795 results about "Cantilevered beam" 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 low-power-consumption photonic integrated device preparation method and a corresponding device, and relates to the technical field of semiconductor optoelectronic integrated devices.The device comprises a substrate, a cantilever beam type grating layer, two gain layers, two modulator layers, a wrapping layer and an electric contact layer, the two gain layers and the two modulator layers are symmetrically distributed, and the wrapping layer and the electric contact layer form a shallow ridge waveguide structure. The two symmetrically-distributed gain layers and the middle cantilever beam type grating layer jointly form a double-end resonant cavity structure, the structure shares a unified grating and a thermal tuning platform to achieve continuous, synchronous and high-precision control over cavity mode wavelengths, and balanced modulation and phase synchronization of double-end output are achieved in cooperation with the symmetrically-integrated high-speed modulator layers on the two sides. According to the technical scheme, the gain layer, the grating layer and the modulator layer are symmetrically integrated on the same substrate, the alignment error of a multi-cavity structure is reduced, synchronous scanning, low drift and strong anti-interference high-quality laser output can be obtained, meanwhile, efficient thermal tuning is conducted through the cantilever beam type grating layer, and power consumption is remarkably reduced.

The invention relates to the technical field of soil pressure sensors, and discloses a lever structure-based soil pressure sensor, which comprises a shell, a bearing plate, a constant-strength cantilever beam, a force transmission lever and a measurement optical fiber, and is characterized in that the shell is internally provided with a containing cavity with an upward opening, the bearing plate is arranged at the top of the shell, and one end of the constant-strength cantilever beam is arranged on the side wall of the containing cavity; the force transmission lever is rotationally arranged in the accommodating cavity, and the measuring optical fiber is arranged at the bottom of the equal-strength cantilever beam; the equal-strength cantilever beam guarantees equal strain in the axial direction, micro deformation of the force bearing plate is amplified and transmitted to the equal-strength cantilever beam through the force transmission lever, deformation is converted into optical signals through the measuring optical fiber, and an anti-electromagnetic interference optical fiber measuring mode and an external collecting and demodulating technology are combined. Not only is small-size design and high sensitivity realized, but also interference on the original structure and stress distribution of the soil body is reduced, and the measurement precision in a complex rock-soil environment is improved.

The present application discloses a method for measuring impact force of debris flow and application, and a design method for barrier energy dissipation pile array. The method for measuring vertical impact force of debris flow measures the tangential velocity of debris flow at the impact point to measure the vertical impact force distribution of debris flow on the impact point. Further, the design method for pile array simplifies the free section of energy dissipation pile as a cantilever beam, which generates a bending resistance when impacted by debris flow, and the bending resistance continuously works to dissipate the impact kinetic energy of debris flow. According to the motion characteristics of debris flow, the impact time and distance parameters are further derived to solve the problems of measuring and designing the stability parameters of single energy dissipation pile, the energy dissipation parameters of barrier energy dissipation pile array, and the number parameters of barrier energy dissipation pile array. The present application also provides the application of each measuring and designing method. The present application provides a more scientific and perfect solution for the energy dissipation design of barrier energy dissipation pile array to resist the impact damage of rockfall and debris flow caused by landslide disaster.

The invention discloses a piezoelectric air cooling device based on a piezoelectric film PZT technology, and relates to the technical field of MEMS. The device adopts a two-layer packaging structure of a piezoelectric cantilever beam MEMS chip and a PCB (Printed Circuit Board) with a vent hole. A cantilever beam of the MEMS chip is integrated with an SOI top silicon layer and an ultrathin PZT driving stack, low rigidity and high driving force are achieved, and the surface of the cantilever beam is covered with a PDMS flexible sealing layer to achieve dynamic sealing. When the device works, the cantilever beam is driven to resonate in an ultrasonic frequency band, and efficient synthetic jet is generated at the vent hole by periodically changing the volume of the pump cavity. The technical bottleneck that miniaturization and high performance are difficult to consider at the same time is broken through, and the device has the advantages of being compact in structure, mute and efficient and is suitable for precise heat dissipation of miniature electronic equipment.

The invention discloses a piezoelectric cantilever beam energy collector, and the collector comprises a fixed part 1 which is used for fixing the collector at a certain position; the supporting beam and the fixing piece 1 are connected into a whole, the supporting beam comprises a bionic bamboo joint structure 2 close to one end of the fixing piece 1 and a mass structure 3 far away from one end of the fixing piece 1, and at least one micropore 6 penetrating through the upper surface and the lower surface of the supporting beam is formed in the bionic bamboo joint structure 2 and used for forming alternate rigid segments and flexible nodes on the bionic bamboo joint structure 2; the supporting beam swings with the end close to the fixing piece 1 as the circle center in the vibration environment. The mass block 5 is arranged on the mass structure 3; the number of the piezoelectric films 4 is two, the two piezoelectric films 4 are arranged on the upper surface and the lower surface of the bionic bamboo joint structure 2 respectively, and the piezoelectric films 4 cover the micropores 6 formed in the bionic bamboo joint structure 2.

The invention discloses a preparation technology for preparing a high-strength PP composite material based on waste plastic regeneration, and belongs to the technical field of regenerated PP composite materials. Cleaning and crushing the separated polypropylene plastic, adding the crushed polypropylene plastic, the maleic anhydride grafted polypropylene, the composite flame-retardant powder, the reinforcing agent, the modified organic silicon resin and the antioxidant 1010 into an internal mixer, carrying out melt blending, and discharging to obtain the high-strength polypropylene composite material. The polypropylene fragments, the composite flame-retardant powder, the reinforcing agent and the modified organic silicon resin are subjected to melt blending, so that the flame retardance, the oxidation resistance, the tensile strength and the cantilever beam notch impact strength of the regenerated polypropylene are further improved.

The invention relates to a dot matrix cell element filling structure design method considering a material shearing effect, which comprises the following steps: acquiring a plurality of dot matrix cell elements, and extracting configuration data of each dot matrix cell element; training a U-Net neural network by using the configuration data to obtain a dot matrix cell element configuration reverse generation model; establishing a cantilever beam flexibility minimization objective function considering the shear modulus, and adopting a variable density topology to optimize a cantilever beam example to generate a global stiffness matrix of the shear modulus containing dot matrix cell elements; and performing reverse mapping on the global stiffness matrix by using the dot matrix cell configuration reverse generation model to obtain the cell configuration of the dot matrix cell filling structure. According to the method, the dot matrix filling structure design capable of considering the cell shear modulus distribution is realized.

The invention discloses a preparation method and structure of a photon integrated laser, and the method comprises the steps: dividing a device into seven functional regions, including two modulator regions, two gain regions, two front grating regions and a common rear grating region; an active material of a modulator region and a passive material of a grating region are respectively formed through two times of butt-joint growth; after sampling gratings are manufactured in the front grating area and the rear grating area, a cladding layer, a contact layer and a ridge waveguide structure grow, cantilever beam heat insulation structures are formed on the two sides of the ridge waveguide of the shared grating area, and finally electrodes of the rear functional areas are manufactured. Wavelength tuning of the two lasers is achieved by sharing the rear grating area, and the size of the lasers is effectively reduced; the cantilever beam structure of the rear grating area is utilized to effectively reduce heat conduction, improve wavelength tuning efficiency and reduce power consumption; through the double-end integrated electro-absorption modulator, bidirectional light emission of a single integrated chip is realized, signal modulation of different bidirectional light emission wavelengths can be carried out, and the utilization rate of optical fiber transmission is improved.

The invention discloses an underwater permanent magnet-electromechanical power generation device based on wave current driving. The underwater permanent magnet-electromechanical power generation device comprises a closed shell, an elastic supporting piece, an energy excitation assembly, a rotating rod mechanism and a piezoelectric cantilever beam array. The sealing shell is arranged on the seabed or an existing foundation through an elastic supporting piece. The energy excitation assembly comprises an upper track plate and a lower track plate which are transversely arranged, the upper track plate and the lower track plate are erected on the main shaft rod in an up-down spaced mode, an upper annular track groove is formed in the lower side of the upper track plate, and an upper annular track groove is formed in the upper side of the lower track plate. The small ball is arranged in a space surrounded by the lower annular track groove and the upper annular track groove and can roll along the track grooves; the rotating rod is connected to the main shaft rod in a swinging mode and located between the upper track plate and the lower track plate. The piezoelectric cantilever array comprises piezoelectric cantilever beams surrounding the periphery of the circumferential rotation track of the rotating rod, and piezoelectric patches are arranged on the piezoelectric cantilever beams. The device can absorb kinetic energy generated by low-frequency and multi-source vibration and convert the kinetic energy into electric energy through piezoelectricity, so that power is conveniently supplied to underwater equipment.

The application provides a multi-wire submerged arc welding method and device for straight-seam steel pipes, and belongs to the technical field of welding. The method comprises the following steps: adopting a multi-wire submerged arc welding process to perform double-sided submerged arc welding on a straight-seam steel pipe, and when welding an outer weld, an ultrasonic auxiliary device arranged at the back of a molten pool generates ultrasonic waves and inputs the ultrasonic waves into the molten pool through a horn, so that the formation of intergranular ferrite in the weld zone is inhibited, the content of intragranular acicular ferrite is increased, and the toughness and hydrogen brittleness resistance of the weld zone are improved. The device comprises a three-wire submerged arc welding device, an ultrasonic auxiliary device and a telescopic cantilever beam; the ultrasonic auxiliary device is installed at the front end of the telescopic cantilever beam and comprises three ultrasonic transducers arranged side by side; a horn is installed at the output end of the ultrasonic transducer; the ultrasonic transducer generates ultrasonic waves and inputs the ultrasonic waves into the molten pool through the horn. The application solves the problems that the existing ultrasonic auxiliary arc welding cannot control the content of acicular ferrite and the effect of reducing residual stress in the weld zone is not obvious.

The invention discloses a wavelength thermal tuning photon integrated device and a preparation method thereof.The device comprises a substrate, a modulator layer, a front sampling grating layer, a gain layer, a rear sampling grating layer, a cover layer and an electric contact layer, the cover layer and the electric contact layer jointly form a shallow ridge waveguide structure, and the shallow ridge waveguide structure is transversely arranged in the center of the upper portion of each functional layer; the whole cover layer and the electric contact layer are etched according to a preset ridge-shaped strip pattern, a cantilever beam structure is transversely arranged in the post-sampling grating layer, the cantilever beam structure comprises a cantilever beam and air grooves in the two sides of the cantilever beam, and the cantilever beam is located under the shallow ridge waveguide structure; the cantilever beam structure is formed by etching the rear sampling grating layer below the shallow ridge waveguide structure according to a preset cantilever strip pattern; according to the technical scheme, wavelength thermal tuning is achieved through collaborative design of the shallow ridge waveguide structure and the cantilever beam grating structure, limitation of material carrier concentration is avoided, thermal response is fast, and power consumption is remarkably reduced.

The invention belongs to the technical field of wind turbine generator operation and maintenance, and particularly relates to a wind turbine generator vibration detection device which comprises a base. A vibration detection unit including a vibration sensor; the energy collecting part comprises a multi-order cantilever beam array and an energy storage capacitor, and a piezoelectric plate is arranged on the multi-order cantilever beam array and used for converting mechanical vibration energy into electric energy; the rectifying part is used for converting the alternating current output by the piezoelectric plate into one-way current; through the integrated design of broadband energy harvesting, mechanical rectification and self-energized monitoring, full-scene vibration detection of key components of the wind turbine generator is realized, and the problems that an existing device is dependent on power supply, narrow in frequency band adaptation and poor in reliability in a severe environment are solved. Vibration detection, energy collection and rectification are highly coordinated in spatial layout, mechanical transmission and energy flow direction, and are physically isolated from a power supply circuit, so that the performance is improved, mutual interference is avoided, and real high-integration and high-reliability self-energized detection is realized.

A measurement system includes: a first laser device for outputting a pump light as a pulse laser in response to an input first signal; a second laser device for outputting a probe light as a pulse laser in response to an input second signal; a trigger generator and delay time controller for inputting the first signal and the second signal to the first laser and the second laser, repeatedly inputting the first signal and the second signal by switching a variable delay value which is a difference between a timing of inputting the first signal to the first laser and a timing of inputting the second signal to the second laser in a plurality of ways, and outputting a reference signal to a lock-in amplifier when switching the variable delay value; an auxiliary optical system for guiding the pump light and the probe light to sample; a cantilever having an probe tip disposed proximate to the sample; and a controller for applying a periodically varying voltage to the cantilever and outputting a change amount signal which is a voltage or a current corresponding to a change in the resonance frequency of the cantilever, wherein the lock-in amplifier measures the change amount signal based on reference signal.

Each receptacle contact includes a soldering part to be soldered to a connector mounting surface of a board, a fixed part to be fixed to a receptacle housing, and a spring part supported like a cantilever beam by the fixed part and elastically deformable in this recited order. The spring part includes a first contact part configured to come into contact with a plug connector. The plurality of receptacle contacts include a signal contact and a ground contact adjacent to each other. A spring part of the signal contacts and a spring part of the ground contact are elastically deformable independently of each other. The spring part of the ground contact further includes a second contact part that comes into contact with the ground plate when the connectors mate.

The invention discloses a non-Hermite elastic system and application thereof. The system comprises a first resonator, a second resonator and a coupling module. The coupling module is composed of a sensing-actuating feedback system and comprises a first sensor and a first actuator which are arranged on a first resonator, and a second sensor and a second actuator which are arranged on a second resonator. And the sensors are used for detecting the deformation of the corresponding resonators. The actuators are used for driving the corresponding resonators to deform. Excitation signals of the first actuator and the second actuator are obtained by multiplying sensing signals of the first sensor and the second sensor by a transfer function. The transfer function makes the two natural frequencies of the non-Hermi elastic system tend to be consistent near a singular point. The bifurcation value of the inherent frequency of the system near the singular point is very sensitive to the parameter change of the system, so that the cantilever beam mass measurement device and the crack propagation detection device with ultrahigh sensitivity can be obtained.

The invention provides an MEMS heart sound and electrocardio detection system, method and equipment, and relates to the technical field of medical instruments, the MEMS heart sound and electrocardio detection system comprises a bionic cilium heart sound sensor, an electrocardio acquisition circuit and a signal fusion model; the bionic cilia heart sound sensor comprises hollow bullet type bionic cilia and a cantilever beam microstructure; the hollow bullet type bionic cilia and the cantilever beam microstructure are mechanically coupled, and the cantilever beam microstructure comprises a Wheatstone bridge formed by arranging a plurality of piezoresistors and is used for collecting heart sound signals; the electrocardio acquisition circuit and the bionic cilium heart sound sensor are packaged in an acoustic impedance matching mode, and the electrocardio acquisition circuit comprises an electrocardio acquisition electrode plate, a power supply voltage stabilization module, an instrument amplification module, a band-pass filtering module and a notch filter and is used for acquiring and conditioning electrocardio signals; the signal fusion model comprises a Resnet18 feature extractor, an encoder and a mutual cross attention mechanism, and is used for performing feature extraction, linear transformation and feature deep fusion on the collected electrocardiosignals and electrocardiosignals and outputting a signal classification result.

The invention relates to the technical field of optical fiber gas sensing, and provides an optical fiber photoacoustic sensor based on a nested cantilever beam structure and a sensing system.The optical fiber photoacoustic sensor comprises an optical fiber collimator, a shell, a cantilever beam diaphragm and a ceramic contact pin; the optical fiber collimator is inserted into the shell from one side of the shell; the ceramic pin is inserted into the shell from the bottom of the shell; an air chamber is arranged in the shell, and an air inlet and an air outlet which are communicated with the air chamber are reserved in the shell; a cantilever beam diaphragm is arranged on the shell; a plurality of layers of nested cantilever beams are arranged on the cantilever beam membrane; the lengths and the widths of the cantilever beams are sequentially reduced from outside to inside; and the resonant frequencies of the cantilever beams are different. According to the invention, multiple gases can be detected in the same equipment at the same time, the detection efficiency is improved, and the equipment volume is reduced.

The invention discloses a double-cantilever-beam piezoelectric vibration energy collector based on an annular steady state, which comprises a piezoelectric transducer, an elastic cantilever beam, a magnet and a base, after the piezoelectric transducer is mounted on the elastic cantilever beam to form a double-layer composite cantilever beam, the magnet is mounted at the free end of the double-layer composite cantilever beam, nonlinear coupling is carried out through repulsive magnetic force, and the piezoelectric transducer is connected with the base. The two-dimensional annular potential well structure with the adjustable potential well is formed, and the energy collector can easily trigger large-amplitude inter-well movement through the potential well structure. Through the nonlinear coupling induced internal resonance effect, inter-well energy transfer and two-dimensional potential well modulation are realized, and vibration energy can be efficiently captured in a broadband without a large amount of energy input or a complex structure. According to the design, the collection efficiency of low-frequency, low-intensity and multi-direction environment vibration energy in a wide working bandwidth is good.

The invention provides an automatic detection feeding device suitable for a thin-wall short pipe. The automatic detection feeding device comprises a workbench, and a feeding mechanism, a detection mechanism and a conveying mechanism are arranged on the workbench; the feeding mechanism comprises a storage frame, a discharging mechanism and a lifting mechanism, wherein the storage frame, the discharging mechanism and the lifting mechanism are located above the workbench. The lifting mechanism is provided with a first sensor used for detecting whether a pipe exists or not. The discharging mechanism is provided with a second sensor used for detecting the position state of the pipe. The detection mechanism comprises a guide rail installed on the workbench, a driving device is arranged at one end of the guide rail, and a measuring instrument used for measuring the size of a pipe is installed on the rotating platform. The feeding mechanism comprises at least one supporting pile vertically installed on the workbench, at least one clamping mechanism used for clamping pipes is borne below the cantilever beam, the feeding device can meet different detection requirements, and the detection work efficiency and the accuracy of detection results are improved.

The invention discloses a double-support rotary full-bore throttle valve and a station switching method. Through the core assembly composed of the actuator, the valve rod, the rotary valve element, the double-end bearing supports and the like, a stress model is optimized into a stable simply supported beam structure from a traditional cantilever beam structure, vibration caused by fluid impact is remarkably restrained, and the operation stability of the whole machine is enhanced. The rotary valve core is integrated with a variable-cross-section throttling molded surface, a large-diameter full-bore flow channel and a cut-off molded surface, so that the equipment not only can realize continuous adjustment of flow and pressure, but also can perform on-line blockage removal and pollution discharge by rotating and switching to a full-bore state under the condition of not closing an upstream valve and a downstream valve, and the maintenance process is greatly simplified. In addition, according to the design, the axial telescopic space is omitted through the rotary motion principle, a valve element sleeve protection structure is omitted through high stability, the equipment size and material consumption are effectively reduced, and the beneficial effects of being high in function integration degree, high in erosion resistance, long in service life and the like are achieved.

The invention relates to the technical field of energy collection systems, and discloses a combined low-frequency vibration energy collector which comprises a lower-layer structure and an upper-layer structure which are combined to form an upper-layer and lower-layer coupled structure. The lower layer structure is an arc-shaped flexible beam, and the arc-shaped flexible beam is used for collecting piezoelectric energy generated by bending deformation; the upper layer structure is a T-shaped cantilever beam, the T-shaped cantilever beam is used for responding to bending modes in different directions and realizing multi-point energy collection, and the energy collection efficiency is improved by introducing mass load to regulate and control structural dynamic behaviors; the first end of the arc-shaped flexible beam is used for being fixed to the edge of a base to conduct energy conversion, the second end of the arc-shaped flexible beam supports the upper layer structure through the first mass block and is combined to form an integrally-connected composite vibration system used for transmitting inertial response, and the first mass block is used for adjusting the inherent frequency to be matched with a low-frequency vibration source.

The invention discloses a sensing unit structure of a piezoelectric-piezoresistive coupling type electric field sensor and application, the sensing unit structure comprises a substrate, the substrate is provided with a cantilever beam structure, a piezoelectric crystal block is bonded between the lower surface of the cantilever beam structure and the upper surface of the substrate, and the upper surface of the cantilever beam structure is provided with a Wheatstone full-bridge structure; when the piezoelectric crystal block is subjected to the action of an electric field, the piezoelectric crystal block deforms in the Z-axis direction under the action of an inverse piezoelectric effect, so that the cantilever beam structure deforms; in the Wheatstone full-bridge structure, the resistors arranged at the position with the maximum stress difference value are stressed to deform, the stress directions of the resistors are opposite, and the resistance values of the resistors are changed oppositely; compared with the sensing unit structures of electro-optical and mechanical electric field sensors commonly used at present, the sensing unit structure has the advantages of larger measuring range, smaller volume, lower power consumption and easiness in mass production.

The invention discloses a resin alloy material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The resin alloy material comprises the following components: PET (Polyethylene Terephthalate) resin, PP (Polypropylene) resin and a compatilizer, the melting point of the PET resin is less than or equal to 200 DEG C; the cantilever beam notch impact strength of the PP resin is greater than or equal to 400J / m; the compatilizer comprises at least two of PP (Polypropylene) grafted maleic anhydride, POE (Polyolefin Elastomer) grafted maleic anhydride, POE grafted GMA (Glycidyl Methacrylate) and SEBS (Styrene-Ethylene-Butylene-Styrene) grafted maleic anhydride. According to the resin alloy material, through compounding of specific components, the mechanical strength of the resin alloy material is guaranteed, meanwhile, the shrinkage rate is reduced, the compatibility problem of PET and PP is solved, rigid-tough balance is achieved, a workpiece prepared from the obtained resin alloy material is not prone to being broken, the strength is high, and the resin alloy material is suitable for being used in the field of household appliance products and has wide application prospects. The method is especially suitable for preparing household appliance shells.

The invention discloses an equivalence evaluation method for testing the fracture behavior of an irradiation metal material based on a small sample, belongs to the field of mechanical property testing, and deeply researches the size effect problems of non-uniform deformation and crack initiation of the metal material under the irradiation condition through three research means of experiments, theories and simulation. And a powerful basis is provided for performance evaluation of the metal material under the irradiation condition. In the aspect of experiments, micro-stretching and micro-cantilever beam experiments of samples with different sizes under irradiation conditions are carried out, and a correlation mechanism between irradiation material crack initiation and sample sizes is analyzed. On the theoretical aspect, a dislocation channel-grain boundary interaction model is established, and prediction of fracture toughness of irradiation samples of different sizes is achieved. In the aspect of simulation, a finite element simulation system for non-uniform deformation, crack initiation and size effect of the metal material under the irradiation condition is established, and the influence of irradiation and sample size on microstructure evolution and macroscopic fracture behavior of the material is explored.

The invention discloses a piezoelectric-triboelectric hybrid power generation device and method based on flow-induced shaking, the device comprises a flow-induced shaking module, the flow-induced shaking module comprises a base, a rotating rod capable of rotating along the base is arranged on the base, a cantilever beam is arranged on the rotating rod, the inner end of the cantilever beam is arranged on the rotating rod, and the outer end of the cantilever beam is arranged on the base. The cantilever beam is provided with a piezoelectric module, the piezoelectric module comprises a piezoelectric plate, and the piezoelectric plate is connected with a first collection circuit; a solid-liquid friction nanometer power generation module is arranged at the outer end of the cantilever beam, the solid-liquid friction nanometer power generation module comprises a container, friction liquid, a friction layer and an electrode are arranged in the container, and the electrode is connected with a second collection circuit.

The invention relates to the technical field of metal material performance testing, and particularly discloses a metal material tensile property testing method and device of a small-size cantilever beam, and the testing method comprises the following steps: preparing a cantilever beam sample; installing and loading; and calculating parameters. The test device comprises a clamping seat provided with a clamping groove used for restraining a cantilever beam sample; the cover plate is connected to the clamping seat through a fastener so as to press and fix the cantilever beam sample on the clamping seat; the upper pressure head is used for applying quasi-static displacement loading to the cantilever beam sample; and the distance between the central point of the upper pressure head and the clamping end of the clamping seat is an effective span and is three times of the width B of the cantilever beam sample. Therefore, the problems that in the prior art, performance parameters obtained through small-size cantilever beam testing are single, and the requirement of engineering practice for multi-parameter collaborative evaluation is difficult to meet are solved, meanwhile, the method can be suitable for system testing of small-size cantilever beam samples, and the stability and accuracy of testing results are improved.

The invention relates to a cantilever beam for a piezoelectric energy harvesting system, wherein the cantilever beam (2, 20, 30) comprises two layers (21, 22, 31, 32) of polyvinylidene fluoride, and wherein a core layer (23, 33) of a gasket material is sandwiched between the two layers (21, 22, 31, 32) of polyvinylidene fluoride.

The invention relates to a multi-physical mechanism synergistic light sound absorption and insulation integrated sandwich structure and a manufacturing method thereof.The multi-physical mechanism synergistic light sound absorption and insulation integrated sandwich structure comprises a panel, a sandwich layer and a micro-perforated panel which are arranged from top to bottom, a cavity is formed in the sandwich layer, and multiple sets of cantilever beam type harmonic oscillators arranged in an array are arranged in the cavity; the cantilever beam type harmonic oscillator comprises a cantilever beam base body and a metal rubber mass block fixed at the top end of the cantilever beam base body. According to the invention, through the coupling design of the micro-perforated plate and the internal grating cavity of the sandwich layer, the sound absorption frequency band is further widened, the sound absorption coefficient of the whole structure in a middle-high frequency band is improved, collaborative optimization of broadband sound absorption and low-frequency sound insulation is realized, the problem that a traditional harmonic oscillator is easy to lose efficacy in high-temperature and low-temperature environments is effectively solved, and the sound absorption efficiency is improved. And meanwhile, due to the design of the integrated sandwich structure, the problems of aging and layering of the adhesive layer in severe environments such as high temperature and damp and hot environments are avoided, and the integrity and durability of the structure are also remarkably improved.

The invention relates to the technical field of micro-nano-scale dynamic testing, and discloses a high-rigidity cantilever beam oscillation starting device, which comprises a cantilever beam placing frame, an oscillation starting device and a vibration starting device, the displacement module is provided with an experiment probe used for being in contact with the high-rigidity cantilever beam; the downward pressing control module is connected with the displacement module and used for controlling the experiment probe to execute downward pressing loading action so as to enable the high-rigidity cantilever beam to deform and then execute rapid separation action; and the data acquisition module is used for acquiring a free vibration signal generated by the high-rigidity cantilever beam after the experimental probe is separated from the high-rigidity cantilever beam. A set of experimental device combining a displacement table, piezoelectric ceramics and an experimental probe is designed. The displacement table has multi-degree-of-freedom and high-resolution displacement output capacity, the experimental probe can be quickly moved to a target area, piezoelectric ceramics are high in response frequency and high in stretching speed, and remarkable deformation can be generated in a short time.