8 results about "Fully coupled" patented technology

The invention discloses a complete machine variable-dimension simulation method based on a circumferential average flow model, belongs to the technical field of aero-engine numerical simulation and multi-scale modeling, and solves the problem that complete machine simulation efficiency and local flow detail precision are difficult to consider at the same time in the prior art. And traditional full-three-dimensional computing is too high in resource consumption and cannot quickly evaluate the performance of the whole machine. According to the method, a zero-dimensional complete machine and component two-dimensional model of the aero-engine is firstly established, dimensionality reduction is carried out by using a circumferential average N-S equation, the two-dimensional model is embedded into the zero-dimensional model, an equivalent replacement variable reconstruction equation set is solved, synchronous convergence of the complete machine and component models is realized, and simulation precision and efficiency are improved. According to the method, a full coupling mode is adopted, two-dimensional dimension reduction modeling is combined, minute-level convergence is achieved, the simulation error is not larger than 5%, the simulation precision is improved, the calculation efficiency is improved, rich S2 flow field information can be provided, and the research and development cost and period are reduced.

The invention discloses an LS-DYNA-based electromagnetic energy propulsion equipment simulation method considering an initial pre-tightening force, and the method comprises the steps: firstly carrying out the high-precision modeling of an armature and a track complex curved surface through a True Grid platform, and solving the problem of boundary effect distortion caused by simplified modeling in a conventional method; and secondly, by calculating the initial pre-tightening force, the initial pre-tightening force is loaded in the simulation model, so that the simulation accuracy is improved. Besides, the method constructs an enhanced simulation model containing contact pressure and an electromagnetic field diffusion mechanism based on an LS-DYNA solver architecture, and realizes high-precision simulation of the emission dynamic characteristics of the electromagnetic energy propulsion equipment system under the extreme working condition by establishing a transient electromagnetic force-heat-structure full coupling solving system of a track-armature interface. According to the method, the space-time evolution of the motion state, the current density and the contact pressure of the contact surface of the equipment in the whole process is reflected more practically, and an effective simulation means is provided for design, optimization, test and evaluation of the electromagnetic energy propulsion equipment.

The present invention belongs to the technical field of parallel mechanisms and provides a six-degree-of-freedom fully decoupled serial-parallel mechanism containing closed-loop units, including a 2R parallel mechanism and a 3T1R parallel mechanism. The 2R parallel mechanism includes a first moving platform, a first fixed platform, and a first mechanism branch disposed between the first moving platform and the first fixed platform. The 3T1R parallel mechanism includes a second moving platform, a second fixed platform, and a second mechanism branch disposed between the second moving platform and the second fixed platform, wherein the first fixed platform is connected to the second moving platform via the second mechanism branch. Based on screw theory, the present invention adopts a method of constructing closed-loop units by decoupling sub-mechanisms. The overall parallel mechanism is split into multiple sub-parallel mechanisms for design based on the motion characteristics of the degrees of freedom. The branches contain closed-loop units to achieve independent output of force and torque in the X, Y, and Z directions of the moving platform. The present invention also provides a method for constructing a six-degree-of-freedom fully coupled parallel mechanism, simplifying the method and process for designing a fully coupled parallel mechanism.

The application relates to a full-coupling MEMS tuning fork gyroscope, comprising: an anchor point structure, a suspension structure being suspended on the anchor point structure; wherein the suspension structure comprises two symmetrically arranged suspension units, each suspension unit comprising a driving mass, a Coriolis mass and a sensitive mass, the two sensitive masses being connected through a sensitive coupling structure between opposite surfaces of the two sensitive masses, and the free ends of the two driving masses being connected through a driving coupling structure. The MEMS tuning fork gyroscope designed by the application adopts a full-coupling structure, so that the response amplitudes of the driving mode and the sensitive mode of the gyroscope are closer, the frequency difference between the two modes is effectively reduced, and the sensitivity of the gyroscope is effectively enhanced.

This application provides a fully coupled electromagnetic-thermal-mechanical simulation design method and system for SiC controllers, belonging to the field of power electronic device simulation design technology. The method involves: constructing a two-way real-time coupled model of electromagnetic, thermal, and mechanical stress fields; determining the irradiation dose based on the expected operating environment of the SiC controller, introducing an irradiation damage factor to correct the SiC material parameters, and inputting this into the two-way real-time coupled model; performing multi-condition simulations by inputting different temperature and stress conditions into the two-way real-time coupled model, outputting the performance parameters of the SiC material, and establishing a quantitative relationship model between the performance parameters and temperature and stress to reveal the performance degradation law of the SiC material; and, based on the two-way real-time coupled model and the performance degradation law of the SiC material, synergistically optimizing the parameters of the SiC controller with switching losses and temperature rise as optimization targets. This application improves simulation accuracy, optimizes SiC controller performance, and enhances reliability and service life.

The invention provides a model-based design method for a digital prototype of an electric power system of an unmanned underwater vehicle, which comprises the following steps of: analyzing design requirements of the system, and designing and constructing a prototype design requirement model; carrying out functional model research on the basis of the design requirement model, and designing and constructing a prototype functional model; based on the prototype function model, carrying out structure design and simulation optimization work of a physical implementation layer, and designing and constructing a prototype performance model; fully coupling the system-level indexes with each group of component sub-models contained in the prototype performance model, and constructing a three-dimensional fused digital prototype model; performing product geometric design on each group of components in the digital prototype model, and constructing a prototype product geometric model; producing and manufacturing each group of components in the geometric model of the prototype product to obtain a physical prototype, and performing integrated joint debugging on the physical prototype; fusing the digital prototype model and the physical prototype; according to the method, the overall collaborative design efficiency of the system is improved, and the design period is shortened.

The invention relates to the technical field of offshore oil pipeline laying simulation experiments, in particular to a full coupling effect testing device for S-shaped laying of pipelines, and aims to solve the problems that an existing experimental device is poor in real-time performance and cannot effectively simulate full coupling response of a pipe laying ship-stinger-pipeline-soil body system in S-shaped laying of the pipelines. The device comprises a control mechanism, an adjusting mechanism and a monitoring assembly. The control mechanism is fixedly connected with one end of the pipeline and can control the displacement direction of the pipeline, and the other end of the pipeline is hinged to the upper portion of the soil box model. The soil box model is arranged at the bottom of the test pool; the adjusting mechanism abuts against the side wall of the pipeline and can adjust the angle between the pipeline and the horizontal plane. The monitoring assembly can collect parameters of the pipeline in real time. The ocean ground is simulated through the soil box model, the control mechanism simulates the pipe laying ship, the adjusting mechanism changes the S line shape of the pipeline and the angle between the pipeline and the horizontal plane by adjusting the heights of different parts of the pipeline, and then various parameters of the pipeline can be collected in real time through the monitoring assembly.