Coupling design method for transmission chain and spatial layout of ship transmission system

Abstract

The application relates to a coupling design method for a transmission chain and spatial layout of a ship transmission system and relates to the field of coupling of a transmission chain and spatial layout of a ship transmission system. The application solves the problems of lack of design means for spatial layout of a ship transmission device in conceptual design of the ship transmission system, low visualization degree and low coupling degree of the transmission chain and spatial design. First, a transmission chain data file is analyzed, a transmission unit parameterized model is established according to analyzed transmission unit structure parameters, and an initial skeleton model of a transmission system located between a main engine and a propeller is established in a visual manner based on the transmission unit parameterized model and a logical relationship of the transmission unit according to overall design requirements and under the condition of positioning constraints and coaxial system constraints of the number and spatial positioning coordinates of the main engine and the propeller. The spatial layout of the skeleton model is modified through local adjustment, and a transmission system spatial model is obtained by coupling the spatial layout with the transmission chain. The application is mainly used for rapid visual modeling of the ship transmission system.

Description

Technical Field

[0001] This invention relates to the field of coupling of transmission chain and spatial layout in marine transmission systems. Background Technology

[0002] Ship performance largely depends on the quality of its transmission system design. The general principle of a ship's transmission system is to transmit power from the main engine to the propeller through different transmission relationships to meet the navigation requirements under different operating conditions. Although researchers have made significant progress in ship transmission system design in recent years, current commercial computer-aided design software still has shortcomings such as not supporting conceptual modeling and being unable to quickly design schemes.

[0003] Currently, there are problems in the conceptual design of ship transmission devices, such as a lack of means for designing the spatial layout of the transmission system, low visualization, and low coupling between the transmission chain and spatial design, which need to be addressed. Summary of the Invention

[0004] The purpose of this invention is to address the problems of insufficient means for spatial layout design of transmission systems, low visualization, and low coupling between transmission chains and spatial design in the conceptual design of ship transmission devices. This invention provides a method for coupling design of transmission chains and spatial layout in ship transmission systems.

[0005] A method for coupling the transmission chain and spatial layout of a ship's transmission system, the method comprising:

[0006] Parsing the drivetrain data file:

[0007] The transmission chain data file is decomposed to obtain the structural parameters of the transmission units, the logical relationships between the transmission units, the number of main units and propellers, and the spatial positioning coordinates.

[0008] Establish a parametric model of the transmission unit:

[0009] A parameterized model of the transmission unit is established based on the structural parameters of the transmission unit using a 3D class library;

[0010] Establish the initial skeleton model of the transmission system:

[0011] Based on the number of main engine and propeller and the spatial positioning coordinates as positioning constraints and coaxial system constraints, and according to the overall design requirements, an initial skeleton model of the transmission system located between the main engine and propeller is established in a visual manner based on the parameterized model of the transmission unit and the logical relationship of the transmission unit.

[0012] Overall layout adjustments:

[0013] By adjusting the gear positions and shaft layout in the initial skeleton model of the transmission system, the gears mesh in space, resulting in a corrected initial skeleton model of the transmission system. The transmission chain is then coupled with the corrected initial skeleton model of the transmission system to obtain the spatial model of the transmission system, thus completing the establishment of the spatial model of the transmission system.

[0014] The principle for adjusting the gear positions and shaft layout in the initial skeleton model of the transmission system is to satisfy the meshing relationship and avoid interference.

[0015] Preferably, the transmission unit includes gears, clutches, couplings, bearings, and shafts.

[0016] Preferably, the logical relationship of the transmission unit includes the coaxial relationship of the transmission unit and the gear meshing relationship.

[0017] Preferably, the implementation methods for establishing a parameterized model of the transmission unit based on the structural parameters of the transmission unit include:

[0018] Based on the structural parameters of various transmission units, a three-dimensional topological model of the transmission unit is established from point to line, from line to surface, and from surface to volume using the topology method. This three-dimensional topological model serves as the parameterized model of the transmission unit.

[0019] Preferably, adjusting the gear positions and shaft layout in the initial skeleton model of the transmission system to achieve spatial gear meshing includes the following methods:

[0020] First, achieve gear alignment: select one gear as the current position as the reference position, and axially align the other gears on the same gear pair with this gear at the reference position to satisfy the constraint of meshing gear alignment;

[0021] Secondly, shaft system adjustment: by adjusting the position of the shaft system, the meshing gears are made to mesh in space.

[0022] The beneficial effects of this invention are:

[0023] This invention presents a method for coupling the transmission chain and spatial layout of a ship's transmission system, enabling rapid modeling of the transmission system's topological relationships. It involves visually modeling the spatial layout of the transmission system during design. First, the transmission chain data file is processed, specifically including the basic structural parameters of key components (transmission units) and their logical relationships. A graphical interface is created using object-oriented technology. Based on the basic structural parameters and logical relationships recorded in the data file, the transmission units are parameterized and visualized, resulting in a parameterized model of the transmission units. This parameterized model is then used to establish the initial skeleton model of the transmission system. Finally, a layout adjustment method is used to modify the spatial layout of the initial skeleton model and couple it with the transmission chain to form a complete topological relationship model, thus obtaining the spatial model of the transmission system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the coupling design method for the transmission chain and spatial layout of the ship transmission system described in this invention;

[0025] Figure 2 This is a schematic diagram of the parametric model of the transmission unit; where, Figure 2 'a' represents the parametric model when the transmission unit is a bearing. Figure 2 b is the parametric model when the transmission unit is a shaft. Figure 2 c represents the parametric model when the transmission unit is a gear. Figure 2 d represents the parametric model when the transmission unit is a coupling;

[0026] Figure 3 This is a schematic diagram of the initial skeleton model of the transmission system;

[0027] Figure 4 This is a detailed schematic diagram of an existing transmission system. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0030] To address the lack of methods for spatial layout design of ship transmission systems in conceptual design, as well as the low level of visualization and weak coupling between the transmission chain and spatial design, this embodiment describes a method for coupling the transmission chain and spatial layout of ship transmission systems. This method primarily utilizes topology to achieve parametric modeling of transmission units, and interactive adjustments to obtain the spatial layout of the transmission system. The main idea is geared towards the conceptual design stage of the transmission system. After the transmission chain design is completed, the spatial layout model of the transmission system is determined and established based on the basic structural parameters of the transmission units and the logical relationships between them. This provides data for further detailed design and engineering design, such as... Figure 1 As shown, the method described in this embodiment includes:

[0031] Step 1: Parse the transmission chain data file: Decompose the transmission chain data file to obtain the structural parameters of the transmission unit, the logical relationship of the transmission unit, the number of main engine and propeller, and the spatial positioning coordinates;

[0032] Step 2: Establish a parametric model of the transmission unit: Use a 3D class library to establish a parametric model of the transmission unit based on its structural parameters;

[0033] Step 3: Establish the initial skeleton model of the transmission system: Based on the number of main engine and propeller and the spatial positioning coordinates as positioning constraints and coaxial system constraints, and according to the overall design requirements, establish the initial skeleton model of the transmission system located between the main engine and propeller through visualization based on the parameterized model of the transmission unit and the logical relationship of the transmission unit.

[0034] Step 4: Overall Layout Adjustment: Adjust the gear positions and shaft layout in the initial skeleton model of the transmission system to make the gears mesh in space, thus obtaining the corrected initial skeleton model of the transmission system; couple the transmission chain with the corrected initial skeleton model of the transmission system to obtain the spatial model of the transmission system, thus completing the establishment of the spatial model of the transmission system; the principle for adjusting the gear positions and shaft layout in the initial skeleton model of the transmission system is to satisfy the meshing relationship and avoid interference.

[0035] The transmission chain data file contains relevant data about the transmission chain and spatial model. Parsing the transmission chain data file can be achieved using existing technologies. When the transmission unit includes gears, clutches, couplings, bearings, and shafts, the parametric model of the transmission unit can be found here. Figure 2 The structural parameters of the transmission unit include those of gears, bearings, couplings, clutches, and shafts. The function of each type of transmission unit determines its structural parameters. Each type of transmission unit defines a corresponding set of connectable interfaces. Through matching between these interface sets and between interface types, the mapping from the abstract connection relationship of the transmission chain to the physical connection relationship of the transmission system is completed. Taking a gear as an example, its structural parameters include the number of teeth z, module m, helix angle β, and normal pressure angle α. n Effective tooth width b, inner diameter d h The aforementioned structural parameters are obtained by decomposing the transmission chain data file. In addition, for the main engine and propeller, as an example, gears can be herringbone gears or planetary gear trains.

[0036] The transmission system should meet the overall design requirements and physical logic. The overall design requirements may include the type of main engine, the number of main engines, the propeller speed, the coordinates of the main engine, the direction of the main engine, and the direction of the propeller. The physical logic includes, but is not limited to, the inner diameter of the shaft being smaller than the outer diameter, the main engine and the propeller being shaft-end units, and power being input from the main engine and output from the propeller.

[0037] The logical relationships of transmission units include coaxial relationships and gear meshing relationships. All shafts with coaxial relationships and connected by couplings or clutches are collectively referred to as a shaft system. All parts on a shaft system must satisfy coaxial relationships, and their positional sequence on the shafts must conform to the transmission chain design. Meshing relationships are established using gear meshing constraints, which are achieved by adjusting the shaft system position and changing the number of teeth on the idler gear.

[0038] The specific logical relationship establishment and layout adjustment include, but are not limited to: all units in the same shaft system are connected through shafts, and their connection order is consistent with the order in which the transmission chain is established; the transmission chain meshing pairs correspond to the gear meshing relationship in space; the meshing in space is satisfied by adjustment; if meshing is not possible, the number of idler gear teeth should be modified and the modification information should be returned to the transmission chain, etc.

[0039] The overall layout adjustment is based on the fact that the constraints of the ship's transmission chain are complex, and different constraints influence each other. Directly solving for the spatial position of each component (transmission unit) is difficult and the results are uncertain, easily leading to no solution or countless solutions. Moreover, direct solutions do not allow users to customize the 3D spatial layout according to their needs. Therefore, an interactive, step-by-step approach to achieve the 3D spatial layout is proposed. First, an initial skeleton model is established, requiring the number of main engines and propellers and their spatial positioning coordinates, which are then visualized. The initial skeleton model satisfies the positioning constraints and coaxial relationship constraints of the main engine and propellers. Next, gear meshing operations are performed. Through interactive selection, a gear is chosen, and gears belonging to the same gear pair automatically align with it, satisfying the alignment constraint of meshing gears. Finally, the shaft system position is adjusted to satisfy the spatial meshing constraints of each pair of gears.

[0040] In step two, the implementation methods for establishing a parameterized model of the transmission unit based on the structural parameters of the transmission unit include:

[0041] Based on the structural parameters of each transmission unit, a three-dimensional topological model of the transmission unit is established from point to line, from line to surface, and from surface to volume using the topology method. This three-dimensional topological model serves as the parameterized model of the transmission unit.

[0042] The initial skeleton model of the transmission system established in step three refers to the model before the shaft system has been fully adjusted in space through gear meshing. Generating the initial skeleton model is the beginning of completing the entire 3D model design. The purpose of establishing the initial skeleton model is twofold: first, to meet the positioning constraints and coaxial constraints of the main engine and propeller of the ship's transmission system; and second, to visualize all shaft systems and the various transmission units on the shaft systems, facilitating interactive shaft system spatial layout to generate a complete 3D model of the transmission system.

[0043] Step four involves spatial layout adjustment. Based on the initial transmission system skeleton model established in step three, and considering that the gears haven't yet established spatial meshing relationships after the initial skeleton model is built, an interactive approach is used to achieve axial alignment and adjust the shaft system to establish spatial gear meshing. Specifically, adjusting the gear positions and shaft system layout in the initial transmission system skeleton model to achieve spatial gear meshing includes:

[0044] First, achieve gear alignment: select one gear as the current position as the reference position, and axially align the other gears on the same gear pair with this gear at the reference position to satisfy the constraint of meshing gear alignment;

[0045] Secondly, shaft system adjustment: by adjusting the position of the shaft system, the meshing gears are made to mesh in space.

[0046] The main engine and propeller, as power input and output, constitute strong constraints on the spatial model, meaning the main engine can only establish a direct connection with the coupling. In practical applications, the 3D assembly model can be simplified, using a conceptual model. That is, various transmission units in the basic components can be represented by conceptual models. For example, cylindrical gears (spur gears, helical gears, and herringbone gears) are replaced by cylinders with holes. A typical planetary gear train consists of a sun gear, planet gears, and an internal gear ring (not considering the planet carrier), all of which are cylindrical gears; here, cylinders with holes are used to represent them. See details... Figure 3 .

[0047] Figure 4 A detailed schematic diagram of an existing transmission system is given, from... Figure 4 The type of transmission unit used in the transmission system can be seen in the image.

[0048] This invention provides a method for coupling the transmission chain and spatial layout of a ship's transmission system, enabling rapid modeling of the transmission system's topological relationship; it also overcomes the limitation of current CAE / CAM software in not being able to perform conceptual design.

[0049] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A method for coupling the transmission chain and spatial layout of a ship's transmission system, characterized in that, The method includes: Parsing the drivetrain data file: The transmission chain data file is decomposed to obtain the structural parameters of the transmission units, the logical relationships of the transmission units, the number of main engines and propellers, and the spatial positioning coordinates; the logical relationships of the transmission units include the coaxial relationships of the transmission units and the gear meshing relationships; Establish a parametric model of the transmission unit: A parameterized model of the transmission unit is established based on the structural parameters of the transmission unit using a 3D class library. Specifically, based on the structural parameters of various transmission units, a 3D topological model of the transmission unit is established from point to line, from line to surface, and from surface to volume using the topology method. This 3D topological model serves as the parameterized model of the transmission unit. Establish the initial skeleton model of the transmission system: Based on the number of main engine and propeller and the spatial positioning coordinates as positioning constraints and coaxial system constraints, and according to the overall design requirements, an initial skeleton model of the transmission system located between the main engine and propeller is established in a visual manner based on the parameterized model of the transmission unit and the logical relationship of the transmission unit. Overall layout adjustments: By adjusting the gear positions and shaft layout in the initial skeleton model of the transmission system, the gears mesh in space, resulting in a corrected initial skeleton model of the transmission system. The transmission chain is then coupled with the corrected initial skeleton model of the transmission system to obtain the spatial model of the transmission system, thus completing the establishment of the spatial model of the transmission system. The principle for adjusting the gear positions and shaft layout in the initial skeleton model of the transmission system is to satisfy the meshing relationship without interference. Adjusting the gear positions and shaft layout in the initial skeleton model of the transmission system to achieve spatial gear meshing includes the following methods: First, achieve gear alignment: select one gear as the current position as the reference position, and axially align the other gears on the same gear pair with this gear at the reference position to satisfy the constraint of meshing gear alignment; Secondly, shaft system adjustment: by adjusting the position of the shaft system, the meshing gears are made to mesh in space.

2. The method for coupling design of transmission chain and spatial layout in a ship transmission system according to claim 1, characterized in that, The transmission unit includes gears, clutches, couplings, bearings, and shafts.

Images