in this paper the effects of non-linearity of suspension on dynamic behavior of a railway wheelset has been studied. this wheelset has four degrees of freedom that with two constraints it has reduced to two degrees of freedom. vermeulen-johnson theory has been used to calculate contact forces between wheel and rail. in this study the creep coefficients have considered constant. any linearizatio...

Motion estimation has traditionally been approached either from a pure discrete point of view, using multi-view tensors, or from a pure continuous point of view, using optical-flow-based techniques. This paper builds upon the recent developments of hybrid matching constraints for motion estimation. These hybrid matching constraints are based on both corresponding feature points and the motion o...

We propose an intuitive motion editing technique allowing the end-user to transform an original motion by applying position constraints on freely selected locations of the character body. The major innovation comes from the possibility to assign a priority level to each constraint. The resulting scale of user-defined priority levels allows to handle multiple asynchronously overlapping constrain...

Unit quaternion is an ideal parameterization for joint rotations. However, due to the complexity of the geometry of S group, it’s hard to specify meaningful joint constraints with unit quaternion. In this paper, we have proposed an effective and accurate method to specify the rotation limits for joints parameterized with the unit quaternion. Joint constrains constructed with our method are adeq...

straints, motion capture. In this paper, we present a technique for motion: the problem of adapting an animated motion from one character to another. Our focus is on adapting the motion of one articulated figure to another figure with identical structure but different segment lengths, although we use this as a step when considering less similar characters. Our method creates adaptations that pr...