Abstract: From the viewpoint of the forming principle of spiral curve and classification from the kinematics, established relatively unified mathematical model of spiral curve based on the movement characteristics of particle and the forming principle of space surface shape, and in turn relying on relatively unified mathematical model of spiral curve, combined the similarity of forming movement between spiral curve and spiral surface, derived the relatively unified mathematical model of spiral surface with the concept of sequence of operator presented for the first time. The relatively unified mathematical model has been validated that it not only expressed the relationship of movement synthesis for commonly spiral surface’s forming movement, but also depicted new spiral surface to be required or named through changing parameters.
Abstract: Aimed at building up the virtual assembly for the mechanical system for applications in workshop, with fundamental component lib made by PRO/E modules. Principle of the virtual assembly on PRO/E and topological relationship was put forward and employed for the system as the base. Detailed constraint relations and topological relation were researched in Cartesian coordinate system for guiding wheel consisting of eleven main components. Virtual testing for the assembly quality was provided with the tolerance and fit features of the mating surfaces.
Abstract: By establishing the architecture of a NC machine tool modular design system that consists of a user interface layer, an application tools layer, and a supporting technology layer, and aiming at the enterprise’s need of repeatedly FEA for product modules, a CAE analysis of information model for machine tool module which consists of geometric information, material information, boundary constraints information, load information and so on was proposed. Knowledge representation of CAE template based on five elements set structure was created, and a method for creating CAE template based on the CAE analysis of information model and CAE system operation was discussed. With the help of this technology achieved a good reuse of the CAE analysis knowledge and process based on the modular machine design technology, which is conducive for enterprises to promote the use of CAE software system and improve the quality of product design.
Abstract: In order to improve the stability and reliability of the logistics handling robots, some optical fiber sensors were used to achieve the automatic navigation and tracking of AGV (Automatic Guided Vehicle) in this paper, and its key technology were also investigated. On the basis of adopting colored ribbon as tracking path, the layout of optical fiber sensors array is designed, and then a control algorithm based on MCU was presented for AGV. Finally, the practicality and effectiveness of intelligent tracing control technology were discussed, respectively.
Abstract: CNC lathe spindle box is a key component of the CNC lathe system, and its dynamic characteristics are the main factor affecting the machining accuracy and processing efficiency of machine tools. In this paper, CK61125 CNC lathe spindle box model was established by simplifying its structure. Then modal analysis of the spindle box was done and extended to 6-order modes with the platform of co-simulation environment in ANSYS Workbench, and the natural frequencies and vibration modes for lathe spindle box were obtained. The weak links in the spindle box were found, and the improvement schemes are proposed. Finally the lathe spindle box was improved, the modal analysis of the spindle box was made again, and the results showed that the lathe spindle box dynamic performance was improved. All of these results are beneficial for optimization and re-design of the lathe spindle box so that it has better dynamic performance.
Abstract: The cone angle effect of CBCT system and affecting reconstructing slice are discussed. The CC-FDK algorithm is introduced. The redundancy data is not disposed accurately in FDK algorithm. The thesis puts forward a weighting projection method based on cone angle and distance to center plane. The method compensates the information of projection unused in FDK algorithm. The simulation model is scanned and reconstructed. The result indicates that this method can extend the cone angle of scanning.
Abstract: To solve the problems that the thermal deformation of the High-Grade CNC machine tool has much effect on accuracy and quality of the produces, the structure characteristics of the high speed motorized spindle is firstly introduced in this paper. Then one type of motorized spindle and supporting structure are selected, and the thermal boundary parameters are calculated. Much more the static and transient temperature field are simulated by using FEA software ANSYS in one working condition. At last, the main measures to improve the uneven temperature field and the plans to reduce the thermal deformation are put forward, which are provided some technical bases for the equipment to achieve the high-speed and high-precision machining.
Abstract: In this paper, in order to help the growing number of elderly do away with the difficulty getting about, a walk-assistant robot for the elderly was designed with tactile and sliding senses that can perceive the movement intention and state of the elderly. And then, its key component, namely detection system of tactile and sliding sensor is designed in detail, including the layout of basic unit selection design of tactile and sliding sensor and the data acquisition system. In the end, a single channel experimental platform is built. The tactile and sliding senses of the elderly are detected and analyzed, and the design of detection system has been preliminarily verified effective. The results show the designed tactile and sliding senses detection system has the function to recognize the intention and state of the elderly movement.
Abstract: The robot vision technology designed to help the elderly and the disabled people are studied on a mobile robot in the thesis, and its robot vision system based on ARM and DSP is mainly designed, respectively. After hardware construction and software design, the experiments are taken to verify the feasibility of the application of the robot vision technology on the age and disabled helping robot.