Applied Mechanics and Materials Vols. 130-134

Abstract: Focusing on representation of quality characteristics variation in product process control, a measurement method based on medium logic was established. Representation model of quality detection index variation in process control was put forward, and fuzziness measurement of quality detection index was improved. Tack monitoring and maintenance of production line were researched by analyzing the variation of product quality index with disturbance. Furthermore, computer simulation was carried out by which influence of controllable variables on product quality with disturbance was analyzed and by which the efficiency of model built above was supported.

Abstract: This article introduces the way Arithmetic Mean Filtering, Weighted Mean Filtering and Inertia Filtering are applied in dealing with analog signals in PLC control system. Apart from presenting the design of the corresponding numerical filtering procedure, it provides a concrete illustration by citing a case where numerical filtering is applied in Intelligent Building Control System. Facts show Application of numerical filtering effectively strengthens the liability of the system.

Abstract: Based on inequality techniques and matrix theory, linear feedback control both with one input and one state or two states and with multi-inputs is proposed to realize the globally exponential synchronization of two Chu chaotic systems. Some new sufficient algebraic criteria for the globally exponential synchronization of two chaotic systems are obtained analytically. The controllers here designed have simple structure. Numerical simulations are presented to show the effectiveness of the proposed chaos synchronization scheme.

Abstract: Compared RNG and Realizable model with experiment results in numerical simulation in inlet passage，conclusion Realizable k-e model is better reasonable in simulation can be pertained. In order to obtain ideal flow pattern ,Realizable k-e model could be using to simulate the passage and analyze flow pattern. Based on the simulation passage configuration can be modified to pursue ideal flow pattern, which can result in ideal inlet of pump and improve pump operating condition, vibration and noise in pumping station. Inlet passage flow pattern can be modified by using triangle piers,comparing different configuration can obtain the ideal results.

Abstract: According to the demand of transmitter for deep exploration, this paper presents a strategy of current double closed loop control based on fractional order controller, which used to improve the tracing performance and anti-interference capability of the current regulating loop, also the stability of load current. And also presents a modified GA-PSO algorithm to get the parameters of fractional order controller. Results show that modified GA-PSO algorithm has faster convergence speed and higher accuracy, new control strategy using in three-phase PWM voltage rectifier has remarkably improved the stability and anti-interference capability of system.

Abstract: Companying with a fire, several feature parameters will be generated. In order to indicate a fire disaster effectively, a design that can detect three kinds of these feature parameters (temperature, CO gas and smoke) is introduced in this paper. The peripheral environment feature parameters will be converted into digital data by corresponding sensing modules included in the nodes. The data will be transmitted to the host computer based on TCP/IP and processed by Neural-Net Algorithms. Though the analyze of the data from the experiment, the nodes show a quick real time response, good operation stability and high speed data transmission. They are very suitable for early fire monitoring in modern buildings to protect human life and properties.

Abstract: Aiming at the existing problems of the monitoring systems of most of the thermal power plants in China, an intelligent information flow based real-time monitoring system of thermal power plant (RT-MSTPP) is proposed. RT-MSTPP is based on the role-based access control (RBAC) model to control different users of business model and the data access, and then realizes the intelligent controlling of the information flow. By using RT-MSTPP, the real-time data of the central equipment in the plant is acquired, their operating state is evaluated and the inchoate fault is predicted. The operating results show that the management of the plant has been improved and the inchoate fault of key equipment can be detected and preliminarily diagnosed.

Abstract: This paper considers Integration of batching and scheduling with features on batch scheduling such as multi-product facilities, multi-stage, set-up time depending on sequence, limited storage. For this complicated problem, we present a Conjunctive model and Heuristic Particle Swarm Optimization. We proposed Local Search (LS) Strategy to improve the HPSO. Computations show that both methods are efficient. In addition, HPSO are better than CM.

Abstract: Aiming at the machined workpiece surface texture images,some technology about image pre-processing and the texture feature extraction based on gray level co-occurrence matrix are researched. Then it is time for the analysis of the texture characteristic parameters based on BP neural network and the identification and diagnosis of tool wear state, Finally the recognition diagnosis system interface is designed by Matlab-GUI.System simulation shows that the interface fusion of image processing and neural network is a good way to ensure the realization of tool wear condition recognition,what’more, the identification diagnosis rate is profect.

Abstract: Special reason and common reason bring on the process disturbance. Statistical process control (SPC) is commonly used to monitor the process disturbance which arises from assignable reason. Engineering process control (EPC) compensates the deviation of output for common reason based on the feedback adjustment principle. Therefore, integrated SPC/EPC approach has better performance than that merely using SPC or EPC. However, in practice, it is very hard to search the appropriate method to apply for integration of SPC/EPC. The main reason is that EPC’s compensation has depressed probability which assignable reason is monitored by control chart. In this paper, a joint-monitoring method is designed to account for the above problems through detecting process output as well as monitoring process input. An example is given to prove that joint-monitoring can detect the process disturbance more quickly and more accurately.