Papers by Keyword: Design Study

Abstract: In this work, a method for optimizing the main clamping components for a vibration system on the working body of a plow is presented in order to reduce the forward forces. To achieve this goal, a variable geometric model is established, which considers the unique operational parameters, and a three-dimensional finite element model is generated for conducting an optimization investigation. The 3D finite element analysis is automatically refreshed for each version of the geometric model. An optimization analysis is characterized by its defined goals or objective functions, alongside design variables and constraints. To illustrate, one can adjust the dimensions of a component to minimize material usage, all the while ensuring that stresses remain below a predefined threshold. In this scenario, the volume being minimized serves as the objective function, the dimensions under adjustment represent the design variables, and the stress limitation acts as the behavior constraint. The main objective is to optimize fasteners using finite element analysis to reduce production cost with maximum efficiency.

Abstract: This work presents a design study of customized p⁺ arrays having influence on the electrical properties of manufactured 4H-SiC Junction Barrier Schottky (JBS) diodes with designated electrical characteristics of 5 A forward and 650 V blocking capabilities. The effect of the Schottky area consuming p⁺ grid on the forward voltage drop, the leakage current and therefore the breakdown voltage was investigated. A recessed p⁺ implantation, realized through trench etching before implanting the bottom of the trenches, results in a more effective shielding of the electrical field at the Schottky interface and therefore reduces the leakage current. Customizing the p⁺ grid array in combination with the trench structure, various JBS diode variants with active areas of 1.69 mm² were fabricated whereas forward voltage drops of 1.58 V @ 5 A with blocking capabilities up to 1 kV were achieved.

Abstract: To prolong the life of cartridge retaining pawl and link stopper in a gun cartridge retaining Mechanism, three compression springs stiffness are reduced via design study and optimization design based on dynamic analysis. Presenting the load of shell on a typical stage while entering-bore, differential equations of motion in this mechanism are established. With translational velocity of shell as the design variable, a design research and simulation analysis are made. And the relationship between shell velocity and proper shell-feed is acquired. An evaluation function is built using springs stiffness with preference-selection. With this evaluation function as the optimum objective, spring stiffness as design variables, and proper shell-feed as constraint condition, the minimum of three spring stiffness is obtained after calculation. The results indicate that compared with the original design parameters optimization results, are significantly improved with the stiffness decreased separately by 20.27%, 11.99% and 6.86%.

Abstract: As a starting point to the environmental adaptability theory, this paper elaborates the concept of adaptation and promotes the open, long-effective and combinable design method. Based on this, the experimental disaster environmental adaptable device has been invented. Also, by regarding the theory of building adjustment as a theoretical framework, the present study seeks to discover the applicability of environmentally adaptive model which can meet the need after the emergency or disasters, playing an essential part to the self-regeneration, and in addition to find other adaptative models which can run under changing environments.

Abstract: It is the starting point and destination of the planning of the new rural construction to design the new rural landscape, protect th e village environment, historical and cultural heritage, maintain the system of grass- roots belief and establish a dynamic and harmonious society. The old village should not be completely razed, and also it should not be completely changed by the city. Through the patterns of the village landscape, the ecology, history, culture of the rural landscape and the process of social life can go with continuity and regeneration.

Abstract: By using GTM method, with equal volume parameters as the criterion, determined the suitable temperature of Evotherm warm-mix rubber-modified asphalt mixture, and applied Marshall method for repeated experiments, holding that GTM method could increase the cooling rate. Then, it firstly proposed a two-stage design method to conduct design of warm-mix rubber-modified asphalt mixture based on the two-parameter system; on the basis of hot-mix asphalt mixture test, it carried out staged design of asphalt content and temperature to ensure the pavement performance in terms of material composition and volume parameters. Finally, the paper conducted performance test of the designed warm-mix mixture and made comparative analysis of the corresponding hot-mix mixture. The results showed that the low and high temperature performances as well as the water damage resistant performance of Evotherm warm-mix rubber-modified asphalt mixture were superior than that of hot-mix mixture, and its compression resilience modulus was roughly equal to that of the hot-mix mixture, which would not affect the pavement structure design.

Abstract: The cost of development for physical prototypes of parallel robots is high and the optimization cycle is long. The optimum method of high efficiency is explored. A virtual prototype model of 3RPS is established to analyze how the rotational angle of the robot is affected when the parameters of the robot vary. The results show that it is a good method and easy to be used in practice. The optimum parameters are obtainned for the workspace indicating that rotational angle is the best one.

Abstract: A design study for ceramic pistons was undertaken in order to address the overheating problems associated with the caliper during aggressive braking using modern C/C-SiC brake discs. The reasoning behind the piston design and the choice of the shaping technology are explained. Zirconia-toughened mullite (ZTM) ceramic was chosen for the pistons, because this material exhibits a low thermal conductivity, sufficiently high mechanical strength and fracture toughness, as well as very good thermal-shock resistance. The manufacturing technology of experimental ceramic brake pistons involved compounding of the selected starting powders to form a high-solids-loadingcontaining feedstock, tooling, shaping of green parts by low-pressure injection molding, extraction of the organic binder, pressure-less sintering in air and final machining. Prototypes brake pistons were fabricated and successfully tested as components of motorcycle brake systems in a test laboratory and on a motorcycle racing track.