In this paper a scalable architecture with a computer vision subsystem as an integrated part to achieve a fast and robust navigation for almost autonomous mobile systems in dynamic environments is presented. The princ...
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In order to more accurately simulate the load distributions and histories experienced by automotive seats in field use, more biofidelic motion and loading devices are needed. Lear and KUKA have developed a system capa...
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The assembly of complex microsystems consisting of several single components (i.e. hybrid microsystems) is a difficult task that is seen to be a real challenge for the robotic research community. It is necessary to co...
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The assembly of complex microsystems consisting of several single components (i.e. hybrid microsystems) is a difficult task that is seen to be a real challenge for the robotic research community. It is necessary to conceive flexible, highly precise and fast microassembly facilities. In this paper the development of a microrobot-based microassembly station is presented. Mobile piezoelectric microrobots with dimensions of some cm/sup 3/ and with 5 DOF perform various manipulations either under a light microscope or within the vacuum chamber of a scanning electron microscope. The components of the station and its control system are described. The latter comprises a vision-based sensor system for automatic robot control, user interfaces, a re-configurable parallel computer array and an assembly planning system. Specific problems that occur when using microrobots in an SEM and our research activities on the development of force microsensors integrated into the microrobots' grippers are described as well.
Transporting an object on a mobile platform always transfers accelerations to this object. In many cases this is undesirable, so a compensation would be helpful. There are passive systems, but they can only react and ...
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Transporting an object on a mobile platform always transfers accelerations to this object. In many cases this is undesirable, so a compensation would be helpful. There are passive systems, but they can only react and have no other use like manipulating. This paper presents a solution for both compensation of accelerations and precise and powerful manipulation. In order to achieve a compensation a Stewart platform is mounted on top of a mobile robot. Usually a Stewart platform is used to generate accelerations. In this application the acceleration vector of the robot is inverted and sent to the filter, which performs the platform motion depending on the robot movement. This filter handles all six degrees of freedom, so every movement can be taken into account, if it is determined by acceleration or inclination sensors. Furthermore, this combination is also a very precise docking system, since the Stewart platform can easily correct the uncertainty in the robot position.
Microsystem technology demands for advanced manipulation facilities which can assemble complex microsystems consisting of many single components (i.e. hybrid microsystems). To perform fully automated microassembly, pr...
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Microsystem technology demands for advanced manipulation facilities which can assemble complex microsystems consisting of many single components (i.e. hybrid microsystems). To perform fully automated microassembly, problems specific to the handling of micro parts have to be considered. It is necessary to introduce flexible, highly precise and fast microassembly methods. Therefore, different microrobots, which offer the possibility to carry out an assembly process under a light optical microscope with a motion resolution of up to 20 nm and speeds of up to 3 cm/s, have been developed by an interdisciplinary research group at the University of Karlsruhe. These robots are embedded into a microassembly desktop station. The paper presents the design, actuation principle and control of the flexible microrobotic system MINIMAN.
The execution of automatically generated assembly plans by robots is one of the key technologies of modern and flexible manufacturing. During the execution of assembly sequences the robot comes into contact with the e...
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The execution of automatically generated assembly plans by robots is one of the key technologies of modern and flexible manufacturing. During the execution of assembly sequences the robot comes into contact with the environment. Since there are positional and geometrical uncertainties from object representation, robot motion, and sensor information, compliance is used typically to prevent excessive contact forces. The contact forces and the resulting torques provide information about the contact geometry which is used to guide the assembly operation. We present a fast algorithm to identify assembly process states considering static friction under uniform gravity. This identification of assembly process states enables a robot to select and modify its motion strategies adequately according to the state. We give a symbolic representation of contact states and analyze the static properties of assemblies at each contact state by using the theory of polyhedral convex cones.
Good observation of a manipulation presentation performed by a human teacher is crucial to further processing steps in programming by demonstration in interactive robot programming. This paper outlines a concept of ho...
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Good observation of a manipulation presentation performed by a human teacher is crucial to further processing steps in programming by demonstration in interactive robot programming. This paper outlines a concept of how this can be done using visual and finger measuring sensors. The input sources include: a data glove which classifies several gestures and grasps, an active stereo vision, and a fixed ceiling camera. The hardware used is presented together with the technical concepts of processing and the acquired sensor information fusion, so called elementary cognitive operators. All the sensor sources use time-efficient algorithms, since sensor data must be processed in real-time.
This paper presents an approach to sensor-based obstacle modeling in a configuration space for manipulator motion planning in unknown environments. In order to achieve this objective, an efficient algorithm is used to...
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Service robots which should perform human-like operations will penetrate into a great number of applications in the future. Requirements for this is high flexibility, autonomy and the ability to adapt to new situation...
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Service robots which should perform human-like operations will penetrate into a great number of applications in the future. Requirements for this is high flexibility, autonomy and the ability to adapt to new situations. The paper describes a design concept and a prototype implementation of an autonomous mobile humanoid service robot, which should mainly support people in their daily life as a personal or an assistance robot. The state of the research is that the general concept is developed and two anthropomorphic arms are built up. In the article the sensor system and the control architecture of the anthropomorphic robot are described. To evaluate the performance and motion abilities of the anthropomorphic arm the human arm kinematics and properties are discussed.
In the field of research and development of grippers in object-handling applications, many research results in improving grippers performances have been achieved, and many kinds of multifinger grippers have been devel...
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In the field of research and development of grippers in object-handling applications, many research results in improving grippers performances have been achieved, and many kinds of multifinger grippers have been developed. By using multifinger grippers, it is possible to grasp different objects of different shapes without changing grippers; and most importantly, it can manipulate the grasped object in the hand, under the condition that the object is controlled in real-time. Therefore, an object-pose controller with feedback from an object-pose sensor is presented in this paper.
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