Advanced Materials Research Vol. 1021

Abstract: The composite beam is efficient and easy to construction. But deformation capacity is degraded with thickness of bottom tension plate. The composition ratio by shear connector have a decisive effect on deformation capacity. This research evaluated the flexural strength and deflection with variable of thickness and protrusion length. The effect of composite ratio and shear connector was analyzed through fracture behaviors and distribution of strain through two point loading test.

Abstract: Applications of stress concentration type cable in engineering are very common, but in some relatively weak rock and soil layer, it does not meet the requirements of bearing capacity. In addition to lessen the anchor cable anchorage length, we choose to use stress-dispersed anchor in many engineering^[1]. In order to study the tensile anchorage segment bond distribution, this paper uses FLAC3D through changes in the design of foundation pit supporting anchor cable anchorage segment bond strength of the grouting body, analyzes the cohesive force in theanchorage segment of distribution and the size of the cohesive force peak.

Abstract: The structure of the dynamic characteristics can comprehensively reflect the seismic performance of the structure. By high sensitivity under external excitation vibration pickup pick structure dynamic response to obtain the dynamic characteristics of buildings, this paper introduces the principle of vibration test and modal identification method of information. To high-rise shear wall of reinforced concrete frame structure of a residential building as an example, has carried on the test, through the test results of the seismic performance of this structure after reinforcement.

Abstract: Building construction usually delay by various kinds of reason during construction and equipment installation process. It maybe cause total duration to be delayed by one work delaying, also it maybe not affect the total duration. It depend on nature of the work and time delayed above the two situationgs. Firstly activity-on-arrow network is introduced in the article, secondly critical path and total float are analysed, then we have controlled and analysed the construction progress by using total float in the actual projection, finally we have made the conclusion.

Abstract: this article is to use AT89C51 single-chip microcomputer control of intelligent speed measuring instrument. Motor in the process of operation, need to be monitored, speed is a necessary one parameter. This system is carried out on the motor speed measurement, and can be conducted and PC communication, shows that the speed of the motor, and observe the basic condition of the motor running. Mainly USES AT89C51 as the control core, by hall sensors, LED digital tube, the NE555, L298N, operational amplifiers, etc. SCM measuring speed system was introduced in detail. Give full play to the performance of the single chip microcomputer. The focus is on measuring speed and display. Its advantage is hardware circuit is simple, software function is perfect, measuring speed, high precision, reliable control system, the characteristics of high performance-to-price ratio.

Abstract: This paper proposes how QFDs, TRIZ integration with FMEA may arise, and making the control valve in the design concept and manufacturing development stages to amend the main issues to have front-end prevention. In order to eliminate the conflicting requirements and to build the front-end prevention of the design and production process that will meet customer needs and translate customer requirements into measurable technical requirements, the innovative model integrating three tools is proposed. One case is given to illustrate the research steps for the proposed model that will demonstrate the design quality and achievable resource benefits when these three tools provide product developers with more useful information and precise analysis results.

Abstract: In order to ensure the safe operation of the ship in the medium-voltage grid, transformer protection is particularly important. Using Matlab/Simulink, this paper established transformer and its differential protection simulation model of the medium-voltage ship. To achieve differential protection function, this paper uses the M-file to program the differential protection S-function. The simulation results indicate that the differential protection models can achieve their protection functions and have better quick-acting and stability.

Abstract: . In order to meet the needs about collecting the soil containing tree species, we designed an automatic cutting machine which can receive loam containing seeds and used in the forest loam. Features of this machine are the application of the chain plate knife, not only can hierarchical cut loam containing seeds, but also will transport the loam to the collecting bag. In the design process, through building a mathematical model about the chain plate knife cut soil, Analysis of the resistance of working, and get the relationship between the overall level of resistance and the working width. The experimental results show that the machine is easily to be operated, can highly efficient cut soil, and it’s suitable for use in the woodlands.

Abstract: A new method of mechanical vibration assisted induction heating hot-pressing was proposed. A set of apparatus was developed to perform the forming of mechanical vibration assisted induction heating hot-pressing. A series of experiments of induction heating temperature characteristics of different kinds of powder was carried out, such as Fe powder, Al powder and SiC powder. The results show that different kinds of powder reach different equilibrium temperatures and have different temperature characteristics under the same condition of setting temperature and cyclic heating times. SiCp/Al composites were prepared by induction heating and vibratory forming and observed by metallographic microscope. It turns out that completely dense and homogeneous powder metallurgy compaction is compacted and sintered at the same time by the method of mechanical vibration assisted induction heating hot-pressing with low pressure and short time.

Abstract: Abstract:Although high power LED is not large to replace the traditional lighting lamps and lanterns, but they are in indoor and outdoor decoration, special lighting is more and more widely used, so master the design of the high-power LED constant current drive technology, is very important to open up a new application of high power leds. LED by power and luminous brightness can be divided into high power LED, high brightness LED and common LED. In general, the power at least above 1 w high power LED, is more common with 1 w, 3 w, 5 w and 8 w and 10 w. Has large quantities of application are 1 w and 3 w LED, as w and 5 w, 8 to 10 w LED application is relatively small. Electronic and lighting industry are extremely concerned about the development and application of new technology of LED lighting. Constant current driver and improve the optical efficiency of LED is the two key problems of LED application design.