Li Wen Wang

Strength Optimization Design of Box-Shape Arms of a Scissor Lift Mechanism with Single Hydraulic Cylinder

One widely-used scissor lift mechanism with the input mode of single hydraulic cylinder is researched. A unified accurate mechanics model of mechanism arms is constructed. By establishing statics, interior forces and stress formula, the general strength optimization design method of arms is explored. Through analysis of an existed sample, validity of the proposed method is verified in contrast with experiment results. Variation law of mechanical parameters within lifting process is uncovered by modeling analysis of the sample mechanism, which also indicated the necessacity of arms optimization. Finally, a dimension optimization of box arms of proposed mechanism is fulfilled with concept of constant strength to prepare for the coming finite element simulation, experiment research.

Study on the Curve Reconstructing in the Process of Blade Repairing

the aero-blades are often easy to be damaged because of the severe working conditions, and the invading of out objects. Repairing is preferred to replacing with a new one due to the very high expense. The mathematical model of cross section curve is very important to the process of repairing the blade and to the analysis for the working performance of repaired blade. The method of remodeling the curve of cross section is studied including scanning the broken blade, denoising the data points, analyzing the points of cross section and dividing them into four assembles, and fitting them with adaptive mathematical equations. Lastly, the future research plans are given.

3D Model Reconstruction of the Broken Aeroengine Blade Based on the Detection Operator

This paper made the 3D model reconstruction of the V2500 turban blade. First, collected rough points cloud data by using visual measuring equipment. Then, smoothed and filtered the point cloud data, took the rational simplification, finished pre-processing the point cloud data. Finally, the grayscale of space-image algorithm was used for fitting the edge of turban blade, and reconstructed the 3D digital model. The results proved that this method improved smoothness of the model, and reduced time and cost of modeling and machining.

Optimization Design of Towbarless Aircraft Tractor Frame Based on ANSYS Workbench

The 3-D frame model of towbarless aircraft tractor was established with the UG software, and then transferred into ANSYS Workbench to conduct the finite element static analysis to check the bending strength of the frame on maximum load working conditions. Using topology optimization module, original design of frame was optimized in accordance with the calculation result. It shows that the strength of optimized frame meet the design requirements, while the weight of optimized frame is reduced by 8%.

Research on Influence of Parameters Variation on the Fixed Orifice Performance of the Servo-Valve

In this paper, The finite element analysis software is applied to compute the flow field in the fixed orifice with different structural parameter combinations, the pressure distribution curve, the velocity distribution curve, flow rate characteristic, power loss are obtained. By analyzing simulation results, the influence of the orifice parameters on the performance of the orifice is clear. The research is important for the design and optimization of the fixed throttle orifice of the nozzle-flapper valve.

Research on the 3D Modeling of Aviation Gas Turbine Blades Base on Free Surface

In the CAD software, we use the theory of free surface to model the blades of turbine, which makes it faster and effective to achieve surface CAD reconstruction and achieves the inverse modeling of turbine blades. All the works above provide physical model for the study of turbine blades repair technology.

Modeling and Simulation of Aircraft on Ground Deicing Process Based on Thermal Balance

The deicing process and practical model of aircraft on ground were introduced, and the thermal consume was discussed. Deicing model of the aircraft on ground was founded based on thermal balance. The simulation results indicated that the proposed model was effective to analyze the aircraft on ground deicing process.

Design of Airport Snow Removal Operation Optimization and Dispatch System

The airport snow removal operation optimization and dispatch system based on the GPS/GIS/GPRS technology and breadth-first search algorithm is designed in this paper. The airport snow removal vehicle is positioned by GPS system. The information between the vehicle mobile termination and the control center is transmitted by GPRS communication system. The graphic display and safety warning of the airport snow removal vehicle is realized by the GIS technology. The Breadth-first search algorithm is adopted to optimize the scheduling of operation and dispatch the snow removal vehicle. As a result, the efficiency of snow removing work can be improved and the delayed time of the airport opening in snowy day can be decreased.

Simulation and Research of Aircraft Deicing Fluids Deicing Process

The aircraft ground deicing process and practical deicing model of aircraft on ground were introduced, a mathematic model was developed based on thermal and mass balance. In addition, a reference case was chosen to verify the mathematical model and four different spray parameters of deicing fluids were studied. And the simulation results indicated that the proposed model was effective to analyze and research the aircraft on the ground deicing process.

A Simple Frost Model for Calculation of the Frost Thickness over Ground Aircraft Surfaces

In this study, a simple model that describes frost formation over ground aircraft surfaces is presented. The model uses the data of the aircraft surface temperature, air temperature and air velocity to predict the frost thickness. The frost surface temperature and the frost thickness under different atmospheric conditions are investigated. The results indicate the frost thickness increases with the air velocity and the air temperature, decrease with the surface temperature. This model enables forecast of the frost formation over ground aircraft surface.