Advanced Materials Research Vol. 461

Abstract: A type of GPS-navigation wheel testing vehicle was designed for operating in field environment. The commonly used material and standardized parts were selected to construct mechanical system; and the general electronic component as well as personal computer was used to construct the control system. The experiment conducted with the testing vehicle shows that the vehicle has sufficient capacity for ordinary loading, meanwhile it runs smoothly and of good maneuverability. It provides a practical platform for studying GPS-navigation technique applied on agricultural machines in field working condition

Abstract: Much effort has been devoted to studying the blast properties of masonry infilled panels due to recent increasing accidental blast events. In this paper, the blast properties of the masonry infilled walls were analyzed with the finite element program LS-DYNA by the way of distinctive consideration of the bricks and mortar material in contrast to the experimental data. The numerical results have a good agreement with experimental data. The reliability and efficiency of this method in predicting the dynamic responses of masonry walls to blast loads was proven.

Abstract: This paper presents a virtual plant system, which is employed in the teaching process of the BTEC course of Control System and Automation. This system simulates different physical plants and demonstrates that experiments based on the virtual plant system can give students a vivid experience in this course. The virtual plant system has been proposed to reduce cost and simplify maintenance of lab facilities. As we do both, the development and employment of virtual plants, the paper includes approach to virtual plants development, description of some of them as well as our experience of their usage. The virtual plant system improves previous educational experiences in the course of Control System and Automation

Abstract: As a crucial part of rainwater utilization engineering, the design of the cistern size has a great influence on the project investment and efficient operation of systems. In this study, the mathematical models of relationship among the effective volume, investment and water-saving benefits are established based on the rainfall data of typical year. With the help of these models, we can calculate the effective volume of rainwater cisterns, then analyze the engineering benefits and demonstrate the feasibility of the project. So this paper offers reference for the effective volume determination of rainwater cistern in city districts.

Abstract: The variable flow cooling water system can achieve energy saving benefits just like variable primary flow chilled water system for central air conditioning system. How to design the control system with appropriate control algorithms and control strategies is particularly important. We can clarify the basic control principle of variable cooling water flow technology based on the analysis on DOF (degree of freedom) of cooling water systems, it is important for control system design. The article pointed out explicitly that the realization of variable flow technology for cooling water system must construct two control loops, one for cooling water supply temperature the other for return temperature, further more discussed control strategies for two control loops. In the end the article illustrated the synchronous frequency conversion technology for multiple cooling water pumps system to avoid overload when part of pumps put in operation

Abstract: In this paper, a DNA-PID controller is proposed for a 6-DOF robot. The experimental robot system has firstly been setup. Then the PID controllers of the robot joints are designed. Due to DNA algorithm’s excellent computing characteristics, it is researched and used to set the PID parameters on line, which are the proportional coefficient, the integral coefficient and the differential coefficient. To test the controllers, several experiments are performed. The computer simulation results show that the DNA-PID controllers have faster respond speed and less overshot, which can meet the need of robot control

Abstract: For driving safety on snowy pavement, it is necessary to study on the influence of snowy pavement on driver’s visual characteristics. Based on reasonable partition of driver’s visual field, the data of the number of driver’s fixation and fixation time were surveyed. And driver’s characteristics of fixation were compared on good pavement and snowy pavement. Based on the data of driver’s saccade distance and speed, driver’s characteristics of saccade were compared on good and snowy pavement. It shows that snowy pavement make drivers’ visual field become narrow and it is easy to cause drivers’ visual fatigue which is adverse to driving safety.

Abstract: The AR-Tri-training algorithm is proposed for applying to the abnormal voice detection, and voice detection software is designed by mixed programming used Matlab and VC in this paper. Firstly, training samples are collected and the features of each sample are extracted including centroid, spectral entropy, wavelet and MFCC. Secondly, the assistant learning strategy is proposed, AR-Tri-training algorithm is designed by combining the rich information strategy. Finally, Classifiers are trained by using AR-Tri-training algorithm, and the integrated classifier is applied to voice detection. As can be drawn from the experimental results, AR-Tri-training not only removes mislabeled examples in training process, but also takes full advantage of the unlabeled examples and wrong-learning examples on validation set

Abstract: In order to increase the speed by which the WIM system allows the vehicles to go through from it and improve the precision, the process of the system is analyzed and the physics and mathematics model of the system is introduced. According to the characteristics of the model, adapting the method of adaptive compensation with pole placement to shorten the transition time, and adopt FIR digital filters basing on haiming window function to decrease the effect of disturbance on the system, thus improve the speed and precision of the system

Abstract: In order to ensure traffic safety on freeway, speed limit is necessary. Driver’s safety sense to different speed is not same, so it should be considered by speed limit standard. Through field experiment, the data of driver’s perception speed at daytime and night were obtained. The data at daytime and night were compared. The deviations of perception speed were analyzed under different conditions of driving speed and highway alignment at daytime and night. Driver’s safety senses were classified as four levels of very safe, safe, dangerous and very dangerous. The relation between driver’s safety sense level and perception speed was analyzed. It shows that driver’s perception speed corresponding different safety sense level at daytime and night are also different.