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The effect of different modeling design on temperature field of headlamp was studied. Numerical simulation of internal temperature field of headlamp was performed and temperature distributing rules were summarized. On those bases, a fast analytical model of temperature field of headlamp was presented considering flow field around the automobile. Taking one headlamp modeling design for example, numerical...
The following topics are dealt with: artificial intelligence theory and applications; computer science and applications; network technology; communication technology; system modelling and simulation; automation and control; software engineering; and information system design.
The stability control of the underactuated surface vessel is a new focus of nonlinear control system in the automatic control field. The systems of unmanned surface vessels with two water-jets are typically underatuated systems. In this paper, the three degree of freedom (DOF) planar model of unmanned surface vessels is built at first. The kinematic and dynamic models of underactuated unmanned surface...
The vehicle has a high harmful material emission during cold-start. It has a close relationship with temperature of the fuel. In this paper, a PTC-base injector is presented, which is embedded PTC material around the fuel ducts of common injector and powered by car inverter. The PTC material possesses a low resistance and quickly generates heat when its temperature is lower than Curie point. This...
A force identification technique based on simulation models is proposed and applied to predict the concentrated force at the barycenter of an apparatus. Computation procedure of it is given, in which the model updating and verification steps are included. The mode parameters are used as the base datum for FE model updating. Two verification strategies for the force identification results are introduced,...
In this paper, the starting process of high-voltage permanent magnet synchronous motor (HV-PMSM) was calculated and analyzed by the time-stepping Finite Element Method (FEM) coupling with field and circuits. First, the mathematical model of starting process of HV-PMSM was established. Then the starting performance was analyzed by calculating the equations of transient electromagnetic field and mechanical...
The flow field surrounding an underwater vehicle will change due to the influence from seabed terrains, when it navigates near seabed. The hydrodynamic coefficients of the underwater vehicle will change, and then produce a force and pitch moment, which could pull the underwater vehicle to the seabed. So it's very important for the safety of underwater vehicles while navigating near seabed to predict...
Thunderstorm downbursts are major cause of concern for engineering structures both on ground as well as those in air, namely aircrafts. The wind velocity profile of a thunderstorm downburst-induced wind is significantly different compared to natural atmospheric boundary layer winds. As a type of high intensity winds, thunderstorm microbursts have caused numerous structural failures around the world...
The flow field of the G4-73 centrifugal fan was numerically simulated with the software of Fluent. The numerical results show that large-scale vortex in volute were push forward, and the scale and intensity of vortex change in different circumferential cross section of the volute. A vortex-broken device was designed based on the idea of decrease flow loss and vortex noise through breaking large-scale...
Vehicle loads are the most important live load on bridges. It's significant to study the maximum vehicle load in serving period for bridge design, maintenance and safety-evaluation. Stochastic process, such as Possion process or Erlang process, is a powerful model for understanding vehicle loads. While Possion process or Erlang process is only fit for vehicle load acting on one specific bridge, but...
When an equipment is attacked by ammunition, ball cartridge experiment of estimating the broken parts in the equipment costs too much, takes long period and is danger to people; comparatively, the simulation method is economical, efficient and safe, which could also forecast the damaged components. In this paper, adopting finite element method, a research has been made on numerical simulation of shaped...
Lattice transmission towers are widely used in overhead transmission lines. Accurate prediction of the load bearing capacity of lattice towers under different failure modes is very important for the accurate assessment of the reliability of transmission lines. Traditionally, lattice towers are analyzed as ideal trusses or frame-truss systems without explicitly considering loading eccentricity and...
This paper presents an optimal NC interpolation method for circular arc by using the intersection polygon to approach the circular arc. The recursion formula of interpolation coordinate under the cyclical interpolation way is given and the algorithm has been advantageous realizes. The result of interpolation process's experiment indicates that the new interpolation method has improved the insufficiency...
Based on the geological parameters of LIAOHE oil field, a numerical model with interlayer was established by computer, the STARS block of CMG was employed to simulate steam assisted gravity drainage (SAGD) with vertical and horizontal wells, the influences of interlayer on SAGD, the expansion process of steam chamber (SC) and the production index was obtained and analyzed. The results indicate: whether...
This paper study OSEM image reconstruction algorithm on different subset of a series of numerical simulated data, through the mean square error of image reconstruction on different subset in the same generation of iteration, analysis effect of reconstructive image and convergence rate. Ordered subsets EM (OS-EM) provides a restoration imposing a natural positivity condition and with close links to...
In this paper, the basic feature of particle system of coal stream is analyzed, the property model of coal stream particle is established by discrete element method according to its characteristics and a moving model is constructed by a simplified Hertz-Mindlin contact, and the coal stream movement is simulated with particle system, which plays an important role in assuring the fidelity and integrality...
In the present study, a series of terminal ballistics numerical analysis and experiments were performed to investigate the process for explosion load drive the based-water extinguisher dispersed. In the Numerical simulation, for the representative fire extinguishing warhead, the simulation model was built, The variety rule between the loading coefficient (drive charge divide liquid mass) and the breach...
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