|
|
Finding a mechanism with (4, 7) filtration corresponding to the path geometry
Rajsiglová, Eva ; Zalabová,, Lenka (referee) ; Hrdina, Jaroslav (advisor)
The subject of this Bachelor's thesis is control theory of mechanism, the so-called trident snake robot. From a viewpoint of control theory, it is classified as a nonholonomic system whose controllability is determined by vector fields. In this thesis, input vector fields are obtained from the system of nonholonomic equations. The Lie bracket operation is applied on this vector fields. On the basis of an analysis of the results of the Lie bracket operation, the fulfillment of the definition of the generalized path geometry is verified for the particular models of the trident snake robot. Finally, Hamiltonian function and Christoffel symbols, needed to compile equations of geodesics, are calculated.
|
|
| |
|
|
Control theory in robotics
Bartoňová, Ludmila ; Hrdina, Jaroslav (referee) ; Vašík, Petr (advisor)
This thesis deals with the local control of a snake robot. The model control system is derived from kinematic equations and local controllability is investigated by means of Lie brackets. Then we describe some elementary motions along flow of the controlling vector fields and show the meaning of a periodic input. Another control model is formed by an approximation of the first system. Afterwards, both systems are compared by means of sub-Riemannian metric and thus the qualitative analysis is made.
|
|
|
Geometric models of a snake robot control
Byrtus, Roman ; Hrdina, Jaroslav (referee) ; Vašík, Petr (advisor)
This thesis deals with the geometric theory of control of a robotic snake. The thesis includes required definitions of differential geometry and control theory, which are used to describe and derive the control model for a three segment robotic snake. The model is applied in the simulation environment V-REP.
|
|
|
Geometric optimal control of a snake robot
Vechetová, Jana ; Hrdina, Jaroslav (referee) ; Vašík, Petr (advisor)
This thesis deals with the description of robotic snake the trident snake robot. From a viewpoint of control theory the robot is classified as a nonholonomic system whose controllability is determined by vector fields. We use the operation Lie bracket to create other necessary control vector fields to ensure local controllability of this system. Then we propose the motion planning algorithm. Finally some of the motions caused by the control vector fields are verified in a simulation environment called V-rep.
|
|
|
Dynamics of Snake Robots
Kubiena, Jaromír ; Doupovec, Miroslav (referee) ; Návrat, Aleš (advisor)
In this thesis, we deal with the mathematical description of the kinematics and the dynamics of mechanical systems. Then we focus on the particular mechanical system which is the Square robot with four legs with active joints and passive wheels, which moves on horizontal plane. The kinematics of the mechanical system is described by the control matrix, then we use it to express the equations of motion. We compute the dynamics the robot by using Lagrange equations. We verify that the mechanical system is nonholonomic constrained and we verify controllability by using Lie bracket and distribution. We find the singular postures of the robot.
|
guest ::
