This paper describes an innovative free-form modeling system, Virtual Clay Modeling System (VCMS), in which users can directly manipulate the shape of a virtual object like a clay model in real world. With this system, some disadvantages of interaction with computer aided industry design (CAID) systems can be resolved. In order to enhance the immersion feelings and improve the controlling abilities to cut, paste, and compensate of VCMS, we use Spaceball 5000 and PHANTOM Desktop to assign the set of interaction tasks. During the process of realizing 6 degree-of-freedom (DOF) haptic feedback modeling control, we developed and accomplished the device interfaces with Open Inventor and Qt application framework. VCMS provides us a good immersion of allowing for effective modeling in a virtual world.
According to the problems such as the absence of an accurate model of Camellia oleifera fresh fruit, inaccurate simulation process of decladding, and experience-based development of decladding equipment, the study combined the feature of shape structure and material characteristics of Camellia oleifera fruit, and is based on the bonded-particle model of discrete element method (DEM). The spherical equation was used to establish the contour of Camellia fresh fruit, and the crack line structure model of shell was generated in meta-particle method. The flexible model of seed was constructed by the particle accumulation method, and the particle coordinate control program was compiled to construct the flexible composite DEM model of Camellia oleifera fruit. The load-displacement curve of compression in the simulation test of Camellia oleifera fruit is basically consistent with that of the physical experiment, and the accuracy of the DEM model of Camellia oleifera fruit is verified. The research results provide theoretical guidance for revealing the mechanism of Camellia oleifera fresh fruit decladding and optimizing technical parameters of decladding equipment.
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