast fluid dynamics (FFD) , particle in cell method (PIC) , vortex in cell method (VIC) or a combination thereof) in a mesh of virtual simulation nodes with a model like the Navier-Stokes-Equations , Euler- Equations, Laplace-Equations and the like.
With CFD a solution can be found in short time. Here, short time is in the range of seconds to five minutes. Only if the deriving of the (part of the) model of the response of the environment, the simulation and the optimisation together are completed in less than a few minutes, the optimisation results (optimised virtual behaviour and corresponding optimised virtual operation state) can be reasonably applied to the ship.
The utilisation of CFD for deriving the (part of the) model of the response of the environment provides for sufficiently precise and fast results.
According to a refinement of the present invention the model of the response of the environment of the ship is limited to the response of a water body surrounding the ship.
The interaction between the ship and the surrounding water- body is considerably stronger than the interaction between the ship and the remaining environment (e.g. air) .
Consequently, the remaining environment can be disregarded without significantly influencing the results of the simulation and optimisation while the time consumed for deriving, simulating and optimising is greatly reduced.
By only deriving the (part of the) model of the response of the water-body surrounding the ship a fast and yet
sufficiently precise simulation and optimisation of the behaviour of the ship can be achieved.
According to a refinement of the present invention the information about the current real behaviour of the ship is provided by at least one of sensors (also virtual sensors) of the ship, a navigation system of the ship, and an external data source.
The information about the current real behaviour of the ship (physical quantities like speed, acceleration, noise
radiation, exhaust emission etc. and also location or other information) may be provided by sensors of the ship
(accelerometer (in all three directions in space and all three angles), microphone, flow meter etc. and also by corresponding virtual sensors) . Also a navigation system may provide information about the current location, speed and acceleration of the ship. The external data source which may provide information about the current real behaviour of the ship may be a coast guard centre or the like.
The more information about the current real behaviour of the ship is provided, the more precise a (part of the) model of the response of the environment may be derived.
According to a refinement of the present invention at least a part of the model of the response of the environment of the ship is based at least on one of a sea chart of the
environment, information provided by the sensors (virtual sensors) of the ship and a ready-made model of the response of the environment for a certain region in the step of deriving . At least a part of the model of the response of the environment may not be derived from the interaction-free virtual behaviour of the ship and the current real behaviour of the ship but be based on other information sources. These other information sources can be a sea chart of the
environment (the area where the ship is currently located in) and/or sensors of the ship (sonar sensors, barometer,
hygrometer, etc. and also corresponding virtual sensors) and/or ready-made models of the response of the environment of the region or area where the ship is currently located in. The ready-made models of the response of the environment for certain regions (harbours, etc.) may be stored in a database on the ship or fetched from a central or decentralised database/repository (e.g. via the internet or a wireless wide area network (WWAN) like LTE, WiMAX, GSM, UMTS or other communication links) .
The simulation module, optimisation module and/or controls for the ship may be software modules running on a computer system of the ship or on a remote computer system like a computing centre. The simulation module, optimisation module and/or controls for the ship may alternatively be one or separate computers executing the corresponding steps of the method according to the present invention.
The present invention and its technical field are
subsequently explained in further detail by exemplary
embodiments shown in the drawings. The exemplary embodiments only conduce better understanding of the present invention and in no case are to be construed as limiting for the scope of the present invention. Particularly, it is possible to extract aspects of the subject-matter described in the figures and to combine it with other components and findings of the present description or figures, if not explicitly described differently. Equal reference signs refer to the same objects, such that explanations from other figures may be supplementally used. Fig. 1 shows a schematic flow chart of an embodiment of the method of optimising operation of a ship.
Fig. 2 shows a schematic view of an embodiment of the
system for optimising operation of a ship.
Fig. 3 shows a schematic view of an embodiment of the ship comprising the system for optimising operation of the ship.
In Fig. 1 a flow chart of an embodiment of the method of optimising operation of a ship is schematically depicted. In particular, the radiation of noise from the ship to the environment is optimised based on an upper limit for the noise radiation (e.g. regulation in a harbour) . The method comprises the steps of simulating 1 a current interaction- free virtual behaviour, providing 2 information about the current real behaviour, deriving 3, simulating 4 a current virtual behaviour, optimising 5 the virtual behaviour and adjusting 6 the real operation state.
The current interaction-free virtual behaviour of the ship is simulated with a digital twin or virtual model of the ship in the step of simulating 1. The digital twin may be based on Computational Fluid Dynamics (CFD) and/or lD-System- Modelling. The digital twin consumes input variables. The input variables are physical quantities describing the current real operation state of the ship. Here the current real operation state of the ship comprises a rotational speed of the engine of the ship and a mass flow rate of exhaust gas. The digital twin derives from these two input variables the virtual noise emission or rather virtual emitted
vibrations of the ship. As there is no interaction with the environment simulated (yet) this virtual noise emission forms the current interaction-free virtual behaviour of the ship.
Sensors (also virtual sensors indirectly measuring the respective physical quantities based on a corresponding model) of the ship provide information about the noise or rather vibrations actually emitted by the ship in the step of providing 2. This forms the information about the current real behaviour of the ship.
Based on the interaction-free virtual behaviour i.e. the behaviour without interaction with the environment and on the current real behaviour of the ship i.e. the behaviour with interaction with the environment the model of or at least a part of the model of the response of the environment is derived with Continuous Fluid Dynamics (CFD) in the step of deriving 3. The digital twin may be based on Computational Fluid Dynamics (CFD) and/or lD-System-Modelling . In other words, based on the virtual emission of vibrations without interaction with the environment and on the real emissions of vibrations (with interaction with the environment) the response of the environment (absorption, reflection and superposition of the vibrations) is derived and a
corresponding model of the response of the environment
(regarding vibrations/noise) is generated. The model of the response of the environment may be limited to the water body surrounding the ship.
However, any other physical quantity may be used to derive the (part of the) model of the response of the environment.
Also, other physical quantities describing the current real behaviour of the ship like a current speed and a current acceleration of the ship may be provided by a navigation system of the ship or an external source.
Further, at least a part of the model of the response of the environment may be based on a sea chart of the environment and/or on information provided by (virtual) sensors of the ship like sonar sensors providing a map of the sea ground and/or on a ready-made model of the response of the
environment for a certain region. The derived model of the response of the environment is used together or rather in combination with the digital twin of the ship to simulate the virtual behaviour of the ship (with interaction with the virtual environment) in the step of simulating 4. Thereby, the current real operation state of the ship described by the input variables (rotational speed of the engine of the ship and a mass flow rate of exhaust gas) as described above are consumed to simulate said virtual behaviour of the ship, here the noise radiation.
In the step of optimising 5 the virtual behaviour of the ship is optimised regarding the upper limit for noise radiation (predefined threshold) . In a common optimisation task the virtual operation state of the ship (rotational speed of the engine and flow rate of the exhaust gas) is iteratively adjusted until the virtual noise radiation (virtual behaviour of the ship) meets the upper limit for noise radiation.
As soon as the virtual behaviour is optimised and the
corresponding optimised virtual operation state is found, the real operation state is adjusted according to the optimised virtual operation state in the step of adjusting 6. Here the rotational speed of the engine and the flow rate of exhaust gas are adjusted to the optimised virtual (simulated) rotational speed of the engine and the optimised virtual (simulated) flow rate of exhaust.
Thus, based on the simulation with the derived model of the response of the environment and the digital twin of the ship the operation state of the ship is optimised regarding the upper limit for noise radiation.
In Fig. 2 a view of an embodiment of the system 10 for optimising operation of a ship is schematically depicted. The system 10 is arranged and configured to execute the method of Fig.l. The system 10 comprises a simulation module 11, an optimisation module 12 and controls 21 for the ship. The simulation module 11 is a computer program executed on a computer system of the ship. The simulation module 11 is arranged and configured to execute the steps of simulating 1, deriving 3 and simulating 4 as described above. The
simulation module receives the current real operation state of the ship (rotational speed of the engine and flow rate of exhaust) by the controls 21 and (virtual) sensors (flow rate sensor) 22 of the ship. Further, the simulation module receives information about the current real behaviour of the ship from the (virtual) sensors (microphones) 22.
Additionally, a current speed and acceleration of the ship may be provided to the simulation module 11 by a navigation system 23 of the ship and/or an external source 40 via a communication link like a WWAN. Further, at least a part of the model of the response of the environment derived by the simulation module 11 may be based on a sea chart of the environment that is stored in a database on the ship or fetched from a remote database 41 via a communication link and/or on information provided by the (virtual) sensors of the ship like sonar sensors 22 providing a map of the sea ground and/or on a ready-made model of the response of the environment for a certain region that is stored in a database on the ship or fetched from the remote database 41 via the communication link (e.g. WWAN) .
The optimisation module 12 is a computer program executed on a computer system of the ship. The optimisation module 12 is arranged and configured to execute the step of optimising 5 as described above.
The controls 21 for the ship are a computer program executed on a controller (computer) of the ship. The controls 21 are arranged and configured to execute the steps of adjusting 6 as described above. The controls 21 provide the current operation state of the ship to the simulation module 11 and adjust the operation state (rotational speed of the engine and the flow rate of exhaust) of the ship according to the optimised virtual operation state provided by the simulation module 11.
In Fig. 3 a view of an embodiment of the ship 20 comprising the system 10 for optimising operation of a ship is
schematically depicted. The ship 20 comprises the system of Fig. 2, controls 21, (virtual) sensors 22 and a navigation system 23 as described above. The ship 20 is surrounded by a water body 30 interacting with the ship 20. The water body 30 produces a response to the current real operation state of the ship 20 leading to a current real behaviour of the ship 20. Here, the water body 30 absorbs and reflects vibrations (noise) emitted by the ship 20. The emitted and reflected vibrations are superimposed and form the noise emission
(current real behaviour) of the ship. With the simulation module 11 and optimisation module 12 running on a computer of the ship 20 and based on the information provided by the controls 21 and/or the (virtual) sensors 22 and/or the navigation system 23 and or the external data source 40 and/or the database 41 the model of the response of the water body 30 is derived (simulation module 11) and the current operation state of the ship 20 is optimally adjusted
according to the optimised virtual operation state of the ship 20 (provided by the simulation module 12 and the
optimisation module 12) by the controls 21 as described above .
Like described for noise emission the real operation state of the ship 20 may additionally or alternatively be optimally adjusted regarding an acceleration and/or deceleration of the ship 20 during departure and/or docking. Thereby, upper limits for the acceleration/deceleration (predefined
thresholds) are complied with in order to optimise the comfort of the cruise for passengers on the ship 20 by adjusting the real operation state of the ship 20 according to the optimised virtual operation state of the ship 20 simulated and optimised as described above. Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or
equivalent implementations exist. It should be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration in any way. Rather, the foregoing summary and detailed description will provide those skilled in the art with a convenient road map for
implementing at least one exemplary embodiment, it being understood that various changes may be made in the function and arrangement of elements described in an exemplary
embodiment without departing from the scope as set forth in the appended claims and their legal equivalents. Generally, this application is intended to cover any adaptations or variations of the specific embodiments discussed herein.
In the foregoing detailed description, various features are grouped together in one or more examples for the purpose of streamlining the disclosure. It is understood that the above description is intended to be illustrative, and not
restrictive. It is intended to cover all alternatives, modifications and equivalents as may be included within the scope of the invention. Many other examples will be apparent to one skilled in the art upon reviewing the above
specification .
Specific nomenclature used in the foregoing specification is used to provide a thorough understanding of the invention. However, it will be apparent to one skilled in the art in light of the specification provided herein that the specific details are not required in order to practice the invention. Thus, the foregoing descriptions of specific embodiments of the present invention are presented for purposes of
illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed; obviously many modifications and variations are possible in view of the above teachings. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best utilize the
invention and various embodiments with various modifications as are suited to the particular use contemplated. Throughout the specification, the terms "including" and "in which" are used as the plain-English equivalents of the respective terms "comprising" and "wherein," respectively. Moreover, the terms "first," "second," and "third," etc., are used merely as labels, and are not intended to impose numerical requirements on or to establish a certain ranking of importance of their objects. In the context of the present description and claims the conjunction "or" is to be understood as including
("and/or") and not exclusive ("either ... or") .

Claims

Patent claims
1. Method of optimising operation of a ship (20), comprising the steps of:
simulating (4) a current virtual behaviour of the ship (20) with a digital twin of the ship (20) and a model of a response of the environment (30) of the ship (20) based on a current real operation state of the ship (20) ;
optimising (5) the virtual behaviour of the ship (20) regarding at least one predefined threshold with the digital twin and the model of the environment (30) of the ship (20) by adjusting a virtual operation state of the ship (20) ;
adjusting (6) the real operation state of the ship (20) according to the optimised virtual operation state of the ship (20) .
2. Method according to any preceding claim, wherein the
current real operation state of the ship (20) is fetched from at least one of:
controls (21) for the ship (20); and
sensors (22) of the ship (20) .
3. Method according to claim 1 or 2, further comprising the initial steps of:
simulating (1) a current interaction-free virtual behaviour of the ship (20) with the digital twin of the ship (20) based on the current real operation state of the ship (20);
providing (2) information about the current real behaviour of the ship (20);
deriving (3) at least a part of the model of the response of the environment (30) of the ship (20) by comparing the interaction-free virtual behaviour of the ship (20) with the current real behaviour of the ship (20) .
4. Method according to claim 3, wherein the step of deriving (3) at least a part of the model of the response of the environment (30) of the ship (20) is based on
Computational Fluid Dynamics, CFD.
5. Method according to claim 3 or 4, wherein the model of the response of the environment (30) of the ship (20) is limited to the response of a water body (30) surrounding the ship (20) .
6. Method according to any of claims 3 to 5, wherein the information about the current real behaviour of the ship (20) is provided by at least one of:
sensors (22) of the ship (20);
a navigation system (23) of the ship (20); and an external data source (40) .
7. Method according to any of claims 3 to 6, wherein in the step of deriving (3) at least a part of the model of the response of the environment (30) of the ship (20) is based at least on one of:
a sea chart of the environment (30);
information provided by the sensors (22) of the ship (20) ; and
a ready-made model of the response of the environment (30) for a certain region.
8. System (10) for optimising operation of a ship (20)
arranged and configured for executing the method
according to claim 1 or 2, comprising:
a simulation module (11) arranged and configured for simulating (4) a current virtual behaviour of the ship (20) with a digital twin of the ship (20) and a model of a response of the environment (30) of the ship (20) based on a current real operation state of the ship (20) ;
an optimisation module (12) arranged and configured for optimising (5) the virtual behaviour of the ship (20) regarding at least one predefined threshold with the digital twin and the model of the environment (30) of the ship (20) by adjusting a virtual operation state of the ship (20);
controls (21) for the ship (20) arranged and configured for adjusting (6) the real operation state of the ship (20) according to the optimised virtual operation state of the ship (20) .
9. System (10) according to claim 8 arranged and configured for executing the method according to claim 3, wherein the simulation module (11) is further arranged and configured for simulating (1) a current interaction-free virtual behaviour of the ship (20) with the digital twin of the ship (20) based on the current real operation state of the ship (20) as well as for deriving (3) at least a part of the model of the response of the
environment (30) of the ship (20) by comparing the interaction-free virtual behaviour of the ship (20) with a current real behaviour of the ship (20) based on provided information about the current real behaviour of the ship (20) .
10. System (10) according to claim 9, further arranged and configured for executing the method according to any of claims 4 to 7.
11. Ship (20) comprising a system (10) according to any of claims 8 to 11.
PCT/EP2019/052655 2019-02-04 2019-02-04 Optimising ship noise radiation using digital twins and controls WO2020160749A1 (en)

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