scholarly journals Integrated Topology Optimization of Structure/Vibration Control for Piezoelectric Cylindrical Shell Based on the Genetic Algorithm

2015 ◽  
Vol 2015 ◽  
pp. 1-10
Author(s):  
Jianjun He ◽  
Xiangzi Chen
Keyword(s):  
Genetic Algorithm ◽  
Cylindrical Shell ◽  
Control System ◽  
Shell Structure ◽  
Optimization Design ◽  
Optimal Structure ◽  
Topological Optimization ◽  
Couple Mode ◽  
Structure Control ◽  
Structure Topology

A hybrid optimization strategy for integrated topological optimization design of piezoelectric cylindrical flat shell structure is proposed. The method combines the genetic algorithm (GA) and linear-quadratic-regulator (LQR) theory to optimize the performance of coupling structure/control system. The GA is used to choose the optimal structure topology and number and placements of actuators and control parameters; meanwhile, the LQR is used to design control system to suppress vibration of optimal structure under sinusoidal excitation, which is based on the couple-mode space control. In addition, the mathematical morphology operators are used for repairs of disconnected structure topology. The results of numerical simulation and computations show that the proposed method is effective and feasible, with good performance for the optimal and coupling piezoelectric cylindrical shell structure/control system.

Vibration Characteristics and Optimization of Variable Cross-Section Cylindrical Shell Structure under Multi-Point Excitation

2013 ◽  
Vol 372 ◽  
pp. 547-551
Author(s):  
Lin Chen ◽  
Xiao Zhong Xie ◽  
Zhuo Li ◽  
Fu Zhen Pang
Keyword(s):  
Cylindrical Shell ◽  
Cross Section ◽  
Shell Structure ◽  
Optimization Design ◽  
Acoustic Radiation ◽  
Variable Cross Section ◽  
Low Noise ◽  
Structural Vibration ◽  
Variable Cross ◽  
Transfer Path

According to the loading feature and the structure form, a gear reducer box can be simplified to a variable cross-section cylindrical shell structure excited by multipoint force. Meanwhile, a theoretical model is developed to analyze the structural vibration and acoustic characteristics and to find out the dominant component of vibration. Then, the influence of different parameters, such as, the local structure thickness, constrained damping layer and the insulation layer on acoustic radiation performance of the variable cross-section cylindrical shell structure are investigated by numerical calculation. Finally, an optimization design scheme of a low-noise structure is proposed because of the two aspects about noise source and noise transfer path.

Structural Topology Optimization for Improvements of some Shell Structures' Rib Design Process

2013 ◽  
Vol 385-386 ◽  
pp. 1927-1932
Author(s):  
Jian Xiang Sun ◽  
Ye Yang ◽  
Jing Yi Tian
Keyword(s):  
Topology Optimization ◽  
Shell Structure ◽  
Optimization Design ◽  
Fe Simulation ◽  
Design Method ◽  
Topological Optimization ◽  
Optimal Topology ◽  
Structural Topology ◽  
Validity And Reliability ◽  
The Continuum

In order to overcome the shortcoming of traditional mathematical model of topology optimization which aims to the continuum structures, a new implementation combined with TOSCA Structure software is presented. To examine the accuracy of optimal topology of this kind of structural, the programming scheme for the conceptual design of one shell structure using topological optimization approaches is set firstly, then build up a new topology optimization design method of the shell structure rib model. Through the FE simulation calculations from Project 1 to Project 4, different improvement results of maximum displacements are obtained. These results demonstrate the validity and reliability of the method.

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