Advanced Materials Research Vols. 156-157

Abstract: In existing multi-population multi-objective cultural algorithms, information are exchanged among sub-populations by individuals. However, migrated individuals can not reflect the evolution information enough, which limits the evolution performance.In order to enhance the migration efficiency, a novel multi-population multi-objective cultural algorithm adopting knowledge migration is proposed. Implicit knowledge extracted from the evolution process of each sub-population directly reflects the information about dominant search space. By migrating the knowledge among sub-populations at the constant interval, the algorithm realizes more effective interaction with less communication cost. Taken benchmark functions as the examples, simulation results indicate that the algorithm can effectively obtain the Pareto-optimal sets of multi-objective optimization problems. The distribution performance is also improved.

Abstract: The features of the widely-used coordinate measuring arm (CMA) are discussed. A novel technology for quick volumetric error verification of CMA is presented. A modular space frame (MSF) to verify and calibrate the measuring accuracy of CMA is invented, which consists of standard balls, links and bases. An effective verification procedure is developed. Results are presented that show CMA can be verified and calibrated with accuracy of 0.015mm in 5 minutes by using the proposed method.

Abstract: Virtual enterprise or e-manufacturing is an advanced and effective manufacturing mode to modern manufacturing enterprises. In these modes, business process has been extended to outer enterprises, i.e. inter organization workflow. In order to achieve a efficient tool for workflow modeling with both simplicity and semantics, matter element is applied to construct a matter element digraph, in which a node is matter element. Then manufacturing service based workflow model can be dynamically changed or composed by matter element transformation. A case is studied to explain the approach presented in this paper.

Abstract: This paper gives a new experimental approach for determination the effect of tool flank wear length on workpiece surface cutting temperature distributions. Three different tool flank wear lengths 0.3, 0.5, 1mm were given by wire cutting, which were much more useful to study the effect of tool flank wear lengths on machined workpiece surface. VarioCAM high resolution head was used to measure the cutting zone temperature distribution, and for protecting the camera lens two pieces of silicon with a thickness of 0.5 mm were put ahead of the camera.

Abstract: Cu-based catalyst is active for methanol steam reforming (MSR) at low temperature. The Cu、Cu+Al2O3 composite and CuO/ZnO/Al2O3 catalytic powers are used as feedstock for coating fabrication by cold spray. MSR experiment and SEM、EDX 、XRD analysis before and after the MSR on the coating has been carried out to study the micostructure and catalytic characteristic of the deposits. Results show that, after reaction the morphology of the Cu coating changes from piled sheets structure to mciro-ramify structure, its porosity obviously increase, the net weight of O、Al in the coating increases, H2 content in the reaction products reaches 74.9%. While for the Cu+Al2O3 composite coating, the content of copper in the coating decreases compared with the initial powder, and the stability of Cu+Al2O3 coating is better than the copper coating in MSR reaction. Particle bonding between coating and substrate and the bonding between the particles in the coating is mainly belonged to mechanical bite and physical bonding; Porosity in the latter two coating is higher than the copper coating. But there is no phase change of the coating. CuO/ZnO/Al2O3 coating shows a much higher activity than conventional fixed bed catalyst due to the reduction of heat and mass transfer resistance in the reactor. So it is available to fabricate catalytic coating by cold spray.

Abstract: It is a key step of finite element method analysis to generate engineering structure mesh. The continuous conceptual model of discontinuous substance is studied. How to select similar-continuous micro-particle size is researched. The continuous conceptual model of soil body and the continuous conceptual method of geotechnical engineering are approached based on the deep mixing pile composite foundation. The results show that finite element method mesh generation based on material-continuous-nature need to more consider, and the minimum of the element size is those of similar-continuous micro-particle and the maximum is limited by the scope of geotechnical engineering project. While the material continuous nature is considered, the continuum theory would be satisfied to simulate engineering structure with finite element method.

Abstract: The site selection for earthquake emergency shelter is important to ensure the safety and service ability of shelter in earthquake disaster. It is aim to establish earthquake emergency shelter site evaluation index system, make use of analytic hierarchy process method to determine the index weight, using comprehensive fuzzy evaluation method to evaluate and order the shelters in certain areas, and ultimately select earquake emergency shelters.

Abstract: For better harmlessly treatment of papermaking sludge, a new technology for solidifying and stabling of sludge was studied. Papermaking sludge was solidified and stabilized by the solidifying agents including cement, powder fly ash (PFA) and cinder. The mechanical properties of solidified sludge block were evaluated by compressive strength, chemical oxygen demand (COD) and heavy metals concentration in the leachate from the solidified block were tested as well. When the solidifying agents has the following composition (cement 0.12kg/kg, PFA 0.02kg/kg and cinder 0.10kg/kg respectively), and the curing time was 6ds, the compressive strength of the solidified sludge blocks reached 360kPa. The results showed that cement and cinder were all positive in the compressed strength of sludge block. If they were mixed with PFA together, they could enhanced the solidification of organic and heavy metals in the sludge. Under this conditions, the COD in leachate from the solidified block was 115.7 mg/L, and the heavy metal concentration had reached the related national standards, after 6ds of curing time, water ratio of the solidified block kept from 35% to 40%, which met the prescribed standards of landfill.

Abstract: Based on the finite element software ANSYS, the magnetic-circuit field of sensor is analyzed. The results of numerical simulation show that output voltage of sensor and inclination angles are linear dependence. The factors affecting the sensor sensitivity are inspected, which include the exciting signal frequency, the peak voltage and the susceptibility of magnetic fluid.

Abstract: The compressive experimental produce is assigned to measure the compressive force, moving compressive length and their time consumption for the purpose of obtaining the quality and economical solid fuel briquette of rice and soybean straw. The two compressive processes are proposed in the analysis of the first compressive process. The results show that for the rice straw, the second compressive process is favorable for fabricating solid fuel briquette. While the hard soybean stems are intend to become the soft stems due to the presentation of broken stems under the high compresses in the first compressive process. The experiment reveals that the soft and hard stems of biomass feedstock shows the different properties which should be paid vital attention when design the pelletisers.