Cascaded bistable buckling component and inerter coupled torsional isolation device and method

Abstract

The application discloses a cascaded bistable warping component and inertial mass coupling torsional vibration isolation device and method, which comprises at least two bistable bending-torsion coupling units and an inertial mass unit arranged in series along the torque transmission direction; each bistable bending-torsion coupling unit comprises a center connector, an outer ring additional mass and a plurality of bistable warping nonlinear spring assemblies connected between the center connector and the outer ring additional mass; the bistable warping nonlinear spring assemblies have a preset spatial warping configuration; external load is sequentially transmitted to the inertial mass unit through the at least two bistable bending-torsion coupling units to realize torsional vibration isolation through multi-stable state transition and inertial mass effect. The cascaded bistable warping component and inertial mass coupling torsional vibration isolation device can improve the control effect on wide-frequency, variable-amplitude and impact torsional vibration while realizing lightweight and compact arrangement, and is suitable for coping with complex vibration environment.

Description

Technical Field

[0001] This invention relates to the field of vibration control and torsional isolation technology, and in particular to a cascaded bistable warping component and inertial-capacitive coupled torsional isolation device and method. Background Technology

[0002] Torsional vibration is widespread in rotating machinery, power transmission systems, coupling devices, wind turbines, vehicle drive shafts, precision electromechanical equipment, and other engineering structures subjected to periodic torsional loads. When a system is subjected to start-stop shocks, pulsating torques, periodic excitations, or complex time-varying loads, undesirable torsional vibrations and angular displacement fluctuations are easily generated. Such torsional responses not only reduce transmission accuracy and operational stability but can also cause localized stress concentrations, component fatigue damage, loose connections, abnormal gear meshing, and increased noise, and in severe cases, even lead to the failure of critical components. Therefore, how to effectively suppress torsional vibration under limited space and limited added mass conditions has always been an important research problem in the fields of vibration control and power transmission.

[0003] Existing torsional vibration reduction or isolation devices mostly employ linear springs, rubber elastomers, viscous dampers, or friction elements to form linear or near-linear torsional control systems. These devices typically exhibit good vibration reduction performance near the design operating conditions, and their structural forms are relatively mature.

[0004] However, linear torsional vibration isolation devices typically rely on specific parameter matching, and their performance is highly sensitive to the system's natural frequency, external excitation frequency, and damping parameters. When actual operating conditions include speed fluctuations, sudden load changes, structural parameter deviations, service degradation, or wideband excitation, traditional linear devices are prone to problems such as tuning failure, narrow isolation bandwidth, and significant decrease in control effectiveness, making it difficult to meet the high-efficiency vibration isolation requirements under complex operating conditions.

[0005] To enhance vibration control capabilities under complex dynamic environments, nonlinear vibration control technology has gained increasing attention. By introducing nonlinear stiffness, bistable, or multistable potential energy structures, systems can exhibit characteristics such as sudden jumps, steady-state transitions, broadband responses, and enhanced energy dissipation over a wide parameter range, thus providing new approaches to vibration control under complex loads. In particular, bistable or multistable elastic components can release strain energy and redistribute internal deformation through equilibrium state transitions under load, which is beneficial for enhancing the system's nonlinear vibration isolation and energy dissipation capabilities. However, existing multistable torsional control devices still generally suffer from problems such as complex configurations, difficult manufacturing and assembly, difficulty in controlling the steady-state threshold, limited single-stage response range, and difficulty in simultaneously considering added mass effects and inertial control capabilities. When the amplitude of the external torsional load varies significantly, the control performance of a single bistable component may still be limited.

[0006] On the other hand, inertial-capacitive elements have attracted widespread attention in recent years due to their ability to generate a large equivalent inertial effect under relatively small actual mass conditions, and have shown good application potential in the field of translational vibration control. Introducing the inertial-capacitive mechanism into a torsional system can amplify the inertial reaction force related to angular acceleration through gear transmission, lead screw transmission, or other motion conversion mechanisms, thereby improving the dynamic response characteristics of the system. However, most existing torsional inertial-capacitive devices are used as independent inertial elements, typically focusing on increasing the equivalent inertia or improving resonance characteristics, with insufficient consideration for nonlinear steady-state transitions, wide-range energy dissipation, and multi-level responses under complex torsional loads. Furthermore, existing inertial-capacitive torsional vibration reduction structures are still rarely combined with multistable elastic components, and there is a lack of a compact torsional isolation device that can organically couple multistable nonlinear recovery, interfacial friction energy dissipation, and the inertial-capacitive amplification mechanism.

[0007] Therefore, existing technologies still require a seismic isolation device with a reasonable structure, clear mechanism, and suitability for complex torsional load environments. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention proposes a cascaded bistable warping component and inertial-capacitive coupled torsional vibration isolation device. This addresses the issues of existing torsional vibration reduction or isolation devices under complex operating conditions, such as narrow tuning bandwidth, sensitivity to parameter deviations, insufficient adaptability to wide-amplitude torsional loads, limited nonlinear energy dissipation capacity, and difficulty in balancing inertial amplification with compact structural arrangement. This device should utilize the bistable warping component to form nonlinear bending-torsional coupling recovery characteristics, construct a multi-stable response structure through multi-stage cascading, and combine the inertial amplification effect of the inertial container with the frictional energy dissipation capacity of the connection interface. This achieves lightweight and compact arrangement while improving the control effect on broadband, variable-amplitude, and impact bending-torsional coupled vibrations, thereby enhancing the system's torsional isolation performance, energy dissipation capacity, and operational stability.

[0009] To achieve the above-mentioned technical objectives, the present invention is implemented through the following technical solution:

[0010] A cascaded bistable warping component and inertial-capacitive coupled torsional isolation device includes at least two bistable bending-torsional coupling units and one inertial-capacitive unit arranged in series along the torque transmission direction.

[0011] Each of the bistable bending-torsional coupling units includes: a central connector, an outer ring additional mass, and a plurality of bistable warping nonlinear spring assemblies connected between the central connector and the outer ring additional mass.

[0012] The bistable warping nonlinear spring assembly has a preset spatial warping configuration, which can generate bending and torsional coupled deformation under torsional load and exhibit bistable nonlinear recovery characteristics.

[0013] External torsional loads are sequentially transmitted to the inertial-capacitive unit via at least two bistable bending-torsional coupling units, so as to achieve torsional isolation through multi-stable steady-state transitions and inertial-capacitive effects.

[0014] Furthermore, the at least two bistable bending-torsional coupling units include a first bistable bending-torsional coupling unit, a second bistable bending-torsional coupling unit, and a third bistable bending-torsional coupling unit, which are connected in series along the torque transmission direction. The bistable warping nonlinear spring components in the first, second, and third bistable bending-torsional coupling units are configured to have progressively increasing critical transition thresholds.

[0015] Furthermore, the bistable warping nonlinear spring assembly includes:

[0016] A fixed end connection portion, a free end connection portion, and a first warping elastic beam and a second warping elastic beam connected between the fixed end connection portion and the free end connection portion;

[0017] The fixed end connection part is provided with at least two fixed end mounting holes for fixed connection with the central connector or the outer ring additional mass component;

[0018] The free end connecting part is provided with at least two free end connecting holes for assembly and connection with the corresponding connecting parts;

[0019] The first and second warped elastic beams form a spatially separated warped shape after assembly, and are spaced apart in a direction perpendicular to the plane of the elastic beams.

[0020] Furthermore, the central connector includes a central connecting flange, a central connecting plate, and a plurality of spring assembly connecting lugs arranged circumferentially along the central connecting plate; the spring assembly connecting lugs are used to connect to one end of the bistable warping nonlinear spring assembly.

[0021] Furthermore, the outer ring additional mass component is a ring-shaped rigid component with multiple outer end mounting connection blocks arranged circumferentially. The outer end mounting connection blocks are used to connect and fix one end of the bistable warping nonlinear spring assembly. During operation, the outer ring additional mass component participates in the torsional dynamic response as an additional mass.

[0022] Furthermore, adjacent bistable bending-torsional coupling units are connected by flanges, as are the bistable bending-torsional coupling units at the end and the inertial capacity unit.

[0023] Furthermore, the inertial capacity unit includes:

[0024] Flywheel, first-stage planetary transmission disc, and second-stage planetary gear set;

[0025] The first-stage planetary transmission disk and the second-stage planetary gear set together constitute a two-stage planetary transmission mechanism, which is used to convert the relative torsional motion at the input end into the high-speed rotational motion of the internal gear components, thereby generating an inertial reaction torque related to the relative angular acceleration.

[0026] The flywheel, as an additional rotating mass component, is coupled to the two-stage planetary transmission mechanism to increase the equivalent moment of inertia.

[0027] Furthermore, the inertial capacity unit also includes a threaded connecting sleeve and a flywheel connecting support plate; the threaded connecting sleeve connects the flywheel and the flywheel connecting support plate as a whole; the flywheel connecting support plate is coaxially connected to the first-stage planetary transmission plate.

[0028] Furthermore, the secondary planetary gear set includes multiple secondary planetary gears distributed along the circumference.

[0029] On the other hand, the present invention discloses a vibration isolation method for the cascaded bistable warping component and inertial-capacitive coupled torsional isolation device. The device is arranged between the external torsional load input end and the protected structure or transmission component. When the external torsional load is input from the device input end, the torque is sequentially transmitted to at least two bistable bending-torsional coupling units. The bistable warping nonlinear spring components in each level of the bistable bending-torsional coupling unit undergo bending and torsional coupling deformation in sequence, and cross the potential barrier to generate a steady-state transition when the load reaches the critical threshold, thereby causing a sudden change in the internal equilibrium state, release of strain energy and redistribution of force flow, realizing the graded peak reduction and dissipation of the input torsional energy.

[0030] Meanwhile, the outer ring additional mass component participates in the dynamic response as an additional mass, and the entire multi-stage series system expands from a single bistable response to a multistable response;

[0031] The residual torque modulated by the multi-section bistable bending-torsional coupling unit continues to be transmitted to the inertial-capacitive unit. The inertial-capacitive unit converts the relative rotation angle at the input end into the high-speed rotational motion of the internal gear components and flywheel, forming an inertial reaction torque related to the relative angular acceleration.

[0032] The inertial reaction moment works synergistically with the nonlinear restoring force provided by the multi-section bistable bending-torsional coupling unit to simultaneously realize the dual mechanism of energy dissipation during bistable / multistable steady-state transitions and vibration suppression through inertial capacitance amplification, thus jointly suppressing torsional vibration.

[0033] Compared with the prior art, this invention patent has the following beneficial effects:

[0034] 1. Graded Multistable Transitions, Overcoming the Load Adaptability Limitations of Single Bistable Units: Existing bistable torsional vibration damping devices typically contain only one bistable unit, resulting in a narrow effective working range. The bistable warping nonlinear spring assembly of this invention is a three-dimensional nonlinear unit. Through the overlapping configuration of two straight beams preloaded laterally, the assembly achieves an initial prestressed state of bending and torsion coupling. Under external loads, unlike the single-planar bending deformation mode of traditional pure bending bistable components, this assembly undergoes three-dimensional coupled deformation involving both bending and torsion. Because the introduction of torsional deformation expands the deformation mechanism of the structure, the assembly can accumulate and release strain energy more efficiently, thus exhibiting superior nonlinear mechanical response and energy dissipation potential compared to pure bending bistable components. This invention series-connects first, second, and third bistable bending-torsion coupling units with progressively increasing critical transition thresholds along the torque transmission direction. As the torsional load changes from small to large, sequential steady-state transitions are triggered, forming a graded multistable response, resulting in unexpected performance advantages under wide-amplitude and variable-amplitude torsional load environments.

[0035] 2. Geometrically self-realizing bistable state, requiring no external preload or stiffness adjustment: Existing buckling beam bistable structures require axial pressure during installation, which is complex and prone to preload relaxation. The bistable warping nonlinear spring assembly of this invention adopts a preset spatial warping configuration, relying on the initial spatial shape of the elastic beam and end constraints to spontaneously form bistable characteristics, requiring no external preload or on-site adjustment, thus ensuring long-term stability and consistency.

[0036] 3. "Sudden-jump" strain energy release, with energy dissipation efficiency significantly higher than progressive damping: The bistable warping nonlinear spring assembly of this invention undergoes a configurational transition when crossing a potential barrier, accompanied by the instantaneous release and redistribution of elastic strain energy, forming a "sudden-jump" energy dissipation. For impact-type or large-amplitude torsional loads, this mechanism can dissipate a large amount of vibration energy within milliseconds, and its instantaneous energy dissipation density far exceeds that of traditional linear dampers.

[0037] 4. The outer ring additional mass component participates in the dynamic response, enhancing local energy capture: Existing nonlinear torsion devices typically neglect the inertial effect of the mounting boundary. This invention sets an outer ring additional mass component in each bistable bending-torsional coupling unit. This mass component not only serves as the outer mounting end of the spring assembly, but also participates in the torsional dynamic response as an independent mass unit. Through the local inertial coupling of the additional mass with the bistable spring, the energy dissipation efficiency of a single stage is improved.

[0038] 5. Two-stage planetary transmission inertial capacity unit, achieving ultra-large equivalent inertia with lightweight design: Existing inertial capacity devices mostly use lead screw or rack and pinion types, which are relatively large in size. This invention uses a two-stage planetary transmission mechanism coupled with a flywheel to convert the relative torsional motion at the input end into high-speed rotational motion of the internal gear components. It obtains a large equivalent moment of inertia under small actual mass conditions, generating an inertial reaction torque strongly correlated with relative angular acceleration, which is particularly suitable for mass-sensitive rotating machinery.

[0039] 6. Synergistic Effect of Hierarchical Transitions and Capacitive Amplification: In existing technologies, bistable devices and capacitive devices are usually used independently, lacking functional coupling. This invention organically links hierarchical multistable transitions with capacitive amplification vibration suppression: the front-stage bistable unit preferentially clips peaks and achieves multi-stage energy dissipation, while the terminal capacitive unit further suppresses rapidly changing components in the residual bending-torsional coupling response. The two complement each other in both the time and amplitude domains, resulting in an overall vibration isolation effect far exceeding the sum of the individual mechanisms used, producing unexpected synergistic effects.

[0040] 7. Modular series structure with strong engineering adaptability: Each level of bistable bending-torsion coupling unit adopts the same flange interface. The critical transition threshold of each unit can be independently adjusted by changing the number, geometry, material or installation parameters of the spring assembly, realizing "plug and play" parameter adjustment to adapt to different engineering scenarios.

[0041] 8. Compact structure, easy to manufacture and assemble: Each unit is arranged coaxially, and the bistable warping nonlinear spring assembly is evenly distributed along the circumference. The overall components are few and the space utilization rate is high. It can be realized by conventional machining and assembly processes. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0043] Figure 2 This is a schematic diagram of the structure of the first bistable bending-torsional coupling unit of the present invention;

[0044] Figure 3 This is a schematic diagram of the structure of the second bistable bending-torsional coupling unit of the present invention;

[0045] Figure 4 This is a schematic diagram of the structure of the third bistable bending-torsional coupling unit of the present invention;

[0046] Figure 5 This is a schematic diagram of the inertial capacity unit of the present invention;

[0047] Figure 6 This is a schematic diagram of the structure of the central connector of the present invention;

[0048] Figure 7 This is a schematic diagram of the structure of the outer ring additional mass component of the present invention;

[0049] Figure 8 This is a schematic diagram of the structure of the bistable warping nonlinear spring assembly of the present invention;

[0050] Figure 9 This is a schematic diagram of the bistable warping nonlinear spring assembly of the present invention in its initial state.

[0051] Figure 10 This is a schematic diagram and a cross-sectional view (AA) of the flywheel connection support plate of the present invention;

[0052] Figure 11 This is a schematic diagram and a BB sectional view of the threaded connecting sleeve of the present invention;

[0053] Figure 12 This is a schematic diagram and a CC cross-sectional view of the first-stage planetary transmission disk of the present invention;

[0054] Figure 13 This is a schematic diagram of the structure of the second-stage planetary gear set of the present invention;

[0055] Figure 14 A schematic diagram of the force-displacement curve and potential energy curve of a single bistable warping nonlinear spring assembly;

[0056] The annotations in the attached figures are explained as follows:

[0057] 1. First bistable bending-torsional coupling unit; 2. Second bistable bending-torsional coupling unit; 3. Third bistable bending-torsional coupling unit; 4. Inertia-capacitance unit; 11. First bistable warping nonlinear spring assembly; 12. Central connecting flange; 13. Outer ring additional mass component; 14. Outer end mounting connecting block; 21. Second bistable warping nonlinear spring assembly; 31. Third bistable warping nonlinear spring assembly; 41. Flywheel; 42. Threaded connecting sleeve; 43. First-stage planetary transmission disk; 44. Flywheel connecting support disk; 45. Second-stage planetary gear set; 111. First mounting hole at fixed end; 112. Second mounting hole at fixed end; 113. Third mounting hole at fixed end; 114. First warping elastic beam; 115. Second warping elastic beam; 116. First connecting hole at free end; 117. Second connecting hole at free end; 121. Central connecting disk; 122. Spring assembly connecting lug. Detailed Implementation

[0058] To more clearly illustrate the purpose, technical solution, and advantages of this invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be noted that the following embodiments are merely illustrative of the invention and are not intended to limit the scope of protection of the invention. Equivalent substitutions or modifications made by those skilled in the art based on this invention without departing from its conceptual framework should fall within the scope of protection of this invention.

[0059] This embodiment discloses a cascaded bistable warping component and inertial-capacitive coupled torsional vibration isolation device. This component combines a bistable nonlinear elastic mechanism, a multistable series response mechanism, an interface friction energy dissipation mechanism, and an inertial-capacitive amplification mechanism. It can be used for the isolation, dissipation, and control of torsional loads and torsional vibrations in engineering structures, transmission systems, and rotating equipment, so as to improve the operational stability, vibration resistance, and service reliability of related structures or devices in complex dynamic environments, and provide a composite technical solution for torsional vibration control.

[0060] like Figures 1 to 14 As shown, the bending-torsional coupling isolation device includes a first bistable bending-torsional coupling unit 1, a second bistable bending-torsional coupling unit 2, a third bistable bending-torsional coupling unit 3, and an inertial capacitance unit 4, arranged in series along the torque transmission direction. The entire device adopts a coaxial series arrangement, and the external torsional load is supplied by... Figure 1 The input at the right-hand input terminal is shown. The torque is transmitted through the first bistable bending-torsional coupling unit 1, the second bistable bending-torsional coupling unit 2, and the third bistable bending-torsional coupling unit 3, and then to the inertial capacitance unit 4 on the left. Thus, during the torque transmission process, bistable / multistable steady-state transitions, interface friction energy dissipation, and inertial capacitance amplification effects are realized in sequence, achieving the purpose of bending-torsional coupling vibration isolation and vibration control.

[0061] like Figure 1 As shown, the first bistable bending-torsional coupling unit 1, the second bistable bending-torsional coupling unit 2, and the third bistable bending-torsional coupling unit 3 are connected in series along the axial direction, and the units are connected to each other through the central connecting flange 12.

[0062] like Figures 2 to 4 As shown, the three bistable bending-torsional coupling units have the same or similar overall structure, all including an outer ring additional mass 13 disposed on the outer side, a central connecting member disposed at the center position, and several bistable warping nonlinear spring assemblies circumferentially distributed between the outer ring additional mass 13 and the central connecting member. Figure 2 Taking the first bistable bending-torsional coupling unit 1 as an example, it includes a first bistable warping nonlinear spring assembly 11, a central connecting flange 12, an outer ring additional mass component 13, and an outer end mounting connecting block 14. The bistable warping nonlinear spring assembly of this invention is a three-dimensional nonlinear unit. Through the overlapping configuration of two straight beams after left and right pre-stressing, the assembly forms an initial prestressed state of bending and torsion coupling. Under external loads, unlike the single-planar bending deformation mode of traditional pure bending bistable components, this assembly undergoes three-dimensional coupled deformation involving both bending and torsion. Because the introduction of torsional deformation expands the deformation mechanism of the structure, the assembly can accumulate and release strain energy more efficiently, thus exhibiting superior nonlinear mechanical response and energy dissipation potential compared to pure bending bistable components.

[0063] Figure 3 and Figure 4 The second bistable bending-torsion coupling unit 2 and the third bistable bending-torsion coupling unit 3 shown adopt the second bistable warping nonlinear spring assembly 21 and the third bistable warping nonlinear spring assembly 31, respectively. The remaining structure and connection method can be the same as the first bistable bending-torsion coupling unit 1. The geometric parameters, stiffness parameters or installation parameters can also be adjusted according to the multi-level multi-stable design requirements.

[0064] like Figure 6 As shown, the central connector includes a central connecting flange 12, a central connecting plate 121, and spring assembly connecting lugs 122 arranged circumferentially along the central connecting plate 121. The central connecting flange 12 is located on the outside of the central connector and is used to connect with adjacent bistable bending-torsional coupling units or inertial-capacitive units 4 and transmit torque. The central connecting plate 121 is coaxially arranged with the central connecting flange 12, forming the main body of the central connector. Multiple spring assembly connecting lugs 122 are arranged at intervals circumferentially along the central connecting plate 121 and are used to connect with the ends of bistable warping nonlinear spring assemblies. Preferably, the central connector is integrally machined from high-strength steel, alloy steel, stainless steel, or other high-rigidity metal materials. Alternatively, the central connecting flange 12, the central connecting plate 121, and the spring assembly connecting lugs 122 can be manufactured separately and then integrated by welding, bolting, or interference fit.

[0065] like Figure 7 As shown, the outer ring additional mass component 13 is a ring-shaped rigid member, forming an overall ring frame. It has several outer end mounting blocks 14 circumferentially arranged for connection and fixation to the other end of the bistable warping nonlinear spring assembly. Besides serving as the outer mounting boundary, the outer ring additional mass component 13 also participates in the dynamic response as an additional mass during device operation, forming a single-section bistable bending-torsional coupling unit together with the bistable warping nonlinear spring assembly. Therefore, the mass, thickness, cross-sectional dimensions, and material parameters of the outer ring additional mass component 13 can all serve as important variables in the device's dynamic design.

[0066] Preferably, the outer ring additional mass component 13 can be made of steel, aluminum alloy, copper alloy or other materials with certain mass and rigidity, and can be designed as a solid structure, a hollow counterweight structure or a local weight-adding structure according to actual needs.

[0067] like Figure 8 and Figure 9 As shown, the bistable warping nonlinear spring assembly is the core component of this invention for achieving bistable and multistable characteristics. The assembly includes a first mounting hole 111 at a fixed end, a second mounting hole 112 at a fixed end, a third mounting hole 113 at a fixed end, a first warping elastic beam 114, a second warping elastic beam 115, a first connecting hole 116 at a free end, and a second connecting hole 117 at a free end.

[0068] Figure 9 The initial structure of the component is shown. In the initial state, the first warped elastic beam 114 and the second warped elastic beam 115 can be understood as double-beam components extending from the same fixed-end connection to the free end. During actual assembly, the component is formed through installation constraints, relative position adjustments, and pre-set deformation between the fixed end and the free end. Figure 8 The spatially warped configuration shown exhibits bistable nonlinear recovery characteristics. In other words, Figure 9 The initial state shown is the basic form of the component before it is formed or assembled. Figure 8 The state shown is its working form under assembly constraints.

[0069] Specifically, the bistable warping nonlinear spring assembly can be made of spring steel sheets, stainless steel elastic sheets, titanium alloy elastic plates, or fiber-reinforced composite elastic materials. Using steel as a reference, the elastic modulus is E = 2.1 × 10⁻⁶. 11 Pa, Poisson's ratio ν=0.3. The length of the warped component is 1.5m; the width of the component is h=0.632m, and the thickness is 0.02m.

[0070] The fixed end is connected to the central connector or the outer ring additional mass 13 through the first mounting hole 111, the second mounting hole 112, and the third mounting hole 113. The free end is connected to the corresponding connection part through the first connecting hole 116 and the second connecting hole 117. Since the first warped elastic beam 114 and the second warped elastic beam 115 form a preset spatial warped shape after assembly, the component will undergo bending and torsional coupling deformation under torsional load. When the relative rotation angle is small, the component operates around the first stable equilibrium state; when the relative rotation angle increases to a critical value, the component will cross the potential barrier and undergo a steady-state transition, transitioning to another stable equilibrium state, thus exhibiting typical bistable nonlinear mechanical characteristics.

[0071] In this embodiment, the assembly method of the three-section bistable bending-torsional coupling unit can be described as follows: First, the central connector is arranged at the center of each section; then, several bistable warping nonlinear spring assemblies are arranged circumferentially between the central connector and the outer ring additional mass 13, one end of which is connected to the central connector via a spring assembly connecting lug 122, and the other end is connected to the outer ring additional mass 13 via an outer end mounting connecting block 14. During the assembly process, the mounting posture, relative position, and constraint conditions of the ends of the bistable warping nonlinear spring assemblies are adjusted to make... Figure 9 The initial state component shown is transformed into Figure 8The spatially warped working configuration shown establishes the bistable nonlinear recovery characteristics of a single-section element. When multiple such components work together along the circumference, they can provide a larger bending-torsional coupling recovery capability and a more stable circumferential force distribution for a single-section bistable bending-torsional coupled element.

[0072] In this embodiment, the first bistable bending-torsional coupling unit 1, the second bistable bending-torsional coupling unit 2, and the third bistable bending-torsional coupling unit 3 can adopt the same overall configuration. However, the number of bistable warping nonlinear spring assemblies, beam length, beam width, beam thickness, initial warping, material parameters, and the mass parameters of the outer ring additional mass component 13 can all be set to be the same or different according to design requirements. Preferably, the three units can be designed as a gradient configuration with different activation thresholds, so that the first bistable bending-torsional coupling unit 1 responds preferentially under smaller bending-torsional coupling loads, the second bistable bending-torsional coupling unit 2 is activated under medium loads, and the third bistable bending-torsional coupling unit 3 undergoes a steady-state transition under larger bending-torsional coupling loads. In this way, the entire device is composed of multiple bistable units in an axial series manner to form a multistable bending-torsional coupling isolation component, thereby achieving graded response and multi-stage energy dissipation.

[0073] like Figure 5 , Figure 10 , Figure 11 , Figure 12 and Figure 13 As shown, the inertial capacity unit 4 is located at the output end of the three-stage bistable bending-torsional coupling unit, and includes a flywheel 41, a threaded connecting sleeve 42, a first-stage planetary transmission disk 43, a flywheel connecting support disk 44, and a second-stage planetary gear set 45. Figure 5 The overall structure of the inertial capacity unit 4 is shown; Figure 10 The structure and AA sectional view of the flywheel connecting support plate 44 are shown; Figure 11 The structure and BB sectional view of the threaded connecting sleeve 42 are shown; Figure 12 The structure and CC sectional view of the first-stage planetary transmission disk 43 are shown; Figure 13 A schematic diagram of the secondary planetary gear set 45 is shown. It should be noted that... Figure 13 The illustration shows a single secondary planetary gear. In actual operation, the secondary planetary gear set 45 includes four secondary planetary gears distributed along the circumference, which together form the secondary planetary gear set 45.

[0074] The flywheel 41 is an additional rotating mass component in the inertial capacity unit 4, preferably made of steel, alloy steel, or high-density metal. Its outer diameter, thickness, and mass distribution can be designed according to inertial capacity requirements. The threaded connecting sleeve 42 is a rotating structure with internal threads, used to reliably connect the flywheel 41 to the flywheel connecting support plate 44. The flywheel connecting support plate 44 is a disc-shaped support component with a mounting part at its center that mates with the threaded connecting sleeve 42, and multiple connecting holes or support holes around its circumference for connection and installation with other components. The first-stage planetary transmission disk 43 is the core component constituting the first-stage planetary transmission structure, on which a tooth profile or transmission structure adapted to the first-stage planetary transmission is formed. The second-stage planetary gear set 45 consists of four second-stage planetary gears distributed circumferentially, used to constitute the second-stage planetary transmission structure. Through the coupling between the first-stage planetary transmission disk 43 and the second-stage planetary gear set 45, the inertial capacity unit 4 can convert the relative torsional motion at the input end into the high-speed rotational motion of the internal gear components.

[0075] The assembly method of the inertial capacity unit 4 can be as follows: First, connect the threaded connecting sleeve 42 to the flywheel connecting support plate 44, and then assemble the flywheel 41 on the outside of the threaded connecting sleeve 42, so that the flywheel 41 and the flywheel connecting support plate 44 form an integral rotating component; subsequently, assemble the first-stage planetary transmission plate 43 to the flywheel connecting support plate 44 according to the designed axial position, and arrange the second-stage planetary gear set 45 in between, thereby forming a two-stage planetary transmission inertial capacity mechanism. The output end of the third bistable bending-torsional coupling unit 3 is connected to the input side of the inertial capacity unit 4 through the central connecting flange 12, so that the torsional response modulated by the first three bistable bending-torsional coupling units continues to be input into the inertial capacity unit 4. Through the two-stage planetary transmission relationship, the relatively small torsional motion at the input end can drive the internal gear component and the flywheel 41 to rotate at a high angular velocity, thereby generating a large equivalent inertial effect on a macroscopic scale and realizing inertial capacity amplification.

[0076] The working process of this invention is as follows: when the external torsional load is from Figure 1 When the input is applied at the right end, the torque first acts on the central connector of the first bistable bending-torsional coupling unit 1. At this time, relative rotation occurs between the central connector and the outer ring additional mass 13, and the first bistable warping nonlinear spring assembly 11 enters a deformed state. When the load is small, the first bistable warping nonlinear spring assembly 11 generates continuous nonlinear recovery near the first stable equilibrium state; when the load increases to its critical transition threshold, the assembly crosses the potential barrier and enters another stable equilibrium state, thereby releasing part of the strain energy and causing a redistribution of internal force flow. Since the outer ring additional mass 13 participates in the response as an additional mass, this unit not only has bistable nonlinear recovery characteristics, but also has local inertial coupling effect.

[0077] Subsequently, the remaining torque continues to be transmitted to the second bistable bending-torsional coupling unit 2 and the third bistable bending-torsional coupling unit 3. The second bistable warping nonlinear spring assembly 21 and the third bistable warping nonlinear spring assembly 31 are activated sequentially according to their respective structural parameters and threshold characteristics, causing the entire three-section series system to expand from a single bistable response to a multistable response. Therefore, after passing through the three bistable bending-torsional coupling units, the peak value and high-amplitude vibration components of the input torsional load have been significantly reduced.

[0078] When the torsional load continues to be transmitted to the inertial-capacitance unit 4, the first-stage planetary transmission disk 43, the second-stage planetary gear set 45, and the flywheel 41 in the inertial-capacitance unit 4 begin to rotate under the action of the two-stage planetary transmission mechanism. Since the flywheel 41 has a large moment of inertia and the two-stage planetary transmission can amplify the angular velocity, the inertial-capacitance unit 4 can generate a large inertial reaction torque related to the relative angular acceleration. This inertial reaction torque works synergistically with the first three sections of the bistable bending-torsional coupling unit, enabling the present invention to simultaneously possess two mechanisms: nonlinear steady-state transition energy dissipation and inertial-capacitance amplification and vibration suppression. Therefore, it has good adaptability to impact-type, variable-amplitude, and broadband torsional loads.

[0079] like Figure 14 As shown, the force-displacement curve and potential energy curve of a single bistable warped nonlinear spring assembly clearly characterize its bistable mechanical nature. The potential energy curve exhibits a double potential well characteristic, with two stable equilibrium positions corresponding to the positive and negative displacement intervals, respectively, while the middle region corresponds to an unstable equilibrium position. Correspondingly, the restoring force curve shows a zero point in the middle region and exhibits a nonlinear variation on both sides. This curve illustrates that the bistable warped nonlinear spring assembly can transition between two stable configurations under external load, which is the basis for the multi-stable bending-torsional coupling vibration isolation and energy dissipation of this invention. By changing the geometric dimensions, material parameters, initial warping amount, and end installation position of the first warped elastic beam 114 and the second warped elastic beam 115, their force-displacement characteristics, potential energy barrier height, and stable equilibrium position distribution can be further adjusted to meet the design requirements of different engineering scenarios.

[0080] In this embodiment, the central connector, outer ring additional mass 13, flywheel 41, threaded connecting sleeve 42, first-stage planetary transmission disk 43, and flywheel connecting support disk 44 are preferably manufactured from metal materials, and the bistable warping nonlinear spring assembly is preferably formed from elastic sheet metal. Each component can be manufactured using processes such as machining, wire cutting, laser cutting, 3D printing, heat treatment, and surface strengthening, and can be scaled up or down proportionally according to the spatial dimensions, load level, torsional frequency range, and lifespan requirements of the actual application.

[0081] It should be understood that the above embodiments are merely preferred embodiments of the present invention, used to illustrate the technical concept and implementation of the present invention, and do not limit the scope of protection of the present invention. For those skilled in the art, without departing from the essential content of the present invention, adjustments or replacements can be made to the number of each level of bistable bending-torsional coupling units, the number and arrangement of bistable warping nonlinear spring assemblies, and the transmission parameters of the inertia capacity unit 4. These modifications and improvements should all be considered to fall within the scope of protection of the present invention.

[0082] The working process and principle of this invention are as follows:

[0083] The cascaded bistable warping component and inertial-capacitive coupled torsional isolation device described in this invention are arranged between the external torsional load input end and the protected structure or transmission component, such as... Figures 1 to 14 As shown, when an external torsional load is input from the right end of the device, the torque is sequentially transmitted to the first bistable bending-torsional coupling unit 1, the second bistable bending-torsional coupling unit 2, and the third bistable bending-torsional coupling unit 3. The central connecting parts of each stage drive the corresponding bistable warping nonlinear spring assembly to undergo bending and torsional coupling deformation through the central connecting flange 12, the central connecting plate 121, and the spring assembly connecting lug 122. When the load reaches the critical threshold, the spring assembly crosses the potential barrier and generates a steady-state transition, thereby causing a sudden change in the internal equilibrium state, release of strain energy, and redistribution of force flow, achieving graded peak shaving and dissipation of the input torsional energy. At the same time, the outer ring additional mass component 13 participates in the dynamic response as an additional mass. The entire three-stage series system expands from a single bistable response to a multistable response, thereby adapting to variable amplitude, impact, and wideband torsional load environments.

[0084] The residual torque modulated by the first three bistable bending-torsional coupling units continues to be transmitted to the inertial capacity unit 4. The flywheel 41, threaded connecting sleeve 42, first-stage planetary transmission disk 43, flywheel connecting support disk 44, and second-stage planetary gear set 45 in the inertial capacity unit 4 together constitute a two-stage planetary transmission inertial capacity mechanism, which can convert the relative rotation angle at the input end into the high-speed rotational motion of the internal gear components and flywheel 41, thereby generating a large equivalent inertial effect under relatively small actual mass conditions and forming an inertial reaction torque related to the relative angular acceleration. This inertial reaction torque works synergistically with the nonlinear restoring force provided by the first three bistable bending-torsional coupling units, enabling the present invention to simultaneously possess both bistable / multistable steady-state transition energy dissipation and inertial capacity amplification and vibration suppression mechanisms.

[0085] Figure 14 The diagram shows the restoring force-displacement curve and potential energy curve of a single bistable warped connector 1, where the horizontal axis represents displacement, the right vertical axis represents restoring force, and the left vertical axis represents potential energy. Figure 14It is known that a single bistable warped connector exhibits typical nonlinear restoring force characteristics during deformation under stress. Its restoring force curve changes with displacement, showing two stable equilibrium points and one intermediate unstable equilibrium point. The corresponding potential energy curve exhibits a double-well characteristic with two local minima and one intermediate potential barrier. The two local minima correspond to the two stable configurations of the bistable warped connector, and the intermediate potential barrier corresponds to the energy barrier that needs to be overcome when the structure undergoes a configurational transition. When the external input energy is insufficient to overcome the potential barrier, the bistable warping connector vibrates only slightly near a single stable configuration. When the input energy reaches or exceeds the potential barrier threshold, the structure will rapidly transition from one stable state to another, releasing the stored elastic potential energy during the transition, thus forming a significant nonlinear energy dissipation effect. This is the basis for the multi-stable bending-torsional coupling seismic isolation of this invention. Through the coordinated design of the geometric dimensions, material parameters, initial warping amount of the first warping elastic beam 114 and the second warping elastic beam 115, as well as the parameters of the outer ring additional mass component 13 and the inertial capacity unit 4 in each level of unit, this invention can achieve effective control of torsional loads with different frequencies, amplitudes, and time-varying characteristics, thereby significantly improving the vibration resistance, operational stability, and service reliability of the protected structure or system.

[0086] The above embodiments are merely illustrative of preferred embodiments of the present invention and do not limit the concept and scope of the invention. Various modifications and improvements made by those skilled in the art without departing from the design concept of the present invention should be included within the protection scope of the present invention. The technical content for which protection is sought in this invention has been described in detail in the claims.

Claims

1. A cascaded bistable warping component and inertial-capacitive coupled torsional vibration isolation device, characterized in that, It includes at least two bistable bending-torsional coupling units and one inertial capacitance unit (4) arranged in series along the torque transmission direction. Each of the bistable bending-torsional coupling units includes: a central connector, an outer ring additional mass (13), and a plurality of bistable warping nonlinear spring assemblies connected between the central connector and the outer ring additional mass (13); The bistable warping nonlinear spring assembly has a preset spatial warping configuration, which can generate bending and torsional coupled deformation under torsional load and exhibit bistable nonlinear recovery characteristics. External torsional loads are sequentially transmitted to the inertial-capacitive unit (4) through at least two bistable bending-torsional coupling units, so as to achieve torsional isolation through multi-stable steady-state transitions and inertial-capacitive effects.

2. The cascaded bistable warping component and inertial-capacitive coupled torsional vibration isolation device according to claim 1, characterized in that, The at least two bistable bending-torsion coupling units include a first bistable bending-torsion coupling unit (1), a second bistable bending-torsion coupling unit (2), and a third bistable bending-torsion coupling unit (3), which are connected in series along the torque transmission direction. The bistable warping nonlinear spring assembly in the first bistable bending-torsion coupling unit (1), the second bistable bending-torsion coupling unit (2), and the third bistable bending-torsion coupling unit (3) is configured to have successively increasing critical transition thresholds.

3. The cascaded bistable warping component and inertial-capacitive coupled torsional vibration isolation device according to claim 1, characterized in that, The bistable warping nonlinear spring assembly includes: Fixed end connection, free end connection, and a first warping elastic beam (114) and a second warping elastic beam (115) connected between the fixed end connection and the free end connection. The fixed end connection part is provided with at least two fixed end mounting holes for fixed connection with the central connector or the outer ring additional mass part (13); The free end connecting part is provided with at least two free end connecting holes for assembly and connection with the corresponding connecting parts; The first warped elastic beam (114) and the second warped elastic beam (115) form a spatially separated warped shape after assembly, and the two are spaced apart in a direction perpendicular to the plane of the elastic beam.

4. The cascaded bistable warping component and inertial-capacitive coupled torsional vibration isolation device according to claim 1, characterized in that, The central connector includes a central connecting flange (12), a central connecting plate (121), and a plurality of spring assembly connecting lugs (122) arranged circumferentially along the central connecting plate (121); the spring assembly connecting lugs (122) are used to connect to one end of the bistable warping nonlinear spring assembly.

5. The cascaded bistable warping component and inertial-capacitive coupled torsional vibration isolation device according to claim 1, characterized in that, The outer ring additional mass component (13) is a ring-shaped rigid component with multiple outer end mounting connection blocks (14) arranged circumferentially. The outer end mounting connection blocks (14) are used to connect and fix one end of the bistable warping nonlinear spring assembly. The outer ring additional mass component (13) participates in the torsional dynamic response as an additional mass during operation.

6. The cascaded bistable warping component and inertial-capacitive coupled torsional vibration isolation device according to claim 1, characterized in that, The two adjacent bistable bending-torsional coupling units and the bistable bending-torsional coupling unit at the end are connected by flanges.

7. The cascaded bistable warping component and inertial-capacitive coupled torsional vibration isolation device according to claim 1, characterized in that, The inertial capacity unit (4) includes: Flywheel (41), first-stage planetary transmission disc (43) and second-stage planetary gear set (45); The first-stage planetary transmission disk (43) and the second-stage planetary gear set (45) together constitute a two-stage planetary transmission mechanism, which is used to convert the relative torsional motion at the input end into the high-speed rotational motion of the internal gear components, thereby generating an inertial reaction torque related to the relative angular acceleration. The flywheel (41) serves as an additional rotating mass component and is coupled to the two-stage planetary transmission mechanism to increase the equivalent moment of inertia.

8. The cascaded bistable warping component and inertial capacitance coupled torsional vibration isolation device according to claim 7, characterized in that, The inertial capacity unit (4) further includes a threaded connecting sleeve (42) and a flywheel connecting support plate (44); the threaded connecting sleeve (42) connects the flywheel (41) and the flywheel connecting support plate (44) into one unit; the flywheel connecting support plate (44) is coaxially connected to the first-stage planetary transmission plate (43).

9. The cascaded bistable warping component and inertial-capacitive coupled torsional vibration isolation device according to claim 1, characterized in that, The secondary planetary gear set (45) includes multiple secondary planetary gears distributed along the circumference.

10. The seismic isolation method of the cascaded bistable warping component and inertial-capacitive coupled torsional isolation device according to any one of claims 1 to 9, characterized in that, The device is positioned between the external torsional load input end and the protected structure or transmission component. When the external torsional load is input from the device input end, the torque is sequentially transmitted to at least two bistable bending-torsional coupling units. The bistable warping nonlinear spring components in each level of the bistable bending-torsional coupling unit undergo bending and torsional coupling deformation in sequence, and cross the potential barrier to generate a steady-state transition when the load reaches the critical threshold, thereby causing a sudden change in the internal equilibrium state, release of strain energy and redistribution of force flow, achieving graded peak shaving and dissipation of the input torsional energy. Meanwhile, the outer ring additional mass component (13) participates in the dynamic response as an additional mass, and the entire multi-stage series system is extended from a single bistable response to a multistable response; The residual torque after being modulated by multiple bistable bending-torsional coupling units continues to be transmitted to the inertial capacity unit (4). The inertial capacity unit (4) converts the relative rotation angle at the input end into the high-speed rotational motion of the internal gear components and flywheel, forming an inertial reaction torque related to the relative angular acceleration. The inertial reaction moment works synergistically with the nonlinear restoring force provided by the multi-section bistable bending-torsional coupling unit to simultaneously realize the dual mechanism of energy dissipation during bistable / multistable steady-state transitions and vibration suppression through inertial capacitance amplification, thus jointly suppressing torsional vibration.

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