124results about How to "Improve energy capture efficiency" patented technology

The invention relates to an arm-length-variable vertical shaft tide current water turbine generator set which belongs to the field of development of renewable energy sources. The generator set mainly comprises a blade, an arm seal, a telescopic arm, a piston, a fixed arm, a hydraulic cylinder for shortening, a hydraulic cylinder for extending, a support wheel disk, a compressing nut, a tide current speed and direction sensor, a main shaft, a main shaft bearing, a big gear, a support seat, a hydraulic oil station, a hydraulic pump for shortening, a hydraulic pump for extending, an electric brush, an integrated control system, a shaft neck seal, a small gear shaft bearing, a small gear shaft, a coupling and a generator. The telescopic arm is dynamically extended or shortened in the rotatingprocess of the blade according to the tide current direction and flow speed; and when the normal of the telescopic arm is parallel or perpendicular to the tide current direction, the telescopic arm is respectively changed to be the longest or shortest so that a vertical shaft tide current water turbine reaches highest energy capture efficiency. The self-start capability of the water turbine on low-speed tide current can be also improved by adjusting the telescopic arm. The arm-length-variable vertical shaft tide current water turbine generator set disclosed by the invention can be used for the comprehensive utilization and development of river water flow energy and ocean tide current energy.

The present invention relates to an energy harvesting apparatus capable of converting small magnitude low frequency vibrational energy into useful electrical energy that may be stored and used to power microelectronic devices and rechargeable battery technologies. The energy harvesting apparatus utilizes a piezoelectric device coupled to a pneumatic controller for modulating the vibrational energy received from vibrational energy source into a useful alternating energy waveform. A rectifier is further coupled to the piezoelectric device for converting alternating electrical energy to direct current energy for supporting associated external circuitry.

A piezoelectric energy captor enabling to capture energy and store energy effectively consists of piezoelectric beam formed by two layers of piezoelectric ceramic plates and intermediate sandwich layer, electrode prepared by plating metal silver on ceramic plate, inductance coil with control switch, bridge type of rectifier, rectifying capacitor, Cuk type of dc-dc converter formed by transistor switch and electric inductance as well as diode, filtering capacitor for stabilizing charge current, and energy storing battery.

The invention discloses a swing wing type ocean current energy power generating device. The swing wing type ocean current energy power generating device comprises a supporting frame, a motion mechanism is connected to the supporting frame and connected with an energy extracting mechanism, the energy extracting mechanism comprises a crank and rocker mechanism which transmits energy extracted from the motion mechanism to an energy conversion mechanism, and the energy conversion mechanism comprises a power generator; and the motion mechanism is connected with an attack angle adjusting mechanism, and the attack angle adjusting mechanism adjusts and controls an attack angle degree of the motion mechanism so as to enable the motion mechanism to achieve preset pitching motion. The hydrofoil attack angle adjusting mechanism is arranged, so that the problem in control over the hydrofoil attack angle degree is solved; and as the hydrofoil pitching motion is accurately controlled by monitoring the position of a swing rod, the swing wing type ocean current energy power generating device can adapt to different water flow speeds, kinetic energy of the water flow is sufficiently captured, and the power generation efficiency and power are improved. A transmission system composed of a four-link mechanism and a synchronization belt in a transmission manner is used, so that the structure is simple, mechanical losses are small, and the conversion efficiency is high.

The invention discloses a compound pendulum frequency upconversion type wave energy collecting device. The compound pendulum frequency upconversion type wave energy collecting device comprises a shell, a compound pendulum mechanism, a driving gear, an electromagnetic power generating mechanism and a piezoelectric power generating mechanism. The shell floats on the water surface and swings along with waving, the compound pendulum mechanism is rotationally arranged in the shell and rotates along with swinging of the shell, and driving gear is rotationally arranged in the shell, and the driving gear and the compound pendulum mechanism rotate synchronously. The electromagnetic power generating mechanism is arranged in the shell and used for being in engaged transmission with the driving gear to be driven by the driving gear to generate power through electromagnetic induction. The piezoelectric power generating mechanism is arranged in the shell and located above the end face of the drivinggear and is used for generating deformation to generate power through a piezoelectric effect when the driving gear rotates. Thus, when the shell non-directionally swings along with waving, the compound pendulum mechanism generates non-directional rotation and adapts to dynamic changes of water surface wave energy, and high energy harvesting efficiency is achieved. Meanwhile, the electromagnetic power generating mechanism and the piezoelectric power generating mechanism carry out energy conversion through two different electromechanical coupling energy exchange mechanisms, the spectrum coverage range on wave energy is wide, high adaptability is achieved, and the conversion efficiency is high.

The invention relates to a multi-frequency coupled vibration energy capturer comprising multiple piezoelectric cantilever beams (1), a base frame (3), and an electric control plate (4). The piezoelectric cantilever beams (1) are installed on the base frame (3). Permanent magnets (2) are disposed on the piezoelectric cantilever beams (1). The multiple piezoelectric cantilever beams (1) have same length and different thicknesses. The permanent magnets (2) are arranged on the same positions of the multiple piezoelectric cantilever beams (1). The multiple piezoelectric cantilever beams (1) are connected with the electric control plate (4) through a line. Each piezoelectric cantilever beam (1) is composed of a metallic sheet (5), a piezoelectric patch (6), and a silver electrode surface (7). Compared with a product in the prior art, the multi-frequency coupled vibration energy capturer is novel and simple in structure and uses the magnetic coupling of the multiple piezoelectric cantilever beams with different inherent frequencies. When being seriously deformed, any piezoelectric cantilever beam forces other piezoelectric cantilever beams to deform. Thus, more energy can be captured in a wider frequency domain and high energy capture efficiency is achieved.

The invention relates to a magnetic suspension vibration energy capture battery, which comprises a battery top cover, a battery shell, a hollow shaft, an internal spring, an external spring, a base, two identical piezoelectric cantilever beams and four identical magnetic washer, wherein that battery top cover and the battery shell constitute a battery sealing cavity; the piezoelectric cantilever beam, the magnetic washer, the internal spring and the hollow shaft constitute a piezoelectric power generation module; and the base and external spring are used for sensing and transmitting external vibrations. When the MEMS device where the device is arranged is subjected to external vibration, the battery vibrates continuously, and the internal piezoelectric power generation module in the battery maintains continuous vibration under the function of the internal spring and magnetic force of the magnetic washers, which improves the energy capture efficiency. The device is mainly used in MEMS,wireless sensors, intelligent wearable equipment and other fields, and has the advantages of simple structure, no need for maintenance, long life, energy saving and environmental protection, easy integration and strong environmental adaptability.

The invention relates to a temperature difference and vibration composite piezoelectric energy capture battery, which comprises a battery top cover, an upper battery case, a low battery case, a heat absorbing base, an upper spring, a lower spring, an upper piezoelectric cantilever beam, a lower piezoelectric cantilever beam, a transmission rod, a dish-shaped thermal bimetallic sheet holder and a dish-shaped thermal bimetallic sheet. Wherein the battery top cover, the upper battery shell, the lower battery shell and the heat absorbing base constitute a battery shell part; the upper spring, thelower spring, the upper piezoelectric cantilever beam, the lower piezoelectric cantilever beam, the transmission rod, the dish-shaped thermal bimetallic sheet holder and the dish-shaped thermal bimetallic sheet constitute a piezoelectric power generation part. When the device is vibrated or the heat absorbing base senses the ambient high temperature, reciprocating vibration of the upper and lowerpiezoelectric cantilever beams occurs, which improves the efficiency of energy capture. When the device is arranged in the MEMS device, the requirement for supplying power to the MEMS device can be met, and the device has the advantages of simple structure, strong environmental adaptability, high energy capture efficiency and easy integration.

The invention provides a double-point elastic supporting cylinder vortex induced vibration fluid kinetic energy conversion device, relates to a fluid kinetic energy conversion device, and aims at solving problems that existing wave energy power generation devices are complex in structure, narrow in power generation frequency band, inflexible in power generation mode and low in float energy efficiency. The double-point elastic supporting cylinder vortex induced vibration fluid kinetic energy conversion device comprises a vibration excitation beam and two vibration exciters. The two vibration excitation power generators are arranged at the two ends of the vibration excitation beam in parallel. Each vibration excitation power generator comprises a connecting plate, a sealing cover, a guide column, a pedestal, two vibration columns, two vibration excitation permanent magnets, two vibrated permanent magnets, two cantilever beam piezoelectric float energy devices and four springs. The guide column is arranged on the pedestal. A cavity is formed between the lower end surface of the guide column and the upper end surface of the pedestal. The two ends of the vibration excitation beam are respectively connected with the two connecting plates. The double-point elastic supporting cylinder vortex induced vibration fluid kinetic energy conversion device is used for power generation.

The invention discloses a nested tidal current generating set of an air guide sleeve paddle-changing horizontal shaft, and belongs to the field of ocean regenerative energy development. The generating set is composed of an outer air guide sleeve, an air guide sleeve support, an inner air guide sleeve, a main shaft, a main shaft bearing, a hub, a blade, a paddle-changing bearing, a paddle-changinggear, a paddle-changing rack, a paddle-changing motor, a storage battery, a generator, a gear box and seal; and the outer air guide sleeve and the inner air guide sleeve form the nested air guide sleeve, the roof of the blade realizes the blade paddle-changing through the paddle-changing motor. The nested tidal current generating set provided by the invention has the advantages that the blade neighbouring tide flow velocity is greatly improved through the nested air guide sleeve, a paddle-changing mechanism causes a horizontal shaft to be adapted to reversing current, the efficiency is obvious high, thereby having self-starting ability at different flow rates; a complete machine structure is concise, the electrical energy output is stable, thereby having cleanness and no pollution.

The invention provides a frequency-adjustable array type piezoelectric cantilever beam energy harvester with a compact structure and high energy efficiency. Through separately arranging a plurality of piezoelectric stacks on two opposite side surfaces of an aluminum alloy substrate in an array manner, frequency adjustment is realized through different frequency adjusting capabilities of the piezoelectric stacks. Furthermore resonant frequency of the energy harvester can be efficiently adjusted automatically according to the vibrating frequency of surrounding environment automatically. Simultaneously, the invention further provides a frequency-adjustable array type piezoelectric cantilever beam energy harvesting method for the piezoelectric energy harvester. Position information of the free end of the piezoelectric cantilever beam is detected through combination of a magnet and a Hall sensor, and is input to a control circuit. The control circuit calculates according to the position information for obtaining latest electric field boundary condition values of a plurality of piezoelectric stack arrays. Furthermore a control signal is transmitted to the plurality of piezoelectric stack arrays for updating the latest electric field boundary condition values.

The invention discloses a method of manufacturing a closed porous piezoelectret energy harvester based on nanoimprint. Manufacturing and processing of an imprint mold are firstly carried out; preparation of a piezoelectret thin film is then carried out; imprint and demolding are carried out to obtain a porous thin film of the piezoelectret; multiple porous thin films are bonded to form a multilayer closed porous film; corona electret is carried out; and finally, working electrode sputtering at two ends of the multilayer closed porous film is carried out. The closed porous cavity can greatly improve the charge storage intensity and the stability, the multilayer porous structure can improve the electro-mechanical conversion efficiency, and the output of the energy harvester is improved.

The invention relates to a vertical series connection arrangement type piezoelectric energy harvester for improving a coupling effect, belongs to the technical field of water flow and air flow inducedvibration energy harvesting, and aims to solve the problems of mutual interference due to phase changes during vibration of vibrators, small vibration amplitude of traditional piezoelectric plates and low energy harvesting efficiency in a traditional parallel / series connection arrangement mode. One end of a horizontal piezoelectric cantilever beam is connected with the top end of a fixed supportbase through a horizontal clamp set, and the other end of the horizontal piezoelectric cantilever beam is connected with a horizontal turbulent column; and one end of a vertical piezoelectric cantilever beam is connected with the horizontal turbulent column through a vertical clamp set, and the other end of the vertical piezoelectric cantilever beam is connected with a vertical turbulent column. According to the vertical series connection arrangement type piezoelectric energy harvester for improving the coupling effect, the vibrators of the piezoelectric energy harvester are in a vertical series connection arrangement mode, and motion states of the vibrators do not interfere mutually, so that the energy harvesting efficiency is improved; and the piezoelectric energy harvester has the advantages of simple excitation mode, high energy harvesting efficiency, novel structure, flexible design and serialized production.

The invention relates to a piezoelectric energy harvesting and active vibration reduction integrated set comprising a plurality of inner sleeves (1), a plurality of outer sleeve (6) and an electrical control module. The inner sleeves (1) sleeve in order the outer wall of an inner cylinder (5); each inner sleeve (1) is composed of an inner sleeve base (2) and a plurality of piezoelectric beams (3) peripherally mounted on the inner sleeve base (2), and permanent magnets (4) are disposed on the piezoelectric beams (3). The outer sleeves (6) are mounted in order on the inner wall of an outer cylinder (7); each outer sleeve (6) is composed of an outer sleeve base (6) and electromagnets (9), and the electromagnets (9) are embedded in the outer sleeve base (8). The piezoelectric beams (3) and the electromagnets (9) are electrically connected with the electrical module separately. The problems that the existing piezoelectric energy harvester is low in harvesting efficiency, low in energy harvesting and vibration reduction functional integrity and large in size are solved; the piezoelectric energy harvesting and active vibration reduction integrated set is compact in structure, energy saving and reliable.

The invention relates to a vibration and temperature difference compound piezoelectric energy harvesting battery, and the battery comprises: an upper battery shell, a lower battery shell, an upper spring, a lower spring, an upper piezoelectric cantilever beam, a lower piezoelectric cantilever beam, a transmission shaft, a dish-shaped thermal bimetal sheet and a cooling tower; wherein the upper battery shell senses energy in external environment and transmits to the dish-shaped thermal bimetal sheet to enable the sheet to transform downwards at a critical temperature point, the transmission shaft is driven to move downwards, the upper piezoelectric cantilever beam is released, vibration is generated, the lower piezoelectric cantilever beam is shocked, and vibration is generated under the action of the lower spring. When the dish-shaped thermal bimetal sheet is cooled by the cooling tower, the transformation is recovered, the transmission shaft moves upwards, and the upper and the lower piezoelectric cantilever beams vibrate again. According to the invention, the device generates electricity by utilizing environmental vibration, when the device is used for MEMS equipment, power supply requirement of the MEMS equipment can be satisfied, and the device has advantages of simple structure, strong environment adaptability, high energy harvesting efficiency, easy integration and the like.

The invention discloses a wind wave and oscillation-combined floater power generation device adaptable to ice periods and a power generation method. The device comprises a single-pile foundation installed at seabed and extends out of sea surface; an anti-icing cone is installed at the intersection of the single-pile foundation and the sea surface; the top of the single-pile foundation is providedwith a tower tube; the top of the tower tube is provided with a horizontal axis wind turbine; electricity generated by the wind turbine is integrated into a power grid through a power transmission circuit; a sleeve is fixedly installed on a portion of the single-pile foundation which extends out of the sea surface; the sleeve sleeves the single-pile foundation; an annular platform is arranged at the upper part of the sleeve; two or more energy conversion systems are arranged on the annular platform; the number of the energy conversion systems is the same as the number of first connection devices; electricity generated by the energy conversion systems is transmitted to the tower tube; and the sleeve is circumferentially provided with the first connection devices at equal intervals below theannular platform, wherein the first connection devices are equal in height; and floaters of the same number with the first connection devices are arranged on the sea surface. According to the power generation device disclosed by the invention, the wave energy generating device and the wind turbine are combined, and therefore, cost can be effectively reduced, and the utilization rate of sea spaceand resources can be improved; and wind energy and wave energy are simultaneously collected for power generation, and the complementation of power in a complex environment is realized.

The invention discloses a non-linear magneto-mechanical coupled composite energy harvester, comprising a frame vertically arranged; Double parallel cantilever beams arranged horizontally are arrangedin the frame; a double parallel cantilever beam comprises two horizontal beams, the upper surface of the horizontal beam near the fixed end of the horizontal beam is provided with a piezoelectric plate, the free ends of the two horizontal beams extend along the length direction of the frame and are respectively connected with the upper and lower ends of a mass block, and the upper and lower surfaces of the free ends of the two parallel beams are respectively provided with an upper moving cylindrical magnet and a lower moving cylindrical magnet; at least two magnetostatic blocks are arranged onthe frame sidewall horizontally opposite to the mass block, and the magnetostatic blocks are embedded in the center position of the mass block in the vertical direction. The invention adopts the double parallel cantilever beam as the vibration structure, and utilizes the interaction force between the magnetostatic block and the dynamic magnetic block, so that the double parallel cantilever beam has the bistable characteristic in the movement process, and can realize the electromagnetic energy capture and the piezoelectric energy capture in the large-amplitude vibration process.

The invention discloses a device for preparing hydrogen and oxygen by using tidal current energy and seawater. According to the device for preparing the hydrogen and the oxygen by using the tidal current energy and the seawater, the problems that pollutants are generated, and a large amount of energy and fresh water resources are consumed are solved, the ocean tidal current energy is used as an energy source, the seawater is electrolyzed in an electrolytic cell so that the hydrogen can be prepared through the seawater, and the device has the advantages of being clean, efficient, free of pollution, and capable of storing and conveying the hydrogen and the oxygen . According to the technical scheme, the device comprises a tidal current energy power generation device and an electrolysis device, the tidal current energy power generation device comprises a tidal current energy power generation energy absorption unit, the tidal current energy power generation energy absorption unit is connected with a generator, and the generator provides a power supply for the electrolysis device; the electrolysis device is connected with a seawater desalination device; and the tidal current energy power generation energy absorption unit comprises a lift type energy absorption blade, a vertical center shaft of the lift type energy absorption blade is connected with a resistance type energy absorption blade, and the resistance type energy absorption blade and the lift type energy absorption blade can rotate around the vertical central shaft.

The invention discloses a forward / reverse rotating bilobed wheel horizontal shaft tide power unit, and belongs to the field of ocean regenerative energy exploitation. The power unit provided by the invention is composed of a forward impeller, a reverse impeller vane, a reverse impeller, a reverse impeller vane, an integrated transmission system, a flow-direction flow-rate sensor and a tower seat,wherein the integrated transmission system comprises a forward impeller shaft, a forward speedup generator, a storage battery, a reverse speedup generator, a reverse impeller shaft, a forward gear reducer, a forward drive motor, a controller, a reverse drive motor and a reverse gear reducer; and the forward impeller and the reverse impeller are symmetrically arranged, and simultaneously the working and rotating directions of the forward impeller and the reverse impeller are reverse. The power unit provided by the invention has the advantages of suitability for reversing current, large single-machine power, high efficiency, self starting capability at various flow rates, simple and concise appearance, stability in operation, stable electrical energy output, cleanness and no pollution.

A wave barrier or wave terminator type ocean wave energy converter (WEC) utilizing one or multiple adjacent floats together forming an elongated wave front parallel (EWFP) float rotatably connected by at least one swing or drive arm to a secondary floating or shore or seabed fixed body or frame, such that the at least one swing arm is rotating about a submerged pivot point or axle on such body or frame and constraining the motion of the float(s) relative to the body or frame when wave forces are applied against the float(s). Relative to the direction of oncoming wave fronts and relative to the still water line (SWL), the at least one EWFP float is substantially forward of, and above, the pivot point such that the float concurrently moves both upward and rearward on wave crests and returns both forward and downward on ensuing wave troughs. The rear surface of the EWFP float is substantially arcuate and concave with a radius approximating its distance from the pivot point such that the float produces minimal energy consuming back waves when it is being moved by oncoming wave forces. The lower rear arcuate surface of the float can extend below the bottom of the float deeper into the water column to capture additional wave energy.

The invention provides a double-wing type power generation device. The double-wing type power generation device comprises a base, a generator, a blade rotating angle and a swing control mechanism. One end of a main shaft is connected with the generator, and the other end of the main shaft is fixedly connected with main gears. A first shaft stretching out of the main gears serves as a crankshaft to be hinged to a second transmission rod. The other end of the second transmission rod is hinged to the middles of upper swing arms. One ends of the upper swing arms and one ends of lower swing arms are hinged to the base, and blades are installed at the other ends of the upper swing arms and the other ends of the lower swing arms. The upper swing arms and the lower swing arms are transmitted through short connecting rods and can swing symmetrically. Auxiliary gears are engaged with the main gears. A fifth shaft stretching out of the auxiliary gears serves as a crankshaft to be hinged to a first transmission rod and a third transmission rod. The other end of the first transmission rod and the other end of the third transmission rod are hinged to an upper rocker. Large chain wheels and the upper rocker are fixedly connected and are connected with small chain wheels in the centers of the blades through chains. The upper rocker and a lower rocker are transmitted through a short connecting rod and can swing symmetrically. According to the double-wing type power generation device, the rotating angle is matched with the swing control mechanism, and thus the ideal vibration amplitude and rotating angle of the blades can be kept; and meanwhile, favorable interference is produced through symmetric oscillations of double wings, and hence the energy collection efficiency of the device can be improved.

The invention discloses a simultaneous wireless information and energy transmission method based on 5G high and low frequency band. Firstly, a wireless information and energy transmission network based on 5G high and low frequency band is designed, a model of resource allocation in high-low mixing network is established, finally, combined with the optimal matching theory and Lagrange dual decomposition, an optimal algorithm for joint power and channel assignment is designed, the coverage area of the network includes hot spot area and wide area coverage area, users located in the wide area coverage area can only receive information from the base station through the low frequency band, users located in the hot spot area can receive information from the base station through the high frequencyband, and at the same time collect energy through the low frequency band, the energy collected by the equipment in the hot spot area comes from the data signal of users in the wide area coverage area. Compared with the traditional single frequency network, the invention not only can improve the throughput of the cell edge user, but also can improve the energy collection efficiency of the cell center user, and has great advantages in energy collection efficiency and user fairness.

The invention discloses a magnetic coupling multi-beam piezoelectric energy capture device and a bistable realization method thereof. Under the external fundamental excitation, multiple beams can be driven to generate nonlinear vibration, and multi-beam composite piezoelectric power generation is completed. The device comprises an L-shaped cantilever beam piezoelectric vibrator and a linear cantilever beam piezoelectric vibrator, wherein the cantilever beam piezoelectric vibrator is composed of a cantilever beam, a ceramic piezoelectric sheet (or a piezoelectric film), and a permanent magnet,the three beams are respectively connected with a lower beam, the ceramic piezoelectric sheet (or the piezoelectric film) is symmetrically attached to both sides of a cantilever beam support layer, during lateral excitation, the L-shaped cantilever beam piezoelectric vibrator undergoes nonlinear vibration, the permanent magnets located at free ends of the piezoelectric vibrators are subjected to the gravitational force so that the linear cantilever beam piezoelectric vibrator is made to swing left and right to form a bistable system, and the mechanism has a wider vibration frequency band. Thedevice is advantaged in that the device has a simple structure, is easy to implement, can solve broad and low frequency problems in the research of a current piezoelectric energy capture system and meets needs of rapid development of current microelectronic products.

Disclosed is a self-powered bearing health monitoring apparatus. The self-powered bearing health monitoring apparatus comprises a bearing mounted on a shaft; a sensor and data processing transmitting apparatus, a circuit processing apparatus and a plurality of coils are mounted on a bearing retaining frame; magnets are mounted on a bearing end cover; the coils and the magnets are arranged oppositely; the signal output end of the sensor and data processing transmitting apparatus and the input end of an external wireless receiving apparatus are in wireless transmission; the power supply input end of the sensor and data processing transmitting apparatus is connected with the power supply output ends of the coils through the circuit processing apparatus; the coils and the magnets are matched to form a self-powered apparatus; an alternating current voltage generated by the self-powered apparatus is subjected to rectifying and voltage-stabilizing treatment through the circuit processing apparatus to be converted into electric energy for directly supplying power for the sensor and data processing transmitting apparatus; the sensor and data processing transmitting apparatus performs real-time state monitoring on the bearing in the working process and transmits data to the outside wirelessly; and the external wireless receiving apparatus performs real-time monitoring and displaying of the bearing state and carries out fault pre-judgment.

The invention relates to a power generating device, and provides a human gait energy-conversion power generating device which is free of maintenance, is low in cost, is safe and environmentally-friendly, can automatically acquire human gait energy and can convert the human gait energy into current, and provides energy to wearable power consumption equipment. The human gait energy-conversion power generating device comprises a housing, an electromagnetic induction coil arranged in the housing, permanent magnets and a rectifying buffer chip connected with the electromagnetic induction coil; the permanent magnets comprise a positioning permanent magnet and a suspending permanent magnet; a central guide rail is arranged on the housing; the positioning permanent magnet is arranged at the fixed end of the central guide rail in a sleeved mode; the suspending permanent magnet is arranged at the free end of the central guide rail in the sleeved mode; the opposite surfaces of the positioning permanent magnet and the suspending permanent magnet are magnetic surfaces; through the positioning permanent magnet, the suspending permanent magnet is suspended at the free end of the central guide rail; when the suspending permanent magnet has vibration, the suspending permanent magnet can move up and down along the central guide rail; and the suspending permanent magnet is positioned in the electromagnetic induction coil.

The invention provides a bending and torsion composite piezoelectric energy harvester capable of improving energy harvesting capability, belongs to the technical field of water flow and air flow induced vibration energy harvesting and solves the problem that a conventional single piezoelectric cantilever beam is low in energy harvesting efficiency, and the problems that a series-type piezoelectricenergy harvester only perform bending motion, there is no influence relation between the cantilever beams, the series structure occupies large area, and structure stiffness is reduced easily by the series state, which causes structure instability. The technical main points are that a transverse piezoelectric cantilever and a longitudinal piezoelectric cantilever are arranged in a vertically-intersecting manner, achieve linkage through a positioning limiter and can carry out bending and torsion motion at the same time; a pin fin is connected in series with one end of the transverse piezoelectric cantilever, and the series connection direction is same as the water flow and air flow direction; the other end of the transverse piezoelectric cantilever establishes connection with a base througha main clamp; and the longitudinal piezoelectric cantilever establishes connection with the base through an auxiliary clamp. The bending and torsion composite piezoelectric energy harvester can perform bending and torsion motion simultaneously, thereby helping to improve energy harvesting efficiency; and the energy harvester can be widely used for harvesting energy underwater or in the air.

The invention discloses a photovoltaic-piezoelectric-electromagnetic compound type energy harvester. The photovoltaic-piezoelectric-electromagnetic compound type energy harvester comprises a magnet, alow-frequency driving beam and a high-frequency power generation beam, wherein the low-frequency driving beam is used for effectively absorbing vibration energy in a low-frequency vibration environment, and the vibration energy is transmitted to the high-frequency power generation beam which is positioned on one side of the low-frequency driving beam through a collision manner; a photopiezoelectric material for converting vibration into electric energy is arranged on the high-frequency power generation beam; the magnet is fixed to the low-frequency driving beam and faces the high-frequency power generation beam; and the magnet is used for cutting a magnetic induction line under vibratory triggering produced in a surrounding environment so as to produce electric energy and transmitting vibrational excitation. The energy harvester is suitable for being used in illumination and / or vibration environments, and the conversion efficiency and an application range of the energy harvester are improved.

The invention relates to a bistable contactless magnetic vibration energy capture device comprising a plurality of bistable piezoelectric sleeves (1). Each bistable piezoelectric sleeve (1) has two stable states including a raised state and a recessed state; first permanent magnets (4) are arrange on the outer walls of the bistable piezoelectric sleeves (1), and the bistable piezoelectric sleeves (1) are mounted on the outer wall of an inner cylinder (5) in a sleeving manner; a plurality of magnetic sleeves (6) sleeve the bistable piezoelectric sleeves (1), are coaxial with the bistable piezoelectric sleeves (1) and are mounted on the inner wall of an outer cylinder (7); second permanent magnets (8) are embedded in the magnetic sleeves (6), and the pole directions of the second permanent magnets (8) embedded in adjacent magnetic sleeves (6) are opposite. The bistable contactless magnetic vibration energy capture device has the advantages that vibration energy is captured through switching between the recessed stable state and the raised stable state of poles due to vibration of the bistable piezoelectric sleeves, collision and friction energy losses can be eliminated in a contactless mode under the action of magnetic force, and accordingly, energy capture is improved.

The invention provides an omnidirectional-swinging energy capturing and conversing device and a transducer. The device comprises an energy capturing module and an energy conversing module. The energycapturing module is used for decomposing energy of the undirected swinging into energy rotating in two directions. The output end of the energy capturing module is connected with the energy conversingmodule. The energy conversing module comprises a steering speed varying unit, a hydraulic unit and a power generating unit. The invention provides the omnidirectional-swinging energy capturing and conversing device with high energy capturing efficiency, a flexible conversing mode and a flexible structure. The problem of low efficiency in the technical field of energy capturing and conversing equipment in the prior art is solved. Practical and effective solutions are provided for utilization of marine energy and some equipment needing to reduce sloshing amplitude.