Applied Mechanics and Materials Vols. 130-134

Abstract: As mining production developing, the deformation is gradually increasing in the northwest side of the surface mine. The blasting vibration of daily production is influence on the slope. Through decomposing, restructuring and analyzing the blasting vibration signals of different elevations and explosion distances, we got that the seismic wave energy was mainly distributed low frequency range, usually less in 20Hz and that with the explosion distance increasing, the high-frequency signal energy would be lost, especially when low-frequency signal energy below 10Hz low-frequency become into the main part of the energy. As explosion (center) distance increases, the signal energy is concentrated in the low frequency. Whereas, with the elevation increasing, the seismic wave energy will move to high frequency and has a homogenizing tendency; the percentage of the low frequency energy will be decreased relatively.

Abstract: The formation resistivity is a main parameter in logging interpretation and evaluation of oil and gas reservoir. And high resolution three-lateral logging is an important measuring method in resistivity logging. According to the present finite element program for three lateral logging concludes data and the powerful graphics capabilities of MATLAB, we study the relationship between potential or current and focusing characteristics. The results are important for how to design equipment parameters, and control the current focus to achieve the best focusing.

Abstract: At present，large scale and space coordinates measuring system with wide-range and high-precision has been widely used in modern manufacturing industry. In this paper, large scale measuring method based on leapfrog principle of flexible three coordinate measuring machine is described. The mathematical model of coordinate transformation is built and the general coordinate transformation formula after number of times leapfrogging is derived. The best positioning and each step of leapfrog are given.

Abstract: A new attitude controller is proposed in this paper considering variable flywheels output torque saturation limit. Control model is discussed while the time-varying and state-dependent torque saturation limit is derived. The new controller is similar to linear assignment of torque limit and covers attitude feedback information. With Lyapunov method, the asymptotic convergence of controlled system states is proved. The auxiliary parameter contained in the controller is guaranteed to be bounded to make sure that the control objective can be achieved. All of the simulation results validate the analysis and controller.

Abstract: The paper studies the relationship between axial force and breadth of back blade by numerical simulation and experiment. On the basis of the RNG k-ε turbulence model and technology of compact local grids and regional computing, three dimensional numerical simulations to 100HZ165-250 centrifugal pump with various breadths were carried out. Through comparing and analyzing of the flow field, it can be seen that the axial force reduces with the increase of the back blade breadth. After that, the simulation results were verified by the experimental data got from different test devices, and it shows that the conclusions are reliable.

Abstract: The design practice and simulation as well as implementation of a flyback converter are presented in this paper. Detail design considerations for each component in flyback converter are addressed and discussed. Based on the simulation results, a flyback converter is then realized and implemented. The experimental results show the verification for the design and implementation of the flyback converter. This paper concludes that the design of a flyback converter based on the proposed design practice, can reduce the development schedule duration and further alleviate the human resources need.

Abstract: With the social rapid development, the earth's limited primary energy such as coal, oil, natural gas etc will be exhausted; energy problem has caused worldwide widespread attention. Therefore, under the development of renewable energy, without exception, each country is actively trying to explore the new theory and using energy-saving and technology to improve energy utilization ratio and reduce the energy consumption and the harm on environment. Scientific analysis of energy saving is an important link of digging energy saving potential, effective energy analysis method plays a pivotal role in implementing saving energy. This paper summarized several energy analysis methods on the basis of the first and second law of thermodynamics, introduced the most widely used enthalpy analysis method, entropy analysis, exergy analysis and exergy economic analysis which are based on the second law of thermodynamics, introduced emphatically the specific consumption analysis theory development with exergy analysis and exergy economic analysis.

Abstract: Under the control of energy efficiency model C, design unite (DU) changes function F to state S through design progress P. Thus, the target of energy optimization is achieved by gain the F in a lower cost of energy. In order to make energy efficiency model C used in design progress more easily, the EDF’s optimization target T and energy consumption influence modulus M is added to C. In the process of energy optimization axiomatic design, DU changes the initial customer’s requests to product’s physical modules in a decomposing process and its content is transformed from asthenia to sthenia. DU’s function F is decomposed and defined at the guidance of independence axiom. And the optimal solution is selected at the operation of information axiom and energy efficiency model C. By the end of this paper, the contrast of energy optimization degree in each design stage is detailed.

Abstract: Pursuing the green design (GD) of products is highly beneficial in the alleviation of environment burdens. In order to gain such benefits, GD is involved in entire product lifecycle. During the product lifecycle, energy-saving is one of the main roots of environmental pollution, with the optimal calculation of the total energy consumption for GD being an important path to reduce the environmental pollution. The objective factors of decision-making problems in the traditional product design are usually three: life、quality and cost; but from the viewpoint of GD, energy consumption should also be considered. Energy design factor (E) is the essential coefficient of the model of the energy consumption throughout the entire product lifecycle. In this paper, a multi-object decision-making model of energy-saving design for GD is put forward, in which the objects of life (L), quality (Q), cost (C) and energy design factor (E) are considered together. A case study on a decision-making problem of energy-saving design in the design process of a machine tool’s transmission is analyzed, the result showing that the model is practical.

Abstract: This paper describes a systematic way to apply the functional safety standards IEC 61508 and IEC 61511 on the safety management of a chemical process tank. After a short introduction of the basic principle of the functional safety philosophy the risk based determination of the safety integrity level (SIL) for a special liquid tank application is given. Then a safety instrumented system (SIS) suitable to the SIL-level 2 has been designed to fulfill the qualitative and quantitative requirements in the safety standards. The experience gained can be seen as a guidance for process and I&C engineers in industrial practice.