In this paper, an omni-directional mobile robot with mecanum wheel was designed. Based on mathematical modeling theory and the virtual prototype software called Adams, the mathematical model of mobile robot was built and the kinetic characteristic was simulated. So we can ensure that the mobile robot with mecanum wheel has omni-directional movement characteristic. The reliability of the mathematical model has been verified through the comparision of the the mathematical calculation and simulation result. At the same time a new method was put forward to ensure all the mobile platform wheels can fully contact with the ground when running on the uneven road surface. Then the stability of the motion control system has also been improved.
The compound Fill Sphere Model (cFSM), which is an extension of common Fill Sphere Model, is widely used in real-time haptic interaction with deformable body. Comparing with finite element based model, the simplicity and efficiency are advantages of cFSM. However, determining implicit parameters of cFSM is a difficult task since a vivid deformation should be attained during haptic interaction. In this paper, to improve the simulation precision, parameter matrices of the cFSM are identified through an analytical method for the first time to our best knowledge. After deriving parameter matrices by linearization, the stiffness matrix, damp matrix and mass matrix of the cFSM are obtained by minimizing errors between stiffness matrix of the Finite Element Model (FEM). In order to evaluate the performance of derived parameters, comparative experiment has been conducted between the cFSM and FEM. Additionally, based on the derived parameters, a real-time haptic interactive scenario is constructed to validate the performance of deformation simulation.
A high-power DC motor drive with low electromagnetic interference (EMI) is needed for the nondestructive testing (NDT) robot in the nuclear industry environment. This paper focuses on the test and analysis of EMI for thyristor based DC motor control system, which can work in four quadrants to drive the NDT robot. The experimental tests of EMI are conducted with different factors, such as position, power supply mode, inductance of the smoothing reactor, motor load, and so on. The methods to restrain the EMI are researched and applied in the system. The experiments demonstrate that EMI of the DC motor drive is lower compared with the motor drive using PWM mode, and the drive can fully meet the need of the NDT robot.
An miniature underwater robotic system for hazardous environment has been developed. The system consists of an underwater robot, a robot control station and a cameral control station. The underwater robot is installed two cameras for inspection, one is a camera of radiation resistant with two-freedom PTZ in the front of the robot, and the other is a fixed camera in the back of the robot. A miniature manipulator is equipped under the fore-camera to catch the small parts like bolts and nuts in the pools. The movement of the underwater robot is controlled by the master control station and the cameral control station controls the rotation and focus of the fore-camera. Besides, the underwater robot is equipped with the sensors, as MEMS inertial measurement unit, magnetometers, side scan sonar, water-depth gauges, which are integrated to determine the orientation and location of the robot. Meanwhile the navigation information is displayed in the virtual environment, which is modeled upon the real pools of the nuclear power plant. The underwater robotic system is easy to operate and will be applied to the hazardous environment like nuclear environment in future.
In this paper, a new redundant degree-of-freedom wearable haptic device is developed and presented, which combines the advantages of the arm exoskeleton and the desktop haptic device. The haptic device has capabilities of large working space and high stiffness, the design of the wearable can reduce operators’ fatigue and increase the comfort of the operation. This paper also includes the analysis of workspace based on the kinematic analysis. Dynamics model of the haptic device has been established to get the torques of the driven motors of every joint. Lately, the virtual prototype model was established in ADAMS to get the simulations results, which lays the foundation for further force-feedback experiments.
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