Non-newtonian fluid composite structure

Abstract

The application provides a non-Newtonian fluid composite structure, which comprises a main body formed by smoothly extending a starting section along a predetermined three-dimensional spiral curve to a terminal section; and cavities continuously distributed inside the main body and filled with shear thickening non-Newtonian fluid. Further, the starting section and the terminal section are coaxially arranged. The main body adopts a continuously gradual change form of extending the starting section along the three-dimensional spiral curve to the terminal section, the internal cavities are completely filled with the shear thickening non-Newtonian fluid, the three-dimensional spiral structure enhances the shear path of the fluid, improves the energy dissipation efficiency, the flexible main body allows automatic recovery after deformation, and the passive adaptive characteristic is superior to that of magneto-rheological fluid / electro-rheological fluid.

Description

Technical Field

[0001] This invention relates to the field of damping energy dissipation technology, specifically to a non-Newtonian fluid composite structure. Background Technology

[0002] In the field of engineering vibration control and energy dissipation, damping technology, as a core means of suppressing structural vibration and absorbing impact energy, is widely used in scenarios such as building seismic resistance, mechanical vibration reduction, vehicle suspension, and precision instrument protection. Traditional passive damping devices mainly rely on the following two types of technologies: hydraulic dampers: based on the viscosity effect of Newtonian fluids (such as silicone oil) to achieve energy dissipation, but their linear response characteristics make it difficult to adapt to the dynamic load requirements of wide frequency range and variable amplitude, and they are prone to fluid leakage or sealing failure under extreme impacts.

[0003] Viscoelastic material dampers utilize the hysteretic properties of polymer materials to absorb energy, but they are prone to material fatigue under long-term cyclic loading, resulting in insufficient performance stability and difficulty in achieving compatibility with both high-frequency and low-frequency vibrations. In recent years, smart materials (such as magnetorheological fluids and electrorheological fluids) have achieved active control of damping characteristics by regulating fluid viscosity through external magnetic or electric fields. However, this technology has significant drawbacks: reliance on external energy supply: continuous power or magnetic supply is required, resulting in high system complexity and a risk of failure during power outages; response delay and electromagnetic interference: the transmission and execution of external control signals are delayed, making it difficult to meet the real-time control requirements of transient impacts, while electromagnetic interference may affect the operation of precision equipment.

[0004] Non-Newtonian fluids, due to their unique rheological properties (such as shear thickening or shear thinning effects), offer a new direction for passive adaptive damping technology. However, existing non-Newtonian fluid damping structures still suffer from the following technical bottlenecks: Structural design limitations: Most employ a closed design with a rigid cavity and piston, leading to uneven fluid distribution, local stress concentration, and piston movement easily causing seal failure; Lack of self-resetting capability: Traditional rigid structures cannot return to their initial shape after load removal, making it difficult to meet long-term stability requirements under cyclic loads; Manufacturing process constraints: Complex cavity structures are difficult to seal with high precision using conventional processing techniques, limiting the performance of non-Newtonian fluids.

[0005] To address the aforementioned issues, a novel composite structure is urgently needed. Through the synergistic optimization of materials and geometric design, this structure can overcome the limitations of existing damping technologies and achieve a passive, adaptive, highly reliable, and self-resetting energy dissipation mechanism. Summary of the Invention

[0006] To address the technical problems existing in the background art, the present invention proposes a non-Newtonian fluid composite structure, characterized in that it comprises:

[0007] The main body is formed by smoothly extending a predetermined three-dimensional spiral curve from a starting section to a terminating section;

[0008] The cavity is continuously distributed along the interior of the main body and filled with a shear-thickening non-Newtonian fluid.

[0009] Furthermore, the starting section and the ending section are arranged coaxially.

[0010] Furthermore, it also includes: a base, two sealing plugs, and an end cap; the main body is mounted on the base, and the end cap is mounted on the end of the main body away from the base.

[0011] Furthermore, the base and the main body are connected by three protruding support columns on the base. The protruding support columns are fixed and limited to the side of the main body by side plates, and the upper surface of the protruding support columns of the base is attached to the lower surface of the main body and fixed by glue. The connection method between the end cap and the main body is the same as that of the base.

[0012] Furthermore, the geometry of the three-dimensional helical curve is defined by the following parametric equation:

[0013]

[0014] Where t∈[t1, t2], t1=0, And A = 50, k = 5, C = 6, m = 17.5.

[0015] Furthermore, the non-Newtonian fluid completely fills the interior of the host, and under dynamic load, it achieves a nonlinear increase in viscosity through a shear thickening effect.

[0016] Furthermore, the sealing plug is interference-fitted with the port of the main body and sealed and fixed with glue.

[0017] Furthermore, the main body is prepared by selective laser sintering (SLS) and the material is thermoplastic polyurethane elastomer (TPU); the base and end cap are prepared by fused deposition modeling (FDM) and the material is polylactic acid (PLA).

[0018] Furthermore, the upper end of the end cap is provided with a structural interface for attaching a support platform.

[0019] Furthermore, the composite structure is a passive damping system that achieves adaptive energy dissipation under dynamic loads through the shear thickening effect of non-Newtonian fluids, and automatically recovers after the load is removed, without the need for external energy drive.

[0020] The beneficial effects of this invention are as follows: the main body adopts a continuous and gradual shape with the starting section extending along a three-dimensional spiral curve to the ending section; the internal cavity is completely filled with a shear-thickening non-Newtonian fluid; the three-dimensional spiral structure enhances the fluid shear path and improves energy dissipation efficiency; the flexible main body allows for automatic recovery after deformation; and the passive adaptive characteristics are superior to those of magnetorheological fluid / electrorheological fluid. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a non-Newtonian fluid composite structure according to the present invention;

[0022] Figure 2 This is a cross-sectional view of the present invention;

[0023] Figure 3 This is a schematic diagram of the sealing plug.

[0024] Figure 4 A structural diagram of the main body;

[0025] Figure 5 This is a schematic diagram of the base structure;

[0026] Figure 6 This is a schematic diagram of the top cover structure. Detailed Implementation

[0027] Reference Figure 1-6 This invention proposes a non-Newtonian fluid composite structure, characterized by comprising: a main body 2, formed by a smooth extension of a predetermined three-dimensional helical curve from an initial cross-section to a terminal cross-section; and a cavity, continuously distributed within the main body and filled with a shear-thickening non-Newtonian fluid 5. The main body 2 adopts a continuously gradient shape extending from the initial cross-section along a three-dimensional helical curve to the terminal cross-section. The internal cavity is completely filled with the shear-thickening non-Newtonian fluid 5. The three-dimensional helical structure enhances the fluid shear path, improving energy dissipation efficiency. The flexible main body allows for automatic recovery after deformation, exhibiting passive adaptive characteristics superior to magnetorheological / electrorheological fluids.

[0028] Furthermore, the starting section and the ending section are arranged coaxially. The coaxial design ensures the consistency of load transfer direction, avoids stress concentration caused by eccentric loads, and ensures the axial symmetry of the shear thickening effect.

[0029] Furthermore, it also includes: a base 1, two sealing plugs 3, and an end cap 4; the main body 2 is mounted on the base 1, and the end cap 4 is mounted on the end of the main body 2 away from the base 1. Both the base and the end cap are manufactured using FDM technology, the sealing plugs are interference-fitted and sealed with glue, modular assembly improves maintainability, and the end cap 4 can be attached to a support platform.

[0030] Furthermore, the base 1 and the main body 2 are connected by three protruding support columns on the base 1. The protruding support columns are fixed and limited to the sides of the main body 2 by side plates, and the upper surface of the protruding support columns of the base 1 is attached to the lower surface of the main body 2 and fixed with glue. The end cap 4 is connected to the main body 2 in the same way as the base 1. The protruding support column side plate limiting design and glue fixing process ensure interface strength, the three-dimensional limiting avoids radial displacement of the main body, and the symmetrical design ensures the consistency of the load transmission path.

[0031] Furthermore, the geometry of the three-dimensional helical curve is defined by the following parametric equation:

[0032]

[0033] Where t∈[t1, t2], t1=0, And A = 50, k = 5, C = 6, m = 17.5.

[0034] Parametric design enables complex flow channel topologies, and mathematical controllability facilitates performance optimization.

[0035] Furthermore, the non-Newtonian fluid 5 completely fills the interior of the main body 2, and its viscosity is nonlinearly increased under dynamic loads through a shear thickening effect. It exhibits wide-frequency adaptive characteristics and a solid-like transformation under impact loads.

[0036] Furthermore, the sealing plug 3 and the port of the main body 2 are interference-fitted and sealed with adhesive. This double seal ensures no fluid leakage and is suitable for flexible body deformation requirements. It also provides reliable sealing under long-term cyclic loading and is compatible with dynamic deformation of the main body.

[0037] Furthermore, the main body 2 is fabricated using selective laser sintering (SLS) technology, and the material is thermoplastic polyurethane elastomer (TPU); the base 1 and end cap 4 are fabricated using fused deposition modeling (FDM) technology, and the material is polylactic acid (PLA). This demonstrates the ability to form integrated complex structures, with a gradient material stiffness design (synergistic effect of a rigid PLA frame + a flexible TPU main body).

[0038] Furthermore, the upper end of the end cap 4 is provided with a structural interface for attaching a support platform.

[0039] Furthermore, the composite structure is a passive damping system that achieves adaptive energy dissipation under dynamic loads through the shear thickening effect of the non-Newtonian fluid 5, and automatically recovers after the load is removed, without the need for external energy drive.

[0040] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A non-Newtonian fluid composite structure, characterized in that, include: The main body (2) is formed by smoothly extending a predetermined three-dimensional spiral curve from the starting section to the ending section; The cavity is continuously distributed along the interior of the body and filled with a shear-thickening non-Newtonian fluid (5).

2. The non-Newtonian fluid composite structure according to claim 1, characterized in that, The starting section and the ending section are arranged coaxially.

3. The non-Newtonian fluid composite structure according to claim 1, characterized in that, Also includes: The body (2) is mounted on the base (1), two sealing plugs (3) and an end cap (4); the body (2) is mounted on the base (1) and the end cap (4) is mounted on the end of the body (2) away from the base (1).

4. The non-Newtonian fluid composite structure according to claim 3, characterized in that, The base (1) and the main body (2) are connected by three protruding support columns on the base (1). The protruding support columns are fixed and limited to the side of the main body (2) by side plates. The upper surface of the protruding support columns of the base (1) is attached to the lower surface of the main body (2) and fixed by glue. The end cap (4) is connected to the main body (2) in the same way as the base (1).

5. The non-Newtonian fluid composite structure according to claim 1, characterized in that, The geometry of the three-dimensional helical curve is defined by the following parametric equation: Where t∈[t1, t2], t1=0, And A = 50, k = 5, C = 6, m = 17.

5.

6. The non-Newtonian fluid composite structure according to claim 1, characterized in that, The non-Newtonian fluid (5) completely fills the interior of the main body (2), and under dynamic load, it achieves nonlinear viscosity enhancement through shear thickening effect.

7. The non-Newtonian fluid composite structure according to claim 3, characterized in that, The sealing plug (3) is fitted with the port of the main body (2) by an interference fit and is sealed and fixed with glue.

8. The non-Newtonian fluid composite structure according to claim 1, characterized in that, The main body (2) is prepared by selective laser sintering (SLS) and the material is thermoplastic polyurethane elastomer (TPU); the base (1) and end cap (4) are prepared by fused deposition modeling (FDM) and the material is polylactic acid (PLA).

9. The non-Newtonian fluid composite structure according to claim 3, characterized in that, The end cap (4) has a structural interface for attaching a support platform at its upper end.

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