Research on Simulation Accuracy of Particle Spring Body Model
The evaluation of the particle-spring body model simulation effect includes three aspects, tactile fidelity, visual fidelity and real-time. The tactile fidelity requires that the feedback force refresh frequency is not lower than 1000HZ. The improved Euler method has a short execution time and high computational efficiency. When the number of nodes is large, the deformation frame rate is also greater than 1000HZ, which satisfies the simulation requirements. Experimental results show that the improved Euler method has better real-time performance. Under the premise of ensuring the frame rate is greater than 1KHZ, the number of particles of the model can still be increased, and the simulation precision is improved.
The tetrahedral-based particle-spring body model is used to simulate the biomechanical characteristics of liver tissue, which has strong physical reality. At the same time, an improved Euler algorithm is proposed, which uses the explicit Euler method to solve the velocity and displacement of the particle. Then use the implicit Euler method to solve. The experimental data shows that this method has higher computational efficiency, better real-time performance, and is suitable for models with a large number of particles to ensure simulation accuracy. Therefore, the improved Euler algorithm can be applied to real-time simulation of tissue deformation in virtual surgery.
Conclusions on the surface contact points of the virtual surface of virtual surgical instruments on the vertex. At present, the research work on adjacent spacecraft at home and abroad is in the ascendant. For high-speed aircraft, the adjacent space environment is one of the important factors affecting its flight and safety. Attitude, reentry point, and plasma sheath characteristics are highly disturbed, and should be given high priority and comprehensive and quantitative evaluation. For the effect of adjacent space environment, system simulation analysis method can be used to replace part of flight test work. It is applied to the demonstration design, development test and meteorological support department of the adjacent space aircraft to achieve the purpose of shortening the cycle, saving money, and being safe and efficient. It is worthy of application and promotion in future engineering practice. In the future, based on the existing work, combined with the actual needs of the project, optimize the model, improve the algorithm, improve efficiency, and further improve the pertinence and reliability of the research results.
* Plate FLANGE (Plate Flange, Flat Flange, Plain Flange)
* SLIP ON FLANGE (SORF SOFF FLANGE)
* WELDING NECK FLANGE (WNRF FLANGE)
* BLANK FLANGE (BLIND FLANGE, BLFF FLANGE, BLRF FLANGE)
* THREADED FLANGE (SCREWED FLANGE)
*BACKING RING FLANGE
RTJ Flanges,ASME B16.5 Flanges,RTJ Sealing Flanges,RTJ Blind Flanges
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