Papers by Keyword: Optimum Design

Abstract: The flexible flywheel assembly used in the powertrain of an automatic-shifting automobile connects the engine crankshaft and the torque converter and provides a protection to potentially damaging axial movement between the crankshaft and the torque converter. In this research, a fully parameterized model of a flexible flywheel assembly is created, and then optimum design procedures with a zero-order optimization scheme are applied to investigate two cases: the first is to maximize a summation of modal frequencies of the structure; the second is to minimize the maximum equivalent stress in the model. Both optimum design cases have shown improvement in their objective functions, with one of the modes in the first case achieving the greatest improvement of +45.7%.

Abstract: The purpose of this paper is to study the conceptual design and optimization of a compound coaxial helicopter. At the conceptual design phase, the compound coaxial helicopter design work was based on the conventional helicopter and fix-wing aircraft design method. The intersection of these aspects makes the design work more complex, thus, a program for the sizing and performance optimization was developed for the aircraft. The program included the total weight design, aerodynamic analysis, flight dynamics analysis, performance calculation and particle swarm optimization analysis. Under the restricted condition of the flight performance requirements, optimize the design parameters which make the weight efficiency factor decrease. Therefore, the study of optimum design process was warranted.

Abstract: The impacts that steric effect of underground diaphragm wall on mechanical characteristics of building envelopes was considered under the interaction between the support and the wall. With the introduction of correlative coefficients C₁ and C₂, based on the theory of beams on elastic foundation, actual underground diaphragm wall design internal force and the displacement formula is proposed. Through calculate the internal force and displacement under different working conditions, verified the correctness of the formula.

Abstract: Using ProE software establish the digital prototype of wind power maintenance lifting platform and the clamping mechanism, import the clamping mechanism into ANSYS to analysis the static strength. Select the forced major important parts in clamping mechanism,hydraulic cylinder connecting pin board,use the Design Explorer modules in ANSYS Workbench introducing the response curves to do the optimum design, set the thickness of hydraulic cylinder connecting pin board and the work position of the hydraulic cylinder for the input parameters variable,with pin board by stress as output parameter variable, from nine groups of data, selecting the smallest stress group as the new design, analysis and calculate again. Results show that by stress of the optimized clamping mechanism is obviously improved, and the structure of whole clamping mechanism more reasonable and compact.

Abstract: To meet the urgent demand of maintenance and lifting equipment for wind turbine, combined with designation demand, two kinds of primary structure of the maintenance and lifting equipment has been proposed, analyzed and compared. By means of the Solid Works software the initial design on the two kind of the machine, the self-climbing crane and the trailed hoisting platform, have been conducted, the static analysis has been performed based on the mechanics model, and the advantages and disadvantages of these methods have been pointed out and compared in the paper. Compared with the self-climbing crane, the mechanical structure of the trailed hoisting platform is simpler, the control system presented more reliable, simple, easier realized etc, and the cost is lower. The self-climbing crane is high-automatic, but the design of crane high in the free degree and high in difficulty, and the climbing force focused on the wind turbine tower is too large. Conclusion The trailed hoisting platform is determined as the main design method to design the maintenance and lifting equipment for wind turbine.

Abstract: Generally traditional research methods to crowd evacuation depend on experiences and hand calculation, but the errors of these methods are clear. So computer simulation methods have become popular all over the world. The paper studied crowd evacuation behaviors by building EXODUS developed by University of Greenwich. Evacuation time and behaviors were simulated and some differences were compared with the results by hand and experiences, which can give theoretic and methodological guides to crowd management, crowd facilities design, evacuation analysis in buildings, establishment of emergency preplanning and so on.

Abstract: Usually the gearbox casing of twin screw pulping extruder was designed by experience and greater weight. In order to reduce the casing weight under the premise of ensuring its stiffness and strength, firstly the casting lower box and the weakest axle in the casing were analyzed with finite element method by ANSYS software. And then the optimum design was carried out to take the minimum volume as an objective function. Finally, the welding casing has been designed as considering the manufacturing cost. The results show that the weight of the casting lower box after optimization is 22.95% lower than that of the experience design, and the weight of the welding part is 19.09% lower than that. The work has certain significance for optimum design of gearbox casing.

Abstract: BF Multi-point Gear-meshing Flexible drive as research object, Established calculation formula of Wheel pressure on Multi-point Gear-meshing Flexible drive and optimization mathematical model, By using adaptive genetic optimization at drive wheel pressure uniformity optimization of Multi-point Gear-meshing Flexible drive, the result is good, Non-uniformity of wheel pressure drop greatly, Reduce the wear between the Track and the inner orbit of gear, the reliable foundation are provided to improve the structure design for Multi-point Gear-meshing Flexible drive, It has high practical value.

Abstract: In this paper, the optimum design and dynamic analysis of a new type of piezoelectric Braille display cell are studied by computer aided engineering software. At first, the design parameters of piezoelectric actuator are analyzed by finite element method to determine the position of fixed end and minimum voltage to actuate 0.7mm displacement and 15g output force. Then, the optimum design is performed according to the electric displacement 0.7mm, output force 15g, actuator length, position of fixed end and minimum voltage. Finally, Braille display cell is analyzed by dynamic simulation software. It shows that actuators take 0.0002 sec to upward achieve 0.7 mm displacement. The result of optimum design is reasonable in this paper which can be the reference for related research.

Abstract: This paper introduced the definition of modern design method at first. Then the paper analyzed some typical modern design method such as optimization design, green design, man-machine engineering design, innovative design, industrial molding design, concurrent design, reliability design, finite-element method, robust design method and so on. The paper not only analyzed on the characteristics of them but also analyzed their applicability at the same time, at last the paper analyzed the application of those modem design methods in the design and develop process of mechanical product.