Dot matrix system with fluid regulating function, fluid regulating method and dot matrix structure

Abstract

The application discloses a dot matrix system with fluid regulation function, a fluid regulation method and a dot matrix structure, and belongs to the technical field of mechanical vibration control and metamaterial structure technology.The dot matrix system comprises a dot matrix structure body and a fluid regulation system.The dot matrix structure body comprises a bearing base body, locally resonant units arranged in an array and an internal fluid containing cavity, and is provided with a first fluid interface and a second fluid interface which are in communication with the fluid containing cavity.The fluid regulation system comprises a liquid supply module, a gas supply module and a control module, and is in communication with the fluid interfaces respectively.The control module is configured to dynamically control fluid medium injection or discharge to adjust dynamic performance.The application realizes online continuous adjustment of equivalent mass and stiffness of the dot matrix structure, and solves the problems of fixed structure performance and difficulty in adapting to variable working conditions.

Description

Technical Field

[0001] This invention belongs to the field of mechanical vibration control and metamaterial structure technology, specifically relating to a lattice system with fluid control function, a fluid control method, and a lattice structure. Background Technology

[0002] Currently, lattice structures are widely used in aerospace, rail transportation, and precision equipment due to their advantages such as lightweight, high specific stiffness, and high specific strength. To achieve low-frequency vibration reduction, existing technologies typically introduce local resonant units into the lattice structure.

[0003] However, existing liquid-filled or ballasted lattice structures mostly employ passive design or offline adjustment methods. For example, some existing technologies add mass by filling the scatterer with liquid, but this is a completely passive control scheme, requiring no external energy or control system. Once manufactured, the internal medium state, frequency, and bandgap range are fixed, making dynamic adjustment impossible based on real-time changing operating conditions. Moreover, although existing technologies have independent liquid-filled layers and injection ports, each cavity is independently sealed without independent venting ports, relying solely on gravity venting for offline filling, which is cumbersome and difficult to control online during equipment operation. This limitation of fixed dynamic performance or lagging adjustment makes existing local resonant lattice structures unsuitable for complex and variable vibration environments, restricting their application in broadband, adaptive vibration reduction scenarios. Therefore, there is a need to develop a novel lattice system with load-bearing capacity, low-frequency vibration reduction capabilities, and dynamic control. Summary of the Invention

[0004] This invention provides a lattice system and fluid control method with fluid control function, as well as a lattice structure, which can realize online continuous adjustment of the equivalent mass, local damping and dynamic stiffness of the lattice structure, and solves the problem that the dynamic performance of local resonant lattice structures cannot be dynamically adjusted online in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A lattice system with fluid control function includes a lattice structure body and a fluid control system; The lattice structure body includes a support base and multiple local resonant units arranged in an array on the support base. The local resonant units include inertial mass components and elastic connecting components. The lattice structure body has a fluid receiving cavity inside and a first fluid interface and a second fluid interface communicating with the fluid receiving cavity on the lattice structure body. The fluid control system includes a liquid supply module, a gas supply module, and a control module; the liquid supply module and the gas supply module are respectively connected to the first fluid interface and / or the second fluid interface; the control module is communicatively connected to the liquid supply module and the gas supply module, and is used to dynamically control the liquid supply module and the gas supply module to inject or discharge fluid medium into the fluid receiving cavity during the operation of the lattice structure body, so as to adjust the dynamic performance of the lattice structure body.

[0006] The above system tightly couples the lattice structure with an active control system that includes both gas and liquid paths. By using the control module to dynamically change the state of the medium in the fluid containment cavity (such as liquid filling volume, gas pressure, etc.) during operation, the equivalent mass and stiffness of the structure can be adjusted in real time. This breaks the limitations of traditional lattice structures with fixed performance or only offline adjustment, and realizes online adaptive matching of vibration reduction performance.

[0007] In one embodiment, the first fluid interface is an injection port, and the second fluid interface is an exhaust port; the injection port is located in the lower region of the lattice structure body, and the exhaust port is located in the higher region of the lattice structure body; the fluid receiving cavity connects the injection port and the exhaust port, so that when the liquid medium is injected into the fluid receiving cavity from bottom to top, it can drive the gas in the fluid receiving cavity to be discharged from the exhaust port; by utilizing the synergistic effect of gravity and fluid flow, the gas in the complex cavity is fully discharged, effectively avoiding uneven medium distribution and performance fluctuations caused by residual air bubbles, and improving the reliability of the filling process and the consistency of structural performance.

[0008] In one embodiment, a detachable sealing connection assembly is provided at the injection port and / or the vent port. The sealing connection assembly includes: a fluid conduit, a fastener, and a seal. The fluid conduit has a fluid channel inside, one end of which communicates with the fluid receiving cavity, and the other end has an external thread and a connecting end face. The fastener has an internal thread that mates with the external thread. The seal is disposed between the fastener and the connecting end face. When the fastener is tightened, the seal is deformed under pressure to form a seal between the fluid conduit and the external pipeline.

[0009] In one implementation, the control module is used to execute the following filling control process: opening the venting channel connected to the second fluid interface and starting the liquid supply module to inject liquid medium into the fluid receiving cavity; monitoring the fluid discharge status of the second fluid interface; and when the second fluid interface is detected to be continuously discharging liquid medium, closing the venting channel and stopping the liquid supply module.

[0010] In one implementation, the system further includes a vibration sensing unit, which is communicatively connected to the control module and is used to collect real-time vibration state data of the lattice structure body. Based on the real-time vibration state data, the control module dynamically adjusts the output pressure of the gas supply module or the injection amount of the liquid supply module to adaptively adjust the resonant frequency or damping characteristics of the lattice structure body. A vibration feedback mechanism is introduced, enabling the system to optimize its own dynamic parameters in real time according to changes in external excitation, thus achieving true adaptive vibration reduction.

[0011] In one embodiment, the elastic connector covers the outside of the inertial mass and connects the inertial mass to the support base; the fluid receiving cavity is disposed inside the support base and communicates with the area surrounding the plurality of local resonant units.

[0012] In one embodiment, the inertial mass component is a scatterer structure made of high-density material, the elastic connector is a coating layer made of flexible polymer material, and the bearing substrate is a frame structure made of resin material or composite material; the scatterer structure, the coating layer, and the bearing substrate are arranged coaxially to form a nested connection structure.

[0013] In one embodiment, the fluid medium injected into the fluid receiving cavity includes a liquid medium and / or a gaseous medium; the liquid medium includes at least one of water, glycerol solution, liquid paraffin, or silicone oil; the gaseous medium includes at least one of air, nitrogen, or an inert gas. The fluid medium can be flexibly configured according to specific operating conditions, for example, using a high-viscosity liquid to enhance damping, or using compressed gas to achieve fine-tuning of stiffness, thereby enhancing the adaptability and scalability of the system.

[0014] The present invention also provides a fluid control method for the above-mentioned lattice system with fluid control function, comprising the following steps: During the operation of the dot matrix structure body, the liquid supply module is activated by the control module to inject the liquid medium into the fluid receiving cavity through the first fluid interface, and at the same time, the gas medium in the fluid receiving cavity is discharged through the second fluid interface. After the gas medium in the fluid containment chamber is exhausted, the control module stops the liquid supply module and closes the second fluid interface. During the operation of the lattice structure body, the gas supply module is activated by the control module to inject the gas medium into the fluid receiving cavity and adjust the internal gas pressure to dynamically change the equivalent mass and dynamic stiffness of the lattice structure body.

[0015] The above-mentioned control method realizes online continuous control of the dynamic performance of the lattice structure by dynamically executing the injection, discharge and pressure regulation steps of the gas-liquid medium during system operation. This solves the problem that traditional methods can only be adjusted offline and statically, enabling the structure to adapt to the changing vibration environment in real time.

[0016] The present invention also provides a lattice structure, comprising: a supporting substrate; a plurality of local resonant units arranged in an array on the supporting substrate, wherein each local resonant unit includes an inertial mass component and an elastic connector; a fluid receiving cavity disposed inside the supporting substrate or around the local resonant units; a first fluid interface and a second fluid interface respectively disposed at different height positions on the supporting substrate and both communicating with the fluid receiving cavity; wherein both the first fluid interface and the second fluid interface are provided with a detachable sealing connection assembly, the sealing connection assembly being configured to seal and connect with the pipeline of an external fluid control system to receive externally injected fluid medium or discharge fluid medium during operation, thereby adjusting the dynamic performance of the local resonant lattice structure online.

[0017] Beneficial effects: This invention provides a lattice system and fluid control method with fluid control function, as well as a lattice structure, which has the following advantages compared with the prior art: 1. This invention integrates a local resonant lattice structure with a gas-liquid dual-path active control system. By using a control module to dynamically adjust the state of the medium in the fluid containment cavity during operation, and changing the equivalent mass, local damping, and dynamic stiffness of the structure based on the principle of fluid-structure interaction, the invention achieves online continuous adjustment of vibration reduction performance. This solves the problem that the dynamic performance of lattice structures in the prior art is fixed and cannot adapt to changing working conditions.

[0018] 2. By configuring the injection port and the exhaust port at different heights, the present invention utilizes the upward flow of liquid to drive out the gas in the cavity, ensuring the full discharge of gas in the complex cavity, avoiding uneven medium distribution caused by residual air bubbles, and improving the reliability of the filling process and the repeatability of structural performance control.

[0019] 3. This invention achieves adaptive optimization of structural resonance frequency or damping characteristics by dynamically adjusting gas-liquid supply parameters based on real-time vibration state data through closed-loop feedback between the vibration sensing unit and the control module. This overcomes the shortcomings of traditional passive or open-loop control schemes, such as adjustment lag and insufficient accuracy, and significantly improves the vibration suppression effect of the system in complex vibration environments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the dot matrix structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the injection port / vent port structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the local resonance unit structure in an embodiment of the present invention; Figure 4 This is a schematic diagram of the internally connected fluid-containing cavity structure in an embodiment of the present invention; Figure 5 This is a top view of the lattice structure in an embodiment of the present invention; Figure 6 This is a schematic diagram of the overall structure of the air / liquid filling control device in an embodiment of the present invention; Figure 7 This is a schematic diagram of the pipeline control principle in an embodiment of the present invention; Figure 8 This is a flowchart of the fluid control method in an embodiment of the present invention; Figure 9 This is a characteristic curve of the simulated transfer ratio as a function of excitation frequency in an embodiment of the present invention; In the diagram, 1-exhaust port, 2-column-type air / liquid lattice structure, 3-water inlet, 4-nut, 5-sealing ring, 6-air / liquid filling pipe, 7-scatterer structure, 8-coating layer, 9-substrate, 10-air / liquid filling chamber, 11-support plate, 12-liquid storage tank, 13-liquid injection pump, 14-liquid solenoid valve, 15-gas cylinder, 16-pressure reducing valve, 17-gas solenoid valve, 18-controller, 19-exhaust pipe, 20-liquid injection pipe. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: Example 1:

[0022] like Figure 6 and Figure 7 As shown, this embodiment provides a local resonant lattice system with fluid control function, which mainly includes two parts: the lattice structure body and the fluid control system. By integrating the load-bearing structure with the active control device, the online dynamic adjustment of vibration reduction performance is realized.

[0023] The lattice structure body includes a supporting substrate and multiple local resonant units arranged in an array on the supporting substrate. Figure 1In the example shown, the lattice structure body is a cylindrical inflatable / liquid-filled lattice structure 2, whose main body consists of a base 9 and a support plate 11 forming a frame, with multiple local resonant units arranged periodically along the axial and circumferential directions. It should be understood that although a cylindrical configuration is shown in the figure, in other embodiments, the lattice structure body can also adopt a flat plate, curved surface, or other three-dimensional topological configuration, as long as it has periodically arranged resonant units. The local resonant units include inertial mass components and elastic connectors, used to generate local resonance at a specific frequency to suppress vibration propagation. The lattice structure body has a fluid-containing cavity inside, such as an inflatable / liquid-filled cavity 10 formed by hollowing out the base 9. This cavity communicates with the area surrounding the multiple local resonant units, allowing the injected fluid medium to directly participate in the structure's dynamic response. The lattice structure body also has a first fluid interface and a second fluid interface communicating with the fluid-containing cavity, such as... Figure 1 The water inlet 3 and the vent 1 serve as channels for fluid to enter and exit.

[0024] The fluid control system includes a liquid supply module, a gas supply module, and a control module. The liquid supply module and the gas supply module are respectively connected to a first fluid interface and / or a second fluid interface, forming independent or shared fluid delivery paths. Figure 6 The overall diagram shows that the liquid supply module specifically includes a storage tank 12, a liquid injection pump 13, and a liquid solenoid valve 14. The liquid medium in the storage tank 12 is driven by the liquid injection pump 13 and transported to the water inlet 3 at the bottom of the lattice structure body through the liquid solenoid valve 14 and the liquid injection pipe 20. The gas supply module specifically includes a gas cylinder 15, a pressure reducing valve 16, and a gas solenoid valve 17. The high-pressure gas in the gas cylinder 15 is regulated by the pressure reducing valve 16 and then transported to the lattice structure body through the gas solenoid valve 17. It should be noted that the above pump and valve assembly is only one specific implementation. In other embodiments, the liquid supply module can also adopt gravity supply, pneumatic compression, etc., and the gas supply module can also use a micro air pump or compressor instead of a high-pressure gas cylinder, as long as the controllable delivery of fluid can be achieved.

[0025] The control module is communicatively connected to both the liquid supply module and the gas supply module. During the operation of the lattice structure, it dynamically controls the liquid and gas supply modules to inject or discharge fluid media into the fluid-containing cavity to adjust the dynamic performance of the lattice structure. Figure 6As shown, the controller 18, as the core of the control module, is connected to actuators such as the injection pump 13, liquid solenoid valve 14, and gas solenoid valve 17 via signal lines. The emphasis here on "during operation" refers to the lattice structure being in service or under external load, not in a shutdown / maintenance state; "dynamic control" refers to adjusting the type, filling volume, or pressure of the fluid medium in real time according to operating conditions, rather than fixing it after a one-time filling. For example, when the external excitation frequency changes, the controller 18 can instruct the gas supply module to inject high-pressure gas into the filling / liquid chamber 10, utilizing the compressibility of the gas to change the equivalent stiffness of the structure; or instruct the liquid supply module to inject high-density liquid, increasing the equivalent mass and damping of the structure. This proactive, online control mechanism fundamentally overcomes the shortcomings of traditional lattice structures, which have fixed dynamic performance and cannot adapt to changing operating conditions, providing a hardware foundation and system architecture support for the adaptive closed-loop control in subsequent embodiments.

[0026] Example 2:

[0027] This embodiment provides a detailed description of the system design in Embodiment 1.

[0028] The first fluid interface is a liquid injection port, and the second fluid interface is a venting port. The liquid injection port is located in the lower region of the lattice structure body, and the venting port is located in the upper region of the lattice structure body. The fluid receiving cavity is connected to the liquid injection port and the venting port, so that when the liquid medium is injected into the fluid receiving cavity from bottom to top, it can drive the gas in the fluid receiving cavity to be discharged from the venting port.

[0029] Combination Figure 1 As shown, the water inlet 3 is located at the center below the bottom support plate 11 of the columnar air / liquid lattice structure 2, while the exhaust port 1 is located at the center above the top support plate 11, creating a significant height difference between the two in the axial direction. This spatial configuration utilizes the gravity separation and buoyancy-driven mechanism in fluid dynamics: when the liquid medium enters the air / liquid cavity 10 from the lower water inlet 3, due to the significantly higher density of the liquid than the original gas in the cavity, the liquid naturally settles and accumulates at the bottom of the cavity under the action of gravity. As the liquid level gradually rises, the gas in the cavity is forced upwards by the combined effects of liquid compression and its own buoyancy, and finally discharged from the higher exhaust port 1. Compared with traditional side-filling or top-filling methods, this bottom-up unidirectional flow path can effectively avoid gas stagnation or gas resistance in the dead corners of complex cavities, ensuring the integrity and uniformity of the medium filling in the air / liquid cavity 10, thereby ensuring the consistency and repeatability of the dynamic performance control of the lattice structure.

[0030] A detachable sealing connection assembly is provided at the injection port and / or vent port. The sealing connection assembly includes: a fluid conduit with an internal fluid channel, one end of which communicates with a fluid receiving cavity, and the other end having an external thread and a connecting end face; a fastener with an internal thread that mates with the external thread; and a seal disposed between the fastener and the connecting end face. When the fastener is tightened, the seal is deformed under pressure to form a seal between the fluid conduit and the external pipeline. Figure 2 As shown, the sealing connection assembly specifically includes an inflation / liquid filling tube 6, a nut 4, and a sealing ring 5. The inflation / liquid filling tube 6 serves as a fluid conduit, with its lower end passing through the support plate 11 and communicating with the inflation / liquid filling chamber 10. Its upper end is machined with a standard external thread and a flat connecting end face. The nut 4 serves as a fastener, with a matching internal thread inside, and is fitted onto the outside of the inflation / liquid filling tube 6. The sealing ring 5 serves as a sealing element, preferably made of an oil-resistant and pressure-resistant elastic material, and is placed in an annular groove between the lower end face of the nut 4 and the connecting end face of the inflation / liquid filling tube 6. When the external pipeline is connected, tightening the nut 4 causes it to move axially downwards, applying a continuous compressive load to the sealing ring 5. This forces the sealing ring 5 to undergo elastic-plastic deformation, tightly fitting against the outer wall of the fluid conduit, the connecting end face, and the external pipeline joint, thereby establishing a reliable static sealing interface. The advantage of this sealing structure lies in its modularity and versatility. The water inlet 3 and the vent 1 can use sealing connection components of the exact same specifications, which not only simplifies mold design and spare parts management but also allows for quick disassembly and replacement during on-site maintenance. Furthermore, although the figure shows a threaded fastening method, in other embodiments, fasteners can also be quick-connect clips, flange bolt assemblies, or interference fit sleeves. The sealing element can also be selected from materials such as fluororubber, silicone rubber, or polytetrafluoroethylene, depending on the characteristics of the medium, as long as it can achieve the function of "forming a seal through pressure deformation," it will meet the technical requirements of this application.

[0031] Example 3:

[0032] This embodiment provides a detailed description of the system design in Embodiment 1.

[0033] The control module executes the following filling control logic: opens the venting channel connected to the second fluid interface and starts the liquid supply module to inject liquid medium into the fluid receiving cavity; monitors the fluid discharge status of the second fluid interface; and in response to detecting continuous discharge of liquid medium from the second fluid interface, closes the venting channel and stops the liquid supply module. Combined with... Figure 7The control principle shown constitutes the basic process for the system to achieve automated and high-precision media filling. When the controller 18 receives the filling command, it first controls the valve on the exhaust channel (such as the gas solenoid valve 17 or an independent exhaust valve) to be in the open state, and at the same time starts the injection pump 13 and opens the liquid solenoid valve 14, so that the liquid medium enters the air / liquid filling chamber 10 from the storage tank 12 through the injection pipe 20. During this process, the controller 18 monitors the properties of the discharged medium in real time through a fluid state sensor set at the exhaust port 1 or on the exhaust pipe 19. The "continuous discharge of liquid medium" emphasized here is a key physical criterion, which means that within a preset time window, the fluid signal detected by the sensor continuously represents liquid characteristics (such as abrupt changes in conductivity, stable optical refractive index, or continuous flow count value), rather than intermittent droplets or gas-liquid mixed foam. The physical essence of this criterion is to confirm that the gas-liquid interface has stably crossed the exhaust port position, indicating that the gas in the chamber has been completely driven out and the liquid has formed a continuous flow path. Compared to traditional timed control or quantitative injection methods, this feedback control based on phase recognition can effectively eliminate filling errors caused by changes in pipeline resistance, fluctuations in pump flow rate, or tolerances in cavity volume, ensuring a highly consistent medium filling rate in the fluid receiving cavity after each filling, thereby guaranteeing the repeatability and accuracy of the dynamic performance control of the lattice structure.

[0034] The lattice system also includes a vibration sensing unit, which is communicatively connected to the control module and configured to collect real-time vibration state data of the lattice structure. The control module is further configured to dynamically adjust the output pressure of the gas supply module or the injection volume of the liquid supply module based on the real-time vibration state data, thereby adaptively adjusting the resonant frequency or damping characteristics of the lattice structure. This feature, based on the open-loop control described in Example 1, further constructs a closed-loop adaptive control system of "sensing-decision-execution". Specifically, the vibration sensing unit can be a piezoelectric accelerometer, strain gauge, or non-contact laser Doppler vibrometer mounted on the surface of the supporting substrate 9, used to acquire real-time state parameters such as vibration frequency, amplitude, or transfer function of the lattice structure under service conditions. If an increase in the external dominant frequency is detected, the controller 18 can instruct the gas supply module to increase the injection pressure into the gas / liquid filling chamber 10. This utilizes the compressibility of the gas medium to improve the equivalent dynamic stiffness of the local resonant unit, thereby shifting the bandgap center frequency towards higher frequencies to re-cover the target frequency band. Conversely, if it is necessary to enhance the low-frequency vibration suppression effect or improve energy dissipation, the controller 18 can instruct the liquid supply module to inject a high-viscosity liquid (such as silicone oil), optimizing vibration reduction performance by increasing added mass and viscous damping. This dynamic adjustment mechanism based on real-time vibration feedback transforms the lattice structure from a static vibration damping component into an intelligent system with environmental adaptability. It can maintain optimal vibration reduction under complex and changing working conditions, significantly improving the system's engineering practicality and anti-interference capabilities. It should be understood that although the above examples describe the single-action modes of gas and liquid regulation, in practical applications, the control module can also collaboratively adjust the ratio and pressure of the gas and liquid phases to achieve decoupled control of stiffness and damping or multi-objective joint optimization.

[0035] Example 4:

[0036] This embodiment provides a detailed description of the system design in Embodiment 1.

[0037] An elastic connector covers the outside of the inertial mass component and connects it to the supporting substrate; a fluid-containing cavity is located inside the supporting substrate and communicates with the areas surrounding multiple localized resonant units. Figure 3As shown, this spatial layout forms the basis of the local resonance effect. In the figure, the scatterer structure 7, acting as an inertial mass, is located at the center. The covering layer 8, acting as an elastic connector, tightly wraps around the outer peripheral surface and upper and lower end faces of the scatterer structure 7, suspending and supporting the scatterer structure 7 within the inner hole of the base 9, which serves as the load-bearing substrate. When external vibration excitation is transmitted to the base 9, due to the large inertia of the scatterer structure 7, its motion response lags behind the base 9. The covering layer 8 provides restoring force and damping, causing the scatterer structure 7 to undergo strong local resonance at a specific frequency. The anti-phase inertial force generated by this resonance can effectively counteract the vibration energy of the base 9, thereby forming a vibration-damping bandgap on a macroscopic scale. More importantly, the air / liquid filling cavity 10 is not isolated but is directly opened inside the base 9 and connected to the annular region surrounding the local resonance unit. This means that the injected fluid medium not only occupies the cavity volume but also directly wraps around the periphery of the resonance unit, becoming part of the vibration system. When the fluid medium enters this region, its own inertia and viscosity will directly participate in the dynamic process of local resonance, changing the equivalent parameters of the system through the fluid-structure interaction effect. This is the microstructure prerequisite for realizing active control function.

[0038] The inertial mass component is a scatterer structure made of high-density material, the elastic connector is a coating layer made of flexible polymer material, and the load-bearing substrate is a frame structure made of resin or composite material; the scatterer structure, coating layer, and load-bearing substrate are arranged coaxially to form a nested connection structure. Figure 3 As shown, this coaxial nested structure ensures the symmetry and stability of the vibration response. In terms of specific material selection, the scatterer structure 7 is preferably made of high-density metal materials such as lead, tungsten, or steel to provide a sufficiently large inertial mass within a limited volume, reducing the resonant frequency. The covering layer 8 is preferably made of flexible polymer materials such as rubber, silicone, or polyurethane. These materials possess both elastic energy storage and viscous energy dissipation characteristics, providing both stable stiffness support and necessary structural damping. The matrix 9 can be prepared using photosensitive resin, nylon, or carbon fiber composite materials through additive manufacturing or compression molding processes to meet the dual requirements of lightweight and high strength. It should be understood that although this embodiment demonstrates a cylindrical coaxial nested configuration, spherical, cubic, or other polygonal configurations can also be used in other embodiments, as long as the series mechanical transmission path of "mass-elasticity-frame" is maintained. This combination of material and structure design ensures that the lattice structure possesses excellent low-frequency vibration reduction performance and adjustable potential while bearing external loads.

[0039] The fluid medium injected into the fluid-containing cavity includes liquid and / or gaseous media; the liquid medium includes at least one of water, glycerol solution, liquid paraffin, or silicone oil; the gaseous medium includes at least one of air, nitrogen, or inert gas. This invention provides a variety of fluid media, enabling the system to be customized for different operating conditions. Specifically, the physical properties of different media correspond to different control mechanisms: when selecting liquid media such as water, glycerol solution, liquid paraffin, or silicone oil, the incompressibility and high density of the liquid are mainly utilized to increase the added mass of the system, thereby significantly reducing the local resonant frequency and widening the low-frequency bandgap range; simultaneously, the viscosity differences of different liquids also provide the freedom for damping adjustment. For example, high-viscosity silicone oil or glycerol solution can dissipate more vibration energy through internal shear friction when resonance occurs, enhancing the vibration reduction effect. When selecting gaseous media such as air, nitrogen, or inert gas, the compressibility of the gas is mainly utilized. By adjusting the filling pressure, the equivalent bulk modulus within the fluid cavity is changed, thereby achieving continuous fine-tuning of the structural dynamic stiffness, allowing the bandgap center frequency to accurately track the changing external excitation frequency. Furthermore, in practical applications, liquids and gases can be mixed and injected as needed to form a gas-liquid two-phase flow medium. This allows for the introduction of additional nonlinear dynamic characteristics by utilizing the surface tension at the gas-liquid interface and the pulsation effect of bubbles, further enriching the system's control dimensions. This diversity in medium selection enables the same hardware architecture to adapt to various application scenarios, from vibration isolation for precision instruments to noise reduction for heavy equipment.

[0040] Example 5:

[0041] This embodiment provides a fluid control method for a localized resonant lattice system with fluid control functionality, using the lattice system described in Embodiments 1-4. It should be specifically noted that the method described in this embodiment is an online control method executed during the service of the lattice structure or during operation under external loads, rather than a static debugging method during the manufacturing process or in a shutdown state. The fluid control method includes the following steps: S1: During the operation of the lattice structure, the control module activates the liquid supply module, injecting liquid medium into the fluid receiving cavity via the first fluid interface, while simultaneously discharging gaseous medium from the fluid receiving cavity via the second fluid interface. In this step, the injection of liquid medium and the discharge of gaseous medium are synchronized or coordinated. The control module activates the power source of the liquid supply module (such as a pumping unit or gravity release valve) according to a preset program or real-time command, allowing the liquid medium to continuously flow into the fluid receiving cavity. At the same time, the second fluid interface remains open, utilizing the upward flow trend of liquid and the buoyancy of gas itself to directionally drive the original gaseous medium in the cavity to a higher position and discharge it through the second fluid interface. This synchronous injection and discharge mechanism effectively avoids gas resistance and ensures the continuity of liquid medium filling in complex cavities.

[0042] S2: In response to the complete purging of the gaseous medium in the fluid containment chamber, the control module stops the liquid supply module and closes the second fluid interface. Here, "complete purging of the gaseous medium" does not refer to an absolute vacuum state, but rather to a state where a continuous liquid flow path has been formed within the fluid containment chamber, and there are no longer any bubble clusters affecting kinetic performance. As a preferred implementation, the control module can determine whether this state has been reached by monitoring the phase state of the discharged material from the second fluid interface. For example, when continuous discharge of liquid medium is detected from the second fluid interface, it is determined that the gas has been purged. At this time, the control module immediately cuts off the power output of the liquid supply module and closes the valve or sealing assembly at the second fluid interface, causing the fluid containment chamber to enter a pressure-holding or closed state. Compared to open-loop control based on fixed time, this phase-state feedback-based triggering mechanism can automatically adapt to changes in pipeline resistance, pump flow fluctuations, and chamber volume tolerances, significantly improving filling accuracy and repeatability.

[0043] S3: During the operation of the lattice structure, the control module activates the gas supply module to inject gas into the fluid containment cavity and adjust the internal gas pressure to dynamically change the equivalent mass and dynamic stiffness of the lattice structure. This step can be performed after S2, or independently or alternately with liquid injection depending on the operating conditions. When the external excitation frequency drifts, the control module drives the gas supply module to replenish or release gas into the fluid containment cavity, utilizing the compressibility of the gas to change the equivalent bulk modulus within the cavity. Due to the mechanical coupling between the elastic connector of the local resonant unit and the fluid containment cavity, changes in the internal gas pressure are directly superimposed on the equivalent stiffness of the elastic connector, thereby shifting the bandgap center frequency of the system. For example, increasing the gas pressure increases the dynamic stiffness, shifting the damping frequency band to higher frequencies; decreasing the gas pressure has the opposite effect. This stiffness modulation method based on gas pressure regulation endows the system with the ability to perform fine frequency tracking over a wide frequency range.

[0044] The method may also include S4, which is to collect the vibration state data of the lattice structure in real time through the vibration sensing unit during the operation of the lattice structure body and transmit the data to the control module; the control module obtains the current external excitation characteristics based on the vibration state data and dynamically adjusts the output pressure of the gas supply module or the injection volume of the liquid supply module accordingly.

[0045] To further verify the actual vibration reduction performance of the lattice system with fluid control function described in this invention, a finite element frequency response simulation was performed on the lattice structure model with the fluid receiving cavity completely filled with liquid medium (water). The characteristic curve of the transfer ratio as a function of excitation frequency obtained from the simulation is shown below. Figure 9As shown, this is a simulation curve of the transfer ratio-frequency when the lattice structure is filled with liquid medium during operation; the gray shaded area in the figure represents the bandgap region generated by local resonance; from Figure 9 It is known that the lattice structure exhibits several resonant peaks in the low-frequency region (below 614.8 Hz), with a transfer ratio greater than 0 dB. However, in the mid-to-low frequency range of approximately 614.8 Hz to 1747.7 Hz, the lattice structure displays a significant low transfer ratio, rapidly decaying to below -20 dB (reaching as low as approximately -40 dB). This region represents the bandgap generated by the coupling between the local resonant unit and the fluid medium. This indicates that after the fluid-containing cavity is filled with liquid medium, by changing the equivalent mass of the local resonant unit, the local resonant bandgap is effectively adjusted to a low frequency, forming a relatively wide stopband. Within this frequency band, external vibrations cannot propagate through the lattice structure, achieving excellent vibration isolation and suppression effects, thus verifying the effectiveness and feasibility of the online dynamic fluid control mechanism of this invention.

[0046] Example 6:

[0047] like Figure 1 As shown, this embodiment provides a localized resonant lattice structure, which is part of the lattice system of embodiments 1-4, including a supporting substrate and multiple localized resonant units. Figure 1 In the example shown, the supporting substrate is a frame structure consisting of substrate 9 and support plate 11. Multiple local resonant units are arranged in an array on the supporting substrate. Each local resonant unit includes an inertial mass component and an elastic connector, such as a mass-elastic nested system consisting of scatterer structure 7 and cladding layer 8. This periodically arranged microstructure endows the structure with the physical potential to generate a local resonant bandgap, serving as the material carrier for subsequent adjustment of dynamic performance.

[0048] The local resonant lattice structure also includes a fluid-containing cavity, which is disposed inside the supporting substrate or around the local resonant units. The fluid-containing cavity can be an air-filled / liquid-filled cavity 10 formed by hollowing out the substrate 9. This cavity not only occupies a certain amount of internal space, but more importantly, it remains connected to the area surrounding multiple local resonant units, so that the fluid medium injected in the future can directly envelop or be adjacent to the resonant units, thereby participating in the vibration response through the fluid-structure interaction effect.

[0049] The localized resonant lattice structure also includes a first fluid interface and a second fluid interface, respectively located at different heights of the supporting substrate, and both communicating with the fluid receiving cavity. For example... Figure 1 As shown, the first fluid interface is located at the water inlet 3 below the bottom support plate, and the second fluid interface is located at the vent 1 above the top support plate.

[0050] Both the first and second fluid interfaces are equipped with detachable sealing connection components. These components are sealed to the piping of an external fluid control system to receive or discharge externally injected fluid media during operation, thereby adjusting the dynamic performance of the localized resonant lattice structure online. Figure 2 As shown, the detachable sealing connection assembly includes an inflation / liquid filling tube 6, a nut 4, and a sealing ring 5. The inflation / liquid filling tube 6 is embedded or inserted into the support plate as a fluid conduit, and its outer end is provided with a standard threaded interface; the nut 4 and the sealing ring 5 cooperate to form an axial compression sealing structure.

[0051] Through the above structural design, the localized resonant lattice structure provided in this embodiment integrates the fluid containment chamber, high and low position interface layout, and standardized sealing components into one unit, solving the problem that traditional lattice structures cannot adapt to online dynamic control requirements. Even without connection to an external control system, this product already possesses all the conditions to accept active fluid intervention.

[0052] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes, substitutions, improvements, or combinations made by those skilled in the art based on the technical concept disclosed in the present invention should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A lattice system with fluid control function, characterized in that, Includes the lattice structure body and the fluid control system; The lattice structure body includes a support base and multiple local resonant units arranged in an array on the support base. The local resonant units include inertial mass components and elastic connecting components. The lattice structure body has a fluid receiving cavity inside and a first fluid interface and a second fluid interface communicating with the fluid receiving cavity on the lattice structure body. The fluid control system includes a liquid supply module, a gas supply module, and a control module; the liquid supply module and the gas supply module are respectively connected to the first fluid interface and / or the second fluid interface; the control module is communicatively connected to the liquid supply module and the gas supply module, and is used to dynamically control the liquid supply module and the gas supply module to inject or discharge fluid medium into the fluid receiving cavity during the operation of the lattice structure body, so as to adjust the dynamic performance of the lattice structure body.

2. The lattice system with fluid control function according to claim 1, characterized in that, The first fluid interface is a liquid injection port, and the second fluid interface is a vent port; the liquid injection port is located in the lower region of the dot matrix structure body, and the vent port is located in the upper region of the dot matrix structure body; the fluid receiving cavity connects the liquid injection port and the vent port, so that when the liquid medium is injected into the fluid receiving cavity from bottom to top, the gas in the fluid receiving cavity can be driven out from the vent port.

3. The lattice system with fluid control function according to claim 2, characterized in that, The injection port and / or the vent port are provided with a detachable sealing connection assembly.

4. The lattice system with fluid control function according to claim 3, characterized in that, The sealing connection assembly includes: a fluid conduit, a fastener, and a seal. The fluid conduit has a fluid channel inside, one end of which communicates with the fluid receiving cavity, and the other end has an external thread and a connecting end face. The fastener has an internal thread that mates with the external thread. The seal is disposed between the fastener and the connecting end face. When the fastener is tightened, the seal is deformed under pressure to form a seal between the fluid conduit and the external pipeline.

5. The lattice system with fluid control function according to claim 1, characterized in that, The dot matrix system also includes a vibration sensing unit, which is communicatively connected to the control module and is used to collect real-time vibration state data of the dot matrix structure body. Based on the real-time vibration state data, the control module dynamically adjusts the output pressure of the gas supply module or the injection amount of the liquid supply module to adaptively adjust the resonance frequency or damping characteristics of the dot matrix structure body.

6. The lattice system with fluid control function according to claim 1, characterized in that, The elastic connector covers the outside of the inertial mass and connects the inertial mass to the support base; the fluid receiving cavity is disposed inside the support base and communicates with the area surrounding the plurality of local resonant units.

7. The lattice system with fluid control function according to claim 6, characterized in that, The inertial mass component is a scatterer structure made of high-density material, the elastic connector is a coating layer made of flexible polymer material, and the bearing substrate is a frame structure made of resin material or composite material; the scatterer structure, the coating layer and the bearing substrate are arranged coaxially to form a nested connection structure.

8. The lattice system with fluid control function according to claim 1, characterized in that, The fluid medium injected into the fluid receiving cavity includes a liquid medium and / or a gaseous medium; the liquid medium includes at least one of water, glycerol solution, liquid paraffin or silicone oil; the gaseous medium includes at least one of air, nitrogen or an inert gas.

9. A fluid control method, characterized in that, The method utilizes the lattice system with fluid control function as described in any one of claims 1-8 for fluid control, and includes the following steps: During the operation of the dot matrix structure body, the liquid supply module is activated by the control module to inject the liquid medium into the fluid receiving cavity through the first fluid interface, and at the same time, the gas medium in the fluid receiving cavity is discharged through the second fluid interface. After the gas medium in the fluid containment chamber is exhausted, the control module stops the liquid supply module and closes the second fluid interface. During the operation of the lattice structure body, the gas supply module is activated by the control module to inject the gas medium into the fluid receiving cavity and adjust the internal gas pressure to dynamically change the equivalent mass and dynamic stiffness of the lattice structure body.

10. A lattice structure, characterized in that, include: Supporting substrate; Multiple local resonant units are arranged in an array on the supporting substrate, and each local resonant unit includes an inertial mass component and an elastic connector. A fluid-containing cavity is disposed inside the supporting substrate or around the local resonant unit; a first fluid interface and a second fluid interface are respectively disposed at different height positions of the supporting substrate and are both connected to the fluid-containing cavity; wherein, both the first fluid interface and the second fluid interface are provided with a detachable sealing connection assembly, the sealing connection assembly being configured to seal and connect with the pipeline of an external fluid control system, so as to receive externally injected fluid medium or discharge fluid medium during operation, thereby adjusting the dynamic performance of the local resonant lattice structure online.

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