Hua Long Xie

Job shop dynamic scheduling model based on multi-agent

The characteristics of static and dynamic job shop scheduling are discussed. And also analyzes the concept and action of multi-agent system. Bring forward and built a job shop scheduling model based on multi-agent in order to accommodate the changes created in the production process. The job shop production scheduling model and dynamic scheduling model are presented In the model, the entities in the job shop are abstracted as manager agent, task agent and resource agent with multi-agent technology. According to contract net protocol (CNP), agents cooperate with each other through contract net and the process of inviting public bidding makes for completing the production order and dynamic scheduling.

STEP-Compliant NC Simulation System Modeling

Although some research and commercial software for NC simulation is available, NC simulation modeling is still not matured. Most of them are based on G&M code. STEP-NC is a new data model for computer numerical control (CNC). It provides rich information for CNC machine tools, i.e. “what to do” based on features rather than “how to do” as for G-code. IDEF0 is a method designed to model the decisions, actions, and activities of an organization or system. It helps to organize and analyze a system and to promote a good communications between the analyst and the customer. So in this paper, from the view of system modeling, function modeling of NC simulation system based on STEP-NC is built by IDEF0 method. As a result, NC simulation system can be realized more efficiently.

Intelligent Control of BRHL Based on MR Damper

Biped robot with heterogeneous legs (BRHL) is a new pattern humanoid robot. This paper first introduces the conception, research purpose and configuration of HRHL. Then coordinated dynamics model and magneto-rheological (MR) damper model are given. In the end, this paper discusses the control model of BRHL and gives combined control simulation. The result indicates that intelligent bionic leg controlled by MR damper can track artificial leg’s gait well.

Modelling and analyses of WSN-based pursuit-evasion strategies for multi-pursuers to multi-evaders

Wireless sensor networks have yielded a lot of new theoretical problems for the localisation, tracking and navigation control of mobile objects within a local area, especially, for investigations of pursuit-evasion games. For the efficiency of capture and evasion of pursuers and evaders in pursuit-evasion games, several novel pursuit-evasion policies are proposed in this study. The vector-ward evasion strategy may bring the evader breaking away from the puzzledom between two fires and reduce fluctuation of evasion routes. The intelligent collaboration pursuit strategy effectively exerts the collaboration efficiency of multiple pursuers and shortens the capture time. The estimated location errors caused by wireless sensor networks were also involved for the pursuers and evaders in the simulation of this study. The results show that every pursuit-evasion strategy is valid and robust. In the simulation of multiple pursuers to capture multiple evaders, the object assignment method and the corresponding pursuit policies are reliable and can capture all evaders in a limited area as quickly as possible.

The Study of Product Configuration Information Model and Repository

Product configuration design model is established on the basis of the base type product of standardization, seriation. According to the needs of customers, This paper arranges the physical and functional structure of the product, and sets up configuration model of the whole model. Through the analysis and configuration design, provides the final product to meet customer requirements. In this article, introduces the mix of configuration design knowledge representation methods, so as to adapt to the requirements of different types of product design.

Virtual Prototype Modeling of Biped Robot with Heterogeneous Legs

Biped robot with heterogeneous legs (BRHL) can simulate amputees dressed with intelligent above/knee (A/K) prosthesis and can be used to evaluate intelligent prosthesis (IP) performance. First the concept of virtual prototype technology and BRHL is introduced. Then virtual prototypes of BRHL mechanical system, ground environment, perception and control system are established. In the end, the continuously walking simulation of BRHL based on virtual prototype is done. The research indicates that virtual prototype modeling based on Pro/E, ADAMS and MATLAB/Simulink is feasible.

The Spindle Static Characteristic Analysis of HTC3250µn NC Machine Tool

The analysis of spindle static stiffness is particularly important. The concept of spindle stiffness is introduced. Based on software ANSYS, the finite element analysis model of simplified spindle is established. Two equivalent forms of bearings are discussed and the analysis results are compared. The stress distribution nephogram of spindle is given. The research indicates that using spring-damper element instead of bearings is more suitable and the machining accuracy mainly depends on the stiffness rather than strength.

Product Configuration Knowledge Modeling Using Extend Object Model

This paper presents an extended object model for case-based reasoning in product configuration design. In the extended object model a few of methods of knowledge expression are adopted such as constraints, rules, objects etc. On the basis of extended object model, case representation model for case-based reasoning is applied to product configuration design system. The product configuration knowledge can be represented by the extended object. The model can support all the processes of case-based reasoning in product configuration design such as case representation, indexing, retrieving and case revising. The model extends traditional object-oriented model by including the relationship class used to express the relation between the cases, constraints class used in the product configuration knowledge representation, index class used in case retrieving, solution class used in case revise. So the product configuration knowledge that used in the product configuration design can be represented by using this model. In the end a Metering pump product configuration design systems is developed on the basis of the proposed product configuration model to support customized products.

Performance Analysis of Spindle System of NC Machine Tools

The performance of spindle system of machine tools directly affects the characters of machine tools. The static and dynamic stiffness of spindle system is one of the main factors that affect the machining precision of machine tools and the performance analysis of spindle system occupies an important position in the design of machine tools. Based on ANSYS, this paper analyzed static stiffness, vibration characters and harmonic response of spindle system of SSCK63-400-typed CNC lathe. Selecting improving the characters and saving the cost of spindle as optimization object and using APDL of ANSYS, the optimization of the spindle is completed by the optimization tools of ANSYS. This research provided the basis for statics and dynamics design of spindle system, shortened the design period and improved the design efficiency.

Localization and Control System of Mobile Robot Based on Wireless Sensor Network

The localization of mobile robots is one of important problems for navigation of mobile robots. The wireless sensor network, i.e., Cricket wireless localization technology, was used to obtain motive condition of mobile objects in this study. The information transmission between the Cricket localization system and mobile robot system was achieved for localization, navigation and control of the mobile object. The errors of localization sampling data of the Cricket localization system vary within 3cm in a static condition. The Cricket localization system can meet the navigation requirement of the mobile robots.