CN112067094B - Friction nanometer generator self-driven mass sensor based on one-dimensional under-damped motion mode - Google Patents

Friction nanometer generator self-driven mass sensor based on one-dimensional under-damped motion mode Download PDF

Info

Publication number
CN112067094B
CN112067094B CN202010938973.5A CN202010938973A CN112067094B CN 112067094 B CN112067094 B CN 112067094B CN 202010938973 A CN202010938973 A CN 202010938973A CN 112067094 B CN112067094 B CN 112067094B
Authority
CN
China
Prior art keywords
friction material
friction
self
bottom plate
mass sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010938973.5A
Other languages
Chinese (zh)
Other versions
CN112067094A (en
Inventor
王雪
伍燕
曾启煊
胡陈果
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing University
Original Assignee
Chongqing University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing University filed Critical Chongqing University
Priority to CN202010938973.5A priority Critical patent/CN112067094B/en
Publication of CN112067094A publication Critical patent/CN112067094A/en
Application granted granted Critical
Publication of CN112067094B publication Critical patent/CN112067094B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups
    • G01G7/06—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups by electrostatic action
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/34—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring roughness or irregularity of surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L21/00—Vacuum gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/60—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrostatic variables, e.g. electrographic flaw testing

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Electromagnetism (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

The invention discloses a self-driven mass sensor of a friction nano generator based on a one-dimensional under-damped motion mode, which comprises a bottom plate, a round pipe is arranged above the bottom plate, two ends of the round pipe are respectively fixedly arranged through two supporting plates positioned on the bottom plate, a weighing groove is movably sleeved on the circular tube, a spring is arranged between the weighing groove and one of the supporting plates, the spring is sleeved outside the circular tube, a friction material layer A is arranged outside the bottom of the weighing groove, a friction material layer B is laid on the bottom plate along the extending direction of the circular tube, a pair of conductive electrodes with the same specification are attached to the lower side of the friction material B layer along the telescopic motion track of the weighing groove, a gap is formed between the pair of conductive electrodes, the friction material A layer can be in contact with the friction material B layer, and the friction material A and the friction material B are two materials with different electronegativities. The invention can be used in various environments, and has the advantages of convenient use, simple structure, low cost and high precision.

Description

Friction nanometer generator self-driven mass sensor based on one-dimensional under-damped motion mode
Technical Field
The invention relates to a mass sensor, in particular to a self-driven mass sensor of a friction nano generator based on a one-dimensional under-damped motion mode.
Background
The rapid development of the internet of things promotes the development of modern industry and information society, and in order to improve the production efficiency and the safety, various sensors are developed and distributed in all corners of the world, so that the aspects of the life of people are deeply influenced. At present, most of sensor equipment needs an external power supply, and the circuit connection is complex and complex, and potential safety hazards exist. In addition, for battery powered sensors, batteries need to be replaced periodically to ensure proper operation, and therefore, a large number of used batteries, if not properly disposed of, can cause serious environmental pollution.
In 2006, the Wangzhining academy first proposed a self-driven concept, and then self-driven sensing systems developed rapidly. Self-driven sensors can draw energy from the external environment without an external power source and thus operate actively and independently, which is considered to be the most promising approach to solve power problems in large-scale sensor networks. In 2012, the concept of a triboelectric nano-generator (TENG) was first proposed by wangzhining academy and his team at the georgia institute. TENG has the following advantages over previous energy conversion technologies: low cost, wide material selection, high output performance and the like. TENG can of course be used as a self-powered sensor, so that a self-driven sensing system can be built without an external power source. In recent years, a large number of TENG-based self-driven sensors have been successfully designed and applied, such as vibration sensors, acceleration sensors, displacement sensors, and the like. Therefore, the development of a new electronic product based on TENG can lead to many valuable applications on the one hand and alleviate problems of energy shortage and environmental pollution on the other hand.
However, the external environment (such as temperature and humidity) has a great influence on the TENG output performance, so that the self-driven sensor designed depending on the TENG electrical output amplitude has extremely high environmental requirements if high sensitivity is to be maintained, and the application range of the self-driven sensor is limited. Therefore, designing a self-driven sensor with high precision and wide application range is still a problem to be solved.
As is known, mass measuring balances commonly used in laboratories have high precision, but have many limitations in use, such as the need for precise adjustment and correction to ensure the measuring precision, and the possibility of measuring errors and instrument damage due to slight improper operation. Moreover, similar to common mass measuring tools (such as electronic scales, spring scales, weighing scales, etc.), the principle of which is based on hooke's law or the principle of lever balance of force, cannot be used in a completely weightless environment (such as space).
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a self-driven mass sensor of a friction nano generator based on a one-dimensional under-damped motion mode, which is used in various environments, and has the advantages of convenience in use, simple structure, low cost and high precision.
In order to achieve the purpose, the technical scheme of the invention is as follows: a friction nanometer generator self-driven mass sensor based on a one-dimensional under-damped motion mode is characterized in that: including the bottom plate the top of bottom plate is provided with the pipe, the both ends of pipe are respectively through two backup pad fixed mounting that are located the bottom plate, the loop has the weighing groove on the pipe, be provided with the spring between weighing groove and one of them backup pad, this spring housing is outside the pipe, the tank bottom outside in weighing groove is provided with friction material A layer, friction material B layer has been laid along pipe extending direction on the bottom plate, the downside on friction material B layer has pasted the conductive electrode that a pair of specification is identical along weighing groove concertina movement orbit, has the gap between this pair of conductive electrode, and during spring initial state, and this gap is located the central point in weighing groove and puts, friction material A layer can contact with friction material B layer, friction material A and friction material B are two kinds of materials of electronegativity difference.
In the scheme, the method comprises the following steps: the friction material A and the friction material B are respectively selected from one of polytetrafluoroethylene, acrylic plates, polyimide, polyethylene terephthalate, perfluoroethylene propylene copolymer, aluminum, copper, silver, polypropylene, polystyrene and nylon.
In the above aspect, it is preferable that: the friction material A is polytetrafluoroethylene, and the friction material B is acrylic.
In the scheme, the method comprises the following steps: the bottom plate and the two supporting plates are enclosed to form a U-shaped frame.
In the scheme, the method comprises the following steps: the U-shaped frame and the round tube are both made of plastic or glass.
In the scheme, the method comprises the following steps: the weighing groove is a square groove, the two ends of the weighing groove are provided with vertical connecting support lugs, and the square groove is movably sleeved on the circular tube through a through hole in the vertical connecting support lug.
In the scheme, the method comprises the following steps: the conductive electrode is an aluminum electrode.
Has the advantages that: the invention designs M-TENG according to a kinematics rule. Because the one-dimensional under-damped vibration is quasi-periodic vibration, the quasi-period and the frequency of the vibration are only related to the inherent characteristics (such as mass and spring stiffness coefficient) of the system, the M-TENG designed by the invention not only has high precision, but also is not limited by the leveling of an instrument and the working environment, and has wide application range. Furthermore, in addition to measuring mass, M-TENG is also expected to enable detection of the uniformity of the solid surface as well as the system gas concentration or ambient vacuum. The sensor is convenient to use, simple in structure and low in cost, and provides a new idea for a high-precision self-driven multifunctional sensing system.
Drawings
FIG. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of the operation of the system.
The M-TENG transferred charge changes with time after the oscillator of FIG. 3 is released from 4cm from the origin.
FIG. 4 is a graph of M-TENG current as a function of time after the transducer has been released from 4cm from the origin.
Fig. 5 is a comparison of the actual transferred charge amount curve and the theoretical curve.
Fig. 6 compares the actually measured current curve with the theoretical curve.
FIG. 7 current output curves for M-TENG release at (a)3cm, (b)4cm, (c)5cm from the origin, respectively, of the vibrator.
FIG. 8 shows the output curves of M-TENG for the amount of transferred charge released by the transducer at distances of (d)3cm, (e)4cm and (f)5cm from the origin, respectively.
FIG. 9 shows quasiperiods corresponding to release of the vibrator at distances of 3cm, 4cm and 5cm from the origin, respectively.
Fig. 10 is a graph showing the current output when a4 paper was used as the bottom friction layer (friction material B layer).
Fig. 11 shows the current output curve when the acrylic square plate is used as the bottom friction layer (friction material B layer).
FIG. 12 illustrates the quasiperiods associated with M-TENG operation at different tilt angles.
FIG. 13 oscillator mass versus quasiperiod.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
all vibrations in real life all belong to damping vibration, and when vibration system received external resistance effect, if no external energy supplyes, vibration amplitude will constantly reduce until being in quiescent condition. The present invention is primarily concerned with damping vibrations in three situations. The damping vibration (air damping vibration) is considered only by air resistance, the damping vibration (friction damping vibration) is considered only by friction, and the damping vibration (air damping vibration including friction) is considered by air resistance and friction force.
1 air damping vibration
When the speed of motion of an object is small, it can be considered that the air resistance is proportional to the particle velocity. During the experiment, one end of the spring is fixed, the other end of the spring is connected with the vibrator, the vibrator is placed on the bottom plate, the air resistance coefficient gamma and the stiffness coefficient k of the light spring are achieved, and the mass of the vibrator is m. And establishing a coordinate system by taking the position of the vibrator as an original point when the spring is in the original length. And placing the vibrator at x0Is released (x)0>0 and stretched within the elastic limits of the spring), i.e., the spring is stretched and then released. According to newton's second law, the motion equation of the vibrator is as follows:
Figure BDA0002672597000000041
x represents the distance of movement.
Dividing both sides of the equation by m to obtain
Figure BDA0002672597000000051
Wherein
Figure BDA0002672597000000052
Characteristic equation of equation (1.2)
Figure BDA0002672597000000053
Get it solved
Figure BDA0002672597000000054
Order to
Figure BDA0002672597000000055
The formula of equation (1.1) is solved as
Figure BDA0002672597000000056
The quasi-period of the damping vibration
Figure BDA0002672597000000057
Corresponding logarithmic reduction
Figure BDA0002672597000000058
In summary, air damped vibration has the following characteristics: the quasiperiodic and logarithmic reductions are related only to the system characteristics, and if the system characteristics remain unchanged, the quasiperiodic and logarithmic reductions are constant.
2 frictional damping of vibrations
The friction discussed in this section is independent of the relative speed of the object, the roughness of the substrate material is consistent (friction is constant), and the effect of air resistance is not considered. Assuming that the friction coefficient of the vibrator and the plane is mu, when v ═ dx/dt < 0, the motion equation is as follows:
Figure BDA0002672597000000061
both sides of the equation are divided by m at the same time to obtain
Figure BDA0002672597000000062
Wherein
Figure BDA0002672597000000063
Characteristic equation of equation (3.9)
Figure BDA0002672597000000064
Get it solved
λ＝±ω0i (1.11)
The general solution of equation (3.8) is
Figure BDA0002672597000000065
Figure BDA0002672597000000066
Wherein
Figure BDA0002672597000000067
When bringing the initial condition t to 0, x to x0And v ═ dx/dt ═ 0, to give A1＝(x0-c)，
Figure BDA0002672597000000068
x＝(x0-c)cos ω0 t+c (1.12)
v＝-(x0-c)ω0 sin ω0 t (1.13)
When in use
Figure BDA0002672597000000071
ω0And (d) substituting t ═ pi into the formula, and obtaining:
x1＝2c-x0，v＝0 (1.14)
when v ═ dx/dt > 0, the oscillator is at x1When sliding in the forward direction, the motion equation is as follows:
Figure BDA0002672597000000072
its general solution is
Figure BDA0002672597000000073
Figure BDA0002672597000000074
Substituting the initial condition (3.14) into the equations (3.15) and (3.16) to obtain
Figure BDA0002672597000000075
A2＝x0-3c
x＝(x0-3c)cos ω0 t-c (1.17)
v＝-(x0-3c)ω0 sin ω0 t (1.18)
When T is T, ω0t is 2 pi, substituting into (3.17), to obtain
x2＝x0-4c，v＝C (1.19)
By analogy, the general solution of the friction damping motion is
x＝An cos ω0 t+(-1)n+1c (1.20)
v＝-An ω0 sin ω0 t
Wherein A isn＝x0- (2n-1) c, n ═ 1, 2, 3, …, 2n-1, (n is the 1 st, 2, 3. The corresponding logarithmic reductions are as follows:
Figure BDA0002672597000000076
in summary, if the time spent by two adjacent maximum displacements is taken as the quasiperiodic, the friction damping vibration is still quasiperiodic, but the logarithmic reduction is gradually increased with the passage of time.
Air damping vibration containing friction
The motion laws of the air damping vibration and the friction damping vibration are derived in detail above, and it is obtained that the damping vibration under the two conditions is quasi-periodic vibration, and the air damping vibration containing friction is discussed in this section. First, when v ═ dx/dt < 0, the equation of motion is as follows:
Figure BDA0002672597000000081
removing each item by m times
Figure BDA0002672597000000082
Wherein, delta is gamma/2 m, c is mu mg/k,
Figure BDA0002672597000000083
the characteristic equation is the same as the formula (1.3), and the general solution is as follows:
Figure BDA0002672597000000084
Figure BDA0002672597000000085
bringing into initial conditions t ═ 0, x ═ x0V ═ 0, solved to:
Figure BDA0002672597000000086
Figure BDA0002672597000000087
Figure BDA0002672597000000088
when in use
Figure BDA0002672597000000089
wt＝π，
Figure BDA00026725970000000810
The above formula is substituted to obtain:
Figure BDA00026725970000000811
when v is>0, i.e. the oscillator is formed by x1Square motion, then the kinetic equation:
Figure BDA0002672597000000091
it is used for relieving
Figure BDA0002672597000000092
Figure BDA0002672597000000093
Substituting the initial condition (3.29) into the above formula, and resolving to obtain
Figure BDA0002672597000000094
Can push in the same way
Figure BDA0002672597000000095
By analogy, the air damping vibration equation containing friction force:
Figure BDA0002672597000000096
Figure BDA0002672597000000097
wherein
Figure BDA0002672597000000098
In summary, the air damping vibration including the friction force is still quasi-periodic vibration, but unlike the air damping vibration, the amplitude reduction rate is varied and irregular.
Example 1
The invention designs M-TENG according to a kinematics rule. Because the one-dimensional under-damped vibration is quasi-periodic vibration, the quasi-period and the frequency of the vibration are only related to the inherent characteristics (such as mass and spring stiffness coefficient) of the system, the M-TENG designed by the invention not only has high precision, but also is not limited by the leveling of an instrument and the working environment, and has wide application range.
The self-driven mass sensor of the friction nano generator based on the one-dimensional under-damped motion mode comprises a bottom plate 1, a supporting plate 2, a circular tube 3, a spring 4, a weighing groove 5, a vertical connecting support lug 6, a friction material layer A7, a friction material layer B8 and a conductive electrode 9.
In the figure, a U-shaped frame is formed by enclosing a bottom plate 1 and two supporting plates 2, and during manufacturing, a larger bottom plate can be adopted, and the two supporting plates 2 are arranged on the bottom plate and used for supporting a circular tube 3. Two ends of the round pipe 3 are fixed on the two supporting plates 2, and the round pipe 3 is positioned above the bottom plate 1. The U-shaped frame and the round tube 3 are both made of plastic or glass. The acrylic used in this experiment. Of course, any other material that can be shaped by hard material may be used.
The loop has weighing groove 5 on pipe 3, and weighing groove 5 is used for placing and treats the weighing article, and weighing groove 5 is square groove in the picture, and its both ends are provided with vertical connection journal stirrup 6, and this square groove passes through the through-hole loop on vertical connection journal stirrup 6 and is on pipe 3. A spring 4 is arranged between the weighing groove 5 and one of the supporting plates 2, namely, one end of the spring 4 is connected to the supporting plate 2, the other end of the spring 4 is connected to a side plate of the weighing groove 5, the spring 4 is sleeved outside the circular tube 3, in the experiment, the diameter of the circular tube 3 is 10mm, the diameter of the spring 4 is 12mm (the length is 10cm, the wire diameter is 0.4mm, the outside of the bottom of the weighing groove 5 is provided with a friction material layer A7, a friction material layer B8 is laid on the bottom plate 1 along the extending direction of the circular tube 3, the lower side of the friction material layer B8 is pasted with a pair of conductive electrodes 9 with the same specification along the extending and retracting motion track of the weighing groove 5, namely, the pair of conductive electrodes 9 are distributed from left to right in the figure, a gap is arranged between the pair of conductive electrodes 9, and the gap is positioned at the center position of the weighing groove 5 in the initial state of the spring 4, namely, the gap is on the same straight line with the central line extending front and back of the weighing groove 5 in the figure, the conductive electrode 9 is an aluminum electrode. The friction material a layer 7 can be in contact with the friction material B layer 8, and the friction material a and the friction material B are two materials with different electronegativities, i.e. they have different electron gaining and losing abilities. For example, the friction material a and the friction material B are respectively selected from one of polytetrafluoroethylene, acrylic plate, polyimide, polyethylene terephthalate, perfluoroethylene propylene copolymer, aluminum, copper, silver, polypropylene, polystyrene and nylon. In the experiment, the friction material A is made of polytetrafluoroethylene, and the friction material B is made of acrylic.
Fig. 2(b-d) illustrate the working principle of the system. Establishing a coordinate system by taking the position of the gravity center of the vibrator (weighing slot) as an origin when the spring is in the original length as well as stretching the vibrator to x from the origin0Is (x)0>0, v ═ 0, and stretched within the elastic limit of the spring), as shown in fig. 2(b), since PTFE is more negative than acrylic, through the contact friction between the two surfaces, the lower surface of PTFE is charged with negative charges, while the upper surface of acrylic is charged with positive charges of the same amount, the right electrode is charged with positive charges, and the left electrode is charged with negative charges. At this time, the system is in an electrostatic equilibrium state, and there is no current signal in the external circuit. Sliding to the left (v) due to spring force when the vibrator is released<0) As shown in fig. 2(c), the electrostatic balance of the whole system is broken, the left electrode gradually induces positive charges, and a current flows from the right electrode to the left electrode in an external circuit. The force being dissipated by both friction and air resistanceAction, movement of vibrator to negative maximum displacement-x1Is (x)1<x0) The rear speed becomes 0 as shown in fig. 2(d), at which time the system reaches the electrostatic equilibrium state again and there is no current signal in the external circuit. Similarly, when the vibrator slides to the right under the spring force, there is a current flowing from the left electrode to the right electrode in the external circuit. When the vibrator does damping vibration under the action of spring force, air resistance and friction force, the external circuit generates alternating current output until the vibrator is in a static state.
The voltage, current, and amount of transferred charge of the external circuit are closely related to the motion state of the vibrator, as shown in fig. 3-6. When the vibrator is released from a position 4cm away from the original point, the vibrator undergoes 3.5 quasi-periods under the action of spring force, friction force and air resistance and finally stands at the position of an equilibrium point, and a transferred charge quantity output curve and a current output curve of the vibrator are shown in the figure. In order to find the relationship between the transferred charge amount and the current output curve and the oscillator motion, the output of M-TENG was theoretically analyzed. According to the current formula:
Figure BDA0002672597000000111
substituting formula (1.35) into formula (1.37) to obtain:
Figure BDA0002672597000000121
wherein σ is the surface charge density of PTFE (polytetrafluoroethylene), l is the width of PTFE, and can be obtained according to a charge quantity calculation formula:
Figure BDA0002672597000000122
wherein
Figure BDA0002672597000000123
Quasi period
Figure BDA0002672597000000124
From the expressions (1.38) and (1.39), the transferred charge quantity and current output curve of the M-TEMG is still a quasi-period damped oscillation curve, and the quasi-period of the M-TEMG is shown in the expression (1.41). The quasiperiod is related to the properties of the system (where quasiperiod is related to spring stiffness coefficient, vibrator mass, air resistance coefficient), and if the properties of the system do not change, the quasiperiod is a fixed value.
To verify that the transferred charge curve, the current curve is a quasi-periodic damped vibration curve, we fit the actual measured curve, as shown, the fitting equation is as follows:
Figure BDA0002672597000000125
the damping vibration curve is a typical damping vibration curve, the quasi-period and the logarithmic reduction of the damping vibration curve are only related to the system property, and if the system property is kept unchanged, the damping vibration curve is a fixed value. It can be seen from the figure that the quasi-period of the actually measured curve substantially coincides with the fitted curve, but the amplitude of the vibration deviates. Because the vibration equation of the vibrator follows the rule of (1.34) under the action of spring force, air resistance and friction force, the amplitude reduction rate is irregular.
After the vibrators are released from positions 3cm, 4cm and 5cm away from the origin position respectively, curves of the transfer charge quantity and the current of the M-TENG along with the change of time are shown in fig. 7-9, the quasi period of the M-TENG is 0.189 +/-0.002 s, errors mainly come from two aspects, namely errors caused by a testing device (a Keithley 6514 electrometer), and the sampling rate of the M-TENG is 1000 (1000 points are collected in 1 second). Secondly, from the M-TENG device, firstly, the surfaces of two friction layers are not absolutely uniform (the sliding friction force borne by the vibrator is changed), then the movement of the vibrator is not quasi-periodic movement, and secondly, the vibrator is not aligned when being released, so that the vibrator swings left and right in the movement process. The M-TENG structure and the material performance are improved, the sampling rate of the testing equipment is set to be higher, and the error of the testing equipment can be reduced. In addition, we also verified that the friction force alignment period was substantially unaffected, as shown in fig. 10 and 11 (the numbers on the pictures are the time coordinates corresponding to the peaks), the rough a4 paper and the smoother acrylic square plate were used as the base material (as the B layer of the friction material) of M-TENG (both released at 4cm from the origin). As can be seen from fig. 10, the vibrator was stationary at the equilibrium position after 1.5 quasiperiods, which are 0.187 ± 0.002s, while damping vibration on rough a4 paper. When the vibrator moves on the acrylic square plate, the vibrator is static after undergoing 3.5 quasiperiods, the quasiperiod is 0.188 +/-0.002 s,
the M-TENG was tested at different tilt angles (10 ° to 60 °). Its quasiperiod is 0.189 ± 0.02 seconds, that is to say the angle has no influence on the quasiperiod of the M-TENG, since the component of the gravitational force in the direction of movement is independent of the movement time. As shown in fig. 12.
M-TENG can also be used in a variety of environments without affecting its accuracy. Vibrators of different masses (5.8g to 34.8g, mass of square grooves without acrylic) are tested and are used as quasiperiods corresponding to damping vibration. Since the coefficient of air resistance is much smaller than the spring coefficient of stiffness, the effect of the air resistance γ (δ) can be neglected2＝γ2/4m20) to yield the following formula:
Figure BDA0002672597000000131
from the above equation, it can be seen that the oscillator mass is linear with the square of the quasiperiod, as shown in fig. 13.
During the use, the laboratory technician only need place the sample that awaits measuring in the weighing groove, then presses or pulls the weighing groove and make under the spring action back and forth movement, just can realize the measurement of quality.
The M-TENG can also be used in a completely weightless environment because it measures mass according to the motion law of an object, and the principle of the conventional mass measuring instrument is basically realized by pressure, such as a balance, an electronic scale and the like, and the mass measuring instrument cannot be used in a completely weightless environment.
In addition to accurate mass measurement, M-TENG has two applications in the following directions. Firstly, the method is used for detecting the vacuum degree, the invention discusses the friction damping vibration without air resistance in detail, and the quasi period T is 2 pi/w0. Damped vibration with air resistance, quasi-periodic
Figure BDA0002672597000000141
Is obviously Tt> T. If the measured quasiperiod of M-TENG in an environment is closer to the former, or the measured quasiperiod value is smaller, the higher the vacuum level of the environment is.
A second application of the invention is for detecting whether the surface of an object is uniform. If the surface of the object is not uniform, this means that the friction experienced by the transducer as it moves across the surface varies, in which case the quasiperiod measured by M-TENG is not a fixed value. In a word, the self-driven mass sensor based on TENG is designed and manufactured, and not only can be used for accurately measuring the mass of an object, but also can be used for detecting the vacuum degree and detecting whether the surface of the object is uniform or not. Simple structure, with low costs and be applicable to multiple environment.
The present invention is not limited to the above embodiments, for example, the friction material a and the friction material B are respectively selected from one of polytetrafluoroethylene, acrylic plate, polyimide, polyethylene terephthalate, perfluoroethylene propylene copolymer, aluminum, copper, silver, polypropylene, polystyrene, nylon. The U-shaped frame and the round tube are both made of plastic or glass. The conductive electrode is not limited to the aluminum electrode, and other conductive materials may be used. Those of ordinary skill in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (7)

1. A friction nanometer generator self-driven mass sensor based on a one-dimensional under-damped motion mode is characterized in that: the bottom plate is provided with a round pipe above the bottom plate, the two ends of the round pipe are respectively fixedly installed through two supporting plates positioned on the bottom plate, a weighing groove is sleeved on the round pipe, a spring is arranged between the weighing groove and one of the supporting plates, the spring is sleeved outside the round pipe, a friction material layer A is arranged on the outer side of the groove bottom of the weighing groove, a friction material layer B is paved on the bottom plate along the extending direction of the round pipe, a pair of conductive electrodes with the same specification are pasted on the lower side of the friction material layer B along the telescopic motion track of the weighing groove, a gap is formed between the pair of conductive electrodes, and when the spring is in an initial state, the gap is positioned at the central position of the weighing groove, the friction material layer A can be in contact with the friction material layer B, the friction material A and the friction material B are two different materials with electronegativity, and the one-dimensional underdamping vibration is quasi-period vibration, and the quality measurement is realized by measuring the quasiperiod of the one-dimensional underdamped vibration.
2. The self-driven mass sensor of the friction nano generator based on the one-dimensional under-damped motion mode as claimed in claim 1, wherein: the friction material A and the friction material B are respectively selected from one of polytetrafluoroethylene, acrylic plates, polyimide, polyethylene terephthalate, perfluoroethylene propylene copolymer, aluminum, copper, silver, polypropylene, polystyrene and nylon.
3. The self-driven mass sensor of the friction nano generator based on the one-dimensional under-damped motion mode as claimed in claim 2, wherein: the friction material A is polytetrafluoroethylene, and the friction material B is acrylic.
4. The self-driven mass sensor of the friction nano generator based on the one-dimensional under-damped motion mode as claimed in claim 1 or 2, wherein: the bottom plate and the two supporting plates are enclosed to form a U-shaped frame.
5. The friction nanogenerator self-driven mass sensor based on one-dimensional under-damped motion mode as claimed in claim 4, wherein: the U-shaped frame and the round tube are both made of plastic or glass.
6. The friction nanogenerator self-driven mass sensor based on one-dimensional under-damped motion mode as claimed in claim 5, wherein: the weighing groove is a square groove, the two ends of the weighing groove are provided with vertical connecting support lugs, and the square groove is movably sleeved on the circular tube through a through hole in the vertical connecting support lug.
7. The self-driven mass sensor of the friction nano generator based on the one-dimensional under-damped motion mode as claimed in claim 1, wherein: the conductive electrode is an aluminum electrode.
CN202010938973.5A 2020-09-09 2020-09-09 Friction nanometer generator self-driven mass sensor based on one-dimensional under-damped motion mode Active CN112067094B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010938973.5A CN112067094B (en) 2020-09-09 2020-09-09 Friction nanometer generator self-driven mass sensor based on one-dimensional under-damped motion mode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010938973.5A CN112067094B (en) 2020-09-09 2020-09-09 Friction nanometer generator self-driven mass sensor based on one-dimensional under-damped motion mode

Publications (2)

Publication Number Publication Date
CN112067094A CN112067094A (en) 2020-12-11
CN112067094B true CN112067094B (en) 2021-11-02

Family

ID=73662882

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010938973.5A Active CN112067094B (en) 2020-09-09 2020-09-09 Friction nanometer generator self-driven mass sensor based on one-dimensional under-damped motion mode

Country Status (1)

Country Link
CN (1) CN112067094B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113341213B (en) * 2021-06-11 2024-04-26 重庆大学 Portable friction nano generator sensor powered by single power supply
CN114136503B (en) * 2021-10-27 2023-07-18 贵州航天智慧农业有限公司 Method for integrating pressure sensor and humidity sensor

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5217882A (en) * 1975-04-24 1977-02-10 Tohoku Electric Power Co Inc Detection method of internal quality of elastic materials by multicycl e vibration
CN103391020B (en) * 2013-07-16 2016-02-03 北京纳米能源与系统研究所 A kind of multi-freedom-degreeenergy energy acquisition device based on friction nanometer power generator
CN104142174A (en) * 2014-07-25 2014-11-12 湖北三江航天险峰电子信息有限公司 Low-mass measurement system for microgravity environment in outer space
US9726491B2 (en) * 2014-07-25 2017-08-08 Northrop Grumman Systems Corporation Vibrating-mass gyroscope systems and method
CN106324284B (en) * 2015-06-15 2020-07-31 北京纳米能源与系统研究所 Accelerometer
CN105223343B (en) * 2015-10-19 2017-06-23 北京智博联科技股份有限公司 A kind of vibrating sensor for detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness
CN207457264U (en) * 2017-09-11 2018-06-05 浙江大学 Frictional power generation acceleration transducer
CN108429428B (en) * 2018-03-08 2019-12-10 北京大学 Electromagnetic friction composite type multidirectional vibration energy collector and manufacturing method thereof

Also Published As

Publication number Publication date
CN112067094A (en) 2020-12-11

Similar Documents

Publication Publication Date Title
CN112067094B (en) Friction nanometer generator self-driven mass sensor based on one-dimensional under-damped motion mode
Yu et al. A self‐powered dynamic displacement monitoring system based on triboelectric accelerometer
CN101319980B (en) Micro/nano scale ultra-micro force measuring device and force value tracing method
Fu et al. Triboelectric energy harvesting from the vibro-impact of three cantilevered beams
Xiang et al. A self-powered acceleration sensor with flexible materials based on triboelectric effect
Wang et al. Triboelectric nanogenerator: Vertical contact-separation mode
CN102539028B (en) Vertical ultra-micro force value measuring device based on principle of electrostatic force and source tracing method thereof
CN102047126B (en) Capacitive sensor having cyclic and absolute electrode sets
TW200302350A (en) Micro-machined accelerometer
US5009111A (en) Differential force balance apparatus
CN106324284B (en) Accelerometer
CN107525948A (en) Contact-type frictional generating acceleration transducer
US11175305B2 (en) Accelerometer based on diamagnetic levitation in a ring magnet
Miao et al. Toward self-powered inertial sensors enabled by triboelectric effect
Ghemari et al. The use of mechanical sensitivity model to enhance capacitive sensor characteristics
CN108918912B (en) Cantilever friction type self-powered electrostatic acceleration sensor
CN107576810B (en) Friction type power generation acceleration sensor
CN207457264U (en) Frictional power generation acceleration transducer
CN108593962A (en) Cantilever contacts formula self energizing electrostatic acceleration transducer
CN111060716B (en) Self-driven acceleration sensor based on friction nano generator
CN207380078U (en) Contact-type frictional power generation acceleration transducer
CN109061225B (en) Acceleration measuring device and acceleration measuring method thereof
Wang et al. Self-powered miniaturized acceleration sensor based on rationally patterned electrodes
Pratt et al. A flexure balance with adjustable restoring torque for nanonewton force measurement
Li et al. Elastic mechanism design of a CMM contact probe

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant