A sandwich beam structure with a gap hinge having broadband vibration damping performance

Abstract

The application discloses a kind of wideband vibration damping performance sandwich beam structure with gap hinge, including first substructure and second substructure, first substructure and second substructure are combined by gap hinge;First substructure and second substructure are combined by periodic arrangement in one-dimensional space by unit cell;Unit cell is sandwich beam structure, and each sandwich beam structure includes two layers of high-strength beam and intermediate lightweight sandwich layer;Wideband vibration damping performance sandwich beam structure with gap hinge is assembled by using slot design to sandwich layer and two layers of high-strength beam.The reasonable distribution of gap makes the structure be able to provide flexible response under low-frequency vibration, effectively reduces the influence of low-frequency vibration;The setting of hinge point enhances the local rigidity of the structure when high-frequency vibration, so as to realize efficient vibration damping in wide frequency range.The position and quantity of gap and hinge point are optimized by finite element analysis, to ensure that the best damping effect can be obtained under different vibration frequencies.

Description

Technical Field

[0001] This invention belongs to the field of mechanical vibration and noise control technology, and particularly relates to a gapped hinged sandwich beam structure with wideband vibration reduction performance. Background Technology

[0002] The rapid development of national science and technology has driven rapid social progress, leading to significant breakthroughs in many fields and the emergence of various high-precision technological equipment. Vibration issues, however, affect the use of many of these devices, ranging from affecting accuracy to causing serious damage. It can be said that the impact of vibration needs to be considered in every field, especially in engineering and daily life, where vibration control is a crucial issue. Various mechanical systems and structures, such as those in aerospace, automobiles, bridges, and buildings, are subject to vibrations of varying frequencies and amplitudes. Prolonged exposure to vibration environments not only accelerates structural fatigue and damage but also affects system performance and lifespan. Therefore, developing structural forms with efficient vibration control capabilities has become a research hotspot.

[0003] Currently, there are four main research methods for vibration suppression: active control, passive control, semi-active control, and hybrid control. Active control requires external energy, resulting in high energy consumption, complexity, high cost, and poor reliability. Passive control is limited by its unsatisfactory effect on low-frequency vibration reduction and its inability to flexibly adjust the frequency range, especially for large-area plate and shell structures. Semi-active control, as a composite system, still faces stability and cost issues and is not yet mature. In conclusion, continuous research into new vibration reduction and noise reduction methods remains a hot topic in the field.

[0004] Sandwich beam structures exhibit superior vibration control performance due to their unique sandwich design. A sandwich beam typically consists of two rigid beams and a lightweight core material. This structure not only possesses high strength and stiffness but also effectively attenuates vibrations through the damping effect of the core layer. However, traditional sandwich beams still have limitations in handling broadband vibrations, primarily because the natural frequencies of a single core material are limited, making it difficult to cover vibration control needs across a wide frequency range. To address this issue, gap-hinged sandwich beam structures have emerged. This structure introduces gaps and hinges at the connection points of the two sandwich beams, enabling the beams to generate multiple modal resonances at different frequencies, thus significantly improving the frequency range of vibration control. Specifically, the gaps allow the sandwich beams to provide better flexibility at low frequencies, while the hinges enhance the local rigidity of the structure at high frequencies, effectively reducing vibrations across a wide frequency range. The core technology of gap-hinged sandwich beam structures lies in their innovative geometric design and material combination. This structural design not only needs to consider the mechanical properties and vibration reduction effect of the beams but also comprehensively consider the structure's weight, manufacturing cost, and maintainability. By rationally designing the distribution of gaps and the location of hinge points, vibration energy can be dispersed and absorbed, significantly improving the overall vibration reduction performance of the structure. In recent years, with the advancement of materials science and manufacturing technology, gapped hinged sandwich beam structures have shown broad prospects in engineering applications. For example, in the aerospace field, this structure can effectively reduce the weight of aircraft and improve their vibration resistance; in the automotive industry, it can be used to manufacture more comfortable and safer body structures; and in building engineering, it can be used for the seismic design of bridges and high-rise buildings.

[0005] In summary, the gapped hinged sandwich beam structure demonstrates great potential and advantages in broadband vibration reduction, representing an innovative structural form with significant application value. Its technical background not only encompasses cutting-edge knowledge from multiple disciplines such as materials science, structural mechanics, and vibration control, but also requires comprehensive consideration of various factors in practical engineering applications, thus possessing high research and development value. Summary of the Invention

[0006] The technical problem that this invention aims to solve is:

[0007] Wideband vibration control: Traditional sandwich beam structures have limited vibration reduction effects in the high-frequency or low-frequency range and cannot cover a wide frequency range. By introducing gaps and hinge points at the connection between the two sandwich beams, the structure can generate multiple modal resonances at different frequencies, significantly improving the vibration reduction effect and covering a wider frequency range.

[0008] Vibration energy dispersion and absorption: Single materials and structural forms have limited ability to absorb and disperse vibration energy, easily leading to localized stress concentration and structural fatigue. Gap-jointed hinge designs, through the rational distribution of gaps and hinge points, allow vibration energy to be more effectively dispersed and absorbed within the beam, reducing stress concentration and fatigue damage.

[0009] Balancing structural flexibility and rigidity: A balance between structural flexibility and rigidity is required for low-frequency and high-frequency vibration control, a balance that traditional designs struggle to achieve. Gap elements provide a flexible response under low-frequency vibrations, while hinge points enhance the local rigidity of the structure under high-frequency vibrations, thus optimizing performance across different vibration frequencies.

[0010] Balancing weight reduction and strength: In vibration reduction design, it is often necessary to balance the weight and strength of the structure. Traditional sandwich beams may reduce overall strength and stiffness while reducing weight. The gapped hinged sandwich beam structure, through innovative design, can improve the strength and stiffness of the structure without significantly increasing weight, while achieving efficient vibration reduction.

[0011] Manufacturing and maintenance costs: Complex vibration damping structure designs can lead to increased manufacturing and maintenance costs. This structure, through optimized design, achieves simple manufacturing processes and convenient maintenance methods, controlling manufacturing and maintenance costs and making it practically applicable.

[0012] Multimodal resonance control: Traditional vibration reduction structures struggle to control multiple modal resonances simultaneously, leading to unstable vibration reduction effects. Through clever design of gaps and hinge points, the structure can effectively resonate in different modes, thereby improving the stability and reliability of the vibration reduction effect.

[0013] Material selection and optimization: Different materials exhibit varying performance in terms of vibration reduction, weight, and cost, necessitating optimized combinations. By incorporating advanced materials science, materials suitable for gapped hinged sandwich beam structures are selected and optimized to enhance overall performance.

[0014] The technical solution of this invention is a gapped hinged sandwich beam structure with wide-frequency vibration reduction performance. Each sandwich beam structure is composed of a unit cell arranged periodically to form a sandwich beam substructure. For each unit cell, a slotted design is used to assemble the core layer with the upper and lower beam layers. The entire gapped hinged sandwich beam is assembled from two substructure sandwich beam structures via a gapped hinge system. The gapped hinges are assembled using gapped rotary hinges, transverse springs, and torsion springs. This structure exhibits wide-frequency vibration reduction performance.

[0015] The specific technical solution is as follows:

[0016] The base material of the gapped hinged sandwich beam is a metal material, which is prepared by mechanical processing methods such as casting and wire cutting.

[0017] The upper and lower beams of the hinged sandwich beam with gap are cuboid beams with slots with through holes. The slot size is fixed to facilitate the universality of the parts. At the same time, the beam length can be customized by connecting the individual cells through slots.

[0018] The core structure of each unit cell of the gapped hinged sandwich beam structure consists of diagonal bars with a circular cross-section radius of 0.5 cm, connected by cylindrical pins, and arranged periodically in one-dimensional space for easy assembly and disassembly. The core layer and the upper and lower beams are fixed with bolts, and different engineering requirements can be met by disassembling and replacing the core layer structure with the same model.

[0019] Further regarding the design of the gaps, the gap distribution is as follows: gap hinges are installed at the connection points of the two sandwich beam substructures, with the left substructure having a fixed rotary hinge and the right substructure having fixed transverse and torsional springs. The size and shape of the gaps, as well as the spring stiffness, can be optimized according to the target vibration frequency range. The function of the gaps is to allow the structure to undergo local deformation under low-frequency vibrations, providing a flexible response and effectively reducing the impact of low-frequency vibrations. Hinge point locations are designed at specific locations on the upper and lower beams or the core layer at the connection points of the two sandwich beams. These hinge points can be fixed or adjustable. The location of the hinge points is optimized based on the modal analysis results of the structure to ensure enhanced local stiffness under high-frequency vibrations. The function of the hinge points is to enhance the structural stiffness under high-frequency vibrations by limiting excessive deformation in local areas, thereby providing effective vibration control over a wide frequency range.

[0020] Compared with existing technologies, the present invention designs a gapped hinged sandwich beam structure with wideband vibration reduction performance, which has the following beneficial effects:

[0021] (1) Superior wideband vibration reduction performance: By introducing gaps and hinges at the connection of the two sandwich beams, the present invention can effectively reduce vibration in both low and high frequency ranges. The gaps provide a flexible response to low-frequency vibrations, while the hinges enhance the rigidity of the structure under high-frequency vibrations, thereby achieving wideband vibration control.

[0022] (2) Effective dispersion and absorption of vibration energy: The rational design of gaps and hinges enables vibration energy to be effectively dispersed and absorbed within the structure, avoiding local stress concentration, reducing fatigue damage to the structure, and improving the durability of the structure.

[0023] (3) Improve the overall performance of the structure: The gapped hinge design not only improves the vibration reduction effect, but also enhances the strength and rigidity of the structure without significantly increasing the weight, while maintaining the advantages of high strength and light weight.

[0024] (4) Flexible design and adaptability: The position and number of gaps and hinge points can be flexibly adjusted according to specific vibration control requirements to adapt to different application scenarios and vibration frequency ranges. This flexibility makes the invention widely adaptable in various engineering fields.

[0025] (5) Reduced manufacturing and maintenance costs: Through optimized design, this invention simplifies the manufacturing process and reduces assembly steps, thereby reducing manufacturing costs. At the same time, the reasonable structural design also facilitates maintenance, reducing maintenance costs and difficulties.

[0026] (6) Enhanced comfort and safety: In aerospace and automotive industry applications, this invention significantly reduces vibration impact, improving the comfort and safety of aircraft and vehicles. In building engineering, it enhances the structure's vibration resistance under dynamic loads such as earthquakes, improving the safety and durability of buildings.

[0027] (7) Wide Applicability: The gapped hinged sandwich beam structure of this invention can be applied to multiple fields such as aerospace, automotive, construction, and bridges, and has broad application prospects. Introducing gaps and hinge points into the sandwich beam structure of aircraft wings: This significantly reduces wing vibration over a wide frequency range, improving flight stability and comfort. Introducing gaps and hinge points into the sandwich beam structure of automobile chassis and body: This effectively reduces the impact of road vibration on vehicles, improving driving comfort and safety. Using the gapped hinged sandwich beam design in the critical load-bearing structures of bridges and high-rise buildings: This improves the structure's vibration resistance under dynamic loads such as earthquakes, enhancing structural safety and durability.

[0028] (8) Strong environmental adaptability: The structural design of this invention takes into account the application requirements under different environmental conditions, has good environmental adaptability, and can maintain stable performance in harsh environments.

[0029] (9) Improve the fatigue life of the structure: Due to the effective dispersion and absorption of vibration energy and the reduction of local stress concentration, the present invention significantly improves the fatigue life of the structure and extends the service life.

[0030] (10) High material utilization efficiency: By precisely designing the position and size of gaps and hinge points, the present invention achieves efficient material utilization and improves the economy and environmental friendliness of the structure.

[0031] The gapped hinged sandwich beam structure of the present invention provides an efficient, reliable and economical broadband vibration reduction solution, demonstrating significant technical advantages and application potential in multiple engineering fields. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the gapped hinged sandwich beam of the present invention.

[0033] Figure 2 This is a schematic diagram of the unit cell 1 of the present invention.

[0034] Figure 3 This is a schematic diagram of substructure 2 of the present invention.

[0035] Figure 4 This is a schematic diagram of substructure 3 of the present invention.

[0036] Figure 5 This is a schematic diagram of the core layer 4 of the present invention.

[0037] Figure 6 This is a schematic diagram of the upper and lower beams 5 of the present invention.

[0038] Figure 7 This is a schematic diagram of the gap rotary hinge structure 6 of the present invention.

[0039] Figure 8 This is a schematic diagram of the transverse spring 7 of the present invention.

[0040] Figure 9 This is a schematic diagram of the torsion spring 8 of the present invention.

[0041] Figure 10 This is a schematic diagram of the lateral and torsional spring rotary hinge system with gap of the present invention.

[0042] Figure 11 This is a schematic diagram comparing the vibration reduction performance of the present invention with that of a traditional single-beam hinged structure. Detailed Implementation

[0043] It should be understood that the specific preferred embodiments described herein are for explanation and illustration only and are not intended to limit the invention. The specific usage of the invention will be further described below with reference to the accompanying drawings:

[0044] like Figure 1-10 As shown, a gapped hinged sandwich beam structure with wideband vibration reduction performance includes a first substructure 2 and a second substructure 3, which are combined by a gapped hinge. The first substructure 2 and the second substructure 3 are formed by periodically arranging unit cells 1 in one-dimensional space. The unit cell 1 is a sandwich beam structure, and each sandwich beam structure includes upper and lower high-strength beams 5 and a middle lightweight core layer 4. A slotted design is used to assemble the core layer 4 with the upper and lower high-strength beams 5.

[0045] The first substructure 2 and the second substructure 3 are sequentially connected by a rigid connector and a variable flexible connector. The rigid connector is a gap-joint rotary hinge structure 6. The variable flexible connector is a transverse spring 7 and a torsion spring 8. The transverse spring 7 is arranged transversely along the first substructure 2 and the second substructure 3, and the torsion spring 8 is arranged vertically along the first substructure 2 and the second substructure 3. The transverse spring 7 and the torsion spring 8 are arranged vertically correspondingly. The gap-joint rotary hinge structure 6 is the hinge point of a gap-joint sandwich beam structure. The gap distribution of the transverse spring 7 and the torsion spring 8 in the gap-joint sandwich beam structure.

[0046] Furthermore, the gap distribution configuration enables the gapped hinged sandwich beam structure to provide a flexible response in the low-frequency vibration range (0Hz-200Hz), effectively reducing the impact of low-frequency vibrations. The hinge points enhance the local rigidity of the gapped hinged sandwich beam structure during high-frequency vibrations, thereby achieving efficient vibration reduction over a wide frequency range (100Hz-600Hz). Finite element analysis is used to optimize the gap distribution and the position and number of hinge points, ensuring that the gapped hinged sandwich beam structure achieves optimal vibration reduction at different vibration frequencies (50Hz-125Hz), (530Hz-600Hz), and (814Hz-897Hz).

[0047] Furthermore, the connection between the sandwich layer 4 and the high-strength beam 5 is fixed by bolts and nuts.

[0048] Furthermore, the base materials of the first substructure 2, the second substructure 3, and the gap rotary hinge structure 6 are metal materials, which are prepared by mechanical processing methods such as casting and wire cutting.

[0049] Furthermore, the high-strength beam 5 is a cuboid beam with a slot with through holes. The size of the slot is fixed to facilitate versatility. At the same time, the individual cells 1 are connected by slots to allow for customization of the beam length.

[0050] Furthermore, the sandwich layer 4 is composed of a multi-slanted bar platform with a circular cross-section radius of 0.5cm. The top of the multi-slanted bar platform is a frustum structure, with the multiple slanted bars converging into a frustum. The bottom of the multi-slanted bar platform is a distribution structure with mounting brackets, and each mounting bracket cooperates with and is fixed to the slot of the high-strength beam 5.

[0051] Furthermore, the sandwich layer 4 and the high-strength beam 5 are fixed together by bolts, and different engineering requirements can be met by disassembling and replacing the sandwich layer 4 with the same model.

[0052] Furthermore, it is necessary to first select an appropriate number of first substructures 2 and second substructures 3 to meet the actual engineering requirements. The sandwich layer 4 is installed onto the upper and lower high-strength beams 5 and fixed with bolts and nuts to assemble unit cells 1. The unit cells 1 are periodically combined and connected via slots to form the first substructures 2 and second substructures 3. Finally, the first substructures 2 and second substructures 3 are combined into a whole gap-hinged sandwich beam structure via a gap-rotating hinge structure 6, a transverse spring 7, and a torsion spring 8. During subsequent adjustments or maintenance, the gap-hinged sandwich beam structure can be quickly disassembled and reassembled with a hexagonal core layer, a quadrilateral sandwich layer, a thin I-beam sandwich layer, or a thick I-beam sandwich layer, enabling universal parts replacement.

[0053] Furthermore, to verify the hinged sandwich beam structure with gap, its modal functions were calculated using the Rayleigh-Ritz method, yielding the following modal functions and eigenvalue equations:

[0054] (1)

[0055] ω represents the natural frequency of the gapped hinged sandwich beam structure, (K1+K2) represents the total stiffness matrix of the gapped hinged sandwich beam structure, M represents the total mass matrix of the gapped hinged sandwich beam structure, and X represents the generalized coordinate vector of the gapped hinged sandwich beam structure. When ω 2 When M=(K1+K2), the gapped hinged sandwich beam structure reaches an equilibrium state at a certain frequency. That is, the ω obtained at this time is the natural frequency of the gapped hinged sandwich beam structure under natural vibration.

[0056] The presence of a gap leads to irregular forces and displacements at the joints in the hinge. When the journal and bearing are not in contact at the structural gap, the hinge structure becomes a "free motion" state, and the force and displacement constraints in the hinge disappear. When the relative displacement between the journal and bearing at the gap exceeds the gap, the hinge structure becomes a "contact collision" state. This contact-separation state causes the forces and displacements at the gap to be transmitted intermittently, which can be represented by a piecewise function as follows:

[0057] (2a)

[0058] (2b)

[0059] w1 represents the lateral displacement of the sandwich beam in the first substructure, and w2 represents the lateral displacement of the sandwich beam in the second substructure. 1c w represents the instantaneous lateral displacement at contact of the sandwich beam of the first substructure. 2c The instantaneous lateral displacement at contact of the sandwich beam of the second substructure is represented by w2−w1−w 2c +w 1cThe physical meaning lies in describing the difference in lateral displacement between the first and second substructure sandwich beams when a gap exists. θ1 represents the angular displacement of the first substructure sandwich beam, and θ2 represents the angular displacement of the second substructure sandwich beam. 1c θ represents the instantaneous angular displacement at contact of the sandwich structure of the first substructure. 2c The instantaneous contact angular displacement of the sandwich beam of the second substructure is represented by θ2−θ1−θ 2c +θ 1c The physical significance lies in describing the difference in angular displacement between two sandwich beams when a gap exists. This analysis helps to understand the behavior and response of structures under dynamic conditions, and is of great importance to engineering design and analysis.

[0060] The complex dynamic equations of the hinged sandwich beam structure with gap are as follows:

[0061] (3a)

[0062] (3b)

[0063] Based on the above equations, the dynamic characteristics and vibration reduction performance of the gapped hinged sandwich beam structure can be obtained.

[0064] M represents the total mass matrix of the hinged sandwich beam structure with gaps, (K b +K j C represents the overall stiffness matrix of the hinged sandwich beam structure with gap, and C represents the damping matrix of the hinged sandwich beam structure with gap. j Let represent the damping matrix of the hinged sandwich beam structure with gap. The physical meaning of equation (3a) is to describe the dynamic equation of the two sandwich beams in the non-contact state of the hinge. According to this equation, the vibration characteristics of the hinged sandwich beam structure in the non-contact state of the hinge can be obtained. The physical meaning of equation (3b) is to describe the dynamic equation of the two sandwich beams in the contact collision state of the hinge. According to this equation, the vibration characteristics of the hinged sandwich beam structure in the contact collision state of the hinge can be obtained.

[0065] Example

[0066] This invention designs a gapped hinged sandwich beam structure with wide-frequency vibration reduction performance. The structure comprises two layers of high-strength beams and a lightweight core layer. A slotted design assembles the core layer with the upper and lower beam layers. Several gaps and hinge points are designed between the panel and the core layer at the connection points of the two sandwich beams. The rational distribution of gaps allows the structure to provide a flexible response under low-frequency vibrations, effectively reducing the impact of low-frequency vibrations; the hinge points enhance the local rigidity of the structure during high-frequency vibrations, thus achieving efficient vibration reduction over a wide frequency range. Finite element analysis is used to optimize the position and number of gaps and hinge points, ensuring that the structure achieves optimal vibration reduction at different vibration frequencies.

[0067] First, a suitable number of parts need to be selected to meet the actual engineering requirements. The core layer is installed onto the upper and lower beams and fixed with bolts and nuts to assemble unit cells. These unit cells are then periodically assembled to form substructures. All substructures are connected by gapped hinges to form a complete gapped hinged sandwich beam structure. Two substructures are connected by gapped hinges. The unit cells use a slotted design to assemble the core layer with the upper and lower beams. The left and right sandwich beams are each composed of multiple unit cells arranged periodically and then connected by gapped hinges, resulting in good vibration reduction. The specific implementation method is as follows:

[0068] The base material of the gapped hinged sandwich beam is a metal material, which is prepared by mechanical processing methods such as casting and wire cutting.

[0069] The upper and lower beams of the hinged sandwich beam with gap are rectangular beams with slots with through holes. The slot size is fixed to facilitate the universality of the parts. At the same time, the beams are connected by slots to customize the beam length.

[0070] The core structure of each unit cell of the gapped hinged sandwich beam consists of a diagonal bar with a circular cross-section radius of 0.5 cm, which together with the upper and lower beams form an integral unit cell. The unit cells are then periodically assembled to form two substructures. Finally, the two substructures are connected and combined into a gapped hinged sandwich beam through a gapped hinge system.

[0071] The gap hinge structure of the sandwich beam with gap is assembled by a rotary hinge, a transverse spring, and a torsion spring. The size of the gap and the stiffness of the spring can be adjusted. In engineering practice, the required gap size and the required stiffness of the spring can be calculated theoretically before processing and assembly.

[0072] In the entire sandwich beam structure, the core layer structure is replaced to make the installation of these components convenient and easy to adjust. All the materials used are common materials, which are inexpensive and easy to process. This structural specimen can not only provide a correct basis for verifying the theory and simulation results, but can also be widely used in engineering and life, and has excellent vibration reduction effect.

[0073] The gapped hinged sandwich beam structure of this invention not only possesses superior broadband vibration reduction performance but also effectively disperses and absorbs vibration energy, reduces stress concentration, and improves the overall strength and durability of the structure. Simultaneously, this design boasts high material utilization efficiency and simple manufacturing processes, making it suitable for various fields such as aerospace, automotive, construction, and bridges. Through flexible adjustment of the gap and hinge points, this invention can meet the vibration control requirements of different engineering applications, significantly improving the stability and safety of the system. Furthermore, compared to traditional single-beam hinged structures, this invention offers better vibration reduction performance. In the entire sandwich beam structure, the replacement of the core layer structure makes the installation and adjustment of these components convenient and easy. All materials used are common, inexpensive, and simple to process. This structural specimen not only provides a correct basis for verifying theories and simulation results but can also be widely applied in engineering and daily life, exhibiting excellent vibration reduction effects.

[0074] Figure 11 The figure shows a comparison of the vibration reduction performance of the gapped hinged sandwich beam structure proposed in this invention and the traditional gapped hinged single beam structure (the solid line represents the structure designed in this invention, and the dashed line represents the traditional single beam gapped hinged beam structure). The horizontal axis represents the external excitation frequency, and the vertical axis represents the displacement transmissibility. It can be clearly seen from the figure that the structure designed in this invention has good broadband vibration reduction performance under the same gap and has a better vibration reduction effect than the traditional single beam structure, which better reflects the superiority and innovation of the structure of this invention.

[0075] Compared with the traditional single-beam gap hinge structure, the present invention has better vibration reduction performance. In the whole sandwich beam structure, by replacing the core layer structure, these components are easy to install and adjust. All the materials used are common materials, with low cost and simple processing. This structural specimen can not only provide a correct basis for verifying the theory and simulation results, but can also be widely used in engineering and life, with excellent broadband vibration reduction effect.

Claims

1. A gapped hinged sandwich beam structure with wideband vibration reduction performance, characterized in that, It includes a first substructure (2) and a second substructure (3), which are combined by a hinge with a gap; the first substructure (2) and the second substructure (3) are formed by periodic arrangement of unit cells (1) in one-dimensional space; the unit cell (1) is a sandwich beam structure, each sandwich beam structure includes upper and lower high-strength beams (5) and a middle lightweight core layer (4); the core layer (4) is assembled with the upper and lower high-strength beams (5) using a slot design; The first substructure (2) and the second substructure (3) are connected sequentially by a rigid connector and a variable flexible connector. The rigid connector is a gap rotary hinge structure (6). The variable flexible connector is a transverse spring (7) and a torsion spring (8). The transverse spring (7) is arranged vertically along the first substructure (2) and the second substructure (3), and the torsion spring (8) is arranged transversely along the first substructure (2) and the second substructure (3). The transverse spring (7) and the torsion spring (8) are arranged vertically and vertically respectively. The gap rotary hinge structure (6) is the hinge point of a sandwich beam structure with a gap hinge.

2. The gapped hinged sandwich beam structure with wideband vibration reduction performance according to claim 1, characterized in that, The base materials of the first substructure (2), the second substructure (3), and the gap rotary hinge structure (6) are metal materials, and are prepared by casting and wire cutting machining methods.

3. The gapped hinged sandwich beam structure with wideband vibration reduction performance according to claim 1, characterized in that, The high-strength beam (5) is a cuboid beam with a slot with through holes. The size of the slot is fixed to facilitate universality. At the same time, the individual cells (1) are connected by slots to achieve the custom beam length.

4. A gapped hinged sandwich beam structure with wideband vibration reduction performance according to claim 1, characterized in that, The sandwich layer (4) is composed of a multi-slant bar platform with a circular cross-section radius of 0.5cm. The top of the multi-slant bar platform is a frustum structure, with multiple slant bars aggregating into a frustum. The bottom of the multi-slant bar platform is a distribution structure with a card slot, and each card slot cooperates with and is fixed to the slot of the high-strength beam (5).

5. A gapped hinged sandwich beam structure with wideband vibration reduction performance according to claim 1, characterized in that, The sandwich layer (4) and the high-strength beam (5) are fixed together by bolts. The sandwich layer (4) of the same type can be disassembled and replaced to meet different engineering requirements.

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