Liu Xiaochu

Engineering quality control of solar-powered intelligent water-saving irrigation

The development tendency of the agricultural irrigation technology is Automatic water-saving irrigation, powered by solar energy and achieved control purposes by moisture content monitoring techniques and the variable irrigation technology. In this paper, we expound the principle of the solar-powered intelligent water-saving irrigation device. We proposed the program to choose solar intelligent irrigation devices based on vegetation height, water flow and etc; and developed the method of arranging the electric probes in soil to ensure that the irrigation systems could provide the water required, without excessive watering. Moreover, we proposed the process of laying and installing the pipelines for solar-powered water-saving automatic irrigation system to reduce the plugging rate of irrigation systems.

Curve Reconstruction of Turbulence Motion Locus Based on Image Projection Transformation and Light Stream Vector

Curve reconstruction method of turbulence motion locus is investigated. Through tracing particles be equally-distributed scattered into flow field and each particle’s movement has been shot from different orientations in continuous time-points, thus sequential conjugate images have been obtained. On the basis of positioning these particles in each relative coordinate system, relationship of image projecting transformation is established to calculate their absolute three-dimensional coordinates in each time-point. Combining with light stream vector, tracing particles’ motion vectors in each instantaneous moment can be deducted. Finally B-spline spatial curve of turbulence motion locus is fitted. Programming experiments and error analysis indicate that the accurate locus curve can be obtained, turbulence’s mathematical feature and motion discipline are clearly displayed, and this method provides theoretical foundation and technical preparation for following turbulence research.

Design and Analysis of Vehicle Energy Absorption Structure with Hydraulic Pressure

Energy absorption structure is important in vehicle passive safe protection, which can absorb the energy as vehicle collision to protect the passenger safety. In this paper, a new type of vehicle energy absorption structure with hydraulic pressure for automotive of middle-mounted and rear-mounted engine, and numerical simulation to optimize for structure of hydraulic energy absorption structure with dynamics mesh technology. The results show that the through-hole structure and opened press is optimized, when the diameter of through hole is 12-14mm, and the opening pressure of the check valve is 5000-6000Pa, the absorbing energy structure being made of the piston cylinder could have good effect.