In many practical problems, it is sometimes necessary to evaluate the derivative of function whose values are given approximately. Firstly, the problem of estimating the derivative of a function observed with error is studied. It presents a proper regularization strategy and explain how to choose regularization...

A three-dimensional elastic-plastic FE(finite element) model of power spinning of thin-walled Ti2AlNb alloy shell was established based on the dynamic, explicit module of FE software. The key technologies, including contact boundary, mesh, were dealt with reasonably. The reliability of model was validated...

The stretching process is a complex plastic deformation process, the deformation zone is relatively large, metal flow, in the process of drawing prone to flange wrinkling and force transferring area of tensile deformation to scrap parts. Therefore, it is necessary to analyze the wrinkle, the root cause...

As different friction coefficients, extrusion speeds and extrusion temperatures have an effect on equal channel angular extrusion process of Ti5553 alloy under non-isothermal condition, 3D model had been set up to simulate the high temperature deformation behavior and particle tracking method was given...

The Deep penetration perforation water-jet technology is an effective method of the potential remaining oil exploration. Before the deep penetration perforation of reservoir it needs to open a window on the casing pipe. But the windows easily lead to decrease of casing pipe strength, which cause casing...

The energy minimization multi-scale model was applied to the plane jet. The stability condition of plane jet was adopted to predict the velocity distribution of plane jet. .The ratio of total dissipation to viscous dissipation tends to the maximum was used as the optimization condition. The simulation...

The general modeling method of composite quick-install scaffold used in substation construction is proposed for the scaffold inspection and evaluation in the delivery test. The method analyzes the characteristics of the scaffold structure and can be suitable for different types of composite quick-install...

The cumulative exergy method is used to analyze and optimize a heat pump distillation process with respect to the total environmental impact including resource use and emissions. The results from the proposed method are compared with the ones from thermoeconomics. It is found that such an extended exergy...

order to study the temperature field, stress field, strain field, thinning rate and phase distribution in the hot forming process of torsion beam, the thermal mechanical coupling numerical simulation method based on LS-DYNA is adopted in this paper. Study found: Due to the different regions of part contact...

With the help of topology optimization and coupling analysis, the virtual prototyping technology was first used in designing a GFRP engine mount frame. In this design, the topology optimization technology based on a variable density method was introduced in order to reduce the structural weight while...

The mixture model based on the Euler-Euler approach along with the standard k- turbulent model was employed to predict the two-phase flow and heat transfer in the external cyclic purification hot-dip galvanizing bath. The arrangement of the return and pump pipes was assessed to determine its effect on...

To gain a deeper understanding of damage evolution in carbon fiber-reinforced plastic (CFRP) composite materials, This paper addresses an application of recently developed Hilbert–Huang transform (HHT) signal processing technique on acoustic emission (AE) signals feature extraction of damage Mechanism...

In order to study the response behavior of engine rubber bushing under high speed impact, improve the simulation accuracy of the whole vehicle, the mechanical properties of rubber bushing was studied. The method of the drop-hammer impact on the rubber bushing was analyzed. A station was built with the...

In this paper, the CALPHAD Helmholtz energy approach, based on the Debye-Grüneisen model, has been used to calculate the thermodynamic and thermophysical properties of fcc Ag (Silver). Through this approach, thermodynamic properties, e.g. heat capacity and Gibbs energy, and thermophysical properties,...

The surface trajectory of lapping disc in lapping process was simulated in this paper. The simulation was based on the analysis of lapping disc wear trajectory by using the computer simulation technology. The law of disc wear trajectory and the influence of processing parameters were studied. The computer...

In this research, a Navier-Stokes equations based Newtonian fluid model was employed to conduct mathematical modeling on the polymer fluids with low shear rate under pressure-drag flow. Then, a weight function for the equations of the continuity and motion of the fluids is obtained by using an interpolation...

Data fusion of traffic parameters such as speed and density is a crucial study in intelligent transportation system, yet complicated to formulate mathematically. The aim of this paper is to study and model the multi-source fusion traffic flow data. Based on the data detected in a mega-city, the regression...