1265results about "Friction generators" patented technology

The invention discloses a bionic TENG sensor unit for an artificial throat and a preparation method thereof, and relates to the field of artificial throats, and the sensor unit comprises a gradient micro-dome friction layer, a strain amplification layer, an electrode layer and a back cavity substrate layer. The gradient micro-dome array realizes gradual contact through gradient change of height and diameter; the strain amplification layer converts vertical vibration into horizontal strain by using a cantilever beam-sliding block structure; the back cavity array selectively amplifies vibration at a specific frequency based on the Helmholtz resonance principle. The invention further provides a corresponding preparation method. The preparation method comprises the steps of back cavity forming, electrode deposition, microstructure manufacturing, surface treatment and the like. The sensor has the advantages of high sensitivity, good frequency selectivity and strong durability, and is particularly suitable for detecting weak laryngeal vibration signals of laryngeal patients.

The invention discloses a wearable knee joint self-powered sensing system and a use method, relates to the technical field of motion monitoring, and solves the technical problem that a motion detection sensor integrating light weight and a self-powered mode is lacked in the prior art. The motor comprises a stator part and a rotor part which are rotationally arranged, a center shaft penetrating through the stator part is arranged on the rotor part, and the stator part and the rotor part are rotationally connected through the center shaft; and a motion state monitoring module and a self-powered module are sequentially and coaxially arranged at the connecting part of the stator part and the rotor part, so that the rotation angle and direction of the knee joint are accurately detected, and key data support is provided for subsequent motion analysis and health monitoring.

The invention discloses a friction nano-generator capable of collecting fluid energy, a preparation method of the friction nano-generator and application of the friction nano-generator in heavy metal ion removal, and belongs to the technical field of nano-generators. The invention discloses a fluid energy collection friction nano-generator. The fluid energy collection friction nano-generator comprises a base, a plurality of supporting plates, stress turbine blades, a rotating shaft, a contact separation assembly and a sliding friction assembly. Through structural innovation and optimization, high voltage is realized by using a contact separation mode, and meanwhile, high current output is realized by considering an independent layer mode. The composite structure design improves the adaptability of the system, so that the system can keep efficient energy conversion in various working environments, and the limitation of unbalanced voltage and current output in the traditional design is overcome. The composite design not only breaks through the power bottleneck of the traditional TENG, but also provides a new idea for efficient energy capture in a more complex mechanical environment. Compared with the prior art, the electric output performance and the device operation are greatly improved.

The invention discloses a liquid metal enhanced triboelectric material with a bionic surface and a preparation method of the liquid metal enhanced triboelectric material, and belongs to the technical field of triboelectric materials. The preparation method comprises the following steps: mixing an interface stabilizer TEMPO oxidized nanocellulose with a liquid metal gallium-indium alloy to obtain TOCNF (at) LM liquid metal-based micro-nano liquid drops; and doping the obtained TOCNF-coated LM liquid metal-based micro-nano liquid drops into a base material waterborne polyurethane, and constructing a bionic rose petal micro-mastoid process structure by adopting a template method, so as to obtain the liquid metal enhanced triboelectric material with a bionic surface. The composite material with the rose petal micro-nano structure is prepared through bionic design, the micro-mastoid structure of rose petals is successfully re-carved, and the triboelectric property of the waterborne polyurethane is remarkably improved by utilizing TOCNF at LM liquid metal-based micro-nano liquid drops, so that the open-circuit voltage of the prepared composite material reaches 250V, the short-circuit current reaches 8.19 mu A, and the triboelectric property of the waterborne polyurethane is remarkably improved. The short-circuit transfer charge quantity reaches 95nC, and theoretical and practical guidance is provided for the design of a high-performance triboelectric material.

The invention belongs to the technical field of electromagnetic induction and friction nanometer power generation, and particularly relates to a vibration energy collector based on electromagnetic induction and friction nanometer hybrid power generation. Comprising a friction nanometer power generation unit and an electromagnetic induction unit. The friction nanometer power generation unit comprises an upper insulating support plate, a lower insulating support plate and a friction pair; the friction pair comprises an upper friction assembly and a lower friction assembly, and the upper friction assembly and the lower friction assembly trigger the contact and separation process through external vibration to achieve friction electricity generation. The electromagnetic induction unit comprises a coil, a magnet and a steel body which are sequentially nested, the coil and the magnet are fixedly connected with the upper friction assembly and the lower friction assembly respectively, the steel body is fixedly connected with the lower insulation supporting plate, the magnet and the steel body form a closed magnetic circuit, and the magnet and the coil trigger relative movement through external vibration to achieve electromagnetic power generation. The device is novel in structure and distinct in gradation, integrates a triboelectrification effect and an electromagnetic induction principle, has high-voltage output and high-current characteristics, and can efficiently realize continuous conversion from environment vibration energy to electric energy.

The invention belongs to the technical field of energy conversion, and particularly relates to a triboelectricity-thermoelectricity composite cement-based material and a preparation method and application thereof. The triboelectricity-thermoelectric composite cement-based material comprises a cement-based thermoelectric material and a triboelectricity material which are subpackaged, the cement-based thermoelectric material comprises the following components: a carbon nanomaterial, a nano thermoelectric alloy, a conductive polymer, a carbon nanomaterial dispersing agent, a high-performance water reducing agent, water and cement, the triboelectric material includes a triboelectric polymer and a curing agent. The triboelectricity-thermoelectricity composite cement-based material has high energy conversion efficiency and high electric energy output power, and can be applied to a self-powered cathode protection structure and / or an energy conversion and collection device.

A power transmission line vibration energy collection device based on a triboelectricity-electromagnetic effect belongs to the technical field of power transmission line self-powered equipment, and comprises a shell, a wire clamp device, a triboelectricity unit, a vibrator structure and a cantilever beam structure, and can collect multi-frequency and multi-amplitude vibration energy of a power transmission line in the vertical direction. And the cantilever beam-magnetic coupling structure is adopted to improve the low-order modal frequency, so that the vibration frequency response range of the self-powered device is widened, and the self-powered device has the following advantages that 1, efficient low-frequency energy collection is realized, and the vibrator structure can effectively collect low-frequency vibration energy by virtue of the gravity of the vibrator structure and the action of the supporting spring; 2, the fatigue resistance is excellent, and the cantilever beam does not directly participate in excitation of the triboelectric energy harvesting unit, so that the risk of fatigue fracture of the cantilever beam is effectively reduced; and 3, the energy collection capability of the device is improved, and friction electricity energy harvesting and electromagnetic energy harvesting are combined, so that the collection efficiency of high-frequency excitation energy can be further improved.

The invention relates to the technical field of energy, in particular to a power management circuit and a power supply system, which are used for reducing circuit loss and improving output performance and output efficiency of an energy device at low output voltage. The power management circuit comprises a rectifying circuit, a primary step-down circuit and at least one secondary step-down circuit which are connected in sequence, the input end of the rectifying circuit is connected with the energy device, the rectifying circuit is used for converting alternating current output by the energy device into direct current with a first voltage value, and the first voltage value is determined in advance according to a charge-voltage output characteristic curve of the energy device; the primary step-down circuit is used for reducing the direct current of the first voltage value into a second voltage value, and the second voltage value is determined according to the output power of the energy device under each voltage value; and the at least one secondary step-down circuit is used for reducing the direct current of the second voltage value to a target output voltage.

The invention discloses a grease lubrication friction electricity passive wireless rotating speed sensor for bearing slip monitoring, which comprises two bearing seat cover bodies for mounting a bearing body, a friction nanometer generator, a signal processing module and a power supply management module, and is characterized in that the friction nanometer generator consists of a rotor unit and a stator unit; the inner ring surface of the bearing body is fixedly connected with a rotating shaft, and the rotating shaft can sequentially drive the bearing retainer and the rotor unit to rotate so as to output electric energy. The rotor unit and the stator unit are arranged, an interface grease lubrication strategy is utilized, the energy supply level and durability of the friction nanometer generator are improved at the same time, and wireless real-time monitoring of the slipping state of the bearing body in a compact space in a transmission system can be achieved without the help of an external power source; the working reliability and the intelligent operation and maintenance level of mechanical equipment are improved, and high-performance operation of high-end equipment is further guaranteed.

The invention relates to a bioelectronic surgical suture for suture tension monitoring, the surgical suture comprises a cannula and a conductive material, the cannula is a hollow capillary tube, and the conductive material is arranged in the cannula through perfusion and is subjected to first laser scanning treatment after perfusion; a micro-nano structure is manufactured on the outer wall of the sleeve through second laser scanning. According to the principle of friction nanometer power generation, the tension of the surgical suture causes the change of the contact area between the suture and tissue and the change of an output electric signal in the collection process, the tension of the surgical suture can be reversely deduced, and the purpose of monitoring the surgical suture tension is achieved. The operation line is a self-powered sensor, and an external power supply is not needed. The operation line can provide different quantitative feedbacks according to different suturing modes and suturing parts, and is combined with clinical suturing experience of doctors to assist in establishing a tension quantitative model, so that the doctors are helped to optimize operation procedures, postoperative complications are reduced, and wound healing is promoted.

The invention provides a multi-mode triple composite vibration energy acquisition device based on a frequency division technology and a self-powered sensing system. The multi-mode triple composite vibration energy acquisition device comprises a shell, an electromagnetic power generation element, an elastic piezoelectric power generation element and a friction nano power generation element, the electromagnetic power generation element comprises a magnet vibrator and a coil, electromechanical coupling control switches are arranged on the two sides of the magnet vibrator respectively, and each electromechanical coupling control switch is connected with one side of the magnet vibrator through a first elastic unit and an inerter which are connected in parallel. A coil is arranged on the shell on the outer side of the magnet vibrator, and electric energy is generated through reciprocating motion of the magnet vibrator; a friction nanometer power generation element is arranged between the magnet vibrator and the electromechanical coupling control switch, and electric energy is generated by changing the distance between the magnet vibrator and the electromechanical coupling control switch; and an elastic piezoelectric power generation element is arranged between the electromechanical coupling control switch and the wall surface of the shell. Automatic switching of electromagnetic power generation, friction power generation and piezoelectric power generation can be realized under excitation of different frequencies.

The invention provides a low-coupling flexible self-powered multi-mode sensor and a preparation method and application thereof, and belongs to the technical field of flexible electronic materials. Comprising a temperature sensing layer, a pressure sensing layer and a humidity sensing layer which are stacked in sequence. The temperature sensing layer is made of a PEDOT: PSS / MWCNT composite material and outputs a temperature response signal through resistance change; the pressure sensing layer is formed by combining a PDMS layer with a micro-nano structure and a PET layer, and outputs a pressure response voltage signal based on a triboelectric effect; the humidity sensing layer is composed of PVA / CA composite matrix and EGaIn liquid metal, and humidity response signals are output through hygroscopicity induced resistance change. The sensor realizes simultaneous detection of three physical quantities of temperature, pressure and humidity, has low coupling degree among the sensing units, and can be applied to the fields of robot interaction, wearable health monitoring and environment monitoring.

A friction nanometer generator disclosed by the present invention comprises a collection unit, a conversion unit and an output unit, the collection unit comprises an input shaft and a base, the conversion unit comprises a roller and a fixed cylinder, the outer wall surface of the roller and the inner wall surface of the fixed cylinder are both provided with friction materials, and the polarities of the friction materials of the roller and the fixed cylinder are opposite; the output unit comprises an energy storage electrode layer and an output electrode layer. The input shaft drives the roller to rotate, the roller and the inner wall of the fixed cylinder rub and roll, and friction materials of the roller and the fixed cylinder have opposite polarities and rub to generate electric energy; the generated electric energy is injected into the energy storage electrode layer, the energy storage electrode layer transmits energy to the output electrode layer through electrostatic induction, and the output electrode layer generates current output. Friction resistance and material abrasion are reduced in a rolling contact mode, the energy storage electrode layer and the output electrode layer of the output unit are of a non-contact structure, a large number of charges are generated due to electrostatic induction, an efficient electric energy output system is formed, and the charge density and the output performance of the friction nanometer generator are effectively improved.

The invention discloses a preparation method and application of circumferentially limited supercritical foaming self-packaging TENG, and the preparation method comprises the following steps: uniformly mixing a PDMS precursor and a curing agent, pouring the mixture into a mold, and putting the mold into a vacuum oven for curing to obtain a PDMS film; adhering the PDMS film to the middle position of the PI film through a double-sided nickel conductive adhesive tape, then putting the PDMS film into a mold, putting a thermoplastic elastomer on the upper layer, and performing hot pressing by using a vacuum auxiliary hot press to obtain a prefabricated sample; putting the prefabricated sample into a supercritical foaming reaction kettle, controlling the temperature to 70-130 DEG C, injecting supercritical fluid into the foaming reaction kettle, after the prefabricated sample and the supercritical fluid form a saturated and stable blending system, maintaining for 0.8-1.5 hours, taking out the blended system, and naturally cooling to room temperature, so as to obtain the TENG. The preparation method has the beneficial effects that the self-assembled and self-packaged TENG with the bionic dome structure is successfully prepared through cooperation of a supercritical fluid technology and a limited foaming strategy, and the technical scheme of the self-assembled and self-packaged TENG obtains breakthrough progress in the aspects of the preparation process, the structural design and the environmental adaptability.

The invention relates to a vibration and state monitoring system and monitoring method based on a friction nanometer generator. The vibration and state monitoring system comprises a shell, a vibrator assembly, a power generation unit, an energy storage unit, a vibration and state monitoring unit and a signal processing and transmitting unit, the power generation unit comprises two pairs of power generation friction layers and two power generation electrode layers, the two power generation electrode layers are located between the two pairs of power generation friction layers respectively, one pair of power generation friction layers are arranged on the left side of the vibrator assembly, and the other pair of power generation friction layers are arranged on the lower side of the vibrator assembly; the vibration and state monitoring unit comprises two pairs of vibration and state monitoring friction layers and two vibration and state monitoring electrode layers, and the two vibration and state monitoring electrode layers are located between the two pairs of vibration and state monitoring friction layers respectively. The friction nanometer generator designed by the invention combines the functions of energy collection and vibration and state monitoring, stably supplies power to the capacitor and the wireless transmission module, and realizes the monitoring of a mechanical interface state which is difficult to detect by a traditional sensor.

The invention discloses a sensing device for ball hitting detection and a tennis racket. The sensing device comprises a sensor element, and the sensor element is combined with a data fusion algorithm to conduct data monitoring on the ball hitting force, the ball hitting speed and the ball hitting position of the tennis racket; the sensor element comprises an IMU (Inertial Measurement Unit) sensor, physical quantity parameters in a tennis racket batting and waving process and an acoustic sensor, and is used for analyzing batting force, batting speed and batting position; the Bluetooth communication element is used for realizing wireless communication; the energy collector is used for converting kinetic energy generated by ball hitting of the tennis racket into electric energy to supply power to the sensor component; data monitoring is carried out on the ball hitting force, the ball hitting speed and the ball hitting position, the IMU sensor, the acoustic sensor and the energy collector are used in cooperation and combined with a data fusion algorithm, the defects of a traditional single sensor are effectively overcome, the positioning and tracking precision is improved, the energy collector is used for storing and using electric energy, and the positioning and tracking precision is improved. And power consumption is reduced.

The invention relates to the technical field of nano-generators, in particular to a triboelectric material of nano-porous composite fibers and a preparation method and application of the triboelectric material of the nano-porous composite fibers, and the preparation method comprises the following steps: adding polyvinylidene fluoride and perfluoroethylene propylene copolymer nanoparticles into a mixed solvent of N, N-dimethylacetamide / acetone; uniformly mixing to obtain a polyvinylidene fluoride / perfluoroethylene propylene copolymer nanoparticle spinning emulsion; and carrying out electrostatic spinning on the polyvinylidene fluoride / perfluoroethylene propylene copolymer nanoparticle spinning emulsion to obtain the triboelectric material. The triboelectric material prepared through the method is a high-charge-density super-hydrophobic nano-generator material based on electrostatic spinning, the electrostatic spinning porous composite fiber material is used as a friction medium layer, high surface charge, hydrophobicity and fouling resistance are achieved, and the performance of a flexible solid-liquid interface nano-generator is improved.

The invention relates to the technical field of sensor sensing, in particular to a self-power-generation sensing sensor, a mechanical claw and a mechanical claw clamping force sensing method.The self-power-generation sensing sensor comprises an elastic body, a first friction electrode, a second friction electrode and a multi-channel data acquisition board, and an inner mounting cavity is formed in the elastic body; the first friction electrode and the second friction electrode are oppositely arranged and located in the internal mounting cavity, a negative electrode welding point is formed on the first friction electrode, and a positive electrode welding point is formed on the second friction electrode; and the multi-channel data acquisition board is respectively connected with the cathode welding point and the anode welding point through wires. The flexible triboelectric sensor is formed by the elastic body, the first friction electrode, the second friction electrode and the multi-channel data acquisition board, is not limited by own stretchability, is simple in structure, does not need an external power supply, realizes pressure monitoring of self-power generation, and expands the use scene of the sensor.

The invention relates to a friction and electromagnetic combined type wave energy power generation device, and relates to the field of wave energy power generation devices. Comprising a cylindrical shell, a floating ball structure and a stress disc. The first end of the cylindrical shell is sealed, a fixed shaft is fixed to the inner axis and slidably sleeved with a sliding framework, and a composite power generation assembly is arranged in the cylindrical shell. When waves exist on the sea surface, due to the fact that the floating ball structure is subjected to buoyancy and thrust of the waves, the stress disc and the floating ball structure are subjected to opposite force, and the sliding framework can move relative to the fixed shaft, so that electromagnetic power generation and friction power generation are achieved. Even if the sea surface is flat and quiet, as long as the water body below the sea surface flows relatively and the flow velocity difference exists between the upper part and the lower part of the stress disc, buoyancy or sinking force can be generated, the sliding framework can move relative to the fixed shaft, and finally electromagnetic power generation and friction power generation are realized, so that the power generation efficiency is effectively improved.

The floatable instantaneous generator comprises an outer layer in the form of a hemispherical floatable supporting bowl and an inner layer in the form of a liquid-solid triboelectric nano generator (ls TENG); the inner layer includes a fluorinated ethylene propylene (FEP) layer on an inner side of the bowl, a ring electrode on an upper surface of the FEP layer around a periphery thereof, a circular electrode on a bottom surface at a central portion of the FEP layer, and a droplet slidable on the upper surface of the FEP layer. When subjected to open sea waves, the bowl floats and tilts the ls TENG so as to slide droplets on the upper surface of the FEP, thereby creating and disconnecting contact between the ring electrode and the circular electrode and providing power to an electrical circuit connected between the ring electrode and the circular electrode.

The invention provides an ocean self-driven monitoring device, and relates to the technical field of nanometer friction. The device comprises a central bearing plate, a plurality of pairs of protection plates, a rotating column, a power supply assembly and a power utilization assembly. According to the ocean self-driven monitoring device, the photovoltaic thermoelectric assembly, the water drop friction power generation assembly and the F-TENG flexible kelp power generation assembly are integrated through the center bearing plate, the protection plate, the rotating column and other structures, efficient power generation is achieved through multiple kinds of energy of the ocean, meanwhile, the power source assembly is arranged, electric energy is reasonably distributed and utilized, and the service life of the ocean self-driven monitoring device is prolonged. And a sensor, a controller and a signal transceiving unit in the electric component are adopted to realize ocean self-driven monitoring.

An Archimedes ocean energy harvesting device, comprising a floating body (1) and a thin-plate contact-separation TENG (2). The floating body (1) is mounted below a water surface and is capable of moving with wave fluctuations, thereby driving the thin-plate contact-separation TENG (2) loaded inside the floating body (1) to generate electricity. The floating body (1) comprises a silo (11), a buoy (12), and an elastic annular waterproof belt (13) connecting the silo (11) and the buoy (12). The silo (11) is inserted upwards into the buoy (12), and the waterproof belt (13) connects the buoy (12) and the silo (11) to form a closed cylindrical chamber. The thin-plate contact-separation TENG (2) is mounted in the cylindrical chamber, and comprises a fixing mechanism (24), a connecting rod (23), a plurality of circular friction discs (21) and a plurality of electrode discs (22), wherein the friction discs (21) and the electrode discs (22) are alternately arranged in parallel along the axial direction of the cylindrical chamber, and the friction discs (21) and the electrode discs (22) are respectively fixed on the buoy (12) and the silo (11).

The invention relates to the field of pore-forming control, and particularly discloses a drilling machine pore-forming method suitable for different rock stratums, comprising the following steps: S1, acquiring stratum data; s2, obtaining different rock stratum distribution data of the operation area according to the stratum data, and constructing a three-dimensional geologic model; s3, according to the three-dimensional geologic model, simulating to obtain an optimal drilling path without damaging the ground; s4, simulating an interaction mechanism of the drill bit and different rock stratums according to the optimal drilling path to obtain working parameters of the drill bit with the optimal hole forming quality in the different rock stratums; and S5, the working parameters of the drill bit in the different rock stratums are input into a control system of the jumbolter, and the control system adjusts the drill bit to the matched working parameters according to the data of the different rock stratums. The method can greatly improve the hole forming quality of the weathered rock stratum, improve the construction progress and reduce the engineering cost.

The invention discloses a self-excitation cooperative energy management circuit for enhancing TENG output performance, and belongs to the technical field of power electronics. The self-excitation cooperative energy management circuit is connected to the rear end of the TENG and comprises a self-charge excitation circuit, a capacitance converter circuit and a voltage reduction circuit, and the self-charge excitation circuit is connected to the rear end of the TENG, comprises a rectification circuit and is used for charge excitation of the TENG, rectification and output of a first direct current signal; the capacitance converter circuit is connected to the rear end of the self-charge excitation circuit and is used for performing power conversion on the first direct-current signal and outputting a second direct-current signal; the voltage reduction circuit is connected to the rear end of the capacitance converter circuit, comprises a switching circuit and is used for reducing voltage and increasing current of the second direct-current signal and outputting a third direct-current signal. According to the self-excitation collaborative energy management circuit, the charge output capability of the TENG can be greatly improved, and an electronic device can be directly driven.

The invention discloses a composite hydrophobic fiber membrane based on a friction nano-generator and a preparation method of the composite hydrophobic fiber membrane. The composite hydrophobic fiber membrane is composed of a polyvinylidene fluoride nanofiber membrane, boracite particles, hydrophobic nanoparticles and polyvinylidene fluoride microspheres. The boracite particles are embedded in fibers of the polyvinylidene fluoride nanofiber membrane, and the hydrophobic nanoparticles are uniformly attached to the polyvinylidene fluoride microspheres and the polyvinylidene fluoride nanofiber; the hydrophobic nano particles are titanium dioxide nano particles or zirconium dioxide nano particles. The preparation method comprises the following steps: dispersing boracite powder and polyvinylidene fluoride powder into N, N-dimethylformamide to prepare an electrostatic spinning solution; the preparation method comprises the following steps: dispersing hydrophobic nanoparticles and polyvinylidene fluoride powder into N, N-dimethylformamide to prepare an electrostatic spraying solution; the composite hydrophobic fiber membrane is prepared through synchronous electrostatic spinning and electrostatic spraying. The problem that a modified polyvinylidene fluoride fiber membrane friction nanometer generator is low in output electrical performance in a high-humidity environment can be solved.

The invention discloses a friction nanometer power generation device and method based on a mechanical frequency increasing structure, and the device comprises a housing, a first friction wheel, a second friction wheel, and a driving mechanism. The first friction wheel is fixed to the shell, and the second friction wheel is rotationally connected to the shell through a rotating shaft. The driving mechanism comprises a linear rack and a gear transmission mechanism; the gear transmission mechanism comprises a first-stage gear, a second-stage gear and a third-stage gear; the first-stage gear is rotationally connected into the shell through a first rotating shaft; the secondary gear is mounted on the second rotating shaft; and the third-stage gear is mounted on the rotating shaft. According to the friction nanometer power generation device, low-frequency vibration energy can be converted into high-frequency input through the frequency raising structure, so that the output performance of the friction nanometer power generation device is improved, meanwhile, the problem that the output power of a common friction nanometer power generator is insufficient can be effectively solved, and therefore continuous output of voltage and current is achieved.

The invention relates to the technical field of power generation, in particular to a wave energy collecting device for power generation of a paper folding structure. The wave energy collecting device comprises a rotating disc, a translation assembly, a driving assembly, a fan-shaped column, at least one paper folding friction power generation structure and at least two movable friction power generation structures, and by means of the deformable characteristic of the paper folding structure, the surface contact area of a friction nanometer power generator can be effectively increased in a limited space, and the wave energy collecting device for power generation of the paper folding structure is more stable. Therefore, the charge transfer and output performance is optimized. Meanwhile, the paper folding structure is simple in design, easy to manufacture and integrate, good in flexibility and adaptability and capable of adapting to mechanical movement of different frequencies and amplitudes.

The invention relates to the field of pressure sensors, in particular to a triboelectric pressure sensor and a sleep monitoring method and system. The triboelectric pressure sensor comprises a positive friction layer, a negative friction layer, a deformation electrode connected to the negative friction layer and a flexible electrode connected to the positive friction layer. The contact ends of the tips of the multiple micro-cone structures of the positive friction layer all face the negative friction layer, and gaps are formed between the contact ends and the negative friction layer. The Young modulus of the negative friction layer is smaller than that of the micro-cone structure, so that when the negative friction layer approaches the deformed electrode, the negative friction layer sinks and makes contact with the side face of the micro-cone structure. The change amplitude of the contact surface along with the pressure is large, so that the sensitivity of the sensor is improved. Respiration and pulse frequencies are respectively detected by a triboelectric pressure sensor to obtain electric signals, the electric signals are segmented and enhanced into waves, then the waves are classified by a big data method, a learning model for identifying sleep state categories corresponding to the waves is obtained, the categories are further rapidly and accurately identified, and an alarm is given according to the number of abnormal times. The method and the system have high reliability.

The application discloses a damping device and a damping method, which combines a friction generator with a damping component, so that the friction generator outputs an electric signal under the action of an external vibration source, and when the electric signal is transmitted to the damping component, the electric signal can adjust the inherent frequency of the damping component itself, so that the adjusted inherent frequency is different from the vibration frequency provided by the external vibration source, so that the damping component and the external vibration source cannot achieve resonance, thereby achieving the purpose of damping; and since the electric signal is provided by the friction generator, an external excitation power supply is not needed, the dependence on the external excitation power supply is reduced, and passive damping is achieved; in addition, the damping device does not need a complex structure, and only needs to combine the friction generator with the damping component to achieve damping, so that the structural complexity of the damping device is effectively simplified, the manufacturing cost of the damping device is reduced, and the manufacturing efficiency of the damping device is improved.

The invention relates to the technical field of vibration energy collection, in particular to a multi-mode composite friction nano-generator based on magnetic bistability. Comprising a rectangular shell, a rectangular sliding part is arranged in the rectangular shell, a vertical connecting plate body is arranged in the middle of the top of the interior of the rectangular shell and extends downwards into the rectangular sliding part, and an elastic reset assembly and a magnetic bistable mechanism are jointly arranged on the vertical connecting plate and the rectangular sliding part; contact separation type friction nanometer power generation units are arranged on the front end face and the rear end face of the rectangular sliding part and the corresponding inner wall face of the rectangular shell. Grid type sliding friction nanometer power generation units are arranged on the left side end face, the right side end face and the lower bottom face of the rectangular sliding part and the corresponding inner wall face of the rectangular shell. According to the invention, two modes of friction nano-generators and a magnetic bistable mechanism are integrated, so that the conversion efficiency of mechanical energy is remarkably improved; the defect of narrow frequency band of a traditional linear generator is overcome.