Key Engineering Materials Vol. 522

Abstract: There is a difficult technology problem of high-pressure differential multi-layer separate injection, which had given birth to after using the technology of water injection in the process of oil extraction, the electrical control type water distributor has been designed for the solving of this difficult technology problem. The dynamic characteristics for the executive body of electrical control water type distributor had been studied based on the technology of virtual prototyping and the theories of multi-rigid-body kinematics and modal analysis. The three-dimensional model and dynamics model had been established firstly using UG software, then the kinematics analysis and modal analysis of its key components had been simulated using ADAMS software, its kinematics discipline and natural frequencies and vibration modes have been simulated at last. Therefore, the simulation results provide theory data for its structural optimization design.

Abstract: In this research, 2D and 3D FEM model of one stringer of a semi-trailer was built. Mesh generation and boundary conditions definition was processed on FAST software. Effective stress distribution diagram was obtained after FEM analysis to stringe structure under various working conditions. Main stress concentration area was defined and causes for stress concentration was analyzed. After all, suggestion for improvement and structure optimization was given.

Abstract: This paper on wind generator set transmission had a simple introduction, and lumped-mass method was used on the planetary gears of transmission dynamics analysis, the conclusions were drawn that the different planetary gear in the direction of the force and deformation, the main conclusions are as follows: (1) Resonance are a great influence on the dynamic load of the planetary gear train; stiffness the greater the amplitude value of the system dynamic response to the volatility of the more serious, more bad vibration; (2) Simulation results show that, and mechanical impedance analysis based on the state variables, can be carried out on the vibration system time domain and frequency domain simulation, provides a convenient and effective method for kinetic analysis of the vibration system. so as to improving the quality of the design of wind turbine drive system provides a theoretical basis.

Abstract: This paper on wind generator set blades had a simple introduction, and the modal analysis was used on the blades dynamic analysis, the conclusion that blades the different stage in the direction of the force and deformation was drawn, it can be concluded: the first three-order natural frequency at, the blades are expressed as a pure bending vibration. It can be seen from the blade vibration figure: a frequency of blades waving in the direction of the first natural frequency, first natural frequency of the second-order frequency blades shimmy direction, three frequencies for the blades waving direction of the second-order natural frequency, torsional frequency of fourth order for the direction of the shimmy, five order of frequency of blades placed waving direction of the three natural frequencies. According to the theory of vibration, the vibration in the process of energy is concentrated in bands 1 and 2, so the first stage waving vibration (bending vibration) is the main vibration of the wind generator set blades; 4 and 5 vibration modes performance for bending dominated accompanied shimmy and torsional vibration. Visible, the shimmy vibration and torsional vibration in high-end part is still not the main vibration.It provides the theoretical basis so as to improve the quality of the design of wind turbine blades. Blade is one of the wind generator set key components, many aerodynamic problems are faced, the aerodynamic efficiency of the blades is to be considered an important factor in the blade design, and their job security is more important factor. The wind turbine power source is the natural randomness of strong wind, the blades often run in the stall condition, the system has a strong stochastic dynamic process, the transmission of abnormal is irregular power input, the main structural components to withstand higher than normal rotation mechanical fatigue loading several times, forming a unique wind turbine dynamics. Wind generator set blades as a flexible structure, the load acting on has a cross and random variability, which is an inevitable occurrence of vibration, the vibration characteristics of their study is very necessary. Blades the structure and strength of the wind generator set reliability plays an important role. With the emergence of high-power wind generators, finite element numerical analysis of the theories and methods have been applied to the structural design of wind generator set. Modern wind generator set blades shape and internal structure complex calculations,it is necessary to study the exact dynamics model and the analysis of blades structure [. The institutional dynamics is to constitute the institutional elements of the inertia and institutions in the rigid parts caused by the vibration of a subject. The kinetic analysis features include: regular modal complex eigenvalue analysis, frequency and transient response analysis, (noise) acoustic analysis, random response analysis, the response and the impact of spectrum analysis, power sensitivity analysis. Here only the blade to vibrate and modal to be analysed [.

Abstract: In order to respond quickly to meet market demand of crushing machinery, shorten development cycles of products and reduce design cost, rapid design system is introduced. According to the features of crushing machinery and the division method of product modules, interfaces have been studied and proposed using the theory of generalized modular design and flexible module instead of traditional module. The general structure of software is put forward by analyzing the design procedures. A template database, an example database and pars database are built using Visual Studio 2008, Sql Server 2000 and Solidworks. In this article, an example is used to verify its feasibility.

Abstract: This article does research on 4MSC-3000 cotton picker transmission system thorough. It establishes transmission system dynamics model and vibration differential equation, ADAMS virtual prototyping technology is used to do simulation on the transmission system. Kinematics relations and dynamic characteristics of the transmission system are found out. Through the dynamic analysis of the model to solve, we can get kinetic curve of gearbox, each axis, gears and so on. Then provide the necessary theoretical basis for follow-up prototype design.

Abstract: This paper takes a kind of 14 mm inner diameter, installation span for 600 mm conduit connector as an example to do the top 5 order modal analysis, resonance resistance analysis and random vibration analysis and gets the vibration model in the different frequency.

Abstract: Setting up the FEM model of a spacecraft catheter connector, analysis its static strength and optimized its structure, Shorten the diameter and reduced the weight of catheter connector, within the requirement of properties.

Abstract: This research based on the vapor-liquid two-phases flow theory and methods, by using the CFD mix-multiphase flow model, the seal cavity vapor-liquid two-phases flow field for the bellows cartridge mechanical seal under such the high-temperature, high-pressure, high-speed as complex working conditions was numerically simulated and analyzed, then the characteristics of the complex three-dimensional flow field of seal cavity caused by the rotation of the sealing ring were obtained by the different position of the injected coolant, and the different cooling effects were contrasted, then the best cooling position were found by analysis. The researching results provide a theoretical basis for the structural optimization design of the high parameters bellows cartridge mechanical seal devices.

Abstract: In this research, by based on the computational fluid dynamics (CFD) numerical theory, using the Standard-Turbulence model and the Standard-Wall function, the fluid-film between the clearance of the sealing ring friction pair for the bellows mechanical seal under such the high-temperature, high-pressure, high-speed as complex working conditions was numerically simulated, the pressure fluid and the relationship of the carrying-capacity of the fluid-film between the pressure inlet of seal cavity and the width of the fluid-film, and the results of the numerical analysis was compared with the theoretical value. The researching results provide the scientific basis for the optimization designing of the high parameter bellows mechanical seals.