Advanced Materials Research Vol. 937

Abstract: Elastic modulus error is the key factor influencing to the forming precision of grinding tool bended in the aspheric processing. The mathematical model of the grinding tool bended has been established through mechanics and the mathematics method, the error formula has been inferred and the influence of elastic modulus error has been analyzed, the calculating example has been given. The result indicates had to confirm material’s elastic modulus value according to the precision request of workpiece in choosing grinding tool material and control it in the certain scope, thus guaranteed the grinding tool the forming precision, further improve the workpiece the face shape precision.

Abstract: An analyzing rotating error method has presented based on grinding aspheric optical component. A coordinate transform has been done between the new and original coordinates system in view of the rotating error in installing parts, further, the rotating angle error model has deduced between actual curve and theoretical curve. The surface error formulas can be used for variety of rotary conic aspheric curve, depending on the requirements of the parts surface accuracy, quantitative adjustment target can be given in installation and adjustment process before grinding. Based on the rotating error formulas, the calculating example shows that installation angle bas various different influence to surface shape error, the error decreases with the θ decreasing, the surface error is reduced a magnitude accordingly when the angle is reduced to a magnitude. The parts surface error is up from-0.0030mm to-0.0448mm when the rotating angle increasing from 0.1° to 1°. When θ is constant, the surface shape error increases with steepness increasing, installing rotating angle requirement is more stringent for all the large steepness parts.

Abstract: Effect of different gauge of pin carding plate and saw-tooth carding plate respectively installed under the licker-in of carding machine on polyester yarn hairiness was studied. The hairiness of polyester yarns produced in the condition of installing pin carding plate and saw-tooth carding plate under the licker-in at four different gauges were tested by YG172 yarn hairiness tester. The results show that the two kinds of carding plate at the gauge of 0.7mm are most beneficial to reducing the number of polyester yarn hairiness. When the pin carding plate gauge is 1.0mm and the saw-tooth carding plate gauge is 0.3mm, the number of polyester yarn hairiness is the most. As a whole, installing saw-tooth carding plate under the licker-in is more favorable for reducing the number of polyester yarn hairiness.

Abstract: Based on chemical on-line hydrogen production, the author proposes a technical solution of Emergency Power Supply System Battery,and the hydrogen supply system, fuel cell stack, the control system and the water-heat balance management system was presented, and the prototype of 1kw hydrogen battery was trial-producted through integrated and modularized design. The actual test shows that the continuous power supply time is over 4 hours. It can be used as the ideal emergency power supply equipments in emergency disaster relief actions.

Abstract: At present, most of the domestic train wheel detection is still manual. Existing image detection methods do not fully consider the characteristics of wheel profiles, as the algorithm is very complicated, they do not apply to fast dynamic monitoring. The paper proposes a dynamic image recognition method of train wheels based on contour feature. Firstly, wheel contour curve is extracted using RCD circular arc detection algorithm with constraint condition. Then, after analyzing the wheel contour curves, vector contour is constructed to describe them. At last, images of wheels are rapid recognized, and the recognition is based on identification function. Experimental results show that this method can achieve 95% accuracy when the similarity of complete wheel is set to 0.98 or more. This method can adapt to railway environment and has a certain application value.

Abstract: In order to evaluate the application effect of spinescence as an alternative to metal segregating gratings of expressway, the evaluation system is built. By using the methods of AHP and FCE the comprehensive isolation effect evaluation of Solanum deflexicarpum is carried out. The result shows that the comprehensive evaluation method can guide and enhance the effect of future spinescence application on segregating gratings engineering of expressway.

Abstract: Fire resistance performance of structural members has been evaluated from each singular section and standard fire curve since the beginning of fire tests. However, the need of the exact fire resistance of H-section columns applied in the steel buildings has increased. The main reason for this is there is a difference between the conditions being conducted during the fire test and that from real situation. In this paper, the structural stability of H-section column made of an ordinary strength grade structural steels, SS 400, SM 400, and SM 490 at high temperature were evaluated and compared with boundary conditions and column’s length. This was done in order to suggest a new guideline for the application of fire protective materials in steel column in which the boundary conditions and column lengths are different from that tested with hinge to hinge and 3500 mm. The findings from this study showed hinge to hinge boundary condition was more conservative. And fire resistance performance of longer columns in the case of hinge to fixed and fixed to fixed boundary condition than from 3500 mm and hinge to hinge boundary condition can sustain at high temperature without adding fire protective materials.

Abstract: In this paper, using finite element analysis software, the bridge with lead rubber bearing are analyzed, using parametric technology combined with finite element simulation, the parametric modeling and solving complex combination structure. After the analysis, the stiffness matrix of different parameters of the lead rubber bearing, provides a numerical basis for the overall quantitative analysis for bridges.

Abstract: Based on test data of the prestressed anchor cable composite soil nailing wall deformation and internal force of structure of Shenzhen Holiday Plaza foundation pit, the numerical simulation model of foundation pit is established by FLAC^3D software. Through the reasonable selection of soil constitutive model and structural unit, the numerical simulation model is consistent with the project practice. The simulation results on horizontal displacement of foundation pit, the internal force of the structure, the surface layer stress and damaged form are reasonable. This does not only provide a strong basis for the optimum design of the foundation pit, but also provide a scientific guidance for engineering application.

Abstract: Composite foundation settlement of piled raft structure in Da Xi passenger dedicated line is analyzed by the large finite element software MIDAS/GTS and established calculation model of foundation treatment. The problem of pile-soil contact is highlighted in the trail and analyzes the settlement nephogram and pile-soil stress nephogram. On this basis the foundation settlement factors was analyzed systematically that focus on the elastic modulus of pile, pile spacing, pile diameter and pile length in foundation treatment, especially for the characteristics parameters of contact element. Result shows that increasing the pile modulus, pile diameter, pile length and decreasing the pile spacing is all conducive to reducing settlement. The best advice is got that the pile diameter should be not more than 0.5m, pile length not more than 27m and the pile spacing be around 2m.