Wheelchairs have improved the lives of many people with limited mobility. Yet, to this day, conventional wheelchairs are still not a viable option for mobility independence in cases of people with severe weakness or p...
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ISBN:
(纸本)9789897583803
Wheelchairs have improved the lives of many people with limited mobility. Yet, to this day, conventional wheelchairs are still not a viable option for mobility independence in cases of people with severe weakness or poor coordination e.g. Amyotrophic Lateral Sclerosis (ALS). Smart wheelchairs (SWs) overcome many of these limitations by adding an extra layer of intelligence to the system. SWs have so far remained mostly inaccessible to the general public, due to a limited market presence and steep costs. this paper thus presents the design and implementation of a novel SW which makes the upgrade of a commercially available motorised wheelchair to a SW a much simpler process. the system is a complete implementation offering low-level hardware control, a specialised ROS architecture and autonomous navigation algorithms allowing shared user control or fully-autonomous movement. Contrary to most other published works, the focus of this paper is to implement a fully-featured working prototype with minimal hardware complexity and an efficient modular software development environment. Initial practical tests in typical use scenarios showcased the successful operation of the complete system. the developed prototype SW has the potential to restore autonomy to people who are unable to use conventional or powered wheelchairs.
the paper designs an automatic control system for restaurant food delivery based on PLC, including the mechanical structure and automatic control system design. the mechanical structure of the system includes horizont...
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ISBN:
(数字)9781728180229
ISBN:
(纸本)9781728180236
the paper designs an automatic control system for restaurant food delivery based on PLC, including the mechanical structure and automatic control system design. the mechanical structure of the system includes horizontal delivery subsystems and a vertical delivery subsystem. the automatic control system includes PLC control and the human-machine interface, which realizes the entire system's automation. At the end of the paper, we analyze the whole system's reliability and economy to reflect the characteristics and practicability of the automatic control system.
this paper describes a tool for generating ROS packages and nodes. Compared to the relatively basic traditional package creation method, this tool can generate a whole node structure, including its life-cycle and the ...
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ISBN:
(纸本)9789897583803
this paper describes a tool for generating ROS packages and nodes. Compared to the relatively basic traditional package creation method, this tool can generate a whole node structure, including its life-cycle and the exposed interface to other ROS nodes. Following a separation of concerns, the developer only defines the interaction means in a XML file, and the tool provides the whole skeleton of the nodes, including the interface creation and management. this way, the developer can focus on his real added value, the implementation of the node logic. Compared to advanced node management frameworks proposed in literature, the tool proposed does not require the developer to understand and agree on complex high-level architecture models. the developer only has to select a template model, and to provide the desired interface to get the code generated. the package generation is made possible thanks to package templates, and we provide withthe generator tool two templates for creating nodes either in C++ or Python. the user has also the possibility to design his own template, so that he can develop the one that best fits his needs and best practices. the package generator code is accessible on public repository hosting facilities.
An accurate extrinsic calibration between a robots' exteroceptive sensors and its manipulator is essential for tasks such as mobile manipulation and tactile exploration. Especially for extrinsic calibration of a m...
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ISBN:
(纸本)9789897583803
An accurate extrinsic calibration between a robots' exteroceptive sensors and its manipulator is essential for tasks such as mobile manipulation and tactile exploration. Especially for extrinsic calibration of a manipulators' end effector and 2D laser scanner, state-of-the-art approaches often require complex calibration targets or sensors which need to be mounted to the end effector. therefore, such approaches are only suitable to a limited extent for use in mobile robotics. In this paper, we present a simple but effective approach to determine the six degrees of freedom transformation between the end effector of a serial manipulator and the center of a 2D laser scanner. In contrast to other approaches, our approach requires only a 1D target for calibration. Whereas complex calibration geometries often require a tool change for calibration, our approach is also applicable using practical objects like a drill mounted to the end effector. As a consequence, a tool change is not required for recalibration for many applications anymore. To evaluate the performance of our approach, we perform the calibration based on simulated as well as real data. We compare our results against the ground truth of a physically closed transformation chain using the lidars' CAD data.
this paper presents the design and modeling of a lightweight tendon actuated robotic limb. the mechanical structure consists of a sequence of four semi-rigid segments realized in thermoplastic polyurethane material an...
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ISBN:
(数字)9781728189819
ISBN:
(纸本)9781728189826
this paper presents the design and modeling of a lightweight tendon actuated robotic limb. the mechanical structure consists of a sequence of four semi-rigid segments realized in thermoplastic polyurethane material and connected through torsional springs. this allows the limb to keep a straight position without the application of forces and facilitates the control of the limb while performing flexion and extension movements. A static model is presented to predict the tension of the tendons in order to reach a defined orientation. Simulations were conducted in a V-REP Python environment to demonstrate the controllability of the limb while performing simple movements and trajectories.
the proceedings contain 26 papers. the special focus in this conference is on Industry 4.0 Model for Advanced Manufacturing. the topics include: Manufacturing process monitoring and control in industry 4.0;on standard...
ISBN:
(纸本)9783030462116
the proceedings contain 26 papers. the special focus in this conference is on Industry 4.0 Model for Advanced Manufacturing. the topics include: Manufacturing process monitoring and control in industry 4.0;on standardization efforts for additive manufacturing;artefacts used for testing 3D optical-based scanners;an approach of development smart manufacturing metrology model as support industry 4.0;intelligent process planning for smart factory and smart manufacturing;model-based manufacturing system supported by virtual technologies in an industry 4.0 context;new trends in machine design within industry 4.0 framework;a cloud computing model for achieving competitiveness of domestic enterprises;Strategic approach for robotics development in SME by value linkage concept;big data analysis as a digital service: Evidence form manufacturing firms;overview of human-robot collaboration in manufacturing;abrasive flow machining of 3D printed metal parts – A scientific review with extension on industrial needs;rejuvenation of business management tools in industry 4.0;Influence of the orientation of steel parts produced by DMLS on the fatigue behaviour;New ISO geometrical product specification standards as a response to industry 4.0 needs;multi-modal multi-agent path finding with optimal resource utilization;the effects of milling and drilling process parameters and different tool path strategies on the quality of the CFRP composites;industry 4.0 in Croatia – Perspective and industrial familiarity withthe (new) digital concept;a bending test of the additively produced porous sample;assessing industry 4.0 readiness in manufacturing companies from Serbia;challenges for uncertainty determination in dimensional metrology put by industry 4.0 revolution.
Unmanned mobile robots are widely used in unknown environments, where the exact overall arrangement of environments may not be available. this paper investigates navigation strategy for mobile robots based on reinforc...
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ISBN:
(数字)9781728198880
ISBN:
(纸本)9781728198897
Unmanned mobile robots are widely used in unknown environments, where the exact overall arrangement of environments may not be available. this paper investigates navigation strategy for mobile robots based on reinforcement learning method to allow mobile robots to navigate in such environments. Deterministic policy gradient algorithm has recently been shown to be effective in complex tasks. However,deterministic policy may not be safe to solve navigation problem in unknown environments due to its determinacy. We propose a learning framework composed of dual policy networks, in which one of the policies acts as a tuner for the other. Multiple simulation results demonstrate that the proposed framework implicitly learns key navigation ability and is more efficient than baseline method.
We propose a symbolic self-triggered controller synthesis procedure for non-deterministic continuous-time nonlinear systems without stability assumptions. the goal is to compute a controller that satisfies two objecti...
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ISBN:
(数字)9781728177090
ISBN:
(纸本)9781728177106
We propose a symbolic self-triggered controller synthesis procedure for non-deterministic continuous-time nonlinear systems without stability assumptions. the goal is to compute a controller that satisfies two objectives. the first objective is represented as a specification in a fragment of LTL, which we call 2-LTL. the second one is an energy objective, in the sense that control inputs are issued only when necessary, which saves energy. To this end, we first quantise the state and input spaces, and then translate the controller synthesis problem to the computation of a winning strategy in a mean-payoff parity game. We illustrate the feasibility of our method on the example of a navigating nonholonomic robot.
Traditionally, the wearisome effort is required to tune the PID parameters and always resulting in erroneous system behavior. the objective of the present work paper is to develop a tuning method for model-free PID co...
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