Advanced Materials Research Vols. 694-697

Abstract: In the test enginery, using reverse frame put the pulling force into the pressure is the most commonly structure method. This paper analyzed the buckling problem of the process of reverse frame working, established the finite element model , stability analyzed , putted forward and proved the critical condition of reverse frame in the course of stability, Verified in 10kN deadweight force standard machine.

Abstract: Static and dynamic characteristics of grinding machine column structure experientially designed are studied based on finite element models. Then propose structure modifications, analyze characteristics, and select the better one. Study the natural frequency changes in the sensitivity of the wall thickness and rib thickness, and determine the parameters to be optimized. Expert Design software is used to finish experimental design of the parameters, and establish the second-order response surface model. So far a multi-objective optimization model is set up easily. Here using the corresponding ideal point method with relative squared weighting method transforms it into a single - objective one. Some optimal design schemes are received by changing the weight coefficients. ANSYS simulation demonstrates that the result of optimized design is satisfied and the design method is suitable.

Abstract: This article is studied a coal mine waste rock mine shaft steel headframe which is used more than 20 years and the need of the headframe process transformation. The main components of steel headframe (for example: headframe column, beams and bracing) is sampling inspected the geometry and weld size. At last, SAP2000 is used by analyzing the steel headframe the former and after transformation on the basis of the on-site detection. Field testing and theoretical analysis showed that: the main steel headframe and the envelope structure is largely intact and the only part of the rod local area is a certain degree of corrosion, the connected nodes are basically in line with the requirements of the original design; The steel headframe structure which has transformed and components meet the requirements of national norms.The Identification and reinforcement of the project, will provide a reference for future similar projects.

Abstract: In rice processing courses, the working parameters of rubber roll husker, including contact pressure between rolls, inlet flow, fast roll linear speed and linear speed difference, will affect the husker capacity. This paper carried out an optimization analysis based on Box-Behnken experiment design method to discuss the effects of parameters above. The conclusion indicate that if consider rising the husker capacity only, the optimal parameters are: the contact pressure between rolls: 6.18kg.cm^-1; the inlet flow: 173.9kg.(cm.h )^-1, the linear speed of fast roll: 17.0m.s^-1, the linear speed differences: 3.06 m.s^-1.

Abstract: In a sling and hoisting structure consists of seamless steel tubes as hoisting column, bolts and connectors, all the weights are supported by bolted joints. For the bolt joint is located near the end of the hollow column, the position of the holes in sling column have important influence on the loading ability of the structure. In order to study the reliability of the sling structure, the contact stresses between bolts and its connectors are calculated theoretically and by using FEM (finite element method), and the optimum position of the holes are determined further.

Abstract: Sandwich panels with a V-type corrugated core are developed to investigate their crushing performance under lateral load based on the numerical method. The validity and feasibility of the calculation method is qualified by comparing numerical results with experiment results. Based on that, finite element software is applied to analyze the effects of structural parameters on the crushing performance of sandwich structure. Then inspecific energy increases as the core thickness and inclination angle are increased, but it will induce as the core height is raised. Additionally, the average crushing strength is increased with the increasing thickness, but it will decrease as the core height and inclination angle are raised. The results of this research may help the practical design and optimization of sandwich panel with corrugated core.

Abstract: The natural frequency of cantilever micro-beams is solved analytically on the basis of modified couple stress theory. The governing equations are obtained by a combination of the basic equations of modified couple stress theory and Hamiltons principle. The size effect on natural frequencies of the cantilever micro-beams is analyzed. It is found that the natural frequencies of the cantilever micro-beams predicted by the newly model are size-dependent. The difference between the natural frequencies predicted by the newly established model and classical beam model is assessed.

Abstract: Taking a certain type of heavy duty apron feeder inmobile crushing station as the object of study, this paper proposed a five-barmechanism to research the velocity fluctuation problems of chain drive systemin an apron feeder. The effects of impulsive loads were analyzed, and amechanics model of meshing area was proposed. The research results are asfollows. 1. In the conveying direction, the number of teeth and sprocket pitch hasthe most influential effect on the vibration. 2. External impulsive loads causea significant increment of chain force, in particular the loads caused by largematerials. 3. The teeth and rollers near the tight-side chain play a major rolein transferring the torque, and the initial pressure angle affects their stressconditions immensely.

Abstract: We present a method determining analysis of workflow of the planetary vibroexciter, allowing by constructing three-dimensional graphs obtained in MathCAD, combine several line graphs in one. Improves the availability the results of theoretical analysis, the influence of the main parameters of the vibroexciter on its dynamic characteristics. The use of a planetary vibroexciter with elliptic inner race gives substantial advantage in generated driving force against an analog vibroexciter, equipped with a round inner race with the same dimensions and initial parameters. Selecting the mode of setting the spider axis of a planetary vibroexciter in one of focal points of elliptic inner race leads to the increase of generated driving force, 2.2 times on abscissa axis and 2.4 times on ordinate axis, against the central position of the spider axis. This proves the effectiveness of the elliptic planetary vibroexciter use. 1.6 times increase of focal length results in directly proportional increase of driving force projection on ordinate axis, and 2.1 times increase of driving force projection on abscissa axis.

Abstract: In the process of bogie separation device operations, rotating system is required to push bogie and settlement beam to rotate . After the completion of bogie wheel replacement and maintenance, they need to be pushed back to original position. This paper explains working principle of rotating mechanism of monorail vehicle bogie separation device and performs co-simulation and analysis of rotating mechanism based on ADAMS/MATLAB. Analysis results show that the rotating hinge mechanism and its proportional control system can completely meet the requirements of the rotary motion.