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Real-time cutting simulation method of flexible object on the basis of finite element and time-variant modal analysis

A flexible object, time-varying modal technology, applied in the field of physical simulation, can solve problems such as inability to adapt and update grid update operations, low real-time computing efficiency of large-scale grids, etc., and achieve the effect of avoiding excessive errors

Active Publication Date: 2016-02-03
BEIHANG UNIV
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the disadvantages of existing methods, such as the low efficiency of real-time calculation of large-scale grids, and the inability to perform dynamic self-adaptive adjustment and update on the grid update operations that occur during the simulation process, and provide a method based on limited The real-time cutting simulation method of flexible objects based on element and time-varying modal analysis, and uses the computing power of GPU hardware to improve the efficiency of calculation and drawing. This method mainly uses the finite element method to model the simulation domain, and at the same time, the Perform subspace dynamic construction based on prior modal analysis

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  • Real-time cutting simulation method of flexible object on the basis of finite element and time-variant modal analysis
  • Real-time cutting simulation method of flexible object on the basis of finite element and time-variant modal analysis
  • Real-time cutting simulation method of flexible object on the basis of finite element and time-variant modal analysis

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[0046] figure 1 The overall processing flow of the real-time cutting simulation process of flexible objects based on finite element and time-varying modal analysis is given, and the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0047] The present invention provides a real-time cutting simulation method for flexible objects based on finite element and time-varying modal analysis. The main steps are as follows:

[0048] Step (1) According to the input OBJ model (see figure 2 (a)) and the model boundary equation to establish the model boundary voting function (voting function, v(x, y, z)). The voting function takes spatial point coordinates as input parameters, and returns true when the spatial coordinates are included in the model simulation domain represented, otherwise returns false. Establish the overall AABB bounding box of the model as the root node of the hexahedral mesh based on the Octree. If th...

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Abstract

The invention relates to a real-time cutting simulation method of a flexible object on the basis of finite element and time-variant modal analysis. The real-time cutting simulation method carries out researches and is implemented mainly by aiming at a real-time interactive soft tissue deformation and cutting simulation algorithm of a virtual surgery. The method comprises the following steps: carrying out voxelization and finite element physical modeling on a simulation domain of a model, carrying out subspace construction on the basis of priori modal analysis, carrying out cutting operation response, carrying out significance analysis and screening on a subspace base vector, and carrying out subspace time-variant effectiveness estimation. The method carries out parallel design on the simulation algorithm and achieves real-time interactive efficiency by virtue of the powerful calculation capability of GPU (Graphics Processing Unit).

Description

technical field [0001] The invention belongs to the technical field of physical simulation, in particular to a real-time cutting simulation method for flexible objects based on finite element and time-varying modal analysis. Background technique [0002] In the field of computer graphics, the deformation model was first introduced by Terzopolous et al. With the continuous development of computer graphics technology, especially in the last decade, due to the increasingly prominent role of biomechanical simulation in surgical planning and decision-making assistance in modern medicine, high-fidelity and high-efficiency physical deformation / cutting simulation has been favored. received more and more attention. [0003] The finite element method has become a powerful tool for modeling the physics involved in deformation and arbitrary cutting operations of elastic objects, as well as elastic mechanics. Dick et al. proposed a computational framework utilizing a geometric multigri...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 王莉莉杨晨李帅郝爱民秦洪
Owner BEIHANG UNIV
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