Advanced Materials Research Vols. 538-541

Abstract: This paper proposed discrete particle swarm optimization(DPSO) algorithm to solve lot-streaming no-wait flow shop scheduling problem(LNFSP) with the objective of the maximum completion time. The natural encoding scheme based on job permutation and newly-designed methods were adopted to produce new individuals . After the DPSO-based exploration, a efficient fast local search based on swap neighborhood structure is used to enhance the exploitation capability. Simulation results show the effectiveness of the proposed algorithms.

Abstract: The grain growth kinetics of Q235 during reheating process was studied with Monte Carlo (MC) simulation. Heating process was performed at 1223K, 1273K, 1323K, 1373K, 1473K and 1523K for 10s, 20s, 40s, 80s, 120s, respectively. Samples were tested on Gleeble 1500 thermal simulation tester. The experimental results were analyzed regressively to obtain grain growth kinetics equation. The kinetics equation of Q235 was introduced to MC simulation to simulate the microstructure evolution and compute the average grain size at different step during heating process. MC simulation results showed the grain distribution under different time and the grain growth is in consistent with physical simulation. The simulation results also can help to set processing parameters during reheating of ingot.

Abstract: RTM is also called resin transfer moulding, it is one of the leading technology in the field of FRP. With the help of FLUENT, a powerful computational fluid dynamics software, we have finished the process simulation of filling the mould. In the process simulation, the flow striker, pressure field and velocity field are clearly showed. And they can describe the process of RTM effectively.

Abstract: Using the discrete dipole approximation method, the absorption, scattering, extinction efficiency factor and differential scattering cross section of four kinds of nano-graphite particles under different incident angle are numerical calculated, the result shown that the value of the absorption, scattering, extinction efficiency factor and differential scattering cross section of linear nano-graphite particles are symmetric on the incident angle. There are the same variation tendency of absorption and extinction efficiency factor changed with the incident angle, when the incident light parallel with the linear nano-graphite particles, both the absorption and extinction are the strongest, and when the incident light perpendicular the linear nano-graphite particles, both the absorption and extinction are the weakest. The variation tendency of scattering efficiency factor changed with incident angle depended on the number of single graphite and the arrangement of linear nano-graphite particles. The value of differential scattering cross section is the smallest while the incident light parallel with the linear nano-graphite particles, however, the biggest while the incident light perpendicular the linear nano-graphite particles.

Abstract: Based on the failure analysis of a certain tractor clutch, some local structures of the clutch cover has been modified and optimized. The various improvement schemes were analyzed by using the finite element method and an evaluation method of flatness of local regions was introduced in the paper. The results show that the maximum displacement and the flatness of local boss of the 2nd improvement scheme are separately reduced by 22.5% and 41.5% compared with the original. So the local stiffness of the clutch cover has been greatly strengthened. All these are important guidelines for the optimization and improvement of clutch covers.

Abstract: Telescopic aerial boom system is used transport the object or can be used to ease working high altitude. Installation of high voltage transmission tower due to urbanization is increasing. Because working on high places such as wiring Operations and electrical maintenance has increased the demand. Boom of aerial work platform are made of steel. So, necessity for safe isolation aerial work platform used for electrical work is increasing. This paper is proposed about applied to the material used in the aerial work platform boom. Insulating material was applied to the aerial work platform the last end boom in boom system. In this paper aerial work platform boom is characterized by apply insulating material and lightweight through self-load reduction and isolation. In this paper analyzes the design of the telescopic aerial boom system of applying the insulating material using the ansys. Then design was verified through comparison of the insulation telescopic aerial lift system and Mass-produced existing telescopic aerial boom system.

Abstract: Droplet deposition and solidification is vital to dimensional accuracy and mechanical properties of components prepared by uniform droplet spray (UDS) forming. In this paper, a volume-of-fluid (VOF) based model was developed to study the deposition and solidification processes of a 1 mm Al-4.5%Cu droplet generated by drop-on-demand jetting. The effects of droplet falling velocity (0.6-0.8 m/s), initial temperature (933-973 K), and substrate temperature (300-473 K) were investigated. The results show that the final morphology of the deposited droplet is largely dependent on falling velocity and substrate temperature. The solidified droplet obtained from an UDS experiment validates the numerical simulation.

Abstract: A number of factors must be considered when selecting a convention site. Typically, most selections are based on the decision makers’ knowledge and experience, which may lead to biased decisions based on the decision makers’ subjective judgment. This study establishes decision-making evaluation factors and attributes for convention site selection based on a literature review. After surveying experts’ opinions using questionnaires, we employed the fuzzy analytic hierarchy process (FAHP) to analyze the weighting of the factors and attributes. The results show that of the five evaluation factors, site environment is the most important, followed by meeting and accommodation facilities, local support, extraconference opportunities, and costs. Additionally, the five most important attributes among the 20 evaluation attributes are the suitability of convention facilities, suitability and quality of local infrastructure, climate, city image, and political conflict or terrorist threats.

Abstract: Stamping process of sheet metal is widely used in the automobile industry. How to improve the quality of plate molding is a challenge for stamping process workers. With the development of the numerical analysis method and the computer technology, Computer Aided Engineering (CAE) technology is widely applied in the industrial areas. As the CAE technology comes up, a qualitative change has happened in the stamping process of automobile sheet metal parts. This paper presents one stamping process simulation of auto rearview mirror installation plate by using the software DYNAFORM.

Abstract: A solid model and finite element model of nine-roller constant roller spacing of large H-shaped steel were set up, researching the problems of elastic-plastic deformation in straightening simulation for nine rollers continuous straightening process of large H-shaped steel. Through analyzing the stress and strain relation of large H-shaped steel, and analyzing the residual stress of H-shaped steel in the straightening process, a theoretical basis for the further step analysis the residual stress control after the H-shaped steel straightening was established.