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BIW modal optimization with traditional FEM method was inefficiency and usually with much mass increase. FEM analysis combined with Multi-objective Optimization method was used to improve the first order frequency of BIW. Mathematic model was built by response surface method to replace FEM model and NSGA-II was used to get non-dominated solutions. During the optimization plates with high relative...
With the crank-slider mechanism, applied the principle of Cutting the screw thread(CST) to the low rear protective device of truck, devised a new type of device which supplied a new solution for the crash incompatibility. Firstly, according to the dimension of certain type of Foton light-duty truck and the requirement of regulation, took the maximum transmission angle as optimized object, with the...
The submersible mixer as major sewage treatment equipment is very important to sewage treatment plant. The numerical simulation of the internal 3-D incompressible turbulent flow agitated flow field was carried out. By changing some design parameters of mixer impeller, we can analyze the numerical simulation results, they showed that: the impeller produced vortex jet flow, the constant velocity lines...
An optimization technique for design of squeeze casting parameters of AZ91D magnesium alloy based on the Anycasting software was proposed in this paper. The various process parameters for a casting model of magnesium alloy were designed. Mold filling and solidification processes of the magnesium casting were simulated with the Anycasting. The simulation results indicated that process parameters significantly...
This paper introduces the optimal design of detachable grip spring. The optimization mathematic model of cylinder helical spring is proposed according to the design method of the spring. The model is solved by using MATLAB optimization tool. And it provides the optimal program. The result of operation indicates this method is feasibility. Optimal design method and the using of MATLAB software are...
A single-crank-double-rocker mechanism is used to realize the flapping motion of Micro flapping aerial vehicle. However, this vehicle often pitches toward left or right and crashes during flight which mainly caused by the incomplete symmetry of wings movement. To solve this problem, mathematical models of the flapping angle and angular velocity of two wings are established, respectively. An optimal...
According to requirements for grading and characteristics, mathematical model of linear vibrating screen with the pursuit of minimum power consumption per productive is established. By means of MATLAB optimization technology, the best design is acquired. The results show that power consumption per productive obtained from optimization is decreased significantly compared with empirical design.
To study the best mixing locations of the gas and the air in such a narrow space within the width of the rotary furnace, this dissertation designs four programs to simulate the regenerative combustion process. By analyzing the simulation results of those four programs, it is found that the furnace reaches the best efficiency if the mixing point locates at 40% to 50% of the furnace-wide. Experimental...
The fuzzy analytic hierarchy process (FAHP), which decomposes the complicated objects into simple hierarchical decision-making processes, with the fuzzy pairwise judgment matrix is constructed by the fuzzy logic relation of the factors in each layer. The total fuzzy weights are obtained based on the weight of each layer, which provide the quantitative analysis basis for the decision-making. The volume...
System analysis of coupled multidisciplinary systems is a key technique of MDO (Multidisciplinary Design Optimization). This work is often computationally expensive since it requires a number of discipline analyses which themselves are also costly. To abate the computation efforts,this paper present a method which evaluate the system level responses by using the discipline level Kriging models.In...
By analyzing the deficiency of the previous structural design of the guyed anchor. The essay studies the design optimiization of the guyed foundation of the transmission line repair tower. It designes the most safe, economical and rational foundation type through building mathematical optimization model using of existing design theory of tower, applying the matlab optimization toolbox, preparing to...
An improvement of virtual work criteria for structure optimization is presented to overcome the shortcomings caused by the neglect of dead weight and inertial load of structure in solution of criteria equations. Deduction of criteria equations is analyzed to prove that the shortcomings lead to the error of structure optimization. Therefore, new criteria equations are formulated using the displacement...
This paper presents an optimal design for gears considering gear transmission error, size and lubrication parameters and using Grey Relational Analysis Technique. For this purpose, a new approach has been utilized in order to calculate the transmission error in involute spur gears to get outputs in the shortest time with a high accuracy. In this model, a statically un-determined problem is considered...
For the life cycle of products, the global unified multidisciplinary model is the core of the simulation optimization. It can effectively organize relative information, manufacturing resources and processes within the life cycle of products. The information has some differences in the content, format and pattern. So a consistent approach to describe the data and data relationships is needed. Using...
An optimization method for a truss structure design using the Ant Colony Algorithm is presented in this paper. With the constraints of the truss stiffness, strength, allowing displacement and other design conditions, the Ant Colony Algorithm is implanted to the optimizing process of the truss structure using the program languages of MATLAB. Two typical trusses are used as examples to demonstrate the...
Sample database was established and the mapping relationship between span,rise-span ratios and type of shell with minimum weight was simulated by using BP neural network method. The selected typical samples were chosen from hundreds of sectional optimized results based on sequential two-level algorithm from five typical types of reticulated domes. This paper provides a simple lectotype optimization...
The leaf spring is the flexible component of dependent suspension, which has advantages of simple structure, convenient maintenance, low cost, and can be used to locate the axle. The traditional multi-leaf spring has various defects. The few-leaf-spring has been one of main development trend of leaf springs because of its excellent characteristics. In this paper, a few-leaf-spring with variable thickness...
Real-world design optimization problems are typically computationally-expensive and to address this various model-assisted evolutionary frameworks have been proposed. However, often such problems are also high-dimensional and in such settings models tend to have poor accuracy and thus degrade the optimization search. To address this we propose two complementary dimensionality-reduction frameworks...
The FEA model was built and modal analysis was executed for the loader hood structure. The mathematical model of topology optimization on continuum structures was established based on the solid isotropic material with penalization (SIMP) theory. A new layout of the ribs of loader hood was gotten through topology optimization using OptiStruct software. The results show that the improved design of the...
Harmful substances emitting from aluminum electrolysis process may pollute the environment. Ventilation is the effective means to control the hazards. In order to obtain the best ventilation effect for 300kA aluminum electrolysis plant, CFD method is used to simulate and optimize the workshop ventilation. Based on theoretical analysis and preliminary calculation, a 3D model is built, five kinds of...
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