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A robot with two independent driving wheels is used popularly as a service robot. Therefore, there is a lot of research on the autonomous locomotion. The robot with two independent driving wheels has a nonholonomic constraint in its model, so that it needs a specific control method when controlling it. In this research, we use an invariant manifold for solving such a nonholonomic constraint. The controller...
Use of a Quadrotor is considered as one of the methods to inspect infrastructures such as a tunnel or a bridge. In such a case, it needs to control the position of the airframe. Note, however, that it is difficult to realize the position control using GPS in environments, such as in a tunnel or under a bridge, because there is a problem, such as the weakness of the GPS signal or the incomplete reaching...
This paper addresses the problem of feature extraction for 3d point cloud data by using autoencoder. Deep learning is one of the most active fields of artificial intelligence, especially in a variety of visual applications, such as image classification and object recognition. However it has not been successfully applied on 3d point cloud data. In this paper, a new method of analyzing the point cloud...
In recent years, autonomous unmanned underwater vehicles (AUVs) for underwater exploration are studied and developed activity. It is important to control the position and attitude of an AUV in underwater with stream change. A conventional AUV moves underwater using screw propellers. In underwater, fishes control own fins and body more freely than an AUV using screw propellers. A kind of the neural...
A holonomic omnidirectional mobile robot with active dual-wheel caster assemblies is proposed as a robotic transport vehicle. With concern to the existence of sudden acceleration and other dynamical effects during maneuver, the tip-over instability monitoring is very important to prevent any unexpected injuries and property damage. This work presents the preventive method of the tip-over occurrence...
In this paper, a new desktop orthogonal-type robot, which has abilities of compliant motion and stick-slip motion, is first presented for lapping small metallic molds with curved surface. The robot consists of three single-axis devices with a high position resolution of 1 μm. A thin wood stick tool is attached to the tip of the z-axis. The tool tip has a small ball-end shape. The control system is...
Control approaches for nonholonomic systems have utilized canonical forms. A nonholonomic double integrator model is the one of canonical forms for nonholonomic systems. Outputs of the controller based on the nonholonomic double integrator model are velocity commands for the kinematic model of a nonholonomic system. In this paper, we consider an extended nonholonomic double integrator model, in which...
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