Pressure-torsion coupling mechanism and photonic crystal vibration damper with adjustable band gap

Abstract

The invention discloses a pressure-torsion coupling mechanism and a photonic crystal vibration damper with an adjustable band gap, and belongs to the technical field of photonic crystal vibration damping. The pressure-torsion coupling mechanism comprises two plastic elastic plates which are oppositely arranged, the two plastic elastic plates are connected through a plurality of connecting rods, and the two ends of the connecting rods are connected with the corresponding plastic elastic plates through spherical hinges; electromagnetic coils are arranged on the opposite surfaces of the two plastic elastic plates; the two electromagnetic coils are respectively connected with a power supply; a hole matched with a tubular target structure is formed in the plastic elastic plate. A photonic crystal vibration damper with an adjustable band gap comprises a plurality of sleeves, and the sleeves are used for regularly sleeving a tubular target structure at intervals; at least one pressure-torsion coupling mechanism is arranged between the two sleeves; the device is convenient to design and manufacture, the mounting distance of the photonic crystal vibration reduction units can be changed through remote and reversible electromagnetic driving, so that the band gap adjustable effect is achieved, and operation is easy and convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of phononic crystal vibration reduction, and relates to a compression-torsion coupling mechanism and a phononic crystal vibration reduction device with adjustable band gap. Background Art

[0002] As a typical periodic structure, the band gap characteristics of phononic crystals are closely related to the size, shape, material properties and other factors of the periodic structure. Phononic crystals with adjustable band gaps can adjust the band gap by changing their structural parameters or material properties, thereby effectively suppressing vibration and noise within a specific frequency range. This feature has brought revolutionary innovation to vibration and noise reduction technology, breaking the limitations of traditional vibration reduction methods, and providing new ideas and methods for solving vibration and noise reduction problems in industrial production and daily life. In many precision equipment and instruments, tiny vibrations and noise may affect the accuracy and stability of their work. Long-term vibration and noise will not only affect the performance of the equipment, but also cause fatigue damage and accelerated aging of equipment parts, shortening the service life of the equipment. Phononic crystals with adjustable band gaps can accurately control vibrations within a specific frequency range, effectively reduce the impact of vibrations on the equipment, thereby improving the working accuracy and stability of the equipment, which is of great significance for improving product quality and production efficiency. In addition, phononic crystals with adjustable band gaps reduce stress concentration and fatigue damage of parts by reducing the vibration level of the equipment, thereby helping to extend the service life of the equipment and reduce maintenance costs.

[0003] Existing phononic crystals generally have the problem of complex structural design and difficulty in operation when adjusting the band gap. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems in the prior art that phononic crystals generally have complex structural designs and are difficult to operate when adjusting the band gap, and to provide a compression-torsion coupling mechanism and a phononic crystal vibration reduction device with adjustable band gap.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a compression-torsion coupling mechanism, comprising two plastic elastic plates arranged opposite to 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 arranged on the opposite surfaces of the two plastic elastic plates, the two electromagnetic coils are respectively connected to a power source; and holes are arranged on the plastic elastic plates to cooperate with a tubular target structure.

[0006] The present invention is further improved in that: Circular ring grooves are arranged on the opposite back surfaces of the two plastic elastic plates; and the compression-torsion coupling mechanism further comprises a limiting outer groove matched with the circular ring groove.

[0007] The plastic elastic plate is a hexagonal structure; the two plastic elastic plates are connected by six connecting rods.

[0008] The power source connected to the electromagnetic coil is a direct current power source.

[0009] In the second aspect, the present invention provides a band gap adjustable phononic crystal vibration reduction device using the above-mentioned compression-torsion coupling mechanism, comprising a plurality of sleeves, wherein the plurality of sleeves are used to be regularly spaced on a tubular target structure; at least one compression-torsion coupling mechanism is arranged between the two sleeves; the sleeves and the compression-torsion coupling mechanism are clearance-fitted with the tubular target structure.

[0010] Further improvements are: The sleeve comprises two semicircular ring structures connected by hinges on one side, and electromagnets are arranged on the mating surfaces on the other sides of the two semicircular ring structures; the two electromagnets are respectively connected to power sources.

[0011] The power source connected to the electromagnet is a DC power source.

[0012] The outer side angle of the sleeve is less than 360°.

[0013] Both ends of the sleeve are provided with limiting outer grooves, and the limiting outer grooves are clamped in adjacent annular grooves.

[0014] A gap is arranged between the limiting outer groove and the adjacent annular groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a compression-torsion coupling mechanism, which consists of two plastic elastic plates connected by a plurality of connecting rods. The connecting rods and the plastic elastic plates are connected by ball joints. Electromagnetic coils are arranged on opposite surfaces of the two plastic elastic plates. The two electromagnetic coils are respectively connected to power supplies. When in use, the electromagnetic coils are energized to generate a magnetic field, thereby generating an interactive magnetic field force between the two electromagnetic coils. By changing the size and direction of the input current, the two electromagnetic coils are repelled or attracted, thereby stretching or contracting the compression-torsion coupling mechanism, thereby achieving the purpose of changing the distance between the two compression-torsion coupling mechanisms sleeved on a tubular target structure.

[0016] The present invention discloses a bandgap adjustable phononic crystal vibration reduction device using the above-mentioned compression-torsion coupling mechanism, comprising a plurality of sleeves. When working, the plurality of sleeves are used to be regularly sleeved on a tubular target structure, and at least one compression-torsion coupling mechanism is arranged between two sleeves. When in use, the electromagnetic coil is energized to generate a magnetic field, thereby generating an interactive magnetic field force between the two electromagnetic coils. By changing the size and direction of the input current, the two electromagnetic coils are repelled or attracted, thereby causing the compression-torsion coupling mechanism to stretch or contract, thereby achieving the purpose of changing the sleeve spacing. The sleeve includes two semicircular ring structures connected by hinges on one side, and an electromagnet is arranged between the mating surfaces on the other side of the two semicircular ring structures. The electromagnet is connected to a power supply. After the spacing of the sleeves is determined, the current input in the electromagnet is strengthened to completely lock the sleeves, thereby strengthening the contact stiffness between the sleeves and the tubular target structure, and generating a step increase in the structural bending stiffness within the sleeve coverage section; in this way, by installing a sequence of vibration reduction units at equal intervals on the tubular target structure, the original tubular target structure is transformed into a phononic crystal structure, thereby generating a bending wave band gap, preventing the bending wave from propagating in the tubular target structure, so as to achieve a vibration reduction effect. The introduction of a compression-torsion coupling mechanism can change the installation spacing of the phononic crystal vibration reduction unit through remote and reversible electromagnetic drive, thereby achieving an adjustable band gap effect. At least one set of compression-torsion coupling mechanisms is installed between each set of sleeves, and multiple sets of compression-torsion coupling mechanisms can also be installed to increase the range of the sleeve installation spacing, thereby increasing the adjustment range of the bending wave band gap frequency, and achieving vibration reduction of a wider range of target frequencies. The invention is easy to design and manufacture, and can change the installation spacing of the phononic crystal vibration reduction unit through remote and reversible electromagnetic driving, thereby achieving an adjustable band gap effect, and is easy to operate.

[0017] Furthermore, the outer angle of the sleeve is less than 360° due to the arrangement of the openings on both sides, so that the inner wall of the sleeve fits tightly with the tubular target structure.

[0018] Furthermore, both ends of the sleeve are provided with limiting outer grooves, which are clamped in the 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, and a gap should be provided between the outer contact surface of the annular groove and the inner contact surface of the limiting outer groove to ensure that the axial torsion of the compression-torsion coupling mechanism will not be restricted after the sleeve is locked. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1It is a schematic diagram of the sleeve structure in a phononic crystal vibration reduction device with adjustable band gap in the present invention; Figure 2 It is a structural schematic diagram of a compression-torsion coupling mechanism in the present invention; Figure 3 The figure is a schematic diagram of the working structure of a phononic crystal vibration reduction device with adjustable band gap in the present invention.

[0021] Among them: 1-sleeve; 2-tubular target structure; 3-plastic elastic plate; 4-electromagnet; 5-electromagnetic coil; 6-limiting outer groove; 7-annular groove; 8-hub; 9-power supply; 31-hinge; 41-connecting rod; 42-ball joint; 51-conductor. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1 The present invention discloses a compression-torsion coupling mechanism, comprising two plastic elastic plates 3 arranged opposite to each other, the two plastic elastic plates 3 are connected by a plurality of 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; electromagnetic coils 5 are arranged on the opposite surfaces of the two plastic elastic plates 3, and the two electromagnetic coils 5 are respectively connected to a power source; holes are arranged on the plastic elastic plates 3 to match the tubular target structure 2. Circular grooves 7 are arranged on the opposite back surfaces of the two plastic elastic plates 3; the compression-torsion coupling mechanism also includes a limiting outer groove 6 matched with the circular 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 coil 5 is a DC power source. The movement direction of the compression-twist coupling mechanism in the present invention includes 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 field force between the two electromagnetic coils. By changing the size and direction of the input current, the two electromagnetic coils are repelled or attracted to each other, thereby causing the compression-twist coupling mechanism to stretch or contract, thereby achieving the purpose of changing the distance between the two compression-twist coupling mechanisms sleeved on the tubular target structure.

[0029] See also Figure 2 and Figure 3The present invention discloses a bandgap adjustable phononic crystal vibration reduction device using the above-mentioned compression-torsion coupling mechanism, comprising a plurality of sleeves 1, wherein the plurality of sleeves 1 are used to be regularly spaced on a tubular target structure 2; at least one compression-torsion coupling mechanism is arranged between the two sleeves 1; the sleeves 1 and the compression-torsion coupling mechanism are clearance-matched with the tubular target structure 2. The sleeve 1 comprises two semicircular ring structures connected by a hinge 31 on one side, and an electromagnet 4 is arranged between the mating surfaces on the other side of the two semicircular ring structures; 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°. Both ends of the sleeve 1 are provided with a limiting outer groove 6, and the limiting outer groove 6 is clamped in the adjacent annular groove 7. A gap is arranged between the limiting outer groove 6 and the adjacent annular groove 7. During operation, a number of sleeves are used to be regularly spaced on the tubular target structure, and at least one compression-torsion coupling mechanism is arranged between the two sleeves. When in use, the electromagnetic coil is energized to generate a magnetic field, thereby generating an interactive magnetic field force between the two electromagnetic coils. By changing the size and direction of the input current, the two electromagnetic coils are repelled or attracted, thereby causing the compression-torsion coupling mechanism to stretch or contract, thereby achieving the purpose of changing the sleeve spacing. The sleeve includes two semicircular ring structures connected by hinges on one side, and an electromagnet is arranged between the mating surfaces on the other side of the two semicircular ring structures, and the electromagnet is connected to a power supply. After the spacing of the sleeves is determined, the current input in the electromagnet 4 is strengthened to completely lock the sleeves, thereby strengthening the contact stiffness between the sleeves and the tubular target structure, and generating a step increase in the structural bending stiffness within the sleeve coverage section; in this way, by installing a sequence of vibration reduction units at equal intervals on the tubular target structure, the original tubular target structure is transformed into a phononic crystal structure, thereby generating a bending wave band gap, preventing the bending wave from propagating in the tubular target structure, so as to achieve a vibration reduction effect, and the introduction of a compression-torsion coupling mechanism can change the installation spacing of the phononic crystal vibration reduction unit through remote and reversible electromagnetic drive, thereby achieving an adjustable band gap effect. At least one set of compression-torsion coupling mechanisms is installed between each set of sleeves, and multiple sets of compression-torsion coupling mechanisms can also be installed to increase the range of the sleeve installation spacing, thereby increasing the adjustment range of the bending wave band gap frequency, and achieving vibration reduction of a wider range of target frequencies. The invention is easy to design and manufacture, and can change the installation spacing of the phononic crystal vibration reduction unit through remote and reversible electromagnetic driving, thereby achieving an adjustable band gap effect, and is easy to operate.

[0030] The working principle of the present invention is as follows: When the vibration reduction unit of the present invention is installed on the target tubular structure to form a phonon transistor, the eigenvalue problem of the overall structure can be expressed as:

[0031] Where: ω is the vibration frequency, U is the displacement vector of the overall structure, K bpis the stiffness matrix of the target tubular structure, M bp is the mass matrix of the target tubular structure, K as The additional stiffness matrix generated by installing this vibration reduction unit, M as The additional mass matrix generated for installing this vibration reduction unit.

[0032] Take a metal tube as an example, assuming that its inner diameter is 4mm, outer diameter is 5mm, Young's modulus is 160GPa, Poisson's ratio is 0.3, density is 7617kg / m3, and the metal tube is equally spaced to install a sleeve of the same material with a length of 80mm, inner diameter of 5mm, and outer diameter of 10mm. Using the above formula, it can be calculated that when the center spacing of the sleeve is 100mm, a bending wave band gap with a frequency range of 1380Hz-2730Hz and a bandwidth of 1350Hz can be formed in the overall structure; when the center spacing of the sleeve is 140mm, a bending wave band gap with a frequency range of 769Hz-976Hz and a bandwidth of 207Hz can be formed in the overall structure.

[0033] The working process of the present invention is as follows: like Figure 2 As shown, a bandgap adjustable phononic crystal vibration reduction method, each group of vibration reduction units includes two semicircular ring sleeves 1, electromagnets 4, and hinges 31, the hinges 31 are arranged at the opening of one end of the sleeves 1, and are used to connect the two sleeves 1, and two electromagnets 4 are bonded to the two sides of the cross-sectional inner wall of the sleeve 1 at the opening on the other side of the hinge 31; when installing, the two sleeves 1 are first interlocked on the tubular target structure 2, and when the positive and negative ends of the circuit are connected to the hub 8 and powered on, each pair of electromagnets 4 will generate a magnetic field force of attraction, so that the sleeves 1 are installed on the tubular target structure 2 without falling off, and at this time, a step improvement in the structural quality is generated within the sleeve 1 coverage section; like Figure 1 , Figure 3As shown, the compression-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 and leaves a certain gap. The annular groove 7 and the limiting outer groove 6 should be smooth contact surfaces. An opening 71 matching the tubular target structure 2 should be set in the middle of each plastic elastic plate 3. The two ends of each connecting rod 41 are connected to the plastic elastic plate 3 through a ball joint 42. Each plastic elastic plate 3 is fixedly connected to an electromagnetic coil 5. When in use, the intensity 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, and more precise control can be achieved. After power is turned on, the two electromagnetic coils 5 in the same compression-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 repelled or attracted, thereby driving the two plastic elastic plates 3 to rotate axially, so that the compression-torsion coupling mechanism is stretched or contracted, and then the spacing of the casing 1 units is changed. After determining the spacing of the casing 1 units, the current input in the electromagnet 4 is strengthened to completely lock the casing 1, thereby strengthening the contact stiffness between the casing 1 and the tubular target structure 2, and generating a step increase in the structural bending stiffness within the casing coverage section. In this way, by installing a sequence of vibration reduction units at equal intervals on the tubular target structure 2, the original tubular target structure 2 is transformed into a phononic crystal structure, thereby generating a bending wave band gap, preventing the bending wave from propagating in the tubular target structure 2, so as to achieve a vibration reduction effect. The introduction of the compression-torsion coupling mechanism can change the installation spacing of the casing 1 through remote and reversible electromagnetic drive, thereby achieving an adjustable band gap effect.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compression-torsion coupling mechanism, characterized in that: The invention comprises two plastic elastic plates (3) arranged opposite to each other, the two plastic elastic plates (3) being connected via 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); electromagnetic coils (5) are arranged on the opposite surfaces of the two plastic elastic plates (3), the two electromagnetic coils (5) being respectively connected to a power source; and holes are arranged on the plastic elastic plates (3) for matching with the tubular target structure (2).

2. The compression-torsion coupling mechanism according to claim 1, characterized in that: Circular ring grooves (7) are provided on the opposite back surfaces of the two plastic elastic plates (3); the compression-torsion coupling mechanism also includes a limiting outer groove (6) that matches the circular ring groove (7).

3. The compression-torsion coupling mechanism according to claim 1, characterized in that: The plastic elastic plate (3) is a hexagonal structure; the two plastic elastic plates (3) are connected via six connecting rods (41).

4. The compression-torsion coupling mechanism according to claim 1, characterized in that: The power source connected to the electromagnetic coil (5) is a direct current power source.

5. A bandgap adjustable phononic crystal vibration reduction device using the compression-torsion coupling mechanism of claims 1-4, characterized in that: The invention comprises a plurality of sleeves (1), wherein the plurality of sleeves (1) are used to be sleeved on a tubular target structure (2) at regular intervals; at least one compression-torsion coupling mechanism is arranged between two sleeves (1); and the sleeves (1) and the compression-torsion coupling mechanism are clearance-fitted with the tubular target structure (2).

6. The bandgap adjustable phononic crystal vibration reduction device according to claim 5, characterized in that: The sleeve (1) comprises two semi-circular ring structures connected by a hinge (31) on one side, and electromagnets (4) are provided on the mating surfaces on the other sides of the two semi-circular ring structures; the two electromagnets (4) are respectively connected to a power source.

7. The bandgap adjustable phononic crystal vibration reduction device according to claim 6, characterized in that: The power source connected to the electromagnet (4) is a direct current power source.

8. The bandgap adjustable phononic crystal vibration reduction device according to claim 6, characterized in that: The outer side angle of the sleeve (1) is less than 360°.

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

10. The bandgap adjustable phononic crystal vibration reduction device according to claim 9, characterized in that: A gap is provided between the limiting outer groove (6) and the adjacent annular groove (7).

Images