A new spatial 3-degree-of-freedom(3-DoF)parallel mechanism,which can be used in a parallel kinematics machine,is *** new mechanism consists of a base plate,a moving platform and three legs that connect the aforementio...
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A new spatial 3-degree-of-freedom(3-DoF)parallel mechanism,which can be used in a parallel kinematics machine,is *** new mechanism consists of a base plate,a moving platform and three legs that connect the aforementioned two platforms. The moving platform has three DoFs,which are two translations and one rotation,with respect to the *** this structure,only single-DoF joints are involved,which is one of its *** inverse and forward kinematics problems of the mechanism are *** of them are described in closed forms,which will be very helpful for the workspace analysis geometrically,singularity investigation and the control *** proposed mechanism can not only be used in the design of a parallel kinematics machine, but be applied to industrial robots,simulators and micro-manipulators as well.
Compound bow was invented in Missouri in *** main advantage of this type of bow is the so-called let-off property,which is determined by profiles of one or more *** literature used empirical methods to determine the c...
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Compound bow was invented in Missouri in *** main advantage of this type of bow is the so-called let-off property,which is determined by profiles of one or more *** literature used empirical methods to determine the cam *** paper proposes an analytical approach to determine the relationship among draw-force,spring force,and cam *** from study demonstrated while mechanical advantage is decreasing when the bow is drawn,the cam profile can transfer tension forces between main and secondary strings,making draw-force *** combined effect produced the so-called let-off *** this working principle analytically explained,optimal design tools such as calculus of variations can be applied to optimize the cam profile *** goal will be limiting the maximum draw-force while maximizing the total energy stored in the bow limbs,achieving largest possible arrow velocity.
The 3-dimensional braided composite beam is studied in this *** on the damping element model and the expression of dissipation energy of the 3-dimentional braided composite materials,a method for calculating the dampi...
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The 3-dimensional braided composite beam is studied in this *** on the damping element model and the expression of dissipation energy of the 3-dimentional braided composite materials,a method for calculating the damping of 3-dimensional braided composite beam is given,and the formula for calculating the specific damping capacity of such kind of beam is *** the same time,the optimization synthesis of the beam is done using the constrained variable metric optimization method by looking the maximum damping as optimization objection,the stiffness and process requirements as the constraint condition and the fibre braided angle and cross-section dimension of beam as the design variables.A numerical example is given in the end.
A servo mechanical press is programmable to adapt to various stamping operations that is possible to be widely used in the *** optimized design of the servo press with a double-knuckle linkage is studied based on the ...
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A servo mechanical press is programmable to adapt to various stamping operations that is possible to be widely used in the *** optimized design of the servo press with a double-knuckle linkage is studied based on the physical model ***,the press parameters are normalized to produce a bounded solution *** the mechanical advantage and force load of every link are modeled as performance indices of the servo mechanical press and performance atlases are drawn *** performance atlases are very helpful to the design of the servo mechanical press with a global *** example is given to illustrate the method.
In industry,tip modification of gear teeth is widely used to reduce the peak value of the dynamic contact loads of an engaging spur gear ***,the amount of tip modification is determined by the experience of *** usage ...
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In industry,tip modification of gear teeth is widely used to reduce the peak value of the dynamic contact loads of an engaging spur gear ***,the amount of tip modification is determined by the experience of *** usage of tip modification will decrease the running life of a meshing spur gear *** this paper,the effect of tip modification of gear teeth on the running life of an engaging spur gear pair is *** with the dynamic model for an engaging gear pair and the standard,ANSI/AGMA 2001-B88,two types of tip modification are used to study their effects on the running life of a running spur gear pair.A computational algorithm is developed to simulate the running life with tip modification of gear *** results present how tip modification of gear teeth influences the running life of a meshing spur gear pair.
＜正＞This paper focuses on a new hybrid robot for CT-guided minimally invasive cryosurgery, The limited operation environment in minimally invasive cryosurgery was *** hyhrid robot with 9-DOF was *** structure of hyb...
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＜正＞This paper focuses on a new hybrid robot for CT-guided minimally invasive cryosurgery, The limited operation environment in minimally invasive cryosurgery was *** hyhrid robot with 9-DOF was *** structure of hybrid robot was analyzed based on screw theory and Displacement Manifold （DM）.The characteristic functions of displacement output of serial machine and parallel machine were put *** Motion Synthesis Method （MSM）,The DM of hybrid robot was deduced.A 4-DOF parallel robot with high dexterity was brought forward and designed,the kinematics control and dynamics control of which were *** final structure of hybrid robot was *** dexterity of hybrid robot was defined and calculated in terms of Riemann Manifold （RM）. Simulative clinical experimentation showed that absolute locating precision of hybrid robot arrived at 1.08mm,which can meet the requirement of clinical cryosurgery.
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