J.P. Meijaard
27 records found
1
Authored
The dynamic balancing of flexible mechanisms, that is, the reduction or elimination of shaking forces and shaking moments on the support structure, is considered. Two approaches are pursued: one uses similarity and the other modal balancing. A single rotating link can be balan ...
The use of principal points and principal vectors in the formulation of the equations of motion of a general 4R planar four-bar linkage is shown with two kinds of methods, one that opens kinematic loops and one that does not. The opened kinematic loop approach analyses the mov ...
This paper is a first approach in finding design principles for the design of shaking force balanced compliant mechanisms. Shaking force balance means that the motions of the mechanism do not create any resultant dynamic reaction forces on the base, eliminating base vibrations ...
Analytic modelling of the dynamics of the four-bar mechanism
A comparison of some methods
For the Delta robot, a high-speed parallel pick-and-place manipulator, base vibrations are a significant problem. Especially since the Delta robot is suspended above its workpiece, it requires a large, stiff, and heavy base frame for fast and accurate motions. Dynamic balancin ...
The motion of a four-bar linkage is considered with the goal to study the use of principal vectors to formulate the equations of motion and to get insight. Firstly, kinematic relations for the positions, velocities and accelerations are derived. Then, the motion of the centre ...
Comparison of three-dimensional flexible beam elements for dynamic analysis
Classical finite element formulation and absolute nodal coordinate formulation
Three formulations for a flexible spatial beam element for dynamic analysis are compared: a Timoshenko beam with large displacements and rotations, a fully parametrized element according to the absolute nodal coordinate formulation (ANCF), and an ANCF element based on an elast ...
In this paper, an experimental validation of some modelling aspects of an uncontrolled bicycle is presented. In numerical models, many physical aspects of the real bicycle are considered negligible, such as the flexibility of the frame and wheels, play in the bearings, and pre ...
Comparison of three-dimensional flexible thin plate elements for multibody dynamic analysis
Finite element formulation and absolute nodal coordinate formulation
Comparison of three-dimensional flexible beam elements for dynamic analysis
Finite element method and absolute nodal coordinate formulation
In the case of small elastic deformations in a exible multi- body system, the periodic motion of the system can be modelled as a superposition of a small linear vibration and a non-linear rigid body motion. For the small deformations this analysis re-sults in a set of linear d ...