Model construction method for arched beam spring deformation model based on force sense and tactile sense interaction

Abstract

The invention discloses a model construction method for arched beam spring deformation model based on force sense and tactile sense interaction. At first, a virtual scene is initialized. Then, position is detected. When a virtual proxy collides with surface of a virtual flexible body, internal local area where the virtual proxy and the virtual flexible body interact is filled in by the arched beam spring deformation model under the influence of the given virtual contact pressure, F. Then, local area deformation quantity of the virtual flexible body is calculated by the arched beam spring deformation model. Finally, graph is refreshed and force sense and tactile sense information is collected and output according to calculated virtual flexible body surface deformation quantity. The model construction method for arched beam spring deformation model based on force sense and tactile sense interaction, calculating at a high speed, has less amount of calculation, and can deform and simulate different flexible bodies through changing correspondent parameters in the model construction method which has a wide applicability.

Description

technical field [0001] The invention relates to a modeling method of a deformation model of force-tactile interaction, in particular to a modeling method of a deformation model of an arch beam spring based on force-tactile interaction in a virtual surgery simulation process. Background technique [0002] As one of the important applications of virtual reality technology in the medical field, virtual surgery has attracted more and more attention from academic and industrial circles at home and abroad since the 1980s and 1990s. Due to the high cost and high risk of real surgery, virtual surgery can effectively test the feasibility of the surgical plan through computer simulation of the surgical process, assist surgeons and apprentices to practice the actual operation process, and combine with advanced graphics technology can also Help patients communicate with surgeons. With the wave of China's aging population and the advent of the information age, the development of virtual...

AI Technical Summary

Problems solved by technology

[0004] Among the currently commonly used modeling methods for flexible body deformation models based on physical meaning, although finite element is accurate, it requires a large number of grid nodes, a large calculation time consumption, and poor real-time performance.

The construction of the spring-mass point network is simple and intuitive, and the calculation amount is small. However, due to the arbitrary setting of the spring coefficient, it is difficult to quantitatively identify the pros and cons of the behavior characteristics of the simulated object.

Boundary elements reduce the dimension of the problem and simplify the calculation by discretizing the model boundary, but there are certain difficulties in stability

In recent years, in order to improve the interactivity and real-time performance of virtual surgery simulation, many works using GPU-accelerated finite element calculations and nonlinear finite element calculations have also been carried out one after another. The former is based on linear description and small deformation, while the latter Although it can meet the real-time requirements of simulation, the simulation effect still needs to be improved.

The above shows that the modeling methods of these commonly used flexible body deformation models all have problems such as relatively complicated calculations and simulation effects that need to be improved.

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