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In this paper, we describe a portable Omnidirectional Vision System for Environment Perception (OVSEP) with 5 Degrees of Freedom (DOFs). OVSEP has a modular design and it is equipped with three main components: hardware, control architecture and visual processing part (omnidirectional vision and stereovision). A face detection algorithm and a method for 3D reconstruction have been used to evaluate...
Series elastic actuation (SEA) has been widely used for output force/torque regulation, however, the nonlinearity introduced by its torsion spring hysteresis will greatly affect the quality of feedback control. Thus an experimental procedure is conducted for the modeling and identification of spring hysteresis effect, based on which a compensated control scheme is given. Experiment results show that...
Cranial nerve examination takes an important role in the physical examination. All the medical staffs need to be trained to master the skills for examination. By now, several training methods have been carried out for medical training including training with the simulated patient (SP). However, considering the characters of eyeball, the involuntary actions cannot be simulated by Sp. With the developments...
Neurologic examination takes an important role in the physical examination. By now, several methods have been carried out for medical training which bring the benefits for trainee to master the skills and accumulate experiences. However, because of the limits of these methods, the training effectiveness is limited. With the developments of technology, more and more simulators have been launched to...
At small scale, the surface force becomes dominated, which causes difficult to the small object's manipulation. In this paper, we study the effect of the endeffector's contact area on the biological cell's manipulation. First, two endeffectors with different size are fabricated based on focused ion beam (FIB) etching. Then, they are used to detach the single cell from substrate. The maximum detaching...
This paper uses the somatosensory system of Kinect to realize the hand gesture recognition involving action and digit of finger. The hand action is completed by using the NiTE library owning the framework of hand gesture recognition. Taking advantage of the information of the depth map, the digit expressed by hand is recognized by using OpenCV library. The simulated results demonstrate the work is...
In this paper, we present a mechanical design of a conceptual hybrid autonomous underwater vehicle (H-AUV) which combines the features of both a propelled underwater vehicle and those of an underwater glider. We develop its dynamic model and perform several simulations to showcase its locomotive capabilities. The main contribution of the paper is in the proposed motion planning technique to solve...
Dual-arm Underwater Vehicle-Manipulator Systems are able perform a variety of interventions tasks, and there are still many challenges related to making such vehicles autonomous. This paper presents a guidance method for generating reference trajectories for such a system by considering the main manipulator and the vehicle base as a leader unit and the secondary manipulator as a follower unit. The...
We have developed the robotic vehicle on water that moves by the rider's balance. Previously, due to the lack of stability of the vehicle, balancing skill was required for the rider. In general, the center of buoyancy of the floating body influences on the stability. Therefore, in this paper, the floating vehicle was modeled and the appropriate body shape and size that improves the stability was simulated...
A robot accepted by animals as conspecific is a very powerful tool in behavioral biology, particularly in studies of gregarious animals. In this paper we present the first results of acceptance of a robotic fish designed for experiments on collective animal behavior. The robot consists of two modules: a fish lure fixed on a magnetic base and a miniature mobile robot guiding the lure from below the...
In this paper we consider swimming underwater snake robots that are fully immersed in water and moving in a virtual horizontal plane. The main objective of the paper is to develop a model that is well suited for control design and stability analysis for swimming snake robots. The proposed model is notably less complex than the existing models, while significant parameters such as added mass effects,...
Developing soft fish robots by biomimetic approach is a useful way to achieve high efficiency, high performance and fish-like motions. Comparing to the conventional rigid fish robots, the design and control of soft fish robots are difficult, because the coupling between the flexible structure and fluid should be considered. But the coupling problem is very difficult to be solved due to large deformation...
In this paper, a Genetic Algorithm is used to solve for the optimization problem of a quadruped rover, which is developed based on a two-dimensional model of a domestic cat. The rover's gait, pose and control parameters are optimized for two separate objectives. First, the energy consumption through applied joint torque is minimized for fixed thrust speeds. Secondly, the rover's thrust speed is maximized...
Cyclical locomotion, such as walking, hopping and running, is known to be generated at the spinal cord, guiding human and animal strides over different gaits. Over the last years, many researchers concentrated their study on the origin of such signals, replicating them by either controlling joint angles or torques. In this work, we use a quadruped pneumatic robot to reproduce stable walking on a treadmill...
Adaptability of quadruped animals is not solely reached by brain control, but by the interaction between its body, environment, and control. Especially, morphology of the body is supposed to contribute largely to the adaptability. We have tried to understand quadrupedal locomotion by building a bio-inspired quadruped robot named “Pneupard”, which has a feline-like muscular-skeletal structure. In our...
In this paper we analyze characteristics of the ground reaction force (GRF) experienced by the legs of the quadruped robot during stance phase in walk gait, in particular, when the height of center of gravity (COG) of the quadruped robot is changeable. We also build the dynamics model of the quadruped robot. Two dynamics equations during swing phase and stance phase are established, respectively....
Legged locomotion is an open problem in robotics, particularly for non-level surfaces. With decreasing robot size, different issues for climbing mechanisms and their attachment and detachment appear due to the physics of scaling. This paper describes micro-scale phenomena for different adhesion methods that can be employed in microrobots. These adhesion methods are applied to a sub-2 gram legged robot,...
Dexterous distal arm functions are crucial for execution of activities of daily living (ADLs). However, it remains difficult for patients with neurological deficits, such as stroke, to recover the lost manipulation capabilities. In this paper, a modular approach has been proposed to design a wrist-hand manipulator to be employed in the rehabilitation training of the upper limb dexterous function....
This paper presents a novel rehabilitation assistive device called a “parallel link type human ankle rehabilitation assistive device (PHARAD).” It can accurately measure foot motions in six degrees of freedom and reproduce the ankle joint motions. By reproducing the input motions of the ankle joint, PHARAD conducts passive exercises for ankle rehabilitation. To measure and reproduce complex foot motions,...
This paper presents a lower limb rehabilitation robot based on free gait and virtual reality, which is intended to improve therapeutic efficacy. With the help of the robot, patients with motor disabilities can walk with free gait in a virtual environment and choose between passive and active training modes. So the impaired limbs can get appropriate exercise in all clinical stages and the motivation...
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