Calibration accuracy and convenience are very important for the rapid production of vision-based robots. Although there are many calibration methods for the 3D vision system, the convenience of calibration cannot meet...
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Acoustic manipulation techniques are becoming increasingly common with a range of applications in the biomedical research, microassembly, and lab-on-a-chip. Recently, a class of devices have attracted considerable att...
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ISBN:
(纸本)9781728109480;9781728109497
Acoustic manipulation techniques are becoming increasingly common with a range of applications in the biomedical research, microassembly, and lab-on-a-chip. Recently, a class of devices have attracted considerable attention which utilize dynamic and reconfigurable acoustic fields, known as dynamic-field acoustic devices. A common method of applying dynamic fields is to use mode-switching by rapidly altering the excitation frequency. Such methods generally rely on the switching being performed faster than the time constant associated withthe particle motion. Nevertheless, it remains a grand challenge to eliminate or at least reduce the switching time to a minimal value. In this paper, we suggest employing a high-speed controller to minimize the switching time, enabling continuous particle manipulation in a dynamic-field acoustic device. As a proof-of-concept, we apply such idea to a classic acoustic manipulation device, a Chladni plate which consists of a centrally-actuated vibrating plate. By employing a closed-loop real-time controller, we show successful manipulation of particles on the plate on predefined trajectories. the high-speed switching methodology can also be applied to other dynamic-field acoustic methods, such as surface acoustic wave (SAW) devices, acoustic levitators, and in-fluid acoustic devices. this can result in faster and smoother particle manipulation in such devices.
In the automatic GTAW robot welding process, workpiece-surface unevenness and tungsten-electrode loss are so common that frequently cause the fluctuation of welding arc length and the unstable welding quality. In orde...
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It is an extremely important task to detect and repair the magnetic conductivity walls of large tanks, steel bridges, ship walls and aircraft exterior surfaces in the industrial field. this kind of task is usually car...
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In this paper, we present a hybrid exoskeletal-soft glove for the application of on-axis angle sensors that can be placed close to the center of rotation of the digit joints. 3D printed exoskeletal digit segments that...
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ISBN:
(纸本)9781728127552
In this paper, we present a hybrid exoskeletal-soft glove for the application of on-axis angle sensors that can be placed close to the center of rotation of the digit joints. 3D printed exoskeletal digit segments that run medially on most digits connect to low friction bearings. Exoskeletal segments and bearings provide rigid fixation points for a variety of traditional angle sensors, while a combination of textile and rigid structure fixate exoskeletal digits to the digits and hand. Exoskeletal digits are designed modularly so that only required digits are used and to reduce difficulty in donning and doffing. On-axis measurement may prove useful in control or assessment tasks in rehabilitation. the articulation of the digits while wearing the glove is demonstrated, albeit without sensors, showing little restriction at an early stage of the design process. Exoskeletal metacarpophalangeal joints of the 3rd and 4th digits require more work as the flexion/extension joint axis is inaccessible and moves when the digits are articulated. the proposed device must be customized for an individual and will facilitate an alternative approach to existing hand posture monitoring techniques.
An adaptive sliding mode control algorithm based on the double power approach law is proposed toward the problem of the precision of the manipulator's rotary motion in the automatic loading system of *** speed of ...
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this paper is devoted to the precise attitude control of flexible spacecraft with rotating structures, which is modeled as a rigid platform with some attached flexible appendages. During attitude maneuver, the excited...
ISBN:
(数字)9781728198576
ISBN:
(纸本)9781728198583
this paper is devoted to the precise attitude control of flexible spacecraft with rotating structures, which is modeled as a rigid platform with some attached flexible appendages. During attitude maneuver, the excited vibration of flexible appendages would downgrade the performance of the spacecraft. In order to address this key issue, the idea of a coupling attitude controller, in which the positive position feedback control method is introduced to suppress the elastic vibration based on piezoelectric materials is proposed, while a robust H ∞ controller withthe consideration of uncertainties is utilized to controlthe attitude. Also, the stability of the coupling attitude controller is analyzed. the methodology is implemented on a spacecraft attitude control problem in which the platform undergoes attitude maneuver. the simulation results show the efficiency of the coupling attitude controller. the proposed theory is meaningful for flexible spacecraft to achieve high pointing precision and stability.
In this paper a control strategy using backstepping technique for multilevel inverter based active power filter control is developed. Performances comparison between backstepping strategy and PI regulators based metho...
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ISBN:
(数字)9781728163567
ISBN:
(纸本)9781728163574
In this paper a control strategy using backstepping technique for multilevel inverter based active power filter control is developed. Performances comparison between backstepping strategy and PI regulators based methods is provided. Simulation results prove the robustness and accuracy of proposed technique compared with conventional methods.
Aiming at the kinematics model of wheeled mobile robot, a data-driven T-S fuzzy predictive control method is proposed.. this method uses system identification to obtain the T-S fuzzy model of the car, i. e. the linear...
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control of rotary double inverted pendulum system is studied withthe internal model principle. Based on the dynamic characteristics of the given signal variable and the internal model principle, the servo compensator...
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