33 results about "Bending strain" patented technology

A method for calculating the in-plane nonlinear deformation of an arch structure with axial defects in a Cartesian coordinate system is presented. This method is based on two states of the arch structure's curve element in the Cartesian coordinate system: an ideal axis and an actual axial defect. It derives the changes in the arc length and curvature of the curve element before and after deformation, obtaining expressions for the nonlinear compressive and bending strains in the in-plane of the arch structure with axial defects in the Cartesian coordinate system. The method also derives the nonlinear equilibrium differential equations in the in-plane of the arch structure with axial defects in the Cartesian coordinate system, obtaining solutions that satisfy the mechanical and geometric boundaries of the arch structure with axial defects. Finally, the method derives the nonlinear equilibrium governing equations in the in-plane of the arch structure with axial defects, ultimately obtaining the solution to the nonlinear mechanical problem in the in-plane of the arch structure with axial defects in the Cartesian coordinate system. This method can obtain the essence of the nonlinear mechanical problem of the arch structure with axial defects in the Cartesian coordinate system, filling the gap in the nonlinear strain-displacement expression for the in-plane of the arch structure with axial defects in the Cartesian coordinate system.

The invention belongs to the technical field of ship construction processes, and particularly discloses a detection method and an adjustment method for the centering state of a shaft system after ship launching, and the detection method specifically comprises the steps: carrying out the detection of the centering state of the shaft system after ship launching through the actual displacement and bearing load of a bearing in the to-be-detected shaft system before and after ship launching; a bearing load change value and an actual displacement change value caused by ship launching are obtained through calculation, and whether the shafting centering state is changed or not after ship launching is determined according to the bearing load change value and the actual displacement change value caused by ship launching; the actual displacement and the bearing load of the bearing in the to-be-measured shafting are obtained by the following steps: collecting the vertical bending strain of the shaft of the to-be-measured shafting at the strain measuring point, then calculating to obtain the actual vertical bending moment at the strain measuring point, and then calculating the actual displacement and the bearing load of the bearing in the to-be-measured shafting. On the premise that the construction difficulty and efficiency are not affected, the quality problem of shafting installation is controlled in the construction stage, and the shafting centering state of the naval vessel after being launched is greatly optimized.

The invention provides a hierarchical mixture design index and optimization method according to functional requirements of different pavement layers (a surface layer, a middle surface layer and a lower surface layer) in combination with climate zoning and traffic load characteristics. According to the method, key mechanical parameters (the dynamic stability of a surface layer is greater than or equal to 6000 times / mm, and the low-temperature bending strain of a lower surface layer is greater than or equal to 2500 mu epsilon) are determined according to the horizon function, and then the mineral aggregate gradation and the special asphalt dosage are optimized through coupling analysis of volume parameters (the void ratio is 3%-5%, and the mineral aggregate void ratio is greater than or equal to 17%) and mechanical properties. And meanwhile, a bonding layer interface shear strength test (greater than or equal to 1.2 MPa) is introduced, so that the structural integrity is ensured.

This invention discloses a stress-reducing fixing structure for a sliding rotor, relating to the field of shaft support structure technology. It includes a rotor body sleeved around the outer periphery of a main shaft. Multiple pressure-relief grooves are spaced circumferentially on the cylindrical wall of the rotor body. These grooves extend radially inward from the inner periphery and spirally along the shaft hole axis, creating a deformation avoidance space within the rotor body. Multiple flexible support arms are formed between adjacent pressure-relief grooves. When the main shaft is heated and generates a radial expansion greater than that of the rotor body, the flexible support arms are radially compressed by the main shaft and undergo elastic bending deformation into the pressure-relief grooves, converting radial displacement into bending strain. This adaptively absorbs and reduces the stress between the main shaft and the rotor body. This invention effectively solves the stress concentration problem caused by differences in thermal expansion coefficients under high-temperature conditions without changing the materials or sacrificing assembly rigidity and rotational accuracy, significantly improving the reliability and service life of the equipment.

The application discloses a kind of ultra-high strength automobile steel plate limit tip cold bending strain calculation method, system and equipment, and it is related to the field of automobile.Based on the relationship between the strain and bending angle provided by the application, the fracture strain under the limit tip cold bending working condition can be predicted according to the measured cold bending angle, so as to quantitatively evaluate the bending resistance of the material according to the cold bending angle-strain relationship.Further, the cold bending angle-strain relationship calculated by the method of the application can be input into the finite element simulation model, and directly used for the fracture toughness evaluation of parts and the CAE analysis of the whole vehicle.The relationship between the strain and bending angle provided by the application only needs to be substituted by the pressing displacement, sheet thickness and cold bending angle to solve the critical fracture strain of the material, that is, through the simple and easy-to-measure cold bending angle parameter, the complex limit tip cold bending fracture strain parameter is obtained, which solves the problem of difficult fracture strain measurement and reduces the equipment investment and time cost of actual production.

The invention relates to the technical field of bridge engineering, and provides a multi-objective intelligent optimization method for finished cable force of a cable-stayed bridge. The multi-objective intelligent optimization method comprises the following steps: establishing a finite element model of the cable-stayed bridge, and primarily homogenizing the cable force by adopting a minimum bending energy method according to a principle that the cable force of a long cable is large and the cable force of a short cable is small; constructing a support vector machine regression small sample proxy model based on a radial basis kernel function, carrying out cross validation and tuning on hyper-parameters by adopting grid search and a leave-one-out method, and representing a mapping relation between cable force and structural responses such as bending moment and displacement; establishing a multi-objective optimization model taking bending strain energy and resultant displacement as optimization objectives; according to the multi-target intelligent optimization method based on the double-optimal strategy, comprehensive optimal cable force and partial optimal cable force are used as guidance, common cable force is guided to approach to two types of excellent cable force, iterative optimization is adjusted through a direction factor and a strength factor, a Pareto optimal cable force candidate set is updated through non-dominated sorting, hypercube grids and a congestion degree strategy, and the optimal cable force is obtained. And finally obtaining a comprehensive optimal cable force as a finished cable force of the cable-stayed bridge.

The utility model belongs to mechanical analysis equipment technical field provides a kind of engineering component internal force analysis appearance, the engineering component internal force analysis appearance includes mandrel and multiple component module;Multiple component module is successively sleeved on mandrel and mutually abuts and forms engineering component model, and component module is slidably engaged with mandrel;At least the outer peripheral surface or axial end surface of two adjacent component modules is respectively provided with angle scale stripe and pointer stripe;The outer peripheral surface of each component module is provided with grid stripe.The engineering component internal force analysis appearance provided by the utility model, the position of angle scale stripe is pointed to by pointer stripe, and torsion angle is directly and intuitively shown, and then torsion strain is directly and intuitively shown;When simulating the bending condition of engineering component, component module will turn over outward, and the outer side portion is mutually far away, and then bending strain is directly and intuitively shown.

The application belongs to the technical field of strain type multi-dimensional force sensor, and discloses a six-dimensional force sensor with four L-shaped elastic beam structures and a strain gauge arrangement method, aiming to solve the core problems of strain dispersion, low sensitivity, serious inter-dimension coupling and large mechanical hysteresis of the existing six-dimensional force sensor. The elastic body is an integral structure, and the core includes an outer circular ring, a central loading platform and four L-shaped elastic beams connecting the two, the four L-shaped elastic beams are distributed at equal intervals of 90 degrees along the circumference of the outer circular ring, and the beam body is mainly subjected to directional bending deformation when loaded, so that a stable strain concentration area can be formed; 12 strain gauges are accurately attached to the maximum bending strain area of the beam body based on finite element simulation, and cooperate with the half-bridge double-working-piece Wheatstone bridge to realize six-dimensional force / torque measurement. The application can effectively reduce the inter-dimension coupling error and mechanical hysteresis, improve the measurement sensitivity and long-term stability, and is suitable for high-precision six-dimensional force measurement scenes such as industrial robot precision assembly, aerospace measurement and control, medical minimally invasive surgery and the like.

The invention relates to the technical field of optical fiber real-time monitoring, in particular to a steel structure platform health monitoring system and method based on optical fiber sensing, and the method comprises the following steps: respectively monitoring a steel beam and a bolt node of a steel structure platform by using an FBG strain sensor and a temperature sensor, and independently monitoring the bending strain of the steel beam by using an FBG curvature meter; after strain and temperature are decoupled, a real strain value is obtained, the steel beam curvature is measured by combining three gratings of a curvature meter, an eccentric threshold value is set, and when the steel beam curvature anomaly exceeds the eccentric threshold value, a steel beam deformation early warning is generated; the pre-tightening force loss rate is calculated by using the real axial strain of the bolt, the node state is dynamically evaluated by combining the curvature anomaly of the steel beam, a yellow alarm and a red alarm are set, maintenance is planned when the yellow alarm is triggered by the loss rate, and emergency disposal is performed when the red alarm is triggered. According to the system and method, thermal expansion and cold contraction errors are eliminated through strain and temperature decoupling, the bending degree of the steel beam is effectively evaluated by means of the FBG curvature meter, safety and stability of the platform are guaranteed, and a maintenance strategy is optimized.

The present application relates to the technical field of bridge engineering, and provides a cable-stayed bridge completion cable force multi-objective intelligent optimization method: a finite element model of the cable-stayed bridge is established, the minimum bending energy method is adopted, and the cable force is initially uniform according to the principle of "long cable force is large, and short cable force is small"; a small sample support vector machine regression proxy model based on a radial basis kernel function is constructed, grid search and leave-one-out cross-validation are adopted to optimize the super parameters, and the mapping relationship between the cable force and the bending moment, displacement and other structural responses is represented; a multi-objective optimization model with bending strain energy and combined displacement as optimization objectives is established; and a multi-objective intelligent optimization method based on a double optimization strategy is used to guide the general cable force to approach the two types of excellent cable forces, the iteration optimization is adjusted through a direction factor and a strength factor, the Pareto optimal cable force candidate set is updated through a non-dominated sorting, a hypercube grid and a crowding degree strategy, and finally a comprehensive optimal cable force is obtained as the cable-stayed bridge completion cable force.

The invention discloses a dynamic bending self-adaptive flexible connection electrophoresis insulation process, and belongs to the technical field of electrical insulation. According to the process, a miniature strain gauge is embedded in the surface of an electrical flexible connection main body, the dynamic bending strain is detected in real time, and the current bending curvature radius is calculated; the control unit dynamically adjusts the electric field intensity of the electrophoresis system according to a preset curvature-electric field mapping relation; the flexible connection main body is arranged in epoxy-silicon dioxide sol, the sol is directionally deposited under the action of an electric field to form an insulating layer, and the thickness of the insulating layer is dynamically adjusted along with the bending curvature radius and is in a negative correlation relationship. Self-adaptive distribution of the thickness of the insulating layer is achieved, the thickness is increased in a violent bending area to resist tensile stress, the thickness is reduced in a smooth area to maintain flexibility, and the insulation reliability and mechanical durability of flexible connection under the dynamic working condition are effectively improved.

An inertial-based method and system for detecting bending strain in a pipeline, a device, and a medium. The method comprises: acquiring position information of a pipeline of a preset length, collected by an IMU (S1); performing a wavelet transformation on the position information to obtain an initial target position information (S2); performing sliding filtering on the initial target position information through a sliding window according to a preset sequence and window width, and determining a data window at each sliding of the sliding window on the initial target position information (S3); determining a fit coefficient by the minimum mean squared error depending on the respective data windows (S4).Using a numerical value at the center of each data window as a filter value, determining a filter sequence based on the respective filter values ​​and the fit coefficient, and using the filter sequence as the second target position information (S5); determining a pipe bending strain force based on the second target position information (S6); detecting the pipe bending strain based on the pipe bending strain force (S7). This method removes noise twice, thereby improving the accuracy of the position information calculated by an inertial measurement unit (IMU) and solving the problem of noise affecting the position information calculated by the IMU.

A force detection bone screw device includes a bone screw body, a spring structure, a detection module, and an antenna module. The bone screw body includes a cylinder. The spring structure, the detection module and the antenna module are respectively arranged in the accommodation portion of the column. The spring structure includes a body, a bearing part, a fixing part and at least one bending strain structure. One end of the body is connected to the bearing part, and the other end of the body is connected to the fixing part, and the fixing part is fixed in the cylinder. Each bending strain structure is respectively provided on the body. The body has an axial direction, and each bending strain structure has deformation in at least one direction different from the axial direction. The detection module includes at least one strain element and a sensing component.

According to the present disclosure, an optical cable can be fixed such that the bending strain applied to the periphery of a portion of the optical cable from which an optical fiber is drawn is reduced. This optical panel (100) is provided with: a gripper (13) that grips an optical cable (22); the optical cable connector includes an optical cable (22), and a housing (10) in which an optical fiber (21) led out from the optical cable (22) is routed, the housing (10) is provided with a plurality of attachment portions (16), the gripper (13) has a plurality of fixing portions (46) capable of engaging with the attachment portions (16) of the housing (10), and the number of the attachment portions (16) is greater than the number of the fixing portions (46).

The application discloses a fiber acceleration detector based on a shape-variable cylinder and a method for detecting vibration acceleration. One end of the cylindrical shape-variable cylinder is used as a mounting end. Three axial grooves are arranged on the side wall of the shape-variable cylinder in a circumferential direction and are distributed at an angle of 120 degrees. An optical fiber with a certain pre-stress is fixed in each axial groove by using glue. A grating is engraved on the optical fiber. The shape-variable cylinder detector is mainly made of silica gel, is easy to deform, has good bending strain performance, and has higher sensitivity than common metal structures under the same conditions. The application has the advantages of convenient production, simple structure and accurate measurement.

A device for accurately measuring bending strain of a superconducting strand is provided. The bending strain precision measuring device includes a support frame. A driving mechanism is installed on the upper part of the support frame. An output end of the driving mechanism is sequentially connected with a weighing sensor and a pressure transmission module from top to bottom along the vertical direction. A bending strain module is installed on the lower part of the support frame. In a case that the output end of a driving mechanism moves downwards, the pressure transmission mechanism is capable of applying pressure to the superconducting strand placed on the bending strain module.

The invention belongs to the technical field of mine hydrogeology and engineering geology, and particularly discloses a method for calculating the permeability of an aquitard under a high hydraulic gradient condition, electronic equipment and a storage medium. Comprising the following steps: S1, determining initial parameters of an aquitard; s2, calculating bending strain of the aquitard caused by mining; s3, substituting the bending strain into a fracture expansion equation to calculate equivalent permeability; s4, substituting the equivalent permeability into a Forchhemer nonlinear flow equation, and solving the seepage velocity and pressure distribution under the high hydraulic gradient; s5, through iterative updating, the local pressure gradient and the flow velocity obtained through calculation are fed back to the fracture evolution equation at each time step, and the equivalent permeability and the hydraulic condition are updated until a steady state or a preset time step is reached; s6, parameter inversion is carried out, and it is ensured that a calculation result is consistent with a low-gradient experiment result k0. According to the invention, the dynamic evolution characteristics of permeability can be reflected, and the limitation of average permeability is overcome.

The titanium porous body according to the present invention is in a form of a sheet, and has a thickness of 0.3 mm or less, and a bending strain at break of 0.005 or more, wherein, for a three-dimensional surface texture of at least one surface of the titanium porous body, an arithmetic mean height Sa is 2.5 μm or less, a maximum height Sz is 30 μm or less, an aspect ratio Str of the surface texture is 0.93 or more, and an arithmetic mean curvature Spc of a peak is 4.8 (1 / μm) or less.

This application provides a stretchable device and its manufacturing method, relating to the field of display technology, to reduce the risk of fracture of the bending strain layer during stretching. The stretchable device includes: a stretching region and a non-stretching region; a substrate; at least one bending strain layer located on one side of the substrate, covering the stretching region and the non-stretching region in a direction perpendicular to the plane of the substrate; wherein, the surface of the bending strain layer away from the substrate is the upper surface, and the surface closer to the substrate is the lower surface; the portion of the bending strain layer located in the stretching region is the stretching portion, the stretching portion including at least one stretching part, at least a portion of each stretching part having an arc-shaped bending shape, in the portion of the stretching part having an arc-shaped bending shape, the upper surface and the lower surface are concentric arcs, and the central angle corresponding to the arc of the upper surface is the same as the central angle corresponding to the arc of the lower surface.

The application discloses a sensor device suitable for underwater platform structure health monitoring, which comprises a waterproof shell in a cylindrical barrel structure and without a bottom, a gland fixedly sleeved at the bottom of the waterproof shell, a sensitized rope and a fiber grating sensor; two self-pulling rods with through holes at the ends are arranged on the inner top surface of the waterproof shell at intervals, and a sensitized rope through hole and a fiber through hole are respectively arranged on the side walls of the waterproof shell at opposite positions; a base formed by three layers of circular plates is arranged on the inner bottom surface of the gland, the diameter of the circular plate in the middle layer is larger than that of the upper and lower layers, the thickness of the circular plate in the middle layer is smaller than that of the upper and lower layers, and the circular plate in the middle layer is a deformation bearing layer; two independent pulling rods with through holes at the ends are fixed on the circular plate of the top layer of the base at intervals; the two self-pulling rods, the two independent pulling rods, the sensitized rope through hole and the fiber through hole are on the same center line, and h is limited to be greater than x, and the application can satisfy long-term real-time monitoring of the expansion and bending strain of the underwater platform structure and achieve a sensitization effect.

The invention discloses a distributed fan group adaptive power regulation system based on artificial intelligence, relates to the technical field of power regulation, and is used for solving the problem that local high-fatigue nodes cannot be finished in time. Constructing torsional fatigue characteristics according to the main shaft torsion angle data, performing standardization processing on the blade bending strain data and the torsional fatigue characteristics, performing fusion to obtain a fatigue steady-state index, generating a fatigue state grade based on the fatigue steady-state index, marking fan nodes, and accessing a fan distribution database to determine neighborhood fan nodes of the marked nodes. The method comprises the following steps: acquiring the power generation margin of a neighborhood fan node and the current occupancy rate of an inverter, analyzing the compensation bearing characteristics of the neighborhood fan node according to the output state of the inverter and the power generation margin, judging whether the marked fan node has an alternate resting condition or not, reducing the local fatigue risk, and prolonging the overall operation life.

A torque structure includes a first body, a first strain gauge, a second strain gauge, and a second body unit. The first body is provided with a first receiving groove. The first strain gauge detects a bending strain of t he first body. The second strain gauge detects a torque deformation amount of the first body. The second body unit includes a second body, an indicator, a housing, and a power supply member. The second body is provided with a second receiving groove and a slot. The indicator is mounted in the slot and provided with a switch, a first push button, and a second push button. The indicator is electrically connected with the first strain gauge and the second strain gauge. The housing and the power supply member are received in the second receiving groove.

The application discloses a strain applying device and a bending radius determining method, and relates to the technical field of strain application. The device comprises a supporting piece, a first pushing piece, a second pushing piece, a driving assembly and a pressing assembly. The supporting piece is used for supporting a material. The first pushing piece and the second pushing piece are respectively located on the opposite sides of the supporting piece. The driving assembly is connected with the first pushing piece and the second pushing piece respectively. The driving assembly is used for driving the first pushing piece and the second pushing piece to move close to each other or move away from each other. The first pushing piece and the second pushing piece are used for making the material bend when moving close to each other. The pressing assembly is arranged above the supporting piece. The pressing assembly is used for applying pressure to the material at a preset height, so that the highest point of the material bending remains unchanged. Since the height of the material remains unchanged during the process of applying bending strain to the material, the microscope does not need to be refocused, the operation is simple, and the material can be prevented from directly contacting the objective lens of the microscope, so that the probability of damaging the objective lens is reduced.

This invention discloses a device and method for measuring the frictional torque of a high-pressure axial piston pump slipper, belonging to the technical field of axial piston pumps. The device uses a swashplate as the friction transmission component, connecting the back of the swashplate to an elastic sensitive element. Through strain gauges arranged on an elastic beam and a Wheatstone bridge circuit, the tangential bending strain signal caused by the slipper frictional torque is acquired. Combined with hydraulic loading, speed detection, and high-speed signal acquisition, synchronous measurement of friction signals under different operating conditions is achieved. During measurement, the system is first zeroed and statically calibrated in situ to obtain the calibration coefficient between the frictional torque and the output voltage. Then, the pump body is started and the load pressure is adjusted. The full-bridge output voltage, pressure, and speed signals are acquired, and the slipper frictional torque is calculated based on the calibration relationship. This invention enables direct, real-time measurement of frictional torque and effectively suppresses interference from axial loads and overturning moments, improving measurement accuracy and reliability.

This invention discloses a method for analyzing the tension characteristics of a wave-shaped riser, comprising: determining the structural parameters of the wave-shaped riser system and the marine environmental parameters; constructing a three-dimensional model of the wave-shaped riser system, discretizing the riser into multiple reduced beam elements using the absolute nodal coordinate method, obtaining the nodal coordinate vectors of the reduced beam elements, and deriving the mass matrix of the reduced beam elements; calculating the element strain energy corresponding to axial strain and bending strain, and obtaining the generalized elastic force of the elements; calculating the distributed load and concentrated force acting on the riser, and converting them into generalized external forces of the system, obtaining the generalized external force vector of the system; assembling the mass matrix, generalized external force vector, and nodal coordinate vector of each element to form the overall system dynamic equation; solving the system dynamic equation to obtain the absolute nodal coordinate vector of the riser at different times, and then calculating the tension along the entire length of the riser. This invention can accurately predict the tension distribution of the riser in complex marine environments.

The embodiment of the specification provides a kind of corrosion defect pipeline limit bending strain finite element calculation method and device, including constructing corrosion defect pipeline geometric model and finite element model;To finite element model to apply internal pressure load and bending load to carry out simulation operation;According to the limit bending strain of corrosion defect pipeline under burst failure according to burst failure criterion and simulation operation result, and according to the limit bending strain of corrosion defect pipeline under buckling failure according to buckling failure criterion and simulation operation result.This method is based on finite element simulation method, constructs the finite element model of corrosion defect pipeline under the action of internal pressure load and bending load, realizes the simulation of the bending deformation process of pipeline with different size corrosion defects, and the limit bending strain calculation result obtained is more accurate and efficient, it is convenient for on-site safety evaluation to corrosion defect pipeline, and it has reliable guiding significance for the routine operation and maintenance of pipeline in engineering.

The present disclosure relates to the technical field of flexible sensor and actuator, and proposes a strain adjustment system, method and application based on flexible sensor and actuator. The strain adjustment system based on flexible sensor and actuator comprises a flexible bending sensor, a flexible actuator and a processor, the flexible bending sensor and the flexible actuator are arranged on the surface of an object to be detected respectively; the bending of the surface of the object is detected by the flexible bending sensor; the processor controls the flexible actuator to generate corresponding bending strain according to the bending detection result. The present disclosure improves the performance of the flexible bending sensor and the flexible actuator by improving the preparation method of the flexible bending sensor and the flexible actuator, and combines the flexible bending sensor and the flexible actuator to form an integrated system, which can realize integrated operation from signal monitoring to feedback control.

A force detection bone screw device includes a bone screw body, a spring structure, a detection module, and an antenna module. The bone screw body includes a cylinder. The spring structure, the detection module and the antenna module are respectively arranged in the accommodation portion of the column. The spring structure includes a body, a bearing part, a fixing part and at least one bending strain structure. One end of the body is connected to the bearing part, and the other end of the body is connected to the fixing part, and the fixing part is fixed in the cylinder. Each bending strain structure is respectively provided on the body. The body has an axial direction, and each bending strain structure has deformation in at least one direction different from the axial direction. The detection module includes at least one strain element and a sensing component.

This invention discloses a low-interference differential device and method for micro-thrust measurement. The invention includes a measuring device and a measuring method. The measuring device includes a vibration isolation table; a thruster for generating a standard force; a long beam support fixed to the vibration isolation table; two cantilever beams of identical specifications fixed to the crossbeam support by clamps; strain gauges attached to the ends of the cantilever beams for measuring the bending strain of the beams; an impact hammer and an accelerometer fixed thereon; an embedded main control chip for acquiring data from the strain gauges and the accelerometer; and a host computer responsible for communicating with the main control chip and performing thrust calculations. The dual-beam differential measuring device designed in this invention has advantages such as improving the system's common-mode rejection ratio and reducing the impact of ambient temperature, vibration, and other common-mode noise on measurement stability.