175results about How to "Improve energy harvesting efficiency" patented technology

The invention discloses a design method of a combined wing section blade of a horizontal shaft tidal current energy water turbine. The method comprises the steps of researching the hydrodynamic performance of a conventional wing section and the hydrodynamic performance of a bionic wing section separately, combining a conventional blade wing section with the bionic wing section according to the function of all blade elements in the blade, and designing out a combined wing section blade which is superior in performance; obtaining a three-dimensional digital model of a fish fin, selecting section contours of different positions of the fish fin as bionic fish-fin wing sections, selecting a bionic fish-fin wing section through analysis software, exporting the bionic fish-fin wing section and required two-dimensional coordinates of the conventional wing section, optimizing blade elements of the designed blade, obtaining parameters of each blade element, making the bionic wing section and the required conventional wing section correspond to the blade elements, converting the three-dimensional coordinates of the wing section into three-dimensional coordinate data, importing the three-dimensional coordinate data into three-dimensional design software, conducting setting-out treatment, and finally generating the combined wing section blade. By means of the design method, the hydrodynamic performance of the combined wing section blade is made to be superior, and the energy-obtaining efficiency of the water turbine is remarkably improved.

The invention relates to the field of vibration application and electric power technology, and particularly to a right-angled piezoelectric cantilever beam vibration energy harvester. The right-angled piezoelectric cantilever beam vibration energy harvester comprises a supporting base and a horizontal metal substrate which is mounted on the supporting base. The horizontal metal substrate is provided with a piezoelectric ceramic wafer at the end which is next to the supporting base. A vertical metal substrate is adhered to the other end of the horizontal metal substrate. The horizontal metal substrate is perpendicular with a vertical metal substrate, thereby forming a right-angled cantilever beam structure. The other end of the vertical metal substrate is provided with a mass block. According to the right-angled piezoelectric cantilever beam vibration energy harvester, the right-angled cantilever beam is formed through adding an auxiliary cantilever beam at the end of the horizontal cantilever beam. Through controlling the structural dimensions of the horizontal cantilever beam and the vertical cantilever beam and the mass of the mass block, controlling for an interval between two front stages of modal frequencies is realized, thereby forming a relatively wide operation frequency band and realizing high-efficiency acquisition and conversion for environment vibration energy.

The invention discloses a retractable blade vertical-axis tidal turbine, which comprises a rotating shaft, a turntable, blades, retractable support arms, eight guide rails, guide rail wheels, baffle plates, a controller and a support part, wherein the guide rails are positioned in the turntable, and are divided into two layers, and each layer comprises four guide rails; the guide rails are uniformly welded on the rotating shaft at intervals of 90 degrees; the guide rail wheels are mounted on the inner surfaces of the guide rails; a retractable support arm is mounted in each guide rail; the support arms are retractably and movably connected with the guide rails through the guide rail wheels; the blades are mounted at the ends, far away from the turntable, of the support arms; the blades are rectangular, and are positioned on the same planes as the upper and lower layers of retractable support arms; the baffle plates are fixedly mounted at the ends, far away from the turntable, of the blades, and are in right-angled connection with the blades; the blades slide in the guide rails through the retractable support arms, and are controlled by the controller to retractably move. According to the retractable blade vertical-axis tidal turbine with such a retractable design, the energy yielding efficiency of the vertical-axis turbine is improved, the size of the whole device is reduced, convenience in transportation and considerable market prospect are achieved, and the submarine mounting cost is reduced.

The invention discloses a sitting posture detection seat based on piezoelectric power generation and power generation and detection methods thereof. At present, power generation seats in the market generally use photovoltaic power generation or electromagnetic power generation methods, but the methods have certain limitations. The sitting posture detecting seat based on the piezoelectric power generation comprises a seat main body and an energy collecting mechanism. The energy collecting mechanism comprises a base and oscillating power generation units. The base is fixed in the seat main body.M placement grooves are formed in the outer side surface of the base, wherein m is less than or equal to 100. One oscillating power generation unit is arranged in each placement groove. Each oscillating power generation unit comprises a force receiving plate, a first spring, a vibrator mass block, a second spring and a piezoelectric assembly. Each piezoelectric assembly comprises a piezoelectricsheet, a top arch-shaped stretching plate, a bottom arch-shaped stretching plate and a flexible sheet. By means of a spring system, instantaneous acting force on the seat when a human body sits down or leans back is converted into elastic potential energy of the springs, so that the energy storage function is achieved and continuous power generation is realized.

The present invention discloses a piezoelectric-electromagnetic hybrid MEMS vibration energy collector and a preparation method thereof. A movable permanent magnet is used as a pick-up structure. Under the effect of a vibration environment, the movable permanent magnet moves in a cavity, thus the magnetic flux in a spiral inductance coil is changed, induction current is generated in a closed loop formed by the spiral inductance coil and an external load, and the conversion of vibrational energy into electrical energy through an electromagnetic induction mode is realized. In addition, when the movable permanent magnet moves in the cavity, the generated pressure or impact causes the bending deformation of a first square film or a second square film, the deformation of a piezoelectric layer is caused to generate piezoelectric voltage, the conversion of the vibrational energy into the electrical energy through a piezoelectric effect is realized, and the piezoelectric electrode of the piezoelectric layer is connected to supply power to the load. According to the piezoelectric-electromagnetic hybrid MEMS vibration energy collector and the preparation method, the modes of electromagnetic induction and piezoelectric effect are combined to convert the vibrational energy into the electrical energy, and the electromagnetic induction and the piezoelectric effect are superimposed to supply power to the load.

The invention relates to a ferromagnetic-coupling vibration energy collection device with double cantilever beams. The structure of the ferromagnetic-coupling vibration energy collection device comprises a vibration structure, an external framework, a fastening piece, an upper cantilever beam, an upper piezoelectric material block, a mass block, an upper cantilever beam ferromagnetic block, a lower cantilever beam, a lower piezoelectric material block and a lower cantilever beam ferromagnetic block. The ferromagnetic-coupling vibration energy collection device has the effect that the double cantilever beams are used as a basic energy collection structure; compared with the other methods, the structure is simple to arrange and design and is easy to fabricate and maintain; the two cantileverbeams are arranged to collect energy, the resonant frequencies of the two cantilever beams can be different by attaching the mass block onto the upper cantilever beam, so that the beneficial effect of multi-resonant frequency bands is achieved; a non-linear force is introduced by ferromagnetic coupling; and compared with the same-size cantilever beam without ferromagnet, the ferromagnetic-coupling vibration energy collection device has the advantages that the energy collection efficiency is greatly improved, the bandwidth is greatly expanded, the broadening frequencies of the two cantilever beams can be coincided, so that the output is improved to be applicable to a more complicated working condition.

The invention relates to an energy acquisition method for simultaneous transmission of wireless information and energy in a heterogeneous small cellular network, belonging to the network power controlfield. The invention provides a power allocation algorithm based on SWIPT-HCN, which optimizes the beamforming matrix and power splitting coefficient (or time switching factor) of a base station jointly, thereby maximizing the system energy collection efficiency. Then the semi-definite relaxation SDR is used to convert the original problem into a convex optimization problem, which is solved by continuous convex approximation SCA algorithm. The results obtained by the invention show that under different signal-to-noise ratio SINR, energy acquisition threshold and macro-user MU interference threshold, the proposed method significantly improves the system energy acquisition efficiency.

The invention relates to a swing-type friction nano-generator and an energy harvester. The swing-type friction nano-generator comprises a housing, a swing structure, an electrode layer and a distributed friction layer, wherein the housing is of a closed housing structure and is internally provided with a cavity; the swing structure is positioned in the cavity and comprises a swing rod and a free swing friction layer which is rigidly connected with the tail end of the swing rod; the electrode layer is located on an inner surface of the housing and comprises a first electrode layer and a secondelectrode layer which are spaced apart from each other; the material of the distributed friction layer and the material of the free swing friction layer are located in different triboelectric sequences, one end of the distribution friction layer is fixed on the electrode layer, and the other end is a free end; and when the swing structure swings in the housing due to external excitation, the freeswing friction layer of the swing structure swings along with the swing structure, and electrical output is correspondingly generated on the electrode layer through friction electrification between the free swing friction layer of the swing structure and the distributed friction layer. The swing-type friction nano-generator has high energy collection efficiency, can adapt to various environments,has high stability and reliability, can respond to external excitation at any angle, and has a wide application prospect.

The invention provides an oscillating airfoil generation device provided with turning angle amplifiers. The oscillating airfoil generation device comprises two vertical supports, a blade, the two turning angle amplifiers, two connecting rods, a crank and a generator, wherein each vertical support is provided with a sliding rail; a slider sheathes each sliding rail; the end part of each slider is fixedly connected with a mounting rack of the corresponding turning angle amplifier; the mounting rack of the turning angle amplifier is provided with a pinion shaft, a reversing gear shaft and a large gear shaft; a pinion, a reversing gear and a large gear respectively sheathe each pinion shaft, each reversing gear shaft and each large gear shaft; the spindle of the blade penetrates through end part baffles and is fixedly connected with the two pinion shafts; one end of each of the two connecting rods is arranged on the corresponding large gear; the other end of each of the two connecting rods is pivoted with the corresponding crank; two ends of the crank are respectively provided with an inertia wheel, and one of the two ends of the crank are connected with the generator. According to the oscillating airfoil generation device provided by the invention, the blade can keep a comparatively ideal attack angle range within determined vibration amplitude, so that the energy collection efficiency is greatly increased.

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 symmetrical semi-shading type tidal current energy generation device. The generation device is composed of a semi-shading device, a generation device body and telescopic pile legs. A current guide part of the semi-shading device is provided with a special shaped line design. The whole device is fixed to the seabed through the telescopic pile legs after sinking to the appropriate depth. The upper portion of the semi-shading device is provided with a cuboid-shaped motor protective cover. A change speed gear box and a generator are arranged inside the protective cover. The generation device body comprises vertical axis water turbines comprising flap type composite blades, the change speed gear box and a generator set, wherein the axis centers of the flap type vertical axis water turbines are arranged into a line on a straight line, and one bilateral type semi-shading device is installed between every two flap type vertical axis water turbines. Through two vertical impellers and the symmetrical distribution of shading current guide shells of the two vertical impellers, the conflux effect is strengthened, and the utilization ratio of tidal current energy is improved. Modularized manufacturing and lateral spreading are facilitated through the symmetrical semi-shading type tidal current energy generation device, therefore, the generation device can be installed and applied in a wide water area in an array mode, and accordingly large-scale power generating through the tidal current energy is achieved.

The invention relates to a flapping-wing energy-acquiring device of self-moving flaps comprising an energy-acquiring part, flapping wings and a main shaft, wherein the two flapping wings are connected to each other by the main shaft to form a whole; the main shaft of the two flapping wings is positioned through the middle of the energy-acquiring part; the two flapping wings can rotate around the main shaft and the whole can make a heaving motion in a vertical direction; and the energy-acquiring part acquires the energy transmitted by the flapping wings by the movement of the main shaft. The Gurney flaps are applied in the flapping-wing energy-acquiring device of the self-moving flaps. According to Archimedes' principle, the Gurney flaps are designed to be arranged at the trailing edge of airfoils to automatically change the direction based on different directions of the heaving motion, which is equivalent to increasing the camber of the airfoils, thereby increasing the lift coefficient of the airfoils and the energy-acquiring efficiency of the flapping wings. The flapping-wing energy-acquiring device of the self-moving flaps is simple in structure, and automatically realizes the direction changing of the self-moving flaps on the surface of the airfoils based on the different directions of the heaving motion by using Archimedes' principle.

The invention discloses an energy collection device based on piezoelectric power generation and a control system and a control method thereof. The energy collection device comprises a power generation device, an energy conversion module, and a storage device. The power generation device comprises a cover plate, an impact block, fixed columns, a piezoelectric dual-chip array, a base plate, and a wire. The energy conversion module is connected with the storage device through a doubling rectifier circuit. The storage device is connected in parallel with a voltage regulator diode through a super capacitor. The invention provides an efficient energy collection device, and automatic energy collection is realized through a control system.

The invention provides a piezoelectric-electromagnetic hybrid vibration energy collector and a preparation method thereof. The vibration energy collector comprises a first substrate, a second substrate and a third substrate, wherein the first substrate, the second substrate and the third substrate are stacked on each other. The first substrate and the third substrate are etched to form first and second cantilever structures respectively. A first groove is formed on the lower surface of the first substrate. The first cantilever structure is above the first groove. A second groove is formed on the upper surface of the third substrate. The second cantilever structure is below the second groove. The third groove and the fourth groove are formed at corresponding positions on upper and lower surfaces of the second substrate, and three groups of vibration pickup structures with different resonant frequencies are assembled. The vibration energy collector prepared by the preparation method hasthe advantages of high energy collection efficiency, output power and output power density (W/cm<2>), small size, high precision, easy mass production, low manufacturing cost and easy miniaturization..

The invention relates to a crank and connecting rod type electromagnetic piezoelectric composite energy collecting device. The crank and connecting rod type electromagnetic piezoelectric composite energy collecting device comprises a bottom disc, a crank, connecting rod and slide block mechanism, a rotary input mechanism and an electromagnetic piezoelectric mechanism, wherein four slide grooves or more are arranged at one side surface of the bottom disc in a radial way, and one end of the four slide grooves or more is gathered at the center of the bottom disc; the crank, connecting rod and slide block mechanism comprises a crank, four connecting rods or more and slide blocks, and the slide blocks are respectively and correspondingly positioned in four slide grooves or more; the rotary input mechanism is positioned at the other side surface of the bottom disc, and is a mass swing rod mechanism or a rotary wheel mechanism; the electromagnetic piezoelectric mechanism comprises four piezoelectric bimorph beam mechanisms or more, four magnets or more and coils, and the coils are uniformly arranged at both sides of each slide groove. The crank and connecting rod type electromagnetic piezoelectric composite energy collecting device has the advantages that under the action of outside excitation, the rotary input mechanism is used for driving the magnets to do reciprocating movement in the slide grooves, and the multiple coils can produce and output sensing current; the piezoelectric bimorph beam mechanisms can generate larger vibration and bending deformation, and produce and output charges.