Research on Open Numerical Control System Based on Collaborative Design and Development

Regarding to the requirement of machine tool state monitoring in the functional diversity of CNC system, the prototype of an open CNC system based on embedded monitoring unit is studied and constructed. According to the analyzing of the development status of machine tool state monitoring, an embedded monitoring unit model, which connects with the CNC system through the field bus and can be reconfigured when the monitoring target changed, is set up with the ARM + DSP master-slave architecture, through which the state of machine tools can be accessed by the CNC system. In view of the development trend of open CNC system, a four-layer open architecture reference model is proposed, which will meet the demand for structure adjustment and function expansion. In addition, the key supporting technologies in the system design are also researched, so as to provide a feasible solution for the maintenance and multifunction integration of CNC equipment.

The characteristics and applications of the system for welding machines based on SCM , based on PLC control system and PC-based industrial control system was introduced. It has certain significance to the design of welding machine control system.

Nowadays, the functional requirements of embedded systems increase rapidly. CNC systems are also influenced by this trend. In order to solve the growing complexity of CNC systems, open CNC system is considered as a key technology to take on these challenges. Reconfigurable CNC system is an open CNC which allows modifying system software in response to changing market demands or technologies. This paper presents a component model and layered system architecture for reconfigurable CNC systems, which addresses the functional and non-functional requirements of CNC. The proposed model improves the reusability of system software and facilitates software updating. The layered architecture also helps to reduce the run-time overhead, achieve the property of loose coupling and facilitate the implementation of some advanced functions. In order to verify our design, some experiments are carried out.

Traditional interface closure CNC system makes functional expansion and architecture alteration impossible. It cannot meet the developing demand of modern technology toward openness, flexibility, and intelligence. In this paper, a Multi-agent technology is utilized for open CNC design, the CNC can be regarded as a double-layer structure, the upper layer concludes software modules running tasks without real time requirement which coordinated by Windows Operating System on general PC hardware, the bottom layer is composed of several embedded controllers implementing real time tasks with Real time Operating System (RTOS) and connecting to a high speed field bus. All the software modules and embedded controllers can be easily converted to Multi-Agent System (MAS) by endow them with the concepts and characteristics of intelligent agent. Taking the advantage of agent's characteristics like self-determination, adaptability and cooperation ability, it becomes easier to develop an open, reconfigurable and intelligent CNC system. Finally, the 5-axis milling machine tool SK-5L16075 is utilized to demonstrate the feasibility of the proposed system.

One reason for the delay of open-architecture control system in industry action is that no clear and hierarchical design method has evolved. Different application environment and object should have different open levels, applying platforms, system architectures and integration method. Abstract open control concepts or characters must be converted into specific and practical applying objects and contents of one designing of open-architecture CNC system. Then through analysis of the hierarchy or level of system open character, practical system functional objects to be realized, technical and non-technical issues to be considered, implementation contents and process and the method of component and system validation, a hierarchical design method of open modular architecture CNC system is established.

Aiming at the difficulty of synchronization of gantry platform in the process of movement, a method using open CNC system for four-motor drive control based on real-time Ethernet is proposed. Firstly, the structure of four-motor driven gantry platform is given. Then the architecture of the open CNC system and real-time Ethernet is designed for control the gantry platform. Finally, the interpolation operation of CNC system is separated to improve control frequency and accuracy. The processing result of the specimen shows that the proposed control strategy can achieve good synchronization effect.

Based on PMAC open CNC system, which features an open secondary development of space left to the designer. This topic has developed a set of application and secondary development of the NC system experimental platform, that is, IPC (industrial computer) machine + PMAC structure of open CNC system. This issue focuses on the overall structure of the numerical control system software design and the function module design and development process.

With the development of industrial automation, people are increasingly demanding high product quality. Especially in automotive and aerospace fields, the fatigue quality of components determines the merits of the whole vehicle. Therefore fatigue performance testing has good prospects. Pressure pulse testing rig is a automatic control system. The system uses the solution which combines the virtual instrument technology with PLC controller technology. It has the ability to get the function of signal acquisition, signal analyzing, data processing and automatic control together. It enables the system to run automatically in accordance with setting commands and avoids the problem that the CNC system lacks of real-time capability and the disadvantage that the whole PLC driver control system can not meet the requirement of data acquisition and data processing. At the same time, it has both the advantages in the open CNC system and advantages in the controller system and can realize the highly efficient control.

Multi-degree of freedom robust control of the CNC X-Y table PMSM-based feed-drive module The paper presents results of studies on linear synchronous motors controlled in CNC feed axes through an intelligent digital servodrive. The research includes a conceptual design of an open servodrive control system and identification of dynamic models of a test stand with an open CNC system. Advantages of robust control over the classic one are discussed. A hybrid predictive approach to robust control of milling machine X-Y table velocity is proposed and results of simulation tests are presented. was prepared during the work for the Ministry of Science and Higher Education grant number N N502 336936, (acronym for this project is M.A.R.I.N.E. multivariable hybrid ModulAR motIon coNtrollEr), while its main purpose is the development of new robust position/velocity model-based control system, as well as to introduce the measurement of the actual state into the switching algorithm between the locally synthesized controllers. Such switching increases the overall robustness of the machine tool feed-drive module. The paper is the extended version of material proposed in [10].

Using the advantage of polynomial spline interpolation to represent spatial curves with good approximation effect and mature technology, an instruction format with polynomial spline curves, which is suitability for five axes coordinated real-time interpolation, is presented against the current five axes coordinated linear interpolation method with drawbacks of low-speed, low-accuracy and great NC files in sculptured surface machining. Structure of the controller of an open CNC system developed by ourselves is introduced. And the method to realize the interpolation in translator and interpolator is further discussed detailedly. Through the illustration, it has been indicated that the proposed method can avoid all the shortages of five-axis linear interpolation method. The preliminary application results show that the said technology has a better suitability.

R2P: an Open Source Modular Architecture for Rapid Prototyping of Robotics Applications

Firstly, by analyzing the demand of electronic information system capabilities in complex battlefield environment, a distributed heterogeneous general signal processing platform architecture is designed. It focuses on the overall structure and composition, hardware architecture and software architecture. The platform adopts open system architecture, which can realize the decoupling of functional software and hardware platform, task mode and implementation. Secondly, technology implementation approach is discussed in three respects, including resource virtualization management, parallel scheduling and real-time interconnection in heterogeneous environments, and autonomous mission planning. Finally, the characteristics of the architecture are summarized.

The integration of service function chains (SFCs) and unmanned aerial vehicles (UAVs) lays a crucial technological foundation for achieving efficient, reliable, and adaptive future airborne service networks. Service functions (SFs) in the SFC will be deployed on UAVs; this type of SFC is called unmanned aerial vehicle-based service function chains (USFCs). However, due to the combined effects of open hardware and software architectures, exposed communication links, and complex mission environments, UAVs have become ideal targets for attackers. Once a vulnerability is successfully injected into a UAV, data from the SFs running on it will be stolen, seriously threatening the dependability of the USFC. Therefore, it is necessary to conduct a quantitative evaluation of the USFC dependability to provide insights for further improving its dependability. This paper develops a USFC dependability evaluation model based on a semi-Markov process (SMP) to capture the dynamic interaction between attacker behavior and USFC system recovery behavior. The dependability of the USFC is comprehensively evaluated from two perspectives: availability and security. Extensive numerical analysis experiments are conducted, and the results not only demonstrate the changing trends of various dependability metrics under different parameters but also show parameter combinations for synergistic optimization among metrics.

An architecture which seamlessly integrates multiple audio decoders onto a single DSP is presented. A new concept in the form of an open software architecture is implemented which allows third party owned intellectual property in the form of specialized software modules to coexist as value-added post decoder processing phases. This modular software architecture maintains flexibility and adaptability for future decoder and post processing integration. The means by which this architecture supports post processing functions across decoders is the focus of this paper.

RM-ODP (Reference Model of Open Distributed Processing) is a reference model for open information processing systems. Conformance is one of the key aspects of open systems. Conformance ensures the interworking in a multi-vendor information processing environment that may evolve over the time. An essential partitioning concept for open system is that of reference points (RPs). RPs consist of a set of interfaces together with potential interactions at these interfaces. RP specifications define conformance requirements, so that they can be used to determine the conformance of a system. However, the testing of RPs of real systems is restricted as their functionality is often very complex. Refinement of the RP structure is required to ease both their realization and also their testability. In particular, the incremental development of RPs that allows both the evolution of the system architecture and the step-by-step implementation by vendors should be supported. A new concept — that of an RP-facet — has been recently defined to structure RPs and to improve their testability. The focus of this paper is on structuring principles and dependence relations used by the RP-facet concept. They serve as a basis for incremental and efficient testing at RPs. An example taken from use scenarios on service access in open systems is elaborated in the paper.