35 results about "Electromagnetic load" patented technology

The invention discloses a PINN prediction method for electromagnetic field distribution and mechanical response under an electromagnetic load of a superconducting block. The method comprises the following steps of: 1, establishing a PINN model for predicting the electromagnetic field of the bulk superconductor under the excitation of an external magnetic field by taking a coordinate point and a time point as input and magnetic field intensity and electric field intensity as output; 2, training the PINN model for predicting the electromagnetic field of the superconducting block under the excitation of the external magnetic field, achieving the distribution prediction of the electromagnetic field, and obtaining the prediction of the electromagnetic force; 3, establishing a PINN model for predicting the mechanical response of the bulk superconductor under the action of the electromagnetic force, wherein the coordinate point is used as input, and the displacement field is used as output; and step 4, training the PINN model for the mechanical response prediction of the bulk superconductor under the action of the electromagnetic force, and finally realizing the electromagnetic field distribution and mechanical response prediction of the bulk superconductor. The method can predict the electromagnetic field distribution of the superconducting block and the mechanical response under the electromagnetic force, and does not need grid division and a large amount of experimental data.

The invention discloses a hydro-generator stator stabilizing structure, which comprises a plurality of combined connecting units distributed along the circumferential direction of a stator core, and is characterized in that each combined connecting unit comprises an inner side connecting part embedded with an axial extending groove on the outer diameter side of the stator core, and an outer side connecting part embedded with an axial extending groove on the outer diameter side of the stator core; the outer side connecting part is inserted into a guide groove of a pull block fixed on the stator frame; a radial displacement compensation space is formed between the bottom of the guide groove of the pull block and the outer side connecting part; the two axial ends of the combined connection unit are provided with stop blocks in contact with the stator base, and the stop blocks are fixed through axial fasteners. By means of the combined constraint mode that axial segmented embedding of the combined connecting units is combined with radial guiding gaps, the problems of radial stress concentration and circumferential roundness instability caused by thermal deformation of the stator core of the large hydro-generator under the cold and hot alternating working condition are solved, and collaborative optimization of electromagnetic load stable transmission and structural service life is achieved.

The invention belongs to the technical field of power system faults, and discloses a turn-to-turn short circuit fault deduction method, system, equipment and medium, and the turn-to-turn short circuit fault deduction method comprises the steps: determining the critical strain value of the fracture of an insulating material based on the axial and radial tensile test data of a winding, and building a mechanical characteristic database of the dependent variable and the insulation fracture; establishing a Poisson boundary value equation set according to the magnetic vector potential and the current density, solving to obtain the magnetic induction intensity, establishing a circuit equation in a short circuit state based on the primary side voltage of the winding, and analyzing the linear relation between the deformation state of the winding and the electromagnetic load to obtain the maximum axial and radial deformation quantity of the winding; and based on the mechanical characteristic database, the turn-to-turn insulation state and the turn-to-turn short circuit condition are judged by combining the axial and radial maximum deformation quantity of the winding. According to the method, when the winding deformation is small, the occurrence condition of the turn-to-turn short circuit fault can be accurately deduced.

The application discloses a claw pole stepping motor with an integrated stator core, and belongs to the field of permanent magnet stepping motor design. The application is used for solving the problem that the equivalent air gap of the main magnetic circuit is increased and the torque density is decreased due to the split stator structure of the micro claw pole stepping motor. The application comprises a stator and a rotor. The stator adopts an integrated stator core which is integrally bent and formed from a single plate material, and sequentially forms an inner claw pole, a stator tooth bottom, a stator wall, a stator tooth top and an outer claw pole from inside to outside along the radial direction. The stator tooth bottom is provided with a positioning hole for inserting and fixing a coil framework. The coil framework is provided with a wire outlet structure, so that the coil can be led out from the gap of the core. The rotor comprises a rotating shaft and a permanent magnet. The integrated stator core design eliminates the assembly joint of the split structure, effectively reduces the equivalent air gap, reduces the magnetic flux leakage, and thus significantly improves the torque density and electromagnetic load of the motor.

This invention relates to the field of permanent magnet synchronous motor (PMSM) design technology, and discloses a method and device for integrated collaborative optimization design of the rotor magnetic circuit of a PMSM. The method includes: collecting time-series data of multi-source vibration and electromagnetic load under heavy-load conditions of forklift operation, and constructing a dynamic excitation phase space mesh for the rotor interface; performing multi-field coupled response simulation based on the mesh to drive a parameterized rotor model, generating a structural eddy current coupled simplex complex; constructing a combined constraint and sub-mode gain model for robust magnetic circuit optimization based on the complex, generating a geometrically reinforced candidate solution set; performing multi-objective collaborative convergence and three-dimensional model generation under the constraints of the candidate solution set, and outputting an anti-disturbance optimized rotor structure. This invention solves the problem that existing technologies cannot cope with dynamic multi-field positive feedback under complex forklift operating conditions, leading to decreased efficiency and low reliability of the motor during continuous operation, thus enabling the motor to adapt to forklift operation requirements.

The present application relates to the technical field of material and engine structure strength test, and specifically relates to an electromagnetic loading test method and system for simulating stress and strain under rotating state of a wheel disc, comprising the following steps: S1, magnetic field design for simulating stress and strain distribution of the wheel disc under rotating state; S2, electromagnetic loading device design; S3, electromagnetic load feedback and control; S4, real-time monitoring of full-field strain, the electromagnetic loading test method and system for simulating stress and strain under rotating state of the wheel disc can realize static loading of the test disc piece, the full-field stress and strain distribution of the wheel disc is consistent with that in the rotating state, the real-time monitoring of crack propagation behavior and full-field strain of the wheel disc under the load can be realized, and the method has the characteristics of simple operation, strong controllability, high energy conversion efficiency, low cost, short cycle, good compatibility and the like.

This invention discloses a soil-rock drying-wet cycle test system and method under continuous loading. The soil-rock drying-wet cycle test system under continuous loading includes a rock sample test chamber, in which rock samples are placed; a simulated precipitation system is located on the inner top of the rock sample test chamber; an electromagnetic load loading system is located inside the rock sample test chamber and on top of the rock sample to apply a moving load to the rock sample; and a ventilation and drying system is located on the side of the rock sample test chamber to ventilate and dry the rock sample. The electromagnetic load loading system includes a motion track located on top of the rock sample test chamber; an electromagnetic loading cylinder located on top of the rock sample; a lower pressure pad laid on the bottom of the rock sample; and an electromagnet located above the electromagnetic loading cylinder and within the motion track, which can reciprocate along the motion track under the drive of a magnet driving device; the end of the electromagnet near the electromagnetic loading cylinder has the same polarity as the electromagnetic loading cylinder. The system can automatically realize the drying-wet cycle, crushing, and screening of the rock sample.

The utility model discloses a lightweight permanent magnet synchronous motor for an electric aircraft. An electromagnetic structure in the motor comprises a stator iron core, an armature winding, a permanent magnet, a rotor magnet yoke and a rotor bracket, the stator iron core is of an annular columnar structure, stator grooves penetrating through the axial direction are evenly formed in the end face of the stator iron core in the circumferential direction, and armature windings are arranged in the stator grooves. A rotor magnet yoke is arranged to be of an annular thin-wall structure, a plurality of pole permanent magnets which are sequentially connected are evenly pasted to the outer ring wall face of the rotor magnet yoke in the circumferential direction, and an excitation assembly of an annular columnar structure is formed by the pole permanent magnets. The rotor magnet yoke and the permanent magnets of each pole adhered to the outer side wall of the rotor magnet yoke are mounted on the inner side of the stator iron core through the rotor bracket, and the permanent magnets of each pole and the inner side wall of the stator iron core form an annular thin-wall gap, so that the rotor magnet yoke, the permanent magnets of each pole and the rotor bracket rotate relative to the stator iron core; the permanent magnet of each pole is of a segmented structure and is divided into four segments which are arranged in a central symmetry mode, and the four segments comprise the two samarium cobalt permanent magnets located in the middle and the two neodymium iron boron permanent magnets located on the two sides. According to the technical scheme of the utility model, the problem that as most of the existing aviation permanent magnet synchronous motors adopt high-speed and high-electromagnetic-load design, the temperature rise of the motors is too high, and the stable operation of the motors is greatly threatened is solved.

The invention relates to a stress assessment method for a fusion reactor cladding non-cyclic load in a complex electromagnetic environment, and belongs to the technical field of magnetic confinement nuclear fusion. Comprising the following steps: establishing and simplifying a fusion reactor cladding three-dimensional geometric model, and dividing grids; electromagnetic field distribution is calculated through ANSYS Maxwell to obtain an electromagnetic load, temperature field distribution is calculated through ANSYS CFX to obtain a thermal load, the electromagnetic load and the thermal load are imported into ANSYS Mechical for coupling analysis, and mechanical loads are superposed to obtain a comprehensive stress field; selecting a stress evaluation line of the maximum equivalent stress area along the thickness direction of the structural material, and linearizing the stress tensor; and comparing the total stress value with the allowable stress value based on a non-cyclic load failure mode evaluation criterion. According to the method, the electromagnetic load influence is fully considered, the non-cyclic load performance of the cladding in a complex electromagnetic environment can be accurately evaluated, a reliable basis is provided for safety evaluation and design optimization of the fusion reactor cladding, and the development of a magnetic confinement fusion reactor technology is powerfully promoted.

The invention discloses a load rejection device for an unmanned underwater vehicle, and relates to the technical field of underwater load rejection. The invention aims to solve the problems that an electromagnet of an electromagnetic load rejection device of an underwater vehicle in the prior art does not have a stable waterproof measure, water is easy to leak after working for a long time in an ocean deepwater underwater environment, and the electromagnet has a failure risk, so that the safety performance of the electromagnetic load rejection device of the underwater vehicle is unstable. The system comprises an upper computer, an emergency load rejection cabin, an electromagnet and a load rejection object. The upper computer is electrically connected with the emergency load rejection cabin, the electromagnet is electrically connected with the load rejection cabin, a load rejection heavy object is arranged below the electromagnet, the electromagnet comprises a glue pouring mold, a fixing screw rod and an electromagnet assembly, and the electromagnet assembly is arranged in the glue pouring mold and fixedly connected with the glue pouring mold through the fixing screw rod. The underwater emergency load rejection device is used for underwater emergency load rejection of the aircraft.

The invention discloses an electromagnetic heating equipment control method based on load sensing, and particularly relates to the technical field of electromagnetic heating equipment control, which comprises the following steps: acquiring current and voltage when a special deck thick coating reaches a preset stripping temperature, and dividing point by point in a sliding time window to obtain an impedance sequence; identifying abnormal energy fluctuation of frequency points in the impedance sequence based on a fast Fourier transform tool to form a frequency fluctuation curve; by fusing coating thickness change, electromagnetic load response characteristics and temperature rise rate indexes, a dynamic regulation and control and multi-parameter analysis mechanism is constructed, continuous tracking of the degeneration process of the interface layer and judgment of the stripping completion state are achieved, and therefore it is ensured that the stripping conclusion is consistent with the real state of the interface; the problem that an existing judgment link depends on a macroscopic form and lacks an interface verification mechanism is solved.

This invention belongs to the technical field of high-field magnet structure design, specifically involving an adaptive selection method for simulation type in pulse magnet structure design. The method includes: establishing a model of the pulse magnet; using a circuit model to calculate the actual current waveform of the magnet at the required power supply voltage; importing this waveform into an electromagnetic finite element model to calculate the peak electromagnetic load of the magnet; applying this load as a single step load to the structural finite element model; extracting the stress-time curve of each target component; and extracting the fundamental component of this curve using Fourier transform to determine the natural vibration frequency of the component. ω m Perform a Fourier transform on the actual current waveform to determine its fundamental component. ω i If all target components ω m All are greater than N × ω i If a steady-state simulation evaluation is selected, then this invention can solve the problem of the lack of a standardized operating system in the existing pulse magnet structure design that can reasonably use static analysis results to approximate transient analysis results.

There is described an electric power generating apparatus having: a free-piston linear expander having a moving shaft creating mechanical power; an electrical generator converting the mechanical power into electrical power; a variable frequency drive configured for applying an electromagnetic load force modifying the shaft's movement; and a controller communicatively coupled to the variable frequency drive, the controller configured to perform the steps of: receiving sensor data including a first shaft position value, a first shaft velocity value, and a first electromagnetic load force value; using a drive control module, determining, based on the sensor, a second electromagnetic load force value which when applied would cause a shaft velocity to gradually change to a second shaft velocity value, the second electromagnetic load force value and the second shaft velocity value causing an output power value to correspond to a desired output power value; and applying the second electromagnetic load force value.

The hydraulic and electromagnetic dual-drive multi-working-condition rapid load rejection device comprises a mounting frame, a lever base is connected to the middle of the mounting frame, an electromagnetic drive load rejection lever and a hydraulic drive load rejection lever which are arranged in a crossed mode are connected to the middle of the lever base through pin shafts, and a ballast is hung between the two crossed levers. The other ends of the two levers are respectively supported by parts in the electromagnetic load rejection unit and the hydraulic load rejection unit, and no matter which one of the electromagnetic load rejection unit and the hydraulic load rejection unit releases the supported lever, the crossed structure of the suspended ballast on the base is damaged, so that the ballast is released; and the hydraulic load rejection unit is connected with the pilot valve, so that the hydraulic valve can be quickly opened, and the rapidity of hydraulic drive load rejection is improved. According to the invention, the ballast can be rapidly discarded under various working conditions, the load rejection under the conditions of normal working conditions, active emergency working conditions, passive emergency working conditions and the like is realized, and the safety of devices such as manned submersible and underwater robot is greatly ensured.

The invention discloses an intelligent bicycle two-way real-time interaction method and system for synchronizing virtuality and reality. The method comprises the steps that S1, a data acquisition module acquires rotation data of a motor in real time; s2, the microcontroller uploads rotation data of the motor to a cloud server in real time; s3, the cloud server calculates the motion data of the bicycle according to the rotation data of the motor, and synchronously renders the motion state of the user or the carrier in the virtual world; step T1, the cloud server generates a resistance control instruction in real time, and issues the resistance control instruction to the microcontroller in real time through the communication module; and T2, the microcontroller switches the motor to a generator mode, adjusts the electromagnetic load of the motor to simulate the environmental resistance in the virtual world, and stores the electric energy generated by the motor in the battery unit. According to the method, data of the real world can be uploaded, roles in the virtual world can be rendered, and environment parameters in the virtual world are fed back to the real world in real time, so that bidirectional real-time interaction between the real world and the virtual world is realized.

The invention discloses a method for testing the radial stress of an uninsulated high-temperature superconducting coil, and belongs to the field of superconducting electricians, and the radial stress is an important parameter of the high-temperature superconducting coil and is mainly the superposition of winding tension, electromagnetic load and cold shrinkage force. The radial stress is related to the self-protection characteristic of the high-temperature superconducting coil. The larger the radial stress is, the smaller the turn-to-turn contact resistance is, and the current at the hot spot is easier to shunt in the radial direction to avoid quenching. The invention relates to the technical field of high-temperature superconducting coils, potential points are arranged in the coil, turn-to-turn contact resistance is inverted according to a turn-to-turn mutual inductance matrix and test voltage and current signals, and radial stress is inverted by referring to the mapping relation between pressure and the turn-to-turn contact resistance.

The invention discloses a method for evaluating the impedance performance of a three-way electromagnetic load of a vehicle generator assembly, and the method comprises the steps: splitting a vehicle generator assembly housing into a plurality of plates, carrying out the triangular grid discretization of the surface of each plate, and calculating the total area of each discretized plate; establishing a cylindrical coordinate system of the vehicle engine assembly; under the condition that only radial electromagnetic load, only tangential electromagnetic load and only axial electromagnetic load are applied, excitation is applied to the vertexes of the triangular discrete units on the plates, the three-direction vibration acceleration of the vertexes is obtained, the radiation noise value of each plate is calculated, and a sound radiation noise curve of the vehicle engine assembly within a preset frequency range is obtained; aiming at the sound radiation noise curve in each direction, calculating to obtain radial, tangential and axial impedance coefficients under the electromagnetic load in the direction; and performing weighted fusion on the radial, tangential and axial impedance coefficients through a weighted combination strategy to obtain a comprehensive impedance coefficient, and performing evaluation according to a preset rating standard.

The invention relates to the field of relays, in particular to a large-current-impact-resistant relay which comprises a relay body, an electromagnetic assembly arranged in the relay body, a rotary armature driven by the electromagnetic assembly and an elastic piece, the elastic piece is provided with a fixed end and a movable end, and a movable contact is arranged at the movable end or at the position close to the movable end. The movable contact is arranged corresponding to a static contact arranged in the relay body, and the rotatable execution piece is provided with an execution piece main body which is rotatably arranged on the rotary shaft; the rotary armature is provided with a first transmission part, and the first transmission part is in transmission fit with the first acting part of the rotatable execution part. Through the design of the acute angle pressure direction, the closed state can be maintained, and the rotating torque for separating the contacts is greatly reduced, so that the capacity of the relay for resisting the impact of large-current electric repulsive force is remarkably improved on the premise that the electromagnetic load is not increased.

The present invention discloses a method for testing the radial stress of a non-insulated high-temperature superconducting coil, belonging to the field of superconducting electrical engineering. The radial stress is an important parameter of the high-temperature superconducting coil, which is mainly the superposition of winding tension, electromagnetic load and cold shrinkage force. The radial stress is related to the self-protection characteristics of the high-temperature superconducting coil. The greater the radial stress, the smaller the inter-turn contact resistance, and the current at the hot spot is more likely to be radially shunted to avoid quench. The present invention relates to the technical field of high-temperature superconducting coils. Potential points are arranged inside the coil, and the inter-turn contact resistance is inversely calculated according to the mutual inductance matrix of each turn and the measured voltage and current signals. Referring to the mapping relationship between pressure and inter-turn contact resistance, the radial stress is inversely calculated.

A method may include selecting, based on a condition of an electromagnetic load, a selected measurement technique from a plurality of impedance measurement techniques for measuring an impedance of the electromagnetic load and performing the selected measurement technique to generate an estimate of the impedance of the electromagnetic load.

The invention provides a commercial all-in-one motor controller performance test system. The system comprises a measurement and control subsystem, a simulation load and a main drive motor, an industrial personal computer in the measurement and control subsystem communicates with the simulation load, and the simulation load is used for simulating a mechanical load and an electromagnetic load of the main drive motor under a real working condition according to a first control instruction sent by the industrial personal computer and providing a required load environment for the main drive motor; a programmable bidirectional analog electronic load in the analog load is connected with a DCDC converter of the tested all-in-one motor controller, and a power conversion circuit in the programmable bidirectional analog electronic load is used for converting electric energy output by the DCDC converter into different forms of energy for consumption in the test process. And when the electric energy in the energy storage unit reaches a preset threshold value, the electric energy is fed back to the commercial all-in-one motor controller performance test system. According to the scheme, the problem that an existing commercial all-in-one motor controller test system is low in energy utilization efficiency is solved.

This invention discloses an electromagnetically loaded four-point bending stress device and a method for measuring the acoustoelastic coefficient of multilayer structures. The device is an electromagnetically loaded four-point bending stress loading device. Based on the magnitude of the electromagnetic force and four-point bending theory, the internal stress magnitude and distribution of the multilayer structure are calculated. The method achieves the propagation of ultrasonic critically refracted longitudinal waves along the interface of the multilayer structure by adjusting the incident angle of the emitted sound wave. The change in sound velocity under stress is calculated by analyzing the propagation path and sound time. Finally, the acoustoelastic coefficient of the multilayer composite structure is calculated based on acoustoelastic theory. The stress loading device of this invention can reduce internal damage to the specimen and can measure the acoustoelastic coefficient of the internal materials of multilayer structures.

This application discloses an electromagnetic load switch simulation test device, including an electric closing module, a fault current holding module, a mechanical closing module, a switch position acquisition module, and an I / O control module for sending closing position remote signaling to the closing device. The input terminal of the electric closing module is connected to the AC power supply, and the output terminal is connected to the input terminal of the switch position acquisition module. The input terminal of the fault current holding module is connected to the three-phase current, and the output terminal is connected to the input terminal of the switch position acquisition module. The mechanical closing module, the electric closing module, and the fault current holding module enable the switch position acquisition module with an OR logic relationship. The output terminal of the switch position acquisition module is connected to the I / O control module. This application has functions such as "closing upon power restoration and opening upon power failure," "maintaining the closed position during a fault," and "mechanical forced closing," and simulates different closing position remote signaling situations that occur during the operation of an electromagnetic load switch.

The invention discloses a motor design method based on a normalized cross coupling magnetic circuit. The method comprises the following steps: constructing a permanent magnet characteristic position magnetic circuit model containing symmetrical magnetic circuit nodes according to uniform division of a permanent magnet pole space; equivalently mapping the d-axis asymmetrically distributed magnetomotive force into the permanent magnet characteristic position magnetic circuit model to realize normalization processing of the d-axis magnetomotive force and the permanent magnet magnetomotive force; superposing magnetomotive force of each tooth of a d axis to symmetrical magnetic circuit nodes of the permanent magnet characteristic magnetic circuit model based on weight distribution to generate equivalent d-axis magnetomotive force; jointly embedding the equivalent d-axis magnetomotive force and the permanent magnet magnetomotive force into the permanent magnet characteristic magnetic circuit model to form a cross coupling magnetic circuit model; and performing iterative calculation on the cross coupling magnetic circuit model, and solving a magnetic circuit equation until convergence to obtain motor design parameters. The method can adapt to the multi-harmonic and high-electromagnetic load characteristics of a high-capacity low-speed motor, and the magnetic field calculation accuracy is improved.

The invention discloses a claw-pole stepping motor with an integrated stator core, belongs to the field of permanent magnet stepping motor design, and aims to solve the problems that the equivalent air gap of a main magnetic circuit is increased and the torque density is reduced due to the fact that a miniature claw-pole stepping motor adopts a split-type stator structure. The motor comprises a stator and a rotor, the stator adopts an integrated stator iron core formed by integrally bending a single plate, and an inner claw pole, a stator tooth bottom, a stator wall, a stator tooth top and an outer claw pole are sequentially formed in the radial direction from inside to outside. Positioning holes are formed in the bottoms of the stator teeth and are used for inserting and fixing a coil framework; the coil framework is provided with a wire outlet structure, so that the coil can be conveniently led out from the iron core notch. The rotor comprises a rotating shaft and permanent magnets. According to the invention, through the design of the integrated stator core, the assembly seam of a split type structure is eliminated, the equivalent air gap is effectively reduced, and the magnetic leakage is reduced, so that the torque density and the electromagnetic load of the motor are remarkably improved.

The invention discloses a method and circuit structure for reducing electromagnetic emission of a power line of an automobile electric control system, and relates to the technical field of electromagnetic compatibility, and the method comprises the steps: finding out a plurality of actuators causing voltage fluctuation on the power line from the automobile electric control system, and taking the actuators as electromagnetic loads of the system; the selected electromagnetic loads are divided into two groups which are respectively controlled by a high-side driving circuit and a low-side driving circuit; and a power line voltage acquisition and control compensation circuit is designed and is used for acquiring a power line voltage signal in real time and outputting a corresponding driving control signal according to the change condition of the signal so as to control the on-off of the high-side driving circuit and the low-side driving circuit. The circuit can realize closed-loop control of a high-side driving circuit and a low-side driving circuit under the condition that the load function is not influenced, two groups of electromagnetic loads are switched to work, the influence of the two groups of electromagnetic loads on the voltage of a power line is neutralized, the voltage fluctuation of the power line can be reduced, and the electromagnetic emission interference of the power line is reduced by maintaining the stable voltage.

The application discloses a motor design method based on normalized cross-coupling magnetic circuit, comprising: constructing a permanent magnet characteristic position magnetic circuit model containing symmetric magnetic circuit nodes according to the uniform division of permanent magnet magnetic pole space; equivalent mapping of magnetic motive force asymmetrically distributed on the d-axis to the permanent magnet characteristic position magnetic circuit model to realize the normalization processing of the magnetic motive force on the d-axis and the permanent magnet magnetic motive force; based on weight distribution, superimposing the magnetic motive force of each tooth on the d-axis to the symmetric magnetic circuit nodes of the permanent magnet characteristic magnetic circuit model to generate equivalent d-axis magnetic motive force; embedding the equivalent d-axis magnetic motive force and the permanent magnet magnetic motive force into the permanent magnet characteristic magnetic circuit model to form a cross-coupling magnetic circuit model; iteratively calculating the cross-coupling magnetic circuit model to solve the magnetic circuit equation until convergence is obtained to obtain motor design parameters. It can adapt to the multi-harmonic and high electromagnetic load characteristics of large-capacity low-speed motors and improve the accuracy of magnetic field calculation.

A kind of simulation retaining wall active soil pressure test device, including main frame structure, loading device and precipitation device, main frame structure includes upper side main beam, lower base, immovable partition plate-and movable partition plate, water sprinkling device is arranged in upper side main beam, water sprinkling device is connected water sprinkling nozzle, drainage passage is arranged in immovable partition plate-and movable partition plate from top to bottom, for simulating soil extrusion drainage process, the upper side of drainage passage is provided with filter core, to prevent soil loss, the lower side is connected lower base drainage, resin glass is installed on lower base, loading device uses electromagnetic load, several loading device is evenly arranged on fixed partition plate and movable partition plate face to face, threaded steel pipe is arranged below movable partition plate, for restoring position after experiment, displacement measuring device is arranged below threaded steel pipe, the advancing distance of movable partition plate is measured.Using electromagnetic loading device load control is more accurate, and real-time adjustable, and through valve control drainage system can better simulate various situations in actual engineering.

A full-automatic stress path triaxial apparatus includes a main frame, a loading device and a confining pressure control device; the main frame includes an upper main beam, a surrounding rod and a lower base, the surrounding rod is connected to the upper main beam and is fixed on the lower base by screwing, a plurality of threaded holes are arranged on the lower base for fixing the surrounding rod into different shapes, a plurality of drainage channels are arranged on the lower base, a filter element is arranged on the upper side of the drainage channel to prevent soil loss, the lower side of the drainage channel is connected to the lower base for drainage, the loading device uses an electromagnetic load one and an electromagnetic load two, the electromagnetic load one is arranged below the upper main beam, a pad is arranged above the soil, the electromagnetic load two is arranged above the pad, and the electromagnetic load one and the electromagnetic load two are oppositely arranged; the confining pressure control device includes a rubber air bag and a fixing rod, the fixing mode of the fixing rod is consistent with the fixing mode of the surrounding rod, and the rubber air bag is placed inside the fixing rod, thereby improving the test precision, simulation capability and operation convenience.

The invention discloses a load rejection system of underwater equipment. The load rejection system comprises an acoustic releaser, an electrochemical load rejection device, a load rejection executing mechanism and a tensioner. The acoustic releaser receives an acoustic instruction to execute load rejection, and the electrochemical load rejection device executes load rejection through electrochemical corrosion fusing in seawater; the load rejection device and the load rejection device are connected in series through a load rejection rope and are connected with a load rejection block; in the system, an acoustic releaser and an electrochemical load rejection device form a parallel redundant structure, and a rope can be loosened to release a load rejection block when any device triggers load rejection. The device has the remarkable advantages that the uncertainty of a traditional acoustic releaser affected by the environment and the defects of an electromagnetic load rejection device are overcome, emergency load rejection can be achieved when the acoustic releaser fails, timely recovery can be achieved after work is completed, timing, event and emergency load rejection can be achieved through the electrochemical load rejection device, the safety, practicability and reliability of underwater equipment are improved, and the device is suitable for popularization and application. And the application range is wide.