Design approaches to exoskeletal robots traditionally aimed to achieve mechanical forces many times larger than the level achievable by the corresponding natural musculoskeletal system. This has often obstructed the u...
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ISBN:
(纸本)9781479905492
Design approaches to exoskeletal robots traditionally aimed to achieve mechanical forces many times larger than the level achievable by the corresponding natural musculoskeletal system. This has often obstructed the user's muscles during physical rehabilitation. Moreover, mechanisms designed for excessive force generation are heavy and rigid structures with little compliance and thus are not suitable for many mobile applications. Here, we present a novel biomimetic flexible solenoid-coil artificial muscle (FSAM) fibre with inherent mechanical compliance, a high pulling stroke, and structural flexibility that suit a lightweight wearable exoskeletal robot for rehabilitation use. FSAM consists of a chain of specially designed bobbins of solenoid coils that can slide against each other. The chain allows FSAM to form an arch shape when the coils are energized;this is reminiscent of a natural muscle that bends a joint by a combined contraction of the muscle length and bending in an arch shape. This strategy of bending a joint not only reduces the need for linear contraction but also allows the exoskeletal to be compliant with the contraction morphology of natural muscle.
An ongoing effort within the community of verification and program analysis is to raise the level of abstraction in programming by automatic synthesis. In this paper, we demonstrate how our synthesis engine GAVS+ achi...
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ISBN:
(纸本)9781467314053
An ongoing effort within the community of verification and program analysis is to raise the level of abstraction in programming by automatic synthesis. In this paper, we demonstrate how our synthesis engine GAVS+ achieves this goal by automatically creating control code for the FESTO Modular Production System. The overall approach is model-driven: we reinterpret planning domain definition language (PDDL) as a design contract to model two-player games played between control and environment, such that users can describe (i) basic abilities of hardware components, including sensors (as environment moves) and actuators (as control moves), (ii) topologies how components are interconnected, and (iii) desired specification under a restricted class of linear temporal logic. The model is processed by our game-based synthesis engine, from which intermediate code is generated. By mapping each behavioral-level action to a sequence of low-level PLC control commands, we transform the intermediate code into an executable program. The efficiency of our engine enables to synthesize every scenario presented in this paper within seconds. When the specification evolves, this implies a huge time-gain compared to manual program modification.
Visual appearance based scene recognition has been widely studied in the past decade. However, such systems still present failures in dynamic, heterogeneous urban environments. This paper presents a methodology in ord...
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ISBN:
(纸本)9781467307024
Visual appearance based scene recognition has been widely studied in the past decade. However, such systems still present failures in dynamic, heterogeneous urban environments. This paper presents a methodology in order to integrate an advanced Adaptive Appearance Based Loop-Closing Detection algorithm into a graph optimization based Simultaneous Localization and Mapping algorithm. The system described uses stereo visual data, captured in discrete locations in order to detect loop-closure situations and to build, respectively update the topological map of a large, complex environment.
The conference, in its customary full name 2012 IEEE internationalconference on automation, Quality and Testing, robotics - THETA 18th edition, follows the tradition of the 17 automation and testing related scientifi...
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Passively compliant drives are interesting alternatives to classical stiff actuators in emerging fields like human- robot cooperation, service and rehabilitation robotics. Pneumatic muscles have been found to be inter...
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ISBN:
(纸本)9789898565211
Passively compliant drives are interesting alternatives to classical stiff actuators in emerging fields like human- robot cooperation, service and rehabilitation robotics. Pneumatic muscles have been found to be interesting low-cost actuators for such purposes. To fully realize the (desired) higher sensitivity and at the same time maintain a good control quality, detailed models of the robot's own components are required. For pneumatic muscles, their hysteresis characteristic is a challenging property. In this paper we present a hysteresis model based on a Prandtl-Ishlinskii operator approach and evaluate the resulting performance when the inverse model is used for compensation in the position controller. The evaluation is done on a real multi-axes robot arm.
The implementation of a distributed control algorithm for the safe flight of Unmanned Aerial Vehicles (UAVs) in traffic conditions in an embedded processor unit is presented. Details on the implementation are given. T...
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Risk analysis in combination with terrain classification is a common approach in mobile robotics to adapt robot control to surface conditions. But for climbing robots it is hard to specify, how the robotic system and ...
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In the paper we recover the static characteristic of Wiener-Hammerstein (sandwich) system from inputoutput data. The system is excited and disturbed by random processes with arbitrary distribution. Two kernel-based es...
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An approach for nonholonomic two-wheeled mobile robot trajectory tracking and obstacle avoiding is presented in this paper. If the desired trajectory is provided by high level planner, trajectory tracking problem can ...
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ISBN:
(纸本)9789898565211
An approach for nonholonomic two-wheeled mobile robot trajectory tracking and obstacle avoiding is presented in this paper. If the desired trajectory is provided by high level planner, trajectory tracking problem can be solved in various ways. In this paper, tracking is provided using proportional-integral (PI) or fuzzy logic controller (FLC). Unfortunately, tracking is never perfect, due to uncertainties and obstacles can change their positions in time. In order to overcome these difficulties, additional correction controller must be used. Here is proposed fuzzy controller, which slightly changes control action of the tracking controller in order to prevent collision with obstacles. This approach is proved to be efficient even in dynamic environments. Simulation results are presented as illustration of the proposed approach.
The main contribution of this article the implementation of a new method for the usage of submaping algorithms, which surpasses the limitations arising from the need of statistical independence between the submaps, wh...
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ISBN:
(纸本)9781467307024
The main contribution of this article the implementation of a new method for the usage of submaping algorithms, which surpasses the limitations arising from the need of statistical independence between the submaps, when mapping large scale areas. This method relies on the commonly used structure of SLAM (Simultaneous Localization and Mapping) mandatory for building submaps which share information, but stay conditionally independent. This approach is able to recover the final map, without introducing other approximations ignoring the ones already introduced by the EKF (Extended Kalman Filter), all this in a linear time. The algorithm has been tested for the case of local submaps because the effects of linearization errors are smaller in this way. The obtained maps are more accurate and consistent compared with ones obtained by EKF or EIF (Extended Information Filter) methods, which are not using local coordinates.
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