1325 results about "Relative displacement" patented technology

The invention relates to the technical field of sensors, and discloses an inductive displacement sensor, which comprises a substrate, two pairs of rectangular receiving coils fixedly arranged on the surface of the substrate and a vortex linear exciting coil, an initial plane coordinate system is created by taking the center of the substrate as an original point, and the two receiving coils in each pair are arranged in parallel; the excitation coil is located on the side, away from the substrate, of the receiving coil and is parallel to the surface of the substrate. In the initial state, when the projection of the center point of the exciting coil on the substrate coincides with the original point of the initial plane coordinate system and the receiving coil has displacement in the xy plane relative to the exciting coil, the two pairs of coils output relative displacement in the x direction and the y direction respectively, and decoupling of the relative displacement in the two directions is achieved at the same time. Displacement measurement in two directions can be carried out at the same time, high-precision and high-stability measurement of displacement signals is achieved, the good dynamic response characteristic is achieved, and errors caused by movement of mechanical parts are reduced.

The invention provides a damper capable of actively controlling damping force, a damping system and a damping system control method. The damper comprises an oil cylinder body, a cylinder cover, a piston, a piston rod, a first connecting lug plate, a connecting body and a second connecting lug plate. When two structural units of a civil structure generate relative displacement under the action of an earthquake or other external forces, the piston and the oil cylinder body generate relative movement, and the relative movement between the piston and the oil cylinder body enables viscous oil in the first damping cavity and the second damping cavity to flow mutually through the oil flow control mechanism. The oil flow between the first damping cavity and the second damping cavity can be controlled through the oil flow control mechanism to adjust the damping force, when the oil flow is increased, the damping force is reduced, and when the oil flow is reduced, the damping force is increased, so that the damping force can be adjusted and controlled according to the earthquake action or other external force; and the safety of the civil structure is effectively guaranteed while the requirement for buffering the two structural units of the civil structure is met.

The invention discloses a numerical simulation method, system and equipment for bond-based near-field dynamics and a medium. The method comprises the following steps: randomly assigning linear elastic ultimate elongation and tensile ultimate elongation of each substance point of a to-be-analyzed material subjected to quantitative discrete processing by adopting a Weibull function; based on a discrete processing result, calculating a relative position vector, a relative displacement vector, bonding stiffness and bond elongation of any two substance points in the ethnic group in sequence, and constructing a bilinear damage function and a bond-based near-field dynamic constitutive equation; based on a constitutive equation, circularly updating the coordinate information of each material point and the elongation of the key step by step; obtaining a bilinear damage function value according to the updated elongation of the key, and updating the ethnic group information; and calculating a local damage value of each substance point according to the updated group information so as to carry out fracture condition analysis and obtain a damage judgment result. According to the method provided by the invention, the fracture prediction accuracy of the cement stabilizing material is improved, and the strain softening characteristics of the material can be reflected.

The invention discloses a sensor clamping mechanism and a mutual inductor crimping fault detection device and method, and relates to the technical field of mutual inductor detection. In a project verification process of an existing voltage-withstanding table and an error table, abnormal conditions such as inclination of a mutual inductor body, inaccurate tray positioning, abnormity of a magnetic switch, air leakage of an air cylinder air pipe and the like occur, so that a terminal stud of a test table cannot be in contact with a secondary side terminal of a mutual inductor to be tested; and detection interruption or false detection of a corresponding mutual inductor exists, so that the verification efficiency is reduced. According to the frame body, the measuring rod, the elastic piece and the sensor, the sensor can detect the relative displacement between the measuring rod and the frame body, if the relative displacement is within a normal range, the terminal stud is in successful crimping contact, and if the relative displacement exceeds the normal displacement range, the terminal stud has a crimping fault. Therefore, the system judges that the wiring terminal of the to-be-detected mutual inductor is failed in crimping with the wiring end, automatically identifies the crimping fault of the wiring end, and improves the operation efficiency of an assembly line.

The invention provides a tarpaulin frame with an anti-deformation function and a truck tarpaulin system. The tarpaulin frame comprises cross bars, and the bottom ends of the cross bars are provided with first contact surfaces; the top end of the vertical pile is provided with a second contact surface; the guide assembly is respectively connected with the cross bar and the vertical pile, comprises a fixed frame, is formed on one of the first contact surface and the second contact surface, and is provided with a through buffer space; the mounting seat is matched with the fixed frame, is formed on the other one of the first contact surface and the second contact surface, and is provided with a mounting groove with an opening facing the fixed frame; and the two ends of the guide part can penetrate through the buffer space to be connected with the side walls of the mounting grooves correspondingly, the guide part responds to deformation of the tarpaulin frame, and the guide part can limit the relative displacement between the fixing frame and the mounting base in the buffer space. When the tarpaulin frame is impacted by external force, unfavorable deformation of the tarpaulin frame is avoided, and the stability of the overall structure of the tarpaulin frame is guaranteed.

The invention belongs to the technical field of soil pile testing, and particularly relates to a full-size static sounding soil squeezing pile penetration depth and ultimate bearing capacity synchronous testing device which comprises a supporting frame composed of two transverse rectangular plates and two longitudinal rectangular plates. A bearing supporting plate is fixedly installed on the upper surface of a longitudinal rectangular plate on one side of the supporting frame through bolts, a surrounding plate is arranged on the edge of one side of the upper surface of the bearing supporting plate, and a partition section is arranged between the bearing supporting plate and the surrounding plate. In the monitoring assembly, a photoelectric displacement sensor is installed between a sleeve and an anti-interference ring, the soil penetration depth of the concrete pile is accurately obtained by detecting the relative displacement of the sleeve and the anti-interference ring, external interference is effectively reduced through the arrangement of the anti-interference ring, the stability and accuracy of measured data are guaranteed, and a pressure sensor is matched with a stress sleeve to accurately transmit the stress of the pile body; the pressure change can be accurately sensed, the transmission structure of the worm gear and the worm is combined, the ultimate bearing capacity measurement precision is further improved, and reliable data support is provided for engineering design.

The invention relates to the field of electric vehicle design, in particular to an electric vehicle charging port area design method and system, which comprises the following steps: selecting a body-in-white structure unit corresponding to a charging port area, and arranging a rigid structure on the body-in-white structure unit corresponding to the charging port; loading force generated when the charging gun is inserted into and pulled out of the charging port is obtained and applied to the rigid structure, and stress deformation displacement between the rigid structure and the body-in-white structural unit and the residual deformation value of the body-in-white structural unit are recorded so that the structural design of the charging port area can be updated. The charging port is simulated by the rigid structure, the charging port area is simulated by the body-in-white structure unit, the loading force is applied to the rigid structure, the plugging of the charging gun on the charging port is simulated, and the stress deformation displacement and the residual deformation value between the rigid structure and the body-in-white structure unit are calculated. The relative displacement and plastic deformation of the charging port area are analyzed, whether the current structural design is reasonable or not is analyzed, and scientific basis and analysis are provided for the structural design of the charging port area.

The invention provides a ball bearing clearance measuring tool for a bulb tube, a ball bearing to be measured comprises a bearing body, a bearing outer ring and a rolling body, and the measuring tool comprises a support; the bearing support is provided with a bearing containing cavity used for containing the ball bearing, and the bearing outer ring is tightly pressed in the bearing containing cavity. The limiting mechanism is used for limiting the bearing outer ring to move relative to the bearing support in the axial direction of the ball bearing; the rotating mechanism is used for driving the support to rotate and further driving the bearing support to turn over by 180 degrees in the vertical direction, so that the ball bearing is switched between a first limit position and a second limit position, and the axial direction of the ball bearing is in the vertical direction at the first limit position and the second limit position; at the first limit position and the second limit position, the measuring mechanism respectively measures a first numerical value and a second numerical value representing the relative displacement of the bearing body and the bearing outer ring, and the first numerical value and the second numerical value are used for determining the axial clearance of the ball bearing. According to the scheme, the axial clearance measurement accuracy can be improved.

The utility model belongs to the technical field of bridge engineering, and particularly relates to a structure for widening a new bridge and an old bridge flexibly by adopting telescopic steel bars, which comprises a bridge web, a mounting groove, a fixing plate unit, the steel bars, pipe bodies and a tensile combination block unit, so that 1, a combined sleeving structure of a plurality of steel bars and a plurality of pipe bodies has enough flexible deformation capability, and the tensile combination block unit can be used for widening the new bridge and the old bridge; the new and old bridges are allowed to generate proper relative displacement in the vertical direction and the longitudinal direction; 2, the combined sleeving structure is still an integrated connecting structure, so that the vertical load can be fully transmitted, and the old bridge is further protected; 3, the new bridge and the old bridge are difficult to be far away from each other greatly in the transverse bridge direction, so that the basic function of widening connection is realized; and 4, when the fixing plate unit is installed, the new and old bridge structures do not need to be greatly changed, and the structural strength of the new and old bridges cannot be greatly damaged.

The invention discloses an inertial bridge transverse dynamic deflection measuring device and method. The inertial bridge transverse dynamic deflection measuring device comprises a shell, a spring, a mass block, a first limiting mechanism and a displacement meter. The mass block is located in the shell, one ends of the springs are symmetrically fixed to the two ends of the mass block, the other ends of the springs are fixed to the inner wall of the shell, a through hole is formed in an end plate, connected with the springs, of one side of the shell, and the testing end of the displacement meter measures the relative displacement of the mass block and the shell through the through hole. The first limiting mechanism is used for offsetting the total gravity of the mass block and the magnets arranged on the mass block. The device can be adaptive to direct testing of the transverse dynamic deflection of the main beam with different requirements of bridges with different spans on the transverse dynamic deflection precision, and has the remarkable advantages of high measurement precision, rapidness and high efficiency in installation and arrangement, simple structural form, better natural environment adaptability and economy and the like.

The invention belongs to the field of automobile brake testing, and relates to an opposed piston brake caliper assembly'return stroke and clearance 'performance testing method and device, and the method comprises the steps: S1, full-stroke lubrication: carrying out the pressurization under the condition of no brake block, and carrying out the pressure reduction so as to completely push a piston back to the bottom of a cylinder hole; s2, simulating the position of the piston in a new product gap; s3, zero setting of the displacement sensor: determining the initial hydraulic pressure and performing zero setting according to the initial hydraulic pressure; s4, testing the return stroke and the clearance: applying 1 MPa of gradually rising pressure to the brake caliper, releasing the pressure, keeping the pressure for 120 seconds, sequentially testing the pressure of 3 MPa, 5 MPa, 7 MPa, 9 MPa and 11 MPa until 15 MPa, and testing each pressure twice; s5, measuring and recording relative displacement between the piston and the shell under each pressure; and S6, analyzing the output data, and performing data processing. A test object of the method comprises a friction block mode and a steel block mode. The device is composed of a pressurization adjusting system, a clamping alignment unit and a test data analysis system. The testing of the return stroke and the gap of the fixed card has great significance in analyzing and reducing dragging, matching liquid demand and other key performances.

The invention relates to the technical field of physical acoustics, in particular to a saturated porous medium metasurface Portrait wave frequency dispersion relation calculation method and system, and the method comprises the following steps: obtaining expressions of solid skeleton displacement, fluid relative displacement, total stress, solid shear stress and pore pressure under the action of Portrait waves; obtaining an expression of a fluid displacement component and a fluid normal stress; obtaining an expression about the relative motion of the resonator; according to all the expressions, stress and displacement continuity boundary conditions are applied to the interface of the saturated porous medium and the fluid layer, a characteristic equation of frequency dispersion characteristics is obtained and solved, and a frequency dispersion curve is obtained. According to the method, the explicit frequency dispersion relation of the saturated porous medium metasurface portrait waves is provided, the calculation efficiency and prediction precision of complex interface wave propagation are improved, the optimal design of the metasurface resonator array can be guided, and a key theoretical tool and technical support are provided for design of high-performance acoustic functional devices and structures.

The invention discloses a non-linear static analysis method for influence of blasting vibration on surrounding buildings based on field measurement vibration velocity, and belongs to the technical field of engineering blasting. The safety evaluation method comprises the following steps: step 1, field detection and data acquisition; the vibration velocity condition of the target structure and a blasting seismic wave velocity vibration curve of the blasting at the target structure are obtained; 2, calculating a structure inelastic quasi-absolute acceleration-relative displacement SA, e-SD, e curve, namely a demand curve of a target structure; 3, establishing a multi-degree-of-freedom structure model, performing static pushing analysis on the multi-degree-of-freedom structure model to obtain a load and displacement response relation V-D curve of the structure, and performing deformation to obtain a capacity curve of the equivalent SDOF structure; and 4, moving the demand curve and the capability curve of the target structure into the same coordinate system, wherein the intersection point of the demand curve and the capability curve reflects the local damage condition of the structure. By adopting the method, whether the structure is integrally damaged or not can be judged, and the local damage condition and position can be analyzed.

The invention provides a copper foil thickness analysis method and device. The copper foil thickness analysis method comprises the steps that tension values of all layer number positions and thickness measurement results of the corresponding layer number positions in the copper foil winding process are obtained; analyzing a deformation mechanism by combining the obtained interlayer relative displacement and torsion angle according to the compression deformation analysis result to obtain stress distribution mode data; compensating thickness measurement data based on the stress distribution mode data to obtain compensated thickness measurement data; setting a normal thickness range and an anomaly judgment threshold based on the compensated thickness measurement data, and determining a sensitivity identification threshold parameter of thickness anomaly detection; judging a thickness anomaly state according to the sensitivity identification threshold parameter of the thickness anomaly detection to obtain a thickness anomaly detection result; and in combination with the thickness anomaly detection result and historical winding process thickness measurement data, thickness anomaly detection combination parameters are determined.

The invention discloses a concrete wall full-section deformation monitoring device and method, and relates to the technical field of engineering structure health monitoring, and the device comprises an integrated measurement unit, a passive stable characteristic target group and a processing unit. The integrated measuring unit is composed of an area array solid-state laser radar and a high-resolution binocular vision camera which are rigidly and fixedly connected, and is used for synchronously collecting three-dimensional point cloud and two-dimensional images of a wall and an environment. The target group is arranged on an independent stable object near the wall body; the processing unit identifies coordinates of the target group based on laser radar data, establishes a world coordinate system, calculates self pose drift of the measuring unit by periodically detecting position change of the target, and performs coordinate correction on a wall surface relative displacement field obtained by visual calculation by using the drift distance; and finally, outputting a full-section absolute deformation field under a world coordinate system. According to the invention, high-precision monitoring of full-field continuous deformation of the concrete wall is realized, and the reliability and comprehensiveness of structural health monitoring data are improved.

Provided is a ring type binding tool in which misalignment of two base plates and a sheath body in the longitudinal direction can be suppressed even when the sheath body is to be engaged with the two base plates through relative displacement in the longitudinal direction. In the ring type binding tool according to the present invention, each of base plate end locking claws (71) of two base plates (1, 2) has a base plate inclined side surface (71a) and a base plate positioning side surface (71b), and each of sheath end engaging claws (421) of a sheath body (4) has a sheath inclined side surface (421a) and a sheath positioning side surface (421b), and the base plate inclined side surface (71a) and the sheath inclined side surface (421a) are configured to allow the base plate end locking claws (71) to go over the engaging claws (421), and the base plate positioning side surface (71b) and the sheath positioning side surface (421b) are configured to abut against each other to regulate the relative displacement between the two base plates (1, 2) and the sheath body (4) in the longitudinal direction.

A three-dimensional displacement measuring system for a railway platform comprises a laser, an angle sensor, a high-magnification camera and an LED (light-emitting diode) illuminating lamp which are respectively arranged on a fixed upright post, the target is adhered to the edge of the platform to form a measurement reference surface, and the horizontal distance between the stand column and the target is a preset value; the system establishes a virtual zero point and defines a space rectangular coordinate system XYZ, the X axis is in the longitudinal direction of the platform, the Y axis is perpendicular to the edge of the platform, and the Z axis is vertically upward. The invention provides a non-contact, high-precision and low-power-consumption railway platform three-dimensional displacement measurement method, which comprises the following steps of: performing periodic laser scanning and image acquisition on a target adhered to the edge of a platform by utilizing a vision measurement system formed by double lasers and a high-magnification camera and combining feedback information of an angle sensor; and the relative displacement of the X axis, the Y axis and the Z axis in the space is inversely calculated through a geometric model. The method can automatically complete the whole-process operation of zero calibration, photographing, identification, calculation, storage and the like, and meets the actual requirements of long-term structure monitoring of the railway platform.

The utility model relates to the technical field of construction safety, and provides a steel structure corridor construction edge protection device which comprises a plurality of protection units sequentially arranged at intervals in the length direction of a steel structure beam wing plate and protection pieces connected between the protection units in series. The protection unit comprises a stand column, a bottom plate, a transverse supporting piece, a clamping piece, a transverse adjusting piece and a vertical adjusting piece. The two ends of the transverse supporting piece extend out of the two sides of the steel structure beam wing plate to form cantilever ends. The two clamping pieces are movably hung at the overhanging ends of the transverse supporting pieces respectively. The transverse adjusting piece is movably connected with the transverse supporting piece and used for limiting transverse relative displacement of the two clamping pieces. The vertical adjusting piece is used for limiting the vertical relative displacement of the clamping piece and the steel structure beam wing plate. By adopting the mode of clamping and fixing with the two sides of the I-shaped steel wing plate, the safety protection performance is high, and the structure is more stable.

The utility model relates to an adjustable ocean platform trestle, and belongs to the field of ocean platform trestles. The trestle body comprises a trestle baffle, trestle side plates and a trestle main box body, and the trestle side plates are provided with guide rails; the adjusting base comprises a base outer plate, a guide wheel, a cushioning spring, a supporting plate, a hydraulic device and a bottom plate, one end of the cushioning spring is installed on the side wall of the base outer plate, the other end of the cushioning spring is connected with the guide wheel, and the guide wheel is matched with the guide rail and used for adjusting transverse displacement of the trestle body; the supporting plate is provided with a limiting groove, the trestle baffle can be installed on the bottom plate through the limiting groove and one end of the hydraulic device, and the other end of the hydraulic device is matched with the trestle baffle to adjust longitudinal displacement of the trestle body. The connecting device can be applied to the connection of the self-elevating platform and the unmanned wellhead platform so as to meet the maximum relative displacement requirement of the unmanned wellhead platform and the self-elevating platform and guarantee the connection of a trestle and an oil pipe hose and the safe passage of workers.

According to the gantry machine tool, two heightening blocks distributed in the first horizontal direction are arranged on a base, two stand columns of a gantry frame are arranged on the two heightening blocks in the second horizontal direction in a sliding mode respectively, and therefore on the premise that it is guaranteed that the height of a machining module is fixed, the machining efficiency is improved, and the machining efficiency is improved. The height of the stand columns of the portal frame can be set to be smaller, so that the stability of the portal frame of the portal frame rack in the working process is improved; meanwhile, the displacement of the machining platform and the displacement of the portal frame in the second horizontal direction can be set to be smaller, so that the structure of the whole gantry machine tool in the second horizontal direction can be set to be smaller, and the machining efficiency is improved under the same occupied space. And the relative displacement of the machining module arranged on the portal frame and the to-be-machined workpiece placed on the machining platform in the second horizontal direction is larger, so that the gantry machine tool can machine larger products.

The invention provides a finite element simulation method and device for a strike-slip fracture stratification deformation process, and relates to the technical field of geological structure deformation simulation research, the method comprises the steps that a strike-slip fracture stratification initial geometric model is established, the strike-slip fracture stratification initial geometric model is used for reflecting actual geological conditions, and the strike-slip fracture stratification initial geometric model is used for simulating the actual geological conditions; corresponding rock stratum material attributes are given to the strike-slip fracture layering initial geometric models corresponding to different stratums; setting a rigid body shell according to corresponding binding constraints between stratums, binding the rigid body shell to the bottom of the strike-slip fracture layering initial geometric model, endowing the rigid body shell with relative displacement of a preset distance, and simulating strike-slip fracture layering deformation according to preset analysis steps by adopting displacement loading control; in the analysis step, target information is output according to a preset output information type; according to the target information, a visual simulation result is created, and the visual simulation result is used for representing the stratified deformation evolution process of strike-slip fracture.

The invention relates to the technical field of building material performance detection, in particular to an integrated house steel structure performance detection method and system, and the method comprises the steps: 1, constructing a full-period load spectrum; step 2, multi-stage load simulation; step 3, multi-source dynamic monitoring: arranging a strain gauge array at a plugging node to capture a micro strain gradient, measuring three-way relative displacement through a cross-joint laser displacement group, and positioning a crack signal by adopting an acoustic emission sensor array; step 4, damage coupling analysis: aligning multi-source monitoring data to generate a space-time matrix, calculating a fatigue damage factor, a connection failure factor and a crack propagation factor, and inputting a neural network model to output a damage thermodynamic diagram; and step 5, performance degradation evaluation: combining the damage thermodynamic diagram and the load occurrence frequency to calculate the remaining life and generate a maintenance list. According to the method, through combination of an advanced monitoring technology and an intelligent analysis method, accurate monitoring and performance evaluation of the whole life cycle of the house steel structure are realized.

The invention discloses a nonlinear static analysis method and system for the influence of blasting vibration on surrounding buildings based on acceleration, and belongs to the technical field of engineering blasting, and the safety evaluation method comprises the following steps: 1, carrying out on-site detection and data acquisition to obtain blasting acceleration characteristics and a blasting seismic wave acceleration vibration curve of the blasting; 2, calculating an inelastic quasi-absolute acceleration-relative displacement SA, e-SD, e curve of the structure, namely a demand curve of the structure; 3, establishing a multi-degree-of-freedom structure model, performing static pushing analysis on the multi-degree-of-freedom structure model to obtain a load and displacement response relation V-D curve of the structure, and performing deformation to obtain a capacity curve of the equivalent SDOF structure; and 4, moving the demand curve and the capability curve of the structure into the same coordinate system, wherein the intersection point of the demand curve and the capability curve reflects the local damage condition of the structure. By adopting the method, whether the structure is integrally damaged or not can be judged, and the local damage condition and position can be analyzed.

The utility model provides an electronic expansion valve which comprises a valve seat assembly and a guide seat. The valve seat assembly is provided with a valve cavity, and the valve cavity is provided with a first valve port. At least part of the guide seat is arranged in the valve cavity and is fixedly connected with the valve seat assembly; wherein one of the valve seat assembly and the guide seat, which is higher in material hardness, is provided with a positioning bulge, the positioning bulge is pressed against the other one of the valve seat assembly and the guide seat, and the material hardness of the positioning bulge is greater than that of the valve seat assembly or the guide seat which is propped against the positioning bulge, so that the valve seat assembly and the guide seat are positioned in the axial direction and the circumferential direction. Through the structural design, relative rotation of the guide seat and the valve seat assembly in the circumferential direction or relative displacement in the axial direction can be avoided, and reliable positioning of the guide seat is achieved.

The invention provides a railroad bridge intelligent seismic mitigation and isolation system, and relates to the technical field of railroad bridge engineering, the railroad bridge intelligent seismic mitigation and isolation system comprises a seismic mitigation support arranged on a bridge, the seismic mitigation support comprises a first seat body, a second seat body, a third seat body, a fourth seat body, a first limiting assembly and a second limiting assembly, the first seat body is slidably connected with the second seat body, and the second seat body is slidably connected with the third seat body; the fourth seat body is connected between the second seat body and the third seat body in a sliding mode, the first limiting assembly limits relative displacement of the first seat body and the second seat body, and the second limiting assembly limits relative displacement of the second seat body and the third seat body. The first limiting assembly and the second limiting assembly cut off and release the displacement constraint under different earthquake intensities, graded damping is achieved in combination with the multi-direction sliding structure, the displacement constraint can be released in a graded mode according to the earthquake intensities, and track structure safety and bridge main body structure protection are effectively balanced.

A pedal-assisted bicycle includes a suspension system of the rear wheel in relation to the frame which allows a predetermined relative displacement between them. The crankset includes: a freewheel device operatively interposed between the drive and muscle shafts; a compensating device operatively interposed between the drive shaft and the gear wheel, The compensating device generates between the two an angular forward compensation stroke between a rest position, and a compensation position, where the forward compensation stroke is limited to a predetermined angle and is opposite to the free stroke of the freewheel device.

The invention discloses a self-resetting device capable of limiting in the transverse bridge direction and preventing a beam from falling in the longitudinal bridge direction and a manufacturing method. The self-resetting device comprises a first connecting structure, a second connecting structure and an energy consumption self-resetting assembly. The first connecting structure comprises an upper bottom plate; the second connecting structure comprises a lower bottom plate, two oppositely-arranged L-shaped steel plates are fixedly connected to the upper portion of the lower bottom plate, and sliding grooves are formed in the opposite sides of the two L-shaped steel plates. The energy consumption self-resetting assembly comprises a round rod, the two ends of the round rod are fixedly connected with steel balls respectively, the round rod is sleeved with an inverted-T-shaped sliding block, the inverted-T-shaped sliding block is in sliding connection with the round rod, the round rod is fixedly connected with two square steel plates, and a spring is arranged between each square steel plate and the inverted-T-shaped sliding block. The round rod between the steel ball and the square steel plate is slidably connected into the sliding groove of the L-shaped steel plate. The self-resetting device can effectively solve the problem of temperature fatigue damage of the damper in the daily operation stage, and can provide self-resetting capacity while effectively controlling the relative displacement of the pier beam under the action of an earthquake.

The invention belongs to the technical field of quasi-zero stiffness vibration isolators, and particularly discloses a self-adaptive adjustment quasi-zero stiffness vibration isolator and a control method. Comprising a base and a bearing plate, and a plurality of positive stiffness units are arranged between the base and the bearing plate to provide basic support; the negative stiffness unit is arranged below the bearing plate, the two ends of the negative stiffness unit are connected with the adjusting structure through the moving unit capable of moving in the length direction of the driving unit, the adjusting structure is composed of a lead screw and an adjusting motor, the projection length of the negative stiffness unit in the horizontal direction can be changed, and therefore continuous adjustment of the negative stiffness is achieved. The vibration isolator is further provided with an acceleration sensor, a relative displacement sensor and a rotary encoder, and the sensors are connected with a processing unit to form a real-time monitoring and feedback control system. The low-frequency vibration isolation device can keep stable low-frequency vibration isolation performance under the condition change, and is suitable for high-precision equipment and complex industrial vibration environments.

The invention provides a static three-component coefficient determination method and device, electronic equipment and a storage medium, and relates to the technical field of cable-stayed bridges, and the method comprises the steps: collecting target images of a target rigid segment model at a plurality of wind speeds after the target rigid segment model is steady; for each wind speed, according to the circle center position of a first target circle and the circle center position of a second target circle in the target image, the relative displacement of the target rigid segment model under the wind speed and the target rigid segment model under the target wind speed is determined; and obtaining a static three-component coefficient of the target rigid segment model according to the relative displacement and the conversion relation between the displacement and the force. According to the scheme provided by the invention, a high-precision force measuring balance is prevented from being used for determining the static three-component coefficient, so that the experiment cost is reduced, the installation difficulty of the experiment is reduced, and the experiment efficiency is improved.

The invention discloses a cascade metasurface-based dual-function tunable optical device and a design method, and relates to the technical field of tunable metasurfaces. According to the optical device, high-refractive-index medium nano-columns with different sizes are arranged on an upper low-refractive-index medium substrate and a lower low-refractive-index medium substrate according to a specific mode to form a cascade metasurface structure, an upper metasurface and a lower metasurface included in the cascade metasurface have independent 2pi phase regulation and control capabilities under two kinds of orthogonal polarized light, and the two layers of metasurfaces have independent 2pi phase regulation and control capabilities under two kinds of orthogonal polarized light. Two wavefront regulation and control functions of polarization multiplexing can be realized; furthermore, the cascaded metasurface device adopts a mechanical tuning mode, and dynamic tuning of a double-wavefront regulation and control function can be realized by controlling relative horizontal displacement between the upper and lower layers of metasurfaces. Wherein the total phase of the cascaded metasurface is represented as a dynamic functional phase 1 under the polarization state 1, and is represented as a dynamic functional phase 2 under the polarization state 2. According to the invention, the double-layer structure design of the cascade metasurface is adopted, the total phase of the cascade metasurface is a dynamic deflection phase under X polarization by taking the functions of light beam dynamic scanning and a zoom lens as examples, and the displacement-related light beam deflection can be realized under different relative displacement conditions; and under Y polarization, a dynamic focusing phase is presented, and focal length adjustment along with relative displacement change can be realized. That is, the cascaded metasurface is an optical device which realizes dual-function dynamic tuning through horizontal displacement.