Inertial navigation system lightened platform

Abstract

The utility model provides a kind of inertial navigation system light weight platform body, platform body is integrally formed by 3D printing, the internal structure of platform body includes: skin, entity part and dot matrix part;Entity part and dot matrix part form the main structure of platform body, skin is coated in the outer surface of main structure;Entity part includes: the region of the structural thickness of platform body is less than 2mm, the peripheral region of inertial device mounting point, circuit board mounting point, receiver mounting point and shell mounting point;Dot matrix part is: the region of the structural thickness of platform body is greater than or equal to 2mm, and avoid the peripheral region of inertial device mounting point, circuit board mounting point, receiver mounting point and shell mounting point;Dot matrix part uses three-dimensional dot matrix structure, and three-dimensional dot matrix structure is the BCC dot matrix grid of periodic arrangement.The platform body of the utility model is formed by 3D printing, and internal part is filled with three-dimensional dot matrix structure, and the light weight design of platform body can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of inertial navigation and control technology, and relates to a lightweight platform for an inertial navigation system. Background Technology

[0002] An inertial navigation system is an autonomous navigation system that does not rely on external information. Its core component, the inertial measurement unit (IMU), is typically mounted on a highly stable platform. Traditional platforms are mostly made of aluminum alloy through machining and casting processes. Although structurally stable, they have certain limitations, such as: heavy weight. To meet mechanical performance requirements, solid reinforcing ribs or thick-walled structures are often used, which greatly limits their application in weight-sensitive fields such as aerospace and drones, and is not conducive to system lightweighting. Traditional manufacturing processes are limited by factors such as cutting tools, making it difficult to achieve lightweight internal structural machining, thus limiting further performance optimization.

[0003] As market users place increasingly higher demands on the performance and weight of inertial navigation systems, and the operating environments become more complex, it is imperative to achieve lightweight design of products without compromising their environmental adaptability. Therefore, the increasingly mature metal 3D printing technology has emerged as a solution, urgently requiring a lightweight platform that can significantly reduce weight while maintaining mechanical performance.

[0004] It is worth noting that, in response to the growing demand for high consistency and efficient mass production, inertial systems are gradually shifting from customization to mass production. Existing inertial navigation system designs also need to be optimized and improved to meet the needs of future automated assembly and production. Utility Model Content

[0005] The purpose of this utility model is to at least solve one of the problems existing in the prior art.

[0006] Therefore, this utility model provides a lightweight platform for an inertial navigation system. The platform is 3D printed and its internal parts are filled with a three-dimensional dot matrix structure, which enables the lightweight design of the platform.

[0007] The technical solution of this utility model is as follows:

[0008] A lightweight platform for an inertial navigation system includes an upper mounting plate, a lower mounting plate, and an inertial device support. The upper and lower mounting plates are arranged in parallel and opposite directions, and are connected as a single structure by the inertial device support.

[0009] The inertial device support is provided with inertial device mounting points for mounting three inertial devices; the upper mounting plate is provided with circuit board mounting points for mounting circuit boards; the lower mounting plate is provided with receiver mounting points for mounting receivers and housing mounting points for mounting housings.

[0010] The platform is formed in one piece by 3D printing. The internal structure of the platform includes: skin, solid part and lattice part; the solid part and lattice part form the main structure of the platform, and the skin covers the outer surface of the main structure. The skin and the main structure are printed together; the solid part and the lattice part have a smooth transition.

[0011] The physical components include: the area of ​​the platform with a structural thickness of less than 2mm, and the outer perimeter of the inertial device mounting points, circuit board mounting points, receiver mounting points, and outer casing mounting points;

[0012] The dot matrix portion is the area of ​​the platform with a structural thickness greater than or equal to 2mm, avoiding the outer areas of the inertial device mounting points, circuit board mounting points, receiver mounting points, and outer casing mounting points; the dot matrix portion adopts a three-dimensional dot matrix structure, which is a periodically arranged BCC dot matrix grid.

[0013] Furthermore, the inertial device bracket is machined with threaded holes A for mounting three inertial devices, mounting holes for accommodating the three inertial devices, and weight-reduction holes for weight reduction; threaded holes A are the mounting points for the inertial devices.

[0014] The solid portion also includes the area surrounding the mounting holes and weight reduction holes;

[0015] The dot matrix portion also avoids the outer areas of the mounting holes and weight reduction holes;

[0016] The outer perimeter is an annular area with a thickness of 2-3 mm extending outward from the inner wall surface of the threaded hole A, the mounting hole, and the weight reduction hole.

[0017] Furthermore, the inertial device support is provided with reinforcing ribs;

[0018] The solid part also includes: the reinforcing rib area;

[0019] The dot matrix section also avoids the reinforcing rib area.

[0020] Furthermore, the upper mounting plate is provided with six mounting joints, which are cylindrical protrusions set on the upper surface of the upper mounting plate. The cylindrical protrusions are machined with threaded holes B that penetrate the cylindrical protrusions and the upper mounting plate. The axis of the threaded holes B is perpendicular to the upper mounting plate. The threaded holes B are the circuit board mounting points. The six circuit board mounting points are distributed in a circle.

[0021] The outer area of ​​the circuit board mounting point in the solid part is an annular area with a thickness of 2-3mm extending outward from the inner wall of the threaded hole B.

[0022] Furthermore, the lower mounting plate is a circular plate, and multiple threaded holes C are machined on the outer edge of the lower mounting plate. The axis of the threaded holes C is perpendicular to the lower mounting plate. The threaded holes C are the receiver mounting points, and the multiple receiver mounting points are distributed in a circle.

[0023] The outer circumferential surface of the lower mounting plate is machined with three concave grooves, and radial threaded holes E are machined in the grooves. These threaded holes E are the mounting points of the outer shell.

[0024] The outer perimeter of the receiver mounting point and the outer casing mounting point of the solid part is an annular area with a thickness of 2-3mm extending outward from the inner wall surface of the threaded holes C and E.

[0025] Furthermore, three threaded holes D are machined on the outer edge of the lower mounting plate, and the axis of the threaded holes D is perpendicular to the lower mounting plate.

[0026] The solid portion also includes: the area surrounding the threaded hole D;

[0027] The dot matrix portion also avoids the outer area of ​​the threaded hole D;

[0028] The outer perimeter is an annular region with a thickness of 2-3 mm extending outward from the inner wall surface of the threaded hole D.

[0029] Furthermore, the outer edge of the upper mounting plate between two adjacent circuit board mounting points is hollowed out into a concave arc surface, and a rectangular opening is hollowed out at the position corresponding to the inertial device between two adjacent circuit board mounting points and perpendicular to the axis of the upper mounting plate.

[0030] Furthermore, the platform is 3D printed in one piece from AlSi10Mg material.

[0031] Furthermore, the size of the lattice grid of the platform is adjusted according to the actual wall thickness, with the unit cell size used in the sparse area being 1.5mm×1.5mm×1.5mm and the unit cell size used in the dense area being 4mm×4mm×4mm.

[0032] Furthermore, the assembly method between the platform and external equipment is as follows: the circuit board is screwed to the upper surface of the upper mounting plate of the platform through the circuit board mounting points; the inertial devices are screwed to the inertial device brackets of the platform from three orthogonal directions; after the internal wiring is completed, the outer casing is installed and fixed to the platform through the three outer casing mounting points on the side; according to the needs of the actual use scenario, the receiver is suspended below the lower mounting plate of the platform through the receiver mounting points; all screws are of the same specification.

[0033] By applying the above technical solution, this utility model has the following beneficial effects:

[0034] (1) The lightweight platform of this utility model combines an integrated and compact structural design with internal lattice cell filling and is integrally formed using metal 3D printing technology. This can solve the technical problems of low integration and large volume and weight of inertial navigation structure in the prior art to a certain extent, while meeting the mechanical environment adaptability of the system. The integrated and compact structural design is reflected in the fact that multiple circuit boards are integrated into one integrated circuit and installed only on the top, saving a lot of installation space. All products that are matched with the platform are compactly arranged, and the platform structure minimizes the volume ratio of each product through topology optimization.

[0035] (2) The dot matrix portion of this utility model should avoid the outer areas of the inertial device mounting point, circuit board mounting point, receiver mounting point and housing mounting point, so that the connection area can be locally strengthened while reducing weight.

[0036] (3) All screws connecting the platform of this utility model to external equipment are of the same specification, which facilitates the automated assembly and disassembly of the system structure. Attached Figure Description

[0037] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the present invention and, together with the textual description, explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0038] Figure 1 This is a structural diagram of the platform.

[0039] Figure 2 A partial cross-sectional view of the dot matrix portion on which the flat plate is mounted on the platform.

[0040] Figure 3 This is a partial cross-sectional schematic diagram of the dot matrix portion of the inertial device support of the platform.

[0041] Figure 4 Assembly drawing showing the connection between the platform and external equipment;

[0042] Wherein, 0-platform body, 1-circuit board mounting point, 2-inertial device mounting point, 3-receiver mounting point, 4-outer shell mounting point, 5-external mounting point, 6-upper mounting plate, 7-inertial device bracket, 8-lower mounting plate, 9-inertial device, 10-circuit board, 11-receiver. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0046] This embodiment provides a lightweight platform for an inertial navigation system. The platform 0 has two or more mounting planes and multiple mounting points for connecting to external devices. The external devices include inertial devices 9, circuit boards 10, housings, receivers 11, and other external connection mechanisms. In this embodiment, the other external connection mechanisms utilize vibration damping rings. All connections of the external devices to the platform 0 are achieved using screws. The specific structure is as follows:

[0047] In terms of appearance, see Appendix Figure 1The platform 0 includes: an upper mounting plate 6, a lower mounting plate 8, and an inertial device bracket 7; the upper mounting plate 6 and the lower mounting plate 8 are arranged in parallel and opposite to each other, and are connected into an integral structure by the inertial device bracket 7; the inertial device bracket 7 is located between the lower surface of the upper mounting plate 6 and the upper surface of the lower mounting plate 8.

[0048] The inertial device bracket 7 is used to mount the three inertial devices 9, which are orthogonally distributed. The inertial device bracket 7 is machined with threaded holes A for mounting the three inertial devices 9, mounting holes for accommodating the three inertial devices 9, and weight-reduction holes for weight reduction. Threaded holes A are the mounting points 2 for the inertial devices. The three inertial devices 9 are mounted on the inertial device bracket 7 with screws. The inertial device bracket 7 is provided with reinforcing ribs to enhance its strength. Through geometric topology simulation optimization, the relative positions and support structures of the three orthogonal inertial devices 9 are designed collaboratively, so that the structural gaps of each inertial device 9 are close to the physical lower limit of manufacturing and assembly, and the diagonal size of the arrangement is compressed to the maximum extent. The theoretical optimal space utilization is achieved, and the system's outer diameter is reduced by 6mm, a reduction of 5.2%. This structural optimization scheme not only conforms to the minimum envelope volume design principle, but also verifies its excellent performance in thermal and mechanical reliability through finite element analysis.

[0049] The upper mounting plate 6 is used to mount the circuit board 10. The upper mounting plate 6 has six mounting joints, which are cylindrical protrusions on the upper surface of the upper mounting plate 6. The cylindrical protrusions are machined with threaded holes B that penetrate the cylindrical protrusions and the upper mounting plate 6. The axis of the threaded holes B is perpendicular to the upper mounting plate 6. The threaded holes B are the circuit board mounting points 1. The six circuit board mounting points 1 are distributed in a circle. The circuit board 10 is mounted on the upper surface of the upper mounting plate 6 with screws, and a gap is left between the circuit board 10 and the upper mounting plate 6. In order to reduce the weight of the platform 0, the outer edge of the upper mounting plate 6 between two adjacent circuit board mounting points 1 is hollowed out into a concave arc surface. In order to facilitate the installation of the inertial device 9 whose axis is perpendicular to the upper mounting plate 6, a rectangular opening is hollowed out between two adjacent circuit board mounting points 1 at the position corresponding to the inertial device 9.

[0050] The lower mounting plate 8 is a circular plate. Multiple threaded holes C and three threaded holes D are machined on the outer edge of the lower mounting plate 8. The axes of the threaded holes C and D are perpendicular to the lower mounting plate 8. The threaded hole C is the receiver mounting point 3, and the multiple receiver mounting points 3 are distributed in a circle. The receiver 11 is mounted on the lower surface of the lower mounting plate 8 by screws. The threaded hole D is the external mounting point 5, and the vibration damping ring is mounted on the external mounting point 5 by screws.

[0051] The outer circumferential surface of the lower mounting plate 8 is machined with three concave grooves, and radial threaded holes E are machined in the grooves. These threaded holes E are the outer shell mounting points 4. The outer shell is fitted over the entire platform 0 and fixed to the outer circumferential surface of the lower mounting plate 8 with screws.

[0052] To achieve lightweight construction of the platform 0, it is integrally formed from AlSi10Mg material using additive manufacturing technology (i.e., 3D printing). The internal part of the 3D-printed platform 0 is filled with a three-dimensional lattice structure. In terms of composition, the platform 0 consists of a skin, a solid part, and a lattice part. The solid part and the lattice part constitute the main structure of the platform 0, and the skin covers the outer surface of the main structure. The skin and the main structure are printed together. The solid part and the lattice part have a smooth transition.

[0053] The solid part includes: the area with a structural thickness of less than 2mm for the platform body 0, the outer area of ​​the threaded hole (AE), the outer area of ​​the mounting hole and the weight reduction hole, and the reinforcing rib area. The solid part is used to ensure the installation strength and accuracy of the platform body 0. Among them, the outer area of ​​the threaded hole (AE), the outer area of ​​the mounting hole and the weight reduction hole are annular areas with a thickness of 2-3mm extending outward from the inner wall surface of the threaded hole, the mounting hole and the weight reduction hole.

[0054] The lattice portion refers to the area excluding the solid portion. This lattice portion employs a three-dimensional lattice structure, which is a periodically arranged BCC (body-centered cubic) lattice grid. The grid size is adjusted according to the actual wall thickness, resulting in uniform density. The sparse areas use unit cells approximately 1.5mm × 1.5mm × 1.5mm, while the dense areas use unit cells approximately 4mm × 4mm × 4mm. In this embodiment, the portion of the plate 6 mounted on it and supported by the inertial device bracket 7 has a sparse grid, while the other portions have a dense grid, as shown in the attached diagram. Figure 2 As shown; the lattice portion of the inertial device support 7 consists of dense and sparse grids, as illustrated in the attached diagram. Figure 3 As shown;

[0055] See appendix Figure 4The assembly method between the platform 0 and the external equipment is as follows: the circuit board 10 is screwed onto the upper surface of the upper mounting plate 6 of the platform 0 through six circuit board mounting points 1; the inertial device 9 is screwed onto the inertial device bracket 7 of the platform 0 from three orthogonal directions; after completing the internal wiring, the outer shell is installed and fixed onto the platform 0 through three outer shell mounting points 4 on the side; according to the needs of the actual use scenario, the receiver 11 can be hoisted under the lower mounting plate 8 of the platform 0 through the receiver mounting point 3; finally, the platform 0 is connected to the vibration damping ring through three external mounting points 5, or it can be directly installed and used without installing the vibration damping ring; the screw specifications used for connecting the platform 0 and the external equipment are consistent, and the screw installation can be achieved through a simple automated assembly process by a robotic arm, which greatly improves production efficiency.

[0056] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0058] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lightweight platform for an inertial navigation system, characterized in that, The platform's shape includes: an upper mounting plate, a lower mounting plate, and an inertial device support; the upper and lower mounting plates are arranged in parallel and opposite directions, and are connected as a single structure by the inertial device support. The inertial device support is provided with inertial device mounting points for mounting three inertial devices; the upper mounting plate is provided with circuit board mounting points for mounting circuit boards; the lower mounting plate is provided with receiver mounting points for mounting receivers and housing mounting points for mounting housings. The platform is formed in one piece by 3D printing. The internal structure of the platform includes: skin, solid part and lattice part; the solid part and lattice part form the main structure of the platform, and the skin covers the outer surface of the main structure. The skin and the main structure are printed together; the solid part and the lattice part have a smooth transition. The physical components include: the area of ​​the platform with a structural thickness of less than 2mm, and the outer perimeter of the inertial device mounting points, circuit board mounting points, receiver mounting points, and outer casing mounting points; The dot matrix portion is the area of ​​the platform with a structural thickness greater than or equal to 2mm, avoiding the outer areas of the inertial device mounting points, circuit board mounting points, receiver mounting points, and outer casing mounting points; the dot matrix portion adopts a three-dimensional dot matrix structure, which is a periodically arranged BCC dot matrix grid.

2. The lightweight platform for an inertial navigation system as described in claim 1, characterized in that, The inertial device bracket is machined with threaded holes A for mounting three inertial devices, mounting holes for accommodating the three inertial devices, and weight reduction holes for weight reduction; threaded holes A are the mounting points for the inertial devices. The solid portion also includes the area surrounding the mounting holes and weight reduction holes; The dot matrix portion also avoids the outer areas of the mounting holes and weight reduction holes; The outer perimeter is an annular area with a thickness of 2-3 mm extending outward from the inner wall surface of the threaded hole A, the mounting hole, and the weight reduction hole.

3. The lightweight platform for an inertial navigation system as described in claim 1, characterized in that, The inertial device support is provided with reinforcing ribs; The solid part also includes: the reinforcing rib area; The dot matrix section also avoids the reinforcing rib area.

4. The lightweight platform for an inertial navigation system as described in claim 1, characterized in that, The upper mounting plate is provided with six mounting joints. The six mounting joints are cylindrical protrusions set on the upper surface of the upper mounting plate. The cylindrical protrusions are machined with threaded holes B that penetrate the cylindrical protrusions and the upper mounting plate. The axis of the threaded holes B is perpendicular to the upper mounting plate. The threaded holes B are the circuit board mounting points. The six circuit board mounting points are distributed in a circle. The outer area of ​​the circuit board mounting point in the solid part is an annular area with a thickness of 2-3mm extending outward from the inner wall of the threaded hole B.

5. The lightweight platform for an inertial navigation system as described in claim 1, characterized in that, The lower mounting plate is a circular plate, and multiple threaded holes C are machined on the outer edge of the lower mounting plate. The axis of the threaded holes C is perpendicular to the lower mounting plate. The threaded holes C are the receiver mounting points, and the multiple receiver mounting points are distributed in a circle. The outer circumferential surface of the lower mounting plate is machined with three concave grooves, and radial threaded holes E are machined in the grooves. These threaded holes E are the mounting points of the outer shell. The outer perimeter of the receiver mounting point and the outer casing mounting point of the solid part is an annular area with a thickness of 2-3mm extending outward from the inner wall surface of the threaded holes C and E.

6. The lightweight platform for an inertial navigation system as described in claim 1, characterized in that, The outer edge of the lower mounting plate is also machined with three threaded holes D, and the axis of the threaded holes D is perpendicular to the lower mounting plate. The solid portion also includes: the area surrounding the threaded hole D; The dot matrix portion also avoids the outer area of ​​the threaded hole D; The outer perimeter is an annular region with a thickness of 2-3 mm extending outward from the inner wall surface of the threaded hole D.

7. The lightweight platform for an inertial navigation system as described in claim 1, characterized in that, The outer edge of the upper mounting plate between two adjacent circuit board mounting points is hollowed out to form a concave arc surface. A rectangular opening is hollowed out between two adjacent circuit board mounting points at the position corresponding to the inertial device perpendicular to the axis of the upper mounting plate.

8. The lightweight platform for an inertial navigation system as described in claim 1, characterized in that, The platform is 3D printed in one piece from AlSi10Mg material.

9. A lightweight platform for an inertial navigation system as described in claim 1, characterized in that, The size of the lattice grid of the platform is adjusted according to the actual wall thickness. The unit cell size used in the sparse area is 1.5mm×1.5mm×1.5mm, and the unit cell size used in the dense area is 4mm×4mm×4mm.

10. A lightweight platform for an inertial navigation system as described in claim 1, characterized in that, The assembly method between the platform and external equipment is as follows: the circuit board is screwed to the upper surface of the upper mounting plate of the platform through the circuit board mounting points; the inertial devices are screwed to the inertial device bracket of the platform from three orthogonal directions; after the internal wiring is completed, the outer shell is installed and fixed to the platform through the three outer shell mounting points on the side; according to the needs of the actual use scenario, the receiver is suspended below the lower mounting plate of the platform through the receiver mounting points; all screws are of the same specification.

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