Applied Mechanics and Materials Vols. 215-216

Abstract: It introduces the load from the converter when the Angle in 0 degrees, and describes the method of using the Pro/E software to model and importing to ANSYS software, then, based on the finite element theory, using ANSYS software to analyse the mechanical stress of the converte to obtain the maximum stress and the parts of the stress concentration, the analysis results of converter is for designing to provide the theory basis.

Abstract: A new structure is proposed to solve the failure mode of PDC cutter created by its mechanical fatigue, crack and diamond table delamination, so as to improve their service life. By applying the finite element method analysis, the force allocation of PDC cutter and multi-face (as known non-planar) designed PDC reinforced-cutter revealed that: the distribution and size of the internal stress in the cutter when working was improved, and the multi-face structure further reinforced the meshing force of the cutter’s PDC layer and cemented carbide substrate. And thus significantly strengthen the shear-resistance capability. This is particularly meaningful to the kinematics of mono-cone bit and its adaptive exploration of rock-breaking features, as well as to the related scientific disciplines in the future.

Abstract: Ring die is the critical component of pellet mill, its working performance and service life directly affect the pellet quality and production cost. This work analyzed the stress distribution of ring dies with two different hole arrangements and studied the influence of stress distribution on ring die strength. It is shown that there is stress concentration at the hole edge and the stress concentration distributes along the width of ring die at the feed side, the die hole arrangement have influence on ring die strength and the effect of hole wall thickness on ring die strength increased with the wear of die hole, finally a better pattern of hole arrangement was obtained.

Abstract: Based on asymmetric loss function, the estimations and their properties of liquid rocket engine are discussed. The UMVUE and bayes estimator for some lifetime parameters, reliability and hazard function are obtained under entropy loss function. And we prove the estimations with the form of cT+d are admissible. At last, the statistical performances are compared through the MSE based on Monte Carlo simulation study. According to these comparisons, it is suggested that the empirical bayes estimators have high-precision.

Abstract: Finite element analysis is undertaken to identify the extent of loading deformation of instrumented indentation equipment frame which is a main part in High-precision instrumented indentation tester developed and realized by our group. The working load enacted in the model is varied from 10N to 100N, and the increment load is 10N. By plotting and fitting data of inclination angle and working load, the relationship between frame inclination angle and working load is established. The function of this relationship is θ=0.000024*F. When the working load is up to the upper bound 100N, the inclination angle of frame reaches the maximum value 0.00241°.Load analysis of push rod shows that the percent error between measured load values and real indentation load values caused by maximum inclination angle is in 10-8order. The conclusion is thus derived that frame inclination has nearly no effects on load measurement precision. The research in this paper confirms that the design of frame belonging to High-precision instrumented indentation tester is appropriate.

Abstract: By way of Matlab software simulation, the relationship among shear stress and frequency, velocity, displacement and ER properties has been researched, the damper strength -- velocity, damper strength – drift properties of shear electrorheological fluid damper has been given, the law of damper strength with frequency, gap , diameter and electric field strength has been showed that damper strength is increasing with electric field strength, the biggest damper strength is 100kN, the key facters are velocity, drift, frequency, gap and etc.

Abstract: As a number of parameters significantly influence the concrete mixtures quality, the concrete fluidity impacts much on the production process and product quality. To improve the concrete mixtures quality, the concept of frequency-converting rotation is proposed based on the rotation driving dynamic characteristics of mixer. By analysing the phase-frequency characteristic of twin-shaft mixer's working system, the dynamic behavior of mixing concrete is defined. When the agitating shaft is frequency-converting drive, the "boiling" movement occurs in concrete, which characteristics are better than that constant speed drive makes and improves the microscopic homogeneity of concrete.

Abstract: The joint clearance on mechanism dynamic characteristics influence can not be ignored. This paper established a geometrical model of planar four-bar mechanism, it built the model of contact force and friction and embedded into the software of ADAMS dynamics analysis mechanical system, which analysis the dynamics simulation of mechanism. We obtain a accurate prediction of dynamic characteristics of mechanism with joint clearance effect from the analysis. What's more the results provide reference and basis for later mechanism design [1,2,3].

Abstract: Dynamic modeling of beveloid gears is less developed than that of spur gears, helical gears and hypoid gears because of their complicated meshing mechanism and 3-dimsional dynamic coupling. In this study, a nonlinear systematic coupled vibration model is created considering the time-varying mesh stiffness, time-varying transmission error, time-varying rotational radius and time-varying friction coefficient. Numerical integration applying the explicite Runge-Kutta formula and the implicit direct integration is used to solve the nonlinear dynamic model. Also, the dynamic characteristics of the marine gear system are investigated.

Abstract: For being convenient for researching the dynamic characteristic and the improvement and use of the planar six bar mechanism, for improving the dynamic technical performance, the three-dimensional solid model of the mechanism was established with ADAMS. Each part of the model in ADAMS was set up. Simulation analysis on the working process of the mechanism was achieved. The structure optimization parameters of the mechanism were obtained. The result proves that the vertical location of revolute joint of link and rocker, the location of revolute joint of crank and frame, the horizontal locations of two revolute joints of link are almost no impact on the vertical speed of slider. The vertical locations of revolute joint of frame and rocker and revolute joint of block and slider have less impact on the vertical speed and acceleration of slider. The vertical location of revolute joint of link and crank, the horizontal locations of revolute joint of frame and rocker and revolute joint of block and slider have greater impact on the maximum vertical speed and acceleration of slider.