Advanced Materials Research Vol. 658

Abstract: As cultural life becomes rich,people have increasing demands for stage effects on performances.In some top grade cultural sites and entertainment venues,hydraulic lift stages replace traditional stationary stages for the sake of creating lively three-dimensional performance effects.However, stage hydraulic system is relatively huge.It’s not easy to check out the location of the fault quickly, which makes the efficiency of resolving the fault low. Based on the simulation of the circuit of stage hydraulic system,by means of collecting,transforming and analyzing pressure and flow signal of “final mile” of stage hydraulic system under different pressure conditions,we can summarize the relationship between pressure and flow as well as realize remote monitoring. And then we can determine whether there is a fault,and resolve the fault in time. In addition,a solenoid valve is added to the circuit,which makes the two-way circulation loop possible.

Abstract: According to structural characteristics and measurement needs of tip clearance of turbine engine and other rotating blade device, a leaves lattice model with vector characteristics is established. Based on measurement principle of the capacitive displacement sensor, the tip clearance measurement model is established. The spatial filtering effect and the impact of the tip clearance measurement results caused by blade thickness, sensing zone size, blade rotation speed and signal sampling rate is analyzed. The research results show that there is a minimum requirement about sensing zone size, blade rotation speed and signal sampling rate under the condition of certain blade thickness. The conclusion provides an important theoretical basis for the design of the tip clearance measurement system.

Abstract: This paper is to investigate the thermodynamic feasibility of cogeneration gas/steam combined cycle, in which a computer program, called “Cogeneration Design" has been developed using MATLAB (v7.8) for the analysis. In this cycle one can take advantage of the thermal energy to produce steam which can be used in some small and medium-sized factories such as dairy , juice, soap, paper factories, as well as in desalination plants and other industrial applications need hot water or steam. Here, the thermodynamic analysis is carried out according to three cases, (1)non condensing steam turbine, (2) condensing steam turbine, (3)extraction condensing steam turbine. The results obtained show a difference between the three studied cases, in which the overall efficiency is the highest for case (1), equal 52.82 %, then for case (3), equal 49.13 %, then for case (2), equal 45.31 %.

Abstract: The aim of the present study is to utilize the excess energy of combined cycle power plant (CCPP) in desalination unit in cases of low electrical demand loading conditions. The main components of proposed (CCPP) included the gas turbine and steam turbine units. Gas turbine produces the major part of the developed power, while the steam turbine produces the remaining one in case of peak loading conditions. For the case of base load, the excess energy of steam turbine is used in desalination unit.

Abstract: The present study deals with the main parameters of a storage tank-collector system, the proposal system included a flat plate solar collector coupling by a storage unit to serve the energy requirement of small Libyan family (3-5 persons).The studied parameters included the selection of the storage size needed for a given collector area and a given load under Libyan climatic condition. These parameters include the appropriate location for inlet and outlet ports of the hot water in the storage tank.A mathematical simulation model was written based on the given parameters and the input data of Misurata city in libya the location (L=32.15 N, 15.15W) as a case study. The developed program was carried out in visual basic 6.The final results showed that a storage tank with a capacity of (125 Litters per square meters) is sufficient to cover the requirement of Libyan family (3-5 persons). Also,. Furthermore, the hot water from the collector should be entered the storage tank at the upper portion of the tank to satisfy for the previous enhancement.

Abstract: In order to assess the safety of the explosive anti-riots munition, proceeding with the fragment’s force condition was analyzed in the flying process, the dynamical model of the fragment for the explosive anti-riots munition was deduced, then the velocity decay property of different shape fragments were calculated and analyzed also. The results show that the velocity decay of the spherical fragment is slowest, next came the rectangular fragment and the irregular shape fragment, with the same initial velocity (_v0) and separation angle (α), and the velocity decay of the same fragment at α >0 is more quickly than at α <0, with the same initial velocity (v0).

Abstract: Temperature is the most important external impact factor on the performance of lithium-ion battery used in electric vehicle. The affection mode and internal mechanism of temperature on the capacity and internal resistance is analyzed qualitatively based on the accelerated life testing results. And the issue related to the implementation of the battery life evaluation is also discussed. The testing samples for this study are two types of high power lithium-ion battery with 8Ah rate capacity, including Manganese oxide lithium-ion battery and Phosphate iron lithium-ion battery.

Abstract: In order to improve showing effect of the aircraft assembly simulation, a new assembly process simulation optimization method was proposed with combining evaluation of viewpoints with view transformation. First, viewpoints evaluation principle was put forward according to assembly simulation features; then a new view coordinate system was calculated based on the view coordinate system transformation matrix by integrating the direction of assembly paths with the viewpoints evaluation principle; finally, entire optimized process of assembly simulation was analyzed. Efficiency of this method was verified by comparing the result of the optimized wing box assembly simulation with the one which had not been optimized.

Abstract: Engineering change (EC) is one the most important and complex issue in the manufacturing industries. The production schedule is always affected by ECs. To reduce the EC cost as well as its impact on production schedule, this paper presents EC implementation planning method. Three types of EC implementation planning is proposed according to the result of comparing the exhausting time point of the old materials with the arrival time of the new materials.

Abstract: In Thailand, according to the bus accident statistics referred to Department of Land Transport (DLT), the highest risk represents the frontal crash accidents. In case of frontal crashworthiness, the high- decker bus safety was referred to the regulation no.29 of United Nations Economic Commission for Europe (ECE-R29). In this study, the frontal impact analysis of the high-decker passenger bus structure based on ECE-R29 using Finite Element (FE) analysis was focused on. The energy absorption including to the total deformation of the frontal cabin were evaluated. Three-dimensional FE model of frontal bus structure with- and without- simple impact attenuator were created and analyzed using ANSYS/Explicit software. In accordance with the results, the average magnitude of kinetic energy in case of impact attenuator revealed the value lower than those without impact attenuator owing to absorb energy in the impact attenuator. In addition, the total deformation regarding to the safe zone of the frontal cabin in the case of with impact attenuator were lower than without impact attenuator as 75.8%. Therefore, the frontal impact attenuator should be recommended to a high-decker bus for the driver protection in the event of crash accident.