Advanced Materials Research Vol. 462

Abstract: The LS-SVM(the least square supporting vector machine) model of tar removal process by catalytic cracking in corn straw gasification was established according to the experimental data in [2]. On this base, a multi-objective optimization function was put forward, by which the Pareto-optimal solutions were gained in a single run. From the perspective of engineering optimization, the efficient solutions that are suitable for power generation and gas supply were selected respectively from the Pareto-optimal solutions by analysising different demands for gas.

Abstract: To improve the detection performance of dynamic object tracking system that cannot work normally at night, the infrared detection technology is put forward to design and study its detection tracking system. According to the characteristic that projectile can produce heat radiant energy when it flying, the surface projectile was divided into small unit area independently to calculate its infrared radiation energy, its heat radiation temperature equations were established, the method of four-order runge-kuta was applied to analyze and calculate temperature parameter. The relation between atmospheric attenuation and detection performance was analyzed in dynamic object tracking system. Through calculating and analyzing, the theory of infrared radiation technology meets the need of dynamic object tracking system.

Abstract: In order to investigate the law of electromagnetic propagation within microwave heating system, Maxwell's equations are applied to build electromagnetic model of recycled asphalt mixtures. Energy distribution of electromagnetic field in asphalt mixtures is researched based on the Poynting theory. The optimization model of electromagnetic field and structure are established by building relationship between electric field and magnetic field. Experiments of microwave heating allochroic silicagel are performed, which demonstrates the accuracy of electromagnetic field optimization.

Abstract: Aiming at the problem of path planning of soccer robot, based on the principle that the path curve should be smooth and the total length of the path should be short, the fuzzy control method to the whole velocity and the real-time rotational angle was proposed in this paper. The membership functions of fuzzy controller were optimized by golden mean principle. Simulating use the fuzzy control method and the fuzzy control method based on golden mean. Results show that the fuzzy controller optimized by golden mean has better control effect. Robot has better real-timing when avoiding obstacles. The global path will be shorter.

Abstract: New ways of improving the property of the piezoelectric fluidic angular rate sensor are described in the paper. According to the improved schemes of the structure and the process, the repeatability of null voltage, the cross-coupling and stability of the sensor are improved. The numerical results have shown that the repeatability of null voltage increases from 0.2°/S to 0.1°/S and the cross-coupling decreases from 2% to 1%.

Abstract: Virtual Reality technology is wild applied in various fields with its development. This article studied the application of virtual reality technology in green construction. On the discussion of the utility of desktop virtual reality system to accomplish the three-dimensional real-time simulation of green construction project, it shows that the application of virtual reality technology in the simulation of green construction not only reduces the construction cost but also breaks the limitation of time and space. The research of this paper has very high applied value.

Abstract: Aiming at the vibration test of the power train mounting system of certain light truck, a vibration test is performed, and vibration response at each testing point of the system is obtained in different conditions. Data is processed based on Matlab software, to display the time domain and the frequency domain response in an image way in each testing condition. The energy transfer efficiency of each mounting point, the vibration frequency domain response property, and the vibration intensities of the variable-speed joystick and the steering wheel in three directions are analyzed, a parameter design optimize proposal on the mounting system is proposed, and the vibration isolation effect can be improved by reasonably selecting parameters.

Abstract: Timeliness and accuracy is a key to be resolved on robot binocular measurement. In this paper, a kind of robot vision projection has been completely established. It analyzes the principle of binocular ranging in three aspects, makes the calculation concise and easy to understand, and expands the range of effective distance. On binocular image processing, we have proposed a gray-scale computing for, firstly, generating characteristic area, then, executing template matching in the area, finally, extracting feature points and matching them in the templates. It ensures certain robustness to noise spots and tries its best to avoid mismatches. The experiments show that the robot vision system has a better accuracy and a low time complexity, and the robot can react in real time.

Abstract: In this paper, an approach to multi robot exploration is presented. One of the key issues in multi robot exploration is how to assign target locations to the individual robots and how to better distribute the robots over the environment. The proposed technique applies a well-known unsupervised clustering algorithm (k-means) in order to fairly divide the space into as many disjoint regions as available robots. Hungarian Method is used for the assignment of robots to the individual regions with the task to explore the corresponding area. To drive the robots around the environment, a frontier ‘regions on the boundary between open space and unexplored space’ based navigation strategy is used to decide where to move next, according to the data collected so far. Furthermore, we discuss improvements to the frontier based exploration strategy, by pruning the frontier cells that further reduces the computational time. The numbers of candidate locations are evaluated based on three criteria: number of unknown cells, number of known cells and real path travelling cost. Simulations are presented to show the performance of the proposed technique. This method can best be applied in search and rescue operations, partitioning helps to explore different regions of the workspace parallely by different robots instead of concentrating efforts in particular spot, pruning helps to make movement decisions much faster, the result is that the potential victims in a region will not have to wait much longer.

Abstract: To measure the concentration of CH4, we developed a thin film piezoelectric acoustic sensor (TFPAS), it accomplishes the detection of CH4 by the absorption of CH4 which can change the oscillation frequency of the piezoelectric crystal. The sensor is mainly composed by the piezoelectric film, sensitive film, silicon substrate and electrodes. The sensitive film is made up of nanometer-sized MgO scattered on pitch-based activated carbon fibers which has a strong adsorption of CH4. The piezoelectric film is a ZnO film which has very high piezoelectric characteristic parameters. The experimental results show that the sensitivity of the sensor to CH4 is very high. The response of the sensor to the presence of CH4 tested was found to be linear within a certain detection range and the detection error is less than 5%.