scholarly journals Optimization Design of a Double-Channel Pump by Means of Orthogonal Test, CFD, and Experimental Analysis

2014 ◽  
Vol 6 ◽  
pp. 545216 ◽  
Author(s):  
Binjuan Zhao ◽  
Douhua Hou ◽  
Huilong Chen ◽  
Yu Wang ◽  
Jing Qiu
Keyword(s):  
Experimental Analysis ◽  
Optimization Design ◽  
Stokes Equations ◽  
Design Method ◽  
Reference Value ◽  
Orthogonal Test ◽  
Optimized Design ◽  
Range Analysis ◽  
Design Scheme ◽  
Double Channel

A new approach to optimizing a double-channel pump was presented, based on combined use of orthogonal test, computational fluid dynamics (CFD), and experimental analysis. First, a preliminary pump was designed according to design specifications, implementing the traditional design method. Later, a standard L9 (34) orthogonal table including 9 representative design schemes was implemented to find the best parameter combination for the impeller of the pump. Reynolds averaged Navier-Stokes equations accompanied by Smith modified k-ε turbulence model were solved to obtain the inner flow fields of the pump as well as its hydraulic performance for each design scheme. The optimized design scheme was obtained after range analysis. Finally, CFD analyses and experiments were carried out to evaluate the optimized design. The results show that the characteristics of the optimized pump were obviously improved, and the simulated pump head and efficiency increased by 3.622% and 9.379%, respectively. This research not only provides an effective way to improve the hydraulic design of double-channel pumps, but also has certain reference value in multiobjectiveoptimization design of other pumps.

Optimization Research on Dynamic Balance of Spatial Engine under Limiting Shaking Moment

2009 ◽  
Vol 626-627 ◽  
pp. 693-698
Author(s):  
Yong Yong Zhu ◽  
S.Y. Gao
Keyword(s):  
Mathematical Model ◽  
Objective Function ◽  
Kinetic Analysis ◽  
Optimization Design ◽  
Design Method ◽  
Dynamic Balance ◽  
Optimized Design ◽  
Design Variables ◽  
The Mathematical Model ◽  
Shaking Moment

Dynamic balance of the spatial engine is researched. By considering the special wobble-plate engine as the model of spatial RRSSC linkages, design variables on the engine structure are confirmed based on the configuration characters and kinetic analysis of wobble-plate engine. In order to control the vibration of the engine frame and to decrease noise caused by the spatial engine, objective function is choosed as the dimensionless combinations of the various shaking forces and moments, the restriction condition of which presents limiting the percent of shaking moment. Then the optimization design is investigated by the mathematical model for dynamic balance. By use of the optimization design method to a type of wobble-plate engine, the optimization process as an example is demonstrated, it shows that the optimized design method benefits to control vibration and noise on the engines and improve the performance practically and theoretically.

scholarly journals Structure Optimization of UHV RIP Oil-SF6 bushings Based on Improved Equal Margin Design Method and Back-Propagation Neural Network

2021 ◽  
Vol 261 ◽  
pp. 03040
Author(s):  
Zhang Shiling
Keyword(s):  
Field Distribution ◽  
Optimization Design ◽  
Design Method ◽  
Back Propagation ◽  
Back Propagation Neural Network ◽  
Analytic Formula ◽  
Optimized Design ◽  
Thermal Coupling ◽  
Coupling Calculation ◽  
Temperature Factors

Equal margin design method based on the classic analytic formula is widely used in development of extra-high voltage bushing products, and its effectiveness and practicality have been fully validated. However, model and temperature factors have significant impact on internal E-field distribution of UHVAC and UHVDC bushing condenser, which traditional analytic formula is difficult to evaluate quantitatively, so it’s necessary to improve traditional equal margin design method. Firstly, basic principles of equal margin design method and its software package were briefly described, and the laws of model and temperature factors influencing on condenser E-field were investigated on FEM (finite element method) computing platform. Based on these, mathematical model of improved equal margin design method for bushing condenser was established, and flow chart of optimization process combining FEM electro-thermal coupling calculation with genetic algorithm was presented. The improved method was applied to design of UHV RIP oil-gas prototype to realize uniform axial E-field distribution along bushing condenser and equal partial discharge margin between adjacent foils. Bushing condenser was fabricated according to above optimized design structure, and has passed all type tests. In the paper, the FEM electro-thermal coupling calculation method was applied to the inner insulation optimization design to make bushing condenser’s design more suitable. The paper can provide some theoretical guidelines for research and development of other bushings in UHV level.

An Optimization Design Method of Geometric Parameters of Skid Shoe Referring to Subject Weight of Marine Structures

2014 ◽  
Vol 678 ◽  
pp. 325-332
Author(s):  
Feng Yan Yang ◽  
Xiang Zhen Yan ◽  
Zheng Rong Song ◽  
Ming Wang Yang ◽  
Zi Kun Zhao ◽  
...  
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Plate Thickness ◽  
Optimization Method ◽  
Geometric Parameters ◽  
Frame Structure ◽  
Complex Method ◽  
Optimized Design ◽  
Original Design ◽  
Marine Structures

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.

An Experiential Optimization Design Method for Orthogonal Rib-Stiffened Thin Walled Cylindrical Shells under Axial Loading

2011 ◽  
Vol 110-116 ◽  
pp. 1773-1783
Author(s):  
Jia Mao ◽  
Yu Feng Chen ◽  
Wei Hua Zhang
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Mass Parameter ◽  
Cylindrical Shells ◽  
Reference Value ◽  
Buckling Load ◽  
Element Analysis ◽  
Buckling Loads ◽  
Load Optimization ◽  
Thin Walled

Parametric structural FEA (Finite Element Analysis) models of the orthogonal rib-stiffened thin walled cylindrical shells are established using APDL (ANSYS Parametric Design Language). An experiential optimization design method is then developed based on conclusions of series numerical analysis investigating the effects of parameters’ modification upon buckling loads and modes of the structure. The effects of single design parameter modification under both variational and fixed volume (mass) constraints upon the buckling loads and modes indicate that, only one design scheme is able to obtain maximum buckling load when deployment of the strengthening ribs and volume (mass) parameter were settled previously, and minimum mass would be obtained while this maximum buckling load equals to the required design load. Optimization calculations for aluminum alloy material and layered C/E (Carbon/Epoxy) composite material shells with three layering styles are implemented and discussed, and some useful conclusions are obtained. Method and approach developed in this paper provide certain reference value for the optimal design of such structures.

scholarly journals Multi-objective aerodynamic optimization of flying-wing configuration based on adjoint method

2021 ◽  
Vol 39 (4) ◽  
pp. 753-760
Author(s):  
Xiaodong Liu ◽  
Peiliang Zhang ◽  
Guanghong He ◽  
Yongen Wang ◽  
Xudong Yang
Keyword(s):  
Optimization Design ◽  
Adjoint Method ◽  
Stokes Equations ◽  
Design Method ◽  
Adjoint Equation ◽  
Geometric Constraints ◽  
Navier Stokes ◽  
Aerodynamic Design ◽  
Aerodynamic Optimization ◽  
Multi Objective

In order to solve the multi-objective multi-constraint design in aerodynamic design of flying wing, the aerodynamic optimization design based on the adjoint method is studied. In terms of the principle of the adjoint equation, the boundary conditions and the gradient equations are derived. The Navier-Stokes equations and adjoint aerodynamic optimization design method are adopted, the optimization design of the transonic drag reduction for the two different aspect ratio of the flying wing configurations is carried out. The results of the optimization design are as follows: Under the condition of satisfying the aerodynamic and geometric constraints, the transonic shock resistance of the flying wing is weakened to a great extent, which proves that the developed method has high optimization efficiency and good optimization effect in the multi-objective multi-constraint aerodynamic design of the flying wing.

A Novel Airfoil Design Method and its Application to the Optimization Design of a 3-Stage Transonic Compressor

2021 ◽  
Author(s):  
Xiaochen Wang ◽  
Xiaodong Ren ◽  
Xuesong Li ◽  
Hong Wu ◽  
Chunwei Gu
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Geometrical Parameters ◽  
Optimized Design ◽  
Suction Surface ◽  
Transonic Compressor ◽  
The Third ◽  
Third Stage ◽  
Proper Design ◽  
Industrial Gas Turbine

Abstract In this paper, a novel airfoil design method is proposed by introducing multiple physical characteristics to the process of parameterization. The new design method is to operate the camber and thickness distributions in a way that the chordwise mapping information is adjusted without using local geometrical parameters. A proper design space is expected to be constructed, in which the laws of optimization can be simply transmitted from a single airfoil to the whole blade and even stages. The capability of the method is firstly validated in the Pareto optimization of a 2D compressor airfoil, and then specialized for the optimization of a rotor in a 3-stage transonic compressor. The 3-stage transonic compressor studied in this paper is representative of the inlet stages of an industrial gas turbine, and the shock structure of the third rotor (R3) presents the peak strength near the mid span. The optimized design reduces the peak Mach number on the suction surface, and increases the efficiency of the third stage and the whole compressor by nearly 1% and 0.3% respectively. The mechanism of the loss optimization is analyzed in detail.

Study on Topology Optimization Design of Steel Frame Bracing System Based on Discrete Model

2012 ◽  
Vol 446-449 ◽  
pp. 3191-3196 ◽  
Author(s):  
Jia Nian He ◽  
Zhan Wang
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Reference Value ◽  
Frame Structure ◽  
Discrete Topology ◽  
Math Model ◽  
Rigid Frame ◽  
Rigid Connection ◽  
Design Plan ◽  
Bracing System

Comparing with the frame structure without any aseismic members, bracing-frame is a better form for the aseismic frame structure. But the form of bracing –frame is determined by the engineering experience. The best design plan can’t be determined using the traditional design method. In order to find the optimal result for the bracing –frame structure, the bracing system topology and the semi-rigid connection topology was considered in this paper. And the optimal model was built based on on discrete topology math model. And the dominant winning role for genetic algorithm was adopted due to a large number of non-linear problems. Through the optimal design for active semi-rigid frame bracing system based on discrete topology method, we can get the best design plan in whole structure system, which have better engineering significance and reference value usually.

scholarly journals Multiobjective Optimization Design and Performance Prediction of Centrifugal Pump Based on Orthogonal Test

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Yuqin Wang ◽  
Xinwang Huo
Keyword(s):  
Multiobjective Optimization ◽  
Centrifugal Pump ◽  
Optimization Design ◽  
Maximum Velocity ◽  
Internal Flow ◽  
Orthogonal Test ◽  
Weight Matrix ◽  
Wake Flow ◽  
Range Analysis ◽  
Shaft Power

In order to improve the hydraulic performance of the centrifugal pump, based on the original model, the optimization mathematical model with the four indexes head, efficiency, shaft power, and pump net positive suction head as objective function was established, and the multiobjective optimization design of the centrifugal pump was carried out by orthogonal test. Based on the L1644 orthogonal table, 16 sets of orthogonal test schemes were made by selecting the four parameters impeller outlet width, blade inlet angle, blade outlet angle, and cape angle; the flow field numerical simulation was carried out by computational fluid dynamics technique; and the influence order of geometric parameters on optimization indexes was obtained by range analysis. The weight of each test factor on the optimization index was calculated by weight matrix, and a set of optimal schemes was obtained. Based on the external characteristic experimental bench of the IH 65-60-190 chemical centrifugal pump, the simulation values and test values of the prototype pump and the optimization pump were obtained under different working conditions. Under the rated flow, the head was reduced by 17.00%, the efficiency was increased by 9.14%, the shaft power was reduced by 21.50%, the pump net positive suction head was reduced by 16.69%, the curve hump was eliminated, the performance of centrifugal pump was improved, and the feasibility of the weight matrix optimization method was verified. The particle image velocimetry measurement system was used to measure the relative velocity of the internal media in the centrifugal pump. The results showed that the optimization pump had no obvious “jet-wake” flow structure, its maximum velocity was less than the prototype pump, the area of low-speed zone was larger than the prototype pump, the efficiency of the centrifugal pump was improved, and the shaft power and pump net positive suction head were reduced. The reason of the head decrease was analyzed from the internal flow situation, and the accuracy of the design optimization process was proved.

scholarly journals Study on the optimal design of volume fracturing for shale gas based on evaluating the fracturing effect—A case study on the Zhao Tong shale gas demonstration zone in Sichuan, China

2021 ◽  
Vol 11 (4) ◽  
pp. 1705-1714
Author(s):  
Yongxue Lin ◽  
Shanyong Liu ◽  
Shuyang Gao ◽  
Yuan Yuan ◽  
Jia Wang ◽  
...  
Keyword(s):  
Optimal Design ◽  
Shale Gas ◽  
Optimization Design ◽  
Design Method ◽  
Microseismic Monitoring ◽  
Liquid Volume ◽  
Hydraulic Fractures ◽  
Optimized Design ◽  
Gas Wells ◽  
Volume Fracturing

AbstractHydraulic fracturing is the key technology in the development of shale gas reservoirs, and it mainly adopts volume fracturing technology to communicate hydraulic fractures with natural fractures to increase the drainage area. In view of the difficulty in characterizing the complex fractures created by multistaged fracturing in horizontal shale gas wells and the immaturity of fracturing optimization design methods, this study first evaluated the stimulation effect of fracturing technology based on treatment data and microseismic data. Then, the fracture characteristics after frac were considered, and a post-frac simulation was studied based on the discrete fracture network (DFN) model and the microseismic monitoring data as constraints. Finally, from the simulation results, an optimal design method of volume fracturing for shale gas was proposed based on the evaluation of the frac effects. The National Shale Gas Demonstration Zone in Zhaotong, Sichuan Basin was used as an example to study the optimal frac design of shale gas wells. The results show that (1) after optimizing the design, the optimal interval range is 50–70 m, the liquid volume of a single stage is 1800–2200 m3, the amount of sand is 80 m~120 t, and the slurry rate is 10–12 m3/min. (2) Two different frac design schemes were implemented in two wells on the same platform, and the production of the optimized design scheme was 14.7% greater than the original scheme. Therefore, the frac optimization design based on evaluating the fracturing effect can better guide the development of subsequent shale gas wells in this area.

scholarly journals Design Method of B-Axis Components of Water Chamber Head Turning and Milling Machining Center

2015 ◽  
Vol 9 (1) ◽  
pp. 226-233 ◽  
Author(s):  
Zheng Minli ◽  
Cheng Fenglan ◽  
Zhao Jiaxue ◽  
Sun Shouzheng ◽  
Jiang Chongmin
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Equal Mass ◽  
Joint Surface ◽  
Machining Accuracy ◽  
Analysis Model ◽  
Head Turning ◽  
Design Scheme ◽  
Machining Center ◽  
Water Chamber

Aiming at the demands of nuclear water chamber head’s multi-inclined holes and ramps in boring and milling, based on design requirements of special turning and milling machining center, B-axis structural design is put forward, research on deformation characteristics of ram components under different swing angle, propose the control methods of deformation and errors. Adopt modeling method of equal mass, construction of deformation and displacement analysis model of B-axis components, explore formation reason of maximum gap between components’ joint surface, form optimization design scheme of rotation structure of B-axis components. Trial-produce prototype of B-axis components, make experiment of trial cut water chamber head in turning and milling machining center, utilize test results of part's machining quality, verify unloading effects and machining accuracy of design scheme of B-axis components has been verified.

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