Papers by Keyword: Bionic Structure

Abstract: With analysis of the phenomenon that clay adsorb to the caterpillar surface, a new idea focused on improvement in the surface topography of caterpillar to decrease adhesion of clay is presented on the basis of inspiration from the biological hydrophobic phenomenon and perspective of bionics. The surface topography with papillary structure of caterpillar surface is designed on the basis of Lotus-leaf-likes surface with analysis of its microstructure in accordance with similarity principle. The new structure could effectively prevent clay from adhering to caterpillar surface. A model of the new structure is also built.

Abstract: The geometrical shapes of some animal organs have distinguished functions and properties that can provide useful information for bionic engineering applications. Hence, it is necessary to quantitatively measure the geometrical structure of those animal organs. However, some of the animal organs are tiny, complex and in the Meso-scale (0.1~10 mm). Their potential bionic application requires an accurate and efficient method to quantitatively analysis of their geometrical shapes. But existing methods are difficult and inefficient to quantitatively analysis. Yet, it was found that MATLAB image processing and computer vision technique can be advantageously exploited to obtain outer margin geometrical information from stereomicroscopy photograph. In this work, based on MATLAB, a program was designed and a method was proposed that specified for extract meso-scale animal organ outer margin contour points. The procedure for obtaining quantified geometrical information can be conclude as that stereomicroscope image of bionic object animal organ was prepared, the image to reduce noise interference was processed, the outer edge contour points was detected, and the points x and y coordinates data to computer database was stored. The foreleg of dung beetle Copris ochus Motschulsky, which is with special tooth-like structure for burrowing, the height of the end tooth is only around 1 mm and the width is about 0.5 mm, supported by this method, the outer edge profile of the foreleg end tooth was extracted from stereomicroscopy image with 669 × 727 pixels, about 1500 outer edge contour points was obtained, points x and y coordinates data were inputted to computer database for further analysis. This method is efficient, accurate and easy to adapt to quantitatively analysis of geometrical characteristic features of other animal organs in meso-scale.

Abstract: The bionic structure nanoporous TiO₂ materials were prepared using aquatic plants as biological templates. The X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), nitrogen adsorption method and ultraviolet-visible light spectrometer were employed to characterize the structure of samples and the degradation performance of methylene blue solution under the visible light. The results showed that TiO₂ sample inherited the porous structure of original template. Such bionic material was composed of ultra-thin piece layers which were full of TiO₂ nanoparticles with size of about 10 nm. The product was studded with piled pores which had a few to dozens of nanoaperture. The material was doped with a small number of bionic legacy elements which can enhance the absorption of 400-800 nm range of the visible light, thus the bionic nanoporous TiO₂ materials had better photocatalytic degradation effects of methylene blue solution in the sun.

Abstract: Aircraft fuel tank leakage is a very common maintenance problem. A snake-like robotic detector was designed for troubleshooting leaks of fuel tank which has strong constraint and is also explosive. The robot has several flexible sections based on bionics, and it can achieve actuation redundancy by independently pulling its four driven cables to carry out a bending motion of two-degrees of freedom. A solution framework was established among the cables length, angle and tip coordinate of single section by projection curvature and coordinates transformation. The decoupled kinematics equation between the multi-sections was deduced based on the analysis of single-section kinematics. Finally the correctness of the kinematics method was demonstrated by prototype testing.

Abstract: A novel MEMS vector hydrophone with bionics structure was introduced in 2007. As the acoustic-electric transducer infrastructure has been optimized, the performance of the hydrophone has been greatly improved compared with the previous. This hydrophone calibration was finished in National Defense Underwater Acoustics Calibration Laboratory of China. According to test results, the sensitivity of the hydrophone is -165dB（including pre-amplification 20 dB）,The frequency response ranges from 20Hz to 2kHz (±5dB). And this hydrophone has a good directional pattern in form of "8"-shape.

Abstract: A novel MEMS vector hydrophone with bionics structure was introduced in 2007. As the acoustic-electric transducer infrastructure and the acoustic package of hydrophone have been optimized, the performance of the hydrophone has been greatly improved compared with the previous. This hydrophone calibration was finished in National Defense Underwater Acoustics Calibration Laboratory of China. According to the test results, the sensitivity of the hydrophone is -165dB（including pre-amplification 20 dB）, the frequency response ranges from 20Hz to 2kHz (±5dB). And this hydrophone has a good directional pattern in the form of "8"-shape.