33 results about "Geometric simulation" patented technology

The invention discloses a VBO-based efficient geometric simulation method for a cutting process. The method comprises the following steps: performing local Boolean operation on a tool / workpiece, establishing a model bounding box, determining a local intersection position, and performing rapid Boolean operation; virtual voxel mapping: mapping end points of the workpiece Tri-dexel model to corresponding virtual voxels in a space; virtual voxel information coding: coding the surface patch data of the workpiece model by taking a virtual voxel as a unit; voxel data management: mapping a storage mode of voxel data in a video memory VBO to a system memory; VBO data updating: performing local efficient updating on the model patch data stored in the video memory VBO; and performing visual rendering, manually defining a rendering pipeline, decoding the model patch data in the video memory VBO, and drawing the decoded model patch data on a screen. According to the method, redundant calculation in the simulation process can be reduced, local dynamic updating of the workpiece model is achieved, and the efficiency of geometric simulation in the cutting machining process is greatly improved.

The invention discloses a method for generating a fabric simulation model on the basis of geometrical measurement, which comprises the following steps of: selecting a common garment fabric sample; carrying out material measurement of geometric attributes on the basis a fabric; carrying out geometric constraint deformation simulation on the basis of the fabric; carrying out geometric simulation verification on the basis of the fabric. The embodiment of the invention is implemented; the method obtains corresponding characteristic parameters which express the overhang characteristic of the fabric by directly measuring the real fabric sample, is directly applied to geometric simulation of the fabric and overcomes the defects of complex system and high cost on the basis of the physical KES-FB (Kawabata Evaluation System Fabric) and the like.

A numerical control machining optimization system and method based on physical simulation is provided. The system comprises an input module, a code parsing and geometric simulation module, a physicalsimulation module, an optimization module and an output module that are successively connected, and a cutting force model database module connected to the physical simulation module. The input moduletransmits a read numerical control path file and physical information to the code parsing and geometric simulation module. The code parsing and geometric simulation module transfers specific parameterinformation of a full process cycle determined through parsing and simulation to the physical simulation module. The physical simulation module calculates a cutting force according to the parameter information by combining with a cutting force coefficient in the cutting force coefficient model database module, and transmits the cutting force to the optimization module. The optimization module generates a new machining code through an optimization process, and transmits the new machining code to the output module. The output module converts the new machining code into a numerical control codethat can be directly read by a machine tool, and outputs the numerical control code. According to the numerical control machining optimization system and method based on physical simulation, machiningefficiency is improved, and tool abrasion is reduced.

A high-adaptability multi-phase particle dispersion type fuel element temperature field calculation method mainly comprises the following steps of: 1, establishing and setting a geometric simulation model of a fuel element and multi-phase dispersion particles; 2, importing control flow engineering software into the set geometric simulation model; 3, calculating an element temperature field at the current moment; 4, dividing to obtain element sub-regions; 5, calculating and storing the average temperature of the sub-regions; 6, using numerical simulation software to modify representative particle parameters and calculate a temperature field; 7, storing the heat conductivity of the particles and the base material of each sub-region; 8, calculating equivalent thermal conductivity of an element fuel area by using the theoretical model; 9, correcting the heat conduction parameters of the element; and 10, repeating the steps 3-9 until the end of the moment. According to the high-adaptability calculation method, the relation between the temperature field of the element and the temperature field of the dispersion particle can be established, real-time parameter mutual transmission is achieved, data of the heat conduction performance of the element is updated, and therefore the fuel element temperature field can be evaluated more effectively and accurately.

The invention relates to a shrink ratio test stand for testing the performance of a brake material for a railway train. The analysis on the performance of the brake material is the important technical problem of research on all friction materials. The current standard regulates that the performance detection of all the brake materials for the railway and the railway trains can be tested on a 1:1 bench. Currently, few 1:1 railway train inertia braking benches are provided in China, so that the normal product detection is difficult to carry out. In the invention, a novel test bench for testing the performance of the brake material for the railway train, which consists of a driving mechanism, an inertia wheel configuration mechanism and the like, is arranged; a brake engineering principle isclosely combined; and a small sample geometric simulation shrink ratio test mode is used to be consistent with a 1:1 bench test mode. Due to the adoption of the shrink ratio test stand, a result corresponding to test data of the 1:1 bench can be obtained; and the consistency of the testing condition and the using working condition of the shrink ratio test stand in the whole testing process is really reflected. The shrink ratio test stand is convenient to operate and has complete functions and high technology content. The gap of the industry in China is filled. The rapid development of the field of the brake material in the industry is promoted.

The invention discloses a layout method for the temperature and humidity sensor of the environment automatic regulation system of a substation distribution room, comprising the following steps of: using Ansys to establish a three-dimensional geometric simulation model of the substation power distribution room; using the Ansys to perform temperature field and humidity field simulation analysis of distribution room on the simulation model; acquiring temperature field and humidity field distribution simulation graphs at different heights; and performing the layout of the temperature and humiditysensor according to the simulation graphs. The layout method for the temperature and humidity sensor of the environment automatic regulation system of a substation distribution room solves the technical problem in the prior art that, the sensor arrangement for monitoring the temperature and humidity environment of the substation distribution room depends on manual experience or installation convenience, and the data acquired by the arranged sensor is not representative for describing the environment parameters of the distribution room, so that the temperature and humidity condition of the substation distribution room cannot be comprehensively monitored and understood, and the effective control cannot be performed to regulate the environment parameters of the distribution room.

The invention provides a detection method and device for a temperature rise fault of a train electric appliance cabinet and a terminal device, and the method comprises the steps of obtaining the thermal parameter variable values of at least one type of devices in the train electric appliance cabinet, and carrying out simulation parameterization of the thermal parameter variable values of the devices, and obtaining the simulation parameters; establishing a geometric simulation model of the train electric appliance cabinet and the at least one type of devices; according to the simulation parameters and the geometric simulation model, obtaining a train electric appliance cabinet multi-physics field coupling simulation model; extracting a temperature threshold value of the at least one type of devices of the train electric appliance cabinet multi-physics field coupling simulation model under different working conditions; obtaining the real-time temperature of the at least one type of devices through the thermal imaging principle, and when the real-time temperature is larger than the temperature threshold value of the corresponding device, carrying out fault alarming on the corresponding device. According to the invention, a complex monitoring module is not needed for circuit detection, and the overall temperature field of the train electric appliance cabinet is obtained by using the thermal imaging principle, so that the working state of the train electric appliance cabinet is more visually displayed, and the occurrence of judgment errors is further reduced.

The invention discloses a VBO-based high-efficiency geometric simulation method of the cutting process, which comprises the following steps: local Boolean operation of the tool / workpiece, establishment of a model bounding box, determination of local intersection positions, and fast Boolean operation; virtual voxel mapping, the workpiece The endpoints of the Tri-dexel model are mapped to the corresponding virtual voxels in the space; virtual voxel information encoding, encoding the patch data of the workpiece model in units of virtual voxels; voxel data management, storing voxel data in the video memory VBO The storage method in the memory is mapped to the system memory; the VBO data update, the model patch data stored in the video memory VBO is locally and efficiently updated; the visual rendering, the rendering pipeline is manually defined, and the model patch data in the video memory VBO is decoded and drawn to the screen. This method can reduce redundant calculation in the simulation process, realize local dynamic updating of the workpiece model, and greatly improve the efficiency of geometric simulation in the cutting process.

The invention relates to an STL-model-based material removal algorithm in numeral control machining geometric simulation, comprising the following steps: transforming a CAD-generated processed workpiece and a tool swept volume into the STL format; accessing the STL models of the tool swept volume and the processed workpiece; establishing the relationship index for the triangular patches of the tool swept volume and the processed workpiece surface; establishing the smallest-possible enclosing boxes for the workpiece and the tool swept volume; screening and removing the non-intersecting triangular patches; using the dot product and the cross product of vector to create a vector determining model; determining whether the triangular patches intersect to obtain a set of intersecting triangular patch pairs; solving the intersecting lines of the intersecting triangular patch pairs; solving the intersecting line ring; reconstructing the triangular patches involved in the intersecting of the processed workpiece and the tool swept volume; classifying the triangular patches; and with the kept surface of the processed workpiece and the surface involving in the processing of the tool swept volume form a new enclosed surface to develop a workpiece model after the materials are removed.

The invention discloses a geometric simulation method in the virtual laser flexible processing course. The method comprises the establishment of a virtual processing platform, the trajectory planningbased on CAD data, the trajectory optimization, the triangular simplification algorithm based on processing head effect, and a collision detection model. The invention can help observe the processingmovement course in the computer visualization environment, visually display the collision interference and unreasonable processing trajectory in processing robots and other equipment as well as workpieces by laser, and forecast the processing defects in an early stage, so as to provide an effect basis for process parameter adjustment and process optimization, so as to save manpower, material resources, time and cost.

The invention discloses a distribution room environment adjusting system adjusting method based on sensor optimization arrangement. The adjusting method comprises a sensor optimization arrangement method and an adjusting system adjusting method; the sensor optimization arrangement method comprises the following steps of establishing a three-dimensional geometric simulation model of a transformer substation distribution room by utilizing Ansys, performing distribution room temperature field and humidity field simulation analysis on the simulation model by means of Ansys, obtaining temperature field and humidity field distribution simulation graphs at different heights, and selecting temperature and humidity sensors for distribution through the simulation graphs. The problem of accidents caused by that the indoor temperature and humidity monitoring points are small in distribution and unreasonable in distribution is solved; and 2, on the aspect of a control strategy, once it is monitoredthat the environment has certain unqualified point, all equipment are started, and the whole environment can be adjusted together; and consequently, the method is not accurate enough, while unnecessary equipment is started, so that the working time of equipment is prolonged, the energy consumption is increased, and the purposes of energy conservation and emission reduction cannot be achieved.

The invention discloses a method for simulating the internal fluid flow of a porous medium solid-phase converter. A geometric simulation area of ​​a porous medium is established by sintering a solid-phase converter sample made of glass beads; Slice image sequences are processed and three-dimensionally reconstructed, the 3D reconstruction model of the porous medium solid-phase converter is meshed, the fluid flow inside the porous medium converter is studied, and the solid-phase skeleton and fluid in the porous medium are analyzed based on the electric double layer theory The potential distribution of the contact surface and its neighborhood; the image processing method of 3D volume pixels is adopted, and the continuity of the solid-phase converter in porous media is considered in different directions, which improves the accuracy of the 3D reconstructed geometric model, thereby improving the simulation accuracy of the fluid distribution At the same time, it has the advantages of fast modeling, good convergence, and high portability, which can speed up the modeling of the signal conversion process involved in the fluid flow inside the porous medium solid-phase converter, and help to improve the overall performance of the liquid ring angular accelerometer.