Applied Mechanics and Materials Vols. 236-237

Abstract: Association rules tell us interesting relationships between different items in transaction database. But traditional association rule has two disadvantages. Firstly it assumes every two items have same significance in database, which is unreasonable in many real applications and usually leads to incorrect results. On the other hand, traditional association rule representation contains too much redundancy which makes it difficult to be mined and used. This paper addresses the problem of mining weighted concise association rules based on closed itemsets under weighted support-significant framework, in which each item with different significance is assigned different weight. Through exploiting specific technique, the proposed algorithm can mine all weighted concise association rules while duplicate weighted itemset search space is pruned. As illustrated in experiments, the proposed method leads to good results and achieves good performance.

Abstract: Profibus-DP fieldbus has been the research focus in the field of industrial automation and control, and there’re kinds of relevant products. The slave station, one of the products used in connecting the master station and the industrial units like frequency converter, sensor and meter and so on, is the key technology now researched. A design of Profibus-DP slave station based on DPRAM is proposed in this paper. First, a overall design of hardware for the slave station is showed. Then, the design for the core module of the slave station and the user interface are mainly expounded. In the end, the design of the software for the slave station is proposed, and the connection between the industrial units and the Profibus-DP master station is realized.

Abstract: The establishment of intelligent warehouse improves the efficiency of the items storage and realizes the localization and tracking of the various elements of the warehouse. Users can dynamically monitor the location and whereabouts of material, operating machinery and vehicles in warehouse by intelligent terminal. The overall architecture of the intelligent warehouse is built on the Internet and the Internet of Things.With the use of RFID technology, the wireless sensor network technology, the short-range wireless communication technology and automatic identification technology to locate and track the various elements of the warehouse for making warehouse management automatic, intelligent and accurate. The paper first analyzes the basic architecture of the intelligent warehouse system and designs the network architecture of the intelligent warehouse. It also compares the real-time location tracking system based on the RFID with the one based on wireless sensor networks. Therefore it can develop improved method of intelligent location tracking system and apply 8421 coding techniques in the localization and tracking of the intelligent warehouse so as to obtain a satisfactory effect of static and dynamic positioning.

Abstract: To improve the timing related performance of the embedded software of automotive control system, a performance modeling language has been developed based on UML (Unified Modeling Language) using meta-modeling technique. The proposed language consists of three kinds of meta-models used to define the high-level modeling paradigms for software structure, target platform and runtime system respectively. The modeling environment configured by the proposed language and software modules of functional model importation, components allocation, task forming and timing analysis can reuse the existing functional models, add timing requirement as well as resource constraints, and fulfill formal timing analysis at an early design stage. As results, the reliability of the automotive embedded control software can be improved and the development cycle and cost can also be reduced.

Abstract: With consideration of the actual requirement of fault knowledge management in current aviation maintenance, ontology-based knowledge representation method of aircraft fault is studied. Knowledge sources of aircraft fault ontology are analyzed based on ontology modeling primitives. Ontology construction method of aircraft fault knowledge is proposed learning from software engineering and the essence of the existing ontology construction methodology. On the basis of the above study, aircraft fault ontology which is consist of Fault Core sub-ontology, Product domain sub-ontology, Case domain sub-ontology, and Diagnosis domain sub-ontology is build, and it represents aircraft fault knowledge completely and consistently, and also lays the foundation for knowledge management of aircraft fault.

Abstract: Multivariable system with time delay and coupling widely exist in industrial which may destroy the normal work of control system. An unconventional internal model controller design method will be introduced in this paper. The closed loop system can be decouple by calculate the inverse of transfer function matrix and the optimal diagonal decomposition matrix. Finally, this method was applied in a multivariable system with different time delays, the simulation results can show the effectiveness of this method.

Abstract: Rendering intent is one of the key elements of color management, which has a great influence on image reproduction. Matching principles of four kinds of rendering intents in ICC are elaborated. Based on the color management workflow of ICC, the chromaticity of the color patches are measured with the spectrophotometer. And then the color difference and color gamut volume of the color patches are calculated and analyzed. The experimental results play an instructive role in the choice of rendering intents and the implementation of the color management.

Abstract: Combining domestic and foreign literature, the technology of flight attitude testing technology was summarized. The research process of this field includes independently inertial measurement unit and inertial navigation system. The previous stage is the test technology only depend on one kind of navigation equipment, such as Gyro, accelerometer or electromagnetic sensors etc, the latter means various combinations of measurement units, on the basis of complementary advantages in performance to improve testing accuracy each other. Based on the testing technology was analyzed and compared, configuration, merit and demerits of multi accelerometer were discussed. The future development of this technology was prospected finally.

Abstract: The lightly damped resonant poles of flexible system increased norm of coprime factor perturbation, which reduced robust of system after loop shaping design. This paper proposes approaches considering the performance of constraints, to select performance weight function through disturbance attenuation and to adjust the complementary sensitivity weight function through design index. The flexible satellite's attitude control demonstrates that the two approaches are able to rapidly select weight function under ensuring the system's robust and have the ability to depress disturbance.

Abstract: Considering inaccurate model and simplified calculation problems of the hypersonic reentry vehicle, this paper presents an adaptive fuzzy control system of the trajectory tracking control method. Firstly we introduced the principle of fuzzy system, then used fuzzy control theory to approximate the second-order drag acceleration model and got drag model by fuzzy identification, finally designed the adaptive controller. The simulation results show that the fuzzy adaptive tracking control method don’t depend on the dynamic model, but only rely on drag of the vehicle suffered, it can be measured directly or obtained by the aerodynamic model of the flight, the can generate tracking guidance control law, and the fuzzy adaptive tracking control method enables hypersonic vehicle to track the drag reference trajectory, realizes safe reentry and the terminal states can meet the requirements of the terminal constraints with high precision.