Calculation method of state parameters of integrated motor propulsion device

Abstract

The present invention provides a method for calculating state parameters of an integrated motor propulsion device, the method comprising: obtaining a calculated rotational speed; inputting the calculated rotational speed into a first simulation model to obtain a first torque, a second torque, and fluid pressure information output by the first simulation model; determining a third torque based on the fluid pressure information; determining a fourth torque based on the calculated rotational speed, the first torque, the second torque, and the third torque; and determining the state parameters of the integrated motor propulsion device in a rotational state based on the calculated rotational speed, the first torque, the second torque, the third torque, and the fourth torque. This method reduces the difficulty and complexity of calculating the state parameters in the rotational state by combining simulation calculations with other calculation methods in different regions, improves the calculation accuracy, and helps to improve the accuracy of the structural design of the ship's launching and retracting mechanism and the analysis of the hull's navigation characteristics.

Description

Technical Field

[0001] The present invention relates to the technical field of ship equipment, and in particular to a method for calculating state parameters of an integrated motor propulsion device. Background Art

[0002] With the development of science and technology, the traditional propeller driven by the drive shaft on the ship has been replaced by the compact integrated motor propulsion device. The integrated motor propulsion device is used for auxiliary propulsion and has the characteristics of intermittent operation. By configuring the corresponding retraction and deployment mechanism, it can be retracted into the ship after stopping work, reducing the resistance of the appendage. When the integrated motor propulsion device is deployed overboard through the retraction and deployment mechanism and has not yet been started, or when the integrated motor propulsion device completely stops working and has not yet been retracted, due to the impact of the incoming flow brought by the hull's navigation, the integrated motor propulsion device will exist as an appendage resistance component. Seawater or river water with a certain incoming flow velocity will flow through the flow channel of the integrated motor propulsion device, forming a certain flow rate. For the integrated motor propulsion device without a drive shaft, the flow of seawater or river water will drive the impeller to rotate under certain circumstances, which is called the rotation state of the integrated motor propulsion device.

[0003] The stress conditions of the integrated motor propulsion device in the rotational state are complex. Accurate evaluation of various parameters of the integrated motor propulsion device in the rotational state is of great significance for the structural design of the retracting and launching mechanism and the analysis of the hull navigation characteristics.

[0004] The rotating parts of the integrated motor propulsion device are subject to complex forces, which require an integrated analysis model of multiple disciplines and multiple physical fields such as flow pressure, flow friction, and bearing force to solve. The model is complex and difficult to solve, making it impractical. At the same time, the structure of the rotating parts of the integrated motor propulsion device is complex, and the geometric scales of the main flow channel and the gap flow channel vary greatly. When conducting an overall simulation analysis, not only is the calculation complexity and difficulty high, but the calculation accuracy is also low. Summary of the Invention

[0005] The present invention provides a method for calculating state parameters of an integrated motor propulsion device, which is used to solve the problems in the prior art of complex, difficult and low-accuracy calculation of the rotational state parameters of the integrated motor propulsion device.

[0006] The present invention provides a method for calculating state parameters of an integrated motor propulsion device, comprising:

[0007] Obtaining a calculated rotational speed, the calculated rotational speed being used to characterize the rotational speed of the rotating component of the integrated motor propulsion device in a follow-up state;

[0008] Inputting the calculated rotational speed into a first simulation model to obtain first torque, second torque, and fluid pressure information output by the first simulation model, wherein the first torque is used to characterize the rotational torque and axial thrust generated by the blade portion of the rotating assembly in a rotating state, the second torque is used to characterize the rotational torque and axial thrust generated by the connector portion of the rotating assembly in a rotating state, and the fluid pressure information is used to characterize the fluid pressure distribution within the rotating assembly in the rotating state, and the first simulation model is obtained by performing fluid mechanics simulation based on geometric parameters of the blade portion and the connector portion;

[0009] determining a third torque based on the fluid pressure information, wherein the third torque is used to characterize the rotational torque and axial thrust generated by the gap portion of the rotating component in a rotating state;

[0010] determining a fourth moment based on the calculated rotational speed, the first moment, the second moment, and the third moment, the fourth moment being used to characterize the rotational torque and axial thrust generated by the bearing assembly of the rotating assembly in a rotating state;

[0011] Based on the calculated rotational speed, the first torque, the second torque, the third torque, and the fourth torque, state parameters of the integrated electric motor propulsion device in a follow-up state are determined.

[0012] According to a method for calculating state parameters of an integrated motor propulsion device provided by the present invention, determining the third torque based on the fluid pressure information includes:

[0013] Determining inlet and outlet pressure values ​​of the gap portion based on the fluid pressure information;

[0014] The third torque is determined based on the inlet and outlet pressure values.

[0015] According to a method for calculating state parameters of an integrated motor propulsion device provided by the present invention, determining the third torque based on the inlet and outlet pressure values ​​includes:

[0016] The inlet and outlet pressure values ​​are input into a second simulation model to obtain the third torque output by the second simulation model, which is obtained by performing fluid mechanics simulation based on the geometric parameters of the gap portion.

[0017] According to a method for calculating state parameters of an integrated motor propulsion device provided by the present invention, determining a fourth torque based on the calculated rotational speed, the first torque, the second torque, and the third torque includes:

[0018] determining the axial thrust of the fourth moment based on the axial thrust of the first moment, the second moment, and the third moment according to moment balance;

[0019] Based on the calculated rotational speed and characteristic parameters of the bearing assembly, a rotational torque of the fourth moment is determined.

[0020] According to a method for calculating state parameters of an integrated motor propulsion device provided by the present invention, obtaining and calculating the rotation speed includes:

[0021] Obtaining a calculated incoming flow velocity, where the calculated incoming flow velocity is used to characterize an incoming flow velocity corresponding to a medium environment in which the integrated motor propulsion device is located;

[0022] Based on the calculated incoming flow velocity, the calculated rotational velocity is determined.

[0023] According to a method for calculating state parameters of an integrated motor propulsion device provided by the present invention, determining the state parameters of the integrated motor propulsion device in a follow-up state based on the calculated rotational speed, the first torque, the second torque, the third torque, and the fourth torque includes:

[0024] Obtaining a first simulation curve showing how the rotational torque of the first torque varies with the calculated rotational speed, and obtaining a second simulation curve showing how the target rotational torque varies with the calculated rotational speed, the target rotational torque being used to represent the sum of the rotational torques of the second torque, the third torque, and the fourth torque;

[0025] determining the calculated rotational speed at the intersection of the first simulation curve and the second simulation curve as a target rotational speed;

[0026] The state parameter is determined based on the first torque, the second torque, the third torque, and the fourth torque corresponding to the target rotation speed.

[0027] The present invention further provides a device for calculating state parameters of an integrated motor propulsion device, comprising:

[0028] an acquisition unit, configured to acquire a calculated rotational speed, wherein the calculated rotational speed is used to characterize the rotational speed of the rotating component of the integrated motor propulsion device in a follow-up rotation state;

[0029] a first processing unit, configured to input the calculated rotational speed into a first simulation model to obtain first torque, second torque, and fluid pressure information output by the first simulation model, wherein the first torque is used to characterize the rotational torque and axial thrust generated by the blade portion of the rotating assembly in a rotating state, the second torque is used to characterize the rotational torque and axial thrust generated by the connector portion of the rotating assembly in a rotating state, and the fluid pressure information is used to characterize the fluid pressure distribution within the rotating assembly in the rotating state, wherein the first simulation model is obtained by performing fluid mechanics simulation based on geometric parameters of the blade portion and the connector portion;

[0030] a second processing unit, configured to determine a third torque based on the fluid pressure information, wherein the third torque is configured to characterize a rotational torque and an axial thrust generated by a gap portion of the rotating assembly in a follow-rotation state;

[0031] a third processing unit, configured to determine a fourth torque based on the calculated rotational speed, the first torque, the second torque, and the third torque, wherein the fourth torque is used to characterize the rotational torque and axial thrust generated by the bearing assembly of the rotating assembly in a follow-rotation state;

[0032] The fourth processing unit is used to determine the state parameters of the integrated motor propulsion device in the follow-up state based on the calculated rotation speed, the first torque, the second torque, the third torque and the fourth torque.

[0033] The present invention also provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a method for calculating the state parameters of the integrated motor propulsion device as described in any one of the above-mentioned methods is implemented.

[0034] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for calculating state parameters of an integrated motor propulsion device as described in any one of the above.

[0035] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements a method for calculating state parameters of any of the above-described integrated motor propulsion devices.

[0036] The method for calculating the state parameters of the integrated motor propulsion device provided by the present invention reduces the difficulty and complexity of calculating the state parameters of the integrated motor propulsion device in the rotational state by combining simulation calculations in different regions with other calculation methods, improves the calculation accuracy, and helps to improve the accuracy of the structural design of the ship's launching and retracting mechanism and the analysis of the hull's navigation characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is one of the flow charts of the method for calculating the state parameters of the integrated motor propulsion device provided by the present invention;

[0039] Figure 2 This is the second flow chart of the method for calculating the state parameters of the integrated motor propulsion device provided by the present invention;

[0040] Figure 3 Schematic diagram of the relationship between the first simulation curve and the second simulation curve provided by the present invention;

[0041] Figure 4 1 is a schematic structural diagram of a device for calculating state parameters of an integrated motor propulsion device provided by the present invention;

[0042] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] In the description of the embodiments of the present invention, it should be noted that the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0045] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0046] The integrated motor propulsion device is a new type of propulsion method that integrates the propulsion motor and the rotating component. The propulsion motor drives the rotating component, and the rotating component rotates to generate thrust to propel the hull to sail.

[0047] When the integrated motor propulsion device is released overboard through the retraction mechanism and has not yet been started, or the integrated motor propulsion device has completely stopped working and has not yet been retracted, due to the impact of the incoming flow brought by the hull's navigation, the integrated motor propulsion device will exist as an attached resistance component, and seawater or river water with a certain incoming flow velocity will flow through the flow channel of the integrated motor propulsion device, forming a certain flow rate. For an integrated motor propulsion device without a drive shaft, the above flow will drive the impeller to rotate under certain circumstances, which is called the follow-up rotation state of the integrated motor propulsion device.

[0048] The following combination Figures 1 to 3 A method for calculating state parameters of an integrated motor propulsion device according to an embodiment of the present invention is described.

[0049] like Figure 1 As shown, the method for calculating the state parameters of the integrated motor propulsion device according to an embodiment of the present invention includes steps 110 to 150.

[0050] Step 110: Obtain and calculate the rotation speed.

[0051] The calculated rotational speed is used to characterize the rotational speed of the rotating component of the integrated motor propulsion device in a rotational state.

[0052] In this step, the calculated rotational speed is the rotational speed of the rotating component of the integrated motor propulsion device in a rotation state assuming that the integrated motor propulsion device is not working.

[0053] In actual implementation, multiple calculated rotation speeds can be set according to the common working conditions of the hull to perform simulation calculations of the state parameters of the integrated motor propulsion device. Two calculated rotation speeds can be set for the first calculation, and then other calculated rotation speeds can be set based on subsequent calculation results.

[0054] For example, the calculated rotational speed may be 3% of the rated rotational speed and 10% of the rated rotational speed of the rotating assembly of the integrated electric motor propulsion device.

[0055] Step 120: Input the calculated rotational speed into the first simulation model to obtain first torque, second torque and fluid pressure information output by the first simulation model.

[0056] The first torque is used to characterize the rotational torque and axial thrust generated by the blade part of the rotating component in the follow-rotation state. The second torque is used to characterize the rotational torque and axial thrust generated by the connecting part of the rotating component in the follow-rotation state. The fluid pressure information is used to characterize the fluid pressure distribution in the rotating component in the follow-rotation state.

[0057] In this embodiment, the rotating assembly includes a blade part and a connecting part, the connecting part is used to install the blade part inside the integrated motor propulsion device, the connecting part includes a hub for installing the blade part on the shaft, and a blade connecting part for connecting the individual blades of the blade part together.

[0058] When the integrated motor propulsion device is in a follow-rotating state, the fluid force generated by fluids such as sea water or river water on the blade part has a rotational speed in the blade part of the rotating component, and the blade part forms a certain rotational torque T2 and axial thrust N2, which is the first torque. The first torque directly acts on the surface of the blade part.

[0059] When the integrated motor propulsion device is in a follow-up state, the fluid force generated by sea water or river water on the surface of the connecting parts such as the hub and blade connecting parts is mainly friction.

[0060] The blade part of the rotating assembly has a rotational speed, and the hub forms a certain rotational torque T3 and axial thrust N3, which directly act on the hub surface; correspondingly, the blade connector forms a certain rotational torque T4 and axial thrust N4, which directly act on the blade connector surface.

[0061] The second torque includes the rotational torque T3 and the axial thrust N3 as well as the rotational torque T4 and the axial thrust N4.

[0062] In this embodiment, the first simulation model is obtained by performing fluid mechanics simulation based on geometric parameters of the blade part and the connector part.

[0063] The first simulation model was established, with the hull surface near the integrated motor propulsion device, the flow space near the integrated motor propulsion device, the duct geometry of the integrated motor propulsion device, the main flow channel formed by the blade part and the connector part, and the geometry of the blade part and the connector part as the calculation domain, and flow simulation was carried out based on fluid mechanics.

[0064] In actual implementation, three-dimensional computational fluid dynamics can be used to carry out flow simulation. For example, a RANS method can be used to establish a first simulation model using a turbulence model such as SST or k-ε.

[0065] Through the three-dimensional simulation analysis of the first simulation model, the rotational torques T2, T3, T4 and the axial thrusts N2, N3, N4 generated in the main channel of the integrated motor propulsion device can be obtained.

[0066] Step 130: Determine a third torque based on the fluid pressure information.

[0067] The third torque is used to characterize the rotational torque and axial thrust generated by the gap part of the rotating component in the rotating state.

[0068] It is understandable that the rotating assembly needs to maintain a certain gap with other components to ensure the installation and rotation of the rotating assembly. The gap part of the rotating assembly has a complex structure, and its geometric scale is quite different from the geometric scale of the main channel.

[0069] In this embodiment, the gap portion of the rotating assembly includes a rim air gap between the blade connector and the housing of the integrated motor propulsion device. In actual implementation, the rim of the blade connector of the integrated motor propulsion device is installed with the motor rotor, and the gap between the motor rotor and the corresponding motor stator is the rim air gap.

[0070] When the integrated motor propulsion device is in the follow-rotation state, the blade part of the rotating component has a rotation speed, and a certain rotational torque T5 and axial thrust N5 are formed at the wheel rim air gap, which directly act on the wheel rim air gap surface.

[0071] The gap part of the rotating component can also include the hub gap at the hub. When the integrated motor propulsion device is in the follow-rotation state, the blade part of the rotating component has a rotation speed, and a certain rotational torque T6 and axial thrust N6 are formed at the hub gap, which directly act on the hub gap.

[0072] In this embodiment, the third torque includes the rotational torque T5 and the axial thrust N5 as well as the rotational torque T6 and the axial thrust N6.

[0073] The third moment is the force generated by the gap flow, which is related to the fluid pressure at the gap. It can be obtained through computational fluid dynamics simulation or evaluated and calculated using relevant empirical formulas.

[0074] In actual implementation, due to the small flow rate in the hub clearance, small diameter, small rotational tangential speed, and small values ​​of the torque T6 and axial thrust N6, they can usually be ignored or set to a preset constant value.

[0075] Step 140: Determine a fourth torque based on the calculated rotational speed, the first torque, the second torque, and the third torque.

[0076] The fourth torque is used to characterize the rotational torque and axial thrust generated by the bearing assembly of the rotating assembly in the follow-rotation state.

[0077] The bearing assembly is an important component in the integrated motor propulsion device. Its function is to support the rotating assembly, reduce the friction coefficient of the rotating assembly during movement, and ensure the rotation accuracy of the rotating assembly.

[0078] When the integrated motor propulsion device is in a follow-rotating state, the blade part of the rotating assembly has a rotational speed, the fluid force generated by sea water or river water directly acts on the bearing assembly, and the bearing assembly is also affected by the force of the rotating assembly.

[0079] In this step, a force analysis is performed based on the calculated rotational speed, the first moment, the second moment, and the third moment, and the rotational torque T7 and the axial thrust N7 generated by the bearing assembly are obtained in combination with the geometric parameters of the bearing assembly itself.

[0080] Step 150: Determine state parameters of the integrated motor propulsion device in a follow-up state based on the calculated rotational speed, the first torque, the second torque, the third torque, and the fourth torque.

[0081] According to the set calculated rotation speed, the first torque, second torque, third torque and fourth torque of the integrated motor propulsion device in the rotation state are calculated, and then the force condition, rotation condition and flow condition that characterize the rotation state of the integrated motor propulsion device are obtained.

[0082] In this embodiment, based on the calculated rotational speed and the first torque, second torque, third torque and fourth torque calculated from the calculated rotational speed, state parameters such as the resistance of the integrated motor propulsion device, the rotational speed of the rotating component, the main flow channel flow, the gap flow channel flow, the axial thrust and rotational torque of the rotating component can be obtained.

[0083] In actual implementation, multiple calculated rotation speeds can be set, and the first torque, second torque, third torque and fourth torque corresponding to each calculated rotation speed can be calculated respectively. According to the obtained data set, the data set is subjected to data fitting, parameter estimation, interpolation and other data processing to obtain the state parameters of the integrated motor propulsion device with rotation state at different rotation speeds.

[0084] In an embodiment of the present invention, the force analysis of the integrated motor propulsion device is divided according to components, and a simulation model is used to perform simulation calculations on the main flow channel composed of the blade part and the connecting part, and the force conditions of the gap flow channel and the bearing assembly are determined using the results of the simulation calculations. This can effectively reduce the difficulty and complexity of calculating the state parameters and improve the calculation accuracy.

[0085] According to the method for calculating the state parameters of the integrated motor propulsion device provided by an embodiment of the present invention, the difficulty and complexity of calculating the state parameters of the integrated motor propulsion device in the rotational state are reduced by combining simulation calculations in different regions with other calculation methods, and the calculation accuracy is improved, which helps to improve the accuracy of the structural design of the ship's launching and retracting mechanism and the analysis of the hull's navigation characteristics.

[0086] In some embodiments, step 130 includes:

[0087] Based on the fluid pressure information, determining the inlet and outlet pressure values ​​of the gap portion;

[0088] Based on the inlet and outlet pressure values, the third torque is determined.

[0089] In this embodiment, based on the fluid pressure information characterizing the fluid pressure distribution within the rotating component obtained by fluid mechanics simulation calculation, the inlet and outlet pressure values ​​of the gap part are determined, including the inlet and outlet pressure values ​​of the rim air gap and the inlet and outlet pressure values ​​of the hub gap, and the third torque is determined based on the inlet and outlet pressure values.

[0090] In actual implementation, the third torque can be obtained through theoretical calculation based on the geometric parameters of the gap part, the calculated rotation speed, the inlet and outlet pressure values ​​of each gap and other data, or by establishing a simulation model.

[0091] In some embodiments, the inlet and outlet pressure values ​​are input into the second simulation model to obtain a third torque output by the second simulation model.

[0092] The second simulation model is obtained by performing fluid mechanics simulation based on geometric parameters of the gap portion.

[0093] In actual implementation, simulation models of the rim air gap and hub clearance can be established separately, and three-dimensional simulation calculations can be performed using the corresponding inlet and outlet pressure values ​​as boundary conditions.

[0094] In this embodiment, the second simulation model can use the inlet and outlet pressure values ​​as boundary conditions, use the RANS method, and adopt turbulence models such as SST or k-ε to carry out three-dimensional simulation analysis and calculation to determine the torque T5 and axial thrust N5 as well as the torque T6 and axial thrust N6.

[0095] It should be noted that the internal geometric structure of the rim air gap and the hub gap is complex. Establishing a corresponding simulation model can improve the accuracy of the third torque calculation.

[0096] It can be understood that in some embodiments, the calculation of the third torque can also include the geometric flow path of the rim air gap and the hub gap into the simulation domain in the first simulation model to calculate the turning torque T5 and the axial thrust N5 as well as the turning torque T6 and the axial thrust N6. Since the geometric scale of the rim air gap and the hub gap is quite different from the geometric scale of the main flow path, the joint simulation will significantly increase the amount of calculation, but good simulation results will help to improve the prediction accuracy of T5, T6, N5, and N6.

[0097] In some embodiments, step 140 includes:

[0098] determining an axial thrust of a fourth moment based on the axial thrusts of the first moment, the second moment, and the third moment according to moment balance;

[0099] Based on the calculated rotational speed and characteristic parameters of the bearing assembly, a rotational torque of the fourth moment is determined.

[0100] The rotational torque and axial thrust received by the integrated motor propulsion device during the rotation process include the rotational torque T1, the first torque, the second torque, the third torque and the fourth torque generated by the motor rotor due to electromagnetic action, that is, the above-mentioned rotational torques T2 to T7 and the corresponding axial thrusts N2 to N7.

[0101] It can be understood that when the integrated motor propulsion device is in a working point of follow-rotation or active rotation, all the above-mentioned rotational torques and the axis thrust are in a state of equilibrium, as shown in the following formula:

[0102] N2+N3+N4+N5+N6+N7=0

[0103] T1+T2+T3+T4+T5+T6+T7=0

[0104] Among them, when the integrated motor propulsion device is in the follow-up state, the integrated motor propulsion device does not work, T1=0.

[0105] In this embodiment, the axial thrust of the fourth moment is determined based on the axial thrusts of the first moment, the second moment, and the third moment according to the moment balance of the axial thrust.

[0106] In actual implementation, N7 = -(N2 + N3 + N4 + N5 + N6).

[0107] With respect to the rotational torque, the rotational torque of the fourth moment is obtained through force analysis by combining the calculated rotational speed and characteristic parameters of the bearing assembly.

[0108] In this embodiment, the bearing assembly may include a thrust bearing and a bearing assembly.

[0109] Combined with the calculated rotational speed and the characteristic parameters of the thrust bearing, the rotational torque formed by the thrust bearing assembly is obtained through the thrust bearing force analysis; the radial support bearing is affected by the gravity of the rotating parts of the integrated motor propulsion device. Combined with the calculated rotational speed and the characteristic parameters of the radial support bearing, the rotational torque formed by the radial support bearing assembly is obtained through the force analysis.

[0110] By combining the rotational torque generated by the thrust bearing assembly and the rotational torque generated by the radial support bearing assembly, a fourth torque, ie, the rotational torque T7 generated by the bearing assembly, can be obtained.

[0111] It should be noted that the integrated motor propulsion device is in an inclined state, and the normal force acting on the contact surface of the thrust bearing and the radial support bearing includes an axial thrust component and a gravity component. At this time, the torque T7 generated by the bearing assembly is calculated based on the axial thrust, gravity, calculated rotation speed, and characteristic parameters of the bearing assembly.

[0112] In some embodiments, step 110 includes:

[0113] Obtaining a calculated incoming flow velocity, where the calculated incoming flow velocity is used to characterize the incoming flow velocity corresponding to the medium environment in which the integrated motor propulsion device is located;

[0114] Based on the calculated incoming flow velocity, the calculated rotational velocity is determined.

[0115] It can be understood that the reason why the integrated motor propulsion device rotates is the incoming flow velocity of the medium environment in which the integrated motor propulsion device is located, that is, the sailing speed of the hull when the integrated motor propulsion device is not working.

[0116] In this embodiment, a plurality of calculated rotational speeds may be set according to the incoming flow speed, and the state parameters of the rotational state of the integrated motor propulsion device may be solved at the plurality of calculated rotational speeds.

[0117] It should be noted that multiple calculated rotation speeds can be set evenly. For example, the possible rotation speed of the integrated motor propulsion device in the rotation state is 10r / min to 50r / min, and the calculated rotation speed can be set to 10r / min, 20r / min, 30r / min, 40r / min and 50r / min.

[0118] In some embodiments, step 150 includes:

[0119] Obtaining a first simulation curve showing how the rotational torque of the first torque varies with the calculated rotational speed, and obtaining a second simulation curve showing how the target rotational torque varies with the calculated rotational speed, wherein the target rotational torque is used to represent the sum of the rotational torques of the second torque, the third torque, and the fourth torque;

[0120] determining a calculated rotational speed at an intersection of the first simulation curve and the second simulation curve as a target rotational speed;

[0121] State parameters of the integrated motor propulsion device are determined based on the first torque, the second torque, the third torque, and the fourth torque corresponding to the target rotational speed.

[0122] It can be understood that the first torque is the direct effect of the incoming flow impact and is an active rotational torque. The second, third and fourth torques are all torques mainly caused by friction and are friction resistance rotational torques.

[0123] In this embodiment, multiple calculated rotational speeds can be set according to the incoming flow velocity, and the corresponding first to fourth torques can be calculated, wherein the active rotational torque and the rotational speed are approximately linear within a certain range, and a first simulation curve of the active rotational torque and the calculated rotational speed can be obtained.

[0124] Correspondingly, the resistance torque is also approximately linear with the rotational speed within a certain range. In actual implementation, the inverse of the sum of the second torque, the third torque and the fourth torque can be used as the vertical coordinate, and the second simulation curve of the friction resistance torque and the calculated rotational speed can be plotted in the coordinate graph where the first simulation curve is located.

[0125] like Figure 3 As shown, the first simulation curve of the active torque changing with the calculated rotational speed and the second simulation curve of the resistance torque changing with the calculated rotational speed have an intersection point, and the calculated rotational speed at the intersection point is determined as the target rotational speed. The target rotational speed characterizes the actual operating state under a given incoming flow velocity. The target rotational speed is used as the rotational speed of the rotating component in the state parameter of the rotational state, and the first torque, second torque, third torque and fourth torque corresponding to the target rotational speed are used to calculate the remaining state parameters such as the resistance of the integrated motor propulsion device, the main channel flow rate, the gap channel flow rate, the axial thrust and torque of the rotating component.

[0126] It can be understood that the first simulation curve and the second simulation curve are fitted curves, and the target rotation speed at the intersection of the first simulation curve and the second simulation curve may not be the calculated rotation speed set in step 110. At this time, it is necessary to re-determine the first torque, second torque, third torque and fourth torque corresponding to the target rotation speed according to the calculation method of the state parameters of the above-mentioned integrated motor propulsion device.

[0127] A specific embodiment is described below.

[0128] like Figure 2 As shown, step 210 is to set the calculation rotation speed point, that is, to set a plurality of calculation rotation speeds according to the incoming flow speed.

[0129] Step 220 : Calculate the force on the main channel, perform simulation calculation based on the calculated rotation speed, and obtain the first torque, the second torque, and fluid pressure information.

[0130] Step 230: Calculate the gap force based on the fluid pressure information, and calculate the third moment based on an empirical formula or by establishing a simulation model.

[0131] Step 240: Calculate the force on the bearing assembly, and determine the fourth moment of the bearing assembly through force analysis.

[0132] Step 250 : draw a graph showing the relationship between the active rotational torque, the resistance rotational torque and the rotational speed, that is, draw a first simulation curve and a second simulation curve in the same graph.

[0133] Step 260 : Determine whether the calculated rotation speed point set in step 210 is sufficient based on the data of the rotation speed calculated near the intersection of the first simulation curve and the second simulation curve.

[0134] In this step, if the number of calculation points near the intersection of the two curves is sufficient to support the determination of the specific value of the intersection point, the loop is stopped. Otherwise, the calculation speed point is added and the process returns to step 210.

[0135] Step 270: Calculate the rotational state parameters at a given incoming flow velocity. The intersection of the two curves is the actual operating state at the given incoming flow velocity, and the corresponding rotational speed is the rotational speed of the rotating component. The remaining state parameters such as the resistance of the integrated motor propulsion device, the main flow channel flow, the gap flow channel flow, the axial thrust and torque of the rotating component are calculated based on the rotational speed.

[0136] The method for calculating the state parameters of the integrated motor propulsion device in the rotational state according to the embodiment of the present invention provides a detailed calculation simulation process. By combining mature simulation methods in related professions with force analysis, highly accurate state parameters can be obtained.

[0137] The following describes a device for calculating the state parameters of an integrated motor propulsion device provided in an embodiment of the present invention. The device for calculating the state parameters of an integrated motor propulsion device described below and the method for calculating the state parameters of an integrated motor propulsion device described above can be referred to in correspondence with each other.

[0138] like Figure 4 As shown, the device for calculating the state parameters of the integrated motor propulsion device according to an embodiment of the present invention includes:

[0139] An acquisition unit 410 is configured to acquire a calculated rotational speed, where the calculated rotational speed is used to characterize the rotational speed of the rotating component of the integrated motor propulsion device in a rotational state;

[0140] A first processing unit 420 is configured to input the calculated rotational speed into a first simulation model to obtain first torque, second torque, and fluid pressure information output by the first simulation model, wherein the first torque is used to characterize the rotational torque and axial thrust generated by the blade portion of the rotating assembly in a follow-rotating state, the second torque is used to characterize the rotational torque and axial thrust generated by the connector portion of the rotating assembly in a follow-rotating state, and the fluid pressure information is used to characterize the fluid pressure distribution within the rotating assembly in the follow-rotating state. The first simulation model is obtained by performing fluid mechanics simulation based on geometric parameters of the blade portion and the connector portion;

[0141] The second processing unit 430 is configured to determine a third torque based on the fluid pressure information, where the third torque is used to characterize the rotational torque and axial thrust generated by the gap portion of the rotating component in a rotating state;

[0142] a third processing unit 440 for determining a fourth torque based on the calculated rotational speed, the first torque, the second torque, and the third torque, the fourth torque being used to characterize the rotational torque and axial thrust generated by the bearing assembly of the rotating assembly in a rotating state;

[0143] The fourth processing unit 450 is used to determine the state parameters of the integrated motor propulsion device in the follow-up state based on the calculated rotation speed, the first torque, the second torque, the third torque and the fourth torque.

[0144] In some embodiments, the second processing unit 430 is configured to determine inlet and outlet pressure values ​​of the gap portion based on the fluid pressure information;

[0145] Based on the inlet and outlet pressure values, the third torque is determined.

[0146] In some embodiments, the second processing unit 430 is used to input the inlet and outlet pressure values ​​into the second simulation model to obtain a third torque output by the second simulation model, which is obtained by fluid mechanics simulation based on geometric parameters of the gap part.

[0147] In some embodiments, the third processing unit 440 is configured to determine the axial thrust of the fourth moment based on the axial thrust of the first moment, the second moment, and the third moment according to moment balance;

[0148] Based on the calculated rotational speed and characteristic parameters of the bearing assembly, a rotational torque of the fourth moment is determined.

[0149] In some embodiments, the acquisition unit 410 is used to acquire a calculated incoming flow velocity, where the calculated incoming flow velocity is used to characterize an incoming flow velocity corresponding to a medium environment in which the integrated motor propulsion device is located.

[0150] Based on the calculated incoming flow velocity, the calculated rotational velocity is determined.

[0151] In some embodiments, the fourth processing unit 450 is configured to obtain a first simulation curve showing a change in the rotational torque of the first torque versus the calculated rotational speed, and to obtain a second simulation curve showing a change in the target rotational torque versus the calculated rotational speed, wherein the target rotational torque is used to represent the sum of the rotational torques of the second torque, the third torque, and the fourth torque;

[0152] determining a calculated rotational speed at an intersection of the first simulation curve and the second simulation curve as a target rotational speed;

[0153] State parameters of the integrated motor propulsion device are determined based on the first torque, the second torque, the third torque, and the fourth torque corresponding to the target rotational speed.

[0154] Figure 5 An example of a physical structure diagram of an electronic device is shown below. Figure 5 As shown, the electronic device may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other via the communication bus 540. The processor 510 may call the logic instructions in the memory 530 to execute a method for calculating the state parameters of the integrated motor propulsion device, the method comprising: obtaining a calculated rotation speed, the calculated rotation speed being used to characterize the rotation speed of the rotating component of the integrated motor propulsion device in a rotation state;

[0155] Inputting the calculated rotational speed into the first simulation model, obtaining first torque, second torque, and fluid pressure information output by the first simulation model, wherein the first torque is used to characterize the rotational torque and axial thrust generated by the blade portion of the rotating component in the following rotation state, the second torque is used to characterize the rotational torque and axial thrust generated by the connector portion of the rotating component in the following rotation state, and the fluid pressure information is used to characterize the fluid pressure distribution within the rotating component in the following rotation state. The first simulation model is obtained by performing fluid mechanics simulation based on geometric parameters of the blade portion and the connector portion;

[0156] Determining a third torque based on the fluid pressure information, where the third torque is used to characterize the rotational torque and axial thrust generated by the gap portion of the rotating component in a rotating state;

[0157] Determining a fourth moment based on the calculated rotational speed, the first moment, the second moment, and the third moment, the fourth moment being used to characterize the rotational torque and axial thrust generated by the bearing assembly of the rotating assembly in a rotating state;

[0158] Based on the calculated rotational speed, the first torque, the second torque, the third torque and the fourth torque, state parameters of the integrated motor propulsion device in the follow-up state are determined.

[0159] In addition, the logic instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0160] On the other hand, the present invention further provides a computer program product, the computer program product including a computer program, the computer program being storable on a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer is capable of executing the method for calculating the state parameters of the integrated motor propulsion device provided by the above methods, the method including: obtaining a calculated rotational speed, the calculated rotational speed being used to characterize the rotational speed of the rotating component of the integrated motor propulsion device in a rotational state;

[0161] Inputting the calculated rotational speed into the first simulation model, obtaining first torque, second torque, and fluid pressure information output by the first simulation model, wherein the first torque is used to characterize the rotational torque and axial thrust generated by the blade portion of the rotating component in the following rotation state, the second torque is used to characterize the rotational torque and axial thrust generated by the connector portion of the rotating component in the following rotation state, and the fluid pressure information is used to characterize the fluid pressure distribution within the rotating component in the following rotation state. The first simulation model is obtained by performing fluid mechanics simulation based on geometric parameters of the blade portion and the connector portion;

[0162] Determining a third torque based on the fluid pressure information, where the third torque is used to characterize the rotational torque and axial thrust generated by the gap portion of the rotating component in a rotating state;

[0163] Determining a fourth moment based on the calculated rotational speed, the first moment, the second moment, and the third moment, the fourth moment being used to characterize the rotational torque and axial thrust generated by the bearing assembly of the rotating assembly in a rotating state;

[0164] Based on the calculated rotational speed, the first torque, the second torque, the third torque and the fourth torque, state parameters of the integrated motor propulsion device in the follow-up state are determined.

[0165] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the method for calculating the state parameters of the integrated motor propulsion device provided by the above methods is implemented, the method comprising: obtaining a calculated rotational speed, the calculated rotational speed being used to characterize the rotational speed of the rotating component of the integrated motor propulsion device in a rotational state;

[0166] Inputting the calculated rotational speed into the first simulation model, obtaining first torque, second torque, and fluid pressure information output by the first simulation model, wherein the first torque is used to characterize the rotational torque and axial thrust generated by the blade portion of the rotating component in the following rotation state, the second torque is used to characterize the rotational torque and axial thrust generated by the connector portion of the rotating component in the following rotation state, and the fluid pressure information is used to characterize the fluid pressure distribution within the rotating component in the following rotation state. The first simulation model is obtained by performing fluid mechanics simulation based on geometric parameters of the blade portion and the connector portion;

[0167] Determining a third torque based on the fluid pressure information, where the third torque is used to characterize the rotational torque and axial thrust generated by the gap portion of the rotating component in a rotating state;

[0168] Determining a fourth moment based on the calculated rotational speed, the first moment, the second moment, and the third moment, the fourth moment being used to characterize the rotational torque and axial thrust generated by the bearing assembly of the rotating assembly in a rotating state;

[0169] Based on the calculated rotational speed, the first torque, the second torque, the third torque and the fourth torque, state parameters of the integrated motor propulsion device in the follow-up state are determined.

[0170] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0171] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0172] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for calculating state parameters of an integrated motor propulsion device, characterized in that: include: Obtaining a calculated rotational speed, the calculated rotational speed being used to characterize the rotational speed of the rotating component of the integrated motor propulsion device in a follow-up state; Inputting the calculated rotational speed into a first simulation model to obtain first torque, second torque, and fluid pressure information output by the first simulation model, wherein the first torque is used to characterize the rotational torque and axial thrust generated by the blade portion of the rotating assembly in a rotating state, the second torque is used to characterize the rotational torque and axial thrust generated by the connector portion of the rotating assembly in a rotating state, and the fluid pressure information is used to characterize the fluid pressure distribution within the rotating assembly in the rotating state, and the first simulation model is obtained by performing fluid mechanics simulation based on geometric parameters of the blade portion and the connector portion; determining a third torque based on the fluid pressure information, wherein the third torque is used to characterize the rotational torque and axial thrust generated by the gap portion of the rotating component in a rotating state; determining a fourth moment based on the calculated rotational speed, the first moment, the second moment, and the third moment, the fourth moment being used to characterize the rotational torque and axial thrust generated by the bearing assembly of the rotating assembly in a rotating state; Based on the calculated rotational speed, the first torque, the second torque, the third torque, and the fourth torque, state parameters of the integrated electric motor propulsion device in a follow-up state are determined.

2. The method for calculating the state parameters of the integrated motor propulsion device according to claim 1, characterized in that: The determining of the third torque based on the fluid pressure information includes: Determining inlet and outlet pressure values ​​of the gap portion based on the fluid pressure information; The third torque is determined based on the inlet and outlet pressure values.

3. The method for calculating the state parameters of the integrated motor propulsion device according to claim 2, characterized in that: The determining the third torque based on the inlet and outlet pressure values ​​includes: The inlet and outlet pressure values ​​are input into a second simulation model to obtain the third torque output by the second simulation model, which is obtained by performing fluid mechanics simulation based on the geometric parameters of the gap part.

4. The method for calculating the state parameters of the integrated motor propulsion device according to claim 1, characterized in that: The determining of a fourth torque based on the calculated rotational speed, the first torque, the second torque, and the third torque includes: determining the axial thrust of the fourth moment based on the axial thrust of the first moment, the second moment, and the third moment according to moment balance; Based on the calculated rotational speed and characteristic parameters of the bearing assembly, a rotational torque of the fourth moment is determined.

5. The method for calculating the state parameters of the integrated motor propulsion device according to claim 1, characterized in that: The obtaining and calculating the rotation speed includes: Obtaining a calculated incoming flow velocity, where the calculated incoming flow velocity is used to characterize an incoming flow velocity corresponding to a medium environment in which the integrated motor propulsion device is located; Based on the calculated incoming flow velocity, the calculated rotational velocity is determined.

6. The method for calculating the state parameters of the integrated motor propulsion device according to any one of claims 1 to 5, characterized in that: The determining, based on the calculated rotational speed, the first torque, the second torque, the third torque, and the fourth torque, of the state parameters of the integrated motor propulsion device in the follow-up state includes: Obtaining a first simulation curve showing how the rotational torque of the first torque varies with the calculated rotational speed, and obtaining a second simulation curve showing how the target rotational torque varies with the calculated rotational speed, the target rotational torque being used to represent the sum of the rotational torques of the second torque, the third torque, and the fourth torque; determining the calculated rotational speed at the intersection of the first simulation curve and the second simulation curve as a target rotational speed; The state parameter is determined based on the first torque, the second torque, the third torque, and the fourth torque corresponding to the target rotation speed.

7. A device for calculating state parameters of an integrated motor propulsion device, characterized in that: include: an acquisition unit, configured to acquire a calculated rotational speed, wherein the calculated rotational speed is used to characterize the rotational speed of the rotating component of the integrated motor propulsion device in a follow-up rotation state; a first processing unit, configured to input the calculated rotational speed into a first simulation model to obtain first torque, second torque, and fluid pressure information output by the first simulation model, wherein the first torque is used to characterize the rotational torque and axial thrust generated by the blade portion of the rotating assembly in a rotating state, the second torque is used to characterize the rotational torque and axial thrust generated by the connector portion of the rotating assembly in a rotating state, and the fluid pressure information is used to characterize the fluid pressure distribution within the rotating assembly in the rotating state, wherein the first simulation model is obtained by performing fluid mechanics simulation based on geometric parameters of the blade portion and the connector portion; a second processing unit, configured to determine a third torque based on the fluid pressure information, wherein the third torque is configured to characterize a rotational torque and an axial thrust generated by a gap portion of the rotating assembly in a follow-rotation state; a third processing unit, configured to determine a fourth torque based on the calculated rotational speed, the first torque, the second torque, and the third torque, wherein the fourth torque is used to characterize the rotational torque and axial thrust generated by the bearing assembly of the rotating assembly in a follow-rotation state; The fourth processing unit is used to determine the state parameters of the integrated motor propulsion device in the follow-up state based on the calculated rotation speed, the first torque, the second torque, the third torque and the fourth torque.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method for calculating the state parameters of the integrated motor propulsion device according to any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for calculating the state parameters of the integrated motor propulsion device according to any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for calculating the state parameters of the integrated motor propulsion device according to any one of claims 1 to 6 is implemented.

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