56 results about "Bending vibration" patented technology

Disclosed is a multi-modal and multi-degree-of-freedom piezoelectric active vibration isolation platform and a working method therefor. The piezoelectric active vibration isolation platform includes an upper platform, a lower platform, a control module, and four vibration isolation modules, where the vibration isolation module includes a passive vibration isolation unit and an active vibration isolation unit; the passive vibration isolation unit includes an upper connector, a lower connector, a cross Hooke hinge, and a first acceleration sensor; the active vibration isolation unit includes a fixed beam, a pre-tightening bolt, a second acceleration sensor, and a driving component; the platform can provide active vibration isolation for the longitudinal (axial) vibration and the bending vibration in any radial direction of a vibration isolation object, and has the advantages of fast response, resistance to electromagnetic interference, and light weight.

The invention discloses a longitudinal bending composite type six-degree-of-freedom piezoelectric active vibration isolation platform and a working method thereof. The vibration isolation platform adopts a modular structural design, a vibration isolation connecting platform and a base platform are sequentially arranged from top to bottom and are connected through four uniformly distributed vibration isolation modules, and each vibration isolation module forms a multi-stage vibration transmission structure through a fixed base, a transducer base, a piezoelectric transducer, an amplitude-change pole, a pre-tightening bolt and a small flexible hinge. The control module collects feedback signals of a first acceleration sensor arranged on the vibration isolation connecting platform and feedforward signals of a second acceleration sensor arranged on the base platform, and outputs 12-channel control signals to the piezoelectric transducers of the vibration isolation modules after signal processing. The piezoelectric transducer is driven to generate a composite motion mode of longitudinal vibration and multidirectional bending vibration, and active suppression of longitudinal vibration and radial bending vibration in any direction of a vibration isolation object is achieved. The device has the advantages of multi-degree-of-freedom vibration isolation, compact structure, lightweight design, independent control, high stability and the like, and has important application value in the fields of space reflecting mirrors, micro-nano manufacturing equipment vibration control and multi-degree-of-freedom vibration isolation systems.

The invention discloses a sandwich type piezoelectric driving double-shaft output mobile robot and a working method thereof.The sandwich type piezoelectric driving double-shaft output mobile robot comprises a sandwich type piezoelectric transducer, a pre-pressure applying mechanism, a driving wheel unit, a first output shaft, a second output shaft, a base body frame and a connecting plate, and a clamping mechanism is not arranged on a stator base body of the sandwich type piezoelectric transducer; a single pin of the pre-pressure applying mechanism and a through hole in the middle of a stator node beam are used for restraining, automatic rolling transmission of contact force is achieved under the condition of matching of the pin hole, and pre-pressure transmitted by the pre-pressure applying mechanism achieves force balance under the counter-acting force generated when a first driving foot and a second driving foot of the sandwich type piezoelectric transducer make contact with the curved surface of an output shaft. The elliptical motion trail direction of the stator driving foot can be controlled by controlling the electric signal phase difference of the longitudinal vibration piezoelectric ceramic set and the bending vibration piezoelectric ceramic set, forward and reverse motion of the first output shaft and the second output shaft is achieved through friction contact, and the mobile robot achieves forward, backward and rapid locking motion.

The invention provides a resonance type compliant cavity composite structure pressure-resistant bending disc transducer which comprises a simply-supported ring, composite pressure-resistant assemblies are symmetrically arranged on the simply-supported ring up and down, the composite pressure-resistant assemblies and the simply-supported ring form an air cavity, and each composite pressure-resistant assembly comprises a watertight layer, a piezoelectric ceramic piece, a metal bending disc and a resonance type compliant pressure-resistant shell. The shell is arranged in the simply-supported ring, the metal bent disc is arranged above the shell, a medium cavity is formed between the shell and the metal bent disc, water permeable holes are formed in the side wall of the medium cavity, and the exterior of the transducer is communicated with the medium cavity. And a watertight layer covers the outer side. According to the composite shell structure, a pressure bearing structure and a driving structure are designed separately, pressure balance between driving force and a driving element is achieved through a coupling medium, and the anti-pressure capacity is improved; the shell is a bending vibration shell with the working frequency consistent with that of the transducer, the driving impedance is low, and the static pressure resistance is high.

The invention provides an ultrasonic transducer and ultrasonic cleaning equipment, the ultrasonic transducer comprises a piezoelectric exciter and a vibration radiant panel, the vibration radiant panel is fixed on the piezoelectric exciter, a power supply is electrically connected with the piezoelectric exciter, so that the piezoelectric exciter can generate longitudinal vibration, and the longitudinal vibration of the piezoelectric exciter can excite bending vibration of the vibration radiant panel. The longitudinal vibration sandwich type piezoelectric ultrasonic transducer solves the defects that an existing longitudinal vibration sandwich type piezoelectric ultrasonic transducer is small in radiation area, weak in longitudinal displacement amplitude, long in longitudinal size and the like to a great extent, and has the advantages of being small in space needed by operation, large in sound radiation area and sound radiation power, small in size and the like. The ultrasonic transducer can be widely applied to the application requirements of miniaturization and thinning of the installation space of the ultrasonic transducer. Meanwhile, the longitudinal bending displacement amplitude conversion ratio of the ultrasonic transducer can be influenced by the length, and / or the width and / or the thickness of the vibration radiant panel, so that the longitudinal bending displacement amplitude conversion ratio of the ultrasonic transducer is further improved through the size of the vibration radiant panel.

The invention provides a multi-dimensional vibration platform with oppositely-arranged double-sandwich piezoelectric actuators and an excitation method of the multi-dimensional vibration platform, and belongs to the technical field of high-frequency vibration engineering and micro-nano machining.The vibration platform comprises a center platform, the two oppositely-arranged piezoelectric actuators, two end covers and two bolts, wherein the center platform is integrated with the tail end platform, the two flexible hinges and the two amplitude-change poles, and the center platform is slender and is in mirror symmetry about the longitudinal symmetry plane of the tail end platform. The piezoelectric actuator comprises a longitudinal vibration ceramic group, a bending vibration ceramic group around the Y axis and a bending vibration ceramic group around the Z axis, translation along the X / Y / Z axis and rotation around the Y / Z axis can be realized through in-phase or anti-phase excitation different combinations under the condition of not increasing extra driving channels, and five-degree-of-freedom high-frequency micro-vibration output can be achieved at most. The structure has high symmetry, low parasitic vibration, compact size and high integration, and is suitable for precise engineering scenes such as micro-nano processing, laser-assisted manufacturing, cell manipulation and active vibration suppression.

The invention discloses a magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device and an operation method, the longitudinal-bending dual-mode cutting device is provided with a longitudinal-bending dual-mode main body, the front end of the longitudinal-bending dual-mode main body is provided with a stepped-shaft-shaped tool apron, chamfers or fillets are arranged between steps, the front end of the stepped-shaft-shaped tool apron is provided with a tool mounting part, and the front end of the stepped-shaft-shaped tool apron is provided with a tool holder; a threaded connection hole is formed in the cutter mounting head part, and the cutter is matched with the threaded connection hole and is fixed on the cutter mounting head part through a cutter fixing bolt. Free switching between the longitudinal vibration mode and the bending vibration mode of the machining device can be achieved by adjusting the direct current of the bias coil at the bias coil rack according to the working condition and the machining requirement of a workpiece, and the precision of the machined surface and the flexibility of a machining tool are improved.

The utility model relates to carbon tape processing technical field, and disclose a kind of carbon tape base ink dip-dyeing device, including dip-dyeing box, the left and right ends of dip-dyeing box are respectively provided with input and output for carbon tape base to pass in, and the inner bottom side of dip-dyeing box is provided with abutting roller, and the upper portion of dip-dyeing box is provided with bending vibration subassembly corresponding abutting roller;The bending vibration subassembly includes the cross frame being arranged on the top of dip-dyeing box.This carbon tape base ink dip-dyeing device, carbon tape base enters dip-dyeing box inside under the conveying effect of external conveying mechanism, when carbon tape passes through dip-dyeing box, utilize hydraulic rod elongation to drive link plate and press frame to move down, and carbon tape base is abutted and bent between abutting roller and press roller, utilize bending effect to extend dip-dyeing path and time, and utilize exciter to drive press frame and press roller vibration, vibration rolling is carried out to carbon tape base, to further shake out the fine bubble adhered to the surface of carbon tape base, improve the contact effect of ink and carbon tape base, to further improve dip-dyeing quality.

The invention discloses a dynamic supporting lead screw device and a working method thereof, and belongs to the field of lead screw equipment. According to the technical scheme, the dynamic supporting lead screw device comprises a main lead screw and a plurality of sets of auxiliary lead screws, a supporting assembly is installed on a nut base of each auxiliary lead screw, and the supporting assemblies are supported on the lower portion of the peripheral face of the main lead screw; a detection mechanism is arranged on the main lead screw, and the detection mechanism can detect deformation data of the main lead screw in real time; the device further comprises a control module, the control module is electrically connected with the detection mechanism and the multiple sets of auxiliary lead screws, and the control module can receive main lead screw deformation data detected by the detection mechanism and control the auxiliary lead screws to enable the supporting assembly to move to a proper position. The control module drives the auxiliary lead screw to dynamically adjust the position of the supporting assembly, real-time matching of the supporting point position, lead screw deformation and load distribution is achieved, the defect that a traditional fixed support cannot be matched with dynamic loads is thoroughly overcome, the operation stability and positioning precision of the main lead screw are remarkably improved, and bending vibration and droop deformation are effectively restrained.

A first amplitude-change pole body and a second amplitude-change pole body are coaxially arranged, the projection of the second amplitude-change pole body along the central axis of the second amplitude-change pole body is located in the first amplitude-change pole body, and a containing cavity is formed in the end, away from the first amplitude-change pole body, of the second amplitude-change pole body. The positioning rod body is arranged at the end, away from the second amplitude-change rod body, of the first amplitude-change rod body and is coaxial with the first amplitude-change rod body, the flange structure is arranged on the side wall of the first amplitude-change rod body, and a gap is formed between the flange structure and the side wall of the second amplitude-change rod body. The adjusting block extends into the gap, at least part of the adjusting block is connected to the end, close to the second amplitude-change pole body, of the first amplitude-change pole body, and the adjusting block abuts against part of the side wall of the second amplitude-change pole body. The adjusting block can enable vibration to act on the second amplitude-change pole body to enable the second amplitude-change pole body to achieve polarization, the bending vibration effect is achieved through the combined action of longitudinal vibration and polarization, and motion of a cutter is better facilitated.

The invention relates to a bending disc transducer utilizing deformation in the ceramic thickness direction. The bending disc transducer comprises a disc-shaped inner supporting plate. The piezoelectric ceramic stacks are uniformly arranged at intervals in the circumferential direction of the internal supporting plate and are fixed on the outer side of the internal supporting plate; wherein the polarization direction of the piezoelectric ceramic stack is consistent with the thickness direction of the piezoelectric ceramic stack. A driving mode is creatively changed, and the disc is driven to generate bending vibration by telescopic vibration of the piezoelectric ceramic stack in the thickness direction, so that the ceramic stack mainly bears compressive stress instead of tensile stress under the action of hydrostatic pressure, and the characteristic of high compressive strength of a ceramic material is fully utilized; and the hydrostatic pressure resistance of the bending disc transducer is improved in a breakthrough manner.

To provide a technology that can achieve an improvement in the characteristics of a pump configured to pump a fluid by bending vibration of a plate-shaped piezoelectric actuator and downsizing of the pump. A pump structure according to an aspect of the present disclosure includes an actuator capable of bending vibration, a fixing portion disposed to surround the actuator, and a support portion disposed integrally with the fixing portion and the actuator to connect the fixing portion and the actuator, the support portion supporting the actuator to enable the bending vibration with respect to the fixing portion. The actuator and the fixing portion are not similar in shape. The support portion includes a folded portion at which the support portion can be overlapped along the outer shape of the actuator.

A resonance device is provided that includes a resonator including a base, a plurality of vibration arms having arms on a fixed end side connected to the base and weight portions on an open end side. A frame is around a periphery of the vibration arms and holds the base. The vibration arms extending parallel to each other and vibrating in an out-of-plane bending vibration mode as a main vibration. A lower cover and an upper form a vibration space for the resonator. A protrusion protrudes into the vibration space from an inner surface of the lower or upper cover. The frame has projections formed in positions facing the weight portions in a plan view.

The application provides a piezoresistive sound pressure gradient hydrophone, which comprises two ceramic substrate printed circuit boards in the shape of a disc, four piezoresistive strain gauges, a base and a sound insulation barrier, the piezoresistive strain gauges are welded on the ceramic substrate printed circuit boards in the shape of a disc, the edges of the ceramic substrate printed circuit boards in the shape of a disc are supported on the base, a bending disc type vibration system with edges simply supported and a middle free is formed, the bending disc type vibration system does forced bending vibration under the action of underwater sound waves, the piezoresistive strain gauges welded thereon are extruded and stretched, and thus impedance change occurs; the ceramic substrate printed circuit boards simultaneously play a signal conditioning role, and the impedance change of the piezoresistive strain gauges is converted into voltage change through a Wheatstone bridge type circuit structure; the sound insulation barrier isolates the two ceramic substrate printed circuit boards in the shape of a disc, a sound path difference is formed, and the signals of the two ceramic substrate printed circuit boards are subtracted to obtain a sound pressure gradient signal. The application has the advantages that machine and electric integration is realized, and miniaturization is realized.

The invention discloses a piezoelectric-driven amphibious extraterrestrial planet surveying robot and a working method thereof, the whole robot adopts a differential-driven three-wheel layout structure, and double piezoelectric driving feet arranged on the two sides of the front end drive an end paddle impeller to drive a tail end driven paddle impeller to move. The piezoelectric driving feet are fixed on the metal vehicle body through bolts, a driving controller is arranged in the metal vehicle body, buoyancy adjusting devices are arranged on two sides of the metal vehicle body, and the tail of the metal vehicle body is connected with a driven paddle wheel through a driven wheel adjusting rod. The piezoelectric driving foot part comprises a pre-tightening force bolt, a fixing flange, a piezoelectric ceramic set, a metal front end, a double-end stud, a double-bearing rotor, a rotor pre-compression spring and a locknut. According to the piezoelectric driving foot, the bending vibration mode of the cantilever beam type stator is stimulated, and the free end vibration is used for driving the double-bearing rotor to drive the driving end paddle impeller to rotate. According to the invention, the integrated design of structure and function is realized, the structure is simple, and microminiaturization is easy. The piezoelectric driving mode is adopted for underwater operation, dynamic sealing is not needed, the pressure resistance is good, and high application value and good economic benefits are achieved in the field of extraterrestrial planet exploration.

The utility model discloses a kind of V-shaped blade milling cutter and tool, it includes: V-shaped blade milling cutter includes positive mounting surface, bottom mounting surface and four side connecting surfaces, positive mounting surface and bottom mounting surface are oppositely arranged, four side connecting surfaces are sequentially connected and complete closure, positive mounting surface and bottom mounting surface are connected with the two sides of four side connecting surfaces respectively, the connecting place of each side connecting surface with positive mounting surface respectively, and the connecting place of bottom mounting surface are all formed with cutting edge, cutting edge is arranged in V type. Four cutting edges switch into eight cutting edges, and V-shaped structure can also split wide chip into smaller part, reduce cutting force fluctuation and chip removal resistance, change the direction and distribution of cutting force, reduce the radial force component causing tool bending vibration, avoid all blades to reach maximum cutting force peak value simultaneously, with similar uneven tooth pitch vibration damping effect, thereby more adapt to long overhang application scenario.

The invention discloses a multi-dimensional vibration platform with double sandwich type piezoelectric actuators arranged in the same direction and an excitation method of the multi-dimensional vibration platform, and relates to the field of high-frequency vibration engineering and micro-nano machining. Aiming at the problem that a traditional piezoelectric vibration platform is difficult to realize higher-dimension multi-degree-of-freedom operation capability, the piezoelectric vibration platform comprises an output platform, two piezoelectric actuators, two end covers and two bolts. The piezoelectric actuator is provided with a longitudinal vibration ceramic set and two bending vibration ceramic sets arranged in the orthogonal direction, and through excitation of voltage signals with the same phase or the phase difference of 180 degrees, rotation around the X axis, the Y axis and the Z axis and translation along the X axis and the Y axis are achieved. Due to structural symmetry and driver arrangement constraint, Z-direction translation is strongly coupled with an existing mode, so that high-practicability five-degree-of-freedom output is focused. The same-direction arrangement type design is adopted, the characteristic of low motion coupling is achieved, and displacement deformation of the piezoelectric actuator can be converted into different actions needed by multi-dimensional vibration of the tail end platform. The method is suitable for the fields of laser processing, vibration-assisted processing, micro-nano operation, active vibration suppression and the like.

The invention discloses a four-sandwich type piezoelectric actuator equidirectional central symmetry arrangement type multi-dimensional vibration platform and an excitation method, relates to the field of high-frequency vibration engineering and micro-nano control, and solves the problems that a parasitic mode is serious due to the fact that a plurality of existing piezoelectric actuators are asymmetric in structure in practical application, an additional vibration mode is easily caused by asymmetric layout, and the vibration performance is poor. The vibration platform comprises a tail end platform, four flexible hinges and four actuating units, the tail end platform is a motion output component with biaxial mirror symmetry, and the four actuating units are symmetrically arranged in a rectangular vertex mode and integrate longitudinal vibration, bending vibration ceramic sets around the Y axis and bending vibration ceramic sets around the Z axis. Through an in-phase or anti-phase excitation strategy, six-degree-of-freedom vibration output of three-axis translation and three-axis rotation can be realized. And each actuating unit realizes axial pre-tightening through a first bolt, so that the reliability of the piezoelectric ceramics is ensured. And the method is suitable for application scenes requiring high-stability and multi-axis cooperative motion, such as precision micromachining and ultrasonic-assisted manufacturing.

The application provides an optical platform with breadboard active damping, comprising: a platform unit, the platform unit comprising a top plate, a platform inner core and a platform bottom plate, the platform inner core being arranged between the platform top plate and the platform bottom plate; an active damping component, the active damping component being arranged on the platform unit, the active damping component being provided with a sensor module and a driver module; and a feedback unit, the sensor module being electrically connected with the feedback unit, vibration signals collected by the sensor module being collected, analyzed and processed by the feedback unit to obtain input signals, and the driver module generating vibration according to data of the input signals to offset vibration of an external environment. The application utilizes an active balancing mode to maximize the offset of the influence of platform bending vibration, improves the accuracy of alignment of optical equipment installed on the workbench, and thus improves the precision in the process of optical performance testing.

The invention discloses a natural water treatment method, and relates to the technical field of water treatment. A hydrodynamic excitation environment is constructed in a water treatment reaction channel, and a flexible piezoelectric fiber array is arranged in the water flow direction, so that flexible piezoelectric fibers generate periodic bending vibration under the action of natural water flow or auxiliary hydrodynamic force, and a distributed and non-uniform piezoelectric micro electric field is formed in situ on the surfaces of the fibers and in a water body adjacent to the fibers. The micro electric field continuously disturbs a hydration structure, ion distribution and microbial membrane potential in a water body, so that the molecular structure and biological activity of pollutants are unstable or attenuated. Under an illumination condition, a piezoelectric electric field and photocatalysis synergistically generate active free radicals, so that organic pollutant degradation and microorganism inactivation are realized.

The invention discloses a piezoelectric electromagnetic bimorph sensing structure and a simulation analysis method thereof, and relates to the technical field of sensor design and simulation. The structure comprises a PZT5H piezoelectric layer, an AFC260 alloy elastic blade layer and a PZT5H piezoelectric layer which are stacked in sequence, terminal-ground-terminal parallel excitation is adopted to induce bending vibration, and the resonant frequency can be accurately tuned within the range of 2327 kHz through additional mass. The structure can be further compounded or coupled with a FeGa magnetostrictive layer to form a magnetoelectric sensing unit for non-contact current measurement. According to the matched simulation method, accurate prediction and optimization of resonant frequency, vibration amplitude and stress distribution are realized through parametric modeling, grid encryption, electromechanical / magnetoelectric multi-physics field coupling analysis and stress evaluation. The device is high in integration level and flexible in tuning, remarkably shortens the development period through simulation driving design, improves the reliability, and is suitable for the field of power monitoring and micro sensing.

This invention relates to the field of composite machining equipment technology, and discloses a CNC milling composite machining equipment for machining ring grooves in hardware. The equipment includes a machine tool, a milling section located on the rear side of the machine tool, and a center support base mounted on the inner wall of the machine tool bottom, in front of the milling section. A gantry slide seat one and a gantry slide seat two are slidably mounted on the right side of the center support base from left to right. This CNC milling composite machining equipment for machining ring grooves in hardware effectively solves the problems in the prior art. When performing composite machining on flange gear shafts, the flange extends from the shaft end to form a cantilever structure. During milling the end face groove, the cutting force is perpendicular to the flange end face, causing bending vibration of the flange. Furthermore, during milling the annular groove, the cutting force is axial, leading to axial movement of the part and causing the depth accuracy of the annular groove to exceed tolerances. Simultaneously, the vibration generated during machining causes wavy grooves on the bottom of the groove and exacerbates tool wear.

The invention discloses aviation turbine starter performance test equipment, which belongs to the technical field of starter performance test, and comprises a base, and a connecting flange, a mounting seat, a clutch, a torque meter, a brake, a load module and an eddy current dynamometer which are sequentially arranged on the base and are connected through a coupler to form a linear test shafting. According to the invention, by arranging the active unbalance loading assembly, a complex radial load transmitted by deformation of an aircraft body in flight can be simulated, a centering compensation function is provided to suppress installation error vibration, and by arranging the phase self-counteracting integrated flywheel, by utilizing coupling of two reversely arranged eccentric mass blocks and a torsion spring, the vibration of the aircraft body can be suppressed. The device can passively generate counteracting force opposite to the bending vibration direction of the shafting, passive vibration reduction without delay and external intervention is achieved, real installation stress can be reproduced through cooperation of the counteracting force and the external interference-free passive vibration reduction, meanwhile, it is ensured that the torque and power measuring environment is pure, and the working condition authenticity and data accuracy of testing are improved.

The invention discloses an anchor rod hole-forming all-in-one machine for a sheet-pile wall. The anchor rod hole-forming all-in-one machine comprises a supporting part, a hole drilling part and a maintaining mechanism. The drilling part is arranged above the supporting part, and a driving piece for driving the drilling part to horizontally slide is arranged in the supporting part; the holding mechanism is composed of a frame structure, a holding assembly and a detection assembly. The frame structure is arranged on the inner side of the supporting part and arranged on the outer portion of the drilling part in a sleeving mode. The frame body structure moves in the same direction when the drilling part horizontally slides; the holding assembly is arranged in the frame body structure; the retaining mechanism with the sensing function is additionally arranged, the retaining mechanism provides whole-course middle radial constraint for the anchor rod, bending vibration in conventional drilling is restrained, the linear precision of hole forming is fundamentally guaranteed, meanwhile, a detection assembly integrated in the retaining mechanism can sense abnormal axial thrust force encountered by the anchor rod in real time, and the axial thrust force of the anchor rod can be detected in real time. When the drill bit is judged to be in contact with hard rock, hydraulic propulsion can be automatically suspended.

This utility model relates to the field of rapping dust removal technology, specifically to a side-impact rapping device capable of self-excited torsional vibration. The device includes a rapping rod body, a rapping hammer for generating bending vibration, and a key asymmetric inertial component. The asymmetric inertial component is rigidly fixed to the outer surface of the rapping rod body, and its center of mass is clearly offset from the central axis of the rapping rod body in the radial direction. When the rapping hammer strikes the rapping rod to induce bending vibration, the asymmetric inertial component, due to its inherent inertia, applies an instantaneous torsional torque around the central axis to the rod body during the bending motion. This torque passively excites torsional vibration as an excitation source, ultimately forming a bending-torsional composite vibration mode. This application, through the above solution, significantly improves the cleaning effect on stubborn dust accumulation in a simple, highly reliable manner without requiring an additional drive source.

The application discloses a kind of linear feeding device and method based on piezoelectric transducer inertia drive, feeding device includes base, first to fourth spring piece, first to second connecting block, piezoelectric transducer, top disc, piezoelectric bimorph, first to third stop piece, and M+N+P adjusting bolts;When working, sine excitation signal is applied to piezoelectric transducer, the second order longitudinal vibration mode of piezoelectric transducer can be excited, to induce the reciprocating bending vibration of spring piece, drive top disc to generate horizontal and vertical direction movement.Material placed in top disc moves forward and upward with top disc in material groove.When spring piece moves to limit position, elastic potential energy stored in spring piece drives top disc to move back, at this time, material continues to move forward and falls under the action of inertia in parabolic curve.Under this periodic motion, the transportation of material in top disc is realized.The application has simple structure, and is easy to process and assemble.

The utility model relates to a vibration absorber and a vehicle, the vibration absorber is used for attenuating the vibration of a transmission shaft, and the vibration absorber comprises a first mass block, a second mass block, an elastic piece and a connecting disc used for connecting the transmission shaft; the elastic piece comprises a first elastic part and a plurality of second elastic parts arranged at intervals in the circumferential direction of the connecting disc. The first elastic part wraps the periphery of the first mass block and is connected with the inner circumference of the connecting disc, so that the inner circumference of the connecting disc is connected with the first mass block through the first elastic part; the second elastic part is arranged between the inner periphery of the second mass block and the outer periphery of the connecting disc, and the outer periphery of the connecting disc is connected with the second mass block through the second elastic part. Bending vibration and torsional vibration of the transmission shaft can be attenuated at the same time, so that vibration of the transmission shaft is greatly eliminated, kinetic energy loss is reduced, the transmission shaft can transmit more kinetic energy, and the working efficiency of the transmission shaft is improved.

The invention relates to a gas storage injection-production well completion pipe string transverse vibration analysis method and device. The method comprises the steps of determining kinetic energy of an infinitesimal section of a well completion pipe string in a transverse bending vibration process and total potential energy of the well completion pipe string according to the cross sectional area of the well completion pipe string, the mass of the well completion pipe string per unit length, the flexural rigidity of the well completion pipe string, parameters related to fluid flowing through the well completion pipe string and pressure borne by the well completion pipe string; according to the kinetic energy of the infinitesimal section of the well completion pipe string in the transverse bending vibration process, the total potential energy of the well completion pipe string and the boundary conditions of the well completion pipe string, a transverse fluid-solid coupling vibration equation of the well completion pipe string is constructed; solving to obtain the inherent frequency of each order; and the string vibration frequency corresponding to the gas injection and production is simulated, and the critical gas production and gas injection of the completion string are determined. According to the method, the damage of transverse vibration to the injection-production well completion pipe string is reduced through injection-production measures for avoiding resonance gas flow, and the method has important significance on transverse vibration diagnosis and evaluation of injection-production well completion pipe string operation.

The invention relates to a low-frequency magnetoelectric sensor probe based on a high-order bending mode, a preparation method and a low-frequency magnetoelectric sensor, and belongs to the technical field of low-frequency magnetic sensors. The low-frequency magnetoelectric sensor comprises an elastic base, a serpentine spring and a main beam which are integrally formed; the whole elastic base is of a flat cuboid frame structure, a main beam is arranged in the elastic base, the two ends of the main beam are elastically connected with the elastic base through serpentine springs respectively, and therefore the main beam can generate high-order bending vibration when being excited; a magnetostriction layer is arranged on the upper side face of the main beam, and a piezoelectric sensing layer is arranged on the lower side face of the main beam. The two ends of the main beam of the probe are elastically connected with the elastic base through the serpentine springs respectively, and compared with a traditional cantilever beam structure, the loss is lower, the detection capacity is higher, the probe is not prone to damage in the industrial environment with strong vibration or strong magnetic impact, the structural strength is high, and the stability of long-term service is good.

The invention discloses a multi-dimensional vibration platform with four sandwich type piezoelectric actuators uniformly distributed on the periphery and arranged in a coplanar manner and an excitation method, relates to the field of high-frequency vibration engineering and micro-nano control, and solves the problems that the axis of the existing piezoelectric actuator is generally perpendicular to the plane of the platform, namely along the X axis, so that the structure is not flat, Y / Z-direction translation must be realized depending on longitudinal vibration, and the working efficiency is low. And the potential of the bending vibration mode in multi-degree-of-freedom excitation cannot be brought into full play. The platform comprises a tail end platform body, four flexible hinges and four actuating units, the four actuating units are symmetrically distributed on the outer edge of the tail end platform body at equal intervals by 90 degrees, the vibration axes of the actuating units are located in the same horizontal plane, and the X-Y plane, the Y-Z plane and the Z-X plane of the actuating units are symmetrical. The platform excites all six degrees of freedom through a bending vibration mode, and longitudinal vibration is only used as a selectable enhancement path of Y / Z-direction translation. The flexible hinge is connected with the tail end platform and the amplitude-change pole, transmits multidirectional bending deformation and inhibits unexpected rigid body displacement. The method is suitable for the fields of precise micromachining, micro-robots, biological microoperation and the like.