Applied Mechanics and Materials Vols. 34-35

Abstract: According to the limitations of existing innovative design methods, a research ideology was proposed, namely man-machine intelligent collaboration. Based on this ideology, the characteristics of information exchange between human information processing system and external design environment was analyzed, and the inherent mechanism of man-machine intelligent collaboration was explored. Moreover, some cognitive principles that the support system should follow were put forward. In terms of the characteristics of product design, incorporating cognitive science, information technology, and design technology, a computer-aided innovative product design process was presented. Finally, a preliminary prototype system of computer-aided design for product innovation was developed based on the theoretical researches aforementioned and some running instances of the prototype system were described.

Abstract: Computational trust and reputation models have been recognized as one of the key technologies required to design and implement agent systems. These models manage and aggregate the information needed by agents to efficiently perform partner selection in uncertain situations. In this paper, by taking advantage of the non-monotonic knowledge representation and reasoning mechanisms of defeasible logic, a reputation-Oriented Agent model is proposed, which is capable of accepting policy guidance, the real-time rule modifications, and handling the run-time rule conflicts. This agent is both autonomous and controllable, and is able to cooperate with other Agents via contracts in an open and dynamic environment.

Abstract: In a multi-agent system, the behavior of agent is difficult to be predicted and controlled reliably because of agent's autonomy, thereby which causes the “trust” crisis that whether the overall goal can be completed or not. In this paper, the multi-agent system credibility of research is introduced from the trust and reputation, and the existing collaboration systems are pointed out that which is lack of controllability and credibility, finally the method of solving credibility of multi-agent system is proposed, namely a two-tier policy-oriented mechanism and a credibility ensuring principle. The executing of system is controlled and guided from looking the collaborators, collaboration established, consultations and negotiations and other sectors, thus the implementation behavior of the system is ensured that which is controllable and trusty.

Abstract: The porous media for liquid transporting and mechanical analysis, which are the hotspot studies in contaminant transport and machinery manufacturing, is hard to model in the computing simulation for the complexity of the media’s porosity. In the paper, an integrated approach is proposed to model the porous media with the framework of but not limited to sphere particles. Firstly, a series of particles are generated according to the grading curve in a closed box with the PFC3D, and then let the particles deposit freely for the gravity. After that the position and radium of each particle are exported to a file for import of AUTOCAD, where the particles are re-generated by the VBA script and the model for particles is constructed. The needed model is the porosity among the particles, so the model size is determined by a block and the model is gotten with the Boolean Operation which subtracts the particles from the block. And then with the different boundaries, the water transporting simulation in the porous media model is carried out with the Finite Volume Method (FVM). The results are proved reasonable by the previous studies.

Abstract: This paper presents a newly approach for modeling thrust force in drilling of PA-6/ Nanoclay Nanocomposites materials, by using Particle Swarm Optimization based Neural Network (PSONN). In this regard, advantages of statistical experimental algorithm technique, experimental measurements, particle swarm optimization and artificial neural network are exploited in an integrated manner. For this purpose, numerous experiments for PA-6 and PA-6/ Nanoclay Nanocomposites are conducted to obtain thrust force values by using drill of high speed steel with point angles and 2mm in diameter. Then, a predictive model for thrust force is created by using PSONN algorithm. Also, the training capacity of PSONN is compared to that of the conventional neural network. The results indicate that nanoclay content on PA-6 polyamide significantly decrease the thrust force. Also, the obtained results for modeling of thrust force have shown very good training capacity of the proposed PSONN algorithm with compared to that of a conventional neural network (BPNN).

Abstract: . In this paper, we propose the concept of generalized green computing and give the limit and the scope for it, including the research task and relationship. Firstly, according to the aspects of computer system, we emphatically analyze the negative influence of computer system bringing to natural environment. Secondly, we introduce the technology and method of generalized green computing in order to analyze the deep meaning of technology hidden behind. We also put forward implement scheme of generalized green computing for research institutions and enterprises. Thirdly, we present some basic ideas and approaches of generalized green computing, aiming to form the foundation of generalized green computing on specific model, methods and tools.

Abstract: Viscosity loss occurs in polymer flooding in middle and high permeability reservoir. For larger specific surface and more clay in low permeable rock, the actual viscosity of polymer solution is more important. Polymer cores’ flow experiments are reported which were performed using long natural geological outcrop sands cores. These cores were in good simulation of natural cores and the length of cores allows viscosity variation mechanisms that occur when polymer solution flows through long distance. These mechanisms can not be assessed by silica cores of conventional length. Results of polymer cores’ flow experiments gives viscosity of polymer solution after it through different permeability cores, and the effects of molecular weight, concentration of polymer, migration distance, permeability, and injection velocity on viscosity loss rate. Results show the molecular weight and concentration of polymer is higher, or the core’s permeability is lower, and the viscosity loss of polymer solution through cores is greater. Injection velocity is found to be insignificant within 15m/d for polymer with middle or low molecular weight. This simulation work confirms the viscosity loss mechanism for one polymer in low permeable cores.

Abstract: A finite volume method has been formulated based on the ideal compressible potential theory. By using the continuity equation and Tait state equation as well as Riabouchinsky closure model, an "inverse problem" solution has been presented for the supercavitating flow. According to the impenetrable condition on the surface of supercavity, a new iterative method for the supercavity shape has been designed to deal with the effect of compressibility on supercavity shape and pressure field. The supercavity shape changes from ellipse to taper, as well as the drag coefficient increases with Mach number increasing. The results compare well with the experiment data and empirical formula, and the numerical method is proven to be valid.

Abstract: Because of the combination of self-made or common boring bar and CNC program, we machined two external cylinders used for tightening ring (φ500u6(+0.58/+0.54)×130mm ) of a vertical roller mill, and conquered the difficulty on machining high-precision cylindrical on the boring machine. This process improvement not only brings the machining advantage of CNC machine tools into full play, but also organically integrates conventional boring to turning methods, which can cause high machining efficiency. Since the special tooling is not needed and it’s easy to obtain materials from local sources, we can adjust the process in a large range. The implementation of this processing method is meaningful for the reference and promotion of processing such short cylinder by turning on the boring machine.

Abstract: The deformation process and crashworthiness of the structures is the research object by the numerical method in the paper. Based on the efficient model for simulation and successful calculation, the impact response and energy absorption of four thin-walled structures has been analyzed and estimated by the simulation of impact process.