阅读说明：本技术 基于同步开关阻尼技术的电磁-压电复合振动控制装置 (Electromagnetic-piezoelectric composite vibration control device based on synchronous switch damping technology ) 是由 蒲华燕 张动 王敏 罗均 孙翊 段超群 张顺琦 彭艳 谢少荣 于 2019-09-23 设计创作，主要内容包括：本发明公开一种基于同步开关阻尼技术的电磁-压电复合振动控制装置,涉及振动抑制技术领域,上刚性框架设置于下刚性框架的上部,上导向部件安装于上刚性框架中,下导向部件安装于下刚性部件中,导杆套设于上导向部件和下导向部件中,负载平台固定于导杆的上端,上滚轮机构和下滚轮机构均固定套设于导杆上且位于上导向部件和下导向部件之间,电磁机构固定套设于导杆外,弹性部件套设于下滚轮机构外,各压电悬臂梁的一端固定于上刚性框架和下刚性框架之间,各压电悬臂梁的另一端设置于上滚轮机构和下滚轮机构之间,压电悬臂梁和电磁机构分别与电路系统连接。该装置结构简单,性能可靠,无需外部提供电压源,具有自适应特性。(The invention discloses an electromagnetic-piezoelectric composite vibration control device based on a synchronous switch damping technology, which relates to the technical field of vibration suppression, an upper rigid frame is arranged at the upper part of a lower rigid frame, an upper guide part is arranged in the upper rigid frame, the lower guide part is installed in the lower rigid part, the guide rod sleeve is arranged in the upper guide part and the lower guide part, the load platform is fixed at the upper end of the guide rod, the upper roller mechanism and the lower roller mechanism are fixedly sleeved on the guide rod and located between the upper guide part and the lower guide part, the electromagnetic mechanism is fixedly sleeved outside the guide rod, the elastic part is sleeved outside the lower roller mechanism, one end of each piezoelectric cantilever beam is fixed between the upper rigid frame and the lower rigid frame, the other end of each piezoelectric cantilever beam is arranged between the upper roller mechanism and the lower roller mechanism, and the piezoelectric cantilever beams and the electromagnetic mechanism are respectively connected with a circuit system. The device has simple structure and reliable performance, does not need an external voltage source and has self-adaptive characteristic.)

1. an electromagnetic-piezoelectric composite vibration control device based on a synchronous switch damping technology is characterized by comprising a load platform, a guide rod, an upper rigid frame, a lower rigid frame, an upper guide part, a lower guide part, an upper roller mechanism, a lower roller mechanism, an elastic part, an electromagnetic mechanism, a circuit system and a plurality of piezoelectric cantilever beams, wherein the upper rigid frame is arranged at the upper part of the lower rigid frame, the upper guide part is arranged in the upper rigid frame, the lower guide part is arranged in the lower rigid frame, the guide rod is sleeved in the upper guide part and the lower guide part, the load platform is fixed at the upper end of the guide rod, the upper roller mechanism and the lower roller mechanism are both fixedly sleeved on the guide rod and positioned between the upper guide part and the lower guide part, and the electromagnetic mechanism is fixedly sleeved outside the guide rod, the elastic component is sleeved outside the lower roller mechanism, one end of each piezoelectric cantilever beam is fixed between the upper rigid frame and the lower rigid frame, the other end of each piezoelectric cantilever beam is arranged between the upper roller mechanism and the lower roller mechanism, and the piezoelectric cantilever beams and the electromagnetic mechanism are respectively connected with the circuit system.

2. The electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology as claimed in claim 1, further comprising a gasket, wherein the gasket is sleeved on the guide rod, and the gasket is located between the lower guide component and the elastic component.

3. An electromagnetic-piezoelectric composite vibration control device based on synchronous switch damping technology as claimed in claim 1, wherein the piezoelectric cantilever comprises a piezoelectric sheet, a flexible plate and a rigid plate, one end of the flexible plate is fixed between the upper rigid frame and the lower rigid frame, the other end of the flexible plate is fixedly connected with the rigid plate, the rigid plate is arranged between the upper roller mechanism and the lower roller mechanism, and the piezoelectric sheet is attached to the flexible plate.

4. An electromagnetic-piezoelectric composite vibration control device based on synchronous switch damping technology as claimed in claim 3, wherein said upper roller mechanism comprises an upper roller support, a plurality of upper rollers and a plurality of upper rollers, said upper roller support comprises an upper cylinder and a plurality of upper supports, said upper roller support is a one-piece structure, said upper cylinder is fixedly sleeved on said guide rod, one end of each said upper support is arranged at the lower part of said upper cylinder, another end of each said upper support is provided with one said upper roller, each said upper roller is arranged on each said upper roller, one said upper roller is in contact with the upper surface of one said rigid plate; the lower roller mechanism comprises a lower roller support, a plurality of lower wheel shafts and a plurality of lower rollers, the lower roller support comprises a lower cylinder and a plurality of lower supports, the lower roller support is of an integrated structure, the lower cylinder is fixedly sleeved on the guide rod, one end of each lower support is arranged on the upper portion of the lower cylinder, one lower wheel shaft is arranged at the other end of each lower support, one lower roller is arranged on each lower wheel shaft, and one lower roller is in contact with the lower surface of one rigid plate.

5. The electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology as claimed in claim 4, wherein the electromagnetic mechanism includes a plastic fixing bracket, a locking ring, a permanent magnet and two coils, the permanent magnet and the locking ring are sleeved on the guide rod, the locking ring, the permanent magnet and the upper roller bracket are sequentially arranged from top to bottom, the plastic fixing bracket is fixed on the upper rigid frame, the plastic fixing bracket covers the permanent magnet, and the two coils are respectively sleeved outside the plastic fixing bracket.

6. The electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology as claimed in claim 5, wherein the plastic fixing support is cylindrical, a plurality of vertical sliding grooves are circumferentially arranged on the plastic fixing support, the coil is sleeved outside the plastic fixing support, and the coil is fixed on the plastic fixing support by arranging fixing bolts in the vertical sliding grooves.

7. the electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology as claimed in claim 6, wherein a plurality of the piezoelectric sheets are connected in parallel to form a piezoelectric element, two of the coils are connected in series to form an inductive element, the circuit system includes a regulating resistor, a super capacitor, a first electronic switch, a second electronic switch and a sensing circuit, the sensing circuit is used for detecting the motion state of the system so as to change the on/off states of the first electronic switch and the second electronic switch as required, and when the sensing circuit detects that the load platform reaches a static equilibrium position, the inductive element and the super capacitor form a loop by switching the states of the first electronic switch and the second electronic switch; when the sensing circuit detects that the load platform reaches a vibration peak value, the states of the first electronic switch and the second electronic switch are switched, so that the piezoelectric element, the adjusting resistor, the inductive element and the super capacitor are sequentially connected in series to form a closed loop.

8. The electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology as claimed in claim 1, wherein the upper guide part and the lower guide part are both linear bearings.

9. The electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology as claimed in claim 1, wherein the elastic component is a return spring.

Technical Field

The invention relates to the technical field of vibration suppression, in particular to an electromagnetic-piezoelectric composite vibration control device based on a synchronous switch damping technology.

Background

The application of the piezoelectric material in vibration control mainly comprises passive control, active control and semi-active control. The passive control principle is that the positive piezoelectric effect of the piezoelectric material is utilized, and the charges generated by the piezoelectric element in the structural vibration process are dissipated or absorbed through an external series or parallel circuit, so that the system is simple, but the control effect is poor. The active control is a technology which combines modern control technology, sensing technology and the like and depends on an external power supply to implement control, and has good control effect, but the system is complex and large, the cost is high and the reliability is low. In view of the above technical drawbacks, a semi-active control technique has been developed and widely studied as a new technique.

The piezoelectric vibration semi-active control is typically a control method based on a nonlinear synchronous Switch damping technology, which is also called ssd (synchronized Switch damping) technology, and connects some simple electronic components such as inductors and switches in series in a circuit, so that electric energy on the piezoelectric component is quickly consumed or voltage inversion is realized, thereby achieving the purpose of vibration reduction. Compared with the classical semi-active vibration control method based on the nonlinear synchronous switch damping technology, the method comprises the following steps: short circuit synchronous switch damping technology (SSDS technology), inductive synchronous switch damping technology (SSDI technology), and voltage synchronous switch damping technology (SSDV technology).

Among the above methods, the SSDV technique has the most significant control effect, which theoretically can achieve complete suppression of vibration. However, this technique needs to provide an external voltage source, and the voltage amplitude needs to be proportional to the maximum amplitude of the system vibration (when no control is applied) to achieve a better control effect, and conventionally, a larger inductive element needs to be introduced to adjust the circuit to achieve a better effect, which makes the circuit system bulky and heavy, so that this method is difficult to be applied in practice.

Disclosure of Invention

In order to solve the technical problems, the invention provides an electromagnetic-piezoelectric composite vibration control device based on a synchronous switch damping technology, which has the advantages of simple structure, reliable performance, no need of an external voltage source and self-adaptive characteristic.

In order to achieve the purpose, the invention provides the following scheme:

The invention provides an electromagnetic-piezoelectric composite vibration control device based on a synchronous switch damping technology, which comprises a load platform, a guide rod, an upper rigid frame, a lower rigid frame, an upper guide part, a lower guide part, an upper roller mechanism, a lower roller mechanism, an elastic part, an electromagnetic mechanism, a circuit system and a plurality of piezoelectric cantilever beams, wherein the upper rigid frame is arranged at the upper part of the lower rigid frame, the upper guide part is arranged in the upper rigid frame, the lower guide part is arranged in the lower rigid frame, the guide rod is sleeved in the upper guide part and the lower guide part, the load platform is fixed at the upper end of the guide rod, the upper roller mechanism and the lower roller mechanism are both fixedly sleeved on the guide rod and positioned between the upper guide part and the lower guide part, the electromagnetic mechanism is fixedly sleeved outside the guide rod, the elastic component is sleeved outside the lower roller mechanism, one end of each piezoelectric cantilever beam is fixed between the upper rigid frame and the lower rigid frame, the other end of each piezoelectric cantilever beam is arranged between the upper roller mechanism and the lower roller mechanism, and the piezoelectric cantilever beams and the electromagnetic mechanism are respectively connected with the circuit system.

Preferably, the guide rod further comprises a gasket, the gasket is sleeved on the guide rod, and the gasket is located between the lower guide component and the elastic component.

Preferably, the piezoelectric cantilever beam includes a piezoelectric sheet, a flexible plate and a rigid plate, one end of the flexible plate is fixed between the upper rigid frame and the lower rigid frame, the other end of the flexible plate is fixedly connected with the rigid plate, the rigid plate is disposed between the upper roller mechanism and the lower roller mechanism, and the piezoelectric sheet is attached to the flexible plate.

Preferably, the upper roller mechanism comprises an upper roller support, a plurality of upper wheel shafts and a plurality of upper rollers, the upper roller support comprises an upper cylinder and a plurality of upper supports, the upper roller support is of an integrated structure, the upper cylinder is fixedly sleeved on the guide rod, one end of each upper support is arranged at the lower part of the upper cylinder, one upper wheel shaft is arranged at the other end of each upper support, one upper roller is arranged on each upper wheel shaft, and one upper roller is in contact with the upper surface of one rigid plate; the lower roller mechanism comprises a lower roller support, a plurality of lower wheel shafts and a plurality of lower rollers, the lower roller support comprises a lower cylinder and a plurality of lower supports, the lower roller support is of an integrated structure, the lower cylinder is fixedly sleeved on the guide rod, one end of each lower support is arranged on the upper portion of the lower cylinder, one lower wheel shaft is arranged at the other end of each lower support, one lower roller is arranged on each lower wheel shaft, and one lower roller is in contact with the lower surface of one rigid plate.

Preferably, the electromagnetic mechanism comprises a plastic fixing support, a locking ring, a permanent magnet and two coils, the permanent magnet and the locking ring are sleeved on the guide rod, the locking ring, the permanent magnet and the upper roller wheel support are sequentially arranged from top to bottom, the plastic fixing support is fixed on the upper rigid frame, the plastic fixing support covers the permanent magnet, and the two coils are respectively sleeved outside the plastic fixing support.

Preferably, the plastic fixing support is cylindrical, a plurality of vertical sliding grooves are formed in the circumferential direction of the plastic fixing support, the coil is sleeved outside the plastic fixing support, and the coil is fixed on the plastic fixing support by arranging fixing bolts in the vertical sliding grooves.

preferably, a plurality of piezoelectric sheets are connected in parallel to form a piezoelectric element, two coils are connected in series to form an inductive element, the circuit system comprises a regulating resistor, a super capacitor, a first electronic switch, a second electronic switch and a sensing circuit, the sensing circuit is used for detecting the motion state of the system so as to change the on-off state of the first electronic switch and the second electronic switch as required, and when the sensing circuit detects that the load platform reaches a static balance position, the inductive element and the super capacitor form a loop by switching the states of the first electronic switch and the second electronic switch; when the sensing circuit detects that the load platform reaches a vibration peak value, the states of the first electronic switch and the second electronic switch are switched, so that the piezoelectric element, the adjusting resistor, the inductive element and the super capacitor are sequentially connected in series to form a closed loop.

preferably, the upper guide member and the lower guide member are both linear bearings.

Preferably, the elastic member is a return spring.

Compared with the prior art, the invention has the following technical effects:

The electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology comprises an electromagnetic mechanism, a piezoelectric cantilever beam and a circuit system, and has the advantages that the circuit system is greatly simplified due to the structural advantages, the reliability of the whole system is enhanced, even if the circuit system fails, a better vibration damping effect can be realized due to the rigidity damping characteristics of the electromagnetic mechanism and the piezoelectric cantilever beam, the structure is simple, and the performance is reliable; the electromagnetic mechanism stores the electric quantity generated by electromagnetic induction in the circuit system and serves as a voltage source, and no external voltage source is needed; the induction voltage generated by the electromagnetic mechanism is approximately proportional to the maximum vibration amplitude of the system, so that the electromagnetic mechanism has the characteristic of self-adaptive voltage source.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic perspective view of an electromagnetic-piezoelectric composite vibration control device based on a synchronous switch damping technology according to the present invention;

FIG. 2 is a cross-sectional view of an electromagnetic-piezoelectric composite vibration control device based on a synchronous switch damping technology provided by the invention;

FIG. 3 is a front view of the electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology provided by the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic diagram of an electromagnetic mechanism according to the present invention;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is a schematic diagram of the movement of a permanent magnet relative to a coil in accordance with the present invention;

FIG. 8 is a graph of the induced voltage of the coil in the movement of the permanent magnet of FIG. 7;

FIG. 9 is a schematic diagram of circuitry in the present invention;

FIG. 10 is a schematic diagram of the operation of the electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology according to the present invention;

FIG. 11 is a circuit diagram of the electromagnetic charge trapping stage of the present invention;

FIG. 12 is a circuit diagram of the piezoelectric vibration control stage of the present invention;

fig. 13 is a schematic view of the passive vibration reduction principle of the electromagnetic-piezoelectric composite vibration control device (pure structure) based on the synchronous switch damping technology provided by the invention;

FIG. 14 is a schematic diagram of the electromagnetic semi-active vibration reduction principle of the electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology according to the present invention;

FIG. 15 is a schematic diagram of the electromagnetic-piezoelectric composite semi-active vibration damping principle of the electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology according to the present invention;

Fig. 16 is a graph comparing the transmittance curves for the three cases of fig. 13-15.

description of reference numerals: 1. a load platform; 2. a guide bar; 3. an upper guide member; 4. an upper rigid frame; 5. an electromagnetic mechanism; 51. a plastic fixing bracket; 52. a coil; 53. a permanent magnet; 54. locking a ring; 6. an upper roller mechanism; 61. an upper roller bracket; 7. a piezoelectric cantilever beam; 71. a flexible board; 72. a rigid plate; 73. a piezoelectric sheet; 8. a lower roller mechanism; 9. an elastic member; 10. a gasket; 11. a lower guide member; 12. a lower rigid frame; 13. circuitry; 14. a piezoelectric element; 15. an inductive element; 16. a super capacitor; 17. adjusting the resistance; 18. a sensing circuit; 19. a first electronic switch; 20. a second electronic switch.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide an electromagnetic-piezoelectric composite vibration control device based on a synchronous switch damping technology, which is simple in structure, reliable in performance, free of external voltage source and adaptive.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1-6, the present embodiment provides an electromagnetic-piezoelectric composite vibration control device based on a synchronous switch damping technology, which includes a load platform 1, a guide rod 2, an upper rigid frame 4, a lower rigid frame 12, an upper guide member 3, a lower guide member 11, an upper roller mechanism 6, a lower roller mechanism 8, an elastic member 9, an electromagnetic mechanism 5, a circuit system 13, and a plurality of piezoelectric cantilevers 7, wherein the upper rigid frame 4 is disposed on an upper portion of the lower rigid frame 12, the upper guide member 3 is mounted in the upper rigid frame 4, the lower guide member 11 is mounted in the lower rigid member, specifically, the upper guide member 3 is fixed on the upper rigid frame 4 by screws, the lower guide member 11 is fixed on the lower rigid frame 12 by screws, the guide rod 2 is sleeved in the upper guide member 3 and the lower guide member 11, the guide rod 2 is constrained by the upper guide member 3 and the lower guide member 11 to only move vertically, specifically, the upper guide part 3 and the lower guide part 11 are both linear bearings, the load platform 1 is fixed at the upper end of the guide rod 2, and specifically, the load platform 1 is in threaded connection with the guide rod 2; the upper roller mechanism 6 and the lower roller mechanism 8 are fixedly sleeved on the guide rod 2 and located between the upper guide part 3 and the lower guide part 11, specifically, the upper roller mechanism 6 and the lower roller mechanism 8 are locked on the guide rod 2 through set screws, the electromagnetic mechanism 5 is fixedly sleeved outside the guide rod 2, the elastic component 9 is sleeved outside the lower roller mechanism 8, specifically, the elastic component 9 is a reset spring, one end of each piezoelectric cantilever beam 7 is fixed between the upper rigid frame 4 and the lower rigid frame 12, the other end of each piezoelectric cantilever beam 7 is arranged between the upper roller mechanism 6 and the lower roller mechanism 8, so that the piezoelectric cantilever beams 7 are constrained on single-degree-of-freedom motion in the vertical direction, energy loss caused by flutter in other modes is reduced, and the piezoelectric cantilever beams 7 and the electromagnetic mechanism 5 are respectively connected with the circuit system 13.

The embodiment also comprises a gasket 10, the gasket 10 is sleeved on the guide rod 2, the gasket 10 is positioned between the lower guide part 11 and the elastic part 9, and the piezoelectric cantilever beam 7 can be always kept at a horizontal balance position under static balance states of different loads by adjusting the gasket 10.

As shown in fig. 4, the piezoelectric cantilever 7 includes a piezoelectric sheet 73, a flexible plate 71 and a rigid plate 72, one end of the flexible plate 71 is fixed between the upper rigid frame 4 and the lower rigid frame 12, the other end of the flexible plate 71 is fixedly connected with the rigid plate 72, the rigid plate 72 is disposed between the upper roller mechanism 6 and the lower roller mechanism 8, and the piezoelectric sheet 73 is attached to the flexible plate 71. Specifically, the upper rigid frame 4 and the lower rigid frame 12 are connected by bolts and lock the flexible plate 71 of the piezoelectric cantilever 7 therein, the rigid plate 72 of the piezoelectric cantilever 7 is connected by bolts with the flexible plate 71, the rigid plate 72 is disposed between the upper roller mechanism 6 and the lower roller mechanism 8, and the piezoelectric sheet 73 is attached to the flexible plate 71. In this embodiment, one piezoelectric cantilever 7 includes two piezoelectric patches 73, the two piezoelectric patches 73 are respectively adhered to the upper surface and the lower surface of the flexible board 71, and the piezoelectric patches 73 are disposed near the clamping end and are symmetrical along the neutral axis of the flexible board 71, and specifically, a plurality of piezoelectric patches 73 may be adhered according to requirements.

In this embodiment, four piezoelectric cantilevers 7 are arranged and uniformly distributed along the circumference of the guide rod 2, that is, the four piezoelectric cantilevers 7 are arranged two by two symmetrically.

the upper roller mechanism 6 comprises an upper roller support 61, a plurality of upper wheel shafts and a plurality of upper rollers, the upper roller support 61 comprises an upper cylinder and a plurality of upper supports, the upper roller support 61 is of an integrated structure, the upper supports, the upper wheel shafts, the upper rollers and the rigid plates 72 are in one-to-one correspondence, the upper cylinder is fixedly sleeved on the guide rod 2, specifically, the upper cylinder is axially fixed through a set screw, one end of each upper support is arranged at the lower part of the upper cylinder, one upper wheel shaft is arranged at the other end of each upper support, one upper roller is arranged on each upper wheel shaft, and one upper roller is in contact with the upper surface of one rigid plate 72; lower roller mechanism 8 includes lower roller support, a plurality of lower shaft and a plurality of lower gyro wheel, lower roller support includes drum and a plurality of lower carriage down, lower roller support formula structure as an organic whole, the lower carriage, the lower shaft, lower gyro wheel and rigid plate 72 are the one-to-one relation, the fixed cover of lower drum is located on guide arm 2, specifically, the axial fixity of drum is realized down through holding screw, the one end of each lower carriage sets up in the upper portion of drum down, a lower shaft is installed to the other end of each lower carriage, install a lower gyro wheel on each lower shaft, a lower gyro wheel contacts with the lower surface of a rigid plate 72.

as shown in fig. 5 and 6, the electromagnetic mechanism 5 includes a plastic fixing bracket 51, a locking ring 54, a permanent magnet 53 and two coils 52, the permanent magnet 53 and the locking ring 54 are sleeved on the guide rod 2, and the locking ring 54, the permanent magnet 53 and the upper roller bracket 61 are sequentially arranged from top to bottom, the permanent magnet 53 is locked on the upper roller bracket 61 by the locking ring 54, the plastic fixing bracket 51 is fixed on the upper rigid frame 4, the plastic fixing bracket 51 covers the permanent magnet 53, and the two coils 52 are respectively sleeved outside the plastic fixing bracket 51. The fixing bracket made of plastic can prevent the ferroelectric material from interfering with the magnetic field of the permanent magnet 53.

The plastic fixing support 51 is cylindrical, a plurality of vertical sliding grooves are circumferentially formed in the plastic fixing support 51, the coils 52 are sleeved outside the plastic fixing support 51, the coils 52 are fixed on the plastic fixing support 51 by arranging fixing bolts in the vertical sliding grooves, so that when the device is in static balance, the two coils 52 are symmetrically distributed along the permanent magnet 53 (as shown in fig. 5), and when the permanent magnet 53 with the distribution distance meeting the requirement of constant-speed movement is in a balance position through adjustment, the induced voltage generated by the coils 52 is maximum.

fig. 7 and 8 are schematic diagrams of the arrangement of the electromagnetic mechanism 5 and graphs of the induced voltage trend generated when the permanent magnet 53 moves from the top end of the upper coil 52 to the bottom end of the lower coil 52 at a constant speed V. The reason for this configuration is that the damping device has the largest kinetic energy, i.e., the largest velocity, at the equilibrium position during vibration, and therefore, in order to make the induced voltage generated by the coil 52 as large as possible, the permanent magnet 53 moving at a constant velocity should also generate the largest induced voltage at the equilibrium position, whereas when a single coil is used, the induced voltage generated at the equilibrium position is zero. In addition, the induced voltage generated at the equilibrium position by adopting the configuration is approximately proportional to the maximum amplitude of the system vibration, so that an adaptive voltage source can be provided for the vibration control of the piezoelectric.

As shown in fig. 9, which is a schematic diagram of a circuit system, a plurality of piezoelectric sheets 73 are connected in parallel to form a piezoelectric element 14, two coils 52 are connected in series to form an inductive element 15, the circuit system 13 includes an adjusting resistor 17, a super capacitor 16, a first electronic switch 19, a second electronic switch 20 and a sensing circuit 18, the sensing circuit 18 is used for detecting a motion state of the system so as to change the on/off states of the first electronic switch and the second electronic switch 20 as required, and when the sensing circuit 18 detects that the load platform 1 reaches a static equilibrium position, the states of the first electronic switch 19 and the second electronic switch 20 are switched so that the inductive element 15 and the super capacitor 16 form a loop; when the sensing circuit 18 detects that the load platform 1 reaches the peak of the vibration, the piezoelectric element 14, the adjusting resistor 17, the inductive element 15 and the super capacitor 16 are connected in series in sequence to form a closed loop by switching the states of the first electronic switch 19 and the second electronic switch 20.

as shown in fig. 9-12, the semi-active control process of the electromagnetic-piezoelectric composite vibration control apparatus of the present embodiment is further described with reference to schematic diagrams of the circuit system:

Initially, the system circuit is in fig. 9, with both the first electronic switch 19 and the second electronic switch 20 open. The load platform 1 in the device is forced to vibrate by external excitation and reaches a stable state. When the sensing circuit 18 detects that the load platform 1 reaches the static balance position, the first electronic switch 19 and the second electronic switch 20 in the switching circuit are in the state shown in fig. 11, at this time, only the inductive element 15 and the super capacitor 16 form a loop, the maximum electric quantity obtained by the electromagnetic mechanism 5 can be stored in the super capacitor 16, when the storage is completed, the first electronic switch 19 and the second electronic switch 20 are disconnected again to the initial state, the first-stage electromagnetic energy harvesting is completed, and the adaptive voltage source is provided for the next stage; when the sensing circuit 18 detects that the load platform 1 reaches the vibration peak (maximum and minimum), the first electronic switch 19 and the second electronic switch 20 in the switching circuit are in the state shown in fig. 12, at this time, the piezoelectric element 14, the adjusting resistor 17, the inductive element 15 and the super capacitor 16 are sequentially connected in series to form a closed loop, since the movement speed of the permanent magnet 53 of the electromagnetic mechanism 5 is zero, the induced voltage is substantially zero, at this time, the inductive element 15 can be regarded as an inductive element of the adjusting circuit, so that the problem that the circuit system 13 needs large inductance can be solved, at this time, the super capacitor 16 serves as an external power supply, the second-stage adaptive piezoelectric synchronous switch damping control is completed, and then the first electronic switch 19 and the second electronic switch 20 are cut off to complete the vibration control of one cycle. Since the moving direction of the permanent magnet 53 is different, the generated induced voltage is also different in positive and negative, and the force generated when the voltage acts on the piezoelectric element 14 can be always opposite to the vibration direction through reasonable configuration, so that the damping effect is generated.

The vibration reduction principles of passive vibration reduction, electromagnetic semi-active vibration reduction and electromagnetic-piezoelectric composite semi-active vibration reduction in this embodiment are compared as follows: .

As shown in fig. 13, passive damping of the device in this embodiment means that the circuit system 13 does not operate, and damping is achieved by a mechanical structure. The damping mechanism is equivalent to a vibration system consisting of a spring-mass-damping unit inherent to the system, and the transfer rate curve function G of the vibration system is as follows:

In the formula, x₁Is the amount of vibration displacement, x, of the load platform 1₀The excitation amplitude, C the equivalent damping of the system, K the equivalent stiffness of the system, M the mass of the load platform 1, s ═ j ω the complex variable of the laplace transform, and ω the frequency domain coefficient.

As shown in fig. 14, the electromagnetic semi-active vibration reduction of the device in this embodiment means that only the first stage of the system vibration control, i.e. electromagnetic energy capture, is implemented, which corresponds to the transfer rate curve function G corresponding to the addition of an electromagnetic damping element₀：

in the formula, x₂The vibration displacement of the load platform 1 under the electromagnetic semi-active vibration reduction of the device in the embodiment, C₀Is the equivalent damping of the system in this case, C' is the additional equivalent electromagnetic damping.

FIG. 15 is a schematic diagram of the electromagnetic-piezoelectric composite semi-active vibration reduction of the device in this embodiment, which is equivalent to that a piezoelectric damping element is added on the basis of FIG. 14, and the corresponding transfer rate curve function G of the piezoelectric damping element₁：

in the formula, x₃the vibration displacement, C, of the load platform 1 under the electromagnetic-piezoelectric composite semi-active vibration attenuation in the present embodiment is₁Is the equivalent damping of the system in this case, C "is the additional equivalent piezoelectric damping.

Fig. 16 is a graph of transmissibility for the three cases of fig. 13-15. From the solid line in the figure, it can be seen that the transmission rate curve of the system has a higher peak value at the resonance peak under the condition of passive damping. As can be seen from the dotted line in the figure, after the electromagnetic semi-active control is adopted, the resonance peak value is obviously improved due to the electromagnetic damping effect. As can be seen from the dotted line in the figure, after the electromagnetic-piezoelectric composite semi-active is adopted, the damping of the system is further enhanced due to the piezoelectric damping effect, and the resonance peak value of the system is further improved as can be seen from the transfer rate curve of the system.

In summary, the electromagnetic-piezoelectric composite vibration control device based on the synchronous switch damping technology provided by the invention comprises the electromagnetic mechanism 5, the piezoelectric cantilever beam 7 and the circuit system 13, and due to the structural advantages, the circuit system 13 is greatly simplified, the reliability of the whole system is enhanced, even if the circuit system 13 fails, a better vibration damping effect can be realized due to the rigidity damping characteristics of the electromagnetic mechanism 5 and the piezoelectric cantilever beam 7, the structure is simple, and the performance is reliable; the electromagnetic mechanism 5 stores the electric quantity generated by electromagnetic induction in the circuit system 13 and serves as a voltage source without providing an external voltage source; the induction voltage generated by the electromagnetic mechanism 5 is approximately in proportional relation with the maximum vibration amplitude of the system, so that the electromagnetic mechanism has the characteristic of self-adaptive voltage source; because the system carries out the change-over switch to implement the piezoelectric vibration control when the vibration amplitude is extremely large, the speed of the permanent magnet 53 of the electromagnetic mechanism 5 is zero at the moment, the induction voltage of the coil 52 is zero, the induction voltage can be used as an inductance element for circuit adjustment at the moment, and the circuit system 13 does not need to be additionally provided with large inductance.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.