95 results about "Low frequency vibration" patented technology

This utility model discloses a displacement-amplified composite friction damper. The upper connecting plate has three sets of equidistant axial connecting ends at its bottom; three sets of equidistant extension plates are located above the core plate, and friction shear components are installed on both sides of the core plate; a lever plate is installed between the axial connecting ends and the extension plates; connecting shafts pass through the axial connecting ends and the extension plates respectively to reinforce the installation of the lever plate; large side plates are fixed at both ends of the lower connecting plate, and the large side plates are tightly fitted to the core plate through the friction shear components. After being amplified by the lever plate, the relative displacement between the upper and lower connecting plates will be greater than the displacement generated by the original building structure. In the small displacement stage: the vulcanized rubber layer absorbs energy through elastic deformation, and the friction plates and steel plates remain relatively stationary, achieving low-frequency vibration isolation. In the large displacement stage: when the vulcanized rubber layer reaches its deformation limit, the steel plate and friction plates begin to slide and rub, significantly improving energy consumption efficiency and adapting to extreme conditions such as earthquakes. The overall structure is simple and easy to install.

This invention discloses an intelligent psychological guidance system for harmonizing the Qi of the internal organs based on TCM emotional differentiation, belonging to the field of medical electronic equipment. The system includes a multi-node physiological signal acquisition module, a central control and data processing module, and an acoustic intervention output module. The system synchronously acquires multi-channel bioimpedance, volumetric pulse wave, and electrocardiogram signals, extracts pulse wave conduction time and local blood perfusion index, constructs Qi characteristic parameters, and maps them to generate emotional tags. The central control module locks the target resonance unlocking frequency according to the tags, modulates low-frequency vibrations with reference audio to synthesize a multimodal signal, and further combines physiological pulse transmission delay to perform phase compensation, controlling the precise output of the intervention signal during ventricular diastole. Steady-state determination and closed-loop tracking are performed based on the dynamic gradient of impedance variance. This invention achieves objective quantification of TCM differentiation and ensures high-precision physical alignment between intervention energy and the hemodynamic state of the internal organs.

The application discloses a self-adaptive multi-frequency band bionic vibration snake and insect expelling device and method, and belongs to the technical field of outdoor protection equipment. The device comprises a tool carrier, a bionic low-frequency vibration generating module, a main control module, an infrared sensing module and a power supply module, and can be pre-installed or externally mounted. The vibration module is in reliable contact with the ground, thereby ensuring effective vibration conduction. The device outputs adjustable bionic pulse vibration of 15-280 Hz, simulates the ground stepping signal of large terrestrial animals, and realizes targeted repulsion by using the differential vibration sensing characteristics of snakes, insects and mice. The device is provided with three working modes of fishing silence, camping global and strong snake repulsion, and is integrated with functions of starting gradient protection, human body intelligent start and stop, multi-dimensional resistance, ground medium self-adaptation and environmental parameter compensation. The device supports single independent protection and multi-ring networking efficiency, has a protection level of IP67, is suitable for all scenes such as fishing, camping, yard and breeding, and can realize integrated long-acting physical repulsion of snakes, insects and mice.

A multi-source heterogeneous data driven large rotating machinery fault diagnosis method, which first collects one-dimensional data composed of low-frequency vibration signals, medium-frequency vibration signals and temperature signals, and two-dimensional data composed of operation images at the same time, then fuses the one-dimensional data and two-dimensional data by Bayes theorem to obtain a diagnosis result, at the same time, obtains a diagnosis result B according to the low-frequency vibration signals and medium-frequency vibration signals, and obtains a diagnosis result C according to the temperature signals, then sums up the diagnosis results A, B and C according to the weighted summation method to obtain the final diagnosis result, if the final diagnosis result is greater than or equal to 0.5, it is judged that there is a fault, if it is less than 0.5, it is judged that there is no fault. The design not only monitors multiple signals, but also has good fault diagnosis effect.

This utility model relates to the field of sound insulation technology, and discloses a soundproof shell and air conditioning unit, including a shell, a rubber damping layer disposed on the inner side of the shell, and a low-frequency sound-absorbing layer and a high-frequency sound-absorbing layer. By placing the low-frequency sound-absorbing layer between the rubber damping layer and the high-frequency sound-absorbing layer, this utility model allows the rubber damping layer to buffer low-frequency vibrations during air conditioning unit operation, reducing the low-frequency vibration energy transmitted to the shell and lowering low-frequency noise generation. The low-frequency sound-absorbing layer, positioned adjacent to the rubber damping layer, can promptly receive and absorb the low-frequency vibration energy buffered by the rubber damping layer, resulting in more thorough low-frequency noise reduction and improving the overall noise reduction effect of the soundproof shell. This effectively prevents the shell from vibrating and amplifying low-frequency noise. Simultaneously, the high-frequency sound-absorbing layer absorbs and blocks high-frequency noise, ensuring that noise in different frequency bands (low, medium, and high) is effectively absorbed and blocked.

The utility model discloses a kind of sound-absorbing cavity structures of low-noise air-cooled motor shell, the device includes: motor shell, the motor shell is sequentially provided with first cavity and second cavity from inside to outside, soundproofing cotton is equipped in the first cavity, soundproofing cotton one end is equipped with soundproofing board, a circle of triangular support plate is equipped in the second cavity, the second cavity is vacuum-like.The utility model has the advantages that: first cavity and second cavity form double sound-absorbing structure.Soundproofing cotton in first cavity cooperates with honeycomb soundproofing board, wherein the grid three-dimensional structure of soundproofing cotton can increase the contact area with noise, and high-frequency airflow noise can be efficiently absorbed;Honeycomb soundproofing board utilizes the porous feature of honeycomb structure, further blocks and attenuates noise.The vacuum state of second cavity can cut off the path of sound propagation through air, effectively blocks low-frequency vibration noise, and double cavity cooperates, meets the use scene that air-cooled motor is higher in noise control requirement.

The embodiment of the application provides a kind of switch area driving state monitoring method, system and storage medium, belong to rail transit operating state monitoring technical field.The method comprises: based on the vibration signal generated by rail in the process of train passing switch area along the line laid vibration sensor of rail, to obtain the wide frequency vibration signal corresponding to the process of train passing switch;The wide frequency vibration signal is preprocessed to obtain the effective vibration signal for state analysis;Effective vibration signal is analyzed in time-frequency, determine the time information of each wheel of train through measuring point, and determine the running speed of train through switch area;Effective vibration signal is analyzed in frequency domain, extract low-frequency vibration characteristics, and judge whether there is car shaking phenomenon when train passes through switch area by combining the running speed of train through switch area, to obtain the corresponding driving state monitoring result.The scheme of the application realizes the automatic identification of car shaking phenomenon when train passes through switch area and driving state monitoring.

This utility model discloses an automatic raw material dispensing mechanism, belonging to the technical field of electrode paste production equipment. It includes a frame, a spiral conveying component, a drive motor, and an operation controller. The inner wall of the spiral conveying component is provided with a gradient hydrophobic composite material layer, which is composed of 3-5 alternating layers of nano-silica hydrophobic coating and polyether ether ketone wear-resistant layer. The outer wall of the spiral conveying component is evenly distributed with dynamic airflow regulating components in a ring. A multimodal vibrator is also integrated on the outer wall of the spiral conveying component. The multimodal vibrator includes a piezoelectric ceramic high-frequency vibrator and an electromagnetic low-frequency vibrator. The piezoelectric ceramic high-frequency vibrator and the electromagnetic low-frequency vibrator are staggered along the axial direction of the spiral conveying component, and the vibration direction is set at a 30-60° angle to the axis of the spiral conveying component. This effectively solves the problem of severe material adhesion and reduced mixing quality after long-term operation of existing automatic dispensing mechanisms.

The application relates to the technical field of fabric support, in particular to a wrinkle-preventing silk fabric suspension type shaping support structure, which comprises a suspension support, a top plate, a cloth winding shaft, an auxiliary beating assembly and a wrinkle-removing positioning assembly, the top plate is fixedly connected at the top of the suspension support, and the wrinkle-removing positioning assembly is installed at the side of the suspension support close to the auxiliary beating assembly. The wrinkle-preventing silk fabric suspension type shaping support structure of the application simulates the natural unfolding effect of manual beating through low-frequency vibration of the auxiliary beating assembly, and avoids the damage of high temperature or chemical treatment to silk fibers. The cloth winding shaft symmetrically winds large-size silk fabrics, so that the fabrics are uniformly stressed in a suspension state, and folding marks are completely eliminated, and meanwhile, the transverse occupied space is saved; the fabric is gently pressed against the fabric edge by rotating the handle to drive the threaded rod, so that the vertical direction of the fabric is maintained, and oblique distortion wrinkles are avoided; the limiting block ensures that the fabric does not displace during beating, and the wrinkle-removing efficiency is improved.

The utility model relates to sealing strip technical field, concretely is a kind of shock resistance sealing strip for electronic appliance, the composite material of silicon rubber main part and polyurethane shock resistance layer, through the synergistic effect of material of different elastic modulus, the attenuation of broadband vibration is realized. The elastic deformation capacity of phosphor bronze spring post can absorb vibration energy below 2000Hz, and the damping characteristic of polyurethane cavity is remarkable to low-frequency vibration (10~50Hz) buffering effect, the composite material of silicon rubber main part and polyurethane shock resistance layer, through the synergistic effect of material of different elastic modulus, the attenuation of broadband vibration is realized. The elastic deformation capacity of phosphor bronze spring post can absorb vibration energy below 2000Hz, and the damping characteristic of polyurethane cavity is remarkable to low-frequency vibration (10~50Hz) buffering effect.

The application relates to the technical field of equipment base, and discloses a fixing base for a textile equipment, which comprises a base, a buffer base plate, a positioning mechanism, a supporting leg and a buffer mechanism. The piston rod of a telescopic air cylinder is telescoped to drive the connected mounting plate and the slider connected with the mounting plate to move back and forth on the guide rail, so that the mounting position of the textile equipment is adjusted. The mounting position size of the textile equipment of different sizes can be adjusted, and the mounting efficiency of the equipment is improved. Then, the buffer mechanism is arranged in the base of the textile equipment, the vibration energy is dispersed by the first-stage buffer plate, the high-frequency vibration can be absorbed by the buffer spring and the air bag ball, the second-stage buffer spring absorbs the medium and low-frequency vibration, the full-band vibration of the textile equipment is gradedly inhibited, the vibration of the core components such as the main shaft bearing of the equipment is buffered and damped, the abrasion rate of the equipment components is reduced, the replacement cycle is prolonged, and the noise of the textile equipment can be reduced.

The utility model relates to the technical field of automobile parts, and discloses an automobile suspension lining structure which comprises a plastic outer pipe, a rubber sleeve is fixedly bonded to the inner side of the plastic outer pipe, supporting rods are fixedly connected to the inner walls of the two opposite sides of the bottom of the plastic outer pipe, and a plastic wrapping pipe is fixedly connected between the two supporting rods. The outer wall of the middle of the plastic wrapping pipe is fixedly sleeved with a plastic wrapping pipe, a vulcanized inner pipe is fixed to the inner side of the plastic wrapping pipe, the outer wall of the middle of the plastic wrapping pipe is fixedly sleeved with a hopper-shaped plastic connecting pipe, the outer wall of the top of the plastic wrapping pipe is sleeved with a plastic inner sleeve, and the outer wall of the plastic inner sleeve is fixedly sleeved with a plastic outer sleeve. The lower end face of the plastic outer sleeve is fixed to the upper end face of the hopper-shaped plastic connecting pipe, and plastic parts such as the plastic wrapping pipe, the plastic inner sleeve and the plastic outer sleeve provide stable support and specific rigidity for the whole structure and are matched with the rubber sleeve, so that the lining can generate enough damping to attenuate vibration under low-frequency vibration, and the vibration resistance of the lining is improved. Therefore, the low-frequency damping performance of the suspension is improved.

The utility model relates to the technical field of automobile parts, and disclose a kind of mounting support of automobile shock absorber;Including support, cavity is set in support inside, lower connecting seat is arranged in cavity, the top of lower connecting seat is provided with arc gasket, the top of support is provided with upper connecting seat, the mounting seat for connecting shock absorber is fixedly installed in the top of upper connecting seat, and the bottom of upper connecting seat is slidably connected with lower connecting seat in support;The front of support is detachably installed with panel by third bolt, lower connecting seat is fixedly connected with support by first bolt, the utility model cooperates lower connecting seat, arc gasket, buffer pad and arc-shaped lug, can efficiently buffer the vibration when shock absorber works, greatly reduce the transmission of vibration to vehicle body, reduce low-frequency vibration noise, avoid the connection loosening caused by long-term vibration, the recess in the top of lower connecting seat and the arc-shaped gasket accurate limit of limit slot, ensure that buffer structure works stably.

This invention discloses a companion robot and its control method, relating to the field of companion robot technology. To address the problem, it specifically includes: a main body equipped with a display screen, button mechanism, and charging mechanism; a main control module, a multimodal perception module, a multimodal soothing intervention module, a communication module, and a power management module for providing power to the main body, main control module, multimodal perception module, multimodal soothing intervention module, and communication module. This invention, by setting up three major intervention units—adaptive sound and light intervention, micro-tactile soothing, and temperature-sensing soothing—can not only achieve physiological sleep rhythm regulation through sound and light guidance, but also simulate the soothing action of a real person's gentle patting and stroking through low-frequency vibration synchronized with the user's breathing rate, and simulate the tactile sensation of human body temperature through constant-temperature heat therapy, achieving immersive emotional companionship and psychological soothing, thus overcoming the core defects of traditional sleep aids—the lack of psychological soothing ability and the inability to address the root cause of anxiety.

The invention belongs to the field of vibration power generation. The vibration harvesting component for vibration power generator comprises a rectangular-shaped frame, a pillar. It expands the frequency band and harvests low vibration energy. It involves a vibration harvesting device used in electromagnetic vibration power generator and a vibration harvesting device used in composite vibration power generator, both of which comprises a vibration harvesting component and a gimbal. Both devices make the vibration harvesting components to capture omnidirectional external excitation, the latter also generates multiple types of feedback actions for various power generation units to utilize. It involves an electromagnetic vibration power generator and a composite vibration power generator. The former comprises a vibration harvesting device used in electromagnetic vibration power generator, the latter comprises a vibration harvesting device used in composite vibration power generator. Both improve the energy generation efficiency.

This invention relates to the field of automotive parts technology, and specifically to a noise-reducing automotive carpet and its manufacturing method. The carpet includes an embedded groove and a recessed structure spaced apart. A raised structure is provided on the bottom surface of the surface layer. A damping block is disposed within the embedded groove, with gaps between the damping block and the side and bottom walls of the groove. Foaming material from a foam layer fills these gaps, allowing the damping block to suspend within the embedded groove through the foaming material in the gaps. Mechanical locking replaces interlayer bonding to improve connection reliability, and the relative displacement generated by the suspended damping block dissipates low-frequency vibrations to enhance noise reduction performance. The manufacturing method of this noise-reducing automotive carpet, by laying a bottom layer felt, placing the damping block, laying the foaming material, covering the surface layer, molding and hot pressing, and cooling and shaping, allows the carpet body to achieve a reliable connection between the surface layer and the bottom layer felt without relying on adhesives. Furthermore, the relative displacement of the damping block through the foaming material in the gaps dissipates low-frequency vibration energy.

The state improvement promotion system propagates ultrasonic vibration or low-frequency vibration so as to transmit vibration energy to the entire target region in the brain in a state where a subject wears a vibration energy supply unit on the head, thereby reflecting an effect of physical movement of the subject produced by an operation function improving device.

The utility model discloses a hydraulic oil cylinder that high safety performance belongs to hydraulic oil cylinder technical field, and its technical scheme main points include hydraulic oil cylinder body, the bottom fixed connection of hydraulic oil cylinder body has the connecting mechanism, the surface fixed connection of connecting mechanism has the damping mechanism, and connecting mechanism realizes hydraulic oil cylinder body and the anti -vibration fastening of connecting mechanism through high -strength thread, and four limit rods form rigid frame to the left and right in front and back, and the radial displacement of damper is limited, prevents damping element overload deviation, and provides the installation reference for damper simultaneously, ensures the symmetry of damping mechanism, and the damper in damping mechanism can carry out damping dissipation to vibration energy, reduces vibration amplitude, and the fixed link is welded between damper bottom and fixed block, and the axial load of damper is dispersed to fixed plate chamfer place, avoids the weld cracking of single point stress, and the neoprene pad can cope with low -frequency vibration, prevents horizontal displacement when resonance.

The utility model discloses a high temperature operation roller drum of built -in sound elimination structure, including fixed part and center axis, the lateral wall fixed connection of fixed part has the warehouse, and the both ends of center axis respectively penetrate the lateral wall of both ends warehouse and rotate and connect in the lateral wall surface of fixed part, and the surface of center axis is fixedly connected with a plurality of impeller pieces in the circumferential array of the inside part of warehouse, and the inside of warehouse is filled with viscous silicon base high temperature fluid, the utility model discloses the both sides of center axis are provided with the warehouse, and the viscous silicon base high temperature fluid is filled in the warehouse, when the rotation of center axis and outer roller shell, the impeller piece on the surface of center axis will cut the viscous silicon base high temperature fluid in the warehouse, and the low frequency vibration produced in the rotation of outer roller shell and center axis is converted into heat energy by the shear vortex effect, thereby played the damping effect, reduced low frequency noise.

This invention discloses a multi-directional water-impact frequency-upgrading piezoelectric energy harvesting device and method, belonging to the field of piezoelectric material energy harvesting control. The device includes: an outer frame, a cantilever base plate, a piezoelectric sheet, a mass block, a cylindrical water tank, and an elastic film. One end of the cantilever base plate is fixed to the inner side wall of the outer frame, and the other end is fixed to the mass block. The piezoelectric sheet is attached to the cantilever base plate to form a low-frequency drive system. The bottom end of the cylindrical water tank is fixed to the lower surface of the outer frame, and the elastic film is attached to the cavity at the top of the cylindrical water tank to form a high-frequency piezoelectric system. Under external low-frequency vibration excitation, the low-frequency drive system, which has a lower natural frequency, resonates, greatly increasing the vibration amplitude of the water tank. This causes the water in the water tank to continuously and significantly impact the high-frequency piezoelectric system, achieving the purpose of frequency upgrading. This invention utilizes water impact to drive the high-frequency piezoelectric beam to upgrade its frequency, improving the energy harvesting efficiency and output power of the piezoelectric energy harvesting device. Simultaneously, it has advantages such as simple production and assembly, being environmentally friendly and pollution-free, and having a miniaturized structure.

The application provides a car damping pad and an electric car, the center of the damping pad is provided with a mounting hole, the vibration body outside of the damping pad is divided into an upper half part and a lower half part which are structurally symmetrical through a mounting groove; the upper half part is provided with a sawtooth support part at the upper portion; the upper half part between the mounting hole and the sawtooth support part is uniformly distributed with at least two layers of recess structures which are staggered with each other and are used for reducing low-frequency vibrations in X and Y directions. The upper half part and the lower half part between the mounting hole and the sawtooth support part are uniformly distributed with at least two layers of recess structures which are staggered with each other, so that low-frequency vibrations in X and Y directions can be weakened.

This application discloses an oil-gas separator, including a cylinder with an inlet end and an outlet end; and at least one reinforcing ring fixedly sleeved on the outer peripheral wall of the cylinder. The reinforcing ring is configured to increase the local stiffness of the cylinder, thereby adjusting the overall modal frequency of the cylinder to above a preset threshold, so that the natural frequency of the cylinder avoids the excitation frequency of the compressor. This application eliminates resonance noise by setting a reinforcing ring on the outer periphery of the cylinder and utilizing the principle of passive structural control. The reinforcing ring significantly increases the local stiffness of the shell, forcing the overall modal frequency of the oil-gas separator to jump above the main excitation frequency band of the compressor, thus cutting off the physical conditions for resonance at its source and overcoming the defect of low absorption efficiency of traditional sound-absorbing cotton for low-frequency vibration. This solution directly modulates the noise radiation source mechanically, effectively suppressing the sound radiation efficiency of the shell. At the same time, the optimized structural parameters eliminate the planar modal resonance of the additional structure itself, achieving substantial improvement in noise across the entire frequency band.

This invention discloses an electromagnetic generator and its operating method for converting ultra-low frequency vibration energy, belonging to the field of vibration energy harvesting and micro-power generation technology. It includes a base, an electromagnetic induction component, an inner rotor, a transmission device, and a top cover. The electromagnetic induction component has a central hole, within which the inner rotor is housed. The electromagnetic induction component includes an outer rotor and a stator, arranged vertically opposite each other. The outer rotor has a magnet, and the stator has a coil. The base is connected to the bottom of the inner rotor via a thrust bearing, the middle of the inner rotor is connected to the top cover via a linear bearing, and the top of the inner rotor is connected to the top cover via the transmission device. The inner rotor is also connected to the outer rotor via a one-way bearing. The base is also connected to the top cover via a linear bearing, and a spring is provided between the top cover and the linear bearing. This invention can harvest ultra-low frequency vibration energy from the environment, achieving higher energy harvesting efficiency compared to traditional electromagnetic energy harvesters.

The present invention belongs to the technical field of low-frequency vibration control, provides a low-frequency tuned mass damping device with reverse-stretched compression springs. The device fully realizes large compression deformation and reverse stretching deformation of the springs within a limited vertical space by performing supercompression-reverse stretching treatment on the compression springs, achieving lower stiffness required by the vibrating system, and can realize low-frequency tuning within the limited vertical space of the main beam of the bridge, greatly expanding the frequency application range of the tuned mass device. Meanwhile, the device avoids the stability problem faced by the traditional compression spring tuned mass placed on the springs and the problem of excessive damping and instability caused by the increase of guiding members as a result. The device can be applied to the control of various types of low-frequency vibration in vertical, lateral and torsional directions of various engineering structures.

The application discloses a flexible constraint particle damping vibration isolation hammer, which comprises a wire clamp, a steel strand, two hammer heads and multiple partitions, the middle part of the steel strand is connected with the wire clamp, the two hammer heads are arranged at the two ends of the steel strand respectively, the hammer head is a hollow pipe body structure, the two ends of the hammer head are respectively provided with a hammer head end cover, the end part of the steel strand is connected with the hammer head end cover away from the wire clamp after penetrating through the inside of the hammer head, the multiple partitions are vertically fixed on the inner wall of the hammer head and are arranged around the hammer head, a sector cavity is divided between the adjacent two partitions and the inner wall of the hammer head, a group of flexible particle damping units are arranged in each sector cavity, and each group of the flexible particle damping units comprises multiple particles covered by a first flexible constraint material. The flexible constraint particle damping vibration isolation hammer replaces viscous damping with maximum friction damping, realizes low-frequency vibration suppression of the particle vibration isolation hammer on the power transmission line, does not need to be replaced and maintained regularly, and has the advantages of no grease and no pollution.

The utility model discloses a kind of sound visualization display devices, it is related to sound visualization display technical field, including support frame, it is characterized by: the upper part of the support frame is fixedly connected with vibration plate, the lower part of the vibration plate is attached with sounder, the lower part of the sounder is provided with fixed frame, the side of the fixed frame is fixedly connected with fixed frame, the side of the fixed frame is hinged with movable frame, the movable side of the movable frame is provided with connecting screw rod, one end of the connecting screw rod is threadedly connected with fixed frame. The utility model is provided with the effect of scattering the particle on vibration plate by the setting of fixed frame, low-frequency vibration motor, the cooperation setting of electric telescopic link, connecting frame, cover plate, low-speed motor, scraper and silica gel sleeve, the scattered particle can be scraped flat in the process of use, thereby the effect of evenly distributing particle conveniently is played, the purpose of particle initial state is recovered conveniently.

The application relates to the technical field of wind power generation, in particular to a tower vibration suppression method and device, wherein the method comprises the following steps: constructing a vibration second-order dynamic model for describing a tower vibration state, determining a tower vibration influencing factor according to the vibration second-order dynamic model, determining a unified variable pitch loop control component and an independent variable pitch loop control component for suppressing tower vibration and superimposing the two components to generate a total variable pitch loop control quantity, controlling a target wind turbine to execute a variable pitch control instruction corresponding to the total variable pitch loop control quantity, adjusting an actual pitch angle of the target wind turbine to a total pitch angle corresponding to the superposition, and suppressing the tower vibration state to meet a target requirement. The application can effectively suppress the tower first-order natural frequency component in the front and rear vibration of the tower and the low-frequency vibration component synchronized with the wind wheel rotation frequency, and realizes power tracking and vibration suppression of the front and rear directions of the tower.