CN113483881A - Triboelectric vibration sensor and real-time monitoring and early warning system - Google Patents
Triboelectric vibration sensor and real-time monitoring and early warning system Download PDFInfo
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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Abstract
The application discloses triboelectric vibration sensor and real-time monitoring early warning system. The triboelectric vibration sensor includes a base, a vibration assembly, and a power generation assembly. A central column is arranged in the base body; the vibration component comprises a vibrator and a first spring piece, the vibrator is in a hollow column shape and is sleeved on the periphery of the central column, and the first spring piece enables the vibrator to suspend in the base body; the power generation assembly comprises a first friction power generation unit and a second friction power generation unit, wherein the first friction power generation unit and the second friction power generation unit respectively comprise a first friction piece and a second friction piece; the first friction piece of the first friction power generation unit is arranged on the cylindrical surface of the center column, the second friction piece is arranged on the inner cylindrical surface of the vibrator, the first friction piece of the second friction power generation unit is arranged on the cylindrical surface of the center column, the second friction piece is arranged on the inner cylindrical surface of the vibrator, and the first friction piece of the first friction power generation unit and the first friction piece of the second friction power generation unit are arranged at intervals. The external vibration sensing is realized, and self-power supply can be realized.
Description
Technical Field
The application relates to the technical field of intelligent sensors, in particular to a triboelectric vibration sensor and a real-time monitoring and early warning system.
Background
Sensors, which are the most front-end key component of modern detection systems, are an integral part of many products and systems. Among the various types of sensors, vibration sensors are one of the most widely used alarm detection techniques. The system plays an important role in the fields of structural health monitoring, natural disaster early warning, vehicle theft prevention, geological exploration and the like. At present, the application working condition of the vibration sensor is mainly narrow space or remote areas, and the limitations of complex wiring, difficult battery replacement and the like exist.
Disclosure of Invention
The embodiment of the application provides a triboelectric vibration sensor and a real-time monitoring and early warning system to solve the problems that the vibration sensor is complex in wiring and difficult in battery replacement.
On one hand, the embodiment of the application provides a triboelectric vibration sensor which comprises a base body, a vibration assembly and a power generation assembly; the base body is internally provided with an accommodating space, the base body is also internally provided with a first side wall and a second side wall which are opposite to each other, the accommodating space is provided with a center post, and a first end and a second end of the center post are respectively connected with the first side wall and the second side wall; the vibration assembly comprises a vibrator and a first spring piece, the vibrator is in a hollow column shape, the vibrator is sleeved on the periphery of the central column, and the first spring piece is connected with the vibrator and the base body so as to enable the vibrator to be suspended in the accommodating space; the power generation assembly comprises a first friction power generation unit and a second friction power generation unit, the first friction power generation unit and the second friction power generation unit respectively comprise a first friction piece and a second friction piece, and the first friction piece and the second friction piece can generate electricity through friction when moving relatively; wherein: the first friction piece of the first friction power generation unit is arranged on the cylindrical surface of the central column, and the second friction piece of the first friction power generation unit is arranged on the inner cylindrical surface of the vibrator, so that the first friction piece and the second friction piece of the first friction power generation unit are oppositely arranged; the first friction piece of the second friction power generation unit is arranged on the cylindrical surface of the central column, and the second friction piece of the second friction power generation unit is arranged on the inner cylindrical surface of the vibrator, so that the first friction piece and the second friction piece of the second friction power generation unit are oppositely arranged; the first friction material of the first friction power generation unit and the first friction material of the second friction power generation unit are arranged at intervals.
According to one aspect of the embodiments of the present application, a base includes a body, a first cover disposed at a first end of the body, and a second cover disposed at a second end of the body; the first cover body and the second cover body are arranged oppositely, and the first cover body, the second cover body and the body form a closed structure with an accommodating space inside; the first end of the central column is connected with the first cover body, and the second end of the central column is connected with the second cover body.
According to one aspect of the embodiment of the present application, the first cover body has a first side wall facing the second cover body, the second cover body has a second side wall facing the first cover body, the first side wall is provided with a first limit boss, and the second side wall is provided with a second limit boss; a first limiting groove is formed in the first end of the central column, and a second limiting groove is formed in the second end of the central column; the first limiting boss and the second limiting boss are respectively clamped in the first limiting groove and the second limiting groove.
According to one aspect of the embodiment of the application, the first spring piece is annular, the inner ring of the first spring piece is connected between the first end of the center post and the first side wall of the base body, and the outer ring of the first spring piece is connected with the first end of the vibrator; the vibration assembly further comprises a second spring piece, the second spring piece is annular, an inner ring of the second spring piece is connected between the second end of the center column and the second side wall of the base body, and an outer ring of the second spring piece is connected with the second end of the vibrator.
According to an aspect of an embodiment of the present application, the first end and the second end of the vibrator face the first sidewall and the second sidewall of the base, respectively; a first end of the vibrator is provided with a first spring piece clamping groove, a second spring piece clamping groove is formed at the joint of the first side wall of the base body and the first end of the central column, an outer ring of the first spring piece is provided with an outer clamping plate, an inner ring of the first spring piece is provided with an inner clamping plate, the outer clamping plate is clamped in the first spring piece clamping groove, and the inner clamping plate is clamped in the second spring piece clamping groove; the second end of the vibrator is provided with a spring leaf limiting groove, and the outer ring of the second spring leaf is clamped in the spring leaf limiting groove.
On the other hand, the embodiment of the application provides a triboelectric vibration sensor, which comprises a base body, a vibration assembly and a power generation assembly; the base body is internally provided with an accommodating space, and the base body is internally provided with a first side wall and a second side wall which are opposite; the vibration assembly comprises a vibrator and a first spring piece, the first end of the vibrator is opposite to the first side wall, the second end of the vibrator is opposite to the second side wall, and the first spring piece is connected with the vibrator and the base body so that the vibrator is suspended in the accommodating space; the power generation assembly comprises a first friction power generation unit and a second friction power generation unit, the first friction power generation unit and the second friction power generation unit respectively comprise a first friction piece and a second friction piece, and the first friction piece and the second friction piece can generate electricity through friction when moving relatively; wherein: the first friction piece of the first friction power generation unit is arranged on the first side wall of the base body, and the second friction piece of the first friction power generation unit is arranged at the first end of the vibrator, so that the first friction piece and the second friction piece of the first friction power generation unit are oppositely arranged; the first friction piece of the second friction power generation unit is arranged on the second side wall of the base body, and the second friction piece of the second friction power generation unit is arranged at the second end of the vibrator, so that the first friction piece and the second friction piece of the second friction power generation unit are oppositely arranged.
According to one aspect of the embodiment of the application, the vibrator is columnar, the first spring piece is annular, the first spring piece is sleeved on the periphery of the vibrator, the inner ring of the first spring piece is connected with the cylindrical surface of the vibrator, and the outer ring of the first spring piece is connected with the base body.
According to one aspect of the embodiment of the present application, the material of the first friction member is a material having an electronegativity, and the material of the second friction member is a material having an electropositivity.
According to an aspect of an embodiment of the present application, each of the first friction power generating unit and the second friction power generating unit includes a conductive member, and the conductive member is stacked with the first friction member.
In another aspect, an embodiment of the present application provides a real-time monitoring and early warning system, which includes the aforementioned triboelectric vibration sensor.
The embodiment of the application provides a triboelectric vibration sensor, when the oscillator under external vibration excitation and when producing relative motion with the base member, first friction member and second friction member relative motion of first friction power generation unit, first friction member and second friction member relative motion of second friction power generation unit, because friction electrification or contact electrification principle, first friction member and second friction member can produce opposite electric charge, first friction power generation unit and second friction power generation unit can produce the alternating current signal that can reflect oscillator relative displacement change externally, realize the sensing to external vibration, and can realize self-power, the problem of vibration sensor wiring complicacy, change battery difficulty has been solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic perspective cross-sectional structural view of a triboelectric vibration sensor according to an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of a triboelectric vibration sensor according to an embodiment of the present application;
FIG. 3 is a schematic view of a partial structure of a triboelectric vibration sensor according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a first cover of a triboelectric vibration sensor according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a second cover of the triboelectric vibration sensor according to the embodiment of the present application;
FIG. 6 is a schematic structural diagram of a center post of a triboelectric vibration sensor in accordance with an embodiment of the present application;
fig. 7 is a schematic structural diagram of a vibrator of a triboelectric vibration sensor according to an embodiment of the present application at a certain viewing angle;
fig. 8 is a schematic structural diagram of a vibrator of a triboelectric vibration sensor according to an embodiment of the present application from another perspective;
FIG. 9 is a schematic structural diagram of a first leaf spring of the triboelectric vibration sensor according to the embodiment of the present application;
FIG. 10 is a schematic cross-sectional view of another embodiment of a triboelectric vibration sensor according to the present application;
fig. 11 is a signal processing flowchart of the real-time monitoring and early warning system according to the embodiment of the present application.
Reference numerals:
100-substrate, 200-vibration component, 300-power generation component;
110-a first cover, 120-a second cover, 130-a body, 140-a central column;
210-a vibrator, 220-a first spring plate, 230-a second spring plate;
310-a conductive member, 320-a first friction member, 330-a second friction member;
111-a first side wall, 112-a first limit boss, 113-a spring piece second slot;
121-a second side wall, 122-a second limit boss;
141-a first limit groove, 142-a second limit groove;
211-a spring plate first clamping groove and 212-a spring plate limiting groove;
221-inner card, 222-outer card.
Detailed Description
Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.
In the description of the present application, it is noted that, unless otherwise indicated, the terms "first" and "second," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the terms "inner," "outer," "top," "bottom," and the like, as used herein, refer to an orientation or positional relationship shown in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Referring to fig. 1 and fig. 2, an embodiment of the present application provides a triboelectric vibration sensor, which includes a substrate 100, a vibration element 200, and a power generation element 300.
The base 100 has an accommodating space therein, the base 100 further has a first sidewall 111 and a second sidewall 121 facing each other therein, the accommodating space is provided with a center post 140, a first end and a second end of the center post 140 are respectively connected to the first sidewall 111 and the second sidewall 121, the center post 140 may be located at a central position inside the base 100, the first sidewall 111 and the second sidewall 121 may be parallel to each other, and an axial direction of the center post 140 may be perpendicular to the first sidewall 111 and the second sidewall 121.
The vibration assembly 200 includes a vibrator 210 and a first spring plate 220, the vibrator 210 may be in a hollow cylindrical shape, the vibrator 210 may be sleeved on the periphery of the central column 140, and the first spring plate 220 is connected to the vibrator 210 and the base 100, so that the vibrator 210 is suspended in the accommodating space.
The power generation assembly 300 includes a first friction power generation unit and a second friction power generation unit, each of which includes a first friction member 320 and a second friction member 330, and the first friction member 320 and the second friction member 330 can be frictionally electrified when they are relatively moved.
The first friction member 320 of the first friction power generation unit may be disposed on the cylindrical surface of the central pillar 140, and the second friction member 330 of the first friction power generation unit may be disposed on the inner cylindrical surface of the vibrator 210, such that the first friction member 320 and the second friction member 330 of the first friction power generation unit are disposed opposite to each other; the first friction member 320 of the second friction power generating unit may be disposed on the cylindrical surface of the center pillar 140, and the second friction member 330 of the second friction power generating unit may be disposed on the inner cylindrical surface of the vibrator 210 such that the first friction member 320 and the second friction member 330 of the second friction power generating unit are disposed opposite to each other; also, the first friction member 320 of the first friction power generating unit and the first friction member 320 of the second friction power generating unit may be provided at an interval.
In this embodiment, when the vibrator 210 generates a relative motion with the base 100 by an external vibration excitation, the first friction member 320 and the second friction member 330 of the first friction power generation unit relatively move, the first friction member 320 and the second friction member 330 of the second friction power generation unit also relatively move, a contact area between the first friction member 320 and the second friction member 330 of the first friction power generation unit and a contact area between the first friction member 320 and the second friction member 330 of the second friction power generation unit are opposite to each other, that is, a contact area between one pair of the first friction member 320 and the second friction member 330 is larger, a contact area between the other pair of the first friction member 320 and the second friction member 330 is smaller, due to a principle of friction electrification or contact electrification, the first friction member 320 and the second friction member 330 may generate opposite charges, and the first friction power generation unit and the second friction power generation unit may externally generate an alternating current signal capable of reflecting the relative displacement change of the vibrator 210, the sensor realizes the sensing of external vibration, can realize self power supply, and avoids the problems of complex wiring, difficult battery replacement and the like caused by external power supply.
The first friction member 320 of the first friction power generation unit and the first friction member 320 of the second friction power generation unit of the present embodiment may be both in the form of a film, and may be disposed on the cylindrical surface of the central pillar 140 around the central pillar 140, specifically, may be bonded to the cylindrical surface of the central pillar 140. Similarly, the second friction member 330 of the first friction generating unit and the second friction member 330 of the second friction generating unit may be both of a film shape, and disposed on the inner cylindrical surface of the vibrator 210 around the center post 140. The second friction member 330 of the first friction power generation unit and the second friction member 330 of the second friction power generation unit may be integrally formed, or they may be provided at an interval.
In a specific implementation, referring to fig. 3, the first friction member 320 of the first friction power generation unit and the first friction member 320 of the second friction power generation unit may have the same width, for example, both have a width and are spaced apart by a distance b. When the second friction member 330 of the first friction power generating unit and the second friction member 330 of the second friction power generating unit are integrally molded, the total width of the two is c. Optionally, c > b, c ═ a, e.g. c ═ a ═ 2.5mm, b ═ 1 mm. At this time, the second friction member 330 of the first friction power generation unit and the second friction member 330 of the second friction power generation unit may be entirely corresponding to an intermediate position of the interval region between the first friction member 320 of the first friction power generation unit and the first friction member 320 of the second friction power generation unit, that is, an initial contact area between the second friction member 330 of the first friction power generation unit and the first friction member 320 may be the same as an initial contact area between the second friction member 330 of the second friction power generation unit and the first friction member 320.
In one embodiment, the first friction member 320 is made of an electropositive material, and the second friction member 330 is made of an electronegative material. For example, the material of the first friction member 320 may be copper, aluminum, gold, or the like; the second friction member 330 may be made of a polymer material having a triboelectric effect, such as nylon, polyimide (Kapton), Polytetrafluoroethylene (PTFE), or the like. Or, the first friction member 320 and the second friction member 330 are both made of a polymer material with a triboelectric effect, wherein the triboelectric sequence of the first friction member 320 is superior to that of the second friction member 330, that is, the first friction member 320 loses electrons more easily than the second friction member 330, and the larger the difference is, the better the power generation effect is.
As an alternative embodiment, each of the first and second friction power generating units may further include a conductive member 310, and the conductive member 310 may be stacked with the first friction member 320. The conductive member 310 is used for outputting electric energy, and the conductive member 310 is made of a conductive material, such as copper, aluminum, and the like. The conductive member 310 may be a film shape, and the conductive member 310 may be disposed on the cylindrical surface of the central pillar 140 to surround the central pillar 140. The conductive member 310 may have the same shape and size as the first friction member 320, and in practice, the conductive member 310 may be adhered to the cylindrical surface of the central pillar 140, and the first friction member 320 may be adhered to the conductive member 310. The first friction member 320 of the two friction power generating units may generate an alternating current signal externally by inducing with the conductive member 310.
Referring to fig. 4, 5 and 6, as an alternative embodiment, the base 100 may include a body 130, a first cover 110 and a second cover 120, wherein the first cover 110 is disposed at a first end of the body 130, and the second cover 120 is disposed at a second end of the body 130. The first cover 110 and the second cover 120 may be disposed opposite to each other, the first cover 110, the second cover 120 and the body 130 form a closed structure having an accommodating space therein, the first cover 110 may serve as a top cover of the base 100, the second cover 120 may serve as a bottom cover of the base 100, and both the first cover 110 and the second cover 120 may be fixedly connected to the base 100 by bolts. A first end of the central column 140 may be connected with the first cover 110, and a second end of the central column 140 may be connected with the second cover 120.
As an alternative embodiment, the first cover 110 has a first sidewall 111 facing the second cover 120, the first sidewall 111 may be a bottom wall of the first cover 110, the second cover 120 has a second sidewall 121 facing the first cover 110, the second sidewall 121 may be a top wall of the second cover 120, the first sidewall 111 is provided with a first limit projection 112, and the second sidewall 121 is provided with a second limit projection 122. Meanwhile, a first end of the central column 140 is provided with a first limiting groove 141, and a second end of the central column 140 is provided with a second limiting groove 142. The first limiting boss 112 and the second limiting boss 122 can be respectively clamped in the first limiting groove 141 and the second limiting groove 142, so that the central column 140 can be fixed. In particular implementation, the first limit projection 112 may be in transition fit with the first limit groove 141, and similarly, the second limit projection 122 may be in transition fit with the second limit groove 142.
As an alternative embodiment, the first spring piece 220 may have a ring shape, an inner ring of the first spring piece 220 is connected between the first end of the center post 140 and the first sidewall 111 of the base 100, specifically, the inner ring of the first spring piece 220 is fixed by being pressed between the first end of the center post 140 and the first sidewall 111 of the base 100, and an outer ring of the first spring piece 220 is connected to the first end of the vibrator 210. The vibration assembly 200 may further include a second spring plate 230, the second spring plate 230 may also be in a ring shape, an inner ring of the second spring plate 230 is connected between the second end of the central pillar 140 and the second side wall 121 of the base body 100, specifically, the inner ring of the second spring plate 230 is fixed by being pressed between the second end of the central pillar 140 and the second side wall 121, and an outer ring of the second spring plate 230 is connected to the second end of the vibrator 210. The vibrator 210 is suspended inside the base body 100 by the first spring plate 220 and the second spring plate 230, and the vibrator 210 can vibrate inside the base body 100 by an external vibration excitation. The cooperation of two spring pieces can improve the stability of the vibration monitoring performance of the sensor of this embodiment effectively.
In specific implementation, the first spring plate 220 and the second spring plate 230 may both adopt a three-rib longitudinal etching structure, and the structure is respectively connected by three reverse ribs, three forward ribs and three radial ribs from inside to outside to form a spring-mass-damping system, so that stress deformation caused by transverse vibration interference can be reduced, a wider linear frequency band is provided, nonlinear distortion is reduced, transverse impact resistance is improved, better reliability is obtained, the vibrator 210 basically only generates axial vibration, and the stability of friction power generation of the power generation assembly 300 is effectively improved. And, three consequent muscle have the inclination in the axial, make the spring leaf inner ring have difference in height in the axial with the outer loop, thus provide axial elasticity, offset the gravity of oscillator 210 in the axial, make oscillator 210 be in the critical state, can produce corresponding linear deformation when receiving the micro-amplitude vibration, oscillator 210 can vibrate. On the whole, the spring piece adopts three muscle longitudinal etching structures can improve the linearity of sensor, can realize wide band vibration monitoring, and can improve the stability of sensor vibration monitoring performance to and improve the sensitivity of sensor.
Referring to fig. 7, 8 and 9, as an alternative embodiment, the first end and the second end of the vibrator 210 face the first side wall 111 and the second side wall 121 of the base 100, respectively. A first spring piece first slot 211 is disposed at a first end of the vibrator 210, and a second spring piece slot 113 is disposed at a connection position of the first side wall 111 of the base 100 and the first end of the center post 140, where in specific implementation, the second spring piece slot 113 may be disposed on a side wall of the first limiting boss 112. An outer clamping plate 222 is arranged on the outer ring of the first spring piece 220, an inner clamping plate 221 is arranged on the inner ring of the first spring piece 220, the outer clamping plate 222 is clamped in the first clamping groove 211 of the spring piece, and the inner clamping plate 221 is clamped in the second clamping groove 113 of the spring piece. The second end of the vibrator 210 is provided with a spring plate limiting groove 212, and the outer ring of the second spring plate 230 is clamped in the spring plate limiting groove 212.
The inner clamping plate 221 of the first spring piece 220 of the embodiment is matched with the second clamping groove 113 of the spring piece to limit circumferential rotation of the first spring piece 220, the outer clamping plate 222 of the first spring piece 220 is matched with the first clamping groove 211 of the spring piece to limit circumferential rotation of the vibrator 210 and the first spring piece 220, and therefore circumferential rotation of the vibrator 210 can be limited due to arrangement of the inner clamping plate 221 and the outer clamping plate 222 of the first spring piece 220.
Referring to fig. 10, an embodiment of the present application further provides a triboelectric vibration sensor, which includes a substrate, a vibration element, and a power generation element.
The base body is internally provided with a containing space, and the base body is internally provided with a first side wall and a second side wall which are opposite.
The vibration assembly includes a vibrator 210 and a first spring plate, a first end of the vibrator 210 faces the first sidewall, a second end of the vibrator 210 faces the second sidewall, and the first spring plate is connected to the vibrator 210 and the base body such that the vibrator 210 is suspended in the accommodating space.
The power generation assembly comprises a first friction power generation unit and a second friction power generation unit, the first friction power generation unit and the second friction power generation unit respectively comprise a first friction piece 320 and a second friction piece 330, and the first friction piece 320 and the second friction piece 330 can be subjected to friction electrification when in relative motion.
Wherein, the first friction member 320 of the first friction power generation unit is arranged on the first side wall of the base body, and the second friction member 330 of the first friction power generation unit is arranged on the first end of the vibrator 210, so that the first friction member 320 and the second friction member 330 of the first friction power generation unit are oppositely arranged; the first friction member 320 of the second friction generating unit is disposed at the second side wall of the base body, and the second friction member 330 of the second friction generating unit is disposed at the second end of the vibrator 210 such that the first friction member 320 and the second friction member 330 of the second friction generating unit are disposed to face each other.
In this embodiment, when the vibrator 210 generates a relative motion with the base body by an external vibration excitation, the first friction member 320 and the second friction member 330 of the first friction power generation unit relatively move, a distance between the first friction member 320 and the second friction member 330 of the first friction power generation unit changes to generate a contact separation, the first friction member 320 and the second friction member 330 of the second friction power generation unit also relatively move, a distance between the first friction member 320 and the second friction member 330 of the first friction power generation unit changes to generate a contact separation, a distance between the first friction member 320 and the second friction member 330 of the second friction power generation unit also changes to generate a contact separation, due to a principle of friction electrification or contact electrification, the first friction member 320 and the second friction member 330 may generate an output opposite charge, the first friction power generation unit and the second friction power generation unit may generate an alternating current signal capable of reflecting the relative displacement change of the vibrator 210 at the outside, the sensing to external vibration is realized, and self-power supply can be realized.
As an alternative embodiment, the vibrator 210 may be a column, the first spring plate may be a ring, the first spring plate is sleeved on the periphery of the vibrator 210, the inner ring of the first spring plate may be connected to the cylindrical surface of the vibrator 210, and the outer ring of the first spring plate may be connected to the base, so that the vibrator 210 is suspended in the accommodating space inside the base. The vibration assembly may further include a second spring plate, and the second spring plate may be disposed in the same manner as the first spring plate. In addition, in this embodiment, the triboelectric vibration sensor may also include the central pillar 140 in the foregoing embodiment, the vibrator 210 may be in a hollow column shape, and the vibrator 210 may be sleeved on the periphery of the central pillar 140, and in this case, specific configurations of the spring piece and the base may refer to the foregoing embodiment. In addition, specific arrangement of the power generation module may also refer to the foregoing embodiments.
The embodiment of the application also provides a real-time monitoring and early warning system, which comprises the triboelectric vibration sensor according to the embodiment. With reference to fig. 11, when the sensor is excited by external vibration, a corresponding electrical signal is generated, and the signal processing may be performed by the single chip, specifically, the signal processing may include filtering, pulse frequency extraction, amplitude extraction, and the like, and the vibration frequency and the amplitude may be obtained by conversion through a linear relationship, and the vibration frequency and the amplitude may be displayed in real time by the display. Meanwhile, a plurality of vibration thresholds (frequency or amplitude) can be set according to the use condition, and when the external vibration reaches the threshold condition, the vibration grade can be prompted through the display and the alarm can be given in a grading manner.
The real-time monitoring and early warning system can realize broadband vibration real-time monitoring and grading early warning, has the advantages of wide monitoring frequency band, low error rate, high signal-to-noise ratio and the like, and has higher application value in the fields of natural disaster early warning, structural health monitoring and the like.
It should be understood by those skilled in the art that the foregoing is only illustrative of the present invention, and is not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A triboelectric vibration sensor is characterized by comprising a base body, a vibration component and a power generation component;
the base body is internally provided with an accommodating space, the base body is also internally provided with a first side wall and a second side wall which are opposite to each other, the accommodating space is provided with a center post, and a first end and a second end of the center post are respectively connected with the first side wall and the second side wall;
the vibration assembly comprises a vibrator and a first spring piece, the vibrator is in a hollow column shape, the vibrator is sleeved on the periphery of the central column, and the first spring piece is connected with the vibrator and the base body so as to enable the vibrator to be suspended in the accommodating space;
the power generation assembly comprises a first friction power generation unit and a second friction power generation unit, the first friction power generation unit and the second friction power generation unit respectively comprise a first friction piece and a second friction piece, and the first friction piece and the second friction piece can generate friction electrification when in relative motion; wherein:
the first friction piece of the first friction power generation unit is arranged on the cylindrical surface of the central column, and the second friction piece of the first friction power generation unit is arranged on the inner cylindrical surface of the vibrator, so that the first friction piece and the second friction piece of the first friction power generation unit are oppositely arranged; the first friction piece of the second friction power generation unit is arranged on the cylindrical surface of the central column, and the second friction piece of the second friction power generation unit is arranged on the inner cylindrical surface of the vibrator, so that the first friction piece and the second friction piece of the second friction power generation unit are oppositely arranged; and the first friction member of the first friction power generation unit and the first friction member of the second friction power generation unit are provided at an interval.
2. The triboelectric vibration sensor of claim 1, wherein the base includes a body, a first cover disposed at a first end of the body, and a second cover disposed at a second end of the body;
the first cover body and the second cover body are arranged oppositely, and the first cover body, the second cover body and the body form a closed structure with the accommodating space inside;
the first end of the central column is connected with the first cover body, and the second end of the central column is connected with the second cover body.
3. The triboelectric vibration sensor of claim 2, wherein the first cover has a first side wall facing the second cover, the second cover has a second side wall facing the first cover, the first side wall is provided with a first stop ledge, the second side wall is provided with a second stop ledge;
a first limiting groove is formed in the first end of the central column, and a second limiting groove is formed in the second end of the central column;
the first limiting boss and the second limiting boss are respectively clamped in the first limiting groove and the second limiting groove.
4. The triboelectric vibration sensor according to claim 1, wherein the first spring plate is ring-shaped, an inner ring of the first spring plate is connected between the first end of the center post and the first side wall of the base, and an outer ring of the first spring plate is connected with a first end of the vibrator;
the vibration assembly further comprises a second spring piece, the second spring piece is annular, an inner ring of the second spring piece is connected between the second end of the central column and the second side wall of the base body, and an outer ring of the second spring piece is connected with the second end of the vibrator.
5. The triboelectric vibration sensor according to claim 4, wherein first and second ends of the vibrator face the first and second side walls of the base, respectively;
a first end of the vibrator is provided with a first spring piece clamping groove, a second spring piece clamping groove is formed at the joint of the first side wall of the base body and the first end of the central column, an outer ring of the first spring piece is provided with an outer clamping plate, an inner ring of the first spring piece is provided with an inner clamping plate, the outer clamping plate is clamped in the first spring piece clamping groove, and the inner clamping plate is clamped in the second spring piece clamping groove;
the second end of the vibrator is provided with a spring leaf limiting groove, and the outer ring of the second spring leaf is clamped in the spring leaf limiting groove.
6. A triboelectric vibration sensor is characterized by comprising a base body, a vibration component and a power generation component;
the base body is internally provided with a containing space, and the base body is internally provided with a first side wall and a second side wall which are opposite;
the vibration assembly comprises a vibrator and a first spring piece, a first end of the vibrator is opposite to the first side wall, a second end of the vibrator is opposite to the second side wall, and the first spring piece is connected with the vibrator and the base body so that the vibrator is suspended in the accommodating space;
the power generation assembly comprises a first friction power generation unit and a second friction power generation unit, the first friction power generation unit and the second friction power generation unit respectively comprise a first friction piece and a second friction piece, and the first friction piece and the second friction piece can generate friction electrification when in relative motion; wherein:
the first friction piece of the first friction power generation unit is arranged on the first side wall of the base body, and the second friction piece of the first friction power generation unit is arranged at the first end of the vibrator, so that the first friction piece and the second friction piece of the first friction power generation unit are oppositely arranged; the first friction piece of the second friction power generation unit is arranged on the second side wall of the base body, and the second friction piece of the second friction power generation unit is arranged at the second end of the vibrator, so that the first friction piece and the second friction piece of the second friction power generation unit are oppositely arranged.
7. The triboelectric vibration sensor according to claim 6, wherein the vibrator is cylindrical, the first spring plate is annular, the first spring plate is sleeved on the periphery of the vibrator, an inner ring of the first spring plate is connected with a cylindrical surface of the vibrator, and an outer ring of the first spring plate is connected with the base.
8. The triboelectric vibration sensor according to any of claims 1 to 7, wherein the material of the first friction member is a material having an electropositive property and the material of the second friction member is a material having an electronegative property.
9. The triboelectric vibration sensor according to any of claims 1 to 8, wherein the first and second friction power generation units each comprise a conductive member, the conductive member being stacked with the first friction member.
10. A real-time monitoring and warning system comprising a triboelectric vibration sensor as claimed in any one of claims 1 to 9.
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| CN113483881B (en) | 2024-06-07 |
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