Motion control

A linear stage or ‘Linear Slide’ as it is mostly called is one of the components found in precision motion systems. It is more of a restrictive component as it limits the movement of an object to a single axis or direction. They are slides that provide a more controlled and distinct positioning for objects along the linear axis of its pathway. They are applied in various forms of automated machinery. Linear Stages are like navigation systems for these machinery and their job is to set them in tune with their axes. Now, with this restriction in movement of these motion systems, you can expect lots of friction, energy loss of even a stick and slip situation. However, they do make use of some linear bearing methods to alleviate these minor issues.

Unmanned underwater vehicles (UUVs) have become an integral part in helping humans do underwater explorations more efficiently and safely since these vehicles can stay underwater much longer than any human can possibly do and they require little or almost no human interaction. These vehicles are subject to dynamic and unpredictable nature of the underwater environment resulting to complexities in their navigation. This paper proposes a fuzzy logic-based controller to allow the vehicle to navigate autonomously while avoiding obstacles. The said controller is implemented in an actual low-cost underwater vehicle equipped with magnetometer and ultrasonic sensors. The intelligence of the UUV includes a two fuzzy logic block, namely Motion Control block and Heading Correction block. The fuzzy logic controller takes in target positions in X, Y and Z axes. Also, the heading error and rate of heading error are included as inputs in order to correct the bearing or direction of the vehicle. A ...

Nine chronic stroke subjects trained over a period of 6 weeks, with 3 one-hour sessions of robot-assisted therapy per week, consisting in two exercises requiring active participation pro-moted by therapeutic games. Behavioral data collected by the Haptic Knob were ...

This paper reports high-precision motion control at the target position and the offline compensation of the straightness error occurring during the motion of the magnetically levitated stage supported by the linear magnetic bearing. The linear magnetic bearing is composed of electromagnets and sensors in the same module to enable easy maintenance and to reduce the machining error, and the conventional

Summary Virtual humans are the computer representation of real humans in virtual worlds. Human representation in virtual worlds is vital as people are central elements of the real and virtual worlds. Animating virtual humans remains a challenging task due to the large number of degrees of freedom in the human skeleton, the ability of human observers to detect unnatural movements, and the complexity of realistic appearance and behaviour. The difficulty of the problem has resulted in research into many subproblems of human ...