Gradient micro-truss lattice structure with broadband vibration reduction function

Abstract

The invention discloses a gradient micro-truss lattice structure with a broadband vibration reduction function, and belongs to the technical field of aerospace vibration reduction structures. According to the gradient micro-truss lattice structure for broadband vibration reduction, the photonic crystal principle and the additive manufacturing process are combined, structural integrated forming is achieved, the lattice structure has the broadband vibration reduction effect due to the gradient change of the size in the lattice structure, and the lattice structure has the bearing capacity due to the combination of the lattice and the panel; the material can be used for various key parts or parts in aerospace crafts, such as engine compartment wall plate structures, airborne equipment mounting support plates and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace vibration reduction structures, and in particular relates to a gradient micro-truss lattice structure with a broadband vibration reduction function. Background Art

[0002] With the continuous development of aerospace vehicles, the airframe structure and airborne equipment are developing towards a highly integrated, precise and lightweight direction. Their high reliability, stability and accuracy requirements have put forward higher requirements on the vibration reduction characteristics of the structure. Traditional shock absorbers and vibration reduction structures are restricted by factors such as their own weight and volume, and cannot meet the increasingly stringent lightweight vibration reduction requirements of aviation equipment installation structures. In order to further improve the adaptability of modern airborne equipment in vibration environments and reduce vibration transmission between airframe structures, a lightweight broadband vibration reduction structure is urgently needed. At the same time, traditional shock absorbers and vibration reduction structures still have the following problems:

[0003] a) Not much consideration is given to the integration of vibration reduction and load bearing, resulting in a large structural weight using traditional vibration reduction methods;

[0004] b) Traditional shock absorbers are generally composed of multiple materials / devices, and the manufacturing process is too complicated;

[0005] c) It cannot withstand large load levels of aircraft, and some vibration reduction structures cannot be put into engineering applications. Summary of the invention

[0006] The present invention proposes a gradient micro-truss lattice structure with a broadband vibration reduction function to solve the problems raised in the above background technology.

[0007] The gradient micro-truss lattice structure for broadband vibration reduction combines the principle of phononic crystals and additive manufacturing technology to achieve structural integrated molding. The gradient change in size in the lattice structure enables it to have a broadband vibration reduction effect. The combination of the lattice and the panel also enables it to have load-bearing capacity. It can be used in various key parts or components in aerospace vehicles, such as engine cabin wall panel structures, airborne equipment installation support plates, etc.

[0008] The present invention provides a gradient lightweight lattice structure based on a micro-truss unit cell and additive manufacturing technology, which can be customized in size according to actual vibration reduction requirements and has load-bearing and broadband vibration reduction functions.

[0009] To achieve the above object, the present invention adopts the following technical solution:

[0010] A gradient micro-truss lattice structure with a broadband vibration reduction function comprises a load-bearing panel 1, a load-bearing frame 2 and a gradient micro-truss lattice cell 3.

[0011] The load-bearing panel 1 includes an upper and a lower panel, which bears the load within the surface during the use of the structure;

[0012] The load-bearing frame 2 is a cubic frame connected to the upper and lower panels, and bears the lateral, longitudinal and out-of-plane loads during the use of the structure.

[0013] The gradient micro-truss lattice cell 3 is divided into two types, one is a central spherical vibration damper, and the other is a central cantilever hanging ball vibration damper. Both vibration dampers are connected to the nodes of the load-bearing frame 2 through the micro-truss, and are not connected to the upper and lower panels. The concentrated mass body in the gradient micro-truss lattice cell 3 cooperates with the micro-truss to play a role in vibration dissipation.

[0014] The load-bearing panel 1, the load-bearing frame 2 and the gradient micro-truss lattice cell 3 are integrally formed by an additive manufacturing process, and the material is the same, and typical materials are aluminum alloy, titanium alloy and stainless steel.

[0015] Furthermore, the central spherical vibration damper refers to a sphere in each gradient micro-truss lattice cell 3, and two ends of the sphere are respectively connected to the diagonally connected micro-trusses in the gradient micro-truss lattice cell 3.

[0016] Furthermore, the central cantilever hanging ball vibration damper refers to two spheres in each gradient micro-truss lattice cell 3, the two spheres are respectively connected to the two ends of a transverse micro-truss, and the center of the transverse micro-truss is fixed by connecting the diagonal micro-trusses of the gradient micro-truss lattice cell 3.

[0017] Furthermore, by designing the size and material of the sphere and its microtruss in a gradient microtruss lattice structure with a wide-band vibration reduction function, the frequency of the local resonance is controlled, thereby specifically reducing the load amplitude at the corresponding frequency in the vibration load, and realizing the wide-band vibration reduction function through a gradient design.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] a) The size of the lattice cell can be precisely customized according to the needs, so as to achieve specific broadband vibration reduction goals;

[0020] b) The lattice structure of the present invention is processed by additive manufacturing and integrated molding, and has the characteristics of high rigidity and high reliability;

[0021] c) The lattice structure of the present invention can withstand large in-plane and out-of-plane loads, and at the same time can meet the lightweight design, thereby meeting the design requirements of aircraft vibration reduction structures in actual engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] FIG. 1( a ) is an isometric view of a gradient micro-truss lattice structure with broadband vibration reduction function according to the present invention.

[0024] FIG. 1( b ) is an isometric view of a gradient micro-truss lattice structure with broadband vibration reduction function according to the present invention.

[0025] Figure 2 It is a front view of a gradient micro-truss lattice structure with broadband vibration reduction function of the present invention, wherein a) configuration 1, b) configuration 2;

[0026] Figure 3 It is a left view of a gradient micro-truss lattice structure with broadband vibration reduction function of the present invention, wherein a) configuration 1, b) configuration 2;

[0027] Figure 4 It is a typical vibration response transfer function curve of a gradient micro-truss lattice structure with a wide-band vibration reduction function of the present invention.

[0028] In the figure: 1 load-bearing panel, 2 load-bearing frame, 3 gradient micro-truss lattice cell. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] In an embodiment of the present invention, a gradient micro-truss lattice structure with a broadband vibration reduction function includes a load-bearing panel 1, a load-bearing frame 2 and a gradient micro-truss lattice cell 3.

[0031] The load-bearing panel 1 includes an upper and lower panel, which bears the load in the surface during the use of the structure, and the typical size of the panel is 1mm;

[0032] The load-bearing frame 2 is a cubic frame connected to the upper and lower panels, and bears the lateral, longitudinal and out-of-plane loads during the use of the structure. The typical diameter of the frame is 1 mm.

[0033] The gradient micro-truss lattice cell 3 is divided into two types, one is a central spherical vibration damper, and the other is a central cantilever hanging ball vibration damper. Both vibration dampers are connected to the nodes of the supporting frame 2 through a micro-truss (typical diameter is 0.6mm, 0.8mm), and are not connected to the upper and lower panels. The concentrated mass body in the gradient micro-truss lattice cell 3 cooperates with the micro-truss to play a role in vibration dissipation.

[0034] The load-bearing panel 1, the load-bearing frame 2 and the gradient micro-truss lattice cell 3 are integrally formed by an additive manufacturing process, and the material is the same, and typical materials are aluminum alloy, titanium alloy and stainless steel.

[0035] The central spherical vibration damper refers to a sphere in each gradient micro-truss lattice cell 3, and two ends of the sphere are respectively connected to the diagonally connected micro-trusses in the gradient micro-truss lattice cell 3.

[0036] The central cantilever hanging ball vibration damper means that there are two spheres in each gradient micro-truss lattice cell 3, and the two spheres are respectively connected to the two ends of a transverse micro-truss, and the center of the transverse micro-truss is fixed by connecting the diagonal micro-trusses of the gradient micro-truss lattice cell 3.

[0037] Specifically, as a preferred embodiment of the present invention. The load-bearing panel 1, the load-bearing frame 2 and the gradient micro-truss lattice cell 3 are integrated into one by an additive manufacturing process, and can be used as a load-bearing-vibration-damping structure after necessary post-processing. When the lattice structure is in operation, the vibration load is transmitted from outside or inside the plane, and part of the energy will be dissipated by the resonance of the mass body in the lattice structure through the micro-truss lattice structure, thereby reducing the vibration load. By designing the size and material of the mass body and its support rods in the lattice structure, the frequency of the local resonance is controlled, so that the load amplitude at the corresponding frequency in the vibration load can be targetedly reduced, and a wide-band vibration reduction function can be achieved through a gradient design. At the same time, the upper and lower load-bearing panels and the load-bearing frame can withstand static loads to achieve the integration of load-bearing and vibration reduction. The vibration response transfer function curve of a typical gradient micro-truss lattice structure obtained by simulation is shown as follows: Figure 4 shown.

[0038] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A gradient micro-truss lattice structure with broadband vibration reduction function, characterized in that: It comprises a load-bearing panel (1), a load-bearing frame (2) and a gradient micro-truss lattice cell (3); The load-bearing panel (1) comprises an upper and a lower panel, which bears the load within the surface during use of the structure; The load-bearing frame (2) is a cubic frame connected to the upper and lower panels, and bears the lateral, longitudinal and out-of-plane loads during the use of the structure; The gradient micro-truss lattice cell (3) is divided into two types, one is a central spherical vibration damper, and the other is a central cantilever hanging ball vibration damper. Both vibration dampers are connected to the nodes of the micro-truss and the bearing frame (2), and are not connected to the upper and lower panels. The concentrated mass body in the gradient micro-truss lattice cell (3) cooperates with the micro-truss to play a role in vibration dissipation. The load-bearing panel (1), the load-bearing frame (2) and the gradient micro-truss lattice cell (3) are integrally formed by an additive manufacturing process and are made of the same material, typically aluminum alloy, titanium alloy, stainless steel and the like.

2. The gradient micro-truss lattice structure with broadband vibration reduction function according to claim 1, characterized in that: The central spherical vibration damper refers to a sphere in each gradient micro-truss lattice cell (3), and the two ends of the sphere are respectively connected to the diagonally connected micro-trusses in the gradient micro-truss lattice cell (3).

3. The gradient micro-truss lattice structure with broadband vibration reduction function according to claim 1, characterized in that: The central cantilever hanging ball vibration damper means that each gradient micro-truss lattice cell (3) has two spheres, the two spheres are respectively connected to the two ends of a transverse micro-truss, and the center of the transverse micro-truss is fixed by connecting the diagonal micro-trusses of the gradient micro-truss lattice cell (3).

4. The gradient micro-truss lattice structure with broadband vibration reduction function according to claim 1, characterized in that: By designing the size and material of the sphere and its microtruss in a gradient microtruss lattice structure with broadband vibration reduction function, the frequency of local resonance is controlled, thereby specifically reducing the load amplitude at the corresponding frequency in the vibration load, and realizing broadband vibration reduction function through gradient design.

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