Papers by Keyword: Optimization Design

Abstract: In the process of using the genetic algorithm for grillage structural optimization, direct calculation was applied to grillage structural strength Check. The combination of genetic algorithm and direct calculation can save significant time in optimization design and strength check, at the same time, optimized grillage structure provides more security.And then this structure optimization scheme was programmed by VB with easy interface. The example indicates the program, being reasonable and feasible, proves the combination's superiority.

Abstract: The gating system of an injection mold for car bumper was studied. A design optimization scheme is proposed to optimize both the number and locations of the gates by analyzing the filling process, in order to reduce the part war page and weld line, numerical simulation of injection mold filling process is combined with the design optimization method to find the optimum number of gates and their locations to achieve balanced f low and less weld lines while satisfying the limit of injection pressure. Moldflow software was applied to make analysis and comparison of various gating system in terms of their filling time, injection pressure and clamp force, weld line and distribution of air traps, and an optimized gating system was obtained. The result shows that this method can effectively reduce costs, shorten development cycle and improve the efficiency of molding design.

Abstract: In this study, the engine suspension system was optimized for making the vibration between engine and car body minimized, and also the optimization was simulated using software Adams. The purpose of this study was to research the vibration isolation of the engine mounting system and implement multi-objective optimization for the intrinsic frequency. In this paper, the optimization was implemented in two ways: (1) the intrinsic frequency was optimized by reasonably allocating it: (2) the intrinsic frequency was optimized using energy decoupling. The optimized intrinsic frequencies were simulated using software Adams and then the simulation results were compared. The simulation results showed that the optimized energy distribution was almost up to 90% and the decoupling degree was greatly improved by comparing the initial data, proving the optimized data played a greater effect on engine vibration isolation and further verifying the feasibility of optimization design method.

Abstract: The content of this subject research is to conduct optimization for engine mounting system, and through optimization, it can make the vibration between engine and vehicle body achieve a minimum, using Adams software for simulation. It studies the isolation vibration of the engine mounting system and conducts goal optimization for fixed frequency. This paper uses two methods for optimization. One is to use the rational allocation of fixed frequency to optimize the fixed frequency, and the other is to use energy decoupling method to optimize the fixed frequency. It uses Adams software for simulation of the optimized fixed frequency and conducts comparison of simulated results. The simulated results show that the optimized energy distribution situation almost achieves 90%. Compared with original data, decoupling degree also has a very great improvement, illustrating that the optimized data has greater effect for the isolated vibration of engine, in order to further verify the feasibility of optimization design method.

Abstract: According to the principle of double-half-revolution mechanism, a new kind of quadruped-imitating walking mechanism was designed. In order to simplify the structure of the walking mechanism, each links of the mechanism is driven directly by steering gear.Considering non-interference condition of each links and undulation requirement during movement, the constraint functions were established. In order to ensure the movement feasibility and reduce the undulation of the walking mechanism, optimization design for the size parameters of each links were completed by using Matlab optimization tool. The virtual prototype model of quadruped-imitating walking mechanism was set up in SolidWorks software, and the rationality of the optimization design was verified through the simulation analysis.

Abstract: Swing vane compressor (SVC) is a novel rotary compressor, which is structurally simple with a small size, a light weight and smooth operation. The SVC also has advantages, such as reduced frictional losses and improved mechanical efficiency at high speed. In this paper, a mathematical model including the geometrical, thermodynamic, flow and input power aspects was formulated, which was then linked to an optimization algorithm to search for three main structural design parameters under three sets of design constraints, for an optimum compressor performance with maximum energy efficiency ratio (EER). In the end, the mathematical simulation of the compressor were given and the theoretical optimization study predicted that a large reduction in frictional loss could be possibly achieved, which brings about an improvement in EER of the compressor of about 8.55%.

Abstract: In the past, the safety factor selected was too high, and the material was serious wasted in the design process of lifting equipment. In order to solve this problem, this paper analyzed the stress of the large capacity skip. Through analysis,we had the relationship with the strength of the skip and section cross-sectional area, the thickness of the skip bucket box plate, the stiffener of cross-sectional area, the spacing of stiffeners, and knew the primary and secondary relationship.

Abstract: With the fast development in continuous conveyor technology, the belt conveyor to be more widely applied, the belt conveyor technology is gradually refined, and has made a number of achievements. Drum as a belt conveyor drive components, attracted the attention of the relevant technical staff. To ensure the belt conveyor system, the optimizing design of the drum quality and the strengthen use of the drum performance have an important guiding significance to the safety and reliability as a whole. With the help of ANSYS software, finite element analysis, the optimal design results analysis showed that the effect of optimal design to achieve the purpose of has a certain guiding significance for optimizing the structure of actual production. Key words: Belt conveyor; drum; transmission parts; ANSYS; the optimization design

Abstract: Large sag due to heavy weight of the propeller shaft is a major cause of rotating vibration, so that to use the hollow shaft is an effective way to reduce the weight. Many scholars and engineers ignored that the outer and inner diameter are discrete and integer variables in optimization design of the propeller shaft. The practicability of an optimal solution is affected by decimal value of the diameter. A practical reliability optimization model with discrete and integer variable of the propeller shaft is proposed, and “Solver” in Microsoft Excel is used to seek the solution of optimization design. The reliability optimization model is composed of minimum weight objective function and constraint conditions such as torsional strength reliability, torsional stiffness reliability, critical speed, torsional stability, manufacturing process, etc. Design results show that the reliability optimization model with integer and variable of propeller shaft and the solving method with “Solver” in Microsoft Excel are more reliable and efficient.

Abstract: The optimization design method of geometric parameters of skid shoe which is used to subject weight of marine structures is proposed. Considering skid shoe as steel frame structure, total weight and the bearing capacity of the skid shoe are selected as optimal objectives, and geometric parameters of the skid shoe are taken as design variables. Taking the strength, stiffness, local stability of the skid shoe as the constraint conditions, multi-objectives constraints optimization model of geometric parameters is established, and solved based on complex method. According to research results, a computer program has been developed using VC language. Then geometric optimum parameters of skid shoe in service of CNOOC are analyzed by the program. The results show that optimized design decreases steel volume, steel plate thickness by 28.7%, 18.4%, respectively, compared with original design. The optimization method has a series of advantages, such as simple model, fast calculating speed, high calculation accuracy.