Optimization Of New Type Research Articles

Performance study and structure optimization of new type of radial flow field proton exchange membrane fuel cell

ABSTRACT On the basis of a circular bipolar plate (BP) of the proton exchange membrane fuel cell (PEMFC), a new rim-type radial flow field (FF) structure was designed inspired by the rim style of the vehicle. In this type of FF structure, the key variables are the number of layers of annular flow FFs, the number of branched FFs, and the amplitude of the waveform of branched FFs. To compare the effects of these variables on FF (especially the FF of cathode), the PEMFC single-cell model with different variables was developed by COMSOL Multiphysics software and then simulated. The reasonable value of these variables in enhancing the PEMFC performance was finally determined by comparing the oxygen distribution, water distribution, pressure drop on the cathode side, and the fuel cell output voltage and power of different schemes. This study achieves the highest ultimate current density and maximum power density among all schemes when the number of branches is 8. A four-layer structure is the most appropriate for selecting the number of FF layers. For the selection of the curvature of the branch, 15° is the most appropriate.

Optimization of new type of gas-liquid countercurrent impinging scrubber nozzle

Optimization of new type of gas-liquid countercurrent impinging scrubber nozzle

Study on Optimization of New Type of Seepage Well Structure in Sponge City

The seepage well is an indispensable part of the construction of the sponge city. It has a good “elasticity” for the city to adapt to the environmental changes and respond to natural disasters. In the face of the current decline in the groundwater level and the water logging in the city, it is urgent to study the new type of seepage well under the complex geological conditions. In this paper, the advantages and disadvantages of the current seepage well structure are analyzed, and combined with the hydro-geological conditions in the area of Feng Xi new city of xi’an, three new types of seepage wells are put forward, such as reinforced concrete filter pool + mufti glass pipe combined structure seepage well, masonry filter pool + single glass pipe combined structure seepage well and prefabricated reinforced concrete structure seepage well. The advantage, disadvantage and applicability of the well are compared, and case analysis is provided, which provides a basis for the construction of seepage wells in sponge cities.

Design optimization of precision casting for residual stress reduction

Abstract Normally all manufacturing and fabrication processes introduce residual stresses in a component. These stresses exist even after all service or external loads have been removed. Residual stresses have been studied elaborately in the past and even in depth research have been done to determine their magnitude and distribution during different manufacturing processes. But very few works have dealt with the study of residual stresses formation during the casting process. Even though these stresses are less in magnitude, they still result in crack formation and subsequent failure in later phases of the component usage. In this work, the residual stresses developed in a shifter during casting process are first determined by finite element analysis using ANSYS® Mechanical APDL, Release 12.0 software. Initially the analysis was done on a simple block to determine the optimum element size and boundary conditions. With these values, the actual shifter component was analyzed. All these simulations are done in an uncoupled thermal and structural environment. The results showed the areas of maximum residual stress. This was followed by the geometrical optimization of the cast part for minimum residual stresses. The resulting shape gave lesser and more evenly distributed residual stresses. Crack compliance method was used to experimentally determine the residual stresses in the modified cast part. The results obtained from the measurements are verified by finite element analysis findings. Highlights This paper focus on analytical, numerical and experimental design optimization of shifter. Performed design optimization by finite element analysis and experimental of live industrial problem. The results can applicable as a basis of design and optimization of new type of the automotive parts. The results of the current work present the actual behavior of induced stresses.

Structural Design and Simulation Optimization of New Type Telescoping Heavy Hydraulic Trailer Steering System

The length variability of telescoping heavy hydraulic trailer wills casue friction and sliding, increasing drag torque and power consumption of steering, moreover, and reducing the security and reliability of steering, so the new type follow-up steering system is designed and studied. In order to reduce the turning radius and tire wear, the adjustable steering wheel structure and double front axle mechanism are designed. On this basis, the theoretical analysis of the steering system is carried out, and the mathematical model is established. The minimum error of actual and ideal angle is regarded as the optimization goal of pure rolling condition, and the simulation optimization and experimental research is done. The results show that: the steering structural optimization is feasible, the performance is optimal on the condition that the actual and ideal angle valves of inside and outside wheels of each axis are approximately equal in turning process, and can reflect the advantage of new follow-up steering system in lowering power consumption, improving product life cycle and other areas.