Materials Science Forum Vols. 697-698

Abstract: A new strip shaper is developed to avoid the scratch of the strip surface due to different thermal expansion of the traditional detection roller measuring unit effectively. The signal transmission form which is different form the international popular dry slip ring is put forward; the spray wet slip ring is developed to improve the measuring precision and the service life. The signal processing form which is different form the international popular gathering card is put forward and the embedded DSP shape signal processing hardware system is developed to improve the measuring precision and the anti-interference ability. The shape signal processing software system whose function contains error compensation, pattern recognition, establishment of the target shape and the close-loop control calculation is built to implement the intelligentized shape meter. The shape meter has been test chronically on the 1250 mm cold strip mill of Angang Steel Company Limited and the test result indicates that the measuring signal is stable and reliable and the closed-loop control of shape is implemented.

Abstract: Increasingly, induction heaters are being widely applied to the energy-saving light industrial equipment. But their electromagnetic radiation’s impact on the environment can’t be ignored. In the paper, several medium frequency induction heaters had been studied under different experimental conditions using E61 electromagnetic field strength analyzer, and as its supplement, the racetrack-coils induction heater had been simulated using ANSYS. According to ICNIRP guidelines, the results show that their radiation is generally in critical state, and magnetic field strength is superstandard in some areas. And countermeasures to the problems are advised.

Abstract: This paper presents a nonlinear model of the pulse width modulated(PWM) pneumatic servo systems with long transmission lines which has a huge potential to be used in the automatic production lines and other industrial applications, for the advantages of low cost and clean. An averaging approach is adopted to describe the equivalent continuous-time dynamics of a PWM controlled nonlinear system. With this model, the simulation is taken with a fuzzy logic controller. The simulation results indicate that the PWM pneumatic servo system with long lines have good performance both in the position control and tracking ability.

Abstract: Critical chain method (CCM) is a new project method which combines project network technologies and management arts. Although there are lots of researches on it, the existing critical chain method has some drawbacks limiting its decision level in practical application. To improve the decision level and application range of critical chain method, the critical chain method with multi-mode is studied. The project network technology is the foundation of project scheduling problem. All the existing project management tools can only support single mode project network, that is, all the project activities have only one executive mode. We study the multi-mode project network as the foundation of multi-mode CC. Furthermore, by relating multi-mode project network to critical chain method, the critical chain method with multi-mode is presented, and the implementation procedure is proposed. In the implementation of multi-mode CCM, the activity priority rules and mode priority rules are investigated.

Abstract: Applying the computer digital simulation program on the basis of numeric integration and the dynamic structural diagram, an improved method was put forward to the problem of PID control in the speed-varying feeding system, and the computer simulation experiment has been done for research.

Abstract: To save the labor cost, industry robot is applied in production line. This paper deals with the design of the beverage packaging line using high speed robots, which will be applied in Hangzhou Wahaha Group Co., Ltd. to satisfy their requirement. On the basis of investigation of the previous line, the packaging process is briefly addressed. Taking into account the circumstance of the workshop area, the layout of the packaging line is proposed. With Petri net technology, the model of the beverage packaging line is built and by analyzing the model, it is proved that the whole system is reachable, bounded and reversible. In addition, the Petri net model builds the theoretical basis for the network control of the whole packaging line.

Abstract: In order to solve the digitalized management problem of aero-engine in the whole lifecycle, a framework of aero-engine AMRO supporting system is put forward. Management of assembly, maintenance, repair and overhaul are involved. Modeling and integration of aero-engine status data, assembly process management, on-spot operation guide, online education support, integration and synchronization of data and fault diagnosis support are regarded as key enabling technologies and studied deeply. Correspondent solutions are given respectively. The assembly digitalization sub-system and the IETM sub-system are developed to validate the proposed system. And close-loop controlling of single aero-engine information is achieved, and the study provides technology support for improving level of aero-engine status digitalized management.

Abstract: Through the analysis of typical aero-engine fault, the function parameters under different throttle openings of the aero-engine are presented, and the fault characteristic learning as the training set are studied using the RBF neural network. An aero-engine function evaluation model is proposed in this work by comparing the test set with the expected value of the training set, and the decay degree of engine function are determined. The proposed method is validated to be an effective method of diagnosing and identifying the aero-engine fault accurately and timely by testing large amount of recorded flight data from each of various types of aero-engines. It makes it possible for early and successful diagnosis and prediction of the health condition of aero-engines.

Abstract: Estimation of tool condition has very important meaning to improve the product quality, continuous machining ability and reliability of the manufacturing system. Based on mathematical morphology, a systematic approach is developed to implement online estimation of tool wear in this paper. As the nonlinear filter, morphological filter is selected to reduce the higher frequency noises before feature values extraction. The feature vector consists of original characteristics of vibration signal and cutting force signal. Then, they are input into SVM for training and testing. Experiments show that this method can achieve tool wear estimation effectively.

Abstract: The aim of the paper is to present a conceptual exploration on how a newly emerged distribution service business in China is developed, interpreted and modelled. The study draws on a recent case from a fast expanding 3PL company in China and frames the case with a conceptual flow-model and interprets it mathematically by using a linear bi-level programming algorism. It finds that recent advances in the steel bar logistics practices in China have been phenomenal. The emerging business model is set to define the standard for the industrial sector. The logistics process and structure changes were primarily driven by not only the higher returns on investment to the participating members individually, but also by that of the total supply chain. The emerged steel bar logistics service model studied here represents a new business evolution in the 3PL service industry ever seen in China. The application of bi-level programming algorithm in assessing returns on investment and the total supply chain value has been original.