Authors:
Fumitoshi Matsuno,
Kazutaka Mogi,
Volume: 1, Page 4791 Paper number 79
Abstract:
In this paper we define the redundancy controllable system and propose
control law and structure design methodology of redundant snake robots
based on the wheeled link model. We find that introduction of links
without wheels and shape controllable points in the snake robot's body
makes the system redundancy controllable. In this case the head's velocity
of the snake robot does not determine all joint velocities of the robot
uniquely. We introduce the cost function related to the measure for
the singularity and the manipulability of the system, and construct
a controller with considering the redundancy. Using redundancy, it
becomes possible to accomplish both the main objective of controlling
the position and the posture of the snake robot head and the shape
of the snake robot, and the sub-objective of the singular configuration
avoidance. From simulation results we find that the crawling motion
of the snake robot is natural.
Authors:
Masahiro Miyazaki,
Mitsuji Sampei,
Masanobu Koga,
Akiko Takahashi,
Volume: 1, Page 4797 Paper number 2035
Abstract:
While many researchers have been working on hopping gait systems,
most of the previous works have focused on the mechanism designed by
Raibert which has two actuators. In this paper, we consider the acrobot,
which has only one actuator as our model of a hopping gait system.
In spite of difficulty of realizing acrobot's hopping gait, it produces
more interesting and attractive control problems than Raibert's model.
Furthermore, the hopping principle of legged systems can be understood
by treating the system which is difficult to control by intuition
like acrobot.
Authors:
Mark W. Spong,
Rogelio Lozano,
Robert Manony,
Volume: 1, Page 4803 Paper number 1512
Abstract:
In this paper we discuss the nonlinear control of a novel biped robot
with three-degrees-of-freedom and two control inputs, whose dynamics
are linear apart from the gravitational torque and the impact equations.
We show that the equations of motion are locally feedback linearizable
by nonlinear change of coordinates and nonlinear feedback in a region
that includes all walking gates of interest. We combine the feedback
linearization control with control of the resulting linear system and
the nonlinear impact equations to generate a stable walking gate.
Authors:
Keon Young Yi,
Volume: 1, Page 4809 Paper number 2060
Abstract:
This paper presents a compliant ankle mechanism and its implementation
for a biped robot without actuators for the ankle joints. Ankle joints
have been built using springs and mechanical constraints, which give
a flexibility of joint within a predefined range and stiffness beyond
the range. The biped with compliant ankles proposed here makes foot
landing easy, and weight and cost of legs are also reduced. As the
cost of the advantages, however, the control problem becomes more difficult
because the control torque of the ankle joint to put the biped in a
desired walking gait cannot be provided from the compliant ankle joint.
To overcome this problem, we proposed a pseudo static walking gait
with dynamic gait modification method by adjusting the position of
a hip joint. Experimental results with the biped KUBCA are given to
show the validity of the proposed controller.
Authors:
Luigi Cambrini,
Christine Chevallereau,
Claude H. Moog,
Radoslav Stojic,
Volume: 1, Page 4815 Paper number 1490
Abstract:
The control of an underactuated biped robots in single support phase
can be done choosing a certain number of output functions which are
dependent on the state variables, i.e. on angular positions and velocities;
the choice of these output functions is that better if they yield the
definition of a minimal phase system. In the paper some examples are
discussed. It is suggested that the underlying mathematical problem
states and solves the problem in a concise manner. This goes through
the application of the Pfaff-Darboux Theorem and differential geometric
tools.
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