A simple vibration isolation and energy capture multifunctional structure

Abstract

The present invention discloses a simple vibration isolation and energy harvesting multifunctional structure, which is composed of one or more vibration isolation and energy harvesting mechanisms. The vibration isolation and energy harvesting mechanisms are composed of a steel frame, a piezoelectric energy harvesting module and a friction power generation energy harvesting module. The piezoelectric energy harvesting module is installed on the outside of the steel webs on both sides of the steel frame, and the two ends of the rubber suspension layer of the friction power generation energy harvesting module are installed in the grooves of the steel webs. The steel frame is composed of two parallel steel cover plates and steel webs arranged at both ends of the steel cover plates. The steel webs are arc-shaped steel plates with a groove at the center of the inner side of the steel webs. The piezoelectric energy harvesting module is composed of a first insulating layer, a piezoelectric layer and a second insulating layer bonded in sequence. The friction power generation energy harvesting module is composed of a rubber suspension layer, a nano friction power generation vibrator and a spring. The present invention overcomes the problem that the load design upper limit of existing vibration isolation and energy harvesting structures is limited by the spring, and the piezoelectric energy harvesting has no direct correlation with the displacement of the vertical spring, requiring the additional addition of a negative Poisson's ratio structure such as a slider to drive the piezoelectric piece to deform and capture energy for power generation.

Description

Technical Field

[0001] The present invention relates to the field of vibration isolation and kinetic energy conversion, and in particular to a simple vibration isolation and energy capture multifunctional structure. Background Art

[0002] With the rapid development of science and technology, the advancement of high-speed machinery, and the reduction of weight, numerous engineering vibration issues have emerged, causing deterioration in machinery performance, a decline in production efficiency, and work quality. The application of vibration isolation has gradually gained attention. Mechanical vibration is often the direct cause of severe damage and failure to machinery and structures. Using only a single vibration isolator or isolation structure design can no longer meet current energy-saving and multi-functional system output requirements.

[0003] In the existing vibration isolation and energy capture coupling structure, the system load is mainly guaranteed by the preload compression stiffness of the spring. When subjected to lateral loads, it is easy to cause eccentric wear, and the lateral vibration isolation stiffness cannot be guaranteed. The upper limit of the load design is limited by the spring, and the piezoelectric energy capture has no direct correlation with the displacement of the vertical spring. It is necessary to add additional negative Poisson's ratio structures such as sliders to drive the piezoelectric plate to deform and capture energy for power generation. Summary of the Invention

[0004] The present invention provides a simple vibration isolation and energy harvesting multifunctional structure to overcome the problems that the load design upper limit of the existing vibration isolation and energy harvesting coupling structure is limited by the spring, and the piezoelectric energy harvesting has no direct correlation with the displacement of the vertical spring, and an additional negative Poisson's ratio structure such as a slider is required to drive the piezoelectric piece to deform and capture energy for power generation.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] The present invention proposes a simple vibration isolation and energy harvesting multifunctional structure, which is composed of one or more vibration isolation and energy harvesting mechanisms. The vibration isolation and energy harvesting mechanisms are composed of a steel frame, a piezoelectric energy harvesting module and a friction power generation energy harvesting module. The piezoelectric energy harvesting module is installed on the outside of the steel webs on both sides of the steel frame, and the two ends of the rubber suspension layer of the friction power generation energy harvesting module are installed in the grooves of the steel webs; the steel frame is composed of two parallel steel cover plates and steel webs arranged at the two ends of the steel cover plates, the steel webs are arc-shaped steel plates, and a groove is provided at the center of the inner side of the steel webs; the piezoelectric energy harvesting module is composed of a first insulating layer, a piezoelectric layer and a second insulating layer bonded in sequence; the friction power generation energy harvesting module is composed of a rubber suspension layer, a nano friction power generation vibrator and a spring, the rubber suspension layer is an elastic rubber plate with multiple protrusions on the upper surface, and the spring is arranged on the protrusions; the lower end of the nano friction power generation vibrator is inserted into the spring.

[0007] Furthermore, the plurality of protrusions are arranged in a rectangular array.

[0008] Furthermore, the nano-friction power generation vibrator is a stepped cylinder made of rubber material, and the stepped cylinder includes a lower cylinder and an upper cylinder; wherein the lower cylinder is connected to the spring, and the upper cylinder is an inner cavity structure, and the upper cylinder is composed of a plastic ball made of PTFE material, a copper sheet and a rubber shell, and the upper and lower planes of the inner cavity of the rubber shell are respectively affixed with copper sheets, and there is a movable plastic ball made of PTFE material in the middle of the inner cavity.

[0009] Furthermore, the copper sheets on the upper and lower planes of the upper cylindrical inner cavity of the nano-triboelectric vibrator lead out triboelectric output leads for connecting to an external power module and a triboelectric online monitoring parameter module.

[0010] Furthermore, piezoelectric output leads are drawn between the first insulating layer, the piezoelectric layer and the second insulating layer for connecting to an external power module and a piezoelectric online parameter monitoring module.

[0011] Furthermore, the mass m of the nano-triboelectric vibrator, the stiffness k of the spring, and the external excitation frequency f satisfy the following relationship:

[0012]

[0013] The unit of m is kg and the unit of k is N / m.

[0014] The present invention has the following beneficial effects:

[0015] 1. The steel frame of the present invention has a simple and stable structure. The curved steel web serves as an elastic support and directly drives the piezoelectric piece to deform and capture energy to generate electricity through its own deformation, without the need for additional negative Poisson's ratio structures such as sliders. 2. The curved steel web is connected to an elastic rubber suspension diaphragm to form a micro-elastic foundation, thereby stimulating the frictional power generation vibrator on the rubber suspension diaphragm to capture energy. 3. In response to different load-bearing requirements, the load-bearing capacity of the structure is greatly improved by increasing the thickness of the curved steel web. At the same time, it can be combined into an array arrangement to achieve the required vibration isolation and energy capture requirements within the frequency domain, and the applicable frequency and load range are flexible and wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 This is a schematic diagram of the overall structure of a simple vibration isolation and energy capture multifunctional structure disclosed in the present invention;

[0018] Figure 2It is an isometric view of a simple vibration isolation and energy capture multifunctional structure disclosed in the present invention;

[0019] Figure 3 A schematic diagram of an application of a simple vibration isolation and energy harvesting multifunctional structure array disclosed in the present invention;

[0020] Figure 4 It is an isometric view of a steel frame structure in a simple vibration isolation and energy capture multifunctional structure disclosed in the present invention;

[0021] Figure 5 This is an isometric view of a rubber suspension layer with a spring and a nano-triboelectric generator in a simple vibration isolation and energy capture multifunctional structure disclosed in the present invention;

[0022] Figure 6 It is an isometric view of a rubber suspension layer with a protrusion in a simple vibration isolation and energy capture multifunctional structure disclosed in the present invention;

[0023] Figure 7a A detailed structural diagram of a spring in a simple vibration isolation and energy capture multifunctional structure disclosed in the present invention;

[0024] Figure 7b A detailed structural diagram of a simple vibration isolation and energy capture multifunctional nano-triboelectric generator disclosed in the present invention;

[0025] Figure 7c A detailed structural diagram of the inner cavity of a nano-friction power generation vibrator in a simple vibration isolation and energy capture multifunctional structure disclosed in the present invention;

[0026] Figure 8 This is a schematic diagram of a simulation structure of a simple vibration isolation and energy capture multifunctional structure disclosed in the present invention;

[0027] Figure 9a for Figure 8 The displacement distribution simulation results of the structure shown when subjected to a vertical force of 200N;

[0028] Figure 9b for Figure 8 The stress distribution simulation results of the structure shown when subjected to a vertical force of 200N;

[0029] Figure 10 for Figure 8 Analytical boundary diagram of the structure shown;

[0030] Figure 11a For Figure 9, the acceleration value is 10m / s when the vibration condition is 1~10000Hz 2 When , the vibration energy level difference in the frequency domain;

[0031] Figure 11b For Figure 9, the acceleration value is 10m / s when the vibration condition is 1~10000Hz 2When , the acceleration level difference in the frequency domain;

[0032] Figure 12a for Figure 8 The simulation results of vibration energy level difference for transient response analysis at an excitation frequency of 1 Hz;

[0033] Figure 12b for Figure 8 The acceleration level drop simulation results of transient response analysis at an excitation frequency of 1 Hz;

[0034] Figure 12c for Figure 8 Piezoelectric voltage simulation results for transient response analysis at an excitation frequency of 1 Hz;

[0035] Figure 12d for Figure 8 The simulation results of the PTFE plastic ball velocity at a transient response analysis with an excitation frequency of 1 Hz;

[0036] Figure 13a for Figure 8 The simulation results of vibration energy level difference for transient response analysis at an excitation frequency of 2 Hz;

[0037] Figure 13b for Figure 8 The acceleration level drop simulation results of transient response analysis at an excitation frequency of 2 Hz;

[0038] Figure 13c for Figure 8 Piezoelectric voltage simulation results for transient response analysis at an excitation frequency of 2 Hz;

[0039] Figure 13d for Figure 8 The simulation results of the PTFE plastic ball velocity at a transient response analysis with an excitation frequency of 2 Hz;

[0040] Figure 14a for Figure 8 The simulation results of vibration energy level difference of transient response analysis at 3Hz excitation frequency;

[0041] Figure 14b for Figure 8 The acceleration level drop simulation results of transient response analysis at 3 Hz excitation frequency;

[0042] Figure 14c for Figure 8 Piezoelectric voltage simulation results for transient response analysis at an excitation frequency of 3 Hz;

[0043] Figure 14d for Figure 8The simulation results of the PTFE plastic ball velocity at a transient response analysis with an excitation frequency of 3 Hz;

[0044] Figure 15a for Figure 8 The simulation results of vibration energy level difference of transient response analysis at 4 Hz excitation frequency;

[0045] Figure 15b for Figure 8 The acceleration level drop simulation results of transient response analysis at an excitation frequency of 4 Hz;

[0046] Figure 15c for Figure 8 Piezoelectric voltage simulation results for transient response analysis at an excitation frequency of 4 Hz;

[0047] Figure 15d for Figure 8 The simulation results of the PTFE plastic ball velocity at a transient response analysis with an excitation frequency of 4 Hz;

[0048] In the figure: 1. Steel frame, 11. Steel cover, 12. Steel web, 2. First insulating layer, 3. Piezoelectric layer, 4. Second insulating layer, 5. Rubber suspension layer, 51. Protrusion, 6. Nano-friction power generation vibrator, 61. Lower cylinder, 62. Upper cylinder, 621. Plastic ball, 622. Copper sheet, 623. Rubber shell, 624. Friction power generation output lead, 7. Piezoelectric output lead, 8. Spring, 91. Mechanical equipment, 92. Simple vibration isolation and energy capture multifunctional structure and its array, 93. Matrix. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] like Figures 1 to 7c As shown, a simple vibration isolation and energy harvesting multifunctional structure is composed of one or more vibration isolation and energy harvesting mechanisms, and the vibration isolation and energy harvesting mechanism is composed of a steel frame 1, a piezoelectric energy harvesting module and a friction power generation energy harvesting module. The piezoelectric energy harvesting module is attached to the outer side of the steel web 12 on both sides of the steel frame by adhesive, and the two ends of the rubber suspension layer 5 of the friction power generation energy harvesting module are installed in the groove of the steel web 12; Figure 4As shown, the steel frame 1 is composed of two parallel steel cover plates 11 with a width of 60 mm and a steel web 12 with a width of 60 mm and a thickness of 1 mm arranged at both ends of the steel cover plates. The steel web 12 is an arc-shaped steel plate, and a groove is provided at the center of the inner side of the steel web 12; the piezoelectric energy capture module is composed of a first insulating layer 2, a piezoelectric layer 3 and a second insulating layer 4 bonded in sequence, the piezoelectric layer adopts a PZT material with a thickness of 1 mm, and the first insulating layer and the second insulating layer both adopt a rubber plate with a thickness of 0.5 mm; the friction power generation energy capture module is composed of a rubber suspension layer 5, a nano friction power generation vibrator 6 and a spring 8, the rubber suspension layer 5 is a rubber plate with a hardness of 60HA, and a plurality of protrusions 51 are provided on the upper surface; the spring 8 is provided on the protrusion 51, and the lower end of the nano friction power generation vibrator 6 is inserted into the spring 8.

[0051] Based on the above, it can be seen that this application does not require the addition of negative Poisson's ratio structures such as sliders to drive the deformation of the piezoelectric piece to capture energy and generate electricity. The curved steel web of the steel frame can bend and deform to form an elastic support when it is subjected to force at both ends. According to the negative Poisson's ratio effect, the vertical displacement of the steel frame structure during excitation is converted into the lateral displacement of the curved steel web. The piezoelectric layer attached to the outside of the curved steel web converts the vibration energy into electrical energy. The curved steel web of the steel frame is connected to the elastic rubber suspension layer to form a micro-elastic foundation. The springs and nano-friction power generation vibrators arranged on the rubber suspension layer further convert the vibration energy into electrical energy. When the friction nano-power generation vibrator resonates under excitation, the nano-friction power generation will surge, and the load design upper limit does not need to be limited by the spring.

[0052] In a specific embodiment, the steel web 12 is a steel plate whose arc edge satisfies the sine line sin(π*h), where h is the vertical inner distance between the upper and lower steel cover plates of the steel frame, and the vertical inner distance between the upper and lower steel cover plates of the steel frame is 50 mm.

[0053] In a specific embodiment, the length of the groove is the same as the width of the steel web 12 , and the depth of the groove is 1 / 5 of the thickness of the steel web 12 .

[0054] In a specific embodiment, the plurality of protrusions 51 are arranged in a 3*7 rectangular array, with a protrusion height of 2 mm and a protrusion diameter of 2 mm.

[0055] In a specific embodiment, the nano-friction power generation vibrator 6 is a stepped cylinder made of rubber material, and the stepped cylinder includes a lower cylinder 61 and an upper cylinder 62. The lower cylinder has a height of 2 mm and a diameter of 2 mm, and the upper cylinder has a height of 3 mm and a diameter of 4 mm; wherein the lower cylinder 61 is connected to the spring 8, and the upper cylinder 61 is an inner cavity structure with an inner cavity diameter of 3 mm and a height of 3 mm. The upper cylinder 61 is composed of a plastic ball 621 made of PTFE material, a copper sheet 622 and a rubber shell 623. The upper and lower planes of the inner cavity of the rubber shell 623 are respectively glued with a copper sheet 622 with a thickness of 0.1 mm. A movable plastic ball 621 made of PTFE with a diameter of 2 mm is arranged in the middle of the inner cavity. The friction coefficient of PTFE material is small, which can reduce the energy loss during friction with the copper sheet.

[0056] In a specific embodiment, Figure 7c As shown, the copper sheets 622 on the upper and lower planes of the inner cavity of the upper cylinder 62 of the nano-triboelectric vibrator 6 lead out triboelectric output leads 624 for connecting to an external power module and a triboelectric online monitoring parameter module.

[0057] In a specific embodiment, Figure 1 As shown, a piezoelectric output lead 7 is led out between the first insulating layer 2, the piezoelectric layer 3 and the second insulating layer 4, and is used for external connection to an electric energy module and a piezoelectric online parameter monitoring module.

[0058] In a specific embodiment, the mass m of the nano-triboelectric vibrator 6, the stiffness k of the spring 8, and the external excitation frequency f satisfy the following relationship:

[0059]

[0060] The unit of m is kg and the unit of k is N / m.

[0061] On the one hand, the piezoelectric output lead 7 and the friction power generation output lead 624 can be connected to an external power module to collect the electric energy converted from vibration. On the other hand, since the energy capture quantity of the present invention has a significant regularity with the excitation, the quantity can be used as an identification signal of the external load. By connecting the piezoelectric output lead 7 and the friction power generation output lead 624 to the external online monitoring parameter module, the data can be collected and summarized for analysis, realizing online monitoring of the vibration response parameters, and providing convenience for subsequent research work.

[0062] In a specific embodiment, Figure 3 As shown, the simple vibration isolation and energy harvesting multifunctional structure and its array 92 can disperse the vibration of the mechanical equipment 91 on a fixed base 93. By adjusting the thickness of the steel web and the number of vibration isolation and energy harvesting structures, the present invention can be used for engineering equipment and structures of different specifications, especially for large engineering equipment used in the shipbuilding field.

[0063] In order to better illustrate the invented simple vibration isolation and energy capture structure, an ideal model is established, such as Figure 8 As shown in the figure, the thickness of the curved steel web of the steel frame is 1 mm, the rubber suspension layer is made of a rubber plate with a thickness of 2 mm and a hardness of 60HA, the spring nano-friction power generation vibrator is simulated by a cylindrical rubber shell, the inner cavity of the rubber shell is provided with a movable PTFE plastic ball with a diameter of 2 mm, and a 1 mm thick piezoelectric layer of PZT-5A material is attached to both sides of the outer side of the steel frame.

[0064] Fixed as Figure 8 The displacement of the bottom edge of the steel frame is shown in the figure. A vertical downward force of 200N is applied to the upper surface of the steel frame. The analysis results are as follows: Figure 9a 、 Figure 9b As shown, the maximum displacement is 0.10 mm and the maximum stress is less than 1.40×10 8 Pa.

[0065] During vertical excitation, the vibration conditions imposed on the upper surface are 1 to 10,000 Hz and the acceleration value is 10 m / s. 2 , respectively extract the responses of the upper and lower contact surfaces of the steel frame and the upper and lower steel covers and the arc steel plates, such as Figure 10 As shown, they are response surface A, response surface B and the vibration responses of point a (center point of the upper layer of the steel frame) and point b (center point of the lower layer of the steel frame).

[0066] In order to facilitate the calculation and analysis of the vibration isolation effect, the acceleration a of the vibration response point a is analyzed. a , the acceleration a at point b b , input excitation energy J A , the excitation energy J output by the simple vibration isolation and energy capture multifunctional structure B .

[0067] The vibration isolation effect parameters are defined as follows:

[0068] Vibration energy level difference

[0069] Acceleration level difference

[0070]

[0071] When evaluating the vibration isolation effect of a vibration isolation device, the vibration level difference is usually used for evaluation. The vibration level difference is calculated using acceleration and expressed in decibels. Generally speaking, the greater the vibration level difference, the better the vibration isolation effect of the vibration isolation device. Therefore, Figure 11a The vibration energy level difference shown is as follows: Figure 11b The acceleration level difference shown shows that this case has excellent vibration isolation effect.

[0072] The transient response analysis was performed with excitation frequencies of 1Hz, 2Hz, 3Hz and 4Hz respectively.

[0073] At this time, the vertical excitation force F applied to the top surface of the steel sheet on the vibration isolation and noise reduction thin layer is (t is time):

[0074] At 1Hz: F = -10*sin(2*π*t)N

[0075] At 2Hz: F = -10*sin(4*π*t)N

[0076] At 3Hz: F = -10*sin(6*π*t)N

[0077] At 4Hz: F = -10*sin(8*π*t)N

[0078] Extract the vibration response, piezoelectric output voltage and PTFE plastic ball velocity during the stable operation cycle, such as Figures 12a to 15d As shown, it can be seen from the data results that the vibration energy level difference can reach -170dB level; the acceleration level difference is at 155dB level; the piezoelectric voltage is linearly related to the excitation frequency and presents a half-wave waveform; and the speed of the PTFE plastic ball that reflects friction power generation is as high as 20mm / s to 60mm / s. During the vibration isolation process, the lower the negative value of the vibration energy level difference, the higher the positive value of the acceleration level difference, and the better the vibration isolation effect. The larger the piezoelectric voltage amplitude, the greater the energy captured; the greater the speed of the PTFE plastic ball, the more intense the collision and friction between the PTFE plastic ball and the copper sheet, and the more charge is generated. The piezoelectric voltage and charge of the present invention can obviously reflect the degree of external excitation. Therefore, the present invention has superior vibration isolation performance, energy capture capability and electrical parameter output rules for vibration state perception.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A simple vibration isolation and energy capture multifunctional structure, characterized in that: The simple vibration isolation and energy capture multifunctional structure is composed of one or more vibration isolation and energy capture mechanisms, wherein the vibration isolation and energy capture mechanisms are composed of a steel frame (1), a piezoelectric energy capture module and a friction power generation energy capture module, wherein the piezoelectric energy capture module is installed on the outside of the steel webs (12) on both sides of the steel frame, and the two ends of the rubber suspension layer (5) of the friction power generation energy capture module are installed in the grooves of the steel webs (12); The steel frame (1) is composed of two parallel steel cover plates (11) and steel web plates (12) arranged at opposite ends of the steel cover plates. The steel web plates (12) are arc-shaped steel plates, and a groove is provided at the center of the inner side of the steel web plates (12). The piezoelectric energy-harvesting module is composed of a first insulating layer (2), a piezoelectric layer (3), and a second insulating layer (4) laminated in sequence; The triboelectric energy capture module is composed of a rubber suspension layer (5), a nano-triboelectric vibrator (6) and a spring (8); the rubber suspension layer (5) is an elastic rubber plate with a plurality of protrusions (51) provided on its upper surface; The spring (8) is arranged on the protrusion (51), and the lower end of the nano-friction power generation vibrator (6) is inserted into the spring (8).

2. The simple vibration isolation and energy capture multifunctional structure according to claim 1 is characterized in that: The plurality of protrusions (51) are arranged in a rectangular array.

3. The simple vibration isolation and energy capture multifunctional structure according to claim 1 is characterized in that: The nano-friction power generation vibrator (6) is a stepped cylinder made of rubber material, and the stepped cylinder includes a lower cylinder (61) and an upper cylinder (62); wherein the lower cylinder (61) is connected to the spring (8), and the upper cylinder (62) has an inner cavity structure, and the upper cylinder is composed of a plastic ball (621) made of polytetrafluoroethylene (PTFE), a copper sheet (622) and a rubber shell (623); the upper and lower planes of the inner cavity of the rubber shell (623) are respectively affixed with the copper sheet (622), and a movable plastic ball (621) made of PTFE is arranged in the middle of the inner cavity.

4. The simple vibration isolation and energy capture multifunctional structure according to claim 3 is characterized in that: The copper sheets (622) on the upper and lower planes of the inner cavity of the upper cylinder (62) of the nano-triboelectric vibrator (6) lead out triboelectric output leads (624) for connecting to an external power module and a triboelectric online monitoring parameter module.

5. The simple vibration isolation and energy capture multifunctional structure according to claim 1 is characterized in that: A piezoelectric output lead (7) is drawn out between the first insulating layer (2), the piezoelectric layer (3) and the second insulating layer (4) and is used for connecting to an external power module and a piezoelectric online parameter monitoring module.

6. The simple vibration isolation and energy capture multifunctional structure according to claim 1 is characterized in that: The mass m of the nano-friction power generation vibrator (6), the stiffness k of the spring (8), and the external excitation frequency f satisfy the following relationship: The unit of m is kg and the unit of k is N / m.

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