319 results about "Axial vibration" patented technology

The invention discloses a nickel-based alloy additive manufacturing method for high-frequency ultrasonic dynamic forging printing. The method comprises the steps that nickel-based alloy powder and a base plate are pretreated; scanning the nickel-based alloy powder layer by layer through laser to form a molten pool; in the machining process of each layer, when the temperature of the molten pool ranges from 1000 DEG C to 1400 DEG C, ultrasonic waves are activated to generate compound vibration; the composite vibration comprises axial vibration and transverse vibration; when the ultrasonic vibration phase difference reaches a preset first interval, short pulse laser is triggered; the ultrasonic vibration phase difference is a phase deviation between an ultrasonic vibration waveform and a pulse laser shock triggering moment; and until all layers are machined, a formed part is obtained. According to the scheme, the dislocation density is improved, secondary grain refinement and bubble escape are achieved, and interlayer stress redistribution is made uniform.

The invention relates to a damping spring device suitable for industry or life, in particular to a magnetic damping spring. The magnetic damping spring comprises a supporting cylinder, a force guiding piston, a force guiding piston blocking piece, a supporting rod and two or more magnets. The force guiding piston blocking piece is arranged on the upper portion of the supporting cylinder. The supporting cylinder is of a cylindrical structure, one end of the supporting cylinder is sealed and is a bottom surface, and the other end is of an opening structure for the supporting rod to penetrate; the lower end of the supporting rod penetrates through the force guiding piston blocking piece to be connected with the force guiding piston, and the upper end extends out of an opening in the upper end of the supporting cylinder. A groove is formed in the inner bottom surface of the supporting cylinder, and a magnet A is placed in the groove; a groove for placing the magnet B is formed in the lower bottom surface of the force guiding piston; the supporting rod can conduct resultant force of vertical vibration generated by axial vibration, horizontal vibration and vertical vibration to the force guiding piston, the force guiding piston drives the magnet B to extrude downwards to generate repulsive force which is gradually increased with the distance space of the magnet A, the repulsive force is used for buffering vertical vibration force conducted by the force guiding piston, and therefore the damping effect is achieved.

The invention relates to the technical field of tunnel blasting vibration monitoring, in particular to a tunnel blasting vibration monitoring and early warning integrated system based on lining crack conditions. According to the method, blasting vibration characteristic data are extracted from triaxial vibration signals of different key points in the tunnel blasting process, correlation analysis is carried out on the blasting vibration characteristic data and vibration characteristic data of corresponding reference points to judge the relevance between blasting vibration and crack response, and accurate judgment on the relation between blasting vibration and lining cracks is achieved; when blasting vibration and crack response have relevance, a dynamic safety threshold value is determined according to the lining crack health degree before tunnel blasting, and the dynamic safety threshold value is compared with vibration characteristic data in real time to trigger graded early warning; when blasting vibration and crack response are not correlated, the change rate of crack characteristic data is analyzed through comparison of lining crack conditions in multiple periods, the autonomous extension risk of cracks is predicted, reinforcement early warning is triggered, timely and reliable guarantee is provided for tunnel construction and operation safety, and lining cracks are effectively prevented from deteriorating.

The invention discloses a method, a system, a medium and equipment for quickly judging the axial stability of an external short-circuit winding of a power transformer. In the method, a power transformer winding axial vibration calculation model is established; through changing a short-circuit current amplitude, a cushion block stress-strain curve characteristic value and a pre-tightening force, a critical condition of separation of a wire cake and a cushion block of a winding is obtained, and a three-dimensional map of a wire cake-cushion block vibration separation critical state is drawn. An axial stability analysis system when the power transformer is subjected to external short-circuit impact in an operation state is constructed, a computer is deployed locally to operate a calculation instruction corresponding to the method, and a short-circuit current peak value is extracted according to a current recording diagram of the power transformer under an external short-circuit fault; and determining a fault point location in the three-dimensional atlas according to the actual pre-tightening force of the winding and a cushion block stress-strain curve, and quickly judging the axial stability of the external short-circuit winding according to the relative relationship between the fault point location and a critical state interface.

The invention provides a method and equipment for calculating hysteresis loss of an axial electromagnetic bearing, and belongs to the technical field of hysteresis loss calculation. The method comprises the following steps: establishing an equivalent magnetic circuit model; under the condition of axial vibration of the thrust disc, magnetomotive force is calculated, and total dynamic magnetic flux is determined through an equivalent magnetic circuit model; establishing a quantitative relationship between any two of the maximum magnetic flux density amplitude, the magnetic hysteresis loss and the angle parameter representing the magnetic hysteresis effect; taking magnetomotive force as magnetic field excitation, taking total dynamic magnetic flux as magnetic field response, and constructing complex permeability based on a quantitative relation; updating the equivalent magnetic circuit model by using the complex permeability; solving the maximum magnetic flux density amplitude of each region of the iron core under the dynamic working condition through iterative calculation; calculating the hysteresis loss of each region based on the quantitative relation and the maximum magnetic flux density amplitude of each region; and the total magnetic hysteresis loss is calculated. Based on the method, the invention further provides calculation equipment for the hysteresis loss of the axial electromagnetic bearing. According to the method, the hysteresis loss of the axial electromagnetic bearing under the dynamic operation condition can be accurately calculated.

The invention discloses a magnetic nanoparticle concentration distribution inversion method and a related device, and relates to the technical field of biomedical engineering.The method comprises the steps that firstly, magnetic nanoparticles in biological tissue are excited through an external magnetic field to generate infinitesimal displacement; and then ultrasonic equipment is adopted to collect ultrasonic ultrafast plane wave imaging data and carry out axial vibration displacement detection, axial vibration displacement actual measurement data and corresponding discrete space and time coordinates are input into the inversion model for iterative inversion, and a magnetic nanoparticle concentration distribution inversion result is obtained. A loss function of the inversion model includes a data-driven loss item and a physical information-driven loss item (based on a Navie equation). Compared with the prior art, the method has the advantages that the physical information neural network is introduced, control equations such as a nano-dimension equation and the like are encoded to the full-connection neural network, physical equations do not need to be excessively simplified, complex and time-consuming modeling for an experimental environment is not needed to obtain simulation data, and higher accuracy and stability are achieved.

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 relates to the technical field of medical apparatuses and instruments, and provides a portable electric vibration micro fracture device which comprises a holding part, one end of the connecting rod assembly is connected with the holding part; the first end of the bent connector is detachably connected with the end, away from the holding part, of the connecting rod assembly, the second end of the bent connector is provided with an execution piece used for bone tissue punching, the interior of the bent connector is detachably connected with an axial vibration driving piece, and the axial vibration driving piece acts on the execution piece and is used for driving the execution piece to reciprocate in the axial direction of the axial vibration driving piece; the power supply assembly is embedded in the holding part and is electrically connected with the vibration driving assembly; the elbow connector and the connecting rod assembly are detachably connected, elbow connectors with different bending angles can be rapidly and conveniently replaced, and the operation requirements of different crowds are met; the axial vibration driving part can drive the executing part to do reciprocating motion in the axial direction, progressive punching is achieved through stable axial vibration, the risk caused by out-of-control operation force can be greatly reduced, and the operation safety is improved.

The invention discloses an ultrasonic vibration auxiliary electrochemical mechanical thinning method and device for a large-diameter wafer, and belongs to the technical field of large-diameter semiconductor wafer thinning, and the device comprises a grinding system, an electrochemical system and an electrolyte circulating system. The grinding system comprises a micro-feeding unit, a main shaft rotating unit and an ultrasonic vibration unit, and the main shaft rotating unit and the ultrasonic vibration unit drive the cup-shaped grinding wheel to rotate and axially vibrate. The electrochemical system takes a cup-shaped grinding wheel as a cathode and a wafer as an anode, and an electrolyte is supplied between the cathode and the anode to generate electrochemical reaction. In the thinning process, the surface of the wafer is subjected to anodic oxidation modification to generate a modification layer easy to remove, meanwhile, the generated modification layer is removed by the grinding wheel, the grinding wheel with ultrasonic vibration facilitates chip removal and heat dissipation, circulation of electrolyte can be enhanced, and then the electrochemical modification effect is improved; the annular structure of the grinding wheel has better removal uniformity under the vibration condition, and efficient, high-precision and low-damage large-diameter wafer thinning can be achieved.

The invention discloses a drill rod signal transmission monitoring control method, which comprises the following steps: capturing drill rod axial vibration waveform and peripheral magnetic field vector change data in real time, analyzing and marking potential resonance frequency points, calculating magnetic field intensity break variable, and judging a geomagnetic anomaly region; determining the relevance between a resonance frequency point and geomagnetic mutation through time alignment processing, and separating and coupling interference signals; generating an anti-phase damping wave according to the resonance frequency point, dynamically adjusting the amplitude, and injecting a pre-compensation phase to counteract carrier offset; the signal-to-noise ratio and the phase error after suppression are calculated in real time, and a parameter readjustment process is triggered to ensure the suppression effect; when the rock drilling vehicle enters a new rock stratum, parameters are automatically recorded and updated to adapt to different rock stratum interference characteristics; the drilling stability and the signal quality are obviously improved, and the equipment loss and the maintenance cost are reduced.

The invention relates to a distributed optical fiber micro-seismic sensing device and a tunnel monitoring method, and belongs to the technical field of micro-seismic monitoring, the distributed optical fiber micro-seismic sensing device comprises a plurality of vibration measurement sensitization assemblies installed on the same tunnel section, and the plurality of vibration measurement sensitization assemblies are connected through distributed sensing optical cables; distributed sensing optical cables in the vibration measurement sensitization assembly are arranged in the radial direction of the tunnel and used for monitoring vibration signals of hidden and micro crack development of surrounding rock near the tunnel face in the radial direction. During monitoring, the vibration measurement sensibilization assembly at the head end or the tail end of the distributed optical fiber microseismic sensing device is sequentially connected with the distributed optical fiber demodulator, the monitoring host and the monitoring center to form a microseismic sensing monitoring network. The method for monitoring the tunnel by adopting the distributed optical fiber micro-seismic sensing device can realize the axial and radial sensing of the vibration signal, and overcomes the defect that the distributed sensing optical fiber is only sensitive to the axial vibration signal but not sensitive to the radial vibration signal.

The invention discloses a fault diagnosis system for an aviation turboshaft engine, and relates to the technical field of fault diagnosis. An acquisition module acquires horizontal, vertical and axial vibration signals; the processing module is used for generating real-time feature vectors by introducing dynamic short-time Fourier transform, variational mode decomposition and singular value decomposition of an unfixed-width Gaussian window; the incremental diagnosis module calculates the matching degree between a real-time feature vector or a prediction feature vector and a known class through a dynamic expansion network, selects to belong to the known class or triggers an expansion mechanism according to an adaptive resonance theory, constructs joint loss by using a Bayesian learning framework after expansion, and performs Gaussian process modeling; loss is determined through Bayesian optimization, and network parameters are updated; the prediction module generates a prediction feature vector when there is no fault; the maintenance module sends or stores a maintenance scheme according to needs, self-adaptive recognition of known classes and new fault classes is achieved, the state can be pre-judged in advance, the operation safety of the engine is effectively guaranteed, and the maintenance cost is reduced.

The invention discloses a hydraulic drive axial vibration chip breaking cutter handle and a vibration chip breaking method. The vibration chip breaking cutter handle comprises a power mechanism, a vibration mechanism and a torque transmission mechanism. The torque transmission mechanism comprises a shell assembly connected with a machine tool connecting handle. Cooling liquid of a machine tool serves as a power source, and the tool has the axial vibration chip breaking function and the cutting function during hole machining through an ingenious and simple mechanical structure; therefore, no extra power source needs to be added, any structure of the machine tool is not changed, the cost of a user is reduced, and use is simplified; the structural design of vibration chip breaking, torque transmission and the like is ingenious, the structure is simple, and compared with an existing hydraulic pulse type and piezoelectric ceramic driving type vibration chip breaking cutter handle, the vibration chip breaking cutter handle has the advantages in manufacturing cost and using cost; therefore, the device is simpler and more ingenious to use, is widely suitable for the hole machining industry, and has very important significance on deep development of the tool industry.

The invention discloses a synchronous decoupling measurement method for vibration displacement and blade top clearance of a shrouded blade, and relates to the field of energy power engineering, and the method comprises the following steps: 1, calibrating the axial vibration displacement and blade top clearance of the shrouded blade; step 2, installing an eddy current sensor; 3, the rotor is made to operate normally, the vibration state of the shrouded blade is measured in the rotating process of the shrouded blade, and a measurement signal is obtained; step 4, carrying out preprocessing on the measurement signal; 5, the sensing area variation of the sensor and the measurement distance variation from the sensor to the shroud are measured; and 6, calculating the vibration displacement and the blade top clearance of the shrouded blade. According to the method, the defects of the prior art can be overcome, synchronous and decoupling measurement on the vibration displacement and the blade top clearance of the shrouded blade can be realized, the measurement accuracy and credibility can be effectively improved, and the measurement requirement can be effectively met.

The invention discloses a magnesium-rare earth alloy with a grinding tooth-shaped interface structure and a preparation method and application thereof, and belongs to the technical field of magnesium alloy material processing. According to the magnesium-rare earth alloy with the meshed tooth-shaped interface structure, a W phase is directionally separated out around the boundary of an Al2 (Gd, Y) phase. The Mg-Gd-Y-Zn-Al alloy serves as a base, a high-modulus Al2 (Gd, Y) phase is introduced, directional precipitation of a W phase around the boundary of the Al2 (Gd, Y) phase is achieved through multiple times of ultrasonic vibration composite multi-axial vibration coupling and secondary solution treatment, the Al2 (Gd, Y) phase with a tooth-shaped microcosmic interface structure is constructed, compatible deformation with a magnesium matrix is achieved, the Al2 (Gd, Y) phase is refined through composite deformation machining, stress concentration is relieved, and the mechanical property of the alloy is improved. And meanwhile, the strength and plasticity of the alloy are improved through torsional deformation of the LPSO phase. Through the formation of the special microstructure, the high strength, the high modulus and the high ductility of the magnesium-rare earth alloy are synchronously improved.

Provided is an electro-acoustic transducer capable of maintaining stable performance. An electro-acoustic transducer (1) for transmitting vibrations to a bone is provided with: a main frame (10) having at least a cylindrical section; a vibration unit (30) that is disposed on the inside of the main frame and vibrates in the axial direction of the main frame in accordance with an input signal; and an elastic member (20) that is connected to at least the vibrating part and is formed from an organic material or a polymer material.

The motor support comprises an annular body, at least two supporting legs and at least two first arc-shaped flanging portions, the annular body is provided with a first face and a second face which are oppositely arranged, at least parts of the supporting legs are located on the side where the first face is located, and the first arc-shaped flanging portions are located on the second face. The first arc-shaped flanging parts are at least partially located on the side where the second face is located, and the at least two first arc-shaped flanging parts and the annular body are enclosed to form a containing part. According to the motor support provided by the utility model, based on the arrangement of the first arc-shaped flanging part, when the motor support is applied to a damping assembly and is connected with a motor, the elastic pad can be arranged in the accommodating part, so that radial vibration generated by the motor is effectively counteracted, and part of axial vibration generated by the motor can be dispersed to the radial direction so as to counteract the axial vibration; the situation that vibration generated in the operation process of the motor is transmitted to the volute through the supporting legs, and then noise is increased is avoided. In this way, the damping effect is improved, and noise is reduced.

The application discloses an intelligent real-time rock stratum inversion identification method based on a while-drilling parameter feature, which comprises the following steps: simulating drilling tests on different kinds of rock samples on an indoor drilling machine test platform, collecting while-drilling parameters in the drilling process of the rock mass by means of installing sensors on the drilling machine, performing time-frequency analysis and processing on the collected drill rod axial vibration signals and training, so as to obtain an artificial neural network model for identifying rock strata; inputting the collected while-drilling data into the trained artificial neural network model on a drilling operation site, and outputting identification results of the interface and lithology types of the drilled rock strata in real time by the artificial neural network model, so as to classify the stratum geology and rock-soil bodies, and the drilling parameters and path can be adjusted in time by the staff according to the while-drilling rock stratum identification results in the drilling process, which is favorable for guaranteeing the drilling quality, improving the drilling efficiency and saving a large amount of manpower and material resources.

The invention belongs to the technical field of wall insulation materials, and provides a flame-retardant wall insulation board and a production process thereof. According to the invention, a composite matrix is constructed through a polyurethane prepolymer and bisphenol A epoxy resin, and an interpenetrating network is formed by crosslinking an epoxy group and isocyanate, so that the mechanical strength is improved; and a quaternary flame-retardant system coated with silica sol is adopted, so that gas phase-condensed phase synergistic flame retardance is realized. According to the preparation process, step curing is combined with axial vibration to promote filler arrangement, cell collapse is avoided, low-temperature ultrasonic dispersion guarantees uniform mixing of the nano filler, and the interface adhesion is enhanced through the correlative design of the embossing depth and the plate thickness. The flame retardant property of the obtained product reaches the V-0 level and far exceeds the requirement of the national standard B1 level, the heat conductivity coefficient is superior to that of mainstream products in the market, and the product has excellent heat preservation and heat insulation performance and high safety and has remarkable application value in the field of building heat preservation.

The present invention provides a multi-directional vibration identification fault-tolerant sensor, comprising a housing, a slider, a stopper, and a plurality of side blocks; the upper portion of the slider is connected to the top of the housing via a first elastic member, the side of the slider is provided with a plurality of first nanomaterial friction layers spaced apart, and the first nanomaterial friction layers are inclined; the stopper is fixedly provided below the slider; each side block is connected to the stopper via a second elastic member, the upper end of each side block is provided with a first metal electrode inclined, each first metal electrode is fitted with a first nanomaterial friction layer, the outer wall of each side block is provided with a second nanomaterial friction layer, and a second metal electrode is provided on the inner wall of the housing at a position opposite to each nanomaterial friction layer. The present invention has the following beneficial effects: the frequencies of axial vibration and lateral vibration are measured simultaneously, and the cooperation of the stopper, the side block, and the second elastic member isolates the axial vibration from the lateral vibration, thereby reducing the overall measurement error.

The application provides a frozen and thawed rock stratum blasting hole dynamic optimization drilling method, rock mass vibration is excited, vertical direction vibration data of an undrilled hole area on the ground and axial vibration data of a drilled hole area are collected, and a multi-source vibration data set is constructed; based on the data set, a rock mass structure characteristic reconstruction algorithm is applied to dynamically represent internal defect distribution and structure strength parameters, three-dimensional space coordinates of a subsequent to-be-drilled hole position and optimal drilling path instructions are generated, and the instructions are issued to a drilling control system; data of a positioning module and a navigation module are fused to monitor a drilling tool pose, a three-dimensional motion trajectory is constructed, an optimal obstacle avoidance path is dynamically planned according to the instructions, a drilling pose adjustment strategy containing a drill rod flexural deformation compensation amount is generated, and the drilling pose adjustment strategy is output to an adaptive trajectory adjustment mechanism; the drilling tool is driven to drill along the obstacle avoidance path, the mechanism is used for real-time regulation and control of a drilling trajectory deflection angle and a feed rate, the drilling tool motion trajectory is ensured to dynamically coincide with the target path, drilling precision is improved, and the risk of drilling tool jamming is reduced.

To provide a piezoelectric actuator which suppresses a flow-out of fine dust from the inside of the piezoelectric actuator to the outside, and a manipulation system.SOLUTION: A piezoelectric actuator 30 comprises: a housing 32; rolling bearings 342 and 343 disposed inside of the housing 32; a shaft part 344 which is inserted through the rolling bearings 342 and 343 in an axial direction A and protrudes from a tip end opening 323a of the housing 32 to a tip end side A1 in the axial direction A; a tool holder 35 which is fixed to the shaft part 344 and capable of holding a micro tool; a vibration part 33 which is disposed inside of the housing 32 and capable of vibrating the rolling bearings 342 and 343, the shaft part 344 and the tool holder 35 in the axial direction A; and a tip end sealing member 37b which is provided in the tip end opening 323a and in contact with the shaft part 344 and the housing 32 in a radial direction D of the rolling bearings 342 and 343.SELECTED DRAWING: Figure 3

The invention belongs to the technical field of fan production tools, and particularly relates to an intelligent fan conveying end cover tool which comprises a tool body used for horizontally fixing a workpiece, and the tool body comprises a base and a plurality of locking supporting mechanisms arranged on the top face of the base at intervals to evenly support the workpiece. The locking and supporting mechanism comprises a first locking and supporting assembly and a second locking and supporting assembly adjacent to the first locking and supporting assembly, and the first locking and supporting assembly and the second locking and supporting assembly generate locking force on the two ends of the workpiece in the direction perpendicular to the horizontal direction. A balanced clamping force field is formed between the two ends of the workpiece. By means of the locking and supporting mechanism formed by the first locking and supporting assembly and the second locking and supporting assembly, opposite locking force can be formed at the upper end and the lower end of the workpiece correspondingly, so that a balanced clamping vertical field is provided, the workpiece can be fixed, meanwhile, axial vibration generated by the workpiece can be reduced, and the machining precision is improved.

The invention belongs to the field of processing equipment, and discloses an amplitude closed-loop adjustable mechanical low-frequency vibration generation device, which comprises a variable amplitude vibrator, a vibration feedback device, an amplitude adjusting device and a control end, and is characterized in that the variable amplitude vibrator comprises two groups of structures capable of generating same-frequency axial vibration; each group of vibration generation structure comprises a wave-shaped roller path, a rolling body and a plane roller path; the amplitude adjusting device changes the relative angle positions of the wave-shaped raceways of the two groups of axial vibration devices in the amplitude-variable vibrator in an electric driving manner, so that the phase difference of the two groups of axial vibration is changed, and the amplitude of the synthesized axial vibration is adjusted; the vibration feedback device can monitor the output amplitude of the variable-amplitude vibrator in real time and feed back the output amplitude to the control section, and closed-loop precise control over the output amplitude by the control section is achieved. According to the device, axial low-frequency vibration is overlaid while the main shaft does feeding motion, discontinuous cutting is achieved, and metal cuttings can be effectively broken off. And meanwhile, the vibration amplitude can be changed in the drilling process so as to meet various machining requirements.

The utility model provides a shock absorption assembly, motor assembly and range hood, including shock absorption piece and connecting piece, shock absorption piece is attached to connecting piece, shock absorption piece is equipped with convex part, connecting piece is equipped with accommodation groove, convex part is at least partially embedded in the accommodation groove. According to the damping assembly provided by the utility model, as the convex part is at least partially embedded in the accommodating groove, when the damping assembly is applied to the motor assembly, through the interaction of the convex part and the inner surface of the accommodating groove, on one hand, the axial vibration and the radial vibration of the motor can be effectively counteracted, so that the damping effect is well achieved; and on the other hand, the installation of the damping piece can be limited, and the problem that the damping effect is reduced due to the fact that the damping piece deviates between the motor and the connecting piece is solved.

The invention discloses a helical gear rack transmission system fault diagnosis method based on multi-axis vibration signals. The method comprises the following steps: acquiring a high-fidelity health signal; injecting fault features on the basis of the high-fidelity health signal to obtain a single-axis simulation signal; according to the generated single-axis simulation signals, a three-axis signal matrix is constructed through amplitude scaling and random disturbance, and the three-axis signal matrix comprises radial vibration signals, tangential vibration signals and axial vibration signals; performing feature extraction to obtain a multi-dimensional feature vector corresponding to each axis; fusing the multi-dimensional feature vectors to construct a sample set, and training a support vector machine model by using the sample set to obtain a fault diagnosis model; and gear rack fault diagnosis is realized by using the fault diagnosis model. According to the method, the problem of insufficient actual sampling data can be solved, the coupling information of the three-axis signals is fully utilized, the small sample advantage of the SVM is combined, high-precision recognition of various faults of the bevel gear rack transmission system is achieved, and the method has good engineering applicability and popularization value.

A method for displacing a tubular string in a wellbore can include axially vibrating the tubular string at a surface location, and reducing friction between the tubular string and the wellbore due to the axially vibrating. The axial vibration may be imparted by operation of an injector assembly. The axial vibration may be imparted by operation of a vibration tool connected between the injector assembly and a wellhead or a support structure that suspends the injector assembly. The axial vibration may be imparted by varying a flow rate of fluid into the tubular string.

The invention relates to the technical field of motor performance test equipment, in particular to performance simulation and test equipment and method for a dual-redundancy motor, and the performance simulation and test equipment for the dual-redundancy motor comprises a base, a mounting frame, a vibration ring, a torque detection unit and a connection socket. The connection socket is fixedly connected with a buckle, the connection socket is provided with a connection interface which is in circuit connection with a detected motor, and the torque detection unit is connected with a rotor of the detected motor and detects the output torque of the detected motor; vibration generated by the radial vibration motor and the axial vibration motor on the vibration ring is transmitted to the mounting ring and the dual-redundancy motor, the vibration of the dual-redundancy motor in the running process when the dual-redundancy motor is mounted on an automobile is simulated, and the position and angle of the vibration transmitted to the dual-redundancy motor are changed by rotating the transmission rod. Therefore, the performance simulation test effect of the invention is improved.

The application provides a damping foot pad, a compressor and a refrigeration and heating device. The damping foot pad comprises a shell with an inner cavity, a shaft core, a sheet spring, an eddy current damping mechanism for damping axial vibration of the shaft core, and a magnetic damping mechanism; the magnetic damping mechanism comprises an inner magnetic ring and an outer magnetic ring for generating magnetic repulsion to the inner magnetic ring in the direction of the shaft core. The damping foot pad of the application damps the axial vibration of the shaft core by setting the eddy current damping mechanism, sets the inner magnetic ring on the shaft core, and sets the outer magnetic ring coaxially around the inner magnetic ring. Since the eddy current damping mechanism and the magnetic damping mechanism have very small stiffness close to zero at the start of vibration, quasi-zero stiffness damping is formed, the axial and radial vibration isolation frequency ranges of the damping foot pad are wide, good axial and radial vibration isolation can be achieved, and the vibration isolation effect is good.

The application discloses a handheld ultrasonic cutting device and belongs to the technical field of cutting equipment. The handheld ultrasonic cutting device comprises a cutter body, an annular protrusion is arranged on the outer periphery of the cutter body at the position of the minimum axial vibration value, two interference fit flange rings are arranged on the outer periphery of the annular protrusion, and the flange rings are in clearance fit with the annular protrusion; a transducer is connected with the cutter body, the transducer is used for converting electric energy into mechanical vibration, and the mechanical vibration is transmitted to the cutter body so that the cutter body can cut; a sleeve is arranged on the outer side of the cutter body and the transducer, the shape of the sleeve matches the shape of the whole after the cutter body and the transducer are connected, one end of the sleeve is fixed on the end of the transducer which is not connected with the cutter body, and the other end of the sleeve is clamped on the outer periphery of the flange ring. The beneficial effect is that the cutter body can be prevented from swinging during cutting, and the cutting effect is better.