Advanced Materials Research Vols. 452-453

Abstract: The surface of PVC has been treated by coupling agent before plating Ni-P alloy film .Then Ni-Cu-P film with different components was prepared on the surface of PVC according to copper salt concentration. The effect of these factors such as time and copper salt concentration on the film component and surface resistivity was analyzed. And the electromagnetism shielding efficiency of all the Ni-Cu-P alloy film on the PVC was tested by the network analysis measurement. The result showed that for the plating solution of lower copper salt concentration, when the reaction time increased, the Cu component of Ni-Cu-P alloy films increased too. The surface resistance ratio of the Ni-Cu-P films decreased with the increase of Cu component. Ni-Cu-P amorphous alloy film performs a stable electromagnetic shielding property of 35 to 60dB when the electromagnetic wave frequency ranges from 5K to 1.5GMHz.

Abstract: In order to grasp timely and accurately quality of high performance concrete, detection of compressive strength of high performance concrete can be non-destructively, rapidly and accurately tested that is very testing index. The paper did some research on compressive strength of high performance concrete applying redound method that it established several estimation models between rebound value and compressive strength. Experiment shows that rebound method can effetely test compressive strength of high performance concrete. Construction quality of Cement concrete structure can timely grasp applying the method.

Abstract: An error compensation model in turning based on PID adjustment was investigated in this paper. A new method is proposed to eliminate the effects of probe radius. Simultaneously, PID error compensation model is used to regulate the comprehensive error to obtain the actual quantity of error compensation. Computer-aided technology is applied to complete the algorithm, and then a new processing path is generated. The experimental results indicate that the precision of workpiece can be improved from 0.01mm to 0.003mm after three steps of error compensation.

Abstract: The slipper pairs with concaves of reasonable and unreasonable structures and without concave originally are chosen for the experiment. The experimental results show that appropriate concave distribution can improve the wear and tear condition of the slipper bottom. Under the same experimental condition, the fringe wear volume can be reduced by 28.77%, and the overall wear volume 68.72%, which is the best result.

Abstract: By analyzing factors affecting the accuracy of boring process on the precision boring machine, the article aims at putting forward a method of improving the accuracy of boring process by means of installing polymer elastic shock absorbers on unilateral boring tools. In addition, the situation of non-linear radial forced vibration is formulated by a dynamic model of second-order differential equation. Based on the model, vibration prevention principles of unilateral boring tools have been discussed and systematic parameters have been optimized for enhancement of the boring process accuracy.

Abstract: Civil aircraft is a complex product to manufacture, and the collaborative supply network consist of grades suppliers plays an important part in the progress of development. Due to the interferences from every kind of uncertainties to the network, it’s necessary to find out the critical supply path which decides the completion date for the network going well. This paper first sets the supply network model based on the hierarchical structure of civil aircraft, and then uses Dijkstra and ant colony optimization (ACO) searching for the critical path respectively, in the last the two methods are compared in order to prove performance and superiority.

Abstract: Fuel cell vehicle has been studied to improve emission and vehicle performance. The limitations of fuel cell vehicles, including high costs, limited accelerating competence and inadequate driving range must be improved so that they will be widely accepted by the consumer market. Better understanding on the underlying mechanisms of fuel cell vehicles and adequate optimization tools for designing their power train systems is much needed. This work focuses on the key issues through the simulating and experimental tests of fuel cell vehicle using a custom made dynamometer, a fuel cell scooter, which serve as generic, but easy to operate equipment to validate new computer models and modeling methods for fuel cell vehicles. The results support better understanding on fuel cell vehicle performance modeling. Based upon the new and validated models, design optimization is carried out for the fuel cell vehicle. The study and its results can be used in the development and evaluation of various fuel cell vehicles.

Abstract: In this paper, the principle and structure of the solar light pipe systems are introduced, and applications in USTB gymnasium are also included. The internal illuminance of USTB gymnasium is calculated using two different methods, which are utilization factor method and measuring method. In the end, the prospect of the solar light pipe systems in the future is also predicted.

Abstract: Through the Pro/E software, build straight moving disc cam follower motion equation of the curve, establish the cam modeling, and assemble to make the cam work simulation, revise cam outside contour profile equation, so as to improve the design of cam mechanism.

Abstract: The civil aircraft’s manufacturing process is complicated because of its complex structure and various parts in need. The stability and high efficiency of the based supply network decides the coordination ability among departments and the development cycle completion date. Now it’s very urgent to study the robustness of the collaborative supply network. This paper optimized and designed the robustness of the civil aircraft supply network, first with the project evaluation and review technique (PERT) we set a supply network model; then optimized the critical path to make the system functions remain constant, and the civil aircraft supply network robustness got optimized