A compression-torsion coupling mechanism and a band-gap adjustable phononic crystal damping device

Abstract

The application discloses a compression-torsion coupling mechanism and a phononic crystal damping device with adjustable band gap, and belongs to the technical field of phononic crystal damping. The compression-torsion coupling mechanism comprises two plastic elastic plates arranged oppositely, the two plastic elastic plates are connected through a plurality of connecting rods, the connecting rods are connected with the corresponding plastic elastic plates through spherical hinges at two ends, electromagnetic coils are arranged on opposite surfaces of the two plastic elastic plates, the two electromagnetic coils are respectively connected with power supplies, and holes matched with tubular target structures are arranged on the plastic elastic plates. The phononic crystal damping device with adjustable band gap comprises a plurality of sleeves, the plurality of sleeves are used for being regularly and intervalled on the tubular target structure, at least one compression-torsion coupling mechanism is arranged between the two sleeves, the compression-torsion coupling mechanism is convenient to design and manufacture, the installation spacing of the phononic crystal damping unit can be changed through remote and reversible electromagnetic driving, and therefore the effect of adjustable band gap is achieved, and the operation is simple.

Description

A pressure-torsion coupling mechanism and a phonon crystal vibration damping device with adjustable bandgap. Technical Field

[0001] This invention belongs to the field of phononic crystal vibration reduction technology, and relates to a pressure-torsion coupling mechanism and a phononic crystal vibration reduction device with adjustable bandgap. Background Technology

[0002] Phononic crystals, as a typical periodic structure, have bandgap characteristics closely related to factors such as the size, shape, and material properties of the periodic structure. Adjustable bandgap phononic crystals can regulate the bandgap by changing their structural parameters or material properties, thereby effectively suppressing vibrations and noise within a specific frequency range. This characteristic has brought revolutionary innovation to vibration reduction and noise reduction technology, breaking the limitations of traditional vibration reduction methods and providing new ideas and methods for solving vibration reduction and noise reduction problems in industrial production and daily life. In many precision equipment and instruments, even minor vibrations and noises can affect their working accuracy and stability. Long-term vibration and noise not only affect the performance of the equipment but may also lead to fatigue damage and accelerated aging of equipment components, shortening the equipment's service life. Adjustable bandgap phononic crystals can precisely control vibrations within a specific frequency range, effectively reducing the impact of vibration on the equipment, thereby improving the equipment's working accuracy and stability, which is of great significance for improving product quality and production efficiency. Furthermore, by reducing the vibration level of the equipment, adjustable bandgap phononic crystals reduce stress concentration and fatigue damage in components, thus helping to extend the equipment's service life and reduce maintenance costs.

[0003] Existing phononic crystals generally suffer from complex structural designs and are difficult to operate when adjusting the band gap. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems of complex structural design and difficult operation when adjusting the bandgap of phononic crystals in the prior art, and to provide a pressure-torsion coupling mechanism and a phononic crystal vibration reduction device with adjustable bandgap.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] In a first aspect, the present invention provides a pressure-torsion coupling mechanism, comprising two plastic elastic plates arranged opposite each other, the two plastic elastic plates being connected by a plurality of connecting rods, the two ends of the connecting rods being connected to the corresponding plastic elastic plates by ball joints; electromagnetic coils are provided on the opposite surfaces of the two plastic elastic plates, and the two electromagnetic coils are respectively connected to a power source; holes that cooperate with a tubular target structure are provided on the plastic elastic plates.

[0007] A further improvement of the present invention is as follows:

[0008] Both of the two plastic elastic plates have annular grooves on their opposite sides; the pressure-torsion coupling mechanism also includes a limiting outer groove that cooperates with the annular grooves.

[0009] The plastic elastic plate has a hexagonal structure; the two plastic elastic plates are connected by six connecting rods.

[0010] The electromagnetic coil is connected to a DC power supply.

[0011] Secondly, the present invention provides a bandgap adjustable phononic crystal vibration damping device using the above-mentioned pressure-torsion coupling mechanism, comprising a plurality of sleeves, the plurality of sleeves being regularly spaced and fitted onto a tubular target structure; at least one pressure-torsion coupling mechanism is provided between two sleeves; the sleeves and the pressure-torsion coupling mechanism are clearance-fitted with the tubular target structure.

[0012] Further improvements are made in the following aspects:

[0013] The sleeve includes two semi-circular ring structures connected by hinges on one side, and electromagnets are provided on the mating surfaces of the other side of the two semi-circular ring structures; the two electromagnets are respectively connected to a power source.

[0014] The electromagnet is connected to a DC power supply.

[0015] The outer angle of the sleeve is less than 360°.

[0016] Both ends of the sleeve are provided with limiting grooves, which are engaged in adjacent annular grooves.

[0017] A gap is provided between the limiting outer groove and the adjacent annular groove.

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

[0019] This invention discloses a pressure-torsion coupling mechanism, which consists of two plastic elastic plates connected by several connecting rods. The connecting rods and the plastic elastic plates are connected by ball joints. Electromagnetic coils are provided on the opposite surfaces of the two plastic elastic plates. The two electromagnetic coils are respectively connected to a power source. When in use, the electromagnetic coils are energized, causing them to generate a magnetic field, thereby generating an interactive magnetic force between the two electromagnetic coils. By changing the magnitude and direction of the input current, the two electromagnetic coils are made to repel or attract each other, thereby causing the pressure-torsion coupling mechanism to stretch or contract, achieving the purpose of changing the distance between the two pressure-torsion coupling mechanisms sleeved on the tubular target structure.

[0020] This invention discloses a bandgap adjustable phononic crystal vibration damping device using the aforementioned pressure-torsion coupling mechanism, comprising several sleeves. During operation, the sleeves are regularly spaced and fitted onto a tubular target structure. At least one pressure-torsion coupling mechanism is provided between two sleeves. In use, an electromagnetic coil is energized to generate a magnetic field, thereby generating an interactive magnetic force between the two electromagnetic coils. By changing the magnitude and direction of the input current, the two electromagnetic coils are made to repel or attract each other, thereby causing the pressure-torsion coupling mechanism to stretch or contract, achieving the purpose of changing the sleeve spacing. The sleeve comprises two semi-circular ring structures connected on one side by hinges. An electromagnet is positioned between the mating surfaces of the two semi-circular ring structures on the other side. The electromagnet is connected to a power source. After determining the spacing of the sleeves, the current input to the electromagnet is increased, causing the sleeve to lock completely, thereby strengthening the contact stiffness between the sleeve and the tubular target structure. This results in a step increase in the structural bending stiffness within the sleeve-covered section. Thus, by installing a sequence of vibration damping units at equal intervals on the tubular target structure, the original tubular target structure is transformed into a phononic crystal structure, generating a bending wave bandgap. This prevents bending waves from propagating within the tubular target structure, achieving a vibration damping effect. The introduction of a pressure-torsion coupling mechanism allows for remote, reversible electromagnetic drive to change the installation spacing of the phononic crystal vibration damping units, achieving an adjustable bandgap. At least one pressure-torsion coupling mechanism is installed between each set of sleeves; multiple sets can be installed to increase the range of sleeve installation spacing, thereby increasing the adjustment range of the bending wave bandgap frequency and achieving vibration damping over a wider range of target frequencies. This invention is easy to design and manufacture. The installation spacing of the phonon crystal damping unit can be changed remotely and reversibly via electromagnetic drive, thereby achieving an adjustable bandgap effect. It is also easy to operate.

[0021] Furthermore, the outer angle of the sleeve is less than 360° due to the openings on both sides, which allows the inner wall of the sleeve to fit tightly against the tubular target structure.

[0022] Furthermore, both ends of the sleeve are provided with limiting grooves, which are engaged in adjacent annular grooves. When the sleeve is locked, the plastic elastic plate and the sleeve can only rotate relative to each other around the axial direction. The outer contact surface of the annular groove and the inner contact surface of the limiting groove should have a gap to ensure that the axial torsion of the pressure-torsion coupling mechanism is not restricted after the sleeve is locked. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of a pressure-torsion coupling mechanism according to the present invention;

[0025] Figure 2 is a schematic diagram of the sleeve structure in a bandgap adjustable phononic crystal vibration damping device of the present invention;

[0026] Figure 3 is a schematic diagram of the working structure of a bandgap adjustable phononic crystal vibration damping device according to the present invention.

[0027] Wherein: 1-sleeve; 2-tubular target structure; 3-plastic elastic plate; 4-electromagnet; 5-electromagnetic coil; 6-limiting outer groove; 7-circular groove; 8-hub; 9-power supply; 31-hinge; 41-connecting rod; 42-ball joint; 51-wire. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings:

[0035] Referring to Figure 1, this invention discloses a pressure-torsion coupling mechanism, comprising two plastic elastic plates 3 arranged opposite each other, the two plastic elastic plates 3 being connected by a plurality of connecting rods 41, the two ends of the connecting rods 41 being connected to the corresponding plastic elastic plates 3 via ball joints 42; each of the two plastic elastic plates 3 having an electromagnetic coil 5 on its opposite surface, and each of the two electromagnetic coils 5 being connected to a power source; each plastic elastic plate 3 having a hole for engaging with a tubular target structure 2; each of the two plastic elastic plates 3 having an annular groove 7 on its opposite back surface; the pressure-torsion coupling mechanism further includes a limiting outer groove 6 that engages with the annular groove 7. The plastic elastic plates 3 are hexagonal in shape; the two plastic elastic plates 3 are connected by six connecting rods 41. The power source connected to the electromagnetic coils 5 is a DC power source. The movement directions of the pressure-torsion coupling mechanism in this invention include the pressure direction and the tension direction. When in use, the electromagnetic coil is energized to generate a magnetic field, thereby generating an interactive magnetic force between the two electromagnetic coils. By changing the magnitude and direction of the input current, the two electromagnetic coils are made to repel or attract each other, thereby causing the pressure-torsion coupling mechanism to stretch or contract, thus achieving the purpose of changing the distance between the two pressure-torsion coupling mechanisms sleeved on the tubular target structure.

[0036] Referring to Figures 2 and 3, this invention discloses a bandgap adjustable phonon crystal vibration damping device using the aforementioned pressure-torsion coupling mechanism, comprising a plurality of sleeves 1, which are regularly spaced and fitted onto a tubular target structure 2; at least one pressure-torsion coupling mechanism is provided between two sleeves 1; the sleeves 1 and the pressure-torsion coupling mechanism are clearance-fitted with the tubular target structure 2. Each sleeve 1 includes two semi-circular ring structures connected on one side by hinges 31, and an electromagnet 4 is provided between the mating surfaces of the two semi-circular ring structures on the other side; the electromagnet 4 is connected to a power source. The power source connected to the electromagnet 4 is a DC power source. The outer angle of the sleeve 1 is less than 360°. Limiting grooves 6 are provided at both ends of each sleeve 1, and the limiting grooves 6 are engaged in adjacent annular grooves 7. A gap is provided between the limiting grooves 6 and the adjacent annular grooves 7. During operation, several sleeves are regularly spaced and fitted onto the tubular target structure. At least one pressure-torsion coupling mechanism is set between two sleeves. When in use, the electromagnetic coil is energized, which generates a magnetic field, thereby creating an interactive magnetic force between the two electromagnetic coils. By changing the magnitude and direction of the input current, the two electromagnetic coils are made to repel or attract each other, which causes the pressure-torsion coupling mechanism to stretch or contract, thus changing the sleeve spacing. The sleeve comprises two semi-circular ring structures connected on one side by hinges. An electromagnet is positioned between the mating surfaces of the two semi-circular ring structures on the other side. The electromagnet is connected to a power source. After determining the sleeve spacing, the current input to the electromagnet is increased to fully lock the sleeve, thereby strengthening the contact stiffness between the sleeve and the tubular target structure. This results in a step increase in the structural bending stiffness within the sleeve-covered section. Thus, by installing a sequence of vibration damping units at equal intervals on the tubular target structure, the original tubular target structure is transformed into a phononic crystal structure, generating a bending wave bandgap. This prevents bending waves from propagating within the tubular target structure, achieving a vibration damping effect. The introduction of a pressure-torsion coupling mechanism allows for remote, reversible electromagnetic drive to change the installation spacing of the phononic crystal vibration damping units, achieving an adjustable bandgap. At least one pressure-torsion coupling mechanism is installed between each set of sleeves. Multiple pressure-torsion coupling mechanisms can be installed to increase the range of sleeve installation spacing, thereby increasing the adjustment range of the bending wave bandgap frequency and achieving vibration damping over a wider range of target frequencies. This invention is easy to design and manufacture. The installation spacing of the phonon crystal damping unit can be changed remotely and reversibly via electromagnetic drive, thereby achieving an adjustable bandgap effect. It is also easy to operate.

[0037] The working principle of this invention is as follows:

[0038] When the vibration damping unit described in this invention is installed on a target tubular structure to form a phonon transistor, the eigenvalue problem of the overall structure can be expressed as:

[0039]

[0040] In the formula: ω is the vibration frequency, U is the displacement vector of the overall structure, and K bp M is the stiffness matrix of the target tubular structure. bp Let K be the mass matrix of the target tubular structure. as M is the additional stiffness matrix generated by installing this vibration damping unit. as The additional mass matrix generated by installing this vibration damping unit.

[0041] Taking a metal tube as an example, assuming its inner diameter is 4mm, outer diameter is 5mm, Young's modulus is 160GPa, Poisson's ratio is 0.3, and density is 7617kg / m3, and assuming that the same material sleeves with a length of 80mm, an inner diameter of 5mm, and an outer diameter of 10mm are installed at equal intervals, it can be calculated using the above formula that when the center-to-center spacing of the sleeves is 100mm, a bending wave bandgap with a frequency range of 1380Hz-2730Hz and a bandwidth of 1350Hz can be formed within the overall structure; when the center-to-center spacing of the sleeves is 140mm, a bending wave bandgap with a frequency range of 769Hz-976Hz and a bandwidth of 207Hz can be formed within the overall structure.

[0042] The working process of this invention is as follows:

[0043] As shown in Figure 2, a phononic crystal vibration reduction method with adjustable bandgap is described. Each vibration reduction unit includes two semi-circular sleeves 1, electromagnets 4, and hinges 31. The hinges 31 are located at one end of the sleeve 1 and are used to connect the two sleeves 1. Two electromagnets 4 are bonded to the inner walls of the cross-section of the sleeve 1 relative to the other side of the hinge 31. During installation, the two sleeves 1 are first fastened to the tubular target structure 2. When the positive and negative terminals of the circuit are connected to the hub 8 and energized, each pair of electromagnets 4 will generate a magnetic attraction force, thereby allowing the sleeves 1 to be installed on the tubular target structure 2 without falling off. At this time, a step improvement in structural quality is generated within the section covered by the sleeves 1.

[0044] As shown in Figures 1 and 3, the pressure-torsion coupling mechanism includes two plastic elastic plates 3, an annular groove 7, six connecting rods 41, and corresponding ball joints 42. The outer wall of the annular groove 7 matches the inner wall of the limiting outer groove 6 on the sleeve 1, leaving a certain gap. The annular groove 7 and the limiting outer groove 6 should be smooth contact surfaces. Each plastic elastic plate 3 should have an opening 71 in the center that matches the tubular target structure 2. Both ends of each connecting rod 41 are connected to the plastic elastic plate 3 through ball joints 42. Each plastic elastic plate 3 is fixedly connected to an electromagnetic coil 5. In use, the strength and direction of the magnetic field are adjusted by controlling the current in the electromagnetic coil 5. By using a suitable power supply and control system, such as a frequency converter, the frequency and amplitude of the current can be adjusted, enabling more precise control. After energization, the two electromagnetic coils 5 in the same pressure-torsion coupling mechanism generate a magnetic field. By changing the intensity and direction of the current connected to the two electromagnetic coils 5, the two electromagnetic coils 5 are made to repel or attract each other, thereby driving the two plastic elastic plates 3 to rotate axially. This causes the pressure-torsion coupling mechanism to stretch or contract, thus changing the spacing of the sleeve 1 unit. After determining the spacing of the sleeve 1 unit, the current input in the electromagnet 4 is increased to completely lock the sleeve 1, thereby strengthening the contact stiffness between the sleeve 1 and the tubular target structure 2. Within the sleeve-covered section, a step increase in the structural bending stiffness is generated. In this way, by installing a sequence of vibration damping units at equal intervals on the tubular target structure 2, the original tubular target structure 2 is transformed into a phonon crystal structure, thereby generating a bending wave bandgap and preventing bending waves from propagating within the tubular target structure 2, thus achieving a vibration damping effect. The introduction of the pressure-torsion coupling mechanism can change the installation spacing of the sleeve 1 through remote, reversible electromagnetic drive, thereby achieving an adjustable bandgap effect.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bandgap adjustable phonon crystal vibration damping device based on a compression-torsion coupling mechanism, characterized in that, The device includes several sleeves (1), which are used to be regularly spaced on the tubular target structure (2); at least one pressure-torsion coupling mechanism is provided between two sleeves (1); the sleeves (1) and the pressure-torsion coupling mechanism are clearance-fitted with the tubular target structure (2); the pressure-torsion coupling mechanism includes two plastic elastic plates (3) arranged opposite to each other, the two plastic elastic plates (3) are connected by several connecting rods (41), and the two ends of the connecting rods (41) are connected to the corresponding plastic elastic plates (3) by ball joints (42); the two plastic elastic plates (3) are... Electromagnetic coils (5) are provided on opposite surfaces of the plate (3), and the two electromagnetic coils (5) are respectively connected to a power source; the plastic elastic plate (3) is provided with holes that cooperate with the tubular target structure (2); the two plastic elastic plates (3) are provided with annular grooves (7) on opposite back surfaces; the pressure-torsion coupling mechanism also includes a limiting outer groove (6) that cooperates with the annular groove (7); the plastic elastic plate (3) is a hexagonal structure; the two plastic elastic plates (3) are connected by six connecting rods (41); the power source connected to the electromagnetic coils (5) is a DC power source.

2. The bandgap adjustable phononic crystal vibration damping device according to claim 1, characterized in that, The sleeve (1) includes two semi-circular ring structures connected on one side by a hinge (31), and electromagnets (4) are provided on the mating surfaces of the other side of the two semi-circular ring structures; the two electromagnets (4) are respectively connected to a power source.

3. The bandgap adjustable phononic crystal vibration damping device according to claim 2, characterized in that, The electromagnet (4) is connected to a DC power supply.

4. The bandgap adjustable phononic crystal vibration damping device according to claim 2, characterized in that, The outer angle of the sleeve (1) is less than 360°.

5. The bandgap adjustable phononic crystal vibration damping device according to claim 1, characterized in that, Both ends of the sleeve (1) are provided with limiting grooves (6), and the limiting grooves (6) are engaged in the adjacent annular grooves (7).

6. The bandgap adjustable phononic crystal vibration damping device according to claim 5, characterized in that, A gap is provided between the limiting outer groove (6) and the adjacent annular groove (7).

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