Applied Mechanics and Materials Vol. 312

Abstract: To make optimal design of case ejector mechanism easier and more efficiency, a novel method based on kinematical simulation and combining modern computer technology with the features of traditional linkage design is presented. By analyzing transmission state of double-rocker mechanism of ejector, establishing a kinematical simulation model and determining the appropriate data of the mechanism, a designer could easily design a case ejector satisfying all the requirements on movement or trajectory in the given conditions. Meanwhile, the transmission factor of the mechanism is highly increased. The results from optimal design of the case ejector of certain type of tank show that the transmission factor of the mechanism is increased by 58.4%.

Abstract: In order to control the temperature of the ink, a cooling roller is used to cool down the temperature of the blanket cylinder. The calculation of the heat transfer on cooling roller is divided into two parts: One part is the exchange heat with the air through the cooling roller and the blanket cylinder, the other part is the heat conduction of the cooling roller and the blanket cylinder on the contact area. The heat conduction on the contact area is divided into the thermal conductivity generated by the friction and the heat conduction from blanket to the cooling roller.

Abstract: Based on the background of cushioning package design for the wine bottles, the analysis on the cushioning properties of honeycomb paper core is presented. The reverse design method based on the function relationship of cushioning package is proposed, to make the cushioning structure design and cushioning dimension design as well as the buffering pad checkout, including strength check, deflection check and creep deformation check to make sure design meets the requirements. The function relation of the maximum acceleration and static stress between arbitrary dropping height and thickness of cushion is obtained. The reverse design method can obtain any curve of any dropping height and any cushioning thickness through several experimental tests. The flexibility, what is more important is that the method can greatly reduce test time, saves the cost of enterprises and technology research & development. The method provides a new way to the cushioning package design.

Abstract: The force situation of truss legs has an important impact on the jack-up offshore platform. The finite element analysis on three types truss leg was made, and the stability of the three types truss leg under preload, operating and storm survival condition was discussed. The result showed that the maximum stress was in the chord; they met the design requirements; K type, inverse K type can save material, and they both met resonance requirements. The former had a better stability under preload condition, and the later had the best stability under operating, storm survival condition.

Abstract: The aim of this study was to revealed the top-notch gymnast Kai Zous dismount of double salto backwards stretched with 2/1 twist. The findings showed that (1) at flight phase, (a) kinematics parameters had slightly different at off-bar moment in 2011 and 2012, (b) flight posture fitted with gymnastic rules, (2) at landing phase, (a) the lower limbs of Kai Zou didnt stretch, it was unfavorable for the following buffering, (b) his hip joint angle was smaller and knee joint angle was larger after landing in 2012, and these were favorable for the finish of buffering element, it will increase the horizontal distance of C.G. and improve stability of landing, (c) mean hip joint angle was 117.9o at landing, the buffering time was 0.215s.

Abstract: Discussing the mechanics mechanism of bolt reinforcement of joint fissure test pieces with the method of Variable angle plate indoor model experiment, analyzing the deformation of bolt control of jointed slope combined with the numerical simulation. The results show that: the bolt reinforcement can improve not only the integrity of joint fissure rock mass, but also be a very good control of deformation of jointed slope. It established the foundation on the quantitative for evaluation of joint fissure rock mass deformation and stability.

Abstract: This paper proposes a phase rule for non-extensive systems and asserts that the thermodynamic limit commonly used in extensive statistical mechanics is no longer applicable when considering non-extensive quantities. In addition, this paper revises some of the concepts and conclusions arising in extensive statistical mechanics.

Abstract: In order to accurately analyze the mechanisms of suction piece and deflector rod, and achieve the coordination relations of the sheet separation function between the trajectories; establish the mathematical models of trajectories ( absorbing papers of suction piece, dialing and pressing of deflector rod); and pregame by VB. This method realizes the accurate trajectory design.

Abstract: The flow coefficient of the valve is an important index of measuring the valve circulation ability, a major process parameter of and a significant technical indicator of valves and regulating valves on an industrial basis. Numerical simulation was performed on the flow coefficient of the valve by using FLUENT, software of computational fluid mechanics and by the standard model. The flow and the resistance coeffients were obtained based on the numerical simulation of a new type of throttling /sealing valve under the same pressure differentials but with different opening conditions. The results demonstrate that the flow coefficient of the throttling/sealing valve is in close compliance with the typical curve of equal percent, and thus provides an important basis for its optimized control.

Abstract: In this paper, the effects of angle of attack, camber and camber location on propulsion performance of flapping airfoils undergoing plunging motion were numerically studied at Re=20000 and h=0.175. The unsteady incompressible viscous flow around four different airfoil sections was simulated applying the dynamic mesh. The results show that the time averaged thrust coefficient C_Tmean and propulsive efficiency η of the symmetric airfoil decrease with the increasing angle of attack, and the variation of C_Tmean is more obvious than that of C_Pmean. Both C_Tmean and η for NACA airfoils studied in this paper decrease with the increasing camber and the difference between the propulsion performances of different airfoils is not obvious, and the thrust generation and power of various NACA airfoils gradually increase during the downstroke and decrease during the upstroke. Under the same conditions, the airfoil with a further distance between the maximum camber location and the chord of the leading edge leads to higher propulsive efficiency.