Applied Mechanics and Materials Vols. 423-426

Abstract: In order to solve the problems that the current components using for recycling the film in the Plastic film recycling machine are not suitable for a large quantity of coating stubble corn plastic film recycling. Based on the work principle of “shovel-excavation screening”, developing the whole design:shovel film stubble→topsoil delivery→soil sieve→set the heap surface.By optimizing the design and combination of various components to achieve plastic film recycling of corn stubble. This machine can meet the requirements of recycling the film, raising the stubble and grounds care in the alpine arid regions. It can solve the difficult problems about the uneasy recovery of the serious damage film and the film recycling of the stubble crops like corn.The experiment showed:①The plastic film recycling on topsoil can use the way of shoveling, in the first step all the film was picked up from the topsoil.②At the same time it can be able to recycle the film containing 22.5% corn stubble.③ The plastic film recovery on the topsoil can reach or over 90%.

Abstract: The Computational Fluid (CFD) technology has been successfully used in the numerical simulation of the turbulent flow of centrifugal pump.In this article , we carry on the experiment by using uses ANSYS software,based on the standard k-ε model, SST model and BSL model , to get the the flow field of the numerical simulationof the impeller .We found that the simulation results and the actual results are different under different turbulence models. Then we can draw out the Q-η curve and compare it with the actual test data.Compared with other turbulence models, The SST model is more suitable for the models of centrifugal pumps in the article.Furthermore,we list the pressure contours and velocity vectors for pumps discussed in the paper under the optimal model.The process can provide a theoretical reference for the optimization and further study of the centrifugal pump in the future.

Abstract: First, the basic principle of the DSMC method is introduced, which include simulating process, calculating of collision and key technique about simulation. Then a detailed process of simulation analysis to Disk-type Molecular Pumps extraction process based on DSMC method, is described, such as establishing geometric model, meshing, selection of collision model, boundary simulation, etc. At last, the ongoing work is pointed out .

Abstract: This paper presents a Modified model reference adaptive system (MMRAS) speed controller for speed estimation of induction motor using model-reference adaptive scheme (MRAS) approach in a direct torque control system. A good speed controller of induction motor can enhance the speed estimation of sensorless drives. The MMRAS controller can reduce effect of parameter variations and nonlinearities in the induction motor, and approaches to desired performance of referenced model. So, the presented controller can enhance the performance of speed estimation. The availability of the proposed structure scheme is verified by through under computation simulations with MATLAB software. Simulation results are presented in order to prove the availability of the proposed structure scheme.

Abstract: A wind tunnel test is designed to study aerodynamic effects of one individual rocket with deflectable nose. The test measures pressure with U-bend tube which is cost effective. Using rubber tubes in different lengths to measure pressure distributions of a flat-plate, and calculating how rubber tube affects the measurement, in order to modify the measured surface pressure of the nose. The surface pressure varies on different points while yawing angle and attack angle changes, the changing regularity could provide data for following numerical simulation and trajectory control.

Abstract: A trunk lid plate was taken as an example and Fiberglass-reinforced PET material was used to replace steel for weight-saving in this paper. According to the thin plate stiffness theory, thickness of suitcase cover plate is 3 mm approximately, using finite element simulation analysis to verify its stiffness and mode meet requirements exactly. Injection molding was chosen as plates forming method. Plastic parts warpage had closely relationship with various process parameters, orthogonal experiment was used to find the optimal parameter in the given range.

Abstract: We demonstrate a Yb:YAG thin disk laser with multi-pass diode-pumped structure and direct water cooling device. In the pump system, four passes of the pump radiation are focused on the thin disk using a center-punched spherical lens. The thin disk serves as the window of a copper tank and is directly cooled with recycle water-contacted method. The thin disk laser has a low pump at the threshold of operation. We obtained 450 mW output power around 1030 nm in a simple F-P resonant cavity.

Abstract: Apply the CFD numerical simulation the internal flow field and noise when the control valve is bonnet leakage and trouble-free. Research shows that bonnet leaking has almost no effect on valve inlet and outlet flow field. It is an impact on valve body flow field and the greatest impact on balance cavity. It changes the flow direction of the balance cavity and produces right vortex, in balance cavity where originally without noise, the tremendous noise appeares and improves the noise of the surrounding area.

Abstract: To realize miniaturization design for special fuel filling equipment, based on analyzing workflow of special fuel filling equipment, an optimal scheme of the fluid road system is put forward aiming at requirement of the fluid road system. By multi-function pump, bothway metering device and the three-way electric valve,fluid road flow is built, which could realize forward and backward working and bothway output. Under the premise of ensurfing the technical technical support task, fluid road flow is optimized and service efficiency is improved, which lays a technical foundation for realizing miniaturization design of the filling equipment.

Abstract: In order to achieve high efficiency of new fuel engine, a mathematical model based on mass, momentum and energy equations was developed to describe the motion and evaporation characteristics of a single ethanol droplet in high temperature nitrogen environment. By comparing the numerical results with experimental data, the validity of model was confirmed. The relationships of droplet temperature, velocity, size with time and movement distance under different ambient pressures were analyzed. The calculated results indicate that with a higher ambient pressure, the droplet temperature is higher, the droplet velocity declines faster, the movement distance is shorter; the evaporation rate is slower, and the droplet life is longer. Within the distance where the droplet velocity continuous variation, the droplet temperature rises gradually, the droplet size expands slightly, and with the increase of ambient pressure, the droplet expansion is more significant.