7 results about "Magnetostrictive actuator" patented technology

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.

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.

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.

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 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.

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 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.