21 results about "Large deflection" patented technology

The invention discloses a large-deflection deformation flexible shaft hole assembly method and device based on tactile perception, storage equipment and a program product, and belongs to the technical field of robot assembly. The problem that an existing assembling method does not consider the influence of non-linear large-deflection deformation of the flexible shaft on the assembling precision of the shaft hole is solved. Based on pressure distribution data fed back by the tactile sensor, the deformation condition of the shaft can be estimated and adjusted, the flexible shaft workpiece makes effective contact with the rigid plane where the target hole is located, whether the shaft passes through the hole or not is monitored in real time in the blind hole searching process, and after the hole is searched, the mechanical arm is controlled to automatically align the shaft hole, so that the hole searching efficiency is improved. And the shaft insertion action is completed. The device is mainly used for shaft hole assembly of the large-deflection deformation flexible shaft workpiece.

The invention provides a post-buckling calculation method for cold-rolled strip steel internally provided with an initial strip shape defect, and relates to the technical field of buckling. The method comprises the following steps: firstly, acquiring geometric dimension parameters and attribute parameters of cold-rolled strip steel with initial plate shape defects in a production field, and then establishing a large deflection balance equation and a deformation coordination equation of the cold-rolled strip steel with initial defect items in the interior to form a post-buckling calculation model of the cold-rolled strip steel with the initial plate shape defect items in the interior; and finally, a perturbation method and a Hamiltonian method are used for solving a large-deflection balance equation and a deformation coordination equation of the cold-rolled strip steel internally provided with the initial plate type defect item, and a general analysis model formula for post-buckling of the cold-rolled strip steel internally provided with the initial plate type defect item is obtained. According to the post-buckling calculation method for solving the cold-rolled strip steel internally provided with the initial plate shape defect, the post-buckling mechanical mechanism of the cold-rolled strip steel internally provided with the initial plate shape defect can be better improved, the plate quality is improved, and the plate defect is eliminated.

The invention relates to the field of pressure (0-200 kPa) detection, in particular to an MEMS integrated pressure sensing device or a monolithic integrated multi-frequency capacitive micromachined ultrasonic transducer (CMUTs) for wide-range pressure measurement. According to the monolithic integrated multi-frequency CMUTs, a first CMUTs, a second CMUTs and a third CMUTs are integrated on a chip; by adjusting the diaphragm thickness, cavity height and diaphragm radius of the first, second and third CMUT units and the pressure value in the cavity of the second CMUT unit, the first and second CMUT units work in a linear range of small deflection deformation, and the third CMUT unit works in a linear range of large deflection deformation. And the working ranges of the first CMUT unit, the second CMUT unit and the third CMUT unit form a continuous and complete measurement interval, and the resonant frequencies are not overlapped, so that the integrated pressure sensing device which can be used for 0-200 kPa full-pressure range measurement is realized.

The present application relates to a kind of pre-tensioned steel wire rope lateral impact response calculation method considering geometric and friction nonlinear coupling.First, the linear tensile constitutive model of pre-tensioned steel wire rope is constructed, Von Kármán large deflection theory is introduced, and the geometric hardening relationship of the nonlinear growth of axial tension with lateral deflection is established;Subsequently, a bilinear bending stiffness model is constructed to calculate the critical anti-sliding torque that evolves dynamically with tension;Based on the principle of energy conservation and Rayleigh-Ritz method, the system total potential energy functional of axial tensile potential energy and nonlinear bending potential energy is constructed, and the maximum impact deflection and tension response of the steel wire rope are obtained by solving the energy residual equation, the maximum response is substituted back into the constitutive equation, and the maximum nominal stress of the midspan cross section, the maximum axial tension and the extension length of the internal slip zone are calculated.The present application has very high calculation efficiency compared with full-size finite element simulation, and is suitable for the rapid design and safety evaluation of steel wire rope protection system.

The invention discloses an auxiliary guide vane design method and system for a variable air inlet guide vane of a gas compressor, and is applied to the technical field of fluid machinery. The method comprises the steps of performing CFD numerical simulation on a main guide blade under an existing large-deflection-angle working condition to obtain a separation point position of the main guide blade; determining an initial design parameter combination of the auxiliary guide vane; cFD numerical simulation is carried out on the main guide vane and the auxiliary guide vane, and the minimization of the separation area and the total pressure loss coefficient are taken as optimization targets; solving the optimization target to obtain an optimal auxiliary guide vane design parameter combination; the optimization effect of the optimal auxiliary guide vane design parameter combination is verified through experiments, and the auxiliary guide vane design parameter combination is corrected. According to the invention, one auxiliary guide vane is specifically designed on the basis of the existing main guide vane, so that the loss caused by vane back separation flow under a large deflection angle is reduced, and the main guide vane does not need to be redesigned.

This invention relates to the field of pressure (0~200 kPa) detection, and more particularly to MEMS integrated pressure sensor devices or monolithically integrated multi-frequency capacitive micromechanical ultrasonic transducers (CMUTs) for wide-range pressure measurement. The monolithically integrated multi-frequency CMUTs integrate a first CMUT, a second CMUT, and a third CMUT on a single chip. By adjusting the diaphragm thickness, cavity height, diaphragm radius of the first, second, and third CMUT units, as well as the pressure value within the cavity of the second CMUT unit, the first and second CMUT units operate within a linear range of small deflection deformation, and the third CMUT unit operates within a linear range of large deflection deformation. Furthermore, the operating ranges of the first, second, and third CMUT units constitute a continuous and complete measurement interval, with resonant frequencies that do not overlap, thus realizing an integrated pressure sensor device usable for measuring the entire pressure range of 0~200 kPa.

The invention discloses a large-deflection test device and method for measuring the anti-galloping effect of phase-to-phase spacers. The device comprises a frame, and movable cross beams used for connecting the two ends of the phase-to-phase spacers are installed at the upper end and the lower end of the frame; the movable cross beams have translational freedom degrees in the vertical direction and can move up and down in a test, the movable cross beams at the upper end and the lower end are connected through steel wire ropes, the distance between the movable cross beams at the upper end and the lower end is adjusted by adjusting tension in the steel wire ropes, and different bending deflections of spacing rods are measured. According to the invention, a multi-stage dynamic load loading technology is adopted, nonlinear large-deflection deformation characteristics of the wire under complex conditions of strong wind, icing and the like can be simulated, the maximum deflection range of the test covers 60%-80% of an actual galloping amplitude, and compared with a traditional small-deflection test, the simulation authenticity is remarkably improved, and a more reliable basis is provided for anti-galloping performance evaluation.

The invention discloses a strain sensor calibration device with a limiting structure and a calibration method, and belongs to the technical field of measuring instruments. The calibration device comprises a vibration isolation platform, a clamping support beam fixed on the vibration isolation platform, an upper limiter and a lower limiter which are symmetrically arranged above and below a cantilever beam, and the cantilever beam of which one end is connected with the piezoelectric ceramic exciter through threads and the middle part is clamped by the limiters. And the piezoelectric ceramic exciter penetrates through the clamping support beam and applies displacement excitation with preset amplitude and frequency to excite the cantilever beam to vibrate. When the deflection of the short beam section of the cantilever beam exceeds a set gap, the limiting stopper makes contact with the short beam section, subharmonic vibration and chaotic motion of the short beam section are restrained through the nonlinear modulation effect, and therefore the main beam section outputs stable periodic deflection response. According to the invention, the problems of unstable signals and insufficient precision in dynamic calibration are solved, and high-precision dynamic calibration of the strain sensor under the conditions of low frequency and large deflection is realized.

The application discloses a strain sensor calibration device with a limiting structure and a calibration method, and belongs to the technical field of measuring instruments. The calibration device comprises a vibration isolation platform, a clamping support beam fixed on the vibration isolation platform, upper and lower limiters symmetrically arranged above and below a cantilever beam, and the cantilever beam with one end connected with a piezoelectric ceramic exciter through a thread and the middle part clamped by the limiter. The piezoelectric ceramic exciter penetrates through the clamping support beam and applies displacement excitation with a preset amplitude and frequency to excite the cantilever beam to vibrate. When the deflection of the short beam section of the cantilever beam exceeds the set gap, the limiter is in contact with the short beam section, the nonlinear modulation effect is used to suppress the subharmonic vibration and chaotic motion of the short beam section, so that the main beam section outputs stable periodic deflection response. The application solves the problems of unstable signal and insufficient precision in dynamic calibration, and realizes high-precision dynamic calibration of the strain sensor under the condition of low frequency and large deflection.

This invention relates to the field of motor control, and more particularly to a positioning and calibration method for a gantry mechanism of a bonding machine based on solder joint alignment. The method includes: monitoring the speed difference and real-time displacement deviation of two independently controlled servo motors on both sides of the gantry mechanism; calculating the predicted displacement deviation on both sides of the gantry mechanism based on the speed difference and real-time displacement deviation; calculating the deflection angle of the gantry mechanism's crossbeam relative to the guide rail length direction based on the predicted displacement deviation; determining the target speed of the two servo motors based on the deflection angle; and determining the change process of the current speed towards the target speed. This invention utilizes the length of the crossbeam to ensure that the generated corrective torque is physically matched with the required angular deviation; it can automatically plan a smoother speed change rate under high-risk conditions with relatively large deflection angles; and it employs a relatively fast speed change process under normal fine-tuning conditions with relatively small deflection angles, thereby ensuring the system's rapid response capability to minor disturbances.

The application provides a kind of light beam synthesis scanning system based on optical fiber laser phased array, utilize the wide-angle high-precision light beam scanning array of adaptive optical fiber collimator (1-2) and micro-lens array scanner (1-1) cascade, under the action of confocal scanning control platform (1-3), realize fast and efficient, large deflection angle confocal scanning pointing control, utilize phase modulator array (2-1), under the action of common phase synthesis control platform (2-2), realize array light beam stable and efficient common phase synthesis, finally realize the large-angle high-precision electric scanning of synthesis light beam.The application has the advantages of simple structure, compact, modular, scalable;Equivalent large aperture can be constructed by increasing the number of arrays, reduce manufacturing difficulty and cost;It has the functions of large dynamic range, high precision and fast deflection, and can compensate atmospheric turbulence effect in transmitting or receiving system.

The invention discloses a recombinant bamboo beam bearing capacity calculation method and system considering horizontal shear failure, and the method comprises the steps: determining typical failure modes, namely bending failure and shear failure, of a flexural member of a recombinant bamboo beam based on a standard small test piece material property test and a full-size beam member four-point bending test; deducing a deflection and rotation angle calculation model of the beam based on an initial parameter equation suitable for a complex load condition; based on the four-fold-line constitutive relation and the section rotation angle of the material, a bearing capacity calculation model considering large deflection of the recombined bamboo beam under the action of the external load and large rotation of the beam body is constructed; through comparison between the bearing capacity obtained through a four-point bending test of the full-scale beam component and the bending bearing capacity of the recombined bamboo beam component estimated based on the material mechanical property obtained through a material property test of the standard small test piece, it is verified that mechanical parameters obtained through the standard small test piece can be applied to calculation of the bending bearing capacity of the beam component. The method can provide a theoretical basis for design and application of the recombined bamboo beam in structural engineering.

The present invention proposes a method for calculating the external pull-out force of instability after the steel shell in a combined cable tower yields, which belongs to the field of bridge engineering. The method solves the problem in the prior art that in a steel shell-concrete combined cable tower, the buckling of the steel shell in a ductile state may cause the shear connector to be pulled out, and the structure cannot reach the ideal strength index and is destroyed in advance. The present invention first obtains the thin plate large deflection theory to obtain the thin plate large deflection equation of the steel shell, and then obtains the basic expression of the deformation function and the expression of the stress function; and establishes a specific expression of the deflection at the solution of the Galerkin equation; then obtains the expression of the final deformation function based on the specific expression of the deflection; finally, the expression of the final deformation function is substituted into the surface external force equilibrium equation of the thin plate large deflection equation to obtain the distribution function of the pull-out force; in the present invention, the pull-out force that can be generated when the plate shell is buckled can be obtained according to different shear connectors and different plate thicknesses, and then the arrangement requirements of the shear connectors are clarified.

The present application relates to the technical field of buckling and post-buckling analysis, and particularly relates to a method for explicit fast analysis of buckling and post-buckling under mechanical load, which simultaneously considers the influences of pre-buckling nonlinear deformation, post-buckling large deflection, initial geometric defects and the influences of the positions of the stiffeners in space. Based on high-order shear deformation theory, the influences of precise curvature relationship are considered, and control equations for buckling problems of a stiffened composite cylindrical shell structure are established, wherein the control equations contain tensile-bending coupling effect, tensile-twist coupling effect, bending-twist coupling effect and thermal effect. The method introduces precise curvature expression, geometric nonlinear relationship and the relationship between the stiffened structure and the coordinate position of the shell into the buckling and post-buckling analysis of the fiber-reinforced anisotropic stiffened laminated cylindrical shell under axial compression, external pressure and torsion working conditions, and can consider different combinations and distribution forms of the stiffeners.

The invention relates to the technical field of cold rolling continuous annealing, in particular to a method for judging deflection of a thin roller in a continuous annealing furnace based on Fourier transform, which comprises the following steps of: acquiring a torque signal of the thin roller in the production process, and performing fast Fourier transform (FFT) analysis on the torque signal of the thin roller within the acquisition time delta t; an original torque signal is converted into a frequency domain signal from a time domain signal, a frequency band closest to the rotation period of the thin roller is extracted from the torque signal by referring to the running linear speed of the thin roller, Fourier transform of a torque sequence or the frequency characteristic of a system is extracted to achieve frequency sampling, the signal amplitude of the extracted frequency band is analyzed, and the frequency of the thin roller is calculated. The unbalance loading degree is obtained, a deflection tendency chart and a scatter diagram are obtained according to Fourier transform and frequency sampling, the unbalance loading degree is compared with a dangerous threshold value, and an alarm is given if the unbalance loading degree exceeds the threshold value; according to the method, early warning is conducted on the roller with the too large deflection degree, rubbing between the roller and the strip steel is avoided, and production accidents are reduced.

The method, device, storage device and program product for assembling flexible shaft holes with large deflection deformation based on tactile perception belong to the field of robot assembly technology. The problem that the existing assembly method does not consider the influence of the nonlinear large deflection deformation of the flexible shaft on the shaft hole assembly accuracy is solved. Based on the pressure distribution data fed back by the tactile sensor, the present invention can estimate and adjust the deformation of the shaft, so that the flexible shaft workpiece and the rigid plane where the target hole is located are effectively contacted, and whether the shaft passes through the hole in real time during the blind hole search process, and after finding the hole, the robot arm is controlled to automatically align the shaft hole to complete the shaft insertion action. The present invention is mainly used for shaft hole assembly of flexible shaft workpieces with large deflection deformation.

The application belongs to the technical field of automatic control, and particularly discloses a robot force perception assembly method for a space electrical connector under an arbitrary posture, which comprises the following steps: after single-point contact of a plug and a socket, a reverse conical diffusion motion is adopted to identify a deflection angle range of the plug and the socket in combination with a contact torque mutation condition; if the deflection angle range is small deflection angle contact, then corresponding plug and socket posture information is recorded according to a contact torque mutation direction, that is, the corresponding plug and socket are in a double-point contact state; if the deflection angle range is large deflection angle contact, then single-point contact is judged to be bottom surface contact or side surface contact according to a spiral motion track tracking error; in the double-point contact state, expected contact force along the tail end is set to guide the plug to move along the surface of the socket, so as to realize Z-axis alignment of the plug and the socket; and expected contact torque along the Z-axis of the plug is set to drive protection grooves of the plug and the socket to be aligned. The application guarantees that the space assembly task can still be completed under extreme conditions, and improves assembly efficiency.

The invention relates to the field of cold rolling process control, in particular to a cold-rolled silicon steel working roll channeling roll insertion amount setting method which comprises the steps that a working roll edge roll shape curve is converted into a strip steel coordinate system from a working roll coordinate system; calculating the maximum deflection value of the working roll; constructing a hyperelliptic equation as a working roll deflection distribution function; calculating the deflection of the working roll at the position of the strip steel edge feature point by using a hyperelliptic equation, and calculating the corresponding channeling roll insertion amount in combination with an edge roll shape curve equation; correcting the maximum deflection value of the working roll, fitting a reduction rate distribution curve according to the strip steel thickness distribution measured values at the inlet and the outlet of the rolling mill, and calculating the maximum deflection correction value; and correcting the hyperelliptical index, and calculating the corrected deflection according to the reduction rate deflection of the edge feature point position. The method has the advantages that the edge roll shape curve of the working roll is mapped to the strip steel coordinate system through coordinate transformation, the deflection distribution of the working roll is accurately calculated in combination with the hyperelliptic equation, and the calculation precision of the channeling roll insertion amount is remarkably improved.

The invention provides a method for estimating the structural integrity state of a marine ceramic capacitive pressure sensor, and the method comprises the steps: building a mathematical model of a ceramic capacitor diaphragm, and enabling the mathematical model to be used for describing the deformation behavior of the diaphragm and the relation between the deformation behavior and the capacitance change under the action of external pressure; carrying out basic hypothesis analysis on the diaphragm; respectively calculating the deflection of the diaphragm in small deflection deformation and large deflection deformation, and calculating the maximum allowable strain of the diaphragm; the capacitance and capacitance sensitivity of the pressure sensor are calculated, and the relation between the capacitance variation and the pressure is obtained; and comprehensively evaluating the structural integrity of the pressure sensor by combining the deformation behavior of the diaphragm, the maximum allowable strain and the relationship between the capacitance and the pressure. According to the method, the ceramic capacitor technology is combined, numerical simulation and experimental verification are carried out by establishing a mathematical model based on finite element analysis software and a deflection deformation theory, and thus the reliability and accuracy of the sensor in practical application are ensured.

The invention discloses a piezoelectric MEMS micromirror based on arc-shaped driving and spiral spring construction, the micromirror is a composite system formed by a central mirror surface, an annular frame and four groups of symmetrically distributed thin plate type piezoelectric driving units, and each driving unit comprises an arc-shaped piezoelectric driver and a connecting beam with a gradually changed section, the starting end of the driver is fixed to the edge of the frame and elastically coupled to the center of the mirror surface through the connecting beam to form a closed mechanical loop. The structure has the beneficial effects that the gradual change type chaining beam and the arc-shaped driver form a spiral spring-like structure, so that the impact resistance of the structure is enhanced while the deflection angle and the driving resolution are improved. Experiments show that the design remarkably improves the mirror surface filling rate and the structural stability, the comprehensive performance index (FoM) of the two-dimensional piezoelectric micromirror is improved to 0.44 and is improved by 29.4% compared with the prior art, and a reliable execution structure with high-frequency response and a large deflection angle is provided for an optical system.

This invention discloses an aerodynamic vector nozzle capable of large vector angle deflection and rapid thrust reverser function, belonging to the field of aerospace vehicle engine exhaust systems. It can rapidly achieve large vector angle deflection of the main jet and thrust reverser control through the injection and cutoff of passive secondary flow, enabling multi-mode thrust switching in the aircraft propulsion system. The invention includes a main jet channel, a secondary flow channel, an expansion channel, a thrust reverser channel, and an exit channel. This nozzle controls the jet deflection solely through minor disturbances in the passive secondary flow within the secondary channel and the double-sided Coanda walls in the expansion channel, distributing the jet flow to the thrust reverser channel and the exit channel to achieve large vector angle deflection and thrust reverser function. Thrust reverser control can be completed rapidly within 0.2 seconds, with a thrust reverser coefficient reaching 0.215. This invention eliminates the need for complex mechanical moving parts and high-pressure gas source control devices, enabling rapid jet vector deflection, rapid thrust variation, and thrust reverser control. It boasts advantages such as a large deflection vector angle, fast control response, and rapid thrust reverser capability.