Advanced Materials Research Vols. 503-504

Abstract: In this paper the mechanisms of the bottom radiant noise generation of a given mini vehicle was investigated and the corresponding countermeasures were put forward in reducing the noise of a diesel engine. According to the analysis of acoustic signals and vibration signals measurement, an investigation of the noise source identification in a given vehicle was presented. With the sound intensity method, the major sources of the bottom radiation noise of the engine under three operating conditions were surveyed. The research provides the reliable basis for the engineering practice to reduce vehicle noise level.

Abstract: In this paper, aramid fiber surface metallization was investigated by electroless nickel plating technology. Acid nickel plating and alkaline nickel plating of aramid fiber was compared. Through experiment, it was shown that the temperature of alkaline nickel plating was lower compared with acid nickel plating, and resistance of metalized aramid fibers by alkaline nickel plating was 36.8Ω•cm, and the resistance by acid plating was 51.2Ω•cm. The surface morphology of fibers was observed using SEM

Abstract: When the continuous rigid frame bridge’s actual closure temperature is higher than the design closure temperature, the closure temperature’s difference will cause horizontal displacement at top of pier , and cause the structure to have the temperature intennal force. A horizontal jacking force is exerted to eliminate the adverse effect of closure temperature’s difference. One calculating method of jacking force is proposed in this paper: Eliminating the horizontal displacement at top of pier method. Taking the Longtan River Bridge as a practice example, the high closure temperature’s horizontal jacking force is calculated according to the method separately in this paper.

Abstract: The time effects of different vacuum treatment on the activity index (RZ=A403/A280) of the horseradish peroxidase (HRP) was investigated experimentally via the ultraviolet-visible spectroscopic techniques. The results have shown that Ultraviolet-Visible (UV-Vis) spectra have been changed obviously. Experimental results indicate that the conformation of HRP can be changed by vacuum. The activity index decrease possibly was caused by the conformation variations of HRP.

Abstract: Based on the theories of texture mapping in the Photorealistic Graphics and ray-tracing algorithm, this paper proposes a novel method to simulate the real three-dimensional shape measurement system by projecting a sinusoidal stripe texture on computer 3D models, which are generated by the ray-tracing algorithm. The sizes of the main error sources of the real measurement system can be determined by comparing the real measurement result and the simulation one when measuring a standard block, higher accuracy of the simulation system are achieved by adding these error sources, then the source of the errors in the measured object can be achieved in the same way.

Abstract: UCAV targets assignment is a key research topic in UCAV formation mission planning area. As UCAV targets assignment problem under uncertain detecting information, a new method is proposed in this paper. Firstly, the UCAV targets assignment problem under uncertain dectection information is described. Then, the mathematical model of UCAV targets assignment under uncertain detecting information is established and UCAV targets assignment with SMAA method based on uncertain detecting information is given after introducing the SMAA method. Finally, simulations are presented to demonstrate the effectiveness of this method.

Abstract: The Autopilot is importance for a ship to navigate safely and economically, so we proposes an intelligent reference modeling adaptive controller for ship steering based on neural networks. In order to satisfy the requirements of ship’s course control under various sea status, we used fuzzy logic and neural networks to design the feedback controller, used multilayer perceptron neural network to design the reference model and the identification network. In order to enhance adaptive characteristics of the controller，the parameters of membership functions and connection weights etc were revised online with neural network learning algorithm. The results of simulation shown that the performance of the ship controller is valuable and effective.

Abstract: In order to detect the surface defects of metal work piece, a sensor array is designed based on the principle of eddy current detection. According to the difference of frequency in LC oscillatory circuit, the information of the metal work piece can be obtained. In order to acquire a stable result, an algorithm is proposed to eliminate the transient disturbance and to reduce the influence of temperature drift. With the embedded system of arm7 kernel, the result of data can be displayed in graphical format. The experiment shows that the sensor array has soundness and operability.

Abstract: In Qarham salt lake district, dynamic replacement and gravel piles are always used to treated the saline soft ground. In order to find out the deformation of the composite ground in strong-over saline soil district, surface subsistence is monitored after the ground is treated. The results have an important role in guiding the practice, fill the blank of the test engineering of the highway in saline soil area, and accumulate the monitoring experience in saline soil area.

Abstract: This paper establishes the mathematical model of the system of container crane, and then introduced the CMAC and PID compound control principle and characteristics, and PID control of the position of the container crane , CMAC-PID control of the position of the container crane, and CMAC-PID control of container crane's position and angle. The simulation results show that the crane based on the CMAC and PID compound control has a very good positioning and anti-swing effect.