Applied Mechanics and Materials Vols. 130-134

Abstract: Coal mining had destructed and polluted precious groundwater resources of Cool water Wells coal mine. To more accurately assess the groundwater resources and forecast coal mine groundwater systems status and change trend under state of development and utilization is the foundation work of mining area environment protection and treatment. The paper established the groundwater numerical simulation model in the study area using Visual MODFLOW software, calculated and evaluated the groundwater resources of study area by identification and examination.There are important practical significance to protection preciou water resource of mining area.

Abstract: In the process of connected wind generation with the power grid, the classification and recognition of power quality disturbance signals which are researched by the scholars at home and abroad are always the hot issues in Power System. A new method using Fractional Fourier Transform (FRFT) with Wavelet Entropy is presented for recognizing the signals of PQ disturbance based on the characteristics of power quality (PQ) signals. FRFT have better time-frequency aggregation and can choose better domain instead of and make PQ disturbance recognize more accurately with wavelet entropy. Simulation results demonstrate its effectiveness.

Abstract: The foundation, principle and prior condition and engineering economic Evaluation Criteria of engineering economic analysis are introduced. The economy for a solar energy/air source heat pump system is analyzed. Through a single air-cooled heat pump system, air conditioning in summer + winter heating systems, solar / air source compound heat pump system model analysis and comparison of three systems, integrated initial investment and running costs of both, come to solar / air source compound heat pump system has certain advantages in economical efficiency.

Abstract: Based on the test data analysis and processing which are acquired from a solar energy/air source compound heat pump system in the actual building, the seasonal energy efficiency ratio under the two modes and the energy-saving rate are obtained. Through the analysis of the energy-saving rate, the energy-saving characteristics of the solar energy/air source compound heat pump system under heating condition is discussed in detailed.

Abstract: In order to realize safety, saving energy and material in the design and manufacture of the magneto suction cupule of crane, This text discussed how to select the permanent magnetic material and soft magnetic material, how to design the magnetic circuit and the method of magnetization and demagnetization and so on. It is emphasized on the structure of magneto suction cupule of crane made of AlNiCo and NdFeB permanent magnetic material or the combination of the two kinds of material, the application of RLC circuit in magnetizing and demagnetizing with pulse current to realize the light weight and low cost for the magneto suction cupule of crane.

Abstract: The numerical simulation of reinforced concrete continuous deep beams with opening is analyzed by Finite Element Software ANSYS to establish reasonable mechanical model. The stress characteristics and deformation’s situation of the deep beams with opening are analyzed under concentrated load and different openings in different parts. The purpose is to supply some favorable suggestions in engineering application of reinforced concrete deep beam with openings.

Abstract: The technology of GFRP has received significant attentions in civil engineering due to their unique properties, such as high strength-to-weight radio, good resistance to corrosion and fatigue, convenient to construction and no additional dimension. Study the properties of GFRP confining concrete column through eight groups of columns subjected to axial loading, the effect of width of straps and spacing of straps of GFRP sheets confining concrete column is analyesed. The results are the axial compressive strength and ductility of concrete prism wrapped by GFRP sheets or GFRP straps have all increased to a certain degree, the process of destruction of concrete prism wrapped by GFRP become slower than common concrete prism.

Abstract: The modality analysis of the reinforced concrete supported deep beams with opening is worked out by Finite Element Software ANSYS to obtain eight exponent natural vibration frequencies and modal charts. The result of three exponent natural vibration frequencies is agreement with the result of dynamic analysises. The preceding foundamental work is finished in order to do dynamic analysises and aseismic design of reinforced concrete deep beams with openings.

Abstract: Through a lot of investigations and studies ,and refering to the current related technical specifications and relevant reference, and combining with the characteristics of the ordinary concrete box section component , single box double room concrete huge section box girder which can realize city bridges double traffic is devised creatively,considering of the need of structure and function. By choosing proper element type and material modle, the designed box grider is modeled by the nonlinear analysis software ANSYS. The shear lag effect of the concrete huge section box girder is studied by applying four load conditions including prestressed load, the upper and lower live load and double load. Parameter analysis are done, which include the load type and width-span ratio.And corresponding conclusions are drawn.

Abstract: According to the material properties and the cutting performance of beryllium bronze, research into the various factors of cutting, such as the materials heat treatment, the cutting tool material, cutting-tool angle and the cutting parameters, combined with the actual structure of the workpiece and the overlong deep-hole processing method for study. The test proved that selected reasonable heat treatment , processing methods, cutting tools and cutting parameters can be solved Φ12mm × 4000mm overlong deep-hole processing problems of the beryllium bronze.