Real-time linear robust control of a two-phase hybrid stepper motor with quantitative feedback theory method in micro-stepping operation is considered in this paper. Utilizing the phase currents as inputs, linear robu...
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Real-time linear robust control of a two-phase hybrid stepper motor with quantitative feedback theory method in micro-stepping operation is considered in this paper. Utilizing the phase currents as inputs, linear robust controller is derived for a hybrid stepper motor that achieves robustness to parametric and dynamic uncertainties such as viscous friction, load torque, flux linkage and other uncertainties. Simulation and experimental studies are presented to show the efficiency of the control design approach.
This paper presents new methodology to solve the inverse dynamics of the humanoid robots. The objective is to calculate the joints' torque in order to select in optimal way the robot's gait and actuators. The ...
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This paper presents new methodology to solve the inverse dynamics of the humanoid robots. The objective is to calculate the joints' torque in order to select in optimal way the robot's gait and actuators. The main advantage of the method is its simplicity that everyone can implement it easily using common software packages which are not prepared for the humanoid robot modeling, like Matlab robotics toolbox. The inverse dynamics solving is divided in two parts, the upper and lower extremities (including the body). At the same time it is necessary to analyze separately the phases on simple, and double support. The first one doesn't present so much difficulty by using conventional manipulator dynamic modeling. But during the double support phase the modeling is performing for each leg separately by using balanced mass distribution between them. This distribution is based on the reaction forces calculation for each supported leg. The developed method had been applied to the 21 DOF and 1.4 m height Rh-0 humanoid robot under development at the robotics Lab. of the University Carlos III of Madrid.
In this paper, design and real time experimental implementation of fuzzy gain scheduling of PID controller for hybrid stepper motor in micro-stepping operation is described that was developed to track the desired posi...
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In this paper, design and real time experimental implementation of fuzzy gain scheduling of PID controller for hybrid stepper motor in micro-stepping operation is described that was developed to track the desired positioning problem. The control problems characterized by mathematical models exhibit significant nonlinearity and uncertainty. The good performance of proposed fuzzy PID controller is shown.
In this paper, a class of parallel manipulators known as Rotary Positioners (RP) will be analyzed. A Rotary Positioner is actuated by six circular motors on the circular base and does not involve any prismatic joint. ...
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In this paper, a class of parallel manipulators known as Rotary Positioners (RP) will be analyzed. A Rotary Positioner is actuated by six circular motors on the circular base and does not involve any prismatic joint. Therefore, it has constant length limbs. A model of an RP is presented. The constraints related to passive joints and links interference are formulated and the workspace of a normalized RP is computed accordingly. The optimal combination of the main parameters for maximizing the workspace volume of the RP is also given.
In this paper, we propose a control architecture for meandering locomotion of snake-like robots based on neural oscillator network (NON). The proposed architecture is composed of a network of central pattern generator...
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In this paper, we propose a control architecture for meandering locomotion of snake-like robots based on neural oscillator network (NON). The proposed architecture is composed of a network of central pattern generators (CPGs) to realize propagation of purposive oscillation with specific phase shift. By implementing this architecture to a simulator with consideration of mechanical dynamics of a real snake-like robot, we present realization of meandering motion and preliminary policies about parameter settings of the NON. Moreover, we present that real robot can successfully exhibit meandering movement by using controller output of the proposed architecture.
Shape memory alloys (SMA's) are inherently non-linear devices exhibiting significant hysteresis in their stress strain-temperature characteristic. We have used the variable sub-layer SMA model of Ikuta (1991) to e...
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Shape memory alloys (SMA's) are inherently non-linear devices exhibiting significant hysteresis in their stress strain-temperature characteristic. We have used the variable sub-layer SMA model of Ikuta (1991) to extract the advanced dynamic model of our proposed varying stress SMA actuator. A nonlinear finite element analysis was used to model the proposed bending spring in the actuator and the extended variable sub-laver model of Ikuta was considered to extract stress-displacement relations. Finally, these two models are combined with thermo dynamic model of SMA and a schematic flowchart is proposed to calculate SMA resultant strain under an arbitrary current input. At the end, we applied this model to extract open loop harmonic and step responses of our proposed SMA actuator.
Hyper-redundant manipulator has more degrees of freedom than the least necessary to perform a given task, thus it has the features of overcoming conventional industrial robot's limitation such as improving its kin...
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Hyper-redundant manipulator has more degrees of freedom than the least necessary to perform a given task, thus it has the features of overcoming conventional industrial robot's limitation such as improving its kinematics and dynamic performances. Crucial as it is, effective control of hyper-redundant manipulator is difficult for its redundancy. A novel shape control technique based on the concept of variable structure regular polygon and subsystem has been proposed. This technique, using variable structure regular polygon and neural networks models, is completely capable of solving the control problem of a planar hyper-redundant manipulator with any number of links following any desired path. With regular polygon side number's variety and its shape's transformation, the manipulator's configuration changes accordingly and moves actively to perform the task form point to point or following a path. Compared with other methods to our knowledge, this technique has such superiorities as fewer control parameters, higher precision and less computation. Simulation of a six-link modularized manipulator's inspection work in a bottle-like concave has demonstrated that this control technique is available and effective.
Wall cleaning and maintenance of high-rise buildings is becoming one of the most appropriate fields for robotization due to its current low level of automation and lack of uniform building structure. The last decade h...
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Wall cleaning and maintenance of high-rise buildings is becoming one of the most appropriate fields for robotization due to its current low level of automation and lack of uniform building structure. The last decade has seen an increasing interest in developing and employing service robots for cleaning glass walls which is always very dangerous and strenuous in mid-air. In this paper, we propose a new kind of cleaning robot named sky cleaner which is totally actuated by pneumatic cylinders and sucked to the glass wall with vacuum suckers. The constraints for designing are discussed. After that, the drive method, principle of attachment, mechanical construction and unique aspects are presented in detail. A testing simulation shows that the robot can cross an obstacle safely and reliably when it moves from one column glass to another in the right-left direction. In the end, a summary of the main special features of the cleaning robot are given
The path of the snake-like robot has no repetition because its motion is influenced by manifold indeterminate factors such as ground condition, mechanism's vibration and motor voltage's variety. A novel path p...
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The path of the snake-like robot has no repetition because its motion is influenced by manifold indeterminate factors such as ground condition, mechanism's vibration and motor voltage's variety. A novel path planning technique based on serpenoid curve and genetic algorithms (GAs) has been proposed to control the snake-like robot in Shenyang Institute of automation (SIA, China). First, the ranges of the path and the curvature deviation have been calculated approximately and set as the bounds of genetic algorithms. Then using real time dual genetic algorithms, this path planning technique not only can decide the shortest path and the minimum curvature deviation, but also can limit the motion error's influence. Simulation results show that the results of the second layer of GAs are more available than that of the first layer of GAs and this novel technique is effective for the path planning of the SIA snake-like robot.
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