Applied Mechanics and Materials Vols. 490-491

Abstract: Energy saving and environmental protection become two major topics in today's world. But with the rapid development of the global auto industry, energy consumption and environmental pollution problems also arise, so how to develop electric vehicles, especially how to promote the sustainable development of the electric car has become the outstanding problem faced by automotive industry in China. Motor drive system is the core component of the electric car, so it's extremely important to drive motor selection [. This paper mainly introduces the characteristics and performance of all kinds of drive motor, and determine the type of logistics in electric vehicle drive motor and the selection of drive position.

Abstract: This article is in view of the linear motor aspects of application development in the field of electric machine tool equipment technical requirements analysis, linear motor with its high speed and high acceleration transmission has been in processing center, CNC milling machine, lathe, grinding machine, compound machine, laser is widely used in machine tools and heavy machine tool, in the aerospace, automotive, mold, energy, general machinery in areas such as plays a special role. Linear motor has precise control test system, reasonable matching of the technical indicators, to make it on the electric machine driven by linear motor can realize stable precision mobile and linear motor used for electric spark machine tool is another innovative application achievement of the modern advanced manufacturing industry. Domestic electric machine mostly adopts five axis NC gear rack drive control system, using the linear motor drive control system was still in the stage of research, to promote the linear motor is widely used in the field of electric machine, and the demand analysis.

Abstract: A vibration control method is proposed to suppress nonlinear large vibration of the flexible robotic arm undergoing rigid motion. The method takes advantage of modal interaction and is implemented based on internal resonance. To attenuate vibration of the flexible arm, another vibrating system, consisting of a rigid link, a flexible joint and a damper, is introduced as a vibration absorber. Perturbation technique is used to study the transient response of the nonlinear equations of motion. Numerical simulation results preliminarily verify that the proposed control strategy is able to effectively reduce vibration of the flexible robotic arm.

Abstract: Nowadays CCTV surveillance system can be seen everywhere in our cities^[. The limited monitoring range is the main problem for its application. Although some of the monitoring unit bracket allows the camera to search within a certain range, its huge size severely limits its use in some conditions. For example, it is not appropriate to apply in a small space^[. Considering this, we design a small space rotating device which can make the camera rotate around the X and Y about 40 degrees respectively. Experiments show that the CCTV rotation bracket has its features such as compact, light weighted structure and easy to control. It is suitable for application on the small size device.

Abstract: In this paper parametric identification algorithms are applied to estimate dynamic parameters of a space manipulator, whose model is described through the Dynamically Equivalent Manipulator approach. Gradient and least-square methods are applied in order to evaluate capability of the schemes. A sufficiently rich input signal is applied as reference trajectory for joints position, while a simple model-based PID computed torque control scheme is responsible for keeping the trajectory tracking. Simulation results for a two degree-of-freedom space manipulator have shown the effectiveness of the proposal.

Abstract: Our goal is to improve the coverage of an area using robots with simple sensors and simple, robust algorithms usable for any kind of room. We investigate the advantage of the swarm - compared to a single robot - and three different algorithms for the task of searching landmarks in a previously unknown area. The guidance of the robot is based on landmarks, implemented by RFID tags irregularly placed in the room. The experiments are conducted using a custom made simulator of RFID-equipped Roomba cleaning robots, based on our previous work with real-life Roomba swarms. We show that for the simple room coverage algorithms the speedup gained from increasing the size of the swarm diminishes as the swarm grows and most importantly, for larger swarm sizes the information available and the intelligence of the algorithm becomes less important.

Abstract: An autonomous mobile robot in a human living space should be able to not only realize collision-free motion but also give way to humans depending on the situation. Although various reactive obstacle avoidance methods have been proposed, it is difficult to achieve such motion. On the other hand, 3D X-Y-T space path planning, which takes into account the motion of both the robot and the human in a look-ahead time horizon, is effective. This paper proposes a real-time obstacle avoidance method for an autonomous mobile robot that considers the robots dynamic constraints, the personal space, and human directional area based on grid-based 3D X-Y-T space path planning. The proposed method generates collision-free motion in which the robot can yield to humans. To verify the effectiveness of the proposed method, various experiments in which the humans position and velocity were estimated using laser range finders were carried out.

Abstract: It is important to research and develop the mobile robot control system for the mobile robot navigation in unknown environment control theory and method of study; and there are rich environment perception ability, independent dynamic decision-making and planning, behavior control and execution and other functions in one mobile robot. In order to achieve good results, the choice of methods for obstacle avoidance is vital for obstacle avoidance problem which is an important branch of robot technology. This paper base on visual sensor that has the characteristics of high sensitivity, wide dynamic range and infrared distance detection with high efficiency, accurate, and other advantages , and propose introduction two kinds of obstacle avoidance strategy of sensor fusion technology, And take the behavior control method to be added, on the basis of the robot's obstacle avoidance for the further research.

Abstract: Implementation of robotic service is needed extremely enormous of information including environment, place, user and object knowledge. It is extremely difficult for a robot to do tasks ordered by a human without having some basic knowledge or information. This paper proposes a method to create object knowledge focusing on an object and objects place relationship for the robotic service namely tidy-up service, in which a robot is asked to take objects such as books, cups, dishes on a table to appropriate places automatically. In details, as the first phase, we conduct a questionnaire to collect the trajectories in term of places of individual object from the participants. Based on the collected object trajectory information, we are able to build Markov chain model of the object which the states are possible places and transition probabilities are the probability that the object moved from one place to other places. In final, we are able to use the transition probability including the Markov chain model to predict and provide the next appropriate place. The result showed that the proposed approach is efficient in creating object trajectory as knowledge, hence, helping the robots to and to provide intuitive service.

Abstract: Medical Tele-diagnosis Robot (MTR) is a cost effective telemedicine mobile robot that provides tele-presence capability for the specialist on a remote location to virtually meet the patient, perform diagnostics and consult the resident doctor regarding the patient via internet. This paper highlights on the development of a doctor-robot interface where the doctor or user can control the robot reliably via regular internet connection from a different location, a distributed secured network for MTRs communication, an audiovisual communication system for tele-diagnosis and a navigation safety system called Danger Monitoring System (DMS) as part of MTRs assistive internet based navigation remote control system. The overall setup and maintenance cost of MTR is reduced by adopting a decentralized network via hybrid P2P technology. With this, the network load is distributed among the users. As for the audiovisual system, the timeliness of the video transmission from the robot to the operator can be attained by CUDA H.264 video encoding to reduce the size of the video stream and by taking advantage of the highly-parallel processors in the graphics processing unit. Combinations of sensors are place around the robot to provide data on the robots surrounding during operation. The sensors data are fed into the DMS algorithm which is equipped with fuzzy logic based artificial intelligence system to process the data from all the sensors and user input to decide preventative measures to avoid any danger to humans and the robot in terms of obstacle avoidance and robot tilt angle safety. The overall system is tested by a set of experiments and found to be demonstrating an acceptable performance. This system proved to be suitable to be used in MTR.