Applied Mechanics and Materials Vols. 365-366

Abstract: Fixed stinger system hanging in the stern to implement pipeline S-lay mainly includes an A-frame, a stinger hitch section, a stinger tail section, a knee-brace and a knee-brace hitch. Expect the functional loads the stinger system may suffer environmental loads in construction area and also the inertia loads induced by barge movements. Contrasting to the design of stinger truss, connection mechanism design becomes more complicated for the unknown loads shared during the laying cases or the survival case of the barge. In this paper a set of analytical approach for connection mechanism design are proposed and demonstrated for specific operating conditions. In this approach, structural response analysis were carried out firstly using a beam-element truss model to which pipelay functional loads, environmental loads and inertia loads had been applied and the loads undertook by stinger connections were extracted. Next other connection models constructed by cell grids were enabled to predict the responses of connections under those loads extracted from the analysis results of the first step. The analysis example of this paper confirms that based on this approach more careful strength or fatigue check had been realized for the connections of fixed stinger.

Abstract: In this paper the application of reactive reciprocal method is used to solve the concentrated load rectangular section of the deep beam bending problem. The deep beams new equation of bent rectangular section is not only the use of the power of reciprocal method is used to solve the deep bending beam one of the innovation points, also abounded beam theory. Through numerical calculation, the calculate method of this paper is correct.

Abstract: With the dynamic mechanisms requirements on high performance and long Life, a Life-analysis method based on index of its dynamic performance is worked out. By setting a systematic model of mechanism with its parameters, synthesizing characteristic changes of key components as well as its adjustment ability to control the system, different conditions of the mechanisms Life have been worked out. Related tests proved its efficiency.

Abstract: A correction mechanism prototype is set up on the basis of ADAMS platform. Under the condition that the projectile is in the set flight state, the changing law and affecting factors of general kinetic motion characteristics of the correction mechanism virtual prototype are surveyed through motion analysis of resistance.

Abstract: In this paper, the nonlinear magnetoelastic kinetic equations and the electrodynamics equations of a thin current-carrying plate under the action of a coupled field are given. Using the difference and quasi-linearization methods, the nonlinear magnetoelastic equations are reduced to a sequence of quasilinear differential equations, which can be solved by the discrete-orthogonalization method. The stresses and deformations in a thin current-carrying plate under the interaction of an electromagnetic field and mechanical load are calculated, and the magnetoelastic effect on the plate by the side electric current and magnetic induction intensity is studied. Numerical results show that the states of the strains and stresses in thin plates can be controlled by changing the electromagnetic parameters.

Abstract: In order to study the influence of welding process and local detail design to the life of the metro bogie frame, this paper, in view of the tee joint, researched the superposition of residual stress and external load influence on the structure strength by the finite element simulation to establish mechanical structure and welding process co-design method. Based on the above research, the fatigue strength of the overlapping structure of welding frame socket plate and beam was improved, by the co-design of the groove angle and joint-welding sequence.

Abstract: Model updating methodologies are invariably successful when used on noise-free simulated data, but tend to be unpredictable when presented with real experimental data that are unavoidably corrupted with uncorrelated noise content. In this paper, reanalysis using frequency response functions for correlating and updating dynamic systems is presented. A transformation matrix is obtained from the relationship between the complex and the normal frequency response functions of a structure. The transformation matrix is employed to calculate the modified damping matrix of the system. The modified mass and stiffness matrices are identified from the normal frequency response functions by using the least squares method. A numerical example is employed to illustrate the applicability of the proposed method. The result indicates that the present method is effective.

Abstract: Finite element pre-processing of the railway axle box system is done to analyze heat transfer from the axle to the body. Model geometry which is same with the experimental specimen is designed and cleaned up: connection of adjacent surfaces is repaired; missing surface is created; complex geometry is broken down into simple shapes. Next, the axle box system, which is composed of the axle box, axle box cover, bearing, and axle is meshed with 3D solid element, and then mechanical properties of the materials are added on each components for thermal analysis. The whole model of axle box system has 226,776 nodes and 322,840 elements.

Abstract: Hydraulic spool valve is one of the important elements in the hydraulic system. Considering the material properties of the fluid and solid, CFD models of the viscous temperature rise was built and calculated with the spool material influence on the viscous temperature rise and thermal deformation. Analyzed: the viscosity of the fluid was the main factor affecting on temperature rise, while the coefficient of thermal expansion of the spool was also the main factor to affect the throttling temperature rise of the deformation.

Abstract: The tool feed system main drive shaft of CNC spiral bevel gear milling machine is researched, and the vibration form of the drive shaft is confirmed.The main drive shaft is simplified using the lumped parameter method, the lumped mass model and the force model were been obtained. When bending vibrating, the natural frequency of the main drive shaft is calculated using the transfer matrix method. In order to verify the correctness of the calculations, the vibration of the main drive shaft is simulated by using ANSYS. This paper also designs the vibration control system for the main drive shaft, and analyzes influence factors which affects the vibration of the main drive shaft.