17results about How to "Control error" patented technology

The invention provides a finite element simulation method for a ribbed wallboard formed through laser shock. The finite element simulation method comprises the steps that initial laser shock pressure time-space distribution corresponding to laser process parameters is determined; applying the impact pit as a load to a laser multi-point continuous dynamic impact finite element model to obtain a simulated impact pit size; judging whether the size of the simulation and experiment impact pit is within an allowable error range or not; a strain field and a residual stress field after laser shock are obtained, and average inherent strain distribution in the depth direction is output; and introducing the average inherent strain distribution into the layered shell unit model of the ribbed wallboard and solving to obtain a deformation result of the ribbed wallboard impacted by the laser process parameters. Dynamic simulation of laser multi-point continuous impact is realized through display analysis, and deformation simulation of the ribbed wallboard formed through laser impact is realized through thermoelastic analysis, so that effective forming simulation can be performed on the complex ribbed wallboard, and the effects of low cost, high efficiency and accurate prediction result are achieved.

The embodiment of the present application provides a method, device and storage medium for intelligently generating an opening model of a beam-type component, and belongs to the field of industrial manufacturing technology. The method includes: obtaining model data of a part, the part is a beam-type component with a cross-section of a "J" shape, defining the top surface of the part as a product surface, the two sides of the part as profile surfaces, and the product surface and the profile surface are transitioned by a fillet surface; identifying the fillet surface in the model data, and determining the parting line of the fillet surface position according to the product surface and the profile surface on both sides of the fillet surface; generating a target profile surface according to the parting line and the profile surface, the target profile surface is a profile surface that is opened to a preset angle toward the outside of the part with the parting line as the rotation axis; based on the fillet surface, generating a target fillet surface connecting the product surface and the target profile surface, and obtaining the opening model data of the part composed of the product surface, the target profile surface and the target fillet surface. The present invention aims to improve the efficiency and accuracy of beam-type components in design and production.

The invention relates to the technical field of finite element simulation calculation, and provides a finite element model optimization calculation method for high-speed dynamic loading of a gradient composite material, which comprises the following steps of: establishing a two-dimensional axisymmetric structure model of a layered gradient configuration; carrying out material characteristic description on the two-dimensional axisymmetric structure model to obtain material parameters, and carrying out segmented description on the impact heat insulation line to obtain a segmented mathematical relationship; correcting the shock wave velocity and the particle velocity based on the shear modulus and the yield strength to obtain a corrected shock wave velocity and a corrected particle velocity; fitting is conducted through the segmented mathematical relationship, the corrected shock wave speed and the corrected particle speed, the corrected segmented mathematical relationship of the corrected shock wave speed and the corrected particle speed is obtained, and based on material parameters and the corrected segmented mathematical relationship, a large amount of sample data is generated through a Latin hypercube sampling method and a center composite design sampling method; evaluating data points of the sample data through a multi-target genetic algorithm to obtain optimized sample data; and performing modeling based on the optimized sample data to obtain an initial optimal finite element model, and performing repeated verification on the initial optimal finite element model to obtain an optimal finite element model. According to the method, automation of the modeling process is achieved, the final particle speed is increased, meanwhile, the calculation time cost is reduced, and the accuracy and calculation efficiency of the model are improved.

The utility model belongs to the technical field of aircraft assembly, and particularly relates to a marking and drilling tool used for drilling hanging holes in an upper wall plate of an aircraft wing, which comprises a drill plate, a drill bushing and a marking tool, the marking tool comprises a Z-shaped clamping part and an I-shaped marking part arranged on the upper surface of the Z-shaped clamping part, a gap is formed between the Z-shaped clamping part and the I-shaped marking part, the front edge of the wing upper wall plate is clamped in the gap, the edge of a corner box on the lower portion of the wing upper wall plate is clamped on the inner side of the Z-shaped clamping part, and the drill plate and the drill sleeve are arranged on the upper surface of the marking tool. In the hanging hole drilling process, the working efficiency is effectively improved, the multi-error repeated lineation process is replaced, and efficient hole drilling is achieved.

The present invention discloses a method for controlling an air-sea heterogeneous unmanned cluster collaborative formation under complex confrontation conditions. The method comprises the following steps: constructing a kinematic model of an air-sea heterogeneous unmanned cluster, setting a virtual navigator, and constructing a leader-follower model; constructing a communication interference model of an air-sea heterogeneous unmanned cluster; establishing an adaptive fault observer, and then establishing a control law for an air-sea heterogeneous unmanned cluster collaborative formation, and controlling the air-sea heterogeneous unmanned cluster collaborative formation under complex confrontation conditions according to the communication interference model of the air-sea heterogeneous unmanned cluster and the control law for the air-sea heterogeneous unmanned cluster collaborative formation. The present invention simultaneously considers the impact of countering network attacks on communications, as well as the impact of actuator failures in air-sea heterogeneous unmanned cluster formation members on formation control, thereby realizing the control of an air-sea heterogeneous unmanned cluster collaborative formation under complex confrontation conditions.

The invention belongs to the field of computer application, and discloses an error-limited Hilbert tree learning index construction method on a directed road network, which comprises the following steps of: projecting a space-time sample into a position-time grid, sorting cells of the grid based on a Hilbert curve, dividing the sorted sample into logic blocks, storing the logic blocks into a disk, and constructing a Hilbert tree learning index. Meanwhile, a binary tree for dividing nodes according to Hilbert curve serial numbers is established, the mapping relation between the Hilbert serial numbers and logic blocks is represented, and it is guaranteed that the mapping error of leaf nodes is smaller than a specified error. According to the method, the two-dimensional space is divided according to the Hilbert curve, uniform distribution of trajectory data in the position-time grid is ensured, and full recall of query data is ensured through error bounded, so that query performance on tilt data is improved.

The invention relates to the technical field of elevator traction system control, and discloses an elevator traction system braking force monitoring method and system and a terminal. The braking force monitoring method comprises the following steps that elevator digital twin bodies are constructed; a control program is configured, the elevator digital twinning body is controlled to move, and the movement of the elevator digital twinning body is kept consistent with the movement of the elevator physical entity; configuring an elevator car ascending braking force monitoring model and an elevator car descending braking force monitoring model, wherein the elevator car ascending braking force monitoring model and the elevator car descending braking force monitoring model are both braking force monitoring models for introducing compensation of a steel wire rope, a compensation chain, a traveling cable and a traction wheel; when the elevator car ascends, operating the elevator car ascending braking force monitoring model to obtain an ascending braking force monitoring result; and when the elevator car descends, the elevator car descending braking force monitoring model is operated to obtain a descending braking force monitoring result. According to the invention, the braking performance of the traction system can be monitored more accurately and conveniently.

This invention discloses a three-dimensional assembly method for ultra-large span double-layer steel truss bridges, including: setting two rows of steel piers according to the camber of the jig and preventing settlement; using a gantry crane with special clamps to achieve the horizontal and vertical conversion of the truss segments; assembling the first segment in the order of lower bridge deck, side trusses, and upper bridge deck; subsequently, matching and welding the mother segments in the same order; pre-setting vertical anti-deformation during assembly, and welding from the middle section to both sides; uniformly installing anchor pipes after the completion of the large segment assembly in a single round; setting three quality control points during assembly to check the total length, side curvature, truss width, diagonal difference, camber, and anchor point spacing; after passing the test, disassembling and removing the jig, retaining the mother segment for the next round. This application controls welding deformation and cumulative alignment error through multi-segment continuous matching assembly and anti-deformation pre-setting; the subsequent installation of anchor pipes avoids collisions and ensures anchor point accuracy; setting the jig according to the camber and re-measuring in rounds achieves a reliable transition from stress-free to stress-loaded installation.

The application discloses a miniaturized VOCs gas sensor and early warning system based on temperature and humidity compensation and relates to the technical field of gas sensors.The miniaturized VOCs gas sensor and early warning system based on temperature and humidity compensation comprises a microfluidic chip base body, a microfluid channel arranged in the microfluidic chip base body, the microfluid channel having an air inlet and an air outlet, and a micro-nano composite sensitive array integrated in the microfluid channel.The miniaturized VOCs gas sensor and early warning system based on temperature and humidity compensation changes the temperature and humidity compensation from traditional signal post-processing to active environment decoupling before response, controls the error absolute value of gas concentration detection within a set temperature range in degrees Celsius and a relative humidity range, and compensates for the response without additional delay.The feature extraction and early warning level determination are completed by a pulse neural network in an event-driven manner without the need of uploading data to an upper computer for processing, so that independent decision-making and instant response of the sensing end are realized.

The application provides a soil dry-wet cycle device with hydrodynamic pressure regulation function and a test method, wherein the soil dry-wet cycle device comprises a test table, a support, a water pump, a water storage tank and an automatic dry-wet cycle mechanism, the automatic dry-wet cycle mechanism comprises a sealing top cover, a dry-wet cycle chamber, a dryer, a soil sample mounting unit and a controller, the soil sample mounting unit comprises a fixing structure, a microporous diaphragm bottom plate, a soil ring knife positioning sleeve frame and a microporous diaphragm top plate, the microporous diaphragm top plate and the microporous diaphragm bottom plate both have water-permeable and air-permeable structures, a first electromagnetic valve is installed on a water inlet pipe, a second electromagnetic valve is installed on a lower drain pipe, dryers are fixedly arranged at air inlets, and the controller is connected with the water pump, the dryers, the first electromagnetic valve and the second electromagnetic valve; and the application further provides a test method. The application can realize automatic quantitative research on the influence of dry-wet cycles on soil characteristics under different conditions in large quantities, and can also research the influence of different ions on soil characteristics in dry-wet cycles.

The invention particularly relates to a B spline curve offset-selfing elimination method based on Legendre polynomial expansion. The method comprises the following steps of: obtaining a Legendre coefficient auxiliary matrix on the basis of a Legendre polynomial value and a Gauss-Legendre quadrature node weight; the method comprises the following steps: mapping a Gauss-Legendre quadrature node to a non-zero length node interval to obtain a corresponding normal direction; acquiring a corresponding offset point according to the normal direction and the specified distance; based on the Legendre coefficient auxiliary matrix and the offset point, obtaining a Legendre coefficient; compared with a Taylor expansion method, the Legendre orthogonal basis expansion method has the advantages that the approximation convergence rate is better; and the error can be further controlled through calculation of the truncation error of the Legendre coefficient and subsequent judgment and processing. The Legendre coefficient auxiliary matrix and the Legendre-Bezier transformation matrix are pre-calculated static data, so that global repeated calling for multiple times can be realized, and the approximation efficiency is improved. And when the tangent intersection detection triggered by the adjoint matrix eigenvalue method fails, returning is executed, and real intersection and tangent intersection are distinguished based on a GCD decomposition method, so that the selfing detection efficiency is further improved.

The utility model discloses a concrete aggregate automatic metering and batching device, and belongs to the technical field of concrete production, the concrete aggregate automatic metering and batching device comprises a rack, a conveying belt is rotatably connected in the rack, fixing frames are arranged on the two sides of the rack, a transverse frame is arranged between the two fixing frames, and a plurality of aggregate storage hoppers are arranged in the transverse frame; a gate weighing mechanism is arranged at the bottom of the aggregate storage hopper and comprises a fixing plate, the fixing plate is located on one side of the aggregate storage hopper, a gate is rotationally connected to the middle of the fixing plate, a weighing module is arranged above the gate, and the gate abuts against the bottom of the aggregate storage hopper; when the device is used, the aggregate batching error can be effectively controlled, and the concrete strength consistency can be remarkably improved; the production efficiency is further improved, meanwhile, the automation level can be improved, and manual intervention is effectively reduced; the system is low in use cost and suitable for small and medium-sized mixing stations.

The invention discloses a testing device for a grey water scale inhibition dispersant, and relates to the technical field of testing, the testing device comprises: a pretreatment assembly, which is composed of a blending tank, a metering pump set and a flushing tank, the lower end of the blending tank is provided with an external interface, and the blending tank and the flushing tank are both connected with the metering pump set; the liquid storage tank group is composed of a cation solution tank, an anion solution tank, an acid washing solution tank and an alkali washing solution tank, and the output end of each solution tank is connected to the external connector through a transmission pipe; the number of the solution spiral preheating assemblies is two; the spiral test tube is dried through the heater on the spiral test assembly, numerical values are directly read through the measuring assembly, follow-up calculation is carried out, the whole process is simple and convenient, manual operation steps are few, errors can be controlled easily, and meanwhile the test efficiency is improved.

The application discloses a cantilever type instrument operation parameter optimization trajectory planning method for a multi-constraint field coupling in a limited space, and relates to the technical field of dental robots. In the tooth preparation process, the instrument is prone to collision with the tooth and oral tissue in the limited space in the oral cavity, and the end force deformation affects the machining precision. The technical points are as follows: the residual volume of the interaction between the bur and the tooth is calculated, and an end force deformation model based on grinding force, friction force and extrusion force is established; a penalty function containing the collision between the bur and the tooth, the collision between the handle of the dental handpiece and the mouth and the tooth is constructed, and the space collision detection is carried out through the enclosing ellipsoid method; in combination with the continuity requirement of the joint angle, an optimization function taking the material residual volume, the comprehensive deviation of the end deformation and the motion smoothness as targets is established, and a multi-objective optimization algorithm is adopted to solve the optimal instrument pose and joint parameters; and the operation parameters of the cantilever type instrument under multiple constraints are optimized under the premise of ensuring the preparation accuracy and safety.

This invention relates to the field of water conservancy engineering technology, specifically to a method for monitoring suspended sediment in the Yellow River Estuary and its adjacent sea areas based on multi-source remote sensing data. The method includes the following steps: selecting complementary multi-source remote sensing data (Landsat 8 OLI, Sentinel-2A / B, GF-1 WFV, GOCI), and performing radiometric calibration, atmospheric correction, and geometric fine correction standardization preprocessing; using an algorithm combining weighted average and principal component analysis to fuse the multi-source data and extract sediment-sensitive characteristic information; constructing an improved semi-empirical radiative transfer model incorporating tidal current, wind speed, and hydrodynamic correction factors to invert suspended sediment concentration, and ensuring the reliability of the results through multi-dimensional verification. This invention significantly improves monitoring accuracy and spatiotemporal coverage, and is adaptable to routine, emergency, and long-term dynamic monitoring of the Yellow River Estuary, providing scientific support for estuary ecological protection and management decisions.

The utility model discloses a pipeline elbow angle measuring tool, which comprises a fixed platform and an angle measuring assembly, a supporting part is vertically arranged on the fixed platform, the angle measuring assembly is positioned above the fixed platform, and the angle measuring assembly comprises a fixed part, a movable part and a measuring part, the fixed part is connected with the supporting part, the two opposite ends of the movable part are rotationally connected with the fixed part and the measuring part respectively, and a protractor and a gradienter are arranged on the measuring part. According to the pipeline elbow angle measuring tool, elbow inspection efficiency and accuracy can be improved, deformation and errors in the elbow welding process can be effectively controlled, production efficiency and product quality are improved, and meanwhile working efficiency is improved.

The invention discloses an external clamping type liquid ultrasonic flowmeter integrated with a scanning imaging detection technology, and relates to the technical field of liquid flow measurement and pipeline safety detection, the external clamping type liquid ultrasonic flowmeter comprises an external clamping type sensing main body and a detection system, and the external clamping type sensing main body is of a detachable clamping structure; the detection system comprises an ultrasonic transmitting and receiving module, a scanning imaging module, a signal processing module, a data storage and analysis module and a wall thickness compensation module. The ultrasonic transmitting and receiving module is used for controlling an ultrasonic transducer array integrated in the outer clamping type sensing main body to periodically transmit ultrasonic signals, synchronously receiving ultrasonic echo signals reflected and transmitted by a pipeline wall and a liquid medium, and sending the ultrasonic echo signals to the scanning imaging module; the ultrasonic flow measurement and the pipeline scanning imaging detection technology are fused, integration of flow measurement and corrosion detection can be achieved, function integration is further achieved, multiple devices do not need to be used independently, the detection cost is reduced, and the detection efficiency is improved.