Design theory and optimization method of a hybrid composite rotor for an ultracentrifuge

2013 ◽  
Vol 59 ◽  
pp. 78-95 ◽  
Author(s):  
Hak Gu Lee ◽  
Jisang Park ◽  
Ji Hoon Kim
Keyword(s):  
Hybrid Composite ◽  
Design Theory ◽  
Optimization Method

Experimental investigation, modeling and optimization study on the mechanical properties of B4Cp/MWCNT/epoxy multi-scale hybrid composite

2020 ◽  
pp. 096739112097118
Author(s):  
Mustafa Taşyürek
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Process Parameters ◽  
Hybrid Composite ◽  
Optimization Method ◽  
High Rate ◽  
Dominant Factor ◽  
Mechanical And Thermal Properties ◽  
Multi Scale ◽  
The Matrix

In this study, process parameters and mechanical properties of the multi-scale composite were investigated experimentally and predictably. Multi-scale material includes boron carbide particles and multi walled carbon nanotubes (MWCNTs) in the epoxy-based matrix. Both reinforcements were reinforced into the matrix with various rates simultaneously. Average three tensile strength and hardness values were determined. The tensile strength and hardness were enhanced thanks to high rate of B4C usage up to 54.09% and 2.54%, respectively. The microstructure of the hybrid composite was investigated by Scanning Electron Microscopy. Also, Fourier Transform Infrared Spectroscopy was used to interpret spectral bands. The experimental data were analyzed using optimization method. Optimal process parameters for tensile strength and interfacial properties were determined. The Analysis of Variance (ANOVA) was used to obtain most significant factor and optimum levels of parameters. Finally, it was observed that B4C ratio is the most dominant factor affecting the mechanical and thermal properties.

An Optimization Method of Multiple Tuned Mass Damper Systems and Application to Bridge With Moving Car

2016 ◽  
Author(s):  
Thuan Nguyen ◽  
Nanako Miura ◽  
Akira Sone
Keyword(s):  
Control System ◽  
Optimal Design ◽  
Vibration Control ◽  
Design Theory ◽  
Seismic Loading ◽  
Optimization Method ◽  
Tuned Mass Damper ◽  
Tuned Mass Dampers ◽  
High Rise ◽  
Mass Damper

Tuned mass damper (TMD) device has been a popular vibration control system for moderns as high-rise building, bridge to suppress excessive vibration due to environment or human loading. Moreover, multiple tuned mass dampers have received much attention in the researched. An optimal design theory for bridge implemented with multiple TMD devices is proposed in this paper. The proposed method chooses the objective function with the constraints on the peaks which are at the same heights over frequency ranges of interest. This proposed method successfully reduces vibration of bridge traveled by a car. In a future study, we will extend the optimal design theory for the cases with more than one car and the bridge under seismic loading.

Harmony Search Algorithm and its Application to Product Module Identification

2011 ◽  
Vol 225-226 ◽  
pp. 1100-1104 ◽  
Author(s):  
Quan Shan ◽  
Yan Chen
Keyword(s):  
Design Theory ◽  
Simulated Annealing Algorithm ◽  
Search Algorithm ◽  
Harmony Search ◽  
Optimization Method ◽  
Harmony Search Algorithm ◽  
Optimization Approach ◽  
Module Identification ◽  
Optimization Function ◽  
Axiomatic Design Theory

Point to product module identification, a new optimization method is proposed in this paper. This approach uses the harmony search (HS) algorithm with the synthesis design structure matrix (DSM). The synthesis DSM thinks a series of property correlations facing the product lifecycle, such as function, geometer, physics, assistant and so on. An optimization function for module identification, based on the axiomatic design theory, is established. This optimization approach, which used HS algorithm, is tested several times and compared with other classical algorithms, such as simulated annealing algorithm (SAA) and genetic algorithm (GA). The result demonstrates the feasibility of the proposed approaches.

Study on Reliability-Based Optimal Design of Multi-Stage Planetary Gear Train in Wind Power Yaw Reducer

2012 ◽  
Vol 215-216 ◽  
pp. 867-872
Author(s):  
Wu Yong Wan ◽  
Suo Huai Zhang ◽  
Xu Meng
Keyword(s):  
Design Theory ◽  
Optimization Design ◽  
High Reliability ◽  
Planetary Gear ◽  
Optimization Method ◽  
Gear Train ◽  
Reliability Optimization ◽  
Original Design ◽  
Ratio Distribution ◽  
Multi Stage

Based on reliability optimization design theory and sub step optimization method, the mathematical models of transmission ratio distribution and gears’ parameters are established, respectively. In the model, the normal module, pressure angle, the teeth width, teeth number and modification coefficient of the gears are taken as design variables, while the volumes of the yaw reducer and single stage transmission are taken as the objective functions. Then the complex optimal problems are solved using two heuristic optimization algorithms. Compared to the original design, the volume of the yaw reducer decreased by about 3.5% under the premise of maintaining the strength requirements and ensuring high reliability, which supplies an effective approach to further developing the reliability optimization design of multi-stage planetary gear systems.

scholarly journals Structural Optimization of Steel Cantilever Used in Concrete Box Girder Bridge Widening

2015 ◽  
Vol 2015 ◽  
pp. 1-14
Author(s):  
Qian Wang ◽  
Wen-liang Qiu ◽  
Sheng-li Xu
Keyword(s):  
Structural Optimization ◽  
Design Theory ◽  
Optimization Method ◽  
Box Girder ◽  
Optimal Position ◽  
Analysis Process ◽  
Concrete Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge

The structural optimization method of steel cantilever used in concrete box girder bridge widening is illustrated in this paper. The structural optimization method of steel cantilever incorporates the conceptual layout design of steel cantilever beam based on the topological theory and the determination of the optimal location of the transverse external prestressed tendons which connect the steel cantilever and the box girder. The optimal design theory and the analysis process are illustrated. The mechanical model for the prestressed steel cantilever is built and the analytical expression of the optimal position of the transverse external tendon is deduced. At last the effectiveness of this method is demonstrated by the design of steel cantilevers which are used to widen an existing bridge.

Frequency Reliability Robust Optimization for Rotor System

2012 ◽  
Vol 479-481 ◽  
pp. 1023-1026
Author(s):  
Chang Qing Su ◽  
Le Xin Li
Keyword(s):  
Robust Optimization ◽  
Robust Design ◽  
Design Theory ◽  
Optimization Design ◽  
Design Method ◽  
Optimization Method ◽  
Rotor System ◽  
Reliability Design ◽  
Reliability Sensitivity ◽  
Reliability Robust Design

The material properties and geometry of rotor system are random parameters because of the manufacturing environment, manufacturing and installation errors and other factors. Based on the reliability design theory, the reliability sensitivity technique and the robust design method, the frequency reliability robust optimization method of rotor system is extensively discussed. The frequency reliability sensitivity is added to the reliability-based optimization design model of rotor system. The frequency reliability robust design is described as a multi-objection optimization. The method presented provided the theoretic basis for the reliability robust design of the rotor system. A numerical example demonstrated that the proposed method is effective.

Design Theory

1985 ◽  
Author(s):  
D. R. Hughes ◽  
F. Piper
Keyword(s):  
Design Theory
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