Applied Mechanics and Materials Vols. 385-386

Abstract: The water diversion project from Luanhe River to Tianjin is a large-scale project, which solved the water shortage of Tianjin city. Because the long water supply open channel along highroads, the traffic emergent incidents bring great potential dangers to the water supply of Tianjin. In this paper, the prediction model of traffic emergent incidents in YinLuan River Open Channel was built and the transferring of pollutants under typical scenes was simulated by EFDC model. The evolution and affective area of pollutant in open channel was obtained. The results provide a scientific basis for the decision makers to take effective measures.

Abstract: Numerical simulations of pressure loading effects on occurrence of rock lateral cracks under confining pressure were performed by using the numerical analysis software. The results indicate that the rock tends to have median cracks with the increasing of penetration under no confining pressure, while the rock tends to have lateral cracks with the increasing of penetration under confining pressure. The relative position of lateral crack initiation is dependent on the confining pressure when loading, which is independent of the penetration. The greater the confining pressure, the closer the lateral crack location to the rock surface. With the increasing of penetration and confining pressure while loading, the lateral crack direction is towards to the direction parallel to the rock surface.

Abstract: In order to numerical simulate the transition process from continua to discontinua and even to structural collapse,the collapse of bricklaying arch built by two-layer stone material is analyzed based on the deformable distinct element method (DEM).The simulation results are consistent with that of experiment. The research results shows that not only the load-displacement response of the arch under uniform fracture energy can be appropriately predicted through the method, but also the collapse behavior when the system partially or completely reaches failure can also be simulated

Abstract: This paper adopts the program Ansys and its secondary exploit platform tools to construct three-dimensional model to simulate the destroy process of cave depot. The method that damage surface and yield surface are dealt separately, and dispersion model is forward to simulate flaws. And the results of numerical simulation have been debated to find the laws of flaws growth and distribution with increasing of explosion pressure. It can be found that with the the linear increase of explosion pressure, flaws and distribution regions of flaws grow and expand. Tension flaws are precede to shear flaws. Flaws regions appear in the order , namely, the center of the arch--arch foot-- flaws in the center arch propagation - flaws in other else regions propagation. The research result has important value for online monitor, maintain and reinforce of cave depot. And the technology that has been forwarded in this paper also supplies for the numerical simulation researcher.

Abstract: Through new 3-D seismic data and the technique of coherent slice, the development characteristic of layer-bound polygonal faults (PFs) is summarized in Zhaozhou oilfield in the south of Sanzhao sag, Songliao Basin. the layer-bound faults that show preferential alignment have lengths of 1503000 m, throws of 510 m, most strikes parallel to the slope direction and aligned faults are antithetic to the bedding dip. PFs activity coincided with a late K₂qn to early K₂y stage tilting event, gravity sliding model is proposed as a possible mechanism for the deformation.

Abstract: The rock porous structure properties, mechanical parameters and drillability of Haita areaby using Rock slices test, compressive strength test and drilling pore structure characteristics, rock pore structure having good fractal properties was found, the fractal dimension could reflect the rock pore of the development and distribution characteristics, and have the great impact on the physical and mechanical properties of rock and drilling resistance.

Abstract: The paper inctroduces the guide for the design of a portable instrument for straightness measurement of large machine tool. the measuring instrument is designed with two-quadrant photocell which is used as the position sensor, single-chip for the processor is MSP430F427 which have LCD driver circuit, the instrument is charged by lithium battery-powered. Its size is small, no external connection when it is used, data acquisition, processing and error displayed can be done in the part of light target. It have the advantage of convenience, simple and high measurement accuracy when it is used.

Abstract: Aiming at the problems of flare gas flow monitoring on offshore oil platform, a flare gas flow measurement system is designed. This system is integrated in the whole flare control system and reaches the effective monitoring of flare gas flow. Besides it adopts ultrasonic flow-meters for the more accurate flow-meter data and adopts hot-cap method for the realization of being installed without halting production. Results indicate that the design could offshore oil platform improve the efficiency and safety of production in offshore oil platform.

Abstract: Traditional fighter electrical boxes detection system can not be efficient and accurate implementation in detecting electrical boxes, in order to achieve accurate detection of the electrical box, this paper had designed a detection device consists of upper machine and lower machine system. The system is based on the C8051F120 single chip microcomputer as the core. It is controlled by a machine on and off of the FPGA to drive the relay array to detect the safety status of electric box, through the communication between upper machine and lower machine to display the measurement results. The integrated test system can detect various fighter electrical control boxes, which overcomes the shortcoming of a test equipment in the past can only test a class of products, improves test accuracy and efficiency.

Abstract: Micro-irrigation sprinkler irrigation uniformity coefficient is an important indicator of measuring the irrigation uniformity of micro-irrigation system and is an important parameter of micro-irrigation nozzle design. In order to test micro-irrigation sprinklers irrigation uniformity coefficient precisely, micro-irrigation sprinkler irrigation uniformity coefficient precision test-bed was developed. Test-bed can measure some parameters, such as on-site temperature, pressure, total flow, sub-flow and measurement time accurately. Collecting data through the data collect network. Multi-chip acquisition card is connected with RS485 bus and is connected to the host computer by numerical control system specially developed. The task of numerical control system is to process preliminary collected data, transfer the data to host computer, and coordinate with host computer to complete the task of control. It can also complete the several of control functions independently. Experiments show that the test-bed is reasonable designed, easy to operate and has a high test accuracy.