Instant center is an important kinematic characteristic which can be used for velocity and singularity analysis, configuration synthesis dynamics modeling of multi-degree freedom (multi-DOF) planar linkage. The Aronhold–Kennedy theorem famous locating instant centers four-bar linkage, but single-loop multi-DOF linkages, it fails. Increasing with the number links lack link relationship makes ide...

Analysis of the curvature properties of the link lengths of a four-bar mechanism via Mathematical Modeling Techniques using MATLAB Software. The proper identification of the lengths which has been taken analytically using Freudenstein’s equation, which is an experimental work as well as virtual visualization of the work & the model of a 4-bar linkage ,whose modeling has been done through MATLAB...

This paper presents the dynamic analysis and kinematic parameter optimization of a coupled linkage system for the purpose of employing the system in construction industry. So far, the kinematic optimization of wheel loaders was approached heuristically rather than utilizing elaborate theoretical examinations due to the complexity of coupled linkage structures. The results of the theoretical ana...

The dynamic behaviour of a four-bar linkage driven by a velocity controlled DC motor is discussed in the paper. In particular the author presents the results obtained by means of a specifically developed software, which implements the mathematical models of all components of the system (linkage, transmission, electric motor, control devices). The use of this software enables a more efficient de...

The optimal design of human lower limb prostheses, in particular of knee devices, is fundamental in order to restore the lost functionality and aesthetic aspect of the amputee’s locomotion. Among all knee devices, the four-bar linkage is still the most widespread mechanism, since, despite its simplicity, it allows the prosthesis to be sufficiently stable and, at the same time, to replicate the ...

In this paper we present the synthesis of novel reactionless spatial three-degrees-of-freedom (3-DoF) and 6-DoF mechanisms without any separate counter-rotation, using four-bar linkages. Based on the conditions of dynamic balancing of a single planar four-bar linkage developed elsewhere, the spatial problem is shown to be equivalent to ensuring that the inertia tensor of reactionless four-bar l...

This paper considers optimal synthesis of a four-bar linkage by method of controlled deviations. The advantage of this approximate method is that it allows control of motion of the coupler in the four-bar linkage so that the path of the coupler is in the prescribed environment around the given path on the segment observed. The Hooke-Jeeves’s optimisation algorithm has been used in the optimisat...