22 results about "Magnetostrictive actuator" patented technology

The present invention discloses a high-frequency, high-flow fuel regulating valve and a control method thereof. The high-frequency, high-flow fuel regulating valve comprises a valve body, a valve core, a valve sleeve, a multi-dimensional discrete magnetostrictive actuator, and a voice coil motor. The valve core and valve sleeve are both movable and jointly determine the valve opening. The voice coil motor drives the valve sleeve to achieve large-stroke control of the valve and perform low-frequency average flow regulation. The multi-dimensional discrete magnetostrictive actuator drives the valve core to achieve small-stroke control of the valve and perform high-frequency transient flow regulation. The multi-dimensional discrete magnetostrictive actuator utilizes an induction coil to achieve closed-loop position control and a temperature sensor to achieve thermal error compensation. The voice coil motor utilizes an eddy current displacement sensor to achieve closed-loop position control. The present invention is applicable to the field of active combustion control of aircraft engines and can simultaneously meet the requirements of aircraft engines for suppressing high-frequency combustion oscillations and regulating low-frequency average fuel flow.

The invention discloses a magnetostrictive actuator displacement determination method, device and equipment, a medium and a product, and relates to the field of magnetostrictive actuators, and the method comprises the steps: determining the output displacement of a magnetostrictive actuator through an output displacement model according to an input current, a GMM rod parameter and a coil parameter; the determination method of the output displacement model specifically comprises the following steps: acquiring a test input current, a test GMM rod parameter and a test coil parameter of the magnetostrictive actuator; determining the magnetization intensity of the GMM rod based on a spatial non-uniform magnetic field model according to the test input current and the test GMM rod parameters; determining temperature distribution by using an equivalent thermal network model based on an equivalent thermal resistance principle according to the test GMM rod parameters and the test coil parameters; and constructing an output displacement model according to the magnetization intensity and temperature distribution of the GMM rod based on the influence of the temperature on the magnetostrictive effect and the thermal expansion displacement. According to the invention, the calculation precision of the output displacement of the magnetostrictive actuator can be improved.

The invention relates to the field of deep machining of cutting blades, and provides an artillery barrel deep hole machining method and device based on a magnetostrictive actuator, and the machining method comprises the steps that multi-source data sensing network systems are installed on a boring rod, a cutter and an artillery barrel respectively; processing a multi-source signal acquired in real time, and extracting time-frequency information in an acoustic emission signal and a vibration signal; according to the characteristics of artillery barrel deep hole machining, a tool wear prediction model is established; inputting the time-frequency information into a tool wear prediction model to obtain a current signal of a control system; and a current signal is input to the coil to control the stretching of the magnetostrictive element, so that the cutter and the artillery barrel are kept in a contact state, and the fine adjustment of the displacement of the cutter is realized. The machining device comprises a spindle box, a guide rail, a boring rod assembly, a cutter and a floating support. The problem that dynamic characteristics of the large-length-diameter-ratio boring rod are affected by tool abrasion and time-varying excitation is solved, and the precision requirement of artillery barrel deep hole manufacturing is met.

The invention discloses a modeling method and system for a load-related giant magnetostrictive actuator. The modeling method comprises the steps that multi-dimensional data of the giant magnetostrictive actuator under different load working conditions are acquired and preprocessed; a threshold function and a weight coefficient function of a Play operator in the classic PI model are improved, a Sigmoid function is introduced into the Play operator, and an initial improved PI model is obtained; and identifying parameters to be determined in the initial improved PI model based on a particle swarm optimization algorithm and the preprocessed multi-dimensional data to obtain a final improved PI model. According to the modeling method of the load-related giant magnetostrictive actuator, the hysteresis nonlinearity of the actuator can be described, the output displacement change generated by the load change can be reflected in real time, and a reliable theoretical basis is provided for accurate control and performance optimization of the giant magnetostrictive actuator under different load conditions.

The invention belongs to the technical field of prostheses, and particularly relates to a magneto-rheological magnetostrictive composite actuator of a bionic prosthetic knee joint, which comprises a hydraulic actuating component, a force sensor is arranged on the hydraulic actuating component, the hydraulic actuating component is connected with a magneto-rheological fluid pump through a guide pipe, the magneto-rheological fluid pump is connected with a controller, and the controller is connected with the magneto-rheological fluid pump. According to the device, the current of the first magnetorheological valve and the current of the second magnetorheological valve are adjusted through the controller, meanwhile, the magnetorheological fluid pump cooperates with the magnetostrictive actuator, a semi-active mode and an active mode can be rapidly switched, the ligament loosening and tightening state is simulated, and the ligament can be rapidly controlled. The mechanical requirements of walking and standing scenes are met, the knee joint is actively driven to bend and stretch, the muscle contraction characteristic is reproduced, switching of a semi-active mode and an active mode can be achieved without an external motor, the structure is compact, and the problems of space occupation and weight of a traditional scheme are solved.

The application relates to the technical field of vibration generating devices, in particular to a micro acceleration generating device based on a magnetostrictive effect, which comprises a shell base, a magnetostrictive actuator, an inner shell base, a work platform, bottom and side vibration isolation springs, a guide assembly, a standard vibration sensor and a control module; the bottom vibration isolation springs are connected with the inner shell base and the shell base respectively, and the side vibration isolation springs are connected with the side walls of the inner and outer shell bases respectively; the magnetostrictive actuator is arranged in the inner shell base, the output rod upper end of the magnetostrictive actuator is in abutment with the work platform, and the standard vibration sensor is installed on the top end of the work platform installation part; the inner ring of the guide assembly is connected with the flange part, and the outer ring is connected with the inner shell base. The device can drive micro vibration with large current by using the characteristics of small displacement and large thrust of the magnetostrictive material, can eliminate electric noise interference, can guarantee high signal-to-noise ratio, and can realize non-contact friction axial guidance through elastic micro deformation of the diaphragm spring, so that the work platform only moves in the vertical direction with single degree of freedom.

The invention relates to a plunger pump variable device capable of quickly responding and reducing pressure overshoot and a control method, the plunger pump variable device comprises a hydraulic amplification variable device connected with a swash plate, the hydraulic amplification variable device is connected with a giant magnetostrictive driver, and the plunger pump variable device further comprises a controller; the input end of the controller is connected with a temperature sensor, a pump oil outlet pressure sensor and a load pressure port pressure sensor, the temperature sensor is arranged on the giant magnetostrictive driver, and the output end of the controller is connected with the giant magnetostrictive driver. According to the plunger pump variable device capable of quickly responding and reducing the pressure overshoot and the control method, the output displacement of the giant magnetostrictive actuator is accurately controlled by controlling the input current of the giant magnetostrictive actuator, and then the displacement of the swash plate can be accurately controlled by hydraulically amplifying the appropriate area ratio of a large piston and a small piston of the variable device; the response speed of the plunger pump is effectively increased, the pressure overshoot generated when the load pressure of the executing mechanism changes suddenly is reduced, and the response rapidity and the pressure stability of the plunger pump are further improved.

A feedback linearized sliding mode control method for hybrid vibration isolation of a supermagnetostrictive actuator and an air spring belongs to the field of electronic design modeling technology. To ensure precise control of the hybrid vibration isolation system of the supermagnetostrictive actuator and air spring, this invention considers the effects of eddy current loss, temperature effect, and prestress, establishes the relationship between the expansion rate of the supermagnetostrictive material and the magnetic field strength, and constructs the constitutive equation of the supermagnetostrictive actuator; it also establishes the dynamic equilibrium equation of the hybrid vibration isolation system of the supermagnetostrictive actuator and air spring; it uses a feedback linearized sliding mode control strategy to control the dynamic equilibrium equation of the hybrid vibration isolation system of the supermagnetostrictive actuator and air spring, obtaining the feedback linearized sliding mode control equation; based on the feedback linearized sliding mode control equation and the relationship between the expansion rate of the supermagnetostrictive material and the magnetic field strength, a control method for the hybrid vibration isolation system of the supermagnetostrictive actuator and air spring is constructed. This invention provides precise control.

The present invention discloses a modeling method and system for a temperature-dependent giant magnetostrictive actuator, and relates to the technical field of giant magnetostrictive actuator modeling. Specific steps include: establishing an improved PI model at an initial temperature T0; identifying parameters in the improved PI model through a genetic algorithm; substituting the identified parameters into the initial envelope function of the improved PI model, and adding an identification parameter c on the basis of the envelope function to obtain a first envelope function; using a genetic algorithm to select the input current and output displacement of the giant magnetostrictive actuator at different temperatures to separately identify the identification parameter c; substituting the value of the identification parameter c into the first envelope function to obtain an expression for the temperature model, and completing the modeling. The present invention establishes a new temperature-dependent giant magnetostrictive model, which, compared to the classical PI model, can accurately describe the relationship between the input current and output displacement of the giant magnetostrictive actuator under temperature changes.

This invention belongs to the field of laser technology and discloses a high-response-bandwidth grating external cavity control device and a frequency-stabilized laser system. The grating external cavity control device includes a grating holder, a magnetostrictive actuator, and a driving current source. The grating holder is used to set the grating, and the magnetostrictive actuator is used to drive the grating holder to rotate, thereby changing the grating angle and external cavity length of the laser grating. The magnetostrictive actuator includes a magnetostrictive rod, a fixed base, a permanent magnet, and a solenoid. One end of the magnetostrictive rod is fixed to the fixed base, and the other end serves as the free end of the magnetostrictive actuator. The solenoid is sleeved around the outer circumference of the magnetostrictive rod and is used to provide an axial magnetic field to the magnetostrictive rod under the drive of the current source. The permanent magnet is used to provide a bias magnetic field to the magnetostrictive rod. The frequency-stabilized laser system involves the specific structures of three feedback loops of two types: grating and current, and frequency-stabilized closed-loop loops for single-actuator and dual-actuator grating external cavity control devices, respectively. This invention improves the response bandwidth of the laser, which can greatly improve the linewidth and noise characteristics of the laser, and enhance its environmental adaptability and long-term stability.

This invention relates to the field of deep machining of cutting inserts, and provides a method and apparatus for deep hole machining of artillery barrels based on a magnetostrictive actuator. The machining method includes installing a multi-source data sensor network system on a boring bar, a cutting tool, and the artillery barrel; processing the real-time acquired multi-source signals to extract time-frequency information from acoustic emission and vibration signals; establishing a tool wear prediction model based on the characteristics of deep hole machining of artillery barrels; inputting the time-frequency information into the tool wear prediction model to obtain the current signal of the control system; and inputting the current signal into a coil to control the extension and retraction of the magnetostrictive element, keeping the cutting tool and the artillery barrel in contact, thereby achieving fine adjustment of the tool displacement. The machining apparatus includes a spindle box, guide rails, a boring bar assembly, a cutting tool, and a floating support. This invention solves the problem of tool wear and time-varying excitation affecting the dynamic characteristics of boring bars with large length-to-diameter ratios, meeting the precision requirements of deep hole manufacturing of artillery barrels.

The present application provides a display device comprising a display panel including a display area and a non-display area; a magnetostrictive actuator disposed at a position corresponding to the non-display area of ​​the display panel; the magnetostrictive actuator comprising a telescopic member, a first movable portion, and a second movable portion; in a static state, the first movable portion is disposed perpendicular to the telescopic member; and the second movable portion is disposed at an angle to the telescopic member. The actuator provided in the present application has a small dimension along the coil axis, conforming to the trend toward flatter display devices.

The utility model relates to the technical field of refiners, in particular to a refiner with a magnetic telescopic actuator. The refiner comprises a static grinding disc, a movable grinding disc, a main shaft assembly, a rotary driving part, an axial driving assembly, a displacement sensor and a magnetic telescopic actuator, the movable abrasive disc and the static abrasive disc are oppositely arranged, and a gap between the movable abrasive disc and the static abrasive disc is adjustable; the main shaft assembly comprises a main shaft body; one end of the main shaft body is connected with a movable abrasive disc, and the other end of the main shaft body is connected with the output end of the rotary driving part; the axial driving assembly is arranged on the main shaft assembly and used for driving the main shaft assembly to be in linkage with the main shaft body to drive the movable abrasive disc to get close to or get away from the static abrasive disc in the axial direction. One end of the magnetic telescopic actuator is rotatably connected with the axial driving assembly in an inserted mode, and the other end of the magnetic telescopic actuator is connected with the main shaft assembly. And the displacement sensor is arranged on the main shaft assembly. According to the utility model, the gap between the movable abrasive disc and the static abrasive disc can reach the set precision.

The application relates to a dynamic sealing structure of a downhole double-actuator giant magnetostrictive transducer, which dynamically seals the output rod of the giant magnetostrictive actuator from two aspects. One aspect is to prevent water from entering, rubber sleeves capable of fitting the output rod and the connecting ring in shape are arranged at both ends of the central through hole of the connecting ring, and a suitable adhesive is selected to bond the rubber sleeves on the output rod and the connecting ring, and the elastic rubber sleeves are used for dynamically sealing the output rod in axial reciprocating motion. Secondly, O-ring grooves are designed on the side wall of the central through hole of the connecting ring and the output rod, and the O-rings are respectively arranged in the grooves on the side wall of the central through hole of the connecting ring and the output rod in the form of being embedded or sleeved, and the O-rings are compressed and deformed through interference fit with the contact surfaces of the output rod and the connecting ring to prevent water from entering. The other aspect is water storage, the upper connecting ring and the lower connecting ring are manufactured by using a metal 3D printing technology, and the entering water is guided to the water storage groove through the drainage groove and the funnel-shaped drainage channel structure in the connecting ring.

The invention discloses a high-frequency magnetostrictive actuator output displacement self-sensing strategy and a real-time agent model, and the high-frequency output displacement of the actuator is solved through the displacement self-sensing real-time agent model based on the current of four groups of closed induction coils axially distributed in the actuator. And the displacement self-sensing real-time agent model extracts three detail coefficients and two approximation coefficients of each group of induction current sequences to form an input sequence with the length of 40 through a discrete wavelet transform algorithm on the basis of sequence values of four groups of induction current at five continuous sampling moments from the kth sampling moment. And an output displacement predicted value at the (k + 4) th sampling moment is calculated through the multi-layer perceptron network model, and the output displacement predicted value is averaged with the output displacement predicted values at the previous two sampling moments. And finally, processing through a low-pass filter to obtain an output displacement value at the (k + 4) th sampling moment, namely the output of the real-time agent model. The method is high in confidence coefficient and simple and safe to operate.

The invention discloses a space environment magnetostrictive actuator, which adopts an efficient thermal management scheme to ensure long-term stable operation of the actuator under the conditions of vacuum, high and low temperature circulation and extreme radiation. As the space environment lacks air convection heat dissipation, the system optimizes heat conduction between the magnetostriction rod and the coil framework through the high-heat-conduction non-magnetic filling material, the heat dissipation efficiency is improved, and magnetic field interference is avoided. The inner side of the shell is coated with the aluminum oxide coating, the infrared radiation heat dissipation capacity is enhanced, and heat can be effectively released to the outer space. In addition, the micro heat pipe phase change heat dissipation module and the thermoelectric refrigeration module are combined, active heat dissipation is achieved under the high-temperature working condition, and it is ensured that the actuator is always in the proper working temperature range. The magnetostrictive actuator has the advantages of efficient heat dissipation, low power consumption, light weight, high environmental adaptability and the like, is particularly suitable for satellite remote sensing, precise adjustment of space telescopes, micro-vibration suppression of spacecrafts and deep space exploration instruments, and can remarkably improve the reliability and stability of in-orbit long-term operation of the magnetostrictive actuator.

The invention discloses a magnetostrictive actuator position control method and system based on LSTM feed-forward inverse compensation and active disturbance rejection, and relates to the technical field of magnetostrictive actuators, and the technical scheme is characterized in that the nonlinear fitting capability of an LSTM network is utilized, a feed-forward compensation current is generated according to an expected trajectory, a feed-forward compensator is constructed, and the position of the magnetostrictive actuator is controlled; the problems of inherent nonlinear hysteresis and parameter uncertainty of the GMA are solved. Secondly, observing and suppressing external disturbance of the GMA, and designing an active-disturbance-rejection feedback controller; and finally, superposing the feedforward control signal and the feedback control signal to jointly drive the GMA to realize position tracking control. According to the method, non-linearity is eliminated through feedforward, disturbance is suppressed through feedback, the tracking precision, the response speed and the anti-interference capability of the GMA system are improved, and a basis is provided for development of the GMA.

The invention discloses a modeling method and system for a frequency-dependent giant magnetostrictive actuator. The modeling method comprises the following steps: firstly, establishing a classic PI model; then, a symmetric Play operator in the classic PI model is improved into an asymmetric Play operator, and an improved PI model is obtained; further introducing a frequency factor, representing part of parameters as a frequency function, and constructing a frequency-related improved PI model; the input current and output displacement data under different frequencies are utilized, a nonlinear optimization tool box is adopted for parameter identification, and model parameters are optimized. And finally, comparing the root-mean-square error and the mean absolute error of the model output and the actual output, and verifying the fitting precision of the model under different frequencies. According to the method, the asymmetric hysteresis characteristic and the frequency-dependent hysteresis characteristic of the giant magnetostrictive actuator can be accurately described within the frequency range of 1-90 Hz, and a more accurate theoretical basis is provided for modeling and control of the giant magnetostrictive actuator.

An active control method for reducing pipeline noise includes a silencer and a hydrophone on the pipeline. The silencer includes a magnetostrictive actuator, with a displacement amplification device connected to the vibrating head of the actuator. A piston is installed at the end of the displacement amplification device. When the magnetostrictive actuator is energized, the vibrating head reciprocates. The amplitude of the piston is greater than that of the vibrating head, and the reciprocating motion of the piston eliminates the primary sound wave generated by the water pump. The method also includes noise information acquisition, noise information feedback, and secondary sound wave adjustment. A current adjustment device adjusts the current driving the magnetostrictive actuator according to the initial current parameters, sets the secondary sound wave corresponding to the primary sound wave, and adjusts the current used to drive the magnetostrictive actuator so that the real-time sound pressure and real-time frequency collected by the hydrophone change to the noise control parameter level. Thus, the silencer parameters are constantly controlled according to the changes in pipeline noise when the water pump operation changes, achieving precise noise reduction.

The invention discloses a magnetostrictive actuator tracking control method and device, equipment, a medium and a product, and relates to the field of magnetostrictive actuators, and the method comprises the steps: obtaining the real-time current of a magnetostrictive actuator; according to the real-time current, based on a feedforward inverse model, determining an optimal compensation amount of a magnetic field by using an LSTM model and a Kalman filtering algorithm; the feed-forward inverse model is obtained by performing inversion on a kinetic model; the kinetic model is constructed based on the influence of eddy current and stress on magnetic field distribution according to the working principle of the magnetostrictive actuator; the dynamic model comprises a magnetic field intensity model, a hysteresis model, a magnetostriction model and a displacement output model; and compensating an output power supply of the magnetostrictive actuator according to the optimal compensation amount of the magnetic field to obtain output displacement. According to the invention, the tracking control precision of the output of the magnetostrictive actuator can be improved.

The present invention relates to the technical field of vibration measurement, and discloses a wireless energy transmission vibration sensor for generator mirror plate vibration monitoring, which includes a heat insulation and protection mechanism and a transmitting circuit module. Inside the heat insulation and protection mechanism, a collection mechanism, a wireless module, a receiving circuit module, a signal processing unit, and a magnetostrictive actuator are respectively arranged. The wireless module is arranged at the output end of the collection mechanism, and the receiving circuit module is respectively arranged at the input end of the wireless module and the input end of the signal processing unit. This wireless energy transmission vibration sensor for generator mirror plate vibration monitoring can control the resonance frequency through the magnetostrictive actuator during use. That is, relying on the characteristic that the magnetostrictive rod elongates or shortens in the magnetization direction when magnetized, the coupling capacitor is adjusted through the magnetostrictive actuator, and then the resonance frequency is adjusted, thereby achieving self-tuning and ensuring efficient transmission.

The invention discloses a mass flow control method, system and equipment based on a modified magnetic induction valve material, and belongs to the technical field of flow control corresponding to G05B. The method is applied to a flow control valve structure composed of a cavity double-circular-truncated-cone type valve body, a cylindrical valve element and the like, and a magnetostriction execution component material is modified in the modes of doping nano magnetic particles, directionally optimizing a crystal structure, locking a film through surface magnetic performance and the like; the cantilever beam is driven to bend and the valve element slides by utilizing the magnetic field telescopic characteristic of the modified magnetic induction sheet, and the coil current is dynamically adjusted by combining a flow detection feedback signal so as to regulate the opening degree of a valve port. The corresponding control system comprises a modified magnetic induction execution module, a valve body installation module, a magnetic field driving module and the like. The magnetic conductivity, the response sensitivity and the high-temperature stability of the magnetic induction material are remarkably improved, the magnetic hysteresis loss and the temperature drift are reduced, the flow control precision and the operation reliability are effectively improved in combination with the adaptive sealing structure design, and the applicable working condition range is widened.