With growing economic and social development, carbon emissions caused by energy consumption surge, leading to an exacerbated greenhouse effect, rising average temperatures,melting glaciers, and an unstable global clim...With growing economic and social development, carbon emissions caused by energy consumption surge, leading to an exacerbated greenhouse effect, rising average temperatures,melting glaciers, and an unstable global climate,which may all result in more destructive natural disasters.展开更多
According to the features of the turning simulation, a simplified Whitted lighti ng model is proposed based on the analysis of Phong and other local illumination model. Moreover, in order to obtain the natural lightin...According to the features of the turning simulation, a simplified Whitted lighti ng model is proposed based on the analysis of Phong and other local illumination model. Moreover, in order to obtain the natural lighting effects, local ray tra cing algorithm is given to calculate the light intensity of every position durin g the course of the simulation. This method can calculate the refresh area befor e calculating the intersection line, simulate the machining environment accurate ly and reduce the calculating time. Finally, an example of the virtual cutting s cene is shown to demonstrate the effects of the global illumination model. If th e CUP is 1.3 G and the internal memory is 128 M, the refreshing time of virtual turning scene can be reduced by nine times.This study plays an important role in the enrichment of the virtual manufacturing theory and the promotion of the dev elopment of the advanced manufacturing technology.展开更多
In this paper, a new concept, i.e. Generalized Jacobian Matrix of MBS (abbreviation for multibody system) is presented which unifies three concepts of different realms, Partial (angular) velocity in MBS, first order e...In this paper, a new concept, i.e. Generalized Jacobian Matrix of MBS (abbreviation for multibody system) is presented which unifies three concepts of different realms, Partial (angular) velocity in MBS, first order effect coefficient in mechanism, Jacobian Matrix in robotics. This new concept not only enriches and developes kinematics of MBS and makes kinematics theory of MBS concise and being a formal way. but also becomes a new way to kinematic analysis of spatial mechanisms. It is also enlarged the paper that the usage of kinematics of MBS, the identical relationship between kinematics of MBS and error analysis of MBS is revealed.展开更多
文摘With growing economic and social development, carbon emissions caused by energy consumption surge, leading to an exacerbated greenhouse effect, rising average temperatures,melting glaciers, and an unstable global climate,which may all result in more destructive natural disasters.
文摘According to the features of the turning simulation, a simplified Whitted lighti ng model is proposed based on the analysis of Phong and other local illumination model. Moreover, in order to obtain the natural lighting effects, local ray tra cing algorithm is given to calculate the light intensity of every position durin g the course of the simulation. This method can calculate the refresh area befor e calculating the intersection line, simulate the machining environment accurate ly and reduce the calculating time. Finally, an example of the virtual cutting s cene is shown to demonstrate the effects of the global illumination model. If th e CUP is 1.3 G and the internal memory is 128 M, the refreshing time of virtual turning scene can be reduced by nine times.This study plays an important role in the enrichment of the virtual manufacturing theory and the promotion of the dev elopment of the advanced manufacturing technology.
文摘In this paper, a new concept, i.e. Generalized Jacobian Matrix of MBS (abbreviation for multibody system) is presented which unifies three concepts of different realms, Partial (angular) velocity in MBS, first order effect coefficient in mechanism, Jacobian Matrix in robotics. This new concept not only enriches and developes kinematics of MBS and makes kinematics theory of MBS concise and being a formal way. but also becomes a new way to kinematic analysis of spatial mechanisms. It is also enlarged the paper that the usage of kinematics of MBS, the identical relationship between kinematics of MBS and error analysis of MBS is revealed.
