418 results about "Relative displacement" patented technology

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 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.

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 discloses a side slope three-dimensional deformation monitoring and early warning method and system based on a cascade single-line multipoint crack meter. The method and system are suitable for deformation monitoring and landslide state forecasting of a side slope area without macroscopic cracks. The method comprises the steps that a monitoring main line is planned in a potential slip area in the main slip direction, intelligent fusion nodes are arranged on the main line, multi-direction monitoring branch lines are led out, and a tree-shaped monitoring network is formed; two ends of the main line are anchored in a stable area, and tail ends of the branch lines are fixed on a slope; the node devices synchronously collect relative displacement and three-dimensional attitude data in the main line direction and the branch line direction, a three-dimensional deformation field is built in combination with an early warning model, and landslide state study and judgment and threat range prediction are achieved. The system achieves multi-point and multi-direction displacement monitoring through a tree-shaped structure, has the advantages of being wide in coverage, low in cost, flexible in arrangement and the like, and supports early-stage automatic early warning of slope disasters.

The utility model discloses a clamping force variable type material carrying device which carries and conveys materials from a first position to a second position and comprises a clamping tool used for clamping the materials, the bottom of the clamping tool is fixed relative to the moving end of a conveying line, and the clamping tool comprises a first tool clamping jaw and a second tool clamping jaw which are arranged oppositely. Elastic mechanisms used for driving the clamping jaws to move relatively are arranged on the opposite sides of the first tool clamping jaw and the second tool clamping jaw, and an opening mechanism used for opening the first tool clamping jaw and the second tool clamping jaw to clamp materials is arranged at the first position. A clamping and positioning mechanism used for positioning the positions of the first tool clamping jaw and the second tool clamping jaw to keep the positions of the materials uniform is arranged at the second position; according to the utility model, the uniqueness of the position of a product is ensured by a mechanism for preventing relative displacement of materials during the movement of a conveying line and the movement of the turntable, so that the stable production of equipment is realized, and the production efficiency of the equipment and the qualification rate of the product are improved.

The invention discloses an inter-ridge strawberry disease inspection robot structure and a control method thereof. The inter-ridge strawberry disease inspection robot structure comprises a lifting platform structure, a lateral telescopic mechanism, a camera pitching mechanism, a steering wheel moving mechanism and an independent suspension structure. The steering wheel moving mechanism is located at the bottom of the robot and makes direct contact with the ground. The independent suspension structures are installed on the two sides of the steering wheel moving mechanism and can move relative to the steering wheel moving mechanism. The lifting platform structure is located in the middle of the robot and connected with the independent suspension structure through bolts, a lateral telescopic mechanism is installed on the lower portion of the lifting platform structure, and the extension direction of a telescopic arm is perpendicular to the advancing direction of the robot. The camera pitching mechanism is installed at the tail ends of the outer sides of two telescopic arms of the lateral telescopic mechanism, and the two cameras detect the outer side of the robot. According to the invention, through real-time calculation and feedback of errors, the performance of the robot in an unstructured field environment is significantly improved.

A linear actuator with a force sensing mechanism comprises: a housing body (10) with a mounting component (11); a transmission mechanism (20) connected to the housing body (10) and comprising a constraint component (21); an elastic body (30) arranged between the mounting component (11) and the constraint component (21); and a Hall sensor set (40) arranged between the mounting component (11) and the constraint component (21); wherein, when a force applied to the transmission mechanism (20) is changed, a relative displacement is generated between the constraint component (21) and the mounting component (11), and thus an output signal is generated by the Hall sensor set (40) due to the displacement.Accordingly, benefits are provided such as preventing equipment damage due to impacts and detecting whether a patient is in a bedridden or unconscious state at a desired time.

The invention discloses a telescope main reflection surface shape real-time evaluation and on-demand adjustment integration method. An adjustment reference attitude and a reference temperature field are used as error zero points, and the whole process is calculated based on relative quantity. A gravity deformation database, a three-dimensional Chebyshev (or Legendre) temperature basis function unit response deformation database and a temperature control actuator unit temperature change influence matrix database are established offline. Regular least square fitting is performed on temperature sensor data on line to obtain a temperature coefficient, linear combination is performed to obtain relative displacement caused by temperature, the relative displacement and relative displacement caused by gravity are superposed to form relative node coordinates, and a reference surface is fitted to output a surface shape relative RMS. And solving quadratic programming based on first-order linearization under temperature upper and lower limits and smoothness constraint to obtain an actuator temperature increment instruction, and issuing the actuator temperature increment instruction, thereby realizing closed-loop compensation without online thermal-structural coupling and absolute morphology measurement.

A valve device (30) is provided with a cylindrical passage-forming member (40) and a cylindrical spool valve (60) that is slidable with respect to the passage-forming member (40). The passage-forming member (40) has a communication port (56) that communicates the inside and the outside in the radial direction. The slide valve (60) has at least one cut portion (62, 63) cut from one end surface (61) in the axial direction (Rs). The degree of communication of the cutout portions (62, 63) with respect to the communication port (56) can be adjusted by relative displacement of the spool valve (60) with respect to the passage forming member (40).

The invention provides a nonlinear dynamic modeling, solving and control method of a linear motor, and belongs to the field of structural dynamics, and the method comprises the steps: 1) simplifying an LRA into a two-degree-of-freedom mass-spring-damping nonlinear system, and obtaining the linear stiffness and cubic nonlinear stiffness of a beam spring; (2) nBgleff discrete data points of different relative displacements of the motor vibrator and the shell are obtained through simulation, an nBgleff fitting curve is obtained, and then electromagnetic force is obtained; 3) identifying system damping parameters by combining measured data; according to the method, the goodness of fit Rnl of the model to the LRA vibration response is larger than 0.95, vibration characteristics can be accurately predicted, the LRA vibration consistency is effectively improved through the control strategy, and the tactile feedback experience is improved.

The application relates to a mechanical temperature self-adaptive pier beam longitudinal constraint structure, which comprises a pier, a main beam arranged above the pier, an auxiliary beam installed on the top of the pier, the auxiliary beam being capable of being elongated or shortened under the action of system temperature and being located between the pier and the main beam, a displacement lever, one end of the displacement lever being hinged to the auxiliary beam through a first rotating shaft, the other end of the displacement lever being hinged to the main beam through a second rotating shaft, and the part of the displacement lever between the first rotating shaft and the second rotating shaft being hinged to the pier through a third rotating shaft. Under the action of system temperature, the main beam and the auxiliary beam are respectively elongated or shortened, and the displacement lever only rotates synchronously, so that the temperature internal force of the main beam and the pier frame structure is released. Under the action of other loads, the main beam and the pier are connected through the auxiliary beam and the displacement lever, and when the main beam needs to be relatively displaced, the auxiliary beam and the displacement lever can constrain the horizontal deformation of the main beam and the pier, so that the main beam and the pier form a frame structure to jointly bear loads.

A multi-parameter sensing and bearing integrated structural plate for space is characterized by comprising a front panel, an inner plate, an outer frame, a distributed optical fiber sensor, a vibration sensor, a multi-core photoelectric connector and a pressure sensor. The inner plate is embedded in the outer frame, and the four corners of the inner plate are each provided with a pressure sensor. A plurality of honeycomb grooves are formed in the upper end surface of the inner plate; vibration sensors are fixed in part of the honeycomb grooves; a multi-core photoelectric connector is fixed at one angular position of the inner plate; each vibration sensor is connected with the multi-core photoelectric connector; the front panel covers the inner plate, and a distributed optical fiber sensor is fixed on the lower end face of the front panel. According to the structural plate, various sensors are mounted in the structural plate in a nesting and stacking manner, so that the structural plate can measure various parameters; and meanwhile, the structural plate directly transmits the pressure to the mounting main body through the outer frame, so that a stroke gap is eliminated, and the pressure sensor does not need to generate relative displacement and directly measures the external absolute pressure amount.

The invention discloses a testing device and a testing method for a cut-off end of a stringer of a wallboard structure of a high-load aircraft. The testing device and the testing method are suitable for testing the mechanical property of a wallboard test piece comprising a skin and at least one stringer cut-off end. According to the device, lateral supporting assemblies are arranged on the two sides of a test piece, lateral constraint is provided for the wallboard test piece, axial relative displacement is allowed, and the single stringer wallboard test piece is used for equivalently simulating simple support boundary conditions on the two sides of an actual stiffened wallboard; the lateral supporting assembly comprises an L-shaped base, a connecting flat plate and a sliding supporting piece, the L-shaped base is connected with the testing machine through bolts, and the sliding supporting piece abuts against the side edge of the wallboard testing piece to form lateral supporting; according to the optimal position of the sliding supporting piece, a single stringer wall plate test piece obtains the maximum bearing capacity and the damage form which are consistent with those of a plurality of stringer wall plate test pieces under the action of a tensile load in a lateral supporting mode.

The invention relates to the technical field of building construction, and discloses a device and a method for testing the perpendicularity of an underground connecting wall. The underground connecting wall perpendicularity testing device comprises a detection assembly, a regulation and control assembly and an acquisition control assembly, the detection assembly is fixedly installed in the sounding pipe or the reinforcement cage, acceleration parameters of all detection points can be collected in real time in the lowering process of the reinforcement cage, and therefore the motion states and displacement changes of the reinforcement cage at different depth positions are obtained, and dynamic monitoring of the construction process is achieved; the acquisition control assembly calculates the transverse inclination angle of the reinforcement cage and the relative displacement of each measuring point in real time according to the acceleration parameters, and when it is detected that the posture of the reinforcement cage deviates from the preset perpendicularity range, the regulation and control assembly can be automatically controlled to adjust the posture of the corresponding position, deviation is effectively corrected, and the lowering precision of the reinforcement cage is improved. The underground structure construction quality is improved.

The invention provides a cabin door sealing device of a main hull and superstructure elastic connection transition area, which comprises a main hull, a superstructure and a transition area, the transition area is positioned between the main hull and the superstructure, and the cabin door sealing device is characterized in that a door opening structure is arranged on the main hull; a first opening is formed in the position, corresponding to the door opening structure, of the superstructure, the door opening structure penetrates through the first opening, and a cabin door is installed on the door opening structure; a sealing assembly is arranged at the joint of the main hull and the external structure of the superstructure and used for preventing an external liquid medium from entering the transition area. The cabin door is installed on the door opening structure penetrating through the first opening, so that the cabin door does not make direct contact with the superstructure, and the relative displacement between the main ship body and the superstructure does not affect the cabin door only installed on the main ship body; meanwhile, external liquid media are prevented from entering the transition area through the sealing assembly.

The utility model relates to the field of automobile interior door panel assembly, in particular to an assembly positioning structure and an automobile interior door panel, which comprise a positioning buckle seat, a nest groove is arranged on the side surface of the positioning buckle seat, an opening is arranged at the top of the positioning buckle seat, the orientation of the opening is opposite to the orientation of the nest groove, and the angle between the orientation of the opening and the orientation of the nest groove is 110-170 degrees. By means of the scheme, the problems that an existing positioning buckle base is poor in positioning effect, and after positioning, the automobile interior door panel still can generate transverse relative displacement relative to an automobile door panel metal plate are solved.

The invention relates to the technical field of waterproof material quality detection, in particular to a waterproof roll process state measuring device and method. A surface height sequence measured through laser and contact is synchronously collected, and a surface fabric texture signal and a fabric structure compression fluctuation signal are determined; firstly, the relative displacement of the melt fabric is quantified by utilizing delay correlation between the two, so that the macroscopic process deviation caused by speed mismatch is directly identified; a nonlinear morphology residual error signal is stripped through translation correction and linear gain modeling, and the physical form of the defect is identified according to an amplitude distribution form characteristic value, so that local mutation caused by unplasticized particles and system smooth defects caused by excessive casting are effectively distinguished; the high-frequency texture attenuation rate and the linear correlation degree determined by the frequency domain transfer function are combined, and the microscopic reproduction capability of the melt is quantified to reflect the rheological state characteristics of the melt, so that single thickness detection is expanded into multi-dimensional feature decoupling diagnosis, and the accuracy of waterproof roll process state determination is improved.

The utility model discloses a push type telescopic shoe support which comprises a supporting plate and a track, the supporting plate is installed on the track in a sliding mode, balls are arranged between the track and the supporting plate, a push type telescopic mechanism is arranged on the track and comprises a push rod, one end of the push type telescopic mechanism abuts against a first limiting face of the track, and the other end of the push type telescopic mechanism abuts against a second limiting face of the track. The other end of the pressing type telescopic mechanism is aligned with the supporting plate pushing surface; the supporting plate is pressed to enable the pushing face to extrude the pressing type telescopic mechanism, the pressing type telescopic mechanism pops up the push rod under extrusion, the push rod reversely impacts the pushing face, and the supporting plate and the rail generate relative displacement. The supporting plate is pressed to enable the pushing surface to extrude the push rod to be retracted into the pressing type telescopic mechanism, and the supporting plate and the track are reset, so that the traditional manual stretching operation mode is changed, a user can easily realize the stretching of the supporting plate only by pressing the supporting plate, and the operation is more convenient and labor-saving; the friction between the supporting plate and the track is effectively reduced through the arrangement of the balls, and meanwhile the supporting plate slides more smoothly.

The invention relates to the technical field of aerospace, in particular to a method for calculating the sea-launch take-off drift distance of a carrier rocket. The method comprises the steps that a launching platform shaking model is established under a launching platform body coordinate system, and a launching platform rolling angle and a launching platform pitching angle are obtained; establishing a carrier rocket vector form dynamical model under a carrier rocket body coordinate system to obtain the attitude angular velocity of the carrier rocket and the displacement of the carrier rocket mass center; obtaining relative displacement of a launch vehicle tail observation point and a launch platform motion reference point under a launch point gravity coordinate system according to the launch platform rolling angle, the launch platform pitching angle, the attitude angular velocity of the launch vehicle and the displacement of the launch vehicle mass center; and according to the relative displacement, obtaining the synthetic drift distance of the carrier rocket tail observation point relative to the launching platform under the body coordinate system of the launching platform. The method can reduce the prediction error of the sea-launch take-off drift distance of the carrier rocket, and meets the sea-launch high safety margin requirement.

The utility model relates to a numerical control machine tool main shaft end relative displacement detection device comprising a pedestal support fixed with a numerical control machine tool workbench; the measuring head base is arranged above the base bracket; a wired measuring head and a blowing nozzle are arranged on the measuring head base, and a measuring rod is arranged on one side of the wired measuring head; and the end cover protective cover is arranged on the outer side of the measuring head base and is used for protecting the wired measuring head. And the protective cover moving mechanism is arranged on the base bracket, is connected with the end cover protective cover, and is used for driving the end cover protective cover to horizontally slide towards the direction of the measuring rod. The device can be directly installed and fixed on the working table of the numerical control machine tool without changing the original structure of the numerical control machine tool, and is simple to implement and deploy; an operator calls a detection program through common codes of the numerically-controlled machine tool, the position deviation of the spindle end of the numerically-controlled machine tool can be measured, operation is convenient, and the machining precision of the numerically-controlled machine tool can be greatly improved.

The application relates to the technical field of cable connectors, in particular to a cable connector which comprises a male head, a female head and a cable main body, a fixing assembly is arranged between the male head and the female head, a cavity is arranged in the male head, the cable main body passes through the cavity, a fixing plate is arranged between the outside of the cavity and the cavity, and one end of the fixing plate is mounted on the inner wall of the cavity. The fixing plate and the adjusting assembly are arranged, the movement of the driving rod in the sliding groove can drive the push block to push the fixing plate, the arc-shaped groove can be tightly combined with cable main bodies with different diameters, and the fixing requirements of diversified cables can be met; meanwhile, the fixing plate length design and the cooperation of the adjusting assembly can enhance the clamping force on the cable, reduce the relative displacement between the cable and the connector inside during long-term use or external force vibration, reduce the risk of poor contact or abrasion, and guarantee stable conductive performance.

The invention relates to the field of bridge damping, in particular to a near-fault bridge anti-seismic toughness improving device and a test method thereof.The bridge comprises T-beams, a cover beam, a diaphragm plate between every two adjacent T-beams and an ECC column located between the two T-beams; two pairs of SMA disc spring devices are arranged on the ECC column body, one pair of SMA disc spring devices are arranged towards the T beam, and the other pair of SMA disc spring devices are arranged towards the transverse partition plate; the SMA disc spring devices are used for enabling the T beams to recover to the initial positions through the recovery characteristic of the SMA disc spring devices after relative displacement of the bridge in the transverse bridge direction occurs, and the ECC column is arranged between the two T beams of the bridge, so that the T beams can be recovered to the initial positions. The limit tensile strain of the ECC (fiber cement-based composite material) material can reach more than 200 times that of the traditional concrete, and the ECC material is accompanied by the multi-crack cracking phenomenon of fine cracks, so that the strain hardening characteristic of a similar metal material under the tensile effect is formed, and the structural deformation caused by earthquakes can be effectively dealt with.

The invention discloses a case rear beam assembly control method based on displacement monitoring, and the method comprises the steps: S1, arranging a displacement sensor array at each connection part or in a preset positioning groove of a splicing structure of multiple metal beam sections of a case rear beam, and enabling the displacement sensor array to be used for measuring the relative displacement between the splicing sections; s2, connecting the displacement sensor array to a central processing controller through a bus; s3, in the assembling process, the central processing controller periodically collects displacement data measured by the displacement sensors according to an adjustable sampling period, and real-time signal filtering processing including at least one of moving average filtering and median filtering is carried out on the collected data so as to suppress noise interference; s4, comparing the filtered displacement data with pre-stored standard model data through a central processing controller, and calculating at least one assembly deviation in the axial direction, the radial direction and the angle; and S5, whether the assembly deviation exceeds a preset dynamic threshold value or not is judged, and a judgment result is obtained.

The invention provides a tube bundle type stress buffering device, which relates to the technical field of pipeline stress buffering, and comprises a tube bundle assembly and two interface assemblies, the two interface assemblies are suitable for being in fluid communication with two external devices respectively; the pipe bundle assembly comprises a plurality of bent pipelines arranged in parallel, and each bent pipeline is connected between the two connector assemblies and is constructed to achieve fluid communication between the two external devices, absorb relative displacement between the two external devices through elastic deformation of the bent pipeline and buffer stress generated by the relative displacement. A plurality of bent pipelines are arranged to replace a single thick-wall pipeline, due to the fact that the caliber of a flow channel is reduced, the thickness of the pipe wall is allowed to be reduced on the premise that the pressure-bearing strength is met, meanwhile, the overall deformation absorption capacity is improved, and the size and the weight of the stress buffering device are reduced.

The invention discloses an O-shaped ring quick-changing structure of a driving unit of an inclined carrying device and a positioning method, and belongs to the technical field of plate glass manufacturing equipment. Comprising a driving shaft and an O-shaped ring mounting seat which are coaxially arranged, a driving shaft convex conical surface is arranged at the end part of the driving shaft; a concave conical surface is arranged at the butt joint end of the O-shaped ring mounting seat; the concave conical surface is in surface contact fit with the convex conical surface of the driving shaft to form a conical surface self-positioning system for realizing automatic centering between the driving shaft and the O-shaped ring mounting seat; a positioning piece used for limiting relative displacement in the rotating direction is arranged at the conical surface matching position of the concave conical surface and the convex conical surface; a magnetic anti-loosening disc is arranged at the end of the driving shaft, radial pre-tightening is generated on the matched conical surface through magnetic force, and a positioning and locking system linked with the positioning piece is formed. Through the synergistic effect of self-positioning of the conical surface, rotation prevention of the positioning pin and magnetic locking, the replacement time of the O-shaped ring is shortened from 15 min to 1 min, the positioning precision is improved to + / -0.02 mm, and breakthrough improvement of maintenance efficiency and equipment reliability is achieved.

The invention provides a thin film uncovering device and a thin film uncovering method. The device comprises a frame operation structure used for placing and moving a transfer frame, a base operation structure used for placing and moving a structure to be uncovered, a gluing operation structure used for forming bonding connection between the transfer frame and a thin film of the structure to be uncovered, and a control frame operation structure. And the control structure is used for automatic operation of the substrate operation structure and the gluing operation structure. Through the frame operation structure, the substrate operation structure and the gluing operation structure, the film of the to-be-peeled structure can be bonded with the transfer frame, the transfer frame and the to-be-peeled structure generate relative displacement, separation of the film and the substrate is achieved through automatic control, stress borne by the film during separation is evenly distributed and flat, and the separation efficiency is improved. The yield of thin film stripping and the repeatability of the process are improved; and meanwhile, the bonding force between the thin film and the transfer frame is improved by rolling the bonding connection position, and the falling risk of the thin film in the uncovering and transferring process is reduced.

The invention provides a simulation test method and device for static subsidence in marine prefabricated structure soil. The method comprises the steps that a fixed steel plate and a movable steel plate are arranged in a test box body; backfilling a soil layer capable of pre-burying the fixed steel plate and the movable steel plate into the test box body, and then injecting water into the test box body to simulate a seabed environment; the movable steel plate is driven by the lifting mechanism to be gradually separated from the soil layer, so that relative displacement is generated between the movable steel plate and the fixed steel plate, and the working condition of the fixed steel plate in static sinking in the soil layer is simulated; comprehensive pressure data transmitted by a soil layer and a water body and borne by the fixed steel plate are collected in real time through pressure sensing pieces arranged on the fixed steel plate; the device comprises a test box body, a fixed steel plate, a pressure sensor arranged on the fixed steel plate, a lifting mechanism and a movable steel plate which are used as physical carriers for implementing the method, according to the method and the device, the problem of lack of a simulation scheme for the static sinking process of the offshore engineering prefabricated structure in the prior art is solved.

The application relates to a device and a method for testing the bonding strength between a casing and well cement by using rotary torque, and belongs to the technical field of drilling material detection. The device comprises a test sample, a slip, a joint and a load applying device. Power is generated by a power device of a rotary dynamic torque tester to form rotary output, which drives a wellbore simulation casing to rotate. The wellbore simulation casing and a cement sheath fixed on a cementing cylinder are relatively displaced to form rotary torque. A torsion meter reads and records the torsion value when the cementing interface is damaged in real time, and the maximum value of the torsion value is taken as an index for representing the cementing strength. The device disclosed by the application is simple and convenient to operate, simple in structure, low in cost and reusable, and can be widely applied to the measurement and evaluation of the cementing performance of casings and well cement of different wellbore sizes.

The invention specifically discloses a relative orbit dynamics multi-dimensional ground simulation method using a ducted fan, and relates to the technical field of spacecraft ground simulation. According to the method, a ducted fan compensation platform is designed, the ducted fan compensation platform comprises a ducted fan, a main structure frame and a fan driving unit, the ducted fan compensation platform is integrally fixed to the air floatation simulator, and the method comprises the specific steps that a target spacecraft reference coordinate system and a simulator body coordinate system are established, and a space-time scaling model is determined; a simulator pose is obtained in real time through a pose measurement system; starting a jet system to generate relative displacement, and inversely calculating an actual space relative distance and a nonlinear acceleration by combining a C-W equation and a space-time scaling model; the ducted fan is controlled to provide xoy plane nonlinear compensation force, and z-axis direction compensation force is calculated through mathematical simulation coupling. The problem that a traditional air floating platform cannot simulate the dynamic characteristics and multi-dimensional motion of a spacecraft orbit is solved, and the precision of a spacecraft ground simulation test is remarkably improved.