Advanced Materials Research Vols. 291-294

Abstract: The origins and popular history and current status of platform shoes were introduced. The cycle and causes of its prevalence evolution were discussed. Customer demand characteristics, functional characteristics, modeling features and style characteristics of platform shoes were refined and studied, which laid the foundation for style reusing. The prevalence trend of platform shoes was predicted.

Abstract: The conditions of cascade extraction and isolation of some active constituents from Siraitia grosvenorii were optimized. The active constituents were extracted by ultrasonic extraction and isolated by chromatography; the obtained active constituents were determined by HPLC and/or spectrophotometry etc. The yields of the active constituents were as follows, mogroside 3.97% (purity 91.84%), polyphenol 3.45%, free polysaccharide 12.53%, free oligosaccharide 11.96%, combined polysaccharide 2.29%, combined oligosaccharide 2.88%, amino acids 6.54% and alkaloid 7.06%. This extraction process could be used as a guideline for the multi-utilization of Siraitia grosvenorii.

Abstract: The dynamic analysis has been adopted for the calculation of the low-order natural frequency and harmonic response data of the steel tower of vertical axis wind turbine, as well as the dynamic relation between the wind turbine and the tower. When the wheel rotates at 160rpm, the harmonic load has a very serious destructive damage to the tower. In order to avoid the system failure caused by the system resonance in the engineering design, some optimizations have been taken on satisfying the security and reliability of the tower. This study provides the scientific basis for the dynamic design and the optimization. The conclusion shows that the most effective method of raising the natural frequency is to reduce the weight of the structure when the material and the structural style are determined. As a result, the difference between harmonic response and resonance frequency of the structure rises to 21.3％ from 0.3％ after reducing the weight of the tower by 21.3％.

Abstract: In order to optimize the multi-objective flexible job shop scheduling problem (FJSP) roundly, multi-objective mathematical model is established, including makespan, maximal workload, total workload and total tardiness. In this paper a dual coding method which takes operation arrangement and machine selection into account is employed, and designed new crossover and mutation methods, the infeasible solutions are avoided. In order to deal with the multi-objective optimization problem, a new non-dominated sorting method is introduced, which can get the Pareto optimal solutions quickly and correctly by dividing the whole population into three parts. Example shows that the algorithm is efficient.

Abstract: This paper expatiates hydrodynamic time-domain analysis on strategic oil storage vessels in free floating condition or with dolphin-fender mooring system by means of AQWA numerical software. The results indicate that motion responses of the oil storage vessel with dolphin-fender mooring have improved significantly. The time-history of wave diffraction forces in incident wave direction are basically consistent between the free floating and moored condition. However, in vertical direction of incident wave, the diffraction wave force of the oil storage vessel in free floating condition is obviously different from that with mooring system, which is the result of the coupling interaction between dolphin and vessels. Mooring forces include fender reaction and cable tension, as for which dominate, it depend on evocable motion responses about incident wave direction.

Abstract: This paper introduced a kind of reflector mirror support structure of IRST system. The scanning reflector mirror support frame material is Ly2 aluminum under the principle of the suited of material expanding quotient. The support form of the reflector was talked, and the system bracket structure was designed following the requests of the certain complex IRST. The bracket was optimized and analyzed under the best structure quality and the least moment of inertia, and the bellowing of bracket plane thickness, mode frequency restriction and deadweight restriction. From the result we can see that the bracket mass can reduce from 0.73kg to 0.49kg and the moment of inertia can reduce from 0.0109kg㎡ to 0.0056 kg㎡ under the first precondition of the structure mode frequency being low and the biggest transmogrification being teeny. The base frequency and intension of the complex IRST system can be indicated well after the finite element analysis static checking.

Abstract: The project management optimization for an important aspect of the scheduling scheme is reasonable to reduce costs, improve quality and shorten the cycle. Traditional project scheduling and optimization methods have been unable to fully meet the rapid development of modern project management needs. The PSO (Particle Swarm Optimization) is a simulation of birds the heuristic search algorithm mechanisms, which function optimization, constrained optimization, minimax problems, such as multi-objective optimization problem. It has become an important branch of the many related optimization fields. Although the project is to optimize the scheduling, many traditional methods can achieve good results, but the particle swarm algorithm can achieve a greater degree of optimization. In this paper, research on the particle swarm optimization of the basic principles of their algorithm for the initial exploration process, compared the effectiveness simulation of particle swarm optimization and traditional genetic algorithm in optimal scheduling of the project . Therefore, the original project plan with the optimal scheduling on the basis of introduction of particle swarm optimization algorithm can get better quality, shorter cycle and fewer costs, and ultimately get the entire optimal project cycle, project quality and project cost.

Abstract: Calculation of the LCD director and transmission based on the continuous elastic theory, difference iterative method, and the Berreman’s 4×4 matrix method is shown. The realization of this procedure is in Visual C + +. We made a Visual C + + and Matlab interface to achieve the call of the required function out of Matlab. In the case of TN-type LCD, the software has been validated to be correct and reliable. The chiral HAN-mode was described by our laboratory which characteristics were not clear. Transmission has been calculated by using the software with different parameters. The results of the contrast - viewing angle curves show that: the chiral HAN-mode liquid crystal display can achieve wide prospective. We found the optimal setting parameters: Δnd = 0.48μm, p₀ = 5 μm, any wavelength of visible light, and the polarizer angle =90° to achieve wide prospective from -85 ° to 85° in the horizontal direction.

Abstract: Tower cranes are made of steel structure, which account for more than half of their weights. Therefore, steel structre optimization of tower cranes is important for the development of design technology of tower cranes. This paper develops a systemic optimization method for tower cranes based on Ansys OPT, combined with finite element analysis (FEA) and stability theory. This mathod is firstly used in the optimization of the boom of luffing jib tower cranes. New optimization model of the boom of luffing jib tower cranes is introduced and the corresponding optimization program is developed. The integration of the calibrating of overall stability and single-limb stability of luffing jib tower cranes, FEA and OPT is realized by extracting some parametes from FEA results, such as weight and axial force. Rapid optimization of the boom of luffing jib tower cranes is realized by the parametrization of non-design variables. Direct reading of optimization results is realized by the discretization of design variables. Finally, the boom of a tower crane with movable arm is optimized with the optimization program to demonstrate the effectiveness and superiority of the optimization method.

Abstract: We address a two dimensional bin packing problem in this paper. Firstly, we adopt and improve bottom left placement method, which is presented as bottom left corner-occupying (BLCO). Secondly, borrowing from the respective advantages of the two algorithms, a hybrid of genetic algorithm (GA) and tabu search (TS), is developed to solve the problem. Thirdly, using a new neighborhood structure combined with the appropriate move evaluation strategy, we propose TS to re-intensify search from the promising solutions. The hybrid GATS is tested on a set of instances taken from the literature and the computation results validate the quality of the solutions.